<?php

use MultiLanguageManagement\MultiLanguage;
use REDCap\Context;

/**
 * SURVEY Class
 * Contains methods used with regard to surveys
 */
class Survey
{
	// Time period after which survey short codes will expire
	const SHORT_CODE_EXPIRE = 60; // minutes

	// Character length of survey short codes
	const SHORT_CODE_LENGTH = 5;

	// Character length of survey access codes
	const ACCESS_CODE_LENGTH = 9;

	// Character length of numeral survey access codes
	const ACCESS_CODE_NUMERAL_LENGTH = 10;

	// Character to prepend to numeral survey access codes to denote for REDCap to call them back
	const PREPEND_ACCESS_CODE_NUMERAL = "V";

	// Number of signature fields usable by e-Consent Framework
	const numEconsentSignatureFields = 5;

    // Is this a non-existing record on a public survey? (used only on public survey pages)
    public static $nonExistingRecordPublicSurvey = false;

	// Field to capture PID for custom project status transition surveys
	public static $pidField = 'project_id';

	// Return array of form_name and survey response status (0=partial,2=complete)
	// for a given project-record-event. $record may be a single record name or array of record names.
	public static function getResponseStatus($project_id, $record=null, $event_id=null, $returnCompletionTimestamp=false)
	{
		$surveyResponses = array();
		$sql = "select r.record, p.event_id, s.form_name, r.completion_time,
				if(r.completion_time is null,0,2) as survey_complete, r.instance
				from redcap_surveys s, redcap_surveys_participants p, redcap_surveys_response r
				where s.survey_id = p.survey_id and p.participant_id = r.participant_id
				and s.project_id = $project_id and r.first_submit_time is not null";
		if ($record != null && is_array($record)) {
			$sql .= " and r.record in (".prep_implode($record).")";
		} elseif ($record != null) {
			$sql .= " and r.record = '".db_escape($record)."'";
		}
		if (is_numeric($event_id)) 	$sql .= " and p.event_id = $event_id";
		$sql .= " order by survey_complete";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$surveyResponses[$row['record']][$row['event_id']][$row['form_name']][$row['instance']] 
				= ($returnCompletionTimestamp ? $row['completion_time'] : $row['survey_complete']);
		}
		return $surveyResponses;
	}


	// Survey Notifications: Return array of surveys/users with attributes regarding email notifications for survey responses
	public static function getSurveyNotificationsList()
	{
		// First get list of all project users to fill default values for array
		$endSurveyNotify = array();
		$sql = "select if(u.ui_id is null,0,1) as hasEmail, u.user_email as email1, u.user_firstname, u.user_lastname,
				if (u.email2_verify_code is null, u.user_email2, null) as email2,
				if (u.email3_verify_code is null, u.user_email3, null) as email3,
				lower(r.username) as username from redcap_user_rights r
				left outer join redcap_user_information u on u.username = r.username
				where r.project_id = ".PROJECT_ID." order by lower(r.username)";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			// where 0 is default value for hasEmail
			$endSurveyNotify[$row['username']] = array('surveys'=>array(), 'hasEmail'=>$row['hasEmail'], 'email1'=>$row['email1'],
													   'email2'=>$row['email2'], 'email3'=>$row['email3'],
													   'name'=>label_decode($row['user_firstname'] == '' ? '' : trim("{$row['user_firstname']} {$row['user_lastname']}")) );
		}
		// Get list of users who have and have not been set up for survey notification via email
		$sql = "select lower(u.username) as username, a.survey_id, a.action_response
				from redcap_actions a, redcap_user_information u, redcap_user_rights r
				where a.project_id = ".PROJECT_ID." and r.project_id = a.project_id 
				and r.username = u.username and a.action_trigger = 'ENDOFSURVEY'
				and a.action_response in ('EMAIL_PRIMARY', 'EMAIL_SECONDARY', 'EMAIL_TERTIARY')
				and u.ui_id = a.recipient_id order by u.username";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			$email_acct = ($row['action_response'] == 'EMAIL_TERTIARY' ? 3 : ($row['action_response'] == 'EMAIL_SECONDARY' ? 2 : 1));
			$endSurveyNotify[$row['username']]['surveys'][$row['survey_id']] = $email_acct;
		}
		// Return array
		return $endSurveyNotify;
	}


	// Return boolean regarding if Survey Notifications are enabled
	public static function surveyNotificationsEnabled()
	{
		// Get list of users who have and have not been set up for survey notification via email
		$sql = "select 1 from redcap_actions where project_id = ".PROJECT_ID." and action_trigger = 'ENDOFSURVEY'
				and action_response in ('EMAIL_PRIMARY', 'EMAIL_SECONDARY', 'EMAIL_TERTIARY') limit 1";
		$q = db_query($sql);
		// Return boolean
		return (db_num_rows($q) > 0);
	}

    /**
     * Given a form name, checks whether this form is enabled as survey, has pagination enabled, and has more than one page.
     *      If a multipage survey then returns number of survey pages.
     * @param $form_name
     * @return int
     */
    public static function isMultiPageSurveyReturnCount($form_name)
    {
        global $Proj, $surveys_enabled;
        if (!$surveys_enabled) return 0;
        $hasPaginationEnabled = false;
        foreach ($Proj->surveys as $surveyId => $surveySettings) {
            if ($surveySettings['form_name'] === $form_name && $surveySettings['question_by_section'] === "1") {
                $hasPaginationEnabled = true;
                break;
            }
        }
        $reservedLabel = \Form::FORM_STATUS_SECTION_HEADER_LABEL;
        // Get number of sections defined in the instrument
        $sql = "select COUNT(*) from redcap_metadata where project_id = '".$Proj->getId()."' and form_name = '".$form_name."'
				and element_preceding_header != '".$reservedLabel."' and element_preceding_header IS NOT NULL";
        $q = db_query($sql);
        $count = db_result($q, 0);
        if ($hasPaginationEnabled && $count > 0) {
            return $count + 1; // if there are N section headers, then this means there are N+1 sections
        }
        return 0;
    }


	// Return boolean if Survey Queue is enabled for at least one instrument in this project
	public static function surveyQueueEnabled($project_id=null, $ignoreInactiveSurveys=true)
	{
		if (!is_numeric($project_id)) $project_id = PROJECT_ID;
		if (!is_numeric($project_id)) return false;
		$Proj = new Project($project_id);
		// Order by event then by form order
		if (!$Proj->longitudinal) {
			$sql = "select count(1) from redcap_surveys_queue q, redcap_surveys s, redcap_metadata m, redcap_events_metadata e,
					redcap_events_arms a where s.survey_id = q.survey_id and s.project_id = ".$Proj->project_id." and m.project_id = s.project_id
					and s.form_name = m.form_name and q.event_id = e.event_id and e.arm_id = a.arm_id and q.active = 1";
		} else {
			$sql = "select count(1) from redcap_surveys_queue q, redcap_surveys s, redcap_metadata m, redcap_events_metadata e,
					redcap_events_arms a, redcap_events_forms f where s.survey_id = q.survey_id and s.project_id = ".$Proj->project_id." and m.project_id = s.project_id
					and s.form_name = m.form_name and q.event_id = e.event_id and e.arm_id = a.arm_id and q.active = 1
					and f.event_id = e.event_id and f.form_name = s.form_name";
		}
        if ($ignoreInactiveSurveys) $sql .= " and s.survey_enabled = 1";
		$q = db_query($sql);
		return (db_result($q, 0) > 0);
	}


	// Return the complete Survey Queue prescription for this project
	public static function getProjectSurveyQueue($ignoreInactivesInQueue=true, $ignoreInactiveSurveys=true, $project_id=null)
	{
        // Get $Proj object
        $Proj = new Project($project_id);
		$project_queue = array();
        if (!empty($Proj->surveys)) {
            // Order by event then by form order
            $sql = "select distinct q.* from redcap_surveys_queue q, redcap_surveys s, redcap_metadata m, redcap_events_metadata e,
                    redcap_events_arms a where s.survey_id = q.survey_id and s.project_id = " . $Proj->project_id . " and m.project_id = s.project_id
                    and s.form_name = m.form_name and q.event_id = e.event_id and e.arm_id = a.arm_id";
            if ($ignoreInactiveSurveys) $sql .= " and s.survey_enabled = 1";
            if ($ignoreInactivesInQueue) $sql .= " and q.active = 1";
            $sql .= " order by a.arm_num, e.day_offset, e.descrip, m.field_order";
            $q = db_query($sql);
            if (db_num_rows($q) > 0) {
                while ($row = db_fetch_assoc($q)) {
                    $survey_id = $row['survey_id'];
                    $event_id = $row['event_id'];
                    unset($row['survey_id'], $row['event_id']);
                    $form = $Proj->surveys[$survey_id]['form_name'];
                    if ($Proj->longitudinal && (!isset($Proj->eventsForms[$event_id]) || !is_array($Proj->eventsForms[$event_id]) || !in_array($form, $Proj->eventsForms[$event_id]))) {
                        continue;
                    }
                    if ($Proj->project['survey_queue_hide']) $row['auto_start'] = 1;
                    $project_queue[$survey_id][$event_id] = $row;
                }
            }
        }
		return $project_queue;
	}


	// Return the Survey Queue of completed/incomplete surveys for a given record.
	// If $returnTrueIfOneOrMoreItems is set to TRUE, then return boolean if one or more items exist in this record's queue.
	public static function getSurveyQueueForRecord($record, $returnTrueIfOneOrMoreItems=false, $project_id=null)
	{
        // Get $Proj object
        $Proj = new Project($project_id);
		// Add queue itmes for record to array
		$record_queue = array();
		// First, get the project's survey queue and loop to see how many are applicable for this record
		$project_queue = self::getProjectSurveyQueue(true, true, $Proj->project_id);

		// Collect all survey/events where surveys have been completed for this record
		$completedSurveyEvents = array();
		$sql = "select p.event_id, p.survey_id, r.instance, r.completion_time from redcap_surveys_participants p, redcap_surveys_response r
				where r.participant_id = p.participant_id and p.survey_id in (".prep_implode(array_keys($Proj->surveys)).")
				and p.event_id in (".prep_implode(array_keys($Proj->eventInfo)).") and r.record = '" . db_escape($record) . "'";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			// If completion time is not null, then add
			if ($row['completion_time'] != ''
				// If not a completed survey, but is a completed form, then add (this replicates ASI behavior for checking form status)
				|| SurveyScheduler::isFormStatusCompleted($row['survey_id'], $row['event_id'], $record, $row['instance'])
			) {
				$completedSurveyEvents[$row['survey_id']][$row['event_id']][$row['instance']] = true;
			}
		}

		// GET DATA for all fields used in Survey Queue conditional logic (for all queue items)
		$fields = array($Proj->table_pk);
		$events = ($Proj->longitudinal) ? array() : array($Proj->firstEventId);
		// Loop through project queue for this record to get conditional logic used
		foreach ($project_queue as $survey_id=>$sattr) {
			foreach ($sattr as $event_id=>$queueItem) {
				if ($queueItem['condition_logic'] === null || trim($queueItem['condition_logic']) == '') continue;
				// Loop through fields used in the logic. Also, parse out any unique event names, if applicable
				foreach (array_keys(getBracketedFields($queueItem['condition_logic'], true, true, false)) as $this_field)
				{
					// Check if has dot (i.e. has event name included)
					if (strpos($this_field, ".") !== false) {
						list ($this_event_name, $this_field) = explode(".", $this_field, 2);
						$events[] = $Proj->getEventIdUsingUniqueEventName($this_event_name);
					}
					// Add field to array
					$fields[] = $this_field;
				}
			}
		}
		// Add form status fields for Repeating Instrument surveys
		foreach ($Proj->getRepeatingFormsEvents() as $this_event_id=>$repeatForms) {
			if (!is_array($repeatForms)) continue;
			$events[] = $this_event_id;
			foreach (array_keys($repeatForms) as $thisRepeatForm) {
				$fields[] = $thisRepeatForm . "_complete";
			}
		}
		// Set params for getData
		$events = array_unique($events);
		$fields = array_unique($fields);
		// Retrieve data from data table since $record_data array was not passed as parameter
		$getDataParams = [
			'project_id' => $Proj->project_id,
			'records' => $record,
			'fields' => $fields,
			'events' => $events,
			'returnEmptyEvents' => true,
			'decimalCharacter' => '.',
			'returnBlankForGrayFormStatus' => true
		];
		$record_data = Records::getData($getDataParams);
		if (empty($record_data[$record])) $record_data = null;
		
		// Loop through project queue for this record and reconfigure the $project_queue array
		$project_queue2 = array();
		foreach ($project_queue as $survey_id=>$sattr) {
			foreach ($sattr as $event_id=>$queueItem) {
				$project_queue2[$event_id][$survey_id] = $queueItem;
			}
			unset($project_queue[$survey_id]);
		}
		$project_queue = $project_queue2;
		unset($project_queue2);

		$eventInfoKeys = array_keys($Proj->eventInfo);
		
		// Loop through project queue for this record
		foreach ($project_queue as $event_id=>$sattr) {
			// Loop through events
			foreach ($sattr as $survey_id=>$queueItem) {
				// Get survey's form_name
				$form_name = $Proj->surveys[$survey_id]['form_name'];
				// Set instance array depending on how many instances exist for this record
				$instances = array(1);
				if (isset($record_data[$record]['repeat_instances'][$event_id][$form_name])) {
					$instances = array_merge($instances, array_keys($record_data[$record]['repeat_instances'][$event_id][$form_name]));
				}
				// If this form is not designated for this event, then go to next loop
				if (!(isset($Proj->eventsForms[$event_id]) && is_array($Proj->eventsForms[$event_id]) && in_array($form_name, $Proj->eventsForms[$event_id]))) continue;
				// Loop through all instances
				foreach ($instances as $instance) {				
					// Should this item be displayed in the record's queue?
					$displayInQueue = self::checkConditionsOfRecordToDisplayInQueue($Proj->project_id, $record, $queueItem, $completedSurveyEvents, $record_data, $event_id, $form_name, $instance,
                                                ($Proj->isRepeatingForm($event_id, $form_name) ? $form_name : null));
					// Determine if participant has completed this survey-event already
					$completedSurvey = (isset($completedSurveyEvents[$survey_id][$event_id][$instance]));
					// Check response limit (if enabled) - skip survey/event in queue if hit limit already
					if ($displayInQueue && !$completedSurvey && $Proj->surveys[$survey_id]['response_limit'] > 0 && Survey::reachedResponseLimit($Proj->project_id, $survey_id, $event_id)) {
						$displayInQueue = false;
					}
					// If will be displayed in queue, get their survey link hash and then add to array
					if ($displayInQueue) {
						// If set flag to return boolean, then stop here and return TRUE
						if ($returnTrueIfOneOrMoreItems) return true;
						// Get the survey hash for this survey-event-record
						list ($participant_id, $hash) = self::getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id, false, $instance);
						// Set event number and form number for ordering purposes
                        $form_number = $Proj->forms[$form_name]['form_number'];
                        $event_number = array_search($event_id, $eventInfoKeys) + 1;
						// Add to array
						$record_queue["$event_number-$form_number-$survey_id-$event_id-$instance"] = array(
							'survey_id'=>$survey_id, 'event_id'=>$event_id, 'instance'=>$instance, 'title'=>$Proj->surveys[$survey_id]['title'],
							'participant_id'=>$participant_id, 'hash'=>$hash, 'auto_start'=>$queueItem['auto_start'], 'completed'=>($completedSurvey ? 1 : 0)
						);
					}
				}
			}
		}

        // For longitudinal projects, ensure the queue items are in correct order (by event, then by instrument)
        if ($Proj->longitudinal) {
            // Sort by event, then instrument
            natcaseksort($record_queue);
            // Now fix the array keys back
            $record_queue2 = array();
            foreach ($record_queue as $key=>$attr) {
                list ($a, $b, $c, $d, $e) = explode("-", $key);
                $record_queue2["$c-$d-$e"] = $attr;
                unset($record_queue[$key]);
            }
            $record_queue = $record_queue2;
            unset($record_queue2);
        }
		/* 
		// Loop through all surveys and add to record's queue if a survey has already been completed
		$record_queue_all = array();
		// Loop through all arms
		foreach ($Proj->events as $arm_num=>$attr) {
			// Loop through each event in this arm
			foreach (array_keys($attr['events']) as $event_id) {
				// Loop through forms designated for this event
				foreach ($Proj->eventsForms[$event_id] as $form_name) {
					// If form is enabled as a survey
					if (isset($Proj->forms[$form_name]['survey_id'])) {
						// Get survey_id
						$survey_id = $Proj->forms[$form_name]['survey_id'];
						// Set instance array depending on how many instances exist for this record
						$instances = array(1);
						if (isset($record_data[$record]['repeat_instances'][$event_id][$form_name])) {
							$instances = array_merge($instances, array_keys($record_data[$record]['repeat_instances'][$event_id][$form_name]));
						}
						// Loop through all instances
						foreach ($instances as $instance) {
							// If we have already saved this survey in our record_queue, then just copy the existing attributes
							if (isset($record_queue["$survey_id-$event_id-$instance"])) {
								// Add to array
								$record_queue_all["$survey_id-$event_id-$instance"] = $record_queue["$survey_id-$event_id-$instance"];
							} elseif (isset($completedSurveyEvents[$survey_id][$event_id][$instance])) {
								// Check if survey was completed. Only add survey to queue if completed
								// Get the survey hash for this survey-event-record
								list ($participant_id, $hash) = self::getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id, false, $instance);
								// Prepend to array
								$record_queue_all["$survey_id-$event_id-$instance"] = array(
									'survey_id'=>$survey_id, 'event_id'=>$event_id, 'instance'=>$instance, 'title'=>$Proj->surveys[$survey_id]['title'],
									'participant_id'=>$participant_id, 'hash'=>$hash, 'auto_start'=>'0', 'completed'=>1
								);
							}
						}
					}
				}
			}
		}
		*/
		// If set flag to return boolean, then stop here
		if ($returnTrueIfOneOrMoreItems) return (!empty($record_queue));

		// Return the survey queue for this record
		return $record_queue;
	}


	// Display the Survey Queue of completed/incomplete surveys for a given record in HTML table format
	public static function displaySurveyQueueForRecord($record, $isSurveyAcknowledgement=false, $justCompletedSurvey=false)
	{
		global $Proj, $isAjax, $survey_queue_custom_text, $isMobileDevice, $survey_id, $survey_queue_hide, $survey_email_participant_field, $enable_participant_identifiers;
		// A list of survey ids that are included in the queue
		$surveys_in_queue = array();
		// Increase memory when processing large data arrays
		System::increaseMemory(2048);
		// Get survey queue items for this record
		$survey_queue_items = self::getSurveyQueueForRecord($record);
		if ($justCompletedSurvey) {
		    // If just finishing a survey, there's a chance that not all the rows have been populated yet in the surveys response table, which is
            // sometimes done inside getSurveyQueueForRecord(), so run getSurveyQueueForRecord() again in this situation to make sure we pick them all up.
			$survey_queue_items = self::getSurveyQueueForRecord($record);
		}
		// Obtain the survey queue hash for this record
		$survey_queue_hash = self::getRecordSurveyQueueHash($record);
		$survey_queue_link = APP_PATH_SURVEY_FULL . '?sq=' . $survey_queue_hash;
		// If empty, then return and display nothing
		if (empty($survey_queue_items)) return "";

        // Don't display any missing instances that were deleted
		foreach ($survey_queue_items as $key => $items) {
            if ($Proj->isRepeatingForm($items['event_id'], $Proj->surveys[$items['survey_id']]['form_name'])) {
                // Make sure there's at least one repeating instance for this record/event/survey
				$datasql = "SELECT count(instance) FROM ".\Records::getDataTable($Proj->project_id)." WHERE project_id = $Proj->project_id AND record = '".db_escape($record)."' 
                            AND event_id = {$items['event_id']} and field_name = '{$Proj->surveys[$items['survey_id']]['form_name']}_complete'";
				$q = db_query($datasql);
                $numInstances = db_result($q, 0);
                if ($numInstances > 0) {
					$datasql = "SELECT `instance` FROM ".\Records::getDataTable($Proj->project_id)." WHERE project_id = $Proj->project_id AND record = '" . db_escape($record) . "' 
                                AND event_id = {$items['event_id']} and field_name = '{$Proj->surveys[$items['survey_id']]['form_name']}_complete'";
					$datasql .= ($items['instance'] == '1') ? "AND instance is null" : "AND instance = '" . $items['instance'] . "'";
					$datasql .= " limit 1";
					$q = db_query($datasql);
					if (db_num_rows($q) == 0) {
						unset($survey_queue_items[$key]);
					}
				}
            }
        }

		// Obtain participant's email address, if we have one.
        // If the survey response status is "anonymous", then set $participant_email to blank to preserve anonymity of the participant
        $surveyEmailInvitationFields = $Proj->getSurveyEmailInvitationFields(true);
        $designatedEmailFieldEnabled = ($survey_email_participant_field != '' || isset($surveyEmailInvitationFields[$survey_id]));
        if (!$enable_participant_identifiers && !$designatedEmailFieldEnabled) {
            // Completely anonymous (do not display email)
            $participant_email = "";
        } else {
            // Get participant's email address
            $participant_emails_idents = self::getResponsesEmailsIdentifiers(array($record), $survey_id);
            foreach ($participant_emails_idents as $participant_id=>$pattr) {
                $participant_email = $pattr['email'];
            }
        }

		// AUTO-START: If enabled for the first incomplete survey in queue, then redirect there
		if ($isSurveyAcknowledgement || $survey_queue_hide) {
			// Loop through queue to find the first incomplete survey
			foreach ($survey_queue_items as $queueAttr) {
				// If already completed, or if a repeating instance, then skip to next item
				if ($queueAttr['completed'] > 0 || (isset($queueAttr['instance']) && $queueAttr['instance'] > 1)) continue;
				if ($queueAttr['auto_start']) {
					// If just completed the survey, then execute the redcap_survey_complete hook
					if ($justCompletedSurvey) {
						// REDCap Hook injection point: Pass project/record/survey attributes to method
						$group_id = (empty($Proj->groups)) ? null : Records::getRecordGroupId(PROJECT_ID, $record);
						if (!is_numeric($group_id)) $group_id = null;
						Hooks::call('redcap_survey_complete', array(PROJECT_ID, (is_numeric($_POST['__response_id__']) ? $record : null), $_GET['page'], $_GET['event_id'], $group_id, $_GET['s'], $_POST['__response_id__'], $_GET['instance']));
						Survey::outputCustomJavascriptProjectStatusPublicSurveyCompleted(PROJECT_ID, (is_numeric($_POST['__response_id__']) ? $record : null));
					}
					// Redirect to first incomplete survey in queue
					redirect(APP_PATH_SURVEY_FULL . '?s=' . $queueAttr['hash']);
				}
				// Stop looping if first incomplete survey does not have auto-start enabled
				break;
			}
		}

		// Return no html if queue is hidden and we've completed all surveys
        if ($survey_queue_hide) return '';

		// Get a count of the number of surveys in queue that have been completed already. If more than 4, then compact them.
		$numSurveysCompleted = 0;
		foreach ($survey_queue_items as $queueAttr) {
			if ($queueAttr['completed'] > 0) $numSurveysCompleted++;
		}
		// Collect all html as variable
		$html = "";
		$row_data = array();
		// Loop through items to display each as a row
		$isFirstIncompleteSurvey = true;
		$hideCompletedSurveys = ($numSurveysCompleted > 5);
		$num_survey_queue_items = count($survey_queue_items);
		$allSurveysCompleted = ($num_survey_queue_items == $numSurveysCompleted);
		$rowCounter = 1;
        $showAllSurveysCompletedText = true;
		$surveyCompleteIconText = 	RCView::img(array('src'=>'tick.png', 'style'=>'vertical-align:middle;')) .
									RCView::span(array('style'=>'font-weight:normal;vertical-align:middle;line-height:22px;font-size:12px;color:green;'), RCView::tt("survey_507"));
		$survey_queue_items = array_values($survey_queue_items); // Re-index the survey queue array so that they key is predictable		
		foreach ($survey_queue_items as $key=>$queueAttr)
		{
			// Gather some data for translation
			$translation_data = array(
				"event_id" => $queueAttr["event_id"],
			);
			// Get survey's form_name
			$form_name = $Proj->surveys[$queueAttr['survey_id']]['form_name'];
			// If this instrument is a repeating instrument
			$isRepeatingForm = $Proj->isRepeatingForm($queueAttr['event_id'], $form_name);
			// Get list of all instances for this repeating instrument
			$pipedLabel = "";
			if ($isRepeatingForm) {
				// CUSTOM FORM LABEL PIPING: Gather field names of all custom form labels (if any)
				$pipedFormLabels = RepeatInstance::getPipedCustomRepeatingFormLabels($record, $queueAttr['event_id'], $form_name);
				// Get pre-piped custom repeating form label
				$pre_piped_label = $Proj->RepeatingFormsEvents[$queueAttr['event_id']][$form_name];
				// Pipe any custom form labels
				if ($pre_piped_label != "" && isset($pipedFormLabels[$record][$queueAttr['instance']])) {
					$pipedLabel = ": " . $pipedFormLabels[$record][$queueAttr['instance']];
				}
				$translation_data["event-label"] = $pre_piped_label;
				$translation_data["instance"] = $queueAttr["instance"];
				$translation_data["form-label"] = $pipedFormLabels[$record][$queueAttr['instance']] ?? "";
			}
			// Set onclick action for link/button
			$onclick = ($isAjax) ? "window.open('".APP_PATH_SURVEY_FULL."?s={$queueAttr['hash']}','_blank');"
								 : "window.location.href = '".APP_PATH_SURVEY_FULL."?s={$queueAttr['hash']}';";
			// Set button text
			$rowClass = $title_append = '';
			if ($queueAttr['completed']) {
				// If completed and more than $maxSurveysCompletedHide are completed, then hide row
				$rowClass = ($hideCompletedSurveys) ? 'hidden' : '';
				// Set image and text
				$button = $surveyCompleteIconText;
				$title_style = 'color:#aaa;';
				// If this survey has Save&Return + Edit Completed Response setting enabled, display link to open existing response
				if ($Proj->surveys[$queueAttr['survey_id']]['save_and_return']
					&& $Proj->surveys[$queueAttr['survey_id']]['edit_completed_response'])
				{
                    // Hide the row if this is a repeating instrument
                    if (!$Proj->isRepeatingForm($queueAttr['event_id'], $form_name)) {
                        $rowClass = '';
                    }
                    // Display link to open existing response
					$title_append .= RCView::div(array('class'=>"opacity75 nowrap", 'onmouseover'=>"$(this).removeClass('opacity75');", 'onmouseout'=>"$(this).addClass('opacity75');", 'style'=>'float:right;margin:0 10px 0 20px;'),
										RCView::button(array('class'=>'btn btn-defaultrc btn-xs', 'style'=>'color:#000;background-color:#f0f0f0;', 'onclick'=>$onclick),
											RCView::i(array('class'=>'fas fa-pencil-alt', 'style'=>'top:2px;margin-right:5px;'), '') . 
											RCView::tt("data_entry_174")
										)
									);
				}
			} else {
				// Set button and text
				$button = RCView::button(array('class'=>'jqbuttonmed', 'style'=>'vertical-align:middle;', 'onclick'=>$onclick), RCView::tt("survey_504"));
				$title_style = '';
			}
			
			// If this instrument is a repeating instrument and is the last
			if ($isRepeatingForm && $Proj->surveys[$queueAttr['survey_id']]['repeat_survey_enabled']) {
				// See if the next queue item is a different event or different instrument
				if ($queueAttr['completed'] > 0 && (!isset($survey_queue_items[$key+1]) || (isset($survey_queue_items[$key+1])
						&& !($queueAttr['event_id'] == $survey_queue_items[$key+1]['event_id'] && $queueAttr['survey_id'] == $survey_queue_items[$key+1]['survey_id']))))
				{
					$rowClass = '';
					// Get the custom repeat btn text
					$repeat_survey_btn_text = $Proj->surveys[$queueAttr['survey_id']]['repeat_survey_btn_text'];
					// Get count of existing instances and find next instance number
					list ($instanceTotal, $instanceMax) = RepeatInstance::getRepeatFormInstanceMaxCount($record, $queueAttr['event_id'], $form_name, $Proj);
					// Get the next instance's survey url
					$repeatSurveyLink = REDCap::getSurveyLink($record, $form_name, $queueAttr['event_id'], $instanceMax + 1);
					// Add button to add a new instance
					$title_append .= RCView::div(array('class'=>"opacity75 nowrap", 'onmouseover'=>"$(this).removeClass('opacity75');", 'onmouseout'=>"$(this).addClass('opacity75');", 'style'=>'margin:5px 0 2px;'),
										RCView::button(array('class'=>'btn btn-defaultrc btn-xs', 'style'=>'color:#000;background-color:#f0f0f0;', 'onclick'=>"window.location.href='$repeatSurveyLink';"),
											RCView::span(array('class'=>'fas fa-plus', 'style'=>'top:2px;margin-right:5px;'), '') . 
											(trim($repeat_survey_btn_text) == '' ? RCView::tt("survey_1090") : RCView::span(array('data-mlm-sq'=>'survey-repeat_survey_btn_text','data-mlm-id'=>$queueAttr['survey_id']), RCView::escape($repeat_survey_btn_text)))
										)
									);
					 // If participants can add new instances at any time, then never show the text "All surveys in your queue have been completed!", which could be confusing
                    $showAllSurveysCompletedText = false;
				}
			}
			
			// Add extra row to allow participant to display all completed surveys
			if (!$queueAttr['completed'] && $hideCompletedSurveys && $isFirstIncompleteSurvey)
			{
				// Set flag so that this doesn't get used again
				$isFirstIncompleteSurvey = false;
				// Add extra row
				$row_data[] = 	array(
									RCView::div(array('class'=>"wrap", 'style'=>'font-weight:normal;padding:2px 0;'), $surveyCompleteIconText),
									RCView::div(array('class'=>"wrap", 'style'=>'font-weight:normal;line-height:22px;font-size:13px;color:#444;'),
                                        RCView::tt_i("survey_1352", [$numSurveysCompleted]) .
										RCView::a(array('href'=>'javascript:;', 'style'=>'margin-left:8px;font-size:11px;font-weight:normal;', 'onclick'=>"
											$(this).parents('tr:first').hide();
											$('table#table-survey_queue .hidden').removeClass('hidden').hide().show('fade');
										"),
											RCView::tt("survey_535")
										)
									)
								);
			}
			// If title is blank, then use the form name instead
			if ($queueAttr['title'] == "") {
				$queueAttr['title'] = $Proj->forms[$form_name]['menu'];
			}
			// Add this row's HTML
			$row_data[] = 	array(
								RCView::div(array('class'=>"wrap $rowClass", 'style'=>'padding:2px 0;'), $button),
								RCView::div(array(
									'class'=>"wrap $rowClass", 
									'style'=>$title_style.'padding:4px 0;font-size:13px;font-weight:bold;',
								),
									RCView::span(array(
											'data-mlm-sq'=>'survey-title', // needed for on-the-fly translation
											'data-mlm-id'=>$queueAttr['survey_id'],
										), 
										strip_tags($queueAttr['title'])
									) .
									(!$Proj->longitudinal ? '' :
										RCView::span(array('class'=>"wrap $rowClass", 'style'=>'font-weight:normal; padding:0 10px;'),
											"&ndash;"
										) .
										RCView::span(array(
											'class'=>"wrap $rowClass", 'style'=>'font-weight:normal;',
											'data-mlm-sq'=>'event-name', // needed for on-the-fly translation
											'data-mlm-id'=>$queueAttr['event_id']),
											RCView::escape($Proj->eventInfo[$queueAttr['event_id']]['name_ext'])
										)
									) .
									(!$Proj->isRepeatingForm($queueAttr['event_id'], $form_name) ? '' :
										RCView::span(array(
											'class'=>"wrap $rowClass", 'style'=>'color:#800000;'.$title_style.'font-weight:normal;padding:0 10px 0 3px;',
											'data-mlm-sq'=>'instance-label', // needed for on-the-fly translation
											'data-mlm-id'=>$queueAttr['instance']),
											"<span style='color:#999;margin:0 6px;'>&ndash;</span>#{$queueAttr['instance']}{$pipedLabel}"
										)
									)
								) .
								$title_append
							);
            // Add extra row to allow participant to display all completed surveys
            if ($allSurveysCompleted && $rowCounter == $num_survey_queue_items && $hideCompletedSurveys)
            {
                // Set flag so that this doesn't get used again
                $isFirstIncompleteSurvey = false;
                // Add extra row
                $row_data[] = 	array(
                    RCView::div(array('class'=>"wrap", 'style'=>'font-weight:normal;padding:2px 0;'), $surveyCompleteIconText),
                    RCView::div(array('class'=>"wrap", 'style'=>'font-weight:normal;line-height:22px;font-size:13px;color:#444;'),
                        RCView::span(array('style'=>'font-size:13px;color:green;font-weight:bold;'), RCView::tt("survey_536")) .
                        RCView::a(array('href'=>'javascript:;', 'style'=>'margin-left:8px;font-size:11px;font-weight:normal;', 'onclick'=>"
                                        $(this).parents('tr:first').hide();
                                        $('table#table-survey_queue .hidden').removeClass('hidden').hide().show('fade');
                                    "),
                            RCView::tt("survey_535")
                        )
                    )
                );
            }
			// Increment counter
			$rowCounter++;
			// Add survey id to array of survey ids (this is needed to later filter translations)
			$surveys_in_queue[$queueAttr["survey_id"]] = $translation_data;

		}
		// Custom survey queue text (invoke piping also) OR the default text
		$survey_queue_text = RCView::tt("survey_506") . RCView::br() . RCView::tt("survey_511");
		if ($survey_queue_custom_text != '') {
			$survey_queue_text = label_decode(Piping::replaceVariablesInLabel(decode_filter_tags($survey_queue_custom_text), $record, $Proj->firstEventId));
            // Deal with legacy non-rich text editor HTML (not perfect but a decent solution)
            if (strpos($survey_queue_text, '<p>') !== 0) $survey_queue_text = nl2br($survey_queue_text);
		}
		// Survey queue header text
		$table_title = 	RCView::div(array('style'=>''),
							RCView::div(array('style'=>'float:left;color:#800000;font-size:14px;'),
								RCIcon::SurveyQueue("me-1") .
								RCView::tt("survey_505")
							) .
							RCView::div(array('style'=>'float:right;margin-right:10px;'),
								RCView::button(array('class'=>'jqbuttonmed', 'style'=>'', 'onclick'=>"simpleDialog(null,null,'survey_queue_link_dialog',600);"),
									RCView::img(array('src'=>'link.png', 'style'=>'vertical-align:middle;')) .
									RCView::span(array('style'=>'vertical-align:middle;'), RCView::tt("survey_510"))
								)
							) .
							RCView::div(array('class'=>'wrap', 'style'=>'clear:both;padding-top:2px;font-weight:normal;font-size:12px;','data-mlm'=>'survey-queue-text'),
								$survey_queue_text
							)
						);
		// Set table headers
		$table_hdrs = array(
			array(120, RCView::tt("dataqueries_23"), "center"),
			array(($isMobileDevice ? 255 : 655), RCView::tt("survey_49"))
		);
		// Build table
		$html .= renderGrid("survey_queue", $table_title, ($isMobileDevice ? 400 : 800), 'auto', $table_hdrs, $row_data, true, false, false);
		// Hidden dialog div for empty email alert
		$html .= RCView::div(array(
			"id" => "survey_queue_noemail_dialog",
			"class" => "simpleDialog",
			"style" => "z-index: 9999;",
			"data-rc-lang-attrs" => "title=alerts_24",
			"title" => RCView::tt_js("alerts_24")
		), RCView::tt("survey_522"));
		// Hidden dialog div for email sent notification
		$html .= RCView::div(array(
			"id" => "survey_queue_emailsent_dialog",
			"class" => "simpleDialog",
			"style" => "z-index: 9999;",
			"data-rc-lang-attrs" => "title=survey_524",
			"title" => RCView::tt_js("survey_524")
		), RCView::tt_i("survey_1351", [RCView::b(array(
			"id" => "survey_queue_emailsent_email"
		), "")], false));
		// Hidden dialog div for getting link to survey queue
		$html .= RCView::div(array(
			'id'=>'survey_queue_link_dialog',
			'class'=>'simpleDialog',
			'style'=>'z-index: 9999;',
			'data-rc-lang-attrs'=>'title=survey_510', 
			'title'=>RCView::tt_attr("survey_510")),
			RCView::div(array('title'=>''), // prevent tooltip from showing all over the place
					RCView::div(array('style'=>'margin:0 0 20px;'),
						RCView::tt("survey_516")
					) .
					RCView::div(array(),
						RCView::img(array('src'=>'link.png')) .
						RCView::b(RCView::tt("survey_513")) .
						RCView::div(array('style'=>'margin:5px 0 10px 25px;'),
							RCView::text(array('readonly'=>'readonly', 'class'=>'staticInput', 'style'=>'width:90%;', 'onclick'=>"this.select();", 'value'=>$survey_queue_link))
						)
					) .
					RCView::div(array('style'=>'margin:20px 0 15px 10px;color:#999;'),
						"&mdash; ".RCView::tt("global_46"). " &mdash;"
					) .
					RCView::div(array('style'=>'margin-bottom:20px;'),
						RCView::img(array('src'=>'email.png', 'style'=>'margin-right:1px;')) .
						RCView::b(RCView::tt("survey_514")) .
						RCView::div(array('style'=>'margin:5px 0 10px 25px;'),
							RCView::text(array(
								'id'=>'survey_queue_email_send',
								'class'=>'x-form-text x-form-field',
								'style'=>'margin-left:8px;width:250px;',
								'data-mlm'=>'surveyqueue_enteremail', // for on-the-fly translation
								'placeholder'=>RCView::tt_attr("survey_515"), // Enter email address
								'data-rc-lang-attrs'=>'placeholder=survey_515',
								'onblur'=>"if(this.value != ''){redcap_validate(this,'','','soft_typed','email')}",
								'value'=>$participant_email,
							)) .
							RCView::button(array('class'=>'jqbuttonmed', 'style'=>'', 'onclick'=>"
								var emailfld = document.getElementById('survey_queue_email_send');
								if (emailfld.value == '') {
									simpleDialog(null, null, 'survey_queue_noemail_dialog',null,'document.getElementById(\'survey_queue_email_send\').focus();');
								} else if (redcap_validate(emailfld, '', '', '', 'email')) {
									const lang = (window.REDCap && window.REDCap.MultiLanguage) ? window.REDCap.MultiLanguage.getCurrentLanguage() : ''
									$.post('$survey_queue_link',{ to: emailfld.value, lang: lang },function(data){
										if (data != '1') {
											alert(woops);
										} else {
											$('#survey_queue_link_dialog').dialog('close');
											$('#survey_queue_emailsent_email').text(emailfld.value);
											simpleDialog(null,null,'survey_queue_emailsent_dialog',null,null);
										}
									});
								}
							"), RCView::tt("survey_180")) .
							($participant_email != '' ? '' :
								RCView::div(array('style'=>'color:#800000;font-size:11px;margin:5px 10px 0;'), '* '.RCView::tt("survey_1600"))
							)
						)
					)
				)
			);
		// If ajax call, then add a Close button to close the dialog
		if ($isAjax) {
			$html .= RCView::div(array('style'=>'text-align:right;background-color:#fff;padding:8px 15px;'),
						RCView::button(array('class'=>'jqbutton', 'onclick'=>"$('#survey_queue_corner_dialog').hide();$('#overlay').hide();"),
							RCView::span(array('style'=>'line-height:22px;margin:5px;color:#555;'), RCView::tt("calendar_popup_01"))
						)
					 );
		}
		// Hide all completed rows
		$html .=   "<script type='text/javascript'>
                    $(function(){
                        $('#table-survey_queue tr>td>div>div.hidden').parent().parent().parent().addClass('hidden');
                    });
                    </script>";
		// If this is the Acknowledgement section of a survey (and not the Survey Queue page itself),
		// then change the URL to the survey queue link, in case they decide to bookmark the page.
		if ($isSurveyAcknowledgement && !$isAjax) {
			$html .=   "<script type='text/javascript'>
						modifyURL('$survey_queue_link');
						</script>";
		}
		// Return data
		return array(
			"html" => RCView::div(array(), $html),
			"surveys" => $surveys_in_queue,
		);
	}


	// Get the survey title using the survey_id
	public static function getSurveyTitleFromId($survey_id=null)
	{
		// Validate survey id
		if (!is_numeric($survey_id)) return null;
		$sql = "select title from redcap_surveys where survey_id = $survey_id";
		$q = db_query($sql);
		if (db_num_rows($q) == 0) return null;
		return label_decode(db_result($q, 0));
	}


    // Get the record by using the Survey Queue hash
    public static function getRecordUsingSurveyQueueHash($hash)
    {
        $sql = "select record from redcap_surveys_queue_hashes where hash = '".db_escape($hash)."'";
        $q = db_query($sql);
        return db_num_rows($q) ? db_result($q, 0) : null;
    }


	// Get the Survey Queue hash for this record. If doesn't exist yet, then generate it.
	// Use $hashExistsOveride=true to skip the initial check that the hash exists for this record if you know it does not.
	public static function getRecordSurveyQueueHash($record=null, $hashExistsOveride=false, $project_id=null)
	{
		// Validate record name
		if ($record == '') return null;
		if (!is_numeric($project_id)) $project_id = PROJECT_ID;
		if (!is_numeric($project_id)) return false;
		$Proj = new Project($project_id);
		// Default value
		$hashExists = false;
		// Check if record already has a hash
		if (!$hashExistsOveride) {
			$sql = "select hash from redcap_surveys_queue_hashes where project_id = ".$Proj->project_id."
					and record = '".db_escape($record)."' limit 1";
			$q = db_query($sql);
			$hashExists = (db_num_rows($q) > 0);
		}
		// If hash exists, then get it from table
		if ($hashExists) {
			// Hash already exists
			$hash = db_result($q, 0);
		} else {
			// Hash does NOT exist, so generate a unique one
			do {
				// Generate a new random hash
				$hash = generateRandomHash(10);
				// Ensure that the hash doesn't already exist in either redcap_surveys or redcap_surveys_hash (both tables keep a hash value)
				$sql = "select hash from redcap_surveys_queue_hashes where hash = '$hash' limit 1";
				$hashExists = (db_num_rows(db_query($sql)) > 0);
			} while ($hashExists);
			// Add newly generated hash for record
			$sql = "insert into redcap_surveys_queue_hashes (project_id, record, hash)
					values (".$Proj->project_id.", '".db_escape($record)."', '$hash')";
			if (!db_query($sql) && $hashExistsOveride) {
				// The override failed, so apparently the hash DOES exist, so get it
				$hash = self::getRecordSurveyQueueHash($record, false, $project_id);
			}
		}
		// Return the hash
		return $hash;
	}


	// Get the Survey Queue hash for LOTS of records in an array.
	// Return hashes as array values with record name as array key.
	public static function getRecordSurveyQueueHashBulk($records=array())
	{
		// Put hashes in array
		$hashes = array();
		// Get all existing hashes
		$sql = "select record, hash from redcap_surveys_queue_hashes where project_id = ".PROJECT_ID."
				and record in (".prep_implode($records).")";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$hashes[$row['record']] = $row['hash'];
		}
		// For those without a hash, go generate one
		foreach (array_diff($records, array_keys($hashes)) as $this_record) {
			if ($this_record == '') continue;
			$hashes[$this_record] = self::getRecordSurveyQueueHash($this_record);
		}
		// Order by record
		natcaseksort($hashes);
		// Return hashes
		return $hashes;
	}


	// Determine if this survey-event should be displayed in the Survey Queue for this record.
	// Parameter $completedSurveyEvents can be optionally passed, in which it contains the survey_id (first level key)
	// and event_id (second level key) of all completed survey responses for this record.
	public static function checkConditionsOfRecordToDisplayInQueue($project_id, $record, $queueItem, $completedSurveyEvents=null, $record_data=null, $event_id=null, $form_name=null, $repeat_instance=1, $repeat_instrument=null)
	{
		// If conditional upon survey completion, check if completed survey
		$conditionsPassedSurveyComplete = ($queueItem['condition_andor'] == 'AND'); // Initial true value if using AND (false if using OR)
		if (is_numeric($queueItem['condition_surveycomplete_survey_id']) && is_numeric($queueItem['condition_surveycomplete_event_id']))
		{
			// Is it a completed response?
			if (is_array($completedSurveyEvents)) {
				$conditionsPassedSurveyComplete = (isset($completedSurveyEvents[$queueItem['condition_surveycomplete_survey_id']][$queueItem['condition_surveycomplete_event_id']]));
			} else {
				$conditionsPassedSurveyComplete = Survey::isResponseCompleted($queueItem['condition_surveycomplete_survey_id'], $record, $queueItem['condition_surveycomplete_event_id'], $repeat_instance);
			}
			// If not listed as a completed response, then also check Form Status (if entered as plain record data instead of as response), just in case
			if (!$conditionsPassedSurveyComplete) {
				$conditionsPassedSurveyComplete = SurveyScheduler::isFormStatusCompleted($queueItem['condition_surveycomplete_survey_id'], $queueItem['condition_surveycomplete_event_id'], $record, $repeat_instance);
			}
		}
		// If conditional upon custom logic
		$conditionsPassedLogic = ($queueItem['condition_andor'] == 'AND'); // Initial true value if using AND (false if using OR)
		if ($queueItem['condition_logic'] != ''
			// If using AND and $conditionsPassedSurveyComplete is false, then no need to waste time checking evaluateLogicSingleRecord().
			// If using OR and $conditionsPassedSurveyComplete is true, then no need to waste time checking evaluateLogicSingleRecord().
			&& (($queueItem['condition_andor'] == 'OR' && !$conditionsPassedSurveyComplete)
				|| ($queueItem['condition_andor'] == 'AND' && $conditionsPassedSurveyComplete)))
		{
			// Does the logic evaluate as true?
			$conditionsPassedLogic = REDCap::evaluateLogic($queueItem['condition_logic'], $project_id, $record, $event_id, $repeat_instance, $repeat_instrument, $form_name, $record_data);
		}
		// Check pass/fail values and return boolean if record is ready to have its invitation for this survey/event
		if ($queueItem['condition_andor'] == 'OR') {
			// OR
			return ($conditionsPassedSurveyComplete || $conditionsPassedLogic);
		} else {
			// AND (default)
			return ($conditionsPassedSurveyComplete && $conditionsPassedLogic);
		}
	}

    /**
     * Validate and clean the survey queue hash, while also returning the record name to which it belongs
     * @param string $survey_queue_hash 
     * @param bool $redirect Determines whether to redirect in case of invalid hash (true) or to return [null, null] (false)
     * @return array [pid,record]
     */
	public static function checkSurveyQueueHash($survey_queue_hash, $redirect = true)
	{
		// Trim hash, just in case
		$survey_queue_hash = trim($survey_queue_hash ?? "");
		// Ensure integrity of hash, and if extra characters have been added to hash somehow, chop them off.
		if (strlen($survey_queue_hash) > 10) {
			$survey_queue_hash = substr($survey_queue_hash, 0, 10);
		}
		// Check if hash is valid
		$sql = "select project_id, record from redcap_surveys_queue_hashes
				where hash = '".db_escape($survey_queue_hash)."' limit 1";
		$q = db_query($sql);
		$hashValid = (db_num_rows($q) > 0);
		// If the hash is valid, then return project_id and record, else stop and give error message
		if ($hashValid) {
			$row = db_fetch_assoc($q);
			return array($row['project_id'], $row['record']);
		} else {
            if ($redirect) {
                Survey::exitSurvey(RCView::tt("survey_508"), true, RCView::tt("survey_509"), false, "MLM-NO-CONTEXT");
            }
            else {
                return array(null, null);
            }
		}
	}

	/**
	 * Validate and clean the survey hash, while also returning if a legacy hash
	 * @param bool $redirect Determines whether to automatically redirect / display error when there is no valid survey hash
	 * @return string
	 */
	public static function checkSurveyHash($redirect = true)
	{
		// Obtain hash from GET or POST
		$hash = isset($_GET['s']) ? $_GET['s'] : (isset($_POST['s']) ? $_POST['s'] : "");
		// If could not find hash, try as legacy hash
		if (empty($hash)) {
			$hash = isset($_GET['hash']) ? $_GET['hash'] : (isset($_POST['hash']) ? $_POST['hash'] : "");
		}
		// Trim hash, just in case
		$hash = trim($hash ?? "");
		// Ensure integrity of hash, and if extra characters have been added to hash somehow, chop them off.
		$hash_length = strlen($hash);
		if ($hash_length >= 4 && ($hash_length <= 10 || $hash_length == 16) && preg_match("/^([a-z0-9]+)$/i", $hash)) {
			$legacy = false;
		} elseif ($hash_length > 16 && $hash_length < 32 && preg_match("/^([a-z0-9]+)$/i", $hash)) {
			$hash = substr($hash, 0, 16);
			$legacy = false;
		} elseif ($hash_length > 10 && $hash_length < 32 && preg_match("/^([a-z0-9]+)$/i", $hash)) {
			$hash = substr($hash, 0, 10);
			$legacy = false;
		} elseif ($hash_length >= 32 && preg_match("/^([a-z0-9]+)$/", $hash)) {
			$hash = substr($hash, 0, 32);
			$legacy = true;
		} elseif (empty($hash)) {
			// (GR) - It appears this is some relict from old times - rather, redirect to the "enter survey hash page"
			// Survey::exitSurvey("{$lang['survey_11']}
			// 			<a href='javascript:;' style='font-size:16px;color:#800000;' onclick=\"
			// 				window.location.href = app_path_webroot+'Surveys/create_survey.php?pid='+getParameterByName('pid',true)+'&view=showform';
			// 			\">{$lang['survey_12']}</a> {$lang['survey_13']}");

			// Changed behavior - redirect to the "Please enter your access code" page
			// Need to rely on $_SERVER, as APP_PATCH_SURVEY is not defined yet.
			if ($redirect) {
				$url = $_SERVER['PHP_SELF'];
				redirect($url);
			}
			$hash = null;
		} else {
			if ($redirect) {
				Survey::exitSurvey(RCView::tt("survey_14"), true, null, false, "MLM-NO-CONTEXT");
			}
			$hash = null;
		}
		// If legacy hash, then retrieve newer hash to return
		if ($legacy)
		{
			$q = db_query("select hash from redcap_surveys_participants where legacy_hash = '".db_escape($hash)."'");
			if (db_num_rows($q) > 0) {
				$hash = db_result($q, 0);
			} else {
				if ($redirect) {
					Survey::exitSurvey(RCView::tt("survey_14"), true, null, false, "MLM-NO-CONTEXT");
				}
				$hash = null;
			}
		}
		// Return hash
		return $hash;
	}

    /**
     * Determines the project id from a survey hash (returns null in case the survey hash does not exist)
     * @param string $hash 
     * @return string|null Project ID (or null)
     */
    public static function getProjectIdFromSurveyHash($hash) {
        $hash = db_escape($hash);
        $sql = "SELECT s.project_id 
                FROM redcap_surveys s, redcap_surveys_participants h, redcap_metadata m
                WHERE h.hash = '$hash' AND
                      s.survey_id = h.survey_id AND
                      m.project_id = s.project_id AND
                      m.form_name = s.form_name AND
                      h.event_id IS NOT NULL
                LIMIT 1";
        $q = db_query($sql);
        if ($q && db_num_rows($q)) {
            $row = db_fetch_assoc($q);
            return $row["project_id"];
        }
        else {
            return null;
        }
    }

    /**
     * Determines the project, survey, and event ids as well as participant email from a survey hash 
	 * (returns null in case the survey hash does not exist)
     * @param string $hash 
     * @return Array|null Associative array (or null)
     */
    public static function getSurveyContextFromSurveyHash($hash) {
        $hash = db_escape($hash);
        $sql = "SELECT s.project_id, s.survey_id, h.event_id, h.participant_email, s.form_name
                FROM redcap_surveys s, redcap_surveys_participants h, redcap_metadata m
                WHERE h.hash = '$hash' AND
                      s.survey_id = h.survey_id AND
                      m.project_id = s.project_id AND
                      m.form_name = s.form_name AND
                      h.event_id IS NOT NULL
                LIMIT 1";
        $q = db_query($sql);
        if ($q && db_num_rows($q)) {
            $row = db_fetch_assoc($q);
            return $row;
        }
        else {
            return null;
        }
    }

	// Repeating forms/events: Obtain the instance number of a given participant_id in participants table
	// (assuming this is NOT a public survey). Return default of '1' if no rows returned.
	public static function getInstanceNumFromParticipantId($participant_id)
	{
		// Ensure that hash exists. Retrieve ALL survey-related info and make all table fields into global variables
		$sql = "select r.instance from redcap_surveys_response r, redcap_surveys_participants p 
				where p.participant_id = '".db_escape($participant_id)."' and p.participant_id = r.participant_id 
				and p.participant_email is not null limit 1";
		$q = db_query($sql);
		return db_num_rows($q) ? db_result($q, 0) : '1';
	}


	// Obtain the record name of a given participant_id in participants table
	// (assuming this is NOT a public survey). Return default of '1' if no rows returned.
	public static function getRecordFromParticipantId($participant_id)
	{
		// Ensure that hash exists. Retrieve ALL survey-related info and make all table fields into global variables
		$sql = "select r.record from redcap_surveys_response r, redcap_surveys_participants p 
				where p.participant_id = '".db_escape($participant_id)."' and p.participant_id = r.participant_id 
				and p.participant_email is not null limit 1";
		$q = db_query($sql);
		return db_num_rows($q) ? db_result($q, 0) : false;
	}


	// Return the survey link for a given participant_id
	public static function getSurveyLinkFromParticipantId($participant_id)
	{
		// Ensure that hash exists. Retrieve ALL survey-related info and make all table fields into global variables
		$sql = "select hash from redcap_surveys_participants where participant_id = '".db_escape($participant_id)."'";
		$q = db_query($sql);
		return db_num_rows($q) ? APP_PATH_SURVEY_FULL . '?s=' . db_result($q, 0) : '';
	}


	// Return the survey_id for a given participant_id
	public static function getSurveyIdFromParticipantId($participant_id)
	{
		// Ensure that hash exists. Retrieve ALL survey-related info and make all table fields into global variables
		$sql = "select survey_id from redcap_surveys_participants where participant_id = '".db_escape($participant_id)."'";
		$q = db_query($sql);
		return db_num_rows($q) ? db_result($q, 0) : '';
	}
	

	// Pull survey values from tables and set as global variables
	public static function setSurveyVals($hash)
	{
		// Ensure that hash exists for a real form and a real event. Retrieve ALL survey-related info and make all table fields into global variables
		$sql = "select s.*, h.* from redcap_surveys s, redcap_surveys_participants h, redcap_metadata m
                where h.hash = '".db_escape($hash)."' and s.survey_id = h.survey_id and m.project_id = s.project_id 
                and m.form_name = s.form_name and h.event_id is not null limit 1";
		$q = db_query($sql);
		if (!$q || !db_num_rows($q)) {
			Survey::exitSurvey(RCView::tt("survey_14"), true, null, false, "MLM-NO-CONTEXT");
		}
		foreach (db_fetch_assoc($q) as $key => $value)
		{
			if ($value === null) {
				$GLOBALS[$key] = $value;
			} else {
				// Replace non-break spaces because they cause issues with html_entity_decode()
				$value = str_replace(array("&amp;nbsp;", "&nbsp;"), array(" ", " "), $value);
				// Don't decode if cannnot detect encoding
				if (function_exists('mb_detect_encoding') && (
					(mb_detect_encoding($value) == 'UTF-8' && mb_detect_encoding(html_entity_decode($value, ENT_QUOTES)) === false)
					|| (mb_detect_encoding($value) == 'ASCII' && mb_detect_encoding(html_entity_decode($value, ENT_QUOTES)) === 'UTF-8')
				)) {
					$GLOBALS[$key] = trim($value);
				} else {
					$GLOBALS[$key] = trim(html_entity_decode($value, ENT_QUOTES, 'UTF-8'));
				}
			}
		}
	}


	// Returns array of emails, identifiers, phone numbers, and delivery preference for a list of records
	public static function getResponsesEmailsIdentifiers($records=array(), $survey_id=null, $project_id_override=null, $returnEmailsOnly=false)
	{
		if (defined("PROJECT_ID") && !is_numeric($project_id_override)) {
            $project_id_override = PROJECT_ID;
		}
        $Proj = new Project($project_id_override);
        $survey_email_participant_field = $Proj->project['survey_email_participant_field'];
        $survey_phone_participant_field = $Proj->project['survey_phone_participant_field'];
        $twilio_enabled = $Proj->project['twilio_enabled'];

		// If pass in empty array of records, pass back empty array
		if (empty($records)) return array();

		// Get the first event_id of every Arm and place in array
		$firstEventIds = array();
		foreach ($Proj->events as $this_arm_num=>$arm_attr) {
			$arm_events_keys = array_keys($arm_attr['events']);
			$firstEventIds[] = print_r(array_shift($arm_events_keys), true);
		}

		// Create an array to return with participant_id as key and attributes as subarray
		$responseAttributes = array();
		// Pre-fill with all records passed in first
		foreach ($records as $record) {
			if ($record == '') continue;
			$record = label_decode($record);
			if ($returnEmailsOnly) {
				$responseAttributes[$record] = array('email' => '');
            } else {
				$responseAttributes[$record] = array('email' => '', 'identifier' => '', 'phone' => '', 'delivery_preference' => 'EMAIL');
			}
		}

		## GET EMAILS FROM INITIAL SURVEY'S PARTICIPANT LIST (if there is an initial survey)
		if ($Proj->firstFormSurveyId != null)
		{
			// Create record list to query participant table. Escape the record names for the query.
			$partRecordsSql = array();
			foreach ($records as $record) {
				if ($record == '') continue;
				$partRecordsSql[] = label_decode($record);
			}
			// Now use that record list to get the original email from first survey's participant list
			$sql = "select r.record, p.participant_email, p.participant_identifier, p.participant_phone, p.delivery_preference
					from redcap_surveys_participants p, redcap_surveys_response r, redcap_surveys s
					where s.project_id = ".$Proj->project_id." and p.survey_id = s.survey_id and p.participant_id = r.participant_id
					and r.record in (".prep_implode($partRecordsSql).") and s.form_name = '".$Proj->firstForm."'
					and p.event_id in (".prep_implode($firstEventIds).") and p.participant_email is not null";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				$row['record'] = label_decode($row['record']);
				if ($row['participant_email'] != '') {
					$responseAttributes[$row['record']]['email'] = label_decode($row['participant_email']);
				}
				if ($returnEmailsOnly) continue;
				if ($row['participant_identifier'] != '') {
					$responseAttributes[$row['record']]['identifier'] = strip_tags(label_decode($row['participant_identifier']));
				}
				if ($row['participant_phone'] != '') {
					$responseAttributes[$row['record']]['phone'] = $row['participant_phone'];
				}
				if ($row['delivery_preference'] != '') {
					$responseAttributes[$row['record']]['delivery_preference'] = $row['delivery_preference'];
				}
			}
		}
		// If using Twilio and first instrument is not a survey, then re-check (and possibly fix) delivery pref
		// (since it is set for EACH participant_id, which can have different values)
		elseif ($Proj->firstFormSurveyId == null && $twilio_enabled && !$returnEmailsOnly)
		{
			// Create record list to query participant table. Escape the record names for the query.
			$partRecordsSql = array();
			foreach ($records as $record) {
				if ($record == '') continue;
				$partRecordsSql[] = label_decode($record);
			}
			// Obtain delivery pref for records in case they are out of sync and incorrect
			$sql = "select r.record, p.participant_id, p.delivery_preference
					from redcap_surveys_participants p, redcap_surveys_response r, redcap_surveys s
					where s.project_id = ".$Proj->project_id." and p.survey_id = s.survey_id and p.participant_id = r.participant_id
					and r.record in (".prep_implode($partRecordsSql).") and s.form_name != '".$Proj->firstForm."'
					and p.participant_email is not null";
			$q = db_query($sql);
			$blankDelivPref = $changeDelivPref = array();
			while ($row = db_fetch_assoc($q)) {
				$row['record'] = label_decode($row['record']);
				if ($row['delivery_preference'] != '' && $row['delivery_preference'] != 'EMAIL') {
					$responseAttributes[$row['record']]['delivery_preference'] = $row['delivery_preference'];
					$changeDelivPref[$row['record']] = $row['delivery_preference'];
				} elseif ($row['delivery_preference'] == '') {
					$blankDelivPref[$row['record']][] = $row['participant_id'];
				}
			}
			// Loop through participants where we need to retroactively fix their delivery pref
			foreach ($blankDelivPref as $this_record=>$participant_ids) {
				if (isset($changeDelivPref[$this_record])) {
					// Change their preference in the participants table
					$sql = "update redcap_surveys_participants set delivery_preference = '".db_escape($changeDelivPref[$this_record])."'
							where participant_id in (".prep_implode($participant_ids).")";
					$q = db_query($sql);
				}
			}

		}

		## GET ANY REMAINING MISSING EMAILS FROM SPECIAL EMAIL FIELD IN REDCAP_PROJECTS TABLE
		$this_survey_email_participant_field = $survey_email_participant_field;
		if (isset($Proj->surveys[$survey_id]) && $Proj->surveys[$survey_id]['email_participant_field'] != '' && isset($Proj->metadata[$Proj->surveys[$survey_id]['email_participant_field']])) {
			$this_survey_email_participant_field = $Proj->surveys[$survey_id]['email_participant_field'];
		}
		if ($this_survey_email_participant_field != '')
		{
			// Create record list of responses w/o emails to query data table. Escape the record names for the query.
			$partRecordsSql = array();
			foreach ($responseAttributes as $record=>$attr) {
				$partRecordsSql[] = label_decode($record);
			}
			// Now use that record list to get the email value from the data table
			$sql = "select record, value from ".\Records::getDataTable($Proj->project_id)." where project_id = ".$Proj->project_id."
					and field_name = '".db_escape($this_survey_email_participant_field)."'
					and record in (".prep_implode($partRecordsSql).")";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				// Skip if blank
				if ($row['value'] == '') continue;
				// Trim and decode, just in case
				$email = trim(label_decode($row['value']));
				// Don't use it unless it's a valid email address
				if (isEmail($email)) {
					$responseAttributes[label_decode($row['record'])]['email'] = $email;
				}
			}
		}

		## GET ANY REMAINING MISSING PHONE NUMBERS FROM SPECIAL PHONE FIELD IN REDCAP_PROJECTS TABLE
		if ($survey_phone_participant_field != '' && !$returnEmailsOnly)
		{
			// Create record list of responses w/o emails to query data table. Escape the record names for the query.
			$partRecordsSql = array();
			foreach ($responseAttributes as $record=>$attr) {
				if ($attr['phone'] != '') continue;
				$partRecordsSql[] = label_decode($record);
			}
			// Now use that record list to get the phone value from the data table
			$sql = "select record, value from ".\Records::getDataTable($Proj->project_id)." where project_id = ".$Proj->project_id."
					and field_name = '".db_escape($survey_phone_participant_field)."'
					and record in (".prep_implode($partRecordsSql).") and value != ''";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				$phone = preg_replace("/[^0-9]/", "", label_decode($row['value']));
				// Don't use it unless it's a valid phone number
				if ($phone != '') {
					$responseAttributes[label_decode($row['record'])]['phone'] = $phone;
				}
			}
		}

		// Return array
		return $responseAttributes;
	}

	// Determine if at least one survey in the project has the Survey Auto-Continue feature enabled
	public static function anySurveyHasAutoContinueEnabled($project_id)
    {
        $Proj = new Project($project_id);
		foreach ($Proj->surveys as $attr) {
			if ($attr['end_survey_redirect_next_survey'] == '1') {
                return true;
			}
		}
		return false;
    }


	// Display the Survey Queue setup table in HTML table format
	public static function displaySurveyQueueSetupTable()
	{
		global $longitudinal, $Proj, $survey_queue_custom_text, $survey_queue_hide, $lang;

        // Increase memory limit in case needed for intensive processing
        System::increaseMemory(2048);

		// Get this project's currently saved queue
		$projectSurveyQueue = self::getProjectSurveyQueue(false, false);

		// Create list of all surveys/event instances as array to use for looping below and also to feed a drop-down
		$surveyDD = array(''=>'--- '.RCView::getLangStringByKey("survey_404").' ---');
		// Loop through all events (even for classic)
		foreach ($Proj->eventsForms as $this_event_id=>$forms)
		{
			// Go through each form and see if it's a survey
			foreach ($forms as $form)
			{
				// Get survey_id
				$this_survey_id = isset($Proj->forms[$form]['survey_id']) ? $Proj->forms[$form]['survey_id'] : null;
				// Only display surveys, so ignore if does not have survey_id
				if (!is_numeric($this_survey_id)) continue;
				// Add form, event_id, and survey_id to drop-down array
				$title = strip_tags($Proj->surveys[$this_survey_id]['title']);
				$event = $Proj->eventInfo[$this_event_id]['name_ext'];
                $form_display = strip_tags($Proj->forms[$form]["menu"]);
                $option_label = "\"$title\"";
                if ($title != $form_display) {
                    $option_label .= " [$form_display]";
                }
                if ($longitudinal) {
                    $option_label .= " - $event";
                }
                // Add survey to array
                $surveyDD["$this_survey_id-$this_event_id"] = $option_label;
			}
		}
		// Loop through surveys-events
		$hdrs = RCView::tr(array(),
					RCView::td(array('class'=>'header', 'style'=>'width:75px;text-align:center;font-size:11px;'), RCView::tt("survey_430")) .
					RCView::td(array('class'=>'header'), RCView::tt("survey_49")) .
					RCView::td(array('class'=>'header', 'style'=>'width:400px;'), RCView::tt("survey_526")) .
					RCView::td(array('class'=>'header', 'style'=>'width:42px;text-align:center;font-size:11px;line-height:13px;'), RCView::tt("survey_529"))
				);
		$rows = '';
		foreach ($Proj->eventsForms as $event_id=>$these_forms) {
			// Loop through forms
			$alreadyDisplayedEventHdr = false;
			foreach ($these_forms as $form_name) {
				// If form is not enabled as a survey, then skip it
				if (!isset($Proj->forms[$form_name]['survey_id'])) continue;
				// Get survey_id
				$survey_id = $Proj->forms[$form_name]['survey_id'];
				// Skip the first instrument survey since it is naturally not included in the queue till after it is completed
				// if ($survey_id == $Proj->firstFormSurveyId) continue; // In 8.0.2+, now allow the first instrument to be displayed in the survey queue
				// If longitudinal, display Event Name as header
				if ($longitudinal && !$alreadyDisplayedEventHdr) {
					$rows .= RCView::tr(array(),
								RCView::td(array('class'=>'header blue', 'colspan'=>'4', 'style'=>'padding:3px 6px;font-weight:bold;'),
									$Proj->eventInfo[$event_id]['name_ext']
								)
							);
					$alreadyDisplayedEventHdr = true;
				}
				// Set form+event+arm label
				$form_event_label = $Proj->forms[$form_name]['menu'] . (!$longitudinal ? '' : " (" . $Proj->eventInfo[$event_id]['name_ext'] . ")");
				// Get any saved attributes for this survey/event
				if (isset($projectSurveyQueue[$survey_id][$event_id])) {
					$queue_item = $projectSurveyQueue[$survey_id][$event_id];
					$conditionSurveyActivatedChecked = ($queue_item['active']) ? 'checked' : '';
					$conditionSurveyActivatedDisabled = '';
					$conditionSurveyCompChecked = (is_numeric($queue_item['condition_surveycomplete_survey_id']) && is_numeric($queue_item['condition_surveycomplete_event_id'])) ? 'checked' : '';
					$conditionSurveyCompSelected = (is_numeric($queue_item['condition_surveycomplete_survey_id']) && is_numeric($queue_item['condition_surveycomplete_event_id'])) ? $queue_item['condition_surveycomplete_survey_id'].'-'.$queue_item['condition_surveycomplete_event_id'] : '';
					$conditionAndOr = ($queue_item['condition_andor'] == 'OR') ? 'OR' : 'AND';
					$conditionLogicChecked = ($queue_item['condition_logic'] === null || trim($queue_item['condition_logic']) == '') ? '' : 'checked';
					$conditionLogic = $queue_item['condition_logic'];
					$conditionAutoStartChecked = ($queue_item['auto_start']) ? 'checked' : '';
					$queue_item_class = $queue_item_class_firstcell = 'darkgreen';
					$queue_item_active_flag = 'active';
					$queue_item_active_flag_value = '1';
					$queue_item_icon_enabled_style = '';
					$queue_item_icon_disabled_style = 'display:none;';
				} else {
					$conditionSurveyActivatedChecked = $conditionSurveyCompChecked = $conditionSurveyCompSelected = '';
					$conditionAndOr = $conditionLogicChecked = $conditionLogic = $conditionAutoStartChecked = '';
					$queue_item_class_firstcell = $queue_item_active_flag = $queue_item_active_flag_value = '';
					$queue_item_class = 'opacity35';
					$queue_item_icon_enabled_style = 'display:none;';
					$queue_item_icon_disabled_style = '';
					$conditionSurveyActivatedDisabled = 'disabled';
				}
				// Set survey title for this row
				$title = $Proj->surveys[$survey_id]['title'];
                $survey_title = trim(strip_tags($Proj->surveys[$survey_id]['title']));
                $this_survey_title = $survey_title;
                $this_form_label = trim(strip_tags($Proj->forms[$Proj->surveys[$survey_id]['form_name']]['menu']));
                if ($this_survey_title == "") {
                    $this_title = "\"$this_form_label\"";
                } elseif ($this_survey_title == $this_form_label) {
                    $this_title = "\"$this_survey_title\"";
                } else {
                    $this_title = "\"$this_survey_title\"".RCView::div(['class'=>'font-weight-normal'], "[$this_form_label]");
                }
				// Render row
				$rows .= RCView::tr(array('id'=>"sqtr-$survey_id-$event_id", $queue_item_active_flag=>$queue_item_active_flag_value),
							RCView::td(array('class'=>"data $queue_item_class_firstcell", 'valign'=>'top', 'style'=>'text-align:center;padding:6px;padding-top:10px;'),
								// "Enabled" text/icon
								RCView::div(array('id'=>"div_sq_icon_enabled-$survey_id-$event_id", 'style'=>$queue_item_icon_enabled_style),
									RCView::img(array('src'=>'checkbox_checked.png')) .
									RCView::div(array('style'=>'color:green;'), RCView::tt("survey_544")) .
									RCView::div(array('style'=>'padding:20px 0 0;'),
										RCView::button(array('class'=>'jqbuttonsm', 'style'=>'font-size:9px;font-family:tahoma;',
											'onclick'=>"surveyQueueSetupActivate(0, $survey_id, $event_id);return false;"),
											RCView::tt("survey_546")
										)
									)
								) .
								// "Not enabled" text/icon
								RCView::div(array('id'=>"div_sq_icon_disabled-$survey_id-$event_id", 'style'=>$queue_item_icon_disabled_style),
									RCView::img(array('src'=>'checkbox_cross.png')) .
									RCView::div(array('style'=>'color:#DB2A0F;'), RCView::tt("survey_543")) .
									RCView::div(array('style'=>'padding:20px 0 0;'),
										RCView::button(array('class'=>'jqbuttonsm', 'style'=>'font-size:9px;font-family:tahoma;',
											'onclick'=>"surveyQueueSetupActivate(1, $survey_id, $event_id);return false;"),
											RCView::tt("survey_547")
										)
									)
								) .
								// Hidden checkbox to denote activation
								RCView::checkbox(array('name'=>"sqactive-$survey_id-$event_id", 'id'=>"sqactive-$survey_id-$event_id", 'class'=>'hidden', $conditionSurveyActivatedChecked=>$conditionSurveyActivatedChecked))
							) .
							RCView::td(array('class'=>"data $queue_item_class_firstcell", 'style'=>'padding:6px;', 'valign'=>'top'),
								RCView::div(array('style'=>'padding:3px 8px 8px 2px;font-size:13px;'),
									// Survey title
									RCView::span(array('style'=>'font-size:13px;'),
										RCView::b($this_title)
									) .
									// Event name (if longitudinal)
									(!$longitudinal ? '' :
										RCView::span(array(),
											" &nbsp;-&nbsp; ".RCView::escape($Proj->eventInfo[$event_id]['name_ext'])
										)
									)
								)
							) .
							RCView::td(array('class'=>"data $queue_item_class", 'style'=>'padding:6px 6px 3px;font-size:12px;'),
								// When survey is completed
								RCView::div(array('style'=>'padding:1px 0;'),
									RCView::checkbox(array('name'=>"sqcondoption-surveycomplete-$survey_id-$event_id",'id'=>"sqcondoption-surveycomplete-$survey_id-$event_id",$conditionSurveyCompChecked=>$conditionSurveyCompChecked, $conditionSurveyActivatedDisabled=>$conditionSurveyActivatedDisabled)) .
									RCView::tt("survey_419") .
									RCView::br() .
									// Drop-down of surveys/events
                                    RCView::div(['style'=>'margin-left:1.9em;margin-right:1em;'],
                                        RCView::select(array('name'=>"sqcondoption-surveycompleteids-$survey_id-$event_id",'id'=>"sqcondoption-surveycompleteids-$survey_id-$event_id",'class'=>'sq-survey-list-dropdown x-form-text x-form-field','style'=>'font-size:11px;width:100%;max-width:360px;', $conditionSurveyActivatedDisabled=>$conditionSurveyActivatedDisabled,
										                'onchange'=>"$('#sqcondoption-surveycomplete-$survey_id-$event_id').prop('checked', (this.value.length > 0) );  if (this.value.length > 0) hasDependentSurveyEvent(this);"), $surveyDD, $conditionSurveyCompSelected, 200)
                                    )
								) .
								// AND/OR drop-down list for conditions
								RCView::div(array('style'=>'padding:2px 0 1px;'),
									RCView::select(array('name'=>"sqcondoption-andor-$survey_id-$event_id",'id'=>"sqcondoption-andor-$survey_id-$event_id",'style'=>'font-size:11px;', $conditionSurveyActivatedDisabled=>$conditionSurveyActivatedDisabled), array('AND'=>RCView::getLangStringByKey("global_87"),'OR'=>RCView::getLangStringByKey("global_46")), $conditionAndOr)
								) .
								// When logic becomes true
								RCView::div(array('style'=>'text-indent:-1.9em;margin-left:1.9em;'),
									RCView::checkbox(array('name'=>"sqcondoption-logic-$survey_id-$event_id",'id'=>"sqcondoption-logic-$survey_id-$event_id",$conditionLogicChecked=>$conditionLogicChecked, $conditionSurveyActivatedDisabled=>$conditionSurveyActivatedDisabled)) .
									RCView::tt("survey_420") .
									RCView::a(array('href'=>'javascript:;','class'=>'opacity65','style'=>'margin-left:50px;text-decoration:underline;font-size:10px;','onclick'=>"helpPopup('5','category_33_question_1_tab_5')"), RCView::tt("survey_527")) .
									RCView::br() .
									RCView::textarea(array('name'=>"sqcondlogic-$survey_id-$event_id",'id'=>"sqcondlogic-$survey_id-$event_id",'class'=>'x-form-field',
                                        'onfocus'=>'openLogicEditor($(this))',
                                        'style'=>'line-height:12px;font-size:11px;width:100%;max-width:350px;height:50px;resize:auto;',
                                        'onkeydown' => 'logicSuggestSearchTip(this, event);',
                                        'onblur' => "var val = this; setTimeout(function() { logicHideSearchTip(val); this.value=trim(val.value); if(val.value.length > 0) { $('#sqcondoption-logic-$survey_id-$event_id').prop('checked',true); } if(!checkLogicErrors(val.value,1,true)){validate_auto_invite_logic($(val));} }, 0);"),
                                        $conditionLogic) .
                                    logicAdd("sqcondlogic-$survey_id-$event_id") .
									RCView::br() .
									RCView::span(array('style'=>'font-family:tahoma;font-size:10px;color:#888;'),
										($longitudinal ? "(e.g., [enrollment_arm_1][age] > 30 and [enrollment_arm_1][sex] = \"1\")" : "(e.g., [age] > 30 and [sex] = \"1\")") .
                                        RCView::br() .
                                        RCView::table(array('style'=>'font-size:12px;width:98%;margin-top:3px;'),
                                            RCView::tr(array('style'=>'padding: 0px; border: 0;'),
                                                RCView::td(array('style' => 'color: green; font-weight: bold; padding: 0px; text-align: left; vertical-align: middle; border: 0; height: 20px;', 'id' => "sqcondlogic-$survey_id-$event_id"."_Ok"), "&nbsp;")
                                            ) .
                                            RCView::tr(array('style'=>'padding: 0px; border: 0;'),
                                                RCView::td(array('style'=>'border: 0; padding: 0px; text-align: left;'),
                                                    "<span class='logicTesterRecordDropdownLabel'>".RCView::tt("design_705")."</span> ".
                                                    Records::renderRecordListAutocompleteDropdown($Proj->project_id, false, 1000, "logicTesterRecordDropdownSQ", "x-form-text x-form-field", "", "", null, $lang['global_291'],
                                                        'var circle=\''.APP_PATH_IMAGES.'progress_circle.gif\'; if (this.value !== \'\') $(\'#sqcondlogic-'.$survey_id.'-'.$event_id.'_res\').html(\'<img src=\'+circle+\'>\'); else $(\'#sqcondlogic-'.$survey_id.'-'.$event_id.'_res\').html(\'\'); logicCheck($(\'#sqcondlogic-'.$survey_id.'-'.$event_id.'\'), \'branching\', '.($longitudinal ? 'true' : 'false').', \'\', this.value+'.'\'||'.$event_id.'\', \''.js_escape2($lang['design_706']).'\', \''.js_escape2($lang['design_707']).'\', \''.js_escape2($lang['design_713']).'\', [\''.js_escape2($lang['design_716']).'\', \''.js_escape2($lang['design_717']).'\', \''.js_escape2($lang['design_708']).'\'], \'sqcondlogic-'.$survey_id.'-'.$event_id.'\');')
                                                )
                                            ) .
                                            RCView::tr(array('style'=>'padding: 0px; border: 0;'),
                                                RCView::td(array('style'=>'border: 0; padding: 0px; text-align: left;'),
                                                    RCView::span(array('id' => "sqcondlogic-".$survey_id."-".$event_id."_res", 'style' => 'color: green; font-weight: bold;'), "")
                                                )
                                            )
                                        )
									)
								)
							) .
							RCView::td(array('class'=>"data $queue_item_class", 'valign'=>'top', 'style'=>'text-align:center;padding:6px;padding-top:10px;'),
								// Auto start?
								RCView::checkbox(array('name'=>"ssautostart-$survey_id-$event_id", 'id'=>"ssautostart-$survey_id-$event_id", $conditionAutoStartChecked=>$conditionAutoStartChecked, $conditionSurveyActivatedDisabled=>$conditionSurveyActivatedDisabled))
							)
						);
			}
		}

		// HTML
		$html = '';

		// Instructions
		$html .= RCView::div(array('style'=>'margin:0 0 5px;'.($Proj->firstFormSurveyId != null ? '' : 'margin-bottom:20px;')),
					RCView::tt("survey_531") . " " .
					RCView::a(array('href'=>'javascript:;', 'style'=>'text-decoration:underline;', 'onclick'=>"$(this).hide();$('#survey_queue_form_hidden_instr').show();fitDialog($('#surveyQueueSetupDialog'));"),
						RCView::tt("global_58")) .
					RCView::span(array('id'=>'survey_queue_form_hidden_instr', 'style'=>'display:none;'),
						RCView::tt("survey_542") . " " . RCView::tt('design_1112')
                    )
				);

		// If custom text already exists, then display it's textarea box
		$survey_queue_custom_text_style = ($survey_queue_custom_text == '') ? 'display:none;' : '';
		$survey_queue_custom_text_add_style = ($survey_queue_custom_text == '') ? '' : 'display:none;';
		$survey_queue_hide_checked = $survey_queue_hide ? 'checked' : '';

		// Add table/form html if there is something to display
		if (strlen($rows) > 0)
		{
			$html .= addLangToJS(array(
				"survey_506", "survey_511", "survey_538", "survey_539", "survey_540"
			), false);
			// Add table/form html
			$html .= "<form id='survey_queue_form'>" .
						// Header
						RCView::div(array('id'=>'div_survey_queue_custom_text_link', 'style'=>'padding:10px 0 20px 4px;'.$survey_queue_custom_text_add_style),
							RCView::a(array('href'=>'javascript:;', 'style'=>'text-decoration:underline;color:green;', 'onclick'=>"$('#div_survey_queue_custom_text_link').hide();$('#div_survey_queue_custom_text').show('fade'); initMCEEditor('mceSurveyQueueEditor');fitDialog($('#surveyQueueSetupDialog'));"),
								'<i class="fas fa-plus"></i> ' . RCView::tt("survey_541")
							)
						) .
						// Custom text (optional)
						RCView::div(array('id'=>'div_survey_queue_custom_text', 'class'=>'data', 'style'=>'padding:8px 8px 4px;margin:15px 0 15px;background-color:#eee;'.$survey_queue_custom_text_style),
							RCView::div(array('style'=>'margin:0 0 5px;font-weight:bold;'),
								RCView::tt("survey_537") .
								RCView::a(array('href'=>'javascript:;', 'style'=>'font-weight:normal;margin-left:10px;font-size:11px;text-decoration:underline;', 'onclick'=>"$('#div_survey_queue_custom_text_link').show('fade');$('#div_survey_queue_custom_text').hide();$('#survey_queue_custom_text').val('');"),
									'['.RCView::tt("ws_144").']'
								) . '<br>' .
								RCView::span(array('style'=>'font-weight:normal;'),
									RCView::tt("survey_538") . " " .
									RCView::a(array('href'=>'javascript:;', 'style'=>'text-decoration:underline;',
										'onclick'=>"simpleDialog(window.lang.survey_506 + ' ' + window.lang.survey_511, window.lang.survey_538 + ' ' + window.lang.survey_539 + ' ' + window.lang.survey_540, null, 600);"), RCView::tt("survey_539")) . " " .
									RCView::tt("survey_540")
								)
							) .
							RCView::div(array(),
								RCView::textarea(array('name'=>"survey_queue_custom_text",'id'=>"survey_queue_custom_text",'class'=>'x-form-field mceSurveyQueueEditor', 'style'=>'line-height:13px;font-size:12px;width:98%;height:38px;'),
									htmlspecialchars(label_decode($survey_queue_custom_text), ENT_QUOTES)
								) .
								RCView::div(array('style'=>'float:right;margin:0 10px 0 20px; padding-top:5px;'),
									RCView::img(array('src'=>'pipe_small.gif')) .
									RCView::a(array('href'=>'javascript:;', 'style'=>'font-size:11px;color:#3E72A8;text-decoration:underline;', 'onclick'=>"pipingExplanation();"),
										RCView::tt("design_456")
									)
								) .
								RCView::div(array('style'=>'float:right;color:#777;font-size:11px; padding-top:5px;'),
									RCView::tt("survey_1336")
								) .
								RCView::div(array('class'=>'clear'), '')
							)
						) .
                        // Enable the Stealth Queue?
                        RCView::div(array('id'=>'div_survey_queue_hide', 'class'=>'fs14 data mt-1 mb-3 px-3 pt-3 pb-2', 'style'=>'background:#eee;'),
                            RCView::checkbox(array('id'=>'survey_queue_hide', 'name'=>'survey_queue_hide', $survey_queue_hide_checked=>$survey_queue_hide_checked, 'style'=>'position:relative;top:2px;margin-right:3px;')) .
                            RCView::label(array('for'=>'survey_queue_hide', 'class'=>'font-weight-bold'), RCView::tt("survey_1296")) .
                            RCView::div(array('class'=>'fs12 ps-4', 'style'=>'line-height:1.1;'),
								RCView::tt("survey_1297")
                            )
                        ) .
				        // Determine if at least one survey in the project has the Survey Auto-Continue feature enabled
                        (!self::anySurveyHasAutoContinueEnabled(PROJECT_ID) ? '' :
							RCView::div(array('class'=>'fs11 text-danger mb-3 mx-2', 'style'=>'line-height:1.2;'),
								'<i class="fas fa-exclamation-circle"></i> '.RCView::tt("survey_1300")
							)
                        ) .
						// Table of surveys
						"<table cellspacing=0 class='form_border' style='width:100%;table-layout:fixed;'>{$hdrs}{$rows}</table>" .
					"</form>";
		} else {
			// No rows to display, so give notice that they can't use the Survey Queue yet
			$html .= 	RCView::div(array('class'=>'yellow', 'style'=>'max-width:100%;margin:20px 0;'),
							RCView::img(array('src'=>'exclamation_orange.png')) .
							RCView::tt("survey_1342")
						);
		}

		// Return all html to display
		return $html;
	}


	// Obtain the survey hash for array of participant_id's
	public static function getParticipantHashes($participant_id=array())
	{
		// Collect hashes in array with particpant_id as key
		$hashes = array();
		// Retrieve hashes
		$sql = "select participant_id, hash from redcap_surveys_participants
				where participant_id in (".prep_implode($participant_id, false).")";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$hashes[$row['participant_id']] = $row['hash'];
		}
		// Return hashes
		return $hashes;
	}

    // Get project_id using survey_id
    public static function getProjectIdFromSurveyId($survey_id)
    {
        if (!isinteger($survey_id)) return null;
        $sql = "select project_id from redcap_surveys where survey_id = $survey_id";
        $q = db_query($sql);
        return db_result($q, 0);
    }

	// Create a new survey participant for followup survey (email will be '' and not null)
	// Return participant_id (set $forceInsert=true to bypass the Select query if we already know it doesn't exist yet)
	public static function getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id=null, $forceInsert=false, $instance=null, $projectIdOverride=null, $bypassRecordExistsCheck=false)
	{
	    if (isinteger($projectIdOverride)) {
            $project_id = $projectIdOverride;
        } else {
            $project_id = self::getProjectIdFromSurveyId($survey_id);
        }
        $Proj = new Project($project_id);
		$twilio_enabled = $Proj->project['twilio_enabled'];
		$twilio_default_delivery_preference = $Proj->project['twilio_default_delivery_preference'];
		// Make sure record isn't blank
		if ($record == '') return false;
        // Check event_id
        if (!is_numeric($event_id)) return false;
        // If on a form/survey page AND record has not been created yet (but we are about to create it), do not insert any rows in participants/response tables for this non-existent record
        if (!$bypassRecordExistsCheck && !Records::recordExists($project_id, $record)) {
            return false;
        }
		// Set $instance
		$instance = is_numeric($instance) ? (int)$instance : 1;
		// Set flag to perform the insert query
		if ($forceInsert) {
			$doInsert = true;
		}
		// Check if participant_id for this event-record-survey exists yet
		else {
			$sql = "select p.participant_id, p.hash from redcap_surveys_participants p, redcap_surveys_response r
					where p.survey_id = $survey_id and p.participant_id = r.participant_id
					and p.event_id = $event_id and p.participant_email is not null
					and r.record = '".db_escape($record)."' and r.instance = $instance limit 1";
			$q = db_query($sql);
			// If participant_id exists, then return it
			if (db_num_rows($q) > 0) {
				$participant_id = db_result($q, 0, 'participant_id');
				$hash = db_result($q, 0, 'hash');
			} else {
				$doInsert = true;
			}
		}
		// Create placeholder in participants and response tables
		if (isset($doInsert) && $doInsert) {
			// Generate random hash
			$hash = self::getUniqueHash();
			// If participant has a non-NULL delivery preference already, then find it to use in teh Insert query below
            $delivery_preference = ''; // Default null
            if (!empty($Proj->surveys)) {
                $sql = "select distinct p.delivery_preference from redcap_surveys_participants p, redcap_surveys_response r
                        where p.participant_id = r.participant_id and p.participant_email is not null
                        and r.record = '" . db_escape($record) . "' and p.survey_id in (" . prep_implode(array_keys($Proj->surveys)) . ") 
                        order by p.delivery_preference desc limit 1";
                $q = db_query($sql);
                if (db_num_rows($q) > 0) {
                    // Get first non-null preference
                    $delivery_preference = db_result($q, 0);
                } elseif ($Proj->twilio_enabled_surveys && $twilio_enabled == '1' && $twilio_default_delivery_preference != '') {
                    // No rows exist for this record yet in this project, so add the default deliver pref if using Twilio
                    $delivery_preference = $twilio_default_delivery_preference;
                } else {
                    // Default null
                    $delivery_preference = '';
                }
            }
			// Since participant_id does NOT exist yet, create it.
			$sql = "insert into redcap_surveys_participants (survey_id, event_id, participant_email, participant_identifier, hash, delivery_preference)
					values ($survey_id, $event_id, '', null, '$hash', ".checkNull($delivery_preference).")";
			if (!db_query($sql)) return false;
			$participant_id = db_insert_id();
			// Now place empty record in surveys_responses table to complete this process (sets first_submit_time as NULL - very crucial for followup)
			$sql = "insert into redcap_surveys_response (participant_id, record, instance) values ($participant_id, '".db_escape($record)."', $instance)";
			if (!db_query($sql)) {
				// If query failed (likely to the fact that it already exists, which it shouldn't), then undo
				db_query("delete from redcap_surveys_participants where participant_id = $participant_id");
				// If $forceInsert flag was to true, then try with it set to false (in case there was a mistaken determining that this placeholder existed already)
				if (!$forceInsert) {
					return false;
				} else {
					// Run recursively with $forceInsert=false
					return self::getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id, false, $instance, $Proj->project_id);
				}
			}
			## CHECK FOR RACE CONDITION
			// Now make sure that we didn't somehow end up with duplicate rows in participants table (due to race conditions)
			$sql = "select p.participant_id from redcap_surveys_participants p, redcap_surveys_response r
					where p.participant_id = r.participant_id and p.survey_id = $survey_id and p.participant_email is not null
					and p.event_id = $event_id and r.record = '".db_escape($record)."' and r.instance = $instance order by p.participant_id";
			$q = db_query($sql);
			if (db_num_rows($q) > 1) {
				// Delete all rows except one
				$del_parts = array();
				while ($row = db_fetch_assoc($q)) {
					$del_parts[] = $row['participant_id'];
				}
				// Remove the first one (because we don't want to delete the original participant_id)
				$participant_id = array_shift($del_parts);
				$sql = "delete from redcap_surveys_participants where participant_id in (" . prep_implode($del_parts) . ")";
				db_query($sql);
				// Get new hash for this new participant_id
				$sql = "select hash from redcap_surveys_participants where participant_id = $participant_id";
				$q = db_query($sql);
				$hash = db_result($q, 0);
			}
		}
		// Return nothing if could not store hash
		return array($participant_id, $hash);
	}

	// Creates unique return_code (that is, unique within that survey) and returns that value
	public static function getUniqueReturnCode($survey_id=null, $response_id=null)
	{
		// Make sure we have a survey_id value
		if (!is_numeric($survey_id)) return false;
		// If response_id is provided, then fetch existing return code. If doesn't have a return code, then generate one.
		if (is_numeric($response_id))
		{
			// Query to get existing return code
			$sql = "select r.return_code from redcap_surveys_participants p, redcap_surveys_response r
					where p.survey_id = $survey_id and r.response_id = $response_id
					and p.participant_id = r.participant_id limit 1";
			$q = db_query($sql);
			$existingCode = (db_num_rows($q) > 0) ? db_result($q, 0) : "";
			if ($existingCode != "") {
				return strtoupper($existingCode);
			}
		}
		// Generate a new unique return code for this survey (keep looping till we get a non-existing unique value)
		// The outer loop ensures that no duplicates codes are entered into the database in case of a 1:5.5 billion chance on an identical code generated in a race condition
		// This implementation will not fix the return code that is generated for the "anonymous" respondent (which bypasses the if clause). But since this return code is never shown to anybody, we should be fine.
        $loops = 0;
        $maxloops = 50;
		do {
			do {
				// Generate a new random hash
				$code = strtolower(generateRandomHash(8, false, true));
				// Ensure that the hash doesn't already exist
				$sql = "SELECT r.return_code 
						FROM redcap_surveys_participants p, redcap_surveys_response r
						WHERE p.survey_id = $survey_id 
							AND r.return_code = '$code'
							AND p.participant_id = r.participant_id 
						LIMIT 1";
				$q = db_query($sql);
				$codeExists = (db_num_rows($q) > 0);
			}
			while ($codeExists);

			// If the response_id provided does not have an existing code, then save the new one we just generated
			$code_is_unique = true; // We assume this for now and will check later, after actually writing to the database
			if (isinteger($response_id) && $existingCode == "")
			{
                // Update table
				$sql = "UPDATE redcap_surveys_response 
						SET return_code = '$code' 
						WHERE response_id = $response_id and return_code is null";
                if (db_query($sql) && db_affected_rows() > 0) {
                    // The newly generated return code was just added to the table. Now check for uniqueness again by querying the database.
	                $sql = "SELECT r.return_code 
                            FROM redcap_surveys_participants p, redcap_surveys_response r
                            WHERE p.survey_id = $survey_id 
                                AND p.participant_id = r.participant_id
                                AND r.return_code = '$code'";
	                $q = db_query($sql);
	                $code_is_unique = (db_num_rows($q) == 1);
                    // If return code exists for another row, then set null what we just added
                    if (!$code_is_unique) {
	                    $sql = "UPDATE redcap_surveys_response SET return_code = NULL WHERE response_id = $response_id";
	                    db_query($sql);
                    }
                } else {
                    // The code has somehow already been set (via a moment prior via a race condition?), so get the already-stored code and return it
	                $sql = "SELECT return_code from redcap_surveys_response WHERE response_id = $response_id";
	                $code = db_result(db_query($sql));
	                $code_is_unique = true;
                }
			}
            // Prevent infinite loops due to race condition (not sure how they are occurring yet).
            // I don't love returning a blank code though but not sure how to prevent this.
            if ($loops++ >= $maxloops) return "";
		}
		while (!$code_is_unique);
		// Code is unique, so return it
		return strtoupper($code);
	}


	// Obtain survey return code for record-instrument[-event]
	public static function getSurveyReturnCode($record='', $instrument='', $event_id='', $instance=1, $overrideSaveAndReturn=false, $projectIdOverride=null)
	{
	    if (isinteger($projectIdOverride)) {
	        $Proj = new Project($projectIdOverride);
        } else {
			global $Proj;
        }
		// Return NULL if no record name or not instrument name
		if ($record == '' || $instrument == '') return null;
		// If a longitudinal project and no event_id is provided, return null
		if ($Proj->longitudinal && !is_numeric($event_id)) return null;
		// If a non-longitudinal project, then set event_id automatically
		if (!$Proj->longitudinal) $event_id = $Proj->firstEventId;
		// If instrument is not a survey, return null
		if (!isset($Proj->forms[$instrument]['survey_id'])) return null;
		// Get survey_id
		$survey_id = $Proj->forms[$instrument]['survey_id'];
		// If "Save & Return Later" is not enabled, then return null
		if (!$overrideSaveAndReturn && !$Proj->surveys[$survey_id]['save_and_return'] && !self::surveyLoginEnabled($Proj->project_id)) return null;
		// If instance is provided for a non-repeating form or event, then revert to 1
		if (!is_numeric($instance)) $instance = 1;
		if (!$Proj->isRepeatingForm($event_id, $instrument) && !($Proj->longitudinal && $Proj->isRepeatingEvent($event_id))) {
			$instance = 1;
		}
		// Check if return code exists already
		$sql = "select r.response_id, r.return_code from redcap_surveys_participants p, redcap_surveys_response r
				where p.survey_id = $survey_id and p.participant_id = r.participant_id
				and record = '".db_escape($record)."' and p.event_id = $event_id and r.instance = '".db_escape($instance)."'
				order by p.participant_email desc, r.response_id limit 1";
		$q = db_query($sql);
		if (db_num_rows($q) > 0) {
			// Get return code that already exists in table
			$return_code = db_result($q, 0, 'return_code');
			$response_id = db_result($q, 0, 'response_id');
			// If code is blank, then try to generate a return code
			if ($return_code == '') {
				$return_code = self::getUniqueReturnCode($survey_id, $response_id);
			}
		} else {
			// Make sure the record exists first, else return null
			if (!Records::recordExists($Proj->project_id, $record)) return null;
			// Create new row in response table
			self::getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id, false, $instance, $Proj->project_id);
			// Row now exists in response table, but it has no return code, so recursively re-run this method to generate it.
			return self::getSurveyReturnCode($record, $instrument, $event_id, $instance, false, $Proj->project_id);
		}
		// Return the code
		return ($return_code == '' ? null : strtoupper($return_code));
	}


	// Obtain the survey hash for specified email address (return the first if multiple exist) - works only for initial survey
	public static function getSurveyHashByEmail($survey_id, $event_id, $email, $identifier=null)
	{
        if (!isEmail($email) || !isinteger($survey_id) || !isinteger($event_id)) return false;
        $identifier = trim($identifier??"");
		$sql = "select hash from redcap_surveys_participants 
                where survey_id = $survey_id and event_id = $event_id 
                and participant_email = '".db_escape($email)."' 
                and participant_identifier ".($identifier == '' ? "is null" : "= '".db_escape($identifier)."'")."
                order by participant_id limit 1";
		$q = db_query($sql);
        return db_num_rows($q) ? db_result($q, 0) : false;
	}


	// Obtain the survey hash for specified event_id (return public survey hash if participant_id is not provided)
	public static function getSurveyHash($survey_id = null, $event_id = null, $participant_id=null, $Proj=null)
	{
	    if ($Proj == null) {
			global $Proj;
        }
		
		if ($participant_id === null && $event_id !== null && $event_id != $Proj->getFirstEventIdInArmByEventId($event_id)) return "";
		if ($participant_id === null && $survey_id !== null && $survey_id != $Proj->firstFormSurveyId) return "";

		// Check event_id (use first event_id in project if not provided)
		if (!is_numeric($event_id)) $event_id = $Proj->firstEventId;
		if (!is_numeric($survey_id)) $survey_id = $Proj->firstFormSurveyId;

		// Retrieve hash ("participant_email=null" means it's a public survey)
		$sql = "select hash from redcap_surveys_participants where survey_id = $survey_id and event_id = $event_id ";
		if (!is_numeric($participant_id)) {
			// Public survey
			$sql .= "and participant_email is null ";
		} else {
			// Specific participant
			$sql .= "and participant_id = $participant_id ";
		}
		$sql .= "order by participant_id limit 1";
		$q = db_query($sql);

		// Hash exists
		if (db_num_rows($q) > 0) {
			$hash = db_result($q, 0);
		}
		// Create hash
		else {
			$hash = self::setHash($survey_id, null, $event_id, null, (!is_numeric($participant_id)));
		}

		return $hash;
	}


	// Create a new survey hash [for current arm]
	public static function setHash($survey_id, $participant_email=null, $event_id=null, $identifier=null,
								   $isPublicSurvey=false, $phone="", $delivery_preference="")
	{
		// Check event_id
		if (!is_numeric($event_id)) return false;

		// Set string for email (null = public survey
		$sql_participant_email = ($participant_email === null) ? "null" : "'" . db_escape($participant_email) . "'";

		// Create unique hash
		$hash = self::getUniqueHash(16, $isPublicSurvey);
		$sql = "insert into redcap_surveys_participants (survey_id, event_id, participant_email, participant_phone, participant_identifier, hash, delivery_preference)
				values ($survey_id, $event_id, $sql_participant_email, " . checkNull($phone) . ", " . checkNull($identifier) . ", '$hash', " . checkNull($delivery_preference) . ")";
		$q = db_query($sql);

		// Return nothing if could not store hash
		return ($q ? $hash : "");
	}


	// Creates unique hash after checking current hashes in tables, and returns that value
	static function getUniqueHash($hash_length=16, $isPublicSurvey=false)
	{
		do {
			// Generate a new random hash
			$hash = generateRandomHash($hash_length, false, $isPublicSurvey);
			// Ensure that the hash doesn't already exist in either redcap_surveys or redcap_surveys_hash (both tables keep a hash value)
			$sql = "select hash from redcap_surveys_participants where hash = '$hash' limit 1";
			$hashExists = (db_num_rows(db_query($sql)) > 0);
		} while ($hashExists);
		// Hash is unique, so return it
		return $hash;
	}


	// Return boolean for if Survey Login is enabled
	public static function surveyLoginEnabled($projectIdOverride=null)
	{
		if (isinteger($projectIdOverride)) {
			$Proj = new Project($projectIdOverride);
			$survey_auth_enabled = $Proj->project['survey_auth_enabled'];
		} else {
			global $survey_auth_enabled;
		}
		return ($survey_auth_enabled == '1');
	}


	// Survey Login: Display survey login form for respondent to log in
	public static function getSurveyLoginForm($record=null, $surveyLoginFailed=false, $surveyTitle=null)
	{
		global $survey_auth_field1, $survey_auth_event_id1, $survey_auth_field2, $survey_auth_event_id2,
			   $survey_auth_field3, $survey_auth_event_id3, $survey_auth_min_fields, $longitudinal,
			   $survey_auth_custom_message, $Proj, $multiple_arms;
		// Put html in $html
		$html = $rows = "";
		// Set array of fields/events
		$surveyLoginFieldsEvents = self::getSurveyLoginFieldsEvents();
		// Count auth fields
		$auth_field_count = count($surveyLoginFieldsEvents);
		
		// If this project has multiple arms, then do not force login if the login fields exist
		// on an arm where the record does not exist.
		$recordArms = array();
		if ($multiple_arms) {
			$recordArms = Records::getRecordListPerArm($Proj->project_id, array($record));
			foreach ($surveyLoginFieldsEvents as $key=>$fieldEvent) {
				$thisEventArm = $Proj->eventInfo[$fieldEvent['event_id']]['arm_num'];
				// If this event exists on an arm where the record doesn't exist, then remove the login field (not applicable)
				if (!isset($recordArms[$thisEventArm])) {					
					// Remove the field
					unset($surveyLoginFieldsEvents[$key]);
					$auth_field_count--;
				}
			}
			// If we've removed all the fields because they exist on other arms with no data, then don't show login form
			if (empty($surveyLoginFieldsEvents)) {
				return false;
			}
		}

		// If record already exists, then retrieve its data to see if we need to display all fields in login form.
		if ($record != '' && $auth_field_count >= $survey_auth_min_fields ) {
			$data_fields = $data_events = array();
			foreach ($surveyLoginFieldsEvents as $fieldEvent) {
				$data_fields[] = $fieldEvent['field'];
				$data_events[] = $fieldEvent['event_id'];
			}
			// Get data for record
			$survey_login_data = Records::getData('array', $record, $data_fields, $data_events);
			// Loop through fields again and REMOVE any where the value is empty for this record
			foreach ($surveyLoginFieldsEvents as $key=>$fieldEvent) {
				if (empty($survey_login_data) || isset($survey_login_data[$record][$fieldEvent['event_id']][$fieldEvent['field']])
					&& $survey_login_data[$record][$fieldEvent['event_id']][$fieldEvent['field']] == '' ) {
					// Remove the field
					unset($surveyLoginFieldsEvents[$key]);
					$auth_field_count--;
				}
			}
		}

		// Count auth fields again (in case some were removed)
		$auth_field_count = count($surveyLoginFieldsEvents);


		// Loop through array of login fields
		if ($auth_field_count >= $survey_auth_min_fields) {
            $surveyLoginRowNum = 1;
			foreach ($surveyLoginFieldsEvents as $fieldEvent)
			{
				// Get field and event_id
				$survey_auth_field_variable = $fieldEvent['field'];
				$survey_auth_event_id_variable = $fieldEvent['event_id'];
				// Set some attributes
				$dformat = $width = $onblur = "";
				$val_type = $Proj->metadata[$survey_auth_field_variable]['element_validation_type'];
				if ($val_type != '') {
					$onblur = "redcap_validate(this,'','','soft_typed','$val_type',1);";
					// Adjust size for date/time fields
					if ($val_type == 'time' || substr($val_type, 0, 4) == 'date' || substr($val_type, 0, 5) == 'date_') {
						$dformat = MetaData::getDateFormatDisplay($val_type);
						$width = "width:".MetaData::getDateFieldWidth($val_type).";";
					}
				}
				$field_note = "";
				if ($Proj->metadata[$survey_auth_field_variable]['element_note'] != "") {
					$field_note = RCView::div(array(
						'class'=>'note',
						'style'=>'width:100%;',
						'data-mlm-field'=>$survey_auth_field_variable,
						'data-mlm-type'=>"note"
					), $Proj->metadata[$survey_auth_field_variable]['element_note']);
                }
				// Add row
                $surveyLoginRowClass = "survey-login-row".$surveyLoginRowNum;
				$rows .= RCView::tr(array('class'=>$surveyLoginRowClass),
							RCView::td(array(
								'valign'=>'top', 
								'class'=>'labelrc', 
								'style'=>'font-size:14px;'), RCView::div(array(
									'data-mlm-field' => $survey_auth_field_variable,
									'data-mlm-type' => "label"
								),
								Piping::replaceVariablesInLabel(filter_tags($Proj->metadata[$survey_auth_field_variable]['element_label']),
									$record, $survey_auth_event_id_variable)
							)) .
							RCView::td(array('valign'=>'top', 'class'=>'data', 'style'=>'width:320px;'),
								RCView::input(array('type'=>'password', 'name'=>$survey_auth_field_variable, 'class'=>"x-form-text x-form-field $val_type",
									'onblur'=>$onblur, 'size'=>'30', 'style'=>$width, 'autocomplete'=>'new-password'), '') .
								$dformat .
								$field_note .
								RCView::div(array('style'=>'margin-top:2px;font-size:11px;color:#666;font-weight:normal;'),
									RCView::checkbox(array('onclick'=>"passwordMask($('#survey_login_dialog tr.{$surveyLoginRowClass} input[name=\"$survey_auth_field_variable\"]'),$(this).prop('checked'));")) .
									RCView::tt("survey_1066")
								)
							)
						);
                $surveyLoginRowNum++;
		    }
		}
		// Instructions
		$numOutOfNum = ($survey_auth_min_fields < $auth_field_count)
			? RCView::tt_i("survey_1345", [$survey_auth_min_fields, $auth_field_count])
			: ($auth_field_count > 1 ? RCView::tt("survey_578") : RCView::tt("survey_587"));
		$html .= RCView::div(array('id'=>'survey-login-instructions'),
					RCView::p(array('style'=>'font-size:14px;margin:5px 0 15px;color:#800000;'),
						RCView::tt("survey_310") . " \"" . RCView::b(array(
							"data-mlm" => "survey-title"
						), RCView::escape($surveyTitle)) . "\""
					) .
					RCView::p(array('style'=>'font-size:14px;margin:5px 0 15px;'),
						RCView::tt("survey_574") . " " .
						RCView::b($numOutOfNum) . " " . RCView::tt("survey_594")
					)
				);
		// If previous login attempt failed, then display error message
		if ($surveyLoginFailed === true) {
			// Display default error message
			$html .= RCView::div(array('class'=>'red survey-login-error-msg', 'style'=>'margin:0 0 20px;'),
						"<i class=\"fas fa-exclamation-circle text-danger\"></i> " .
						($survey_auth_min_fields == '1' ? RCView::tt("survey_1343") : RCView::tt("survey_1344")) .
						// Display custom message (if set)
						(trim($survey_auth_custom_message) == '' ? '' :
							RCView::div(array(
								'style'=>'margin:10px 0 0;',
								'data-mlm'=>'sq-survey_auth_custom_message'
							),
								nl2br(filter_tags(br2nl(trim($survey_auth_custom_message))))
							)
						)
					);
		}
		// If there are no fields to display (most likely because the participant has no data for the required fields),
		// then display an error message explaining this.
		if ($rows == '') {
			// Display default error message
			$html .= RCView::div(array('class'=>'red survey-login-error-msg', 'style'=>'margin:0 0 20px;'),
						RCView::img(array('src'=>'exclamation.png')) .
						RCView::b(RCView::tt("global_01") . RCView::tt("colon")) . " " .
						RCView::tt("survey_589") .
						// Display custom message (if set)
						(trim($survey_auth_custom_message) == '' ? '' :
							RCView::div(array('style'=>'margin:10px 0 0;', 'data-mlm'=>'sq-survey_auth_custom_message'),
								nl2br(filter_tags(br2nl(trim($survey_auth_custom_message))))
							)
						)
					);
		}
		// Add form and table
		$html .= RCView::form(array('id'=>'survey_auth_form', 'action'=>$_SERVER['REQUEST_URI'], 'enctype'=>'multipart/form-data', 'target'=>'_self', 'method'=>'post'),
					RCView::table(array('cellspacing'=>0, 'class'=>'form_border'), $rows) .
					// Hidden input to denote this specific action
					RCView::hidden(array('name'=>'survey-auth-submit'), '1')
				);
		// Return html
		return array(
			RCView::div(array('id'=>'survey_login_dialog', 'class'=>'simpleDialog', 'style'=>'margin-bottom:10px;'), $html),
			$surveyLoginFieldsEvents
		);
	}


	// Get list of Text variables in project that can be used for Survey Login fields that can
	// be used as options in a drop-down.
	public static function getTextFieldsForDropDown()
	{
		global $Proj;
		// Build an array of drop-down options listing all REDCap fields
		$rc_fields = array(''=>'-- '.RCView::getLangStringByKey("random_02").' --');
		foreach ($Proj->metadata as $this_field=>$attr1) {
			// Text fields only
			if ($attr1['element_type'] != 'text') continue;
			// Exclude record ID field?
			if ($this_field == $Proj->table_pk) continue;
			// Add to fields/forms array. Get form of field.
			$this_form_label = strip_tags($Proj->forms[$attr1['form_name']]['menu']);
			// Truncate label if long
            $attr1['element_label'] = trim(strip_tags($attr1['element_label']));
			if (mb_strlen($attr1['element_label']) > 65) {
				$attr1['element_label'] = trim(mb_substr($attr1['element_label'], 0, 47)) . "... " . trim(mb_substr($attr1['element_label'], -15));
			}
			$rc_fields[$this_form_label][$this_field] = "$this_field \"{$attr1['element_label']}\"";
		}
		// Return all options
		return $rc_fields;
	}


	// Return array of field name and event_id of the survey auth fields (up to 3)
	public static function getSurveyLoginFieldsEvents()
	{
		global $survey_auth_field1, $survey_auth_event_id1, $survey_auth_field2, $survey_auth_event_id2,
			   $survey_auth_field3, $survey_auth_event_id3, $Proj;
		// Set array of fields
		$survey_auth_fields = array(1, 2, 3);
		$loginFieldsEvents = array();
		// Loop through array of login fields
		foreach ($survey_auth_fields as $num)
		{
			// Get global variable for this login field
			$survey_auth_field = 'survey_auth_field'.$num;
			$survey_auth_event_id = 'survey_auth_event_id'.$num;
			$survey_auth_field_variable = $$survey_auth_field;
			$survey_auth_event_id_variable = $$survey_auth_event_id;
			if ($survey_auth_field_variable != '' && isset($Proj->metadata[$survey_auth_field_variable])) {
				// Make sure event_id is valid, else default to first event_id
				if (!isset($Proj->eventInfo[$survey_auth_event_id_variable])) $survey_auth_event_id_variable = $Proj->firstEventId;
				// Add to array
				$loginFieldsEvents[] = array('field'=>$survey_auth_field_variable, 'event_id'=>$survey_auth_event_id_variable);
			}
		}
		// Return array
		return $loginFieldsEvents;
	}


	// Return boolean if the "check survey login failed attempts" is enabled
	public static function surveyLoginFailedAttemptsEnabled()
	{
		global $survey_auth_fail_limit, $survey_auth_fail_window;
		return (is_numeric($survey_auth_fail_limit) && $survey_auth_fail_limit > 0 && is_numeric($survey_auth_fail_window) && $survey_auth_fail_window > 0);
	}


	// Return the auto-logout time (in minutes) for Survey Login (based on $autologout_timer for REDCap sessions). Default = 30 if not set.
	public static function getSurveyLoginAutoLogoutTimer()
	{
		global $autologout_timer;
		return ($autologout_timer == "0" || !is_numeric($autologout_timer)) ? 30 : $autologout_timer;
	}


	// Generate or retrieve a Survey Access Codes for multiple participants and return array with
	// participant_id's as key and access code as value.
	public static function getAccessCodes($participant_ids=array())
	{
		if (!is_array($participant_ids)) return false;
		// Query to see if Survey Access Code has already been generated
		$partIdsAccessCodes = array();
		$sql = "select participant_id, access_code from redcap_surveys_participants
				where participant_id in (".prep_implode($participant_ids).")";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			// If access code is null, then generate it
			if ($row['access_code'] == '') {
				$partIdsAccessCodes[$row['participant_id']] = self::getAccessCode($row['participant_id'], false, true);
			} else {
				$partIdsAccessCodes[$row['participant_id']] = $row['access_code'];
			}
		}
		// Return array
		return $partIdsAccessCodes;
	}


	// Generate a new Survey Access Code (or retrieve existing one) OR generate new Short Code
	public static function getAccessCode($participant_id, $shortCode=false, $forceGenerate=false, $return_numeral=false)
	{
		if (!is_numeric($participant_id)) return false;
		if (!$shortCode) {
			## SURVEY ACCESS CODE
			// Determine access code's column name in db table
			$code_colname = ($return_numeral) ? "access_code_numeral" : "access_code";
			// Query to see if Survey Access Code has already been generated
			if (!$forceGenerate) {
				$sql = "select $code_colname from redcap_surveys_participants where participant_id = $participant_id
						and $code_colname is not null limit 1";
				$q = db_query($sql);
			}
			if (!$forceGenerate && db_num_rows($q)) {
				// Get existing code
				$code = db_result($q, 0);
			} else {
				// Generate random non-existing code
				do {
					// Generate a new random code
					if ($return_numeral) {
						$maxRand = mt_getrandmax();
						if ($maxRand > 9999999999) $maxRand = 9999999999;
						$code = sprintf("%010d", random_int(0, $maxRand));
					} else {
						$code = generateRandomHash(9, false, true);
					}
					// Ensure that the code doesn't already exist in the table
					$sql = "select $code_colname from redcap_surveys_participants where $code_colname = '".db_escape($code)."' limit 1";
					$codeExists = (db_num_rows(db_query($sql)) > 0);
				} while ($codeExists);
				// Add code to table
				$sql = "update redcap_surveys_participants set $code_colname = '".db_escape($code)."' 
						where participant_id = $participant_id and $code_colname is null";
				if (!db_query($sql)) return false;
				if (db_affected_rows() == 0) {
					// If no changes were made, that means that there was already a non-null value, so return that value					
					$sql = "select $code_colname from redcap_surveys_participants where participant_id = $participant_id";
					$q = db_query($sql);
					$code = db_result($q, 0);
				}
			}
		} else {
			## SHORT CODE
			// Generate random non-existing code
			do {
				// Generate a new random code
				$code = generateRandomHash(2, false, true, true) . sprintf("%03d", random_int(0, 999));
				// Ensure that the code doesn't already exist in the table
				$sql = "select code from redcap_surveys_short_codes where code = '".db_escape($code)."' limit 1";
				$codeExists = (db_num_rows(db_query($sql)) > 0);
			} while ($codeExists);
			// Add code to table
			$sql = "insert into redcap_surveys_short_codes (ts, code, participant_id) values
					('".NOW."', '".db_escape($code)."', $participant_id)";
			if (!db_query($sql)) return false;
		}
		// Code is unique, so return it
		return $code;
	}


	// Validate the Survey Code and redirect to the survey
	public static function validateAccessCodeForm($code)
	{
		global $redcap_version;
		// Get length of code
        $code_orig = $code;
		$code_length = strlen($code);
		// Is a short code?
		$isShortCode = ($code_length == self::SHORT_CODE_LENGTH && preg_match("/^[A-Za-z0-9]+$/", $code));
		// Is an access code?
		$isAccessCode = ($code_length == self::ACCESS_CODE_LENGTH && preg_match("/^[A-Za-z0-9]+$/", $code));
		// Is a numeral access code?
		$isNumeralAccessCode = ($code_length == self::ACCESS_CODE_NUMERAL_LENGTH && is_numeric($code));
		// Is a numeral access code beginning with "V", which denotes that Twilio should call them?
		$lengthPrependAccessCodeNumeral = strlen(self::PREPEND_ACCESS_CODE_NUMERAL);
		$isNumeralAccessCodeReceiveCall = (!$isShortCode && !$isAccessCode && !$isNumeralAccessCode
			&& $code_length == (self::ACCESS_CODE_NUMERAL_LENGTH + $lengthPrependAccessCodeNumeral)
			&& strtolower(substr($code, 0, $lengthPrependAccessCodeNumeral)) == strtolower(self::PREPEND_ACCESS_CODE_NUMERAL)
			&& is_numeric(substr($code, $lengthPrependAccessCodeNumeral)));
		if ($isNumeralAccessCodeReceiveCall) {
			$code = substr($code, $lengthPrependAccessCodeNumeral);
			$isNumeralAccessCode = true;
		}
		// If not a valid code based on length or content alone, then stop
		if (!$isShortCode && !$isAccessCode && !$isNumeralAccessCode && !$isNumeralAccessCodeReceiveCall) return false;
		// Determine if Short Code or normal Access Code
		if ($isShortCode) {
			## SHORT CODE
			// Get timestamp older than X minutes
			$xMinAgo = date("Y-m-d H:i:s", mktime(date("H"),date("i")-Survey::SHORT_CODE_EXPIRE,date("s"),date("m"),date("d"),date("Y")));
			$sql = "select p.hash from redcap_surveys_participants p, redcap_surveys_short_codes c
					where p.participant_id = c.participant_id and c.code = '".db_escape($code)."' and c.ts > '$xMinAgo' limit 1";
			$q = db_query($sql);
			if (db_num_rows($q) == 0) return false;
			$hash = db_result($q, 0);
			// Now remove the code since it only gets used once
			$sql = "delete from redcap_surveys_short_codes where code = '".db_escape($code)."' limit 1";
			db_query($sql);
		} elseif (!$isShortCode) {
			## SURVEY ACCESS CODE
			$sql = "select hash from redcap_surveys_participants where "
				 . ($isNumeralAccessCode ? "access_code_numeral = '".db_escape($code)."'" : "access_code = '".db_escape($code)."'");
			$q = db_query($sql);
			if (db_num_rows($q) == 0) return false;
			$hash = db_result($q, 0, 'hash');
            // If user submitted code in order to receive phone call, then initiate survey by calling them
            // if ($isNumeralAccessCodeReceiveCall && isset($_POST['From'])) {
            if ($isNumeralAccessCodeReceiveCall && substr($code_orig, 0, 1) == self::PREPEND_ACCESS_CODE_NUMERAL && isset($_POST['From'])) {
                // Obtain project_id via the access codes
                $_GET['pid'] = TwilioRC::getProjectIdFromNumericAccessCode($code);
                $Proj = new Project($_GET['pid']);
                $twilio_from_number = $Proj->project['twilio_from_number'];
                $twilio_multiple_sms_behavior = $Proj->project['twilio_multiple_sms_behavior'];
                // Remove the access code from the db table since we're about to initiate the call (so we no longer need it)
                TwilioRC::deleteSmsAccessCodeFromPhoneNumber($_POST['From'], $twilio_from_number,
                                ($twilio_multiple_sms_behavior == 'OVERWRITE' ? null : $_SESSION['survey_access_code']));
                // Redirect to the correct page to make the call to the respondent
                redirect(APP_PATH_SURVEY_FULL . "index.php?s=$hash&action=init&delivery_type=VOICE_INITIATE&phone=".$_POST['From']."&__passthru=".urlencode("Surveys/twilio_initiate_call_sms.php"));
                /**
                // Instantiate a client to Twilio's REST API
                $twilioClient = TwilioRC::client();
                // Set voice and language for all statements in call
                $language = TwilioRC::getLanguage();
                $voice = TwilioRC::getVoiceGender();
                // Set the survey URL that Twilio will make the request to
                $question_url = APP_PATH_SURVEY_FULL . "?s={$_GET['s']}&voice=$voice&language=$language";
                // Get number
                $number_to_call = preg_replace("/[^0-9]/", "", $_POST['From']);
                // Obtain project_id via the access codes
                $_GET['pid'] = TwilioRC::getProjectIdFromNumericAccessCode($code);
                $Proj = new Project($_GET['pid']);
                $twilio_from_number = $Proj->project['twilio_from_number'];
                // Call the phone number
                try {
                    // Remove access code from session
                    unset($_SESSION['survey_access_code']);
                    // Create hash so that we can add it to callback url
                    $callback_hash = generateRandomHash(50);
                    $call = $twilioClient->account->calls->create(Messaging::formatNumber($twilio_from_number), Messaging::formatNumber($number_to_call), $question_url, array(
                        "StatusCallback" => APP_PATH_SURVEY_FULL . "?__sid_hash=$callback_hash",
                        "FallbackUrl" => APP_PATH_SURVEY_FULL . "?__sid_hash=$callback_hash&__error=1",
                        "IfMachine"=>"Continue"
                    ));
                    // Add the sid and sid_hash to the db table so that we can delete the log for this event once it has completed
                    TwilioRC::addEraseCall($_GET['pid'], $call->sid, $callback_hash);
                } catch (Exception $e) { }
                */
                // Stop here
                exit;
            }
		}
		// Return hash
		return $hash;
	}

    // Set survey invitation preference on all events/surveys for a given record. Return boolean on success.
	public static function setInvitationPreferenceByParticipantId($participant_id, $delivery_preference)
	{
		// Get record name, project_id, survey_id, and event_id
		$sql = "select s.project_id, r.record, p.survey_id, p.event_id, r.instance
			from redcap_surveys_participants p, redcap_surveys_response r, redcap_surveys s
			where p.participant_id = '".db_escape($participant_id)."' and r.participant_id = p.participant_id
			and s.survey_id = p.survey_id limit 1";
		$q = db_query($sql);
		$row = db_fetch_assoc($q);

		// Seed rows in participants table, if needed
		$Proj = new Project($row['project_id']);
		// Get first event_id in the current arm using the given event_id
		$first_event_id = $Proj->getFirstEventIdInArmByEventId($row['event_id']);
		// Get first survey_id
		$first_survey_id = $Proj->firstFormSurveyId;
		// Is this the first event and first survey?
		$is_first_survey_event = ($first_event_id == $row['event_id'] && $first_survey_id == $row['survey_id']);
		// Make sure to seed the participant row of the first event and first survey, just in case
		if (!$is_first_survey_event && $row['record'] != '' && $first_survey_id != '') {
			Survey::getFollowupSurveyParticipantIdHash($first_survey_id, $row['record'], $first_event_id, false, $row['instance']);
		}

		// Update the delivery preference in all survey tables
		$sql1 = "update redcap_surveys_participants set delivery_preference = '".db_escape($delivery_preference)."'
			    where participant_id = '".db_escape($participant_id)."'";
		$sql2 = "update redcap_surveys_participants p, redcap_surveys_response r, redcap_surveys s, redcap_surveys t,
                redcap_surveys_participants a, redcap_surveys_response b
                set a.delivery_preference = '".db_escape($delivery_preference)."'
                where p.participant_id = '".db_escape($participant_id)."' and r.participant_id = p.participant_id
                and s.survey_id = p.survey_id and s.project_id = t.project_id and t.survey_id = a.survey_id
                and a.participant_id = b.participant_id and b.record = r.record";
		$success = (db_query($sql1) && db_query($sql2));

		// Logging
		if ($success) {
		    Logging::logEvent("$sql1;\n$sql2","redcap_surveys_participants","MANAGE",$row['record'],"participant_id = $participant_id",
                              "Change participant invitation preference\n(record: {$row['record']}, preference: $delivery_preference)");
		}

		// Return boolean on success
		return $success;
	}

	// Return participant id by providing a record/survey_id/event_id
    public static function getParticipantIdFromRecordSurveyEvent($record, $survey_id, $event_id, $instance=1)
    {
        if (!isinteger($instance) || $instance < 1) $instance = 1;
        // Seed the table, if necessary
		self::getFollowupSurveyParticipantIdHash($survey_id, $record, $event_id, false, $instance);
        // Get participant id from table
		$sql = "select p.participant_id
                from redcap_surveys_participants p, redcap_surveys_response r
                where p.survey_id = '".db_escape($survey_id)."' and p.event_id = '".db_escape($event_id)."'
                and r.record = '".db_escape($record)."' and r.instance = '".db_escape($instance)."' 
                and r.participant_id = p.participant_id and p.participant_email is not null limit 1";
		$q = db_query($sql);
		return db_num_rows($q) ? db_result($q, 0) : null;
    }


	// Get the Twilio delivery invitation preference data value for the mapped field
	public static function getDeliveryPreferenceFieldMapDataValue($project_id, $record)
	{
	    $Proj = new Project($project_id);
		// Default value
		$val = '';
		// If set, get value for this record
		if ($Proj->project['twilio_delivery_preference_field_map'] != '')
		{
			// Query the field for value
			$sql = "select value from ".\Records::getDataTable(PROJECT_ID)." where field_name = '{$Proj->project['twilio_delivery_preference_field_map']}' and project_id = " . PROJECT_ID . "
					and record = '" . db_escape($record) . "' and event_id = " . $Proj->getFirstEventIdArm(getArm()) . " and value != '' limit 1";
			$q = db_query($sql);
			if (db_num_rows($q) > 0) {
				// Set the value
				$val = db_result($q, 0);
			}
		}
		// Return value
		return $val;
	}

	// Return array of available delivery methods for surveys (e.g. email, sms_invite, voice_initiate, sms_initiate).
	// To be used as drop-down list options.
	public static function getDeliveryMethods($addParticipantPrefOption=false, $addDropdownGroups=false, $appendPreferenceTextToOption=null, 
                                              $addEmailOption=true, $project_id=null, $returnAllTwilioOptions=false)
	{
		global $lang;
        $Proj = new Project(isinteger($project_id) ? $project_id : PROJECT_ID);
        $twilio_enabled = $Proj->project['twilio_enabled'];
        $twilio_option_voice_initiate = $Proj->project['twilio_option_voice_initiate'];
        $twilio_option_sms_initiate = $Proj->project['twilio_option_sms_initiate'];
        $twilio_option_sms_invite_make_call = $Proj->project['twilio_option_sms_invite_make_call'];
        $twilio_option_sms_invite_receive_call = $Proj->project['twilio_option_sms_invite_receive_call'];
        $twilio_option_sms_invite_web = $Proj->project['twilio_option_sms_invite_web'];
		// Add array of delivery methods (email by default)
		$delivery_methods = array();
		// Email option
		if ($returnAllTwilioOptions || $addEmailOption) {
			$delivery_methods[$lang['survey_804']]['EMAIL'] = $lang['survey_688'] .
										 ($appendPreferenceTextToOption == 'EMAIL' ? " " . $lang['survey_782'] : '');
		}
		// If using Twilio, add the SMS/Voice choices
		if ($twilio_enabled) {
			if ($returnAllTwilioOptions || $twilio_option_sms_invite_web) {
				$delivery_methods[$lang['survey_804']]['SMS_INVITE_WEB'] = $lang['survey_955'] .
													($appendPreferenceTextToOption == 'SMS_INVITE_WEB' ? " " . $lang['survey_782'] : '');
			}
			if ($returnAllTwilioOptions || $twilio_option_sms_initiate) {
				$delivery_methods[$lang['survey_803']]['SMS_INITIATE'] = $lang['survey_767'] .
													($appendPreferenceTextToOption == 'SMS_INITIATE' ? " " . $lang['survey_782'] : '');
			}
			if (($Proj->messaging_provider == Messaging::PROVIDER_TWILIO) && ($returnAllTwilioOptions || $twilio_option_voice_initiate)) {
				$delivery_methods[$lang['survey_802']]['VOICE_INITIATE'] = $lang['survey_884'] .
													  ($appendPreferenceTextToOption == 'VOICE_INITIATE' ? " " . $lang['survey_782'] : '');
			}
			if (($Proj->messaging_provider == Messaging::PROVIDER_TWILIO) && ($returnAllTwilioOptions || $twilio_option_sms_invite_make_call)) {
				$delivery_methods[$lang['survey_802']]['SMS_INVITE_MAKE_CALL'] = $lang['survey_690'] .
												  ($appendPreferenceTextToOption == 'SMS_INVITE_MAKE_CALL' ? " " . $lang['survey_782'] : '');
			}
			if (($Proj->messaging_provider == Messaging::PROVIDER_TWILIO) && ($returnAllTwilioOptions || $twilio_option_sms_invite_receive_call)) {
				$delivery_methods[$lang['survey_802']]['SMS_INVITE_RECEIVE_CALL'] = $lang['survey_801'] .
												  ($appendPreferenceTextToOption == 'SMS_INVITE_RECEIVE_CALL' ? " " . $lang['survey_782'] : '');
			}
		}
		// Add participant's preference as option?
		if ($addParticipantPrefOption) {
			$delivery_methods[$lang['survey_805']]['PARTICIPANT_PREF'] = $lang['survey_768'];
		}
		// If we're not adding the optgroups, then remove them
		if (!$addDropdownGroups) {
			$delivery_methods2 = array();
			foreach ($delivery_methods as $key=>$attr) {
				if (is_array($attr)) {
					foreach ($attr as $key2=>$attr2) {
						$delivery_methods2[$key2] = $attr2;
					}
				} else {
					$delivery_methods2[$key] = $attr;
				}
			}
			$delivery_methods = $delivery_methods2;
		}
		// Return array
		return $delivery_methods;
	}


	// Display the Survey Code form for entering the code
	public static function displayAccessCodeForm($displayErrorMsg=false)
	{
		return RCView::div(
					array(
						'style' => 'margin:-32px 0 5px;text-align:right;',
						'id' => 'project-redcap-link'
					),
					RCView::a(array('href'=>'https://projectredcap.org/', 'target'=>'_blank'),
						RCView::img(array('src'=>'redcap-logo-small.png'))
					)
				) .	RCView::form(array('id'=>'survey_code_form', 'style'=>'font-weight:bold;margin:0 0 10px;font-size:16px;', 'action'=>$_SERVER['REQUEST_URI'], 'enctype'=>'multipart/form-data', 'target'=>'_self', 'method'=>'post'),
					// Error msg
					(!$displayErrorMsg ? '' :
						RCView::div(array(
							'class'=>'red', 
							'style'=>'font-size:14px;margin-top:20px;margin-bottom:20px;padding:10px 15px 12px;'),
							RCView::img(array('src'=>'exclamation.png')) .
							RCView::tt("survey_1359") // <b>ERROR:</b> The code entered was not valid! Please try again.
						)
					) .
					RCView::div(array(),
						RCView::tt("survey_619") . // Please enter your access code to begin the survey
						RCView::text(array('name'=>'code', 'maxlength'=>'20', 'class'=>'x-form-text x-form-field', 'style'=>'margin:0 4px 0 10px;font-size:16px;width:120px;padding:4px 6px;')) .
						RCView::button(array('class'=>'jqbutton', 'onclick'=>"
							var ob = $('input[name=\"code\"]');
							ob.val( trim(ob.val()) );
							if (ob.val() == '') {
								simpleDialog(window.lang.survey_634);
								return false;
							}
							$('#survey_code_form').submit();
						"), RCView::tt("survey_200")) // Submit
					) .
					RCView::div(array('style'=>'font-size:14px;font-weight:normal;color:#777;margin-top:30px;margin-bottom:50px;'),
						RCView::tt("survey_642") // Please note that the access code is *not* case sensitive.
					)
				) .
				addLangToJS(array("survey_634"), false) . // Please enter the survey access code given to you.
				MultiLanguage::displayAccessCodeForm() .
				"<style type='text/css'>
					#footer { display:none; }
				</style>
				<script type='text/javascript'>
					$(function(){
						$('input[name=\"code\"]').focus();
					});
				</script>"; 
	}


	// OBTAIN HTML ICON FOR A GIVEN SMS/VOICE DELIVERY PREFERENCE IN THE PARTICIPANT LIST
	public static function getDeliveryPrefIcon($delivery_pref)
	{
		// Deliever preference
		if ($delivery_pref == 'VOICE_INITIATE') {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'phone.gif', 
				'data-rc-lang-attrs'=>'title=survey_884',
				'title'=>RCView::getLangStringByKey("survey_884")
			));
		} else if ($delivery_pref == 'SMS_INITIATE') {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'balloons_box.png', 
				'data-rc-lang-attrs'=>'title=survey_767',
				'title'=>RCView::getLangStringByKey("survey_767")
			));
		} else if ($delivery_pref == 'SMS_INVITE_MAKE_CALL') {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'balloon_phone.gif',
				'data-rc-lang-attrs'=>'title=survey_690',
				'title'=>RCView::getLangStringByKey("survey_690")
			));
		} else if ($delivery_pref == 'SMS_INVITE_RECEIVE_CALL') {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'balloon_phone_receive.gif',
				'data-rc-lang-attrs'=>'title=survey_801',
				'title'=>RCView::getLangStringByKey("survey_801")
			));
		} else if ($delivery_pref == 'SMS_INVITE_WEB') {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'balloon_link.gif',
				'data-rc-lang-attrs'=>'title=survey_955',
				'title'=>RCView::getLangStringByKey("survey_955")
			));
		} else {
			$deliv_pref_icon = RCView::img(array(
				'src'=>'email.png',
				'data-rc-lang-attrs'=>'title=global_33',
				'title'=>RCView::getLangStringByKey("global_33")
			));
		}
		return $deliv_pref_icon;
	}


	// DETERMINE THE NEXT SURVEY URL IN THE SAME EVENT AND RETURN URL OR NULL
	public static function getAutoContinueSurveyUrl($record, $current_form_name, $event_id, $instance=1)
	{
		global $Proj;
		// Get all forms from this event
		$forms_array = $Proj->eventsForms[$event_id];

		// Get all forms after the current one
		$forms_array = array_slice($forms_array, array_search($current_form_name, $forms_array) + 1);

		// Create array of valid surveys remaining
		$next_surveys = array();
		foreach ($forms_array as $k => $form) {
			$this_survey_id = isset($Proj->forms[$form]['survey_id']) ? $Proj->forms[$form]['survey_id'] : 0;
			if ($this_survey_id) {
				// Check FDL access if so set
				if (FormDisplayLogic::isSetApplyToSurveyAutocontinue($Proj->project_id) && 
					FormDisplayLogic::checkFormAccess($Proj->project_id, $record, $event_id, $form, $instance) !== true) {
					continue;
				}
				$this_survey = $Proj->surveys[$this_survey_id];
				// Check it is enabled
				if ($this_survey['survey_enabled'] == 1 && 
					// Check response limit (if enabled) - do not do AutoContinue for this survey/event if hit limit already
					!self::reachedResponseLimit($Proj->project_id, $this_survey_id, $event_id)
				) {
					// Check it isn't expired
					if (!($this_survey['survey_expiration'] != '' && $this_survey['survey_expiration'] <= NOW)) {
						$next_surveys[] = $this_survey_id;
					}
				}
			}
		}

		// Is there another valid survey in this event
		if (empty($next_surveys)) {
			$next_survey_url = null;
		} else {
			$next_survey_id = current($next_surveys);
            $next_form_name = $Proj->surveys[$next_survey_id]['form_name'];
            // Repeating Forms ONLY: Get count of existing instances and find next instance number
            if ($Proj->isRepeatingForm($event_id, $next_form_name)) {
                list ($instanceTotal, $instanceMax) = RepeatInstance::getRepeatFormInstanceMaxCount($record, $event_id, $next_form_name, $Proj);
                $instance = $instanceMax + 1;
            } elseif (!$Proj->isRepeatingEvent($event_id)) {
                // If next form/event is not a repeating form or repeating event, always use instance 1
                $instance = 1;
            }
			// Use survey_functions to generate a hash for this survey
			list($next_participant_id, $next_hash) = self::getFollowupSurveyParticipantIdHash($next_survey_id, $record, $event_id, false, $instance);
			$next_survey_url = APP_PATH_SURVEY_FULL . "?s=$next_hash";
		}
		return $next_survey_url;
	}


	// OBTAIN ARRAY OF ALL LANGUAGES AVAILABLE FOR GOOGLE TEXT-TO-SPEECH API
	public static function getTextToSpeechLanguages()
	{ global  $lang;
		return array(
			'pt-BR_IsabelaV3Voice'		=> $lang['survey_1562'], // Brazilian Portuguese (Female)
			'en-GB_CharlotteV3Voice' 	=> $lang['survey_1563'], // English - United Kingdom (Female)
			'en-GB_JamesV3Voice' 		=> $lang['survey_1564'], // English - United Kingdom (Male)
			'en-US_AllisonV3Voice' 		=> $lang['survey_1565'], // English - United States (Female)
			'en-US_HenryV3Voice' 		=> $lang['survey_1566'], // English - United States (Male)
			'fr-CA_LouiseV3Voice' 		=> $lang['survey_1577'], // French - Canadian (Female)
			'fr-FR_NicolasV3Voice'	 	=> $lang['survey_1567'], // French - France (Male)
			'fr-FR_ReneeV3Voice' 		=> $lang['survey_1568'], // French - France (Female)
			'de-DE_BirgitV3Voice' 		=> $lang['survey_1569'], // German (Female)
			'de-DE_DieterV3Voice' 		=> $lang['survey_1570'], // German (Male)
			'it-IT_FrancescaV3Voice' 	=> $lang['survey_1571'], // Italian (Female)
			'ja-JP_EmiV3Voice'		 	=> $lang['survey_1572'], // Japanese (Female)
			'ko-KR_JinV3Voice'		 	=> $lang['survey_1579'], // Korean (Female)
			'nl-NL_MerelV3Voice'	 	=> $lang['survey_1578'], // Netherlander (Female)
			'es-ES_EnriqueV3Voice' 		=> $lang['survey_1573'], // Spanish - Castilian (Male)
			'es-ES_LauraV3Voice' 		=> $lang['survey_1574'], // Spanish - Castilian (Female)
			'es-LA_SofiaV3Voice' 		=> $lang['survey_1575'], // Spanish - Latin American (Female)
			'es-US_SofiaV3Voice' 		=> $lang['survey_1576']  // Spanish - North American (Female)
		);
	}


	// Text Size: See appropriage text size by outputting CSS file
	public static function setTextSize($text_size, $HtmlPageObject)
	{
		global $isMobileDevice;
		// Init var
		if ($text_size == '') $text_size = 0;
		// For mobile devices, increase the font one step for better viewability
		if ($isMobileDevice) $text_size++;
		// Set CSS file
		if ($text_size == '1') {
			$HtmlPageObject->addStylesheet("survey_text_large.css", 'screen,print');
		} elseif ($text_size > 1) {
			$HtmlPageObject->addStylesheet("survey_text_very_large.css", 'screen,print');
		}
		// Return HTML object
		return $HtmlPageObject;
	}


	// Get list of index numbers from getFonts() where the font is non-Latin
	public static function getNonLatinFontIndex()
	{
		return array(12, 13, 14, 15);
	}


	// Get list of survey themes
	public static function getFonts($font=null)
	{
		// Array of all available survey fonts
		$fonts = array();
		// Latin fonts
		$fonts[16] = "'Open Sans',Helvetica,Arial,sans-serif";
		$fonts[0] = "'Arial Black',Gadget,sans-serif";
		$fonts[1] = "'Comic Sans','Comic Sans MS',Chalkboard,'ChalkboardSE-Regular',sans-serif";
		$fonts[2] = "'Courier New',Courier,monospace";
		$fonts[3] = "Georgia,serif";
		$fonts[4] = "'Lucida Console',Monaco,monospace";
		$fonts[5] = "'Lucida Sans Unicode','Lucida Grande',sans-serif";
		$fonts[6] = "'Palatino Linotype','Book Antiqua',Palatino,serif";
		$fonts[7] = "Tahoma,Geneva,sans-serif";
		$fonts[8] = "'Times New Roman',Times,serif";
		$fonts[9] = "'Trebuchet MS',Helvetica,sans-serif";
		$fonts[10] = "Verdana,Geneva,sans-serif";
		$fonts[11] = "'Gill Sans',Geneva,sans-serif";
		// Non-Latin fonts
		$fonts[12] = "Meiryo,sans-serif";
		$fonts[13] = "'Meiryo UI',sans-serif";
		$fonts[14] = "'Hiragino Kaku Gothic Pro',sans-serif";
		$fonts[15] = "'MS PGothic',Osaka,Arial,sans-serif";
		// Set default font if returning single font and invalid parameter is passed
		if ($font !== null && !isset($fonts[$font])) $font = 0;
		// Return single font
		if ($font !== null) return $fonts[$font];
		// Return array
		return $fonts;
	}


	// Survey Theme: Provide $theme as /redcap/themes/ subdirectory, and output CSS and JS files inside that directory
	public static function applyFont($font_num, $HtmlPageObject)
	{
		if (!is_numeric($font_num)) {
			// Default font
			$font = 'Arial';
		} else {
			// Validate font
			$font = self::getFonts($font_num);
		}
		// Add CSS to HtmlObject
		$HtmlPageObject->addInlineStyle("body * { font-family: $font !important; }");
		// Return HtmlPage object
		return $HtmlPageObject;
	}


	// Get list of user-saved survey themes
	public static function getUserThemes($selected_theme=null)
	{
		// Put themes into array
		$themes_array = array();
		// Get themes for this user
		if ($selected_theme === null && defined("USERID")) {
			$sql = "select t.* from redcap_surveys_themes t, redcap_user_information i
					where i.ui_id = t.ui_id and i.username = '".db_escape(USERID)."' order by t.theme_name";
		} else {
			$sql = "select t.* from redcap_surveys_themes t where t.theme_id = '".db_escape($selected_theme)."' order by t.theme_name";
		}
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$theme_id = $row['theme_id'];
			unset($row['ui_id'], $row['theme_id']);
			// Prepend color values with hash
			foreach ($row as $attr_name=>$attr_val) {
				if ($attr_name != 'theme_name' && $attr_val != '') {
					$row[$attr_name] = "#$attr_val";
				}
			}
			$themes_array[$theme_id] = $row;
		}
		// Return array of user's themes
		return $themes_array;
	}


	// Return boolean regarding if current user has one or more saved custom survey themes
	public static function userHasCustomThemes($theme_id=null, $userid=null)
	{
		$sql = "select 1 from redcap_surveys_themes t, redcap_user_information i
				where i.ui_id = t.ui_id and i.username = '".db_escape(USERID)."' ";
		if (is_numeric($theme_id)) {
			$sql .= "and t.theme_id = $theme_id";
		} else {
			$sql .= "limit 1";
		}
		$q = db_query($sql);
		return (db_num_rows($q) > 0);
	}


	// Get utilization of a user's saved survey theme
	// Return array of user's themes with theme_id as key where value = count of # surveys using the theme
	public static function getUserThemeUtilization($username)
	{
		$sql = "select t.theme_id, count(1) as thiscount
				from redcap_surveys_themes t, redcap_user_information i, redcap_surveys s, redcap_projects p
				where i.ui_id = t.ui_id and s.theme = t.theme_id and i.username = '".db_escape($username)."'
				and s.project_id = p.project_id and p.date_deleted is null
				and s.form_name = (select m.form_name from redcap_metadata m where m.project_id = p.project_id and s.form_name = m.form_name limit 1)
				group by t.theme_id";
		$q = db_query($sql);
		$themeCounts = array();
		while ($row = db_fetch_assoc($q)) {
			$themeCounts[$row['theme_id']] = $row['thiscount'];
		}
		return $themeCounts;
	}


	// Get list of survey themes
	public static function getThemes($theme=null, $return_attributes=true, $return_user_themes=false)
	{
		// Put themes into array
		$themes_array = $user_themes = array();
		$preset_themes = self::getPresetThemes();
		// Obtain all themes saved by user
		if ($return_user_themes) {
			$user_themes = self::getUserThemes($theme);
			$preset_themes = $preset_themes+$user_themes;
		}
		// Obtain all themes (and attributes, if applicable)
		foreach ($preset_themes as $this_theme=>$theme_attr) {
			// Add theme to array
			if ($return_attributes) {
				$themes_array[$this_theme] = $theme_attr;
			} else {
				$themes_array[$this_theme] = $theme_attr['theme_name'];
			}
			// If $theme parameter was provided, then just return this theme attributes
			if ($theme !== null && $this_theme."" === $theme."") return $themes_array[$this_theme];
		}
		// Return array
		asort($themes_array);
		return $themes_array;
	}


	// Survey Theme: Provide $theme as /redcap/themes/ subdirectory, and output CSS and JS files inside that directory
	public static function applyTheme($theme, $HtmlPageObject, $custom_attr=array())
	{
		// Get the current theme
		$theme_attr = self::getThemes($theme, true, true);
		if ($theme_attr === null && empty($custom_attr)) return $HtmlPageObject;
		// Add any customizations on top of theme and prepend color values with hash
		if ($theme == '' && !empty($custom_attr)) {
			$theme_attr = array();
			foreach ($custom_attr as $attr_name=>$attr_val) {
				if ($attr_val != '') $theme_attr[$attr_name] = "#$attr_val";
			}
		}
		// Convert theme attr into CSS
		$css = self::getThemeCSS($theme_attr);
		// Add CSS to HtmlObject
		$HtmlPageObject->addInlineStyle($css);
		// Return HtmlPage object
		return $HtmlPageObject;
	}



	// Convert survey theme attributes into CSS
	public static function getThemeCSS($theme_attr)
	{
		$css = "";
		if (isset($theme_attr['theme_bg_page'])) {
			$css .= "body { background-image: none; background-color: {$theme_attr['theme_bg_page']}; }\n";
			// Determine a white or black footer based upon body bg color
			$footer_color = (is_numeric(substr($theme_attr['theme_bg_page'], 1, 1))) ? "#FFFFFF" : "#000000";
			$css .= "#footer, #footer a { color: $footer_color !important; }\n";
		}
		if (isset($theme_attr['theme_text_buttons'])) {
			$css .= "button, .btn-fileupload {color: {$theme_attr['theme_text_buttons']} !important; }\n";
			$css .= ".btn-fileupload {background-color: #e6e6e6 !important; border-color: #999 !important; }\n";
			$css .= ".btn-fileupload:hover {background-color: #ededed !important; border-color: #ccc !important; }\n";
		}
		if (isset($theme_attr['theme_text_question'])) {
			$css .= "#econsent_confirm_instr2, #questiontable td, .floatMtxHdr td { color: {$theme_attr['theme_text_question']}; }\n";
			$css .= ".matrix_first_col_hdr { color: {$theme_attr['theme_text_question']} !important; }\n";
			// Enhanced choices radios/checkboxes
			$css .= "div.enhancedchoice label { color: {$theme_attr['theme_text_question']} !important; border-color: {$theme_attr['theme_text_question']} !important; }\n";
			$css .= "div.enhancedchoice label.selectedradio, div.enhancedchoice label.selectedchkbox, div.enhancedchoice label.hover:hover { background-color: {$theme_attr['theme_text_question']}; }\n";
		}
		if (isset($theme_attr['theme_bg_question'])) {
			$css .= "#return_instructions, #econsent_confirm_instr2, #questiontable>tbody>tr>td, #questiontable td.labelmatrix>table>tbody>tr>td, .floatMtxHdr, .floatMtxHdr td { background-image: none; background-color: {$theme_attr['theme_bg_question']}; }\n";
			// Enhanced choices radios/checkboxes
			$css .= "div.enhancedchoice label { background-color: {$theme_attr['theme_bg_question']}; }\n";
			$css .= "div.enhancedchoice label.selectedradio, div.enhancedchoice label.selectedchkbox, div.enhancedchoice label.hover:hover { !important; border-color: {$theme_attr['theme_bg_question']} !important; }\n";
			$css .= "div.enhancedchoice label.selectedradio, div.enhancedchoice label.selectedradio a, div.enhancedchoice label.selectedchkbox, div.enhancedchoice label.selectedchkbox a, div.enhancedchoice label.hover:hover, div.enhancedchoice label.hover:hover a { color: {$theme_attr['theme_bg_question']} !important; }\n";
		}
		if (isset($theme_attr['theme_text_sectionheader'])) {
			$css .= "#econsent_confirm_checkbox_div, .header { color: {$theme_attr['theme_text_sectionheader']} !important; }\n";
		}
		if (isset($theme_attr['theme_bg_sectionheader'])) {
			$css .= "#econsent_confirm_checkbox_div, .header { background-image: none; border: none; background-color: {$theme_attr['theme_bg_sectionheader']} !important; }\n";
		}
		if (isset($theme_attr['theme_text_title'])) {
			$css .= "#surveyinstructions-reveal a, #surveypagenum, #surveytitle, #surveyinstructions, #surveyinstructions p, #surveyinstructions div, #surveyacknowledgment, #surveyacknowledgment p, #surveyacknowledgment div { color: {$theme_attr['theme_text_title']}; } \n";
			$css .= "#return_corner a, #return_corner span, #return_corner i, #survey_queue_corner a, #dpop .popup-contents, #dpop .popup-contents span, #dpop .popup-contents i { color: {$theme_attr['theme_text_title']} !important; } \n";
			// Multilanguage selection buttons
            $css .= ".mlm-switcher button.btn-outline-secondary { color: {$theme_attr['theme_text_title']} !important; border-color: {$theme_attr['theme_text_title']} !important; } \n";
			$css .= ".mlm-switcher button.btn-primary { background-color: {$theme_attr['theme_text_title']} !important; } \n";
		}
		if (isset($theme_attr['theme_bg_title'])) {
			$css .= "#pagecontent, #container, #surveytitle, #surveyinstructions, #surveyinstructions p, #surveyinstructions div, #surveyacknowledgment, #surveyacknowledgment p, #surveyacknowledgment div { background-image: none; background-color: {$theme_attr['theme_bg_title']}; } \n";
			// Determine a white or black footer based upon body bg color
			$changeFont_color = (is_numeric(substr($theme_attr['theme_bg_title'], 1, 1))) ? "#FFFFFF" : "#000000";
			$css .= "#changeFont { color: $changeFont_color !important; }\n";
			// Multilanguage selection buttons
			$css .= ".mlm-switcher button.btn-primary { color: {$theme_attr['theme_bg_title']} !important; border-color: {$theme_attr['theme_bg_title']} !important; } \n";
		}
		if (isset($theme_attr['misc_css'])) {
			$css .= $theme_attr['misc_css'] . "\n";
		}
		return $css;
	}


	// Get Preset Survey Theme attributes
	public static function getPresetThemes($theme=null)
	{
		// Add preset themes to array
		$themes = array();
		$sql = "select * from redcap_surveys_themes where ui_id is null";
		if ($theme !== null) $sql .= " and theme_id = '".db_escape($theme)."'";
		$sql .= " order by theme_name";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$theme_id = $row['theme_id'];
			unset($row['ui_id'], $row['theme_id']);
			// Prepend color values with hash
			foreach ($row as $attr_name=>$attr_val) {
				if ($attr_name != 'theme_name' && $attr_val != '') {
					$row[$attr_name] = "#$attr_val";
				}
			}
			$themes[$theme_id] = $row;
		}
		// If $theme parameter is passed but is invalid, then return NULL
		if ($theme !== null && !isset($themes[$theme])) return null;
		// If $theme parameter is passed, return only its attributes
		if ($theme !== null && isset($themes[$theme])) return $themes[$theme];
		// Return themes array
		return $themes;
	}


	// Render drop-down list of Survey Themes
	public static function renderSurveyThemeDropdown($selected_theme='', $disabled=false)
	{
		// Default theme's attributes
		$theme_attr_json_default = json_encode(array(
			'theme_text_buttons'=>'#000000', 'theme_bg_page'=>'#1A1A1A',
			'theme_text_title'=>'#000000', 'theme_bg_title'=>'#FFFFFF',
			'theme_text_sectionheader'=>'#000000', 'theme_bg_sectionheader'=>'#BCCFE8',
			'theme_text_question'=>'#000000', 'theme_bg_question'=>'#F3F3F3'
		));
		// Get survey theme attributes and set them as JSON
		$themes_attr_json = array();
		$survey_themes = self::getThemes(null, true, true);
		$user_themes = self::getUserThemes();
		$hasUserThemes = (!empty($user_themes));
		foreach ($survey_themes as $this_theme=>$attr) {
			unset($attr['theme_name']);
			$themes_attr_json[$this_theme] = json_encode($attr);
		}
		// If the currently saved theme is a user's theme but does NOT belong to the CURRENT user, then add to end of drop-down list
		$hasOtherUserThemes = false;
		if ($selected_theme != '' && !isset($survey_themes[$selected_theme])) {
			$other_user_theme = self::getThemes($selected_theme, true, true);
			$hasOtherUserThemes = true;
		}
		// Build drop-down options for survey theme choice
		$this_selected = ($selected_theme == '') ? " selected" : "";
		$survey_themes_opts = $survey_themes_user_opts = $survey_themes_other_user_opts = "";
		if ($hasUserThemes) {
			$survey_themes_user_opts = "<optgroup data-rc-lang-attrs='label=survey_1039' label='".RCView::tt_js("survey_1039")."'>";
		}
		if ($hasUserThemes || $hasOtherUserThemes) {
			$survey_themes_opts = "<optgroup data-rc-lang-attrs='label=survey_1038' label='".RCView::tt_js("survey_1038")."'>";
		}
		if ($hasOtherUserThemes) {
			$survey_themes_other_user_opts = "<optgroup data-rc-lang-attrs='label=survey_1040' label='".RCView::tt_js("survey_1040")."'>";
		}
		$survey_themes_opts .= "<option value='' attr='".$theme_attr_json_default."'$this_selected data-rc-lang='survey_1017'>".RCView::getLangStringByKey("survey_1017")."</option>";
		foreach ($survey_themes as $this_theme=>$attr) {
			$this_theme_name = $attr['theme_name'];
			$this_selected = ($this_theme == $selected_theme) ? " selected" : "";
			if (isset($user_themes[$this_theme])) {
				$survey_themes_user_opts .= "<option value='$this_theme' attr='".$themes_attr_json[$this_theme]."'$this_selected>".RCView::escape($this_theme_name)."</option>";
			} else {
				$survey_themes_opts .= "<option value='$this_theme' attr='".$themes_attr_json[$this_theme]."'$this_selected>".RCView::escape($this_theme_name)."</option>";
			}
		}
		// If theme was created by another user (other than current user), then add at end of drop-down list
		if (!empty($other_user_theme)) {
			$this_theme_name = $other_user_theme['theme_name'];
			unset($other_user_theme['theme_name']);
			$theme_attr_json_other_user = json_encode($other_user_theme);
			$survey_themes_other_user_opts .= "<option value='$selected_theme' attr='".$theme_attr_json_other_user."' selected>".RCView::escape($this_theme_name)."</option>";
		}
		$survey_themes_opts .= $survey_themes_user_opts . $survey_themes_other_user_opts;
		// Return HTML for drop-down
		return "<select id='theme' name='theme' class='x-form-text x-form-field' style='' "
			 . "onchange='updateThemeIframe()'".($disabled ? ' disabled' : '').">$survey_themes_opts</select>";
	}
	
	// Serially-running AJAX request for when user opens a survey via data entry form to check if the survey has been modified since the survey was
	// initially opened. This prevents users from closing the survey tab to return to the data entry form, save it, and thus mistakenly
	// overwrite all the survey responses.
	public static function openSurveyValuesChanged($time_opened="", $survey_hash="")
	{
		$sql = "select 1 from redcap_surveys_participants p, redcap_surveys_response r 
				where p.participant_id = r.participant_id and p.participant_email is not null 
				and p.hash = '".prep($survey_hash)."' and ((r.first_submit_time is not null and r.first_submit_time > '".prep($time_opened)."')
				or (r.completion_time is not null and r.completion_time > '".prep($time_opened)."')) limit 1";
		$q = db_query($sql);
		// Return 1 if values have not changed since the survey was opened, else return 0 so we can warn user
		return (db_num_rows($q) > 0) ? '0' : '1';
	}
	
	// Count survey responses for a given survey (exclude data entered via data entry form)
	public static function countResponses($survey_id, $event_id, $include_partials="1")
	{
		$sql = "select count(distinct(r.record)) from redcap_surveys_participants p, redcap_surveys_response r 
				where p.participant_id = r.participant_id and p.survey_id = '".prep($survey_id)."'
				and p.event_id = '".prep($event_id)."' and ";
		$sql .= ($include_partials != '1') ? "r.completion_time is not null" : "r.first_submit_time is not null";
		$q = db_query($sql);
		// Return response count
		return db_result($q, 0);
	}
	
	// Check if Response Limit is enabled, and if so, check number of responses to display stop message to respondent
	public static function reachedResponseLimit($project_id, $survey_id, $event_id)
	{
		// Get Proj object
		$Proj = new Project($project_id);
		// Is response limit enabled?
		if (!(is_numeric($Proj->surveys[$survey_id]['response_limit']) && $Proj->surveys[$survey_id]['response_limit'] > 0)) return false;
		// Check response count
		$response_count = self::countResponses($survey_id, $event_id, $Proj->surveys[$survey_id]['response_limit_include_partials']);
		if ($response_count < $Proj->surveys[$survey_id]['response_limit']) return false;
		// We've hit the response limit, so display message to respondent
		return true;
	}
	
	// Calculate survey time limit's time limit in seconds, if enabled
	public static function calculateSurveyTimeLimit($days=0, $hours=0, $minutes=0) 
	{
		// Check temporal components
		if (!(is_numeric($days) && $days > 0)) $days = 0;
		if (!(is_numeric($hours) && $hours > 0)) $hours = 0;
		if (!(is_numeric($minutes) && $minutes > 0)) $minutes = 0;
		return ($days*24*3600 + $hours*3600 + $minutes*60);
	}
	
	// Calculate a survey respondent's time limit timestamp based on their first invite time.
	// Return FALSE if participant invitation is past the time limit.
	public static function checkSurveyTimeLimit($participant_id="", $days=0, $hours=0, $minutes=0) 
	{
		// Get time limit in seconds
		$timeLimitSeconds = self::calculateSurveyTimeLimit($days, $hours, $minutes);
		if ($timeLimitSeconds == 0) return true;
		// Check invite time
		$linkExpirationTimes = self::getLinkExpirationTimes(array($participant_id));
		$linkExpirationTime = $linkExpirationTimes[$participant_id];
		if ($linkExpirationTime == "") return true;
		// If initial survey invite time + time limit is not > now, then do nothing
		if (strtotime(NOW) < strtotime($linkExpirationTime)) return true;
		// We've hit the time limit, so display message to respondent
		return false;
	}
	
	// Get the initial invitation time of non-public survey links
	public static function getLinkExpirationTimes($participant_ids=array())
	{
		// Build placeholder array first
		$linkExpirationTimes = array();
		foreach ($participant_ids as $part_id) {
			$linkExpirationTimes[$part_id] = "";
		}
		// First, get any link expirations that are stored in the participant table
		$sql = "select p.participant_id, p.link_expiration from redcap_surveys_participants p
				where p.participant_email is not null and p.participant_id in (".prep_implode($participant_ids).") 
				and p.link_expiration is not null group by p.participant_id";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q)) {
			$linkExpirationTimes[$row['participant_id']] = $row['link_expiration'];
			// Remove from participant_id's array so that they are not used in the next query
			$thisPartKey = array_search($row['participant_id'], $participant_ids);
			unset($participant_ids[$thisPartKey]);
		}
		// Obtain initial send times of non-cached participants and convert to expiration times
		if (!empty($participant_ids)) 
		{
			// Store the survey-level time limit in an array so that we don't recalculate it for every participant
			$surveyTimeLimitSeconds = array();
			// Get initial send time
			$sql = "select p.participant_id, min(q.time_sent) as time_sent, s.survey_id, 
					s.survey_time_limit_days, s.survey_time_limit_hours, s.survey_time_limit_minutes
					from redcap_surveys_participants p, redcap_surveys_emails_recipients e, redcap_surveys_scheduler_queue q, redcap_surveys s		
					where p.participant_email is not null and e.participant_id = p.participant_id and p.survey_id = s.survey_id
					and q.email_recip_id = e.email_recip_id and q.time_sent is not null
                   	and p.participant_id in (".prep_implode($participant_ids).") group by p.survey_id, p.participant_id";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				// Calculate time limit in seconds for this survey
				if (isset($surveyTimeLimitSeconds[$row['survey_id']])) {
					$timeLimitSeconds = $surveyTimeLimitSeconds[$row['survey_id']];
				} else {
					$timeLimitSeconds = $surveyTimeLimitSeconds[$row['survey_id']] 
						= self::calculateSurveyTimeLimit($row['survey_time_limit_days'], $row['survey_time_limit_hours'], $row['survey_time_limit_minutes']);
				}
				// Convert initial send time to expiration time using time limit
				if ($timeLimitSeconds > 0) {
					$linkExpirationTime = $linkExpirationTimes[$row['participant_id']] = date("Y-m-d H:i:s", strtotime($row['time_sent']) + $timeLimitSeconds);
				} else {
					$linkExpirationTime = $linkExpirationTimes[$row['participant_id']] = "";
				}
				// Add to participant table to cache it for the future
				$sql = "update redcap_surveys_participants 
						set link_expiration = ".checkNull($linkExpirationTime).", link_expiration_override = 0 
						where participant_id = ".$row['participant_id'];
				db_query($sql);
			}
		}
		// Return send times array
		return $linkExpirationTimes;
	}
	
	// Change a participant's Link Expiration time (time limit)
	public static function changeLinkExpiration()
	{
		if (!isset($_POST['time_limit_expiration']) || !isset($_POST['participant_id']) || !is_numeric($_POST['participant_id'])) exit;
		// Change it
		$expiration = DateTimeRC::format_ts_to_ymd($_POST['time_limit_expiration']).":00";
		$sql = "update redcap_surveys_participants set link_expiration = '".db_escape($expiration)."', link_expiration_override = 1
				where participant_id = '".db_escape($_POST['participant_id'])."'";
		db_query($sql);
		// Display success message
		print 	RCView::div(array('class'=>'darkgreen'),
					RCView::img(array('src'=>'tick.png')) .
					RCView::tt("survey_1123") . " " .
					RCView::b(DateTimeRC::format_ts_from_ymd($expiration))
				);
	}
	
	// Display dialog for changing a participant's Link Expiration time (time limit)
	public static function changeLinkExpirationRenderDialog()
	{
		$init_survey_invite_times = self::getLinkExpirationTimes(array($_POST['participant_id']));
		$init_survey_invite_time = DateTimeRC::format_user_datetime($init_survey_invite_times[$_POST['participant_id']], 'Y-M-D_24', null, true);
		print 	RCView::div(array(),
					RCView::tt("survey_1122")
				) .
				RCView::div(array('style'=>'margin-top:15px;'), 
					RCView::b(RCView::tt("survey_1126")) . 
					RCView::span(array('id'=>'changeLinkExpirationEmailDup', 'style'=>'color:#A00000;margin-left:10px;'), '')
				) .
				RCView::div(array('style'=>'margin-top:15px;'),
					RCView::b(RCView::tt("survey_1125")) . 
					RCView::text(array('id'=>'time_limit_expiration', 'style'=>'margin-left:10px;width:90%;max-width:118px;', 'class'=>'x-form-text x-form-field',
						'value'=>$init_survey_invite_time)) .
					RCView::span(array('class'=>'df','style'=>'padding-left:5px;'), DateTimeRC::get_user_format_label().' H:M') .		
					// 'Expire it now' button
					RCView::span(array('style'=>'color:#777;margin:0 15px;'), '&ndash; '.RCView::tt("global_46").' &ndash;') .
					RCView::button(array('class'=>'btn btn-primaryrc btn-xs', 'style'=>'', 'onclick'=>"
						var timeLimitNow = getCurrentDate('datetime_'+user_date_format_validation)+' '+currentTime('both',0);
						timeLimitNow = timeLimitNow.replace(/-/g, user_date_format_delimiter);
						$('#time_limit_expiration').val(timeLimitNow).effect('highlight',{},2500);"), RCView::tt("survey_1127"))
				);
	}

    // Output the JavaScript for survey invitation checking for [survey-link] in compose text
    public static function renderCheckComposeForSurveyLink()
    {
		addLangToJS(array(
			"design_401", 
			"piping_48", 
			"piping_50", 
			"piping_51",
			"piping_74", 
			"survey_956", 
			"survey_1228", 
			"survey_1229", 
			"survey_1230", 
		));
        ?>
        <script type="text/javascript">
            // Reminder to add [survey-link] to email compose text
            function checkComposeForSurveyLink(ob) {
                var text = $(ob).val().trim();
                var select = $('select[name="delivery_type"]');
                // Detect any hard-coded survey links
                var regex = /(?:(?:https?):\/\/|www\.)(?:\([-A-Z0-9+&@#\/%=~_|$?!:,.]*\)|[-A-Z0-9+&@#\/%=~_|$?!:,.])*(?:\([-A-Z0-9+&@#\/%=~_|$?!:,.]*\)|[A-Z0-9+&@#\/%=~_|$])/igm,
                    matches, i=0, urls = new Array();
                while (matches = regex.exec(text)) {
                    // Check for survey URL (including Survey Base URL path, if applicable)
                    if ((starts_with(matches[0], app_path_survey_full) || starts_with(matches[0], app_path_webroot_full+'surveys/')) && matches[0].indexOf('__file=') === -1) {
                        if (!in_array(matches[0], urls)) {
                            urls[i++] = matches[0];
                        }
                    }
                }
                if (urls.length > 0) {
                    simpleDialog(window.lang.survey_1228+"<br><br>"+window.lang.survey_1229+"<ul><li>"+urls.join("</li><li>")+"</li></ul>",
                        window.lang.survey_1230, 'remove-hardcoded-links-warning', 650, null, window.lang.design_401);
                    return;
                }
                // If has survey link, then return
                if (!(text.indexOf('[survey-link]') < 0 && text.indexOf('[survey-url]') < 0 && text.indexOf('[survey-link:') < 0 && text.indexOf('[survey-url:') < 0)) return;
                // Get invitation type
                var suggestLink = (!select.length || select.val() == 'EMAIL' || select.val() == 'SMS_INVITE_WEB');
                if (!suggestLink) return;
                if (select.val() == 'SMS_INVITE_WEB') {
                    var textAppend = text + (text != '' ? ' -- ' : '') + 
						window.lang.survey_956 + ' [survey-url]';
                } else {
                    var textAppend = text + (text == '' 
						? '<p><?=RCView::tt("survey_1224", null) // Please take this survey. ?>' 
						: '') +
						'</p><p>' +
						'<?=RCView::tt("survey_134", null) // You may open the survey in your web browser by clicking the link below: ?>' +
						'<br/>[survey-link]</p><p>' +
						'<?=RCView::tt("survey_135", null) // If the link above does not work, try copying the link below into your web browser: ?>' + 
						'<br/>[survey-url]</p><p>' +
						'<?=RCView::tt("survey_137", null) // This link is unique to you and should not be forwarded to others. ?></p>';
                }
                // Dialog
                simpleDialog(window.lang.piping_48, window.lang.piping_74, 'checkComposeForSurveyLink', 600, null,
                    window.lang.piping_50,
                    function(){
                        $(ob).val(textAppend);
                        try {
                            tinyMCE.activeEditor.setContent(textAppend);
                        } catch(e) { }
                    }, window.lang.piping_51);
                $('#checkComposeForSurveyLink').parent().find('.ui-dialog-buttonpane button:eq(1)').css('font-weight','bold');
            }
        </script>
        <?php
    }

    // Get the default append_survey_link value that should be set in redcap_emails table
    // (this is mostly to deal with the fact that it could cause issues with not appending survey links inside emails during mid-upgrade)
    public static function getAppendSurveyLink($delivery_type='EMAIL')
    {
        // Always return 0 now, although in previous versions it tried to be smart about this but was not intuitive to users
        return '0';
        /**
        // If delivery_type is not EMAIL nor SMS_INVITE_WEB, then always append link
        if ($delivery_type != 'EMAIL' && $delivery_type != 'SMS_INVITE_WEB') return '1';
        // Set the min version at which append_survey_link should be "0"
        $versionsWithOne = '8.4.0';
        // If on this version or higher, return 0, else 1
        return (REDCap::versionCompare(REDCAP_VERSION, $versionsWithOne) >= 0 ? '0' : '1');
        */
    }

    // Return array of users who were contributors to a survey response
    public static function getResponseContributors($response_id, $returnOnlyAfterCompletion=false)
    {
        global $user_rights;
        $contributors = array();
        if (!isinteger($response_id)) return false;
        // Get the record, event, form, etc.
        $sql = "select s.project_id, s.form_name, p.event_id, r.record, r.instance, r.completion_time
				from redcap_surveys s, redcap_surveys_participants p, redcap_surveys_response r
				where s.survey_id = p.survey_id and p.participant_id = r.participant_id and r.response_id = $response_id limit 1";
        $q = db_query($sql);
        $attr = db_fetch_assoc($q);
        $Proj = new Project($attr['project_id']);
        // Users who have edited response SINCE COMPLETION
        $surveyFieldsLogging = array();
        foreach (array_keys($Proj->forms[$attr['form_name']]['fields']) as $this_field) {
            // Do not check for record ID field or calc fields
            if ($this_field == $Proj->table_pk || $Proj->metadata[$this_field]['element_type'] == 'calc') {
                continue;
            }
            $surveyFieldsLogging[] = $this_field;
        }
        // Ensure user can access this info (must have Data Entry Form level access)
        if (isset($user_rights['forms'][$attr['form_name']]) && $user_rights['forms'][$attr['form_name']] == '0') {
            return false;
        }
        // If we want to return only contributers AFTER the survey was completed
        $sqlComplete = "";
        if ($returnOnlyAfterCompletion) {
            if ($attr['completion_time'] == "") {
                // The survey has not been completed yet, so return no one
                return array();
            }
            $sqlComplete = " and ts > " . str_replace(array('-',' ',':'), array('','',''), $attr['completion_time']);
        }
        // Build query
        $sql2 = "and (data_values like '%\\n" . implode(" = \'%' or data_values like '%\\n", $surveyFieldsLogging) . " = \'%'
				or data_values like '" . implode(" = \'%' or data_values like '", $surveyFieldsLogging) . " = \'%')";
        $sql = "select distinct user from ".Logging::getLogEventTable($attr['project_id'])." where project_id = " . $attr['project_id'] . "
				and event in ('UPDATE','INSERT') and object_type = 'redcap_data'
				and pk = '" . db_escape($attr['record']) . "' and event_id = {$attr['event_id']} $sqlComplete" .
            //" and instance ".($attr['instance'] == '1' ? "is NULL" : "= ".$_GET['instance'])
            // Search only for fields on the CURRENT form (this *might* produce false positives if a
            // variable name matches insisde another variable's name in the data values log). For API imports,
            // we'll check the actualy fields listed in the log because API scripts can import multiple forms at once.
            " $sql2";
        $q = db_query($sql);
        while ($row = db_fetch_assoc($q))
        {
            $contributors[] = $row['user'];
        }
        sort($contributors);
        return $contributors;
    }

    // Enable/disable Google reCaptcha
    public static function enableCaptcha($enable=0)
    {
        $enable = (int)$enable;
        $sql = "update redcap_projects set google_recaptcha_enabled = $enable where project_id = ".PROJECT_ID;
        $q = db_query($sql);
        if ($q) {
            $descrip = ($enable ? "Enable" : "Disable") . " Google reCAPTCHA on public survey";
            Logging::logEvent($sql,"redcap_projects","manage",PROJECT_ID,"google_recaptcha_enabled = $enable", $descrip);
            return true;
        }
        return false;
    }
	
	// Display e-Consent PDF confirmation page, if applicable
	public static function renderEconsentPdfFrame()
	{
		global $hide_back_button;
		// Get survey URL for this participant	
		$private_link = REDCap::getSurveyLink($_GET['id'], $_GET['page'], $_GET['event_id'], $_GET['instance']);
		$return_code = Survey::getSurveyReturnCode($_GET['id'], $_GET['page'], $_GET['event_id'], $_GET['instance'], true);
		$pdfUrl = "$private_link&compact=1&display=inline&return_code=$return_code&instance={$_GET['instance']}&hideSurveyTimestamp=1&route=PdfController:index&__passthru=index.php";
		$mlm_context = Context::Builder()
			->is_survey()
			->project_id($_GET["pid"])
			->survey_hash($_GET["s"])
			->record($_GET["id"])
			->instrument($_GET["page"])
			->event_id($_GET["event_id"])
			->instance($_GET["instance"])
			->Build();
        $lang_id = MultiLanguage::getCurrentLanguage($mlm_context);
        $dag_id = Records::getRecordGroupId(PROJECT_ID, $_GET['id']);
		// Determine if the multilanguage feature is active
		$pdfUrl .= MultiLanguage::getPDFeConsentFlag($mlm_context);
		$header_translations = MultiLanguage::getPDFStaticStringTranslations($mlm_context);
		// Append anything to header/footer of PDF?
		list ($nameDobText, $versionText, $typeText) = Econsent::getEconsentOptionsData($_GET["pid"], $_GET['id'], $_GET['page'], $dag_id, $lang_id);
		$versionTypeTextArray = array();
		if ($nameDobText != '')	$versionTypeTextArray[] = $nameDobText;
		if ($versionText != '')	$versionTypeTextArray[] = ($header_translations["data_entry_428"] ?? RCView::getLangStringByKey("data_entry_428"))." ".$versionText;
		if ($typeText != '') 	$versionTypeTextArray[] = ($header_translations["data_entry_429"] ?? RCView::getLangStringByKey("data_entry_429"))." ".$typeText;
		$versionTypeText = implode(', ', $versionTypeTextArray);
		if ($versionTypeText != "") $pdfUrl .= "&appendToFooter=".urlencode($versionTypeText);
		// Javscript file
        loadJS('Econsent.js');
		// Determine if we're using signature fields that might need to be reset if participant clicks Previous Page button
        if (self::surveyHasEconsentSignatureValues(PROJECT_ID, $_GET['id'], $_GET['page'], $_GET['event_id'], $_GET['instance'])) {
			addLangToJS(array(
				"global_53",
				"survey_1266",
			));
            ?>
            <script type="text/javascript">
                $(function(){ resetSignatureValuesPrep(); });
            </script>
            <div id="resetSignatureValuesDialog" class="simpleDialog" data-rc-lang-attrs="title=survey_1264" title="<?=RCView::tt_js2("survey_1264")?>">
                <?=RCView::tt("survey_1265")?>
            </div>
            <?php
        }
		// Output iframe html
		$backBtnText = $hide_back_button ? "" : "<div id='econsent_confirm_instr2' style='margin:0 10px 15px;text-align:center;font-size:14px;'>".RCView::tt("survey_1170")."</div>";
        // Output HTML for eConsent certification page
		print  "<div style='margin:20px;font-size:14px;'>".RCView::tt("survey_1169")."</div>
				<div style='margin:5px;padding:3px;border:1px solid #ccc;'>
				    ".PDF::renderInlinePdfContainer($pdfUrl)."
				</div>
				<div id='econsent_confirm_checkbox_div' class='yellow' style='font-size:14px;margin:20px 20px 10px;'>
					<label id='econsent_confirm_checkbox_label' class='opacity50' style='text-indent:-22px;margin-left:40px;'>
						<input type='checkbox' id='econsent_confirm_checkbox'> ".RCView::tt("survey_1171")."</label>
				</div>
				$backBtnText";
	}

    // e-Consent Framework: Erase all signature field values before loading the survey page
    public static function eraseEconsentSignatures($project_id, $record, $form, $event_id, $instance=1)
    {
        // Make sure that the e-consent signature fields are set and have data and that the participant just clicked the Prev Page button while on the last page
        if (!(isset($_GET['__prevpage']) && isset($_GET['__es'])
            && self::surveyHasEconsentSignatureValues($project_id, $record, $form, $event_id, $instance))) {
            return false;
        }
        // Remove flag
        unset($_GET['__es']);
        // Erase the values
        return self::eraseEconsentSignatureValues($project_id, $record, $form, $event_id, $instance);
    }

    // Erase the participant's signature values and log this event
    public static function eraseEconsentSignatureValues($project_id, $record, $form, $event_id, $instance=1)
    {
        $Proj = new Project($project_id);
        // Get signature fields designated for this survey
        $sigFields = Econsent::getSignatureFieldsByForm($project_id, $record, $form, $event_id, $instance);
        if (empty($sigFields)) return false;
        // Set them as blank in POST array so that they don't get resubmitted on this save
        $fieldOrder = array();
        foreach ($sigFields as $field) {
            $_POST[$field] = '';
            $fieldOrder[$field] = $Proj->metadata[$field]['field_order'];
        }
        // Add flag to help us determine the page number downstream
        $min = min($fieldOrder);
        $_GET['__esf'] = array_search($min, $fieldOrder);
        // Return true since we got this far
        return true;
    }

    // Return boolean if a survey instrument has e-Consent signature fields designated that have values
    public static function surveyHasEconsentSignatureValues($project_id, $record, $form, $event_id, $instance=1)
    {
        // Get signature fields designated for this survey
        $sigFields = Econsent::getSignatureFieldsByForm($project_id, $record, $form, $event_id, $instance);
        if (empty($sigFields)) return false;
        // Get data
        $sql = "select count(1) from ".\Records::getDataTable($project_id)." where project_id = $project_id and record = ".checkNull($record)."
                and event_id = ".checkNull($event_id)." and field_name in (".prep_implode($sigFields).")
                and instance ".($instance == '1' ? "is null" : "= '$instance' and value != ''");
        $q = db_query($sql);
        return (db_result($q, 0) > 0);
    }

	// Return the Public Survey Link of a survey required for creating a project, moving to prod, moving to analysis mode, marking as completed
	public static function getProjectStatusPublicSurveyLink($config_key)
	{
	    $pid = $GLOBALS[$config_key];
	    if (!is_numeric($pid)) return '';
		$Proj = new Project($pid);
		$hash = self::getSurveyHash(null, null, null, $Proj);
		if ($hash == '') return '';

        // Using the Survey Base URL feature causes the survey not to load at
        // the main REDCap end-point due to cross-origin browser security issues. In this case, output the non-Survey Base URL.
        if ($GLOBALS['redcap_survey_base_url'] != '') {
            $survey_url = APP_PATH_WEBROOT_FULL."surveys/index.php?s=$hash";
        } else {
            $survey_url = APP_PATH_SURVEY_FULL."index.php?s=$hash";
        }

		return $survey_url;
	}

	// If someone just completed a custom project status transition survey, then save
	public static function savePidForCustomPublicSurveyStatusChange($surveyPidKey, $pidValue=null, $recordValue=null)
	{
		// If using survey_pid_create_project public survey, then store the PID of this new project in the "project_id" field of that project
		if (isinteger($pidValue) && isinteger($GLOBALS[$surveyPidKey]))
		{
		    // Instantiate the custom public survey project
			$Proj_survey_pid_create_project = new Project($GLOBALS[$surveyPidKey]);
			// Check if the public survey's project contains a PID field to save the value
			if (isset($Proj_survey_pid_create_project->metadata[self::$pidField])) {
				// Save value in project
				$data = array($pidValue=>array($Proj_survey_pid_create_project->firstEventId=>
                            array($Proj_survey_pid_create_project->table_pk=>$pidValue, self::$pidField=>$recordValue)
                        ));
				$response = Records::saveData($GLOBALS[$surveyPidKey], 'array', $data);
				// Return true if saved
				return empty($response['errors']);
			}
        }
		// Return false if did nothing
		return false;
    }

	// If this project's public survey is used as a custom project status transition survey, then output custom JS that will be executed inside an iframe
    public static $ProjectStatusPublicSurveyConfigKeys = array('survey_pid_create_project', 'survey_pid_move_to_prod_status', 'survey_pid_move_to_analysis_status', 'survey_pid_mark_completed');
	public static function outputCustomJavascriptProjectStatusPublicSurveyCompleted($current_project_id, $current_record=null)
	{
		if (!is_numeric($current_project_id)) return;
	    // Is this project's public survey registered in redcap_config?
		$config_key = '';
		foreach (self::$ProjectStatusPublicSurveyConfigKeys as $this_config_key) {
			if ($GLOBALS[$this_config_key] == $current_project_id) {
				$config_key = $this_config_key;
                break;
			}
        }
		if ($config_key == '') return;
		// Custom action based on config key
        $js = "";
        if ($config_key == 'survey_pid_create_project') {
            $js .= "window.parent.$('form[name=\"createdb\"]').append('<input type=\"hidden\" value=\"$current_record\" name=\"survey_pid_create_project\">');";
            $js .= 'window.parent.document.createdb.submit();';
        } elseif ($config_key == 'survey_pid_move_to_prod_status') {
			$js .= "window.parent.window.survey_pid_move_to_prod_status_record = '$current_record';";
            if ($GLOBALS['superusers_only_move_to_prod'] == '1') {
				$js .= "window.parent.window.doChangeStatus2();";
            } else {
				$randomizationStatus = ($GLOBALS['randomization'] && Randomization::setupStatus()) ? '1' : '0';
				$randProdAllocTableExists = ($randomizationStatus == '1' && Randomization::allocTableExists(1)) ? '1' : '0';
				$js .= "window.parent.window.doChangeStatus(0,'','',$randomizationStatus,$randProdAllocTableExists);";
            }
		} elseif ($config_key == 'survey_pid_move_to_analysis_status') {
			$js .= "window.parent.window.survey_pid_move_to_analysis_status_record = '$current_record';";
			$js .= "window.parent.window.btnMoveToProd();";
		} elseif ($config_key == 'survey_pid_mark_completed') {
			$js .= "window.parent.window.survey_pid_mark_completed_record = '$current_record';";
			$js .= "window.parent.window.markProjectAsCompleted();";
		}
        // Output JS and call exit()
        if ($js == '') return;
		exit(  "<script type='text/javascript'>
                if (inIframe()) { 
                    document.body.innerHTML = '';
                    $(function(){
                        showProgress(1); 
                        $js                        
                    })
                }
                </script>");
	}

    // Is a specified Project_ID set as a Custom Survey for Project Status Transition
    public static function isCustomSurveyProjectStatusTransition($pid) {
        if (!isinteger($pid)) return false;
        // Check if this is a Custom Survey for Project Status Transitions, and if so, remove the Survey Base URL value
        foreach (Survey::$ProjectStatusPublicSurveyConfigKeys as $this_config_key) {
            if (isset($GLOBALS[$this_config_key]) && $GLOBALS[$this_config_key] == $pid) {
                return true;
            }
        }
        // If we got this far, it ain't it
        return false;
    }

	// Retrieve survey_id using form_name
	public static function getSurveyId($form_name = null)
	{
		global $Proj;
		if (empty($form_name)) $form_name = $Proj->firstForm;
		return (isset($Proj->forms[$form_name]['survey_id']) ? $Proj->forms[$form_name]['survey_id'] : "");
	}

	// Creates unique results_code (that is, unique within that survey) and returns that value
	public static function getUniqueResultsCode($survey_id=null)
	{
		if (!is_numeric($survey_id)) return false;
		do {
			// Generate a new random hash
			$code = strtolower(generateRandomHash(8));
			// Ensure that the hash doesn't already exist in either redcap_surveys or redcap_surveys_hash (both tables keep a hash value)
			$sql = "select r.results_code from redcap_surveys_participants p, redcap_surveys_response r
					where p.participant_id = r.participant_id and p.survey_id = $survey_id and r.results_code = '$code' limit 1";
			$codeExists = (db_num_rows(db_query($sql)) > 0);
		} while ($codeExists);
		// Code is unique, so return it
		return $code;
	}

	// Determine if a survey hash is private and belongs to the provided record/event_id
	public static function isPrivateSurveyHash($hash, $record, $event_id)
	{
		if (!isinteger($event_id) || $record == "" || $hash == "") return false;
        $sql = "select * from redcap_surveys_participants p, redcap_surveys_response r
                where p.participant_id = r.participant_id and p.participant_email is not null
                and r.record = '".db_escape($record)."' and p.event_id = $event_id and p.hash = '".db_escape($hash)."' ";
        $q = db_query($sql);
        return (db_num_rows($q) > 0);
	}

	// 
	/**
	 * Exit the survey and give message to participant
	 * @param string $text 
	 * @param bool $largeFont 
	 * @param string|null $closeSurveyBtnText 
	 * @param bool $justCompletedSurvey 
	 * @param Context|null|'MLM-NO-CONTEXT' $mlm_context 
	 * @return never 
	 */
	public static function exitSurvey($text, $largeFont=true, $closeSurveyBtnText=null, $justCompletedSurvey=false, $mlm_context = null)
	{
		global $text_to_speech, $custom_css, $font_family, $text_size, $theme, $custom_theme_attr, $fetched, $Proj;

		// If paths have not been set yet, call functions that set them (need paths set for HtmlPage class)
		if (!defined('APP_PATH_WEBROOT'))
		{
			// Pull values from redcap_config table and set as global variables
			System::setConfigVals();
			// Set directory definitions
			System::defineAppConstants();
		}

		// If an incoming SMS or Twilio Voice Call
		if (Messaging::isIncomingRequest())
		{
			// An invalid choice was entered
			if (SMS) {
                (new Messaging(defined("PROJECT_ID") ? PROJECT_ID : $_GET['pid']))->send(strip_tags($text), $_POST['From']);
			} else {
				// Set voice and language attributes for all Say commands
				$language = TwilioRC::getLanguage();
				$voice = TwilioRC::getVoiceGender();
				$say_array = array('voice'=>$voice, 'language'=>$language);
				// Set header to output TWIML/XML
				header('Content-Type: text/xml');
				// Output Twilio TwiML object
				$twiml = new Services_Twilio_Twiml();
				$twiml->say(strip_tags($text), $say_array);
			}
			exit;
		}

		// Class for html page display system
		$objHtmlPage = new HtmlPage();
		$objHtmlPage->addExternalJS(APP_PATH_JS . "FontSize.js");
		$objHtmlPage->addExternalJS(APP_PATH_JS . "Survey.js");
		$objHtmlPage->addExternalJS(APP_PATH_JS . "DataEntrySurveyCommon.js");
		if (($text_to_speech == '1' && (!isset($_COOKIE['texttospeech']) || $_COOKIE['texttospeech'] == '1'))
			|| ($text_to_speech == '2' && isset($_COOKIE['texttospeech']) && $_COOKIE['texttospeech'] == '1')) {
			$objHtmlPage->addExternalJS(APP_PATH_JS . "TextToSpeech.js");
		}
		$objHtmlPage->addStylesheet("survey.css", 'screen,print');
		// Set the font family
		$objHtmlPage = Survey::applyFont($font_family, $objHtmlPage);
		// Set the size of survey text
		$objHtmlPage = Survey::setTextSize($text_size, $objHtmlPage);
		// If survey theme is being used, then apply it here
		$objHtmlPage = Survey::applyTheme($theme, $objHtmlPage, $custom_theme_attr);
		$objHtmlPage->PrintHeader();
		print "<div style='margin:10px;'>";
		if ($closeSurveyBtnText !== false) {
			$surveyBaseUrl = ($GLOBALS['redcap_survey_base_url'] == '' ? APP_PATH_SURVEY_FULL : $GLOBALS['redcap_survey_base_url']."surveys/");
			$closeSurveyBtnDiv = RCView::div(array('style'=>'padding:0 10px 10px; text-align:center;'),
				RCView::button(array('onclick'=>"
				            var pidurl = (typeof pid == 'undefined') ? '' : '&pid='+pid;
							try{ modifyURL('index.php?__closewindow=1'+pidurl); }catch(e){} 
							try{ window.open('', '_self', ''); }catch(e){} 
							try{ window.close(); }catch(e){} 
							try{ window.top.close(); }catch(e){} 
							try{ open(window.location, '_self').close(); }catch(e){} 
							try{ self.close(); }catch(e){} 
							let mlm_lang = '';
							try { mlm_lang = REDCap.MultiLanguage.getCurrentLanguage(); } catch(e) {}
							mlm_lang = mlm_lang ? '&".MultiLanguage::LANG_SURVEY_URL_OVERRIDE."=' + mlm_lang : '';
							window.location.href = '{$surveyBaseUrl}index.php?__closewindow=1'+pidurl+mlm_lang;
						", 'class'=>'jqbuttonmed'),
					($closeSurveyBtnText == null ? RCView::tt("dataqueries_278") : $closeSurveyBtnText)
				)
			);
		}
		// Display the text
		if ($largeFont) {
			print "<div style='margin:30px 0;font-size: 16px;'>$text</div>";
		} else {
			print "<div style='margin:30px 0;line-height: 1.5em;'>$text</div>";
		}
        // Display a "close" button at bottom of page
        if (!empty($closeSurveyBtnDiv)) print $closeSurveyBtnDiv;
		// Output custom survey css
		if ($custom_css != '') {
			print RCView::style("/* Custom Survey CSS */\n".strip_tags($custom_css));
		}
		// Only do the following if we just completed a survey
		if ($justCompletedSurvey) {
			// REDCap Hook injection point: Pass project/record/survey attributes to method
			$group_id = (empty($Proj->groups)) ? null : Records::getRecordGroupId(PROJECT_ID, $fetched);
			if (!is_numeric($group_id)) $group_id = null;
			$response_id = isset($_POST['__response_id__']) ? $_POST['__response_id__'] : '';
			if ($response_id == '' && isset($_GET['__rh'])) {
				$response_id = Survey::decryptResponseHash($_GET['__rh'], $GLOBALS['participant_id']);
			}
			if (!isset($_GET['__endpublicsurvey']) && defined("PROJECT_ID")) { // Don't call this hook again; it has already been called before redirecting with __endpublicsurvey in the URL
				Hooks::call('redcap_survey_complete', array(PROJECT_ID, (is_numeric($response_id) || $fetched != '' ? $fetched : null), $_GET['page'], $_GET['event_id'], $group_id, $_GET['s'], $response_id, $_GET['instance']));
				Survey::outputCustomJavascriptProjectStatusPublicSurveyCompleted(PROJECT_ID, (is_numeric($response_id) || $fetched != '' ? $fetched : null));
			}
			## Destroy the session on server and session cookie in user's browser
			$_SESSION = array();
			session_regenerate_id(true);
			session_unset();
			if (session_status() === PHP_SESSION_ACTIVE) session_destroy();
			unset($_COOKIE['survey']);
			deletecookie('survey');
			// To prevent refreshing the page and resubmitting data, redirect for force a GET request to end the survey
            if ($_SERVER['REQUEST_METHOD'] != 'GET' && $GLOBALS['public_survey'] && !isset($_GET['__endpublicsurvey'])) {
				$responseHash = Survey::encryptResponseHash($response_id, $GLOBALS['participant_id']);
				redirect($_SERVER['REQUEST_URI'] . "&__endpublicsurvey=1&__rh=$responseHash");
			}
			// REDCap Hook Injection point
            if (defined("PROJECT_ID")) {
				Hooks::call('redcap_survey_acknowledgement_page', array(PROJECT_ID, (is_numeric($response_id) || $fetched != '' ? $fetched : null), $_GET['page'], $_GET['event_id'], $group_id, $_GET['s'], $response_id, $_GET['instance']));
			}
		}
		print "</div>";
		// MLM
		if ($mlm_context != null) {
			if ($mlm_context === "MLM-NO-CONTEXT") $mlm_context = null;
			MultiLanguage::exitSurvey($mlm_context);
		}
		// Footer
		$objHtmlPage->PrintFooter();
		exit;
	}

	// Return participant_id when passed the hash
	public static function getParticipantIdFromHash($hash=null)
	{
		if ($hash == null) return false;
		$sql = "select participant_id from redcap_surveys_participants where hash = '" . db_escape($hash) . "' limit 1";
		$q = db_query($sql);
		// If participant_id exists, then return it
		return (db_num_rows($q) > 0) ? db_result($q, 0) : false;
	}

	// Make sure the survey belongs to this project
	public static function checkSurveyProject($survey_id)
	{
		global $Proj;
		return (is_numeric($survey_id) && isset($Proj->surveys[$survey_id]));
	}


	// Create array of field names designating their survey page with page number as key
	public static function getPageFields($form_name, $question_by_section)
	{
		global $Proj, $table_pk;
		// Set page counter at 1
		$page = 1;
		// Field counter
		$i = 1;
		// Create empty array
		$pageFields = array();
		// Loop through all form fields and designate fields to page based on location of section headers
		foreach (array_keys($Proj->forms[$form_name]['fields']) as $field_name)
		{
			// Do not include record identifier field nor form status field (since they are not shown on survey)
			if ($field_name == $table_pk || $field_name == $form_name."_complete") continue;
			// If field has a section header, then increment the page number (ONLY for surveys that have paging enabled)
			if ($question_by_section && $Proj->metadata[$field_name]['element_preceding_header'] != "" && $i != 1) $page++;
			// Add field to array
			$pageFields[$page][$i] = $field_name;
			// Increment field count
			$i++;
		}
		// If e-consent option is enabled, then auto-add one extra page to end of survey
		if (Econsent::econsentEnabledForSurvey($Proj->forms[$form_name]['survey_id'])) {
			$pageFields[$page+1] = array();
		}
		// Count total pages in the survey
		$totalPages = count($pageFields);
		// Return array
		return array($pageFields, $totalPages);
	}

	// Find the page number that a survey question is on based on variable name
	public static function getQuestionPage($variable,$pageFields)
	{
		$foundField = false;
		foreach ($pageFields as $this_page=>$these_fields) {
			foreach ($these_fields as $this_field) {
				if ($variable == $this_field) {
					// Found the page
					return $this_page;
				}
				if ($foundField) break;
			}
			if ($foundField) break;
		}
		// If not found, set to page 1
		return 1;
	}

	// Obtain a survey return code from a private link's hash. On fail, return "".
	public static function getReturnCodeFromHash($hash)
	{
		$return_code = '';
		$sql = "select p.survey_id, r.response_id, r.return_code 
				from redcap_surveys_participants p, redcap_surveys_response r
				where p.hash = '".db_escape($hash)."' and p.participant_id = r.participant_id 
				and p.participant_email is not null limit 1";
		$q = db_query($sql);
		if (db_num_rows($q) > 0) {
			// Get return code that already exists in table
			$return_code = db_result($q, 0, 'return_code');
			$response_id = db_result($q, 0, 'response_id');
			$survey_id = db_result($q, 0, 'survey_id');
			// If code is blank, then try to generate a return code
			if ($return_code == '') {
				$return_code = Survey::getUniqueReturnCode($survey_id, $response_id);
			}
		}
		return $return_code;
	}

	// Track the page number as a GET variable (not seen in query string).
	// Return the label for the Save button and array of fields to hide on this page.
	public static function setPageNum($pageFields, $totalPages, $bypassReturnCodeSection=false)
	{
		global $table_pk, $participant_id, $return_code, $save_and_return_code_bypass, $public_survey;
		// Manually obtain return code value if returning and bypassing return code
		if ($_SERVER['REQUEST_METHOD'] == 'GET' && $save_and_return_code_bypass == '1' && $return_code == "" && !$public_survey && self::getFirstSubmitTimeByHash($_GET['s']) != null) {
			$return_code = Survey::getReturnCodeFromHash($_GET['s']);
		}
		// e-Consent Framework: All signature field values are being erased, so take us to the page where the first signature field is located
		if ($_SERVER['REQUEST_METHOD'] != 'GET' && isset($_GET['__esf'])) {
			// Now find the page of this field
			$_GET['__page__'] = Survey::getQuestionPage($_GET['__esf'], $pageFields);
			unset($_GET['__esf']);
		}
		// FIRST PAGE OF SURVEY (i.e. request method = GET)
        elseif ($_SERVER['REQUEST_METHOD'] == 'GET' && $save_and_return_code_bypass != '1') {
			$_GET['__page__'] = 1;
		}
		// If returning and just entered return code, determine page based upon last field with data entered
        elseif (!$bypassReturnCodeSection && isset($return_code) && !empty($return_code)) {
			// Query data table for data and retrieve field with highest field order on this form
			// (exclude calc fields because may allow participant to pass up required fields that occur earlier)
			$sql = "select m.field_name from ".\Records::getDataTable(PROJECT_ID)." d, redcap_metadata m where m.project_id = " . PROJECT_ID . "
					and d.record = ". pre_query("select record from redcap_surveys_response where return_code = '" . db_escape($return_code) . "'
					and participant_id = $participant_id and completion_time is null limit 1") . "
					and m.project_id = d.project_id and m.field_name = d.field_name and d.event_id = {$_GET['event_id']}
					and d.instance ".($_GET['instance'] == '1' ? "is null" : "= ".$_GET['instance'])."
					and m.field_name != '$table_pk' and m.field_name != concat(m.form_name,'_complete') and m.form_name = '{$_GET['page']}'
					and m.element_type != 'calc' and !(m.element_type = 'text' and m.misc is not null and m.misc like '%@CALCTEXT%') 
					and d.value != '' and (m.misc is null or (m.misc not like '%@HIDDEN-SURVEY%' and trim(m.misc) not like '%@HIDDEN' and trim(m.misc) not like '%@HIDDEN %'))
					order by m.field_order desc limit 1";
			$lastFieldWithData = db_result(db_query($sql), 0);
			// Now find the page of this field
			$_GET['__page__'] = Survey::getQuestionPage($lastFieldWithData, $pageFields);
		}
		// Reduce page number if clicked previous page button
        elseif (isset($_POST['submit-action']) && isset($pageFields[$_POST['__page__']]) && is_numeric($_POST['__page__']))
		{
			if (isset($_GET['__reqmsg']) || isset($_GET['serverside_error_fields']) || isset($_GET['serverside_error_suf']) || isset($_GET['maxchoice_error_fields'])) {
				// If reloaded page for REQUIRED FIELDS or SERVER-SIDE VALIDATION, then set Get page as Post page (i.e. no increment)
				$_GET['__page__'] = $_POST['__page__'];
			} else {
				// PREV PAGE
				if (isset($_GET['__prevpage'])) {
					// Decrement $_POST['__page__'] value by 1
					$_GET['__page__'] = $_POST['__page__'] - 1;
				}
				// NEXT PAGE
				else {
					// Increment $_POST['__page__'] value by 1
					$_GET['__page__'] = $_POST['__page__'] + 1;
				}
			}
		}

		// Make sure page num is not in error
		if (!isset($_GET['__page__']) || $_GET['__page__'] < 1 || !is_numeric($_GET['__page__'])) {
			$_GET['__page__'] = 1;
		}

		// Set the label for the Submit button
		if ($totalPages > 1 && $totalPages != $_GET['__page__']) {
			$saveBtn = ($GLOBALS['survey_btn_text_next_page'] == '' ? RCView::tt("data_entry_536") : ("<span data-mlm=\"survey-survey_btn_text_next_page\">" . filter_tags(trim($GLOBALS['survey_btn_text_next_page'])) . "</span>"));
			$isLastPage = false;
		} else {
            $saveBtn = ($GLOBALS['survey_btn_text_submit'] == '' ? RCView::tt("survey_200") : ("<span data-mlm=\"survey-survey_btn_text_submit\">" . filter_tags(trim($GLOBALS['survey_btn_text_submit'])) . "</span>"));
			$isLastPage = true;
		}

		// Given the current page number, determine the fields on this form that should be hidden
		$hideFields = array();
		foreach ($pageFields as $this_page=>$these_fields) {
			if ($this_page != $_GET['__page__']) {
				foreach ($these_fields as $this_field) {
					$hideFields[] = $this_field;
				}
			}
		}

		// Return the label for the Save button and array of fields to hide on this page
		return array($saveBtn, $hideFields, $isLastPage);
	}

	// Gather record names and participant_ids of potential records (if an Initial Survey) and return as 2 arrays
	public static function getParticipantListSinglePage($survey_id, $event_id = null, $limit_begin=0, $num_per_page=50)
	{
		global $user_rights;
		// Set Proj object
		$Proj = new Project(PROJECT_ID);
		// Check event_id (if not provided, then use first one - i.e. for public surveys)
		if (!is_numeric($event_id)) $event_id = getEventId();

		// Get the first event_id of every Arm and place in array
		$firstEventIds = array();
		foreach ($Proj->events as $this_arm_num=>$arm_attr) {
			$arm_events_keys = array_keys($arm_attr['events']);
			$firstEventIds[] = print_r(array_shift($arm_events_keys), true);
		}

		// Is this a repeating event or form?
		$isRepeatingEvent = $Proj->isRepeatingEvent($event_id);
		$isRepeatingForm = $Proj->isRepeatingForm($event_id, $Proj->surveys[$survey_id]['form_name']);
		$isRepeatingFormOrEvent = ($isRepeatingForm || $isRepeatingEvent);

		// Get existing records for this survey
		$sorting = array();
		// Keep count of email addresses
		$emailAddressCount = $emailAddressCountThisPage = array();

		// Get emails for existing records, if user in DAGs, filter by user's group_id.
		$filterByGroupID = $user_rights['group_id'] != '' ? $user_rights['group_id'] : array();
		$allRecords = Records::getRecordList($Proj->project_id, $filterByGroupID, false, false, $Proj->eventInfo[$event_id]['arm_num']);
		$recordEmails = Survey::getResponsesEmailsIdentifiers($allRecords, $survey_id, $Proj->project_id, true);

		// If this is a repeating instrument/event, then gather all existing instances for existing records
		if ($isRepeatingFormOrEvent && !empty($allRecords)) {
			$instanceData = json_decode(Records::getData($Proj->project_id, 'json', $allRecords, array($Proj->table_pk, $Proj->surveys[$survey_id]['form_name']."_complete"), array($event_id)), true);
			unset($allRecords);
			foreach ($instanceData as $thisItem) {
				$this_record = $thisItem[$Proj->table_pk];
				$participant_email = isset($recordEmails[$this_record]['email']) ? $recordEmails[$this_record]['email'] : "";
				$sorting[] = $participant_email.'"'.$this_record.'"'.$thisItem['redcap_repeat_instance'].'"';
				// Increment the email address count
				if (isset($emailAddressCount[$participant_email])) {
					$emailAddressCount[$participant_email]++;
				} else {
					$emailAddressCount[$participant_email] = 1;
				}
			}
		} else {
			foreach ($allRecords as $this_record) {
				$participant_email = isset($recordEmails[$this_record]['email']) ? $recordEmails[$this_record]['email'] : "";
				$sorting[] = $participant_email.'"'.$this_record.'""';
				unset($allRecords[$this_record]);
				// Increment the email address count
				if (isset($emailAddressCount[$participant_email])) {
					$emailAddressCount[$participant_email]++;
				} else {
					$emailAddressCount[$participant_email] = 1;
				}
			}
			unset($allRecords);
		}
		unset($recordEmails);

		// Get participant_ids of potential records (if an Initial Survey)
		$initialSurvey = ($survey_id == $Proj->firstFormSurveyId && $Proj->isFirstEventIdInArm($event_id));
		if ($initialSurvey) {
			$this_instance = ($isRepeatingFormOrEvent) ? "1" : "";
			$sql = "select p.participant_id, p.participant_email
					from redcap_surveys_participants p left join redcap_surveys_response r on p.participant_id = r.participant_id 
					where p.participant_email is not null and p.event_id = $event_id and p.survey_id = $survey_id and r.record is null";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				$sorting[] = $row['participant_email'] . '""' . $this_instance . '"' . $row['participant_id'];
				// Increment the email address count
				if (isset($emailAddressCount[$row['participant_email']])) {
					$emailAddressCount[$row['participant_email']]++;
				} else {
					$emailAddressCount[$row['participant_email']] = 1;
				}
			}
		}

		// Sort the entire participant list
		$sorting = array_unique($sorting);
		natcasesort($sorting);

		// Get count
		$participant_count = count($sorting);

		// Now get only THIS page's participants
		$sorting = array_slice($sorting, $limit_begin, $num_per_page);

		// Now gather record names + participant_ids to only display on this page
		$records = $participant_ids = array();
		foreach ($sorting as $key=>$item) {
			list ($email, $record, $instance, $id) = explode('"', $item);
			if ($record != '') {
				$records[] = $record;
			} elseif ($id != '') {
				$participant_ids[] = $id;
			}
			unset($sorting[$key]);
			// Increment the email address count for THIS page
			if (isset($emailAddressCountThisPage[$email])) {
				$emailAddressCountThisPage[$email]++;
			} else {
				$emailAddressCountThisPage[$email] = 1;
			}
		}

		// For this page, find every email address's first occurrence number (because the numbering for duplicates is important with multiple pages)
		$emailAddressFirstNumThisPage = array();
		foreach ($emailAddressCountThisPage as $thisEmail=>$thisPageCount) {
			$thisPageFirstNum = $emailAddressCount[$thisEmail] - $thisPageCount - 1;
			if ($thisPageFirstNum <= 0) $thisPageFirstNum = 1;
			$emailAddressFirstNumThisPage[$thisEmail] = $thisPageFirstNum;
			unset($emailAddressCount[$thisEmail], $emailAddressCountThisPage[$thisEmail]);
		}

		// Add blank record to each array if they are empty in order to force queries/etc to return nothing
		if (empty($records)) $records[] = '';
		if (empty($participant_ids)) $participant_ids[] = '';

		// Return records and participant_ids as arrays
		return array($records, $participant_ids, $participant_count, $emailAddressFirstNumThisPage);
	}

	// Gather participant list (with identfiers and if Sent/Responded) and return as array
	public static function getParticipantList($survey_id, $event_id=null, $recordsAllowlist=array(), $participantIdsAllowlist=array())
	{
		global $user_rights;
		// Set Proj object
		$Proj = new Project(PROJECT_ID);

		// Check event_id (if not provided, then use first one - i.e. for public surveys)
		if (!is_numeric($event_id)) $event_id = getEventId();
		// Ensure the survey_id belongs to this project
		if (!Survey::checkSurveyProject($survey_id))
		{
			redirect(APP_PATH_WEBROOT . "index.php?pid=" . PROJECT_ID);
		}

		$table_pk = $Proj->table_pk;

		// Check if this is a follow-up survey
		$isFollowUpSurvey = !($survey_id == $Proj->firstFormSurveyId && $Proj->isFirstEventIdInArm($event_id));

		$isRepeatingFormOrEvent = $Proj->isRepeatingFormOrEvent($event_id, $Proj->surveys[$survey_id]['form_name']);

		// Check if time limit is enabled for survey
		$timeLimitEnabled = (Survey::calculateSurveyTimeLimit($Proj->surveys[$survey_id]['survey_time_limit_days'], $Proj->surveys[$survey_id]['survey_time_limit_hours'], $Proj->surveys[$survey_id]['survey_time_limit_minutes']) > 0);

		// For longitudinal projects with multiple arms, make sure that another arm's records are not displayed in this event's participant list
		$armSql = $armSql2 = $recordSql = $recordSql2 = "";
		$armRecords = array();
		if ($Proj->multiple_arms) {
			// Get list of records for the current arm (to which this event_id belongs)
			$armRecords = Records::getRecordList(PROJECT_ID, null, false, false, $Proj->eventInfo[$event_id]['arm_num']);
			if (!empty($recordsAllowlist)) {
				$armRecords = array_intersect($recordsAllowlist, $armRecords);
			}
			$armSql = " and d.record in (".prep_implode($armRecords).")";
			$armSql2 = " and record in (".prep_implode($armRecords).")";
			$countRecordsToDisplay = count($armRecords);
		} elseif (!empty($recordsAllowlist)) {
			$recordSql = " and d.record in (".prep_implode($recordsAllowlist).")";
			$recordSql2 = "and record in (".prep_implode($recordsAllowlist).")";
			$countRecordsToDisplay = count($recordsAllowlist);
		} else {
			$countRecordsToDisplay = Records::getRecordCount(PROJECT_ID);
		}

		// If this survey/event is not a repeating instrument or repeating event, then do quick check to see if the record count
        // in the response table for this survey/event matches the project's record count. If so, then skip the extra checks below regarding the response table.
        // We can only do this for a non-repeating survey/event because it is easy to count this way.
        $performResponseTableCheck = true;
		if (!$isRepeatingFormOrEvent) {
			$sql = "select count(*) from redcap_surveys_participants p, redcap_surveys_response d
                    where d.participant_id = p.participant_id and p.event_id = $event_id and p.survey_id = $survey_id 
                    and d.instance = 1 and p.participant_email is not null $armSql $recordSql";
			$q = db_query($sql);
			$responseTableCount = db_result($q, 0);
			$performResponseTableCheck = ($responseTableCount != $countRecordsToDisplay);
		}

		## Pre-populate the participants table and responses table with row for each record (if not already there)
        if ($performResponseTableCheck)
        {
			// First, get forms WITH data values on them
            $formStatusField = "{$Proj->surveys[$survey_id]['form_name']}_complete";
            $params = ['return_format'=>'json-array', 'records'=>(!empty($armRecords) ? $armRecords : $recordsAllowlist),
                        'fields'=>[$Proj->table_pk, $formStatusField], 'events'=>[$event_id], 'returnBlankForGrayFormStatus'=>true];
            $data = Records::getData($params);
            $recordFormWithData = [];
            foreach ($data as $attr) {
                if (($attr[$formStatusField] ?? "") != "") {
	                $recordFormWithData[] = $attr[$Proj->table_pk];
                }
            }
	        $recordSql3 = empty($recordFormWithData) ? "" : "and d.record in (".prep_implode($recordFormWithData).")";
            // For records with data on this form/survey, find those with no row in the surveys_response table
			$sql = "select distinct d.record, COALESCE(d.instance, 1) as instance
                    from ".\Records::getDataTable(PROJECT_ID)." d 
                    left join (
                        select r.record, p.event_id, r.instance, r.response_id
                        from redcap_surveys_participants p
                        inner join redcap_surveys_response r on r.participant_id = p.participant_id
                        where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_email is not null
                    ) pr on pr.event_id = d.event_id and pr.record = d.record and COALESCE(d.instance, 1) = pr.instance
                    where d.project_id = " . PROJECT_ID . " and d.event_id = $event_id 
                        and d.field_name = '{$Proj->surveys[$survey_id]['form_name']}_complete' 
                        and pr.response_id is null $recordSql3";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
                if (!$isRepeatingFormOrEvent && $row['instance'] != 1) continue; // Skip orphaned data
				Survey::getFollowupSurveyParticipantIdHash($survey_id, $row['record'], $event_id, false, $row['instance']);
			}

			// Second, get forms WITHOUT data values on them (this assumes that no repeating instances exist for them if the form has no data at all)
			$sql = "select distinct x.record 
                    from (
                        select project_id, record, '$event_id' as event_id 
                        from ".\Records::getDataTable(PROJECT_ID)." 
                        where project_id = " . PROJECT_ID . " 
                        and field_name in ('$table_pk', '{$Proj->surveys[$survey_id]['form_name']}_complete') 
                        $armSql2 $recordSql2
                    ) x
                    left join ".\Records::getDataTable(PROJECT_ID)." d on d.project_id = x.project_id and d.event_id = x.event_id and d.record = x.record
                        and field_name = '{$Proj->surveys[$survey_id]['form_name']}_complete'
                    left join (
                        select r.record, p.event_id
                        from redcap_surveys_participants p
                        inner join redcap_surveys_response r on r.participant_id = p.participant_id
                        where p.survey_id = $survey_id and p.participant_email is not null and r.response_id is null
                    ) pr on pr.event_id = x.event_id and pr.record = x.record
                    where d.record is null";
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				Survey::getFollowupSurveyParticipantIdHash($survey_id, $row['record'], $event_id, false, 1);
			}
		}

		// Build participant list
		$part_list = $participantIdsLimit = array();
		$addToParticipantIdsLimit = !empty($participantIdsAllowlist);
		if (empty($participantIdsAllowlist)) {
			$sql = "select p.* from redcap_surveys_participants p
					where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_email is not null";
		} else {
			$sql = "select p.* from redcap_surveys_participants p
					left join redcap_surveys_response r on r.participant_id = p.participant_id
					where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_email is not null";
			$sqlsub = array();
			if (!empty($participantIdsAllowlist) && $participantIdsAllowlist[0] != '') {
				$sqlsub[] = "p.participant_id in (" . prep_implode($participantIdsAllowlist) . ")";
			}
			if (!empty($recordsAllowlist) && $recordsAllowlist[0] != '') {
				$sqlsub[] = "r.record in (".prep_implode($recordsAllowlist).")";
			}
			if (!empty($sqlsub)) $sql .= " and (".implode(" or ", $sqlsub).")";
		}
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			// Set with email, identifier, and basic defaults for counts
			$part_list[$row['participant_id']] = array(
				'record'=>'', 'repeat_instance'=>1, 'email'=>$row['participant_email'],
				'identifier'=>$row['participant_identifier'],
				'phone'=>$row['participant_phone'], 'hash'=>$row['hash'], 'sent' =>0, 'response'=>0, 'return_code'=>'',
				'scheduled'=>'', 'next_invite_is_reminder'=>0,
				'delivery_preference'=>($row['delivery_preference'] == '' ? 'EMAIL' : $row['delivery_preference'])
			);
			if ($timeLimitEnabled) {
				$part_list[$row['participant_id']]['link_expiration'] = $row['link_expiration'];
			}
			if ($addToParticipantIdsLimit) {
				$participantIdsLimit[] = $row['participant_id'];
			}
		}

		// Query email invitations sent
		$sql = "select p.participant_id from redcap_surveys_emails e1, redcap_surveys_participants p, redcap_surveys_emails_recipients r
				left join redcap_surveys_scheduler_queue q on q.email_recip_id = r.email_recip_id
				where e1.survey_id = $survey_id and e1.email_id = r.email_id and p.survey_id = e1.survey_id
				and p.participant_id = r.participant_id and p.event_id = $event_id
				and ((q.ssq_id is not null and q.time_sent is not null) or (q.ssq_id is null and e1.email_sent is not null))";
		if (!empty($participantIdsLimit)) {
			$sql .= " and p.participant_id in (".prep_implode($participantIdsLimit).")";
		}
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			$part_list[$row['participant_id']]['sent'] = 1;
		}

		// Query for any responses AND return codes
		$saveAndReturnEnabled = ($Proj->surveys[$survey_id]['save_and_return']);
		$sql = "select p.participant_id, r.first_submit_time, r.completion_time, r.return_code, r.record, p.participant_email, r.instance
				from redcap_surveys_participants p, redcap_surveys_response r
				where p.survey_id = $survey_id and r.participant_id = p.participant_id and p.participant_email is not null
				and p.event_id = $event_id";
		if (!empty($participantIdsLimit)) {
			$sql .= " and p.participant_id in (".prep_implode($participantIdsLimit).")";
		}
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			$part_list[$row['participant_id']]['record'] = $row['record'];
			$part_list[$row['participant_id']]['repeat_instance'] = $row['instance'];
			if ($row['participant_email'] === null) {
				// Initial survey
				$part_list[$row['participant_id']]['response'] = ($row['completion_time'] == "" ? 1 : 2);
			} else {
				// Followup surveys (participant_email will be '' not null)
				if ($row['completion_time'] == "" && $row['first_submit_time'] == "") {
					$part_list[$row['participant_id']]['response'] = 0;
				} elseif ($row['completion_time'] == "" && $row['first_submit_time'] != "") {
					$part_list[$row['participant_id']]['response'] = 1;
				} else {
					$part_list[$row['participant_id']]['response'] = 2;
				}
			}
			// If save and return enabled, then include return code, if exists.
			if ($saveAndReturnEnabled) {
				$part_list[$row['participant_id']]['return_code'] = $row['return_code'];
			}
		}

		// If this is an INITIAL SURVEY, then it is possible that a double entry in the response table exists if the response
		// was create via a Public Survey, so the completions timestamps (and thus completion status) may belong to the public survey
		// response but NOT to the unique link response. In that case, get all public survey response status and overwrite any
		// that are missing as a unique link response status.
		if (!$isFollowUpSurvey) {
			$sql = "SELECT p.participant_id, if (rpub.completion_time is null, 1, 2) as response, rpub.instance
					FROM redcap_surveys_participants pub, redcap_surveys_response rpub, redcap_surveys_participants p, redcap_surveys_response r
					where pub.participant_email is null and pub.participant_id = rpub.participant_id and rpub.first_submit_time is not null
					and pub.survey_id = p.survey_id and pub.event_id = p.event_id and p.participant_id = r.participant_id
					and r.record = rpub.record and p.event_id = $event_id and p.survey_id = $survey_id";
			if (!empty($participantIdsLimit)) {
				$sql .= " and p.participant_id in (".prep_implode($participantIdsLimit).")";
			}
			$q = db_query($sql);
			while ($row = db_fetch_assoc($q)) {
				if (!isset($part_list[$row['participant_id']])) continue;
				// Add response status
				if ($part_list[$row['participant_id']]['response'] == 0) {
					$part_list[$row['participant_id']]['response'] = $row['response'];
					$part_list[$row['participant_id']]['repeat_instance'] = $row['instance'];
				}
			}
		}

		// SCHEDULED: Query for any responses that have been scheduled via the Invitation Scheduler
		// Store the reminder_num of the next invitation
		$next_reminder_num = array();
		// Order by send time desc because there might be several reminders, and we want to capture the NEXT one in the array (as well as its reminder_num)
		$sql = "select p.participant_id, q.scheduled_time_to_send, q.reminder_num from redcap_surveys_participants p,
				redcap_surveys_scheduler_queue q, redcap_surveys_emails_recipients r where p.survey_id = $survey_id
				and p.event_id = $event_id and p.participant_email is not null and q.email_recip_id = r.email_recip_id
				and p.participant_id = r.participant_id and q.status = 'QUEUED'";
		if (!empty($participantIdsLimit)) {
			$sql .= " and p.participant_id in (".prep_implode($participantIdsLimit).")";
		}
		$sql .= " order by q.scheduled_time_to_send desc";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			$part_list[$row['participant_id']]['scheduled'] = $row['scheduled_time_to_send'];
			$next_reminder_num[$row['participant_id']] = $row['reminder_num'];
		}
		// Loop through reminder_nums and add next_invite_is_reminder for each if > 0
		foreach ($next_reminder_num as $this_part=>$this_reminder_num) {
			if ($this_reminder_num > 0) {
				$part_list[$this_part]['next_invite_is_reminder'] = 1;
			}
		}

		## OBTAIN EMAIL ADDRESSES FOR FOLLOWUP SURVEYS (SINCE THEY DON'T HAVE THEM NATURALLY)
		// Follow-up surveys will not have an email in the participants table, so pull from initial survey's Participant List (if exists there)
		// Store record as key so we can retrieve this survey's participan_id for this record later
		$partRecords = array();
		foreach ($part_list as $this_part=>$attr)
		{
			// If record is blank, then remove from participant list and do not add to array
			// (How did a blank record get here, btw?)
			if ($isFollowUpSurvey && $attr['record'] == '') {
				unset($part_list[$this_part]);
				continue;
			}
			// Add to array
			$partRecords[] = $attr['record'];
		}
		// Get all participant attributes for this followup survey
		$participantAttributes = Survey::getResponsesEmailsIdentifiers($partRecords, $survey_id);

		foreach ($part_list as $this_part_id=>$attr) {
			// If found repeating instances when this form/event is not repeating, then remove them
			if (!$isRepeatingFormOrEvent && $attr['repeat_instance'] > 1) {
				unset($part_list[$this_part_id]);
				continue;
			}
			// Now use that record list to get the original email from first survey's participant list
			if (isset($participantAttributes[$attr['record']])) {
				$thisRecord = $participantAttributes[$attr['record']];
				// Add email and identifier
				$part_list[$this_part_id]['email'] = $thisRecord['email'];
				$part_list[$this_part_id]['identifier'] = $thisRecord['identifier'];
				$part_list[$this_part_id]['phone'] = $thisRecord['phone'];
				if ($part_list[$this_part_id]['delivery_preference'] == "" && $thisRecord['delivery_preference'] != "") {
					$part_list[$this_part_id]['delivery_preference'] = $thisRecord['delivery_preference'];
				}
			}
		}

		// Order array first by email address, record, instance, then by participant_id
		foreach ($part_list as $this_part_id=>$attr) {
			$attr['participant_id'] = $this_part_id;
			unset($part_list[$this_part_id]);
			$instance = isset($attr['repeat_instance']) ? $attr['repeat_instance'] : '';
			$part_list[$attr['email']."--".$attr['record']."--".$instance."--".$this_part_id] = $attr;
		}
		natcaseksort($part_list);
		foreach ($part_list as $this_email_part_id=>$attr) {
			$this_part_id = $attr['participant_id'];
			unset($part_list[$this_email_part_id], $attr['participant_id']);
			$part_list[$this_part_id] = $attr;
		}

		// DUPLICATE EMAIL ADDRESSES: Track when there are email duplicates so we can pre-pend with #) when displaying it multiple times in table
		$part_list_duplicates = array();
		foreach ($part_list as $this_part_id=>$attr) {
			if ($attr['email'] == '') continue;
			// Set to lowercase to group same emails together regardless of case
			$attr['email'] = strtolower($attr['email']);
			if (isset($part_list_duplicates[$attr['email']])) {
				$part_list_duplicates[$attr['email']]['total']++;
			} else {
				$part_list_duplicates[$attr['email']]['total'] = 1;
				$part_list_duplicates[$attr['email']]['current'] = 1;
			}
		}

		// If user is in a DAG, only allow them to see participants in their DAG
		if ($user_rights['group_id'] != '')
		{
			// Validate DAG that user is in
			$dags = $Proj->getGroups();
			if (isset($dags[$user_rights['group_id']])) {
				$dag_records = Records::getData('array', array(), $table_pk, array(), $user_rights['group_id']);
				// Loop through participants and remove any that have records NOT in user's DAG
				foreach ($part_list as $this_part_id=>$attr) {
					// If record not in user's DAG, remove participant from array
					if ($attr['record'] != '' && !isset($dag_records[$attr['record']])) {
						unset($part_list[$this_part_id]);
					}
				}
			}
		}

		// If survey time limit for completion setting is set, then obtain the link expiration times
		if ($timeLimitEnabled) {
			$initialInviteTimes = Survey::getLinkExpirationTimes(array_keys($part_list));
			foreach ($initialInviteTimes as $this_part_id=>$this_invite_time) {
				$part_list[$this_part_id]['link_expiration'] = $this_invite_time;
			}
		}

		// For longitudinal projects with multiple arms, make sure that another arm's records are not displayed in this event's participant list
		if ($Proj->multiple_arms && empty($participantIdsAllowlist)) {
			$noRecordsInArm = empty($armRecords);
			foreach ($part_list as $this_part_id=>$attr) {
				// Skip participants with no associated record
				if ($attr['record'] == '') continue;
				// Is record in this arm?
				if (!isset($armRecords[$attr['record']]) || $noRecordsInArm) {
					// Remove from participant list
					unset($part_list[$this_part_id]);
				}
			}
		}

		// Return array
		return array($part_list, $part_list_duplicates);
	}

	// Returns array of record names from an array of participant_ids (with participant_id as array key)
	// NOTE: For FOLLOWUP SURVEYS ONLY (assumes row exists in response table)
	public static function getRecordFromPartId($partIds=array())
	{
		$records = array();
		$sql = "select p.participant_id, r.record from redcap_surveys_participants p, redcap_surveys_response r
				where r.participant_id = p.participant_id and p.participant_id in (".prep_implode($partIds, false).")
				order by abs(r.record), r.record";
		$q = db_query($sql);
		while ($row = db_fetch_assoc($q))
		{
			$records[$row['participant_id']] = $row['record'];
		}
		return $records;
	}

	// SEND CONFIRMATION EMAIL TO RESPONDENT
	public static function sendSurveyConfirmationEmail($survey_id, $event_id, $record, $respondent_email_override=null, $instance=1)
	{
		global $Proj, $pdf_custom_header_text;

		// Get survey attributes
		$survey_attr = $Proj->surveys[$survey_id];
		$usingEconsentFramework = Econsent::econsentEnabledForSurvey($survey_id);
		// Set boolean flag to determine if email sends
		$emailSentSuccessfully = false;
		$attachmentCount = 0;

		// See if this is enabled
		if ($survey_attr['confirmation_email_subject'] != '' && $survey_attr['confirmation_email_content'] != '')
		{
			// Get respondent's email, if we have it
			if ($respondent_email_override == null) {
				$emailsIdents = Survey::getResponsesEmailsIdentifiers(array($record), $survey_id);
				$respondent_email = $emailsIdents[$record]['email'];
			} else {
				$respondent_email = $respondent_email_override;
			}
			if (!empty($respondent_email))
			{
				// Get Record / Event / Instrument
				$instrument = $survey_attr['form_name'];

				// Translate the email - in case multilanguage is set up, this will
				// substitute values in $survey_attr with the appropriate translations
				// $translate will indicate (true) whether translations were applied
				// (this will then be used to determine if PDF translations should be performed)
				$context = Context::Builder()
					->is_survey()
					->project_id($Proj->project_id)
					->survey_id($survey_id)
					->instrument($instrument)
					->record($record)
					->Build();
				$lang_id = MultiLanguage::translateSurveyAttributes($context, $survey_attr);
				if ($lang_id) {
					// Set for PDF
					$_GET[MultiLanguage::LANG_GET_NAME] = $lang_id;
					// Update context
					$context = Context::Builder($context)->lang_id($lang_id)->Build();
				}
				$version_prompt = MultiLanguage::getUITranslation($context, "data_entry_428"); // Version:
				$type_prompt = MultiLanguage::getUITranslation($context, "data_entry_429"); // Type:

				// Determine if we need to enforce protected email mode
				$enforceProtectedEmail = ($Proj->project['protected_email_mode'] && ($Proj->project['protected_email_mode_trigger'] == 'ALL'
                                        || ($Proj->project['protected_email_mode_trigger'] == 'PIPING' && containsIdentifierFields($survey_attr['confirmation_email_content'], $Proj->project_id))));

				// Perform piping on subject and message
				$this_subject = strip_tags(Piping::replaceVariablesInLabel($survey_attr['confirmation_email_subject'], $record, $event_id, $instance, [], true, null, true, ($Proj->isRepeatingForm($event_id, $survey_attr['form_name']) ? $survey_attr['form_name'] : ""), 1, false, false, $survey_attr['form_name']));
                $this_content = Piping::replaceVariablesInLabel($survey_attr['confirmation_email_content'],  $record, $event_id, $instance, [], true, null, true, ($Proj->isRepeatingForm($event_id, $survey_attr['form_name']) ? $survey_attr['form_name'] : ""), 1, false, false, $survey_attr['form_name']);
				// Determine if email message was created via rich text editor, and if so, remove all line breaks first
				if (substr($this_content, 0, 3) === '<p>' && substr($this_content, -4) === '</p>') {
					$this_content = str_replace(array("\r", "\n"), array("", ""), $this_content);
				}
				// Send email
				$email = new Message($Proj->project_id, $record, $event_id, $Proj->surveys[$survey_id]['form_name']);
				$email->setTo($respondent_email);
				$email->setFrom($survey_attr['confirmation_email_from']);
				$email->setFromName($survey_attr['confirmation_email_from_display']); // Add secondary and tertiary display name that matches an email in the project?
				$email->setSubject($this_subject);
				$email->setBody('<html><body style="font-family:arial,helvetica;">'.nl2br($this_content).'</body></html>');

				// Attach a PDF of the completed instrument
				if ($survey_attr['confirmation_email_attach_pdf'] == '1') {
                    $dag_id = Records::getRecordGroupId($Proj->project_id, $record);
					list ($nameDobText, $versionText, $typeText) = Econsent::getEconsentOptionsData($Proj->project_id, $record, $instrument, $dag_id, $lang_id);
					$versionTypeTextArray = array();
					if ($nameDobText != '')	$versionTypeTextArray[] = $nameDobText;
					if ($versionText != '')	$versionTypeTextArray[] = $version_prompt." ".$versionText;
					if ($typeText != '') 	$versionTypeTextArray[] = $type_prompt." ".$typeText;
					$versionTypeText = implode(', ', $versionTypeTextArray);

					$pdf = REDCap::getPDF($record, $instrument, $event_id, false, $_GET['instance'], $usingEconsentFramework, $pdf_custom_header_text, $versionTypeText,true,true);

					if ($usingEconsentFramework) {
						// For eConsent, use more consent-friendly PDF filename
						$pdf_filename_tmp = APP_PATH_TEMP . "ConsentForm_" . date('Y-m-d_His') . ".pdf";
						$pdf_filename_tmp = str_replace("__", "_", $pdf_filename_tmp);
					} else {
						$pdf_filename_tmp = APP_PATH_TEMP . date('YmdHis') . "_survey_" . substr(sha1(rand()), 0, 8) . '.pdf';
					}
					file_put_contents($pdf_filename_tmp, $pdf);
					$email->setAttachment($pdf_filename_tmp);
					$attachmentCount++;
				}
				if (is_numeric($survey_attr['confirmation_email_attachment'])) {
					## ATTACHMENT
					// Move file to temp directory using edoc_id
					$attachment_full_path = Files::copyEdocToTemp($survey_attr['confirmation_email_attachment']);
					// Add attachment
					$email->setAttachment($attachment_full_path);
					$attachmentCount++;
				}
				$emailSentSuccessfully = $email->send(false, true, $enforceProtectedEmail, 'SURVEY_CONFIRMATION', $lang_id);
				// Delete temp file, if applicable
				if (isset($attachment_full_path) && !empty($attachment_full_path)) {
					unlink($attachment_full_path);
				}
				if (isset($pdf_filename_tmp) && !empty($pdf_filename_tmp)) {
					unlink($pdf_filename_tmp);
				}
			}
		}

		// Log the sending of the confirmation email
        if ($emailSentSuccessfully) {
			$changes_made = "From: '".$survey_attr['confirmation_email_from']."',\nTo: ".RCView::getLangStringByKey("survey_499").",\nSubject: '$this_subject'";
			if ($attachmentCount > 0) {
				$changes_made .= ",\nAttachments: $attachmentCount";
				if ($survey_attr['confirmation_email_attach_pdf'] == '1') {
					if ($usingEconsentFramework && $survey_attr['confirmation_email_attach_pdf'] == '1') {
						$changes_made .= " (including PDF of survey responses: ".basename($pdf_filename_tmp).")";
					} else {
						$changes_made .= " (including PDF of survey responses)";
					}
				}
			}
			Logging::logEvent("", "redcap_surveys", "UPDATE", $record, $changes_made, "Send survey confirmation email to participant");
		}

		// Return if email was sent
		return $emailSentSuccessfully;
	}

	// Send emails to survey admins when a survey is completed, if enabled for any admin
	public static function sendEndSurveyEmails($survey_id, $event_id, $participant_id, $record, $instance=1)
	{
		global $Proj, $redcap_version, $lang, $project_contact_email;

		// Get survey attributes
		$survey_title = strip_tags($Proj->surveys[$survey_id]['title']);

		## SEND EMAILS TO SURVEY ADMINS
		// Check if any emails need to be sent and to whom
		$sql = "select distinct trim(if (a.action_response = 'EMAIL_TERTIARY', u.user_email3, 
					if (a.action_response = 'EMAIL_SECONDARY', u.user_email2, u.user_email))) as user_email, u.datetime_format
				from redcap_actions a, redcap_user_information u, redcap_user_rights r
				where a.project_id = " . PROJECT_ID . " and a.survey_id = $survey_id and a.project_id = r.project_id
				and r.username = u.username and a.action_trigger = 'ENDOFSURVEY' and u.user_suspended_time is null
				and a.action_response in ('EMAIL_PRIMARY', 'EMAIL_SECONDARY', 'EMAIL_TERTIARY') and u.ui_id = a.recipient_id";
		$q = db_query($sql);
		if (db_num_rows($q) > 0)
		{
			// Initialize email
			$email = new Message(PROJECT_ID, $record, $event_id, $Proj->surveys[$survey_id]['form_name'], $instance);
			$email->setSubject('[REDCap] '.RCView::getLangStringByKey("survey_21").' "'.$survey_title.'"');
			// Loop through all applicable admins and send email to each
			while ($row = db_fetch_assoc($q))
			{
				// Convert NOW into user's preferred datetime format
				$ts = DateTimeRC::format_user_datetime(NOW, 'Y-M-D_24', $row['datetime_format']);
				// Set email content
				$emailContents = "
					{$lang['survey_15']} {$lang['survey_16']} \"<b>$survey_title</b>\" {$lang['global_51']} {$ts}{$lang['period']}
					{$lang['survey_17']} <a href='".APP_PATH_WEBROOT_FULL."redcap_v{$redcap_version}/DataEntry/index.php?pid=".PROJECT_ID."&page={$_GET['page']}&event_id=$event_id&id=$record&instance=$instance'>{$lang['survey_18']}</a>{$lang['period']}<br><br>
					{$lang['survey_371']} <a href='".APP_PATH_WEBROOT_FULL."redcap_v{$redcap_version}/Design/online_designer.php?pid=".PROJECT_ID."'>{$lang['design_25']}</a>
					{$lang['survey_20']}";
				$email->setBody($emailContents,true);
				// Set to/from
				$email->setTo($row['user_email']);
				$email->setFrom(\Message::useDoNotReply($GLOBALS['project_contact_email']));
				$email->setFromName($GLOBALS['project_contact_name']);
				// Send it
				$email->send(false, null, false, 'SURVEY_NOTIFICATION');
			}
		}
	}

	// Encrypt the survey participant's response id as a hash
	public static function encryptResponseHash($response_id, $participant_id)
	{
		global $__SALT__;
		// Set algorithm
		$algo = 'sha512';
		// Perform the hash
		return hash($algo, $__SALT__ . $response_id) . hash($algo, $__SALT__ . $participant_id);
	}

	// Decrypt the survey participant's response hash as the response id
	public static function decryptResponseHash($hash, $participant_id)
	{
		global $__SALT__;
		// Set algorithm
		$algo = 'sha512';
		$algo_length = 128;
		// Make sure it's x chars long
		$algo_num = str_replace('sha', '', $algo);
		if (empty($hash) || (!empty($hash) && strlen($hash) != ($algo_length*2))) return '';
		// Break into two pieces
		$response_id_hash = substr($hash, 0, $algo_length);
		$participant_id_hash = substr($hash, $algo_length);
		// Verify participant_id value
		if ($participant_id_hash != hash($algo, $__SALT__ . $participant_id)) return '';
		// Now we must find the response_id by running a query to find it using one-way hashing
		$sql = "select response_id from redcap_surveys_response where participant_id = $participant_id
				and sha2(concat('$__SALT__',response_id),$algo_num) = '".db_escape($response_id_hash)."' limit 1";
		$q = db_query($sql);
		if ($q) {
			// Return the response_id
			return db_result($q, 0);
		}
		// Return false (as opposed to '') to denote legitimate reason for not finding it (due to complex technical reasons)
		return false;
	}

	// Obtain the response_hash value from the results code in the query string
	public static function getResponseHashFromResultsCode($results_code, $participant_id)
	{
		$sql = "select response_id from redcap_surveys_response where participant_id = $participant_id
				and results_code = '".db_escape($results_code)."' limit 1";
		$q = db_query($sql);
		if ($q && db_num_rows($q))
		{
			$response_id = db_result($q, 0);
			if (is_numeric($response_id)) {
				return Survey::encryptResponseHash($response_id, $participant_id);
			}
		}
		return '';
	}

	// Encrypt the page number __page__ on the form in order to later verify against the real value
	public static function getPageNumHash($page)
	{
		global $__SALT__;
		return md5($__SALT__ . $page . $__SALT__);
	}

	// Verify that the page number hash is correct for the page number sent via Post
	public static function verifyPageNumHash($hash, $page)
	{
		return ($hash == Survey::getPageNumHash($page));
	}

	// GET RESPONSE ID: If $_POST['__response_hash__'] exists and is not empty, then set $_POST['__response_id__']
	public static function initResponseId()
	{
		global $participant_id;
		// If somehow __response_id__ was posted on form (it should NOT), then remove it here
		unset($_POST['__response_id__']);
		// If response_hash exists, convert to response_id
		if (isset($_POST['__response_hash__']) && !empty($_POST['__response_hash__']))
		{
			$_POST['__response_id__'] = Survey::decryptResponseHash($_POST['__response_hash__'], $participant_id);
			// Somehow it failed to get response_id, then unset it
			if (empty($_POST['__response_id__'])) unset($_POST['__response_id__']);
		}
	}

    // CHECK POSTED PAGE NUMBER (verify if correct to prevent gaming the system)
	public static function initPageNumCheck()
	{
		if (isset($_POST['__page__']))
		{
			if (!isset($_POST['__page_hash__']) || (isset($_POST['__page_hash__']) && !Survey::verifyPageNumHash($_POST['__page_hash__'], $_POST['__page__'])))
			{
				// Could not verify page hash, so set to 0 (so gets set to page 1)
				$_POST['__page__'] = 0;
			}
		}
		// Remove page_hash from Post
		unset($_POST['__page_hash__']);
	}

    // For private survey links only, return the first submit time of a response. Return NULL if first submit time doesn't exist or is null.
    public static function getFirstSubmitTimeByHash($hash)
    {
        $sql = "select p.participant_id, r.response_id, r.first_submit_time, r.completion_time, 
                r.return_code, p.participant_identifier, p.participant_email, r.start_time
                from redcap_surveys_participants p, redcap_surveys_response r 
                where p.hash = ? and p.participant_id = r.participant_id and r.first_submit_time is not null
                order by p.participant_email desc limit 1";
        $q = db_query($sql, $hash);
        if (db_num_rows($q) > 0) {
            return db_result($q);
        }
        return null;
    }

    // Regarding the record-survey-event-instance, returns FALSE if response has not been started,
    // 0 if it is a partial response, or 1 if a completed response. If $returnTimestampIfCompleted=TRUE, then return the completion timestamp if completed.
	public static function isResponseCompleted($survey_id = null, $record = null, $event_id = null, $instance = 1, $returnTimestampIfCompleted=false)
	{
		// Check event_id/survey_id/record
		if (!is_numeric($event_id) || !is_numeric($survey_id) || !is_numeric($instance) || $record == '') return false;
		// Query response table
		$sql = "select r.completion_time from redcap_surveys_participants p, redcap_surveys_response r
			where r.participant_id = p.participant_id and p.survey_id = $survey_id
			and p.event_id = $event_id and r.record = '" . db_escape($record) . "' and r.instance = $instance
			and r.first_submit_time is not null
			order by r.completion_time desc, r.first_submit_time desc limit 1";
		$q = db_query($sql);
		if (db_num_rows($q) == 0) {
			return false;
		} elseif (db_result($q, 0) == '') {
			return 0;
		} else {
			return ($returnTimestampIfCompleted ? db_result($q, 0) : 1);
		}
	}

    // REMOVE QUEUED SURVEY INVITATIONS
    // If any participants have already been scheduled, then remove all those instances so they can be
    // scheduled again here (first part of query returns those where record=null - i.e. from initial survey
    // Participant List, and second part return those that are existing records).
	public static function removeQueuedSurveyInvitations($survey_id, $event_id, $email_ids=array())
	{
		$deleteErrors = 0;
		if (!empty($email_ids))
		{
			$ssq_ids_delete = array();
			$sql = "(select q.ssq_id from redcap_surveys_participants p, redcap_surveys_scheduler_queue q,
				redcap_surveys_emails_recipients e where p.survey_id = $survey_id and p.event_id = $event_id
				and p.participant_email is not null and q.email_recip_id = e.email_recip_id
				and p.participant_id = e.participant_id and q.status = 'QUEUED'
				and p.participant_id in (".prep_implode($email_ids, false)."))
				union
				(select q.ssq_id from redcap_surveys_participants p, redcap_surveys_response r,
				redcap_surveys_scheduler_queue q, redcap_surveys_emails_recipients e where p.survey_id = $survey_id
				and p.event_id = $event_id and r.participant_id = p.participant_id and p.participant_email is not null
				and q.email_recip_id = e.email_recip_id and p.participant_id = e.participant_id and r.record = q.record
				and q.status = 'QUEUED' and p.participant_id in (".prep_implode($email_ids, false)."))";
			$q = db_query($sql);
			if (db_num_rows($q) > 0)
			{
				// Gather all ssq_id's and email_recip_id's into arrays so we know what to delete
				while ($row = db_fetch_assoc($q)) {
					$ssq_ids_delete[] = $row['ssq_id'];
				}
				// Delete those already scheduled in redcap_surveys_emails_recipients (this will cascade to also delete in redcap_surveys_scheduler_queue)
				$sql = "update redcap_surveys_scheduler_queue set status = 'DELETED'
					where ssq_id in (".implode(",", $ssq_ids_delete).")";
				if (!db_query($sql)) $deleteErrors++;
			}
		}
		// Return false if errors occurred
		return ($deleteErrors > 0);
	}

	// Return boolean if a URL generally appears to be a survey link or survey queue link on this REDCap installation
    public static function isSurveyLink($url)
    {
        return (strpos($url, APP_PATH_SURVEY_FULL) === 0);
	}


	// We need to add __response_hash__ to the survey link
    public static function getResponseHashFromRecordEvent($surveyRecord, $surveyInstrument, $surveyEventId, $surveyInstance, $pid)
    {
		$Proj = new Project($pid);
		// Call getSurveyLink() merely to create a placeholder in the surveys_response table so that we can then query it later
		REDCap::getSurveyLink($surveyRecord, $surveyInstrument, $surveyEventId, $surveyInstance, $pid);
		// We need to add __response_hash__ to the survey link
		$sql = "select r.response_id, r.participant_id from
							redcap_surveys_participants p, redcap_surveys_response r 
							where r.participant_id = p.participant_id and r.record = '".db_escape($surveyRecord)."' and r.instance = '".db_escape($surveyInstance)."'
							and p.event_id = '".db_escape($surveyEventId)."' and p.survey_id = '".db_escape($Proj->forms[$surveyInstrument]['survey_id'])."'
							and p.participant_email is not null limit 1";
		$q = db_query($sql);
		$thisResponseId = db_result($q, 0, 'response_id');
		$thisParticipantId = db_result($q, 0, 'participant_id');
		return Survey::encryptResponseHash($thisResponseId, $thisParticipantId);
	}

	// Return boolean if we are currently on a public survey
	public static function isPublicSurvey()
	{
		return (isset($_GET['s']) && defined("NOAUTH") && defined("PAGE") && PAGE == 'surveys/index.php' && isset($GLOBALS['public_survey']) && $GLOBALS['public_survey']);
	}

	/**
	 * Creates HTML for the return code widget (Returning?) that is shown on (public) survey pages
	 * @return string
	 */
	public static function getReturnCodeWidget() {
		$href = APP_PATH_SURVEY_FULL."?s=".$_GET['s']."&__return=1";
		return "
			<div id=\"return_corner\" class=\"trigger\">
				<i class=\"fas fa-redo-alt\"></i>&nbsp;<a aria-label=\"".RCView::tt_js2("survey_1141")."\" href=\"{$href}\"><b>".RCView::tt("survey_22")."</b></a>
			</div>
			<table id=\"dpop\" class=\"popup\">
				<tr>
					<td class=\"left\"></td>
					<td>
						<table class=\"popup-contents\">
							<tr>
								<td class=\"return-corner-popup\">
									<span class=\"return-corner-popup-title\">
										<i class=\"fas fa-redo-alt\"></i>
										<b>".RCView::tt("survey_22")."</b> ".RCView::tt("survey_23")."
									</span>
									<br><br>
									".RCView::tt("survey_24")."
									<div class=\"return-corner-popup-button\">
										<button class=\"jqbuttonmed\" onclick=\"window.location.href='{$href}';\">".RCView::tt("survey_25")."</button>
									</div>
								</td>
							</tr>
						</table>
					</td>
					<td class=\"right\"></td>
				</tr>
			</table>";
	}

    public static function getSurveyPropertyById($project_id, $survey_id, $property_name='')
    {
        $project = new \Project($project_id);
        $surveys = $project->surveys;
        $survey = $surveys[$survey_id] ?? [];
        $property = ( array_key_exists($property_name, $survey) ) ? $survey[$property_name] : '';
        return $property;
    }

	/**
	 * Creates HTML for the Survey Queue link shown at the top of survey pages.
	 * @return string
	 */
	public static function getSurveyQueueLink() {
		$url = APP_PATH_SURVEY_FULL."?sq=".Survey::getRecordSurveyQueueHash($_GET['id']);
		return RCView::div(
			array(
				"id" => "survey_queue_corner",
			),
			RCView::a(
				array(
					"href" => "javascript:;",
					"onclick" => "$.get('{$url}', {}, function(data) {
						$('#overlay').height($(document).height()).width($(document).width()).show();
						$('#survey_queue_corner_dialog').html(data).show();
						if (isMobileDevice) {
							$('#survey_queue_corner_dialog').width($(window).width());
						}
						$('#survey_queue_corner_dialog').position({my:'center', at:'center', of:window});
						$('#survey_queue_corner_dialog .jqbuttonmed, #survey_queue_corner_dialog .jqbutton').button();
						if ($('#survey_queue_corner_dialog').height() > $(window).height()-100) {
							$('#survey_queue_corner_dialog').height($(window).height()-100);
							$('#survey_queue_corner_dialog').css('overflow-y', 'auto');
							$('#survey_queue_corner_dialog').width($('#survey_queue_corner_dialog').width()+getScrollBarWidth());
							$('#survey_queue_corner_dialog').position({ my: 'center', at: 'center', of: window });
						}
					});"
				),
				"<span class=\"fas fa-tasks\"></span> ".RCView::tt("survey_505")
			)
		);
	}

	// Return boolean if any active surveys' confirmation emails have an email body with identifier fields in it
	public static function anySurveyConfEmailsContainIdentifierFields($project_id)
	{
		$Proj = new Project($project_id);
		foreach ($Proj->surveys as $attr) {
			if ($attr['survey_enabled'] && $attr['confirmation_email_subject'] != '' && $attr['confirmation_email_content'] != ''
                && containsIdentifierFields($attr['confirmation_email_content'], $project_id)) {
				return true;
			}
		}
		return false;
	}

    // Obtain the highest-numbered repeating instance regarding the sending of a survey invitation
    // $type array: SENT, SCHEDULED, BOTH
    public static function getSurveyLastInstanceSent($project_id, $record, $form_name, $event_id, $type='SENT')
    {
        $Proj = new Project($project_id);
        if (!isset($Proj->forms[$form_name]['survey_id'])) return 0;
        $survey_id = $Proj->forms[$form_name]['survey_id'];
        if ($type == 'SENT') {
            $subsql = "and q.status = 'SENT'";
        } elseif ($type == 'SCHEDULED') {
            $subsql = "and q.status = 'QUEUED'";
        } else {
            $subsql = "and q.status in ('QUEUED', 'SENT')";
        }
        $sql = "select q.instance
				from redcap_surveys s, redcap_surveys_emails e, redcap_surveys_participants p, redcap_surveys_emails_recipients er
				left join redcap_surveys_scheduler_queue q on q.email_recip_id = er.email_recip_id
				where s.project_id = $project_id and s.survey_id = e.survey_id and e.email_id = er.email_id
                    and p.participant_id = er.participant_id
                    and (q.time_sent is not null or q.scheduled_time_to_send is not null or e.email_sent is not null)
                    and s.survey_id = $survey_id and p.event_id = $event_id and q.record = '".db_escape($record)."'
                    and q.reason_not_sent is null $subsql
				order by abs(q.instance) desc, q.instance desc limit 1";
        $q = db_query($sql);
        return db_num_rows($q) ? (db_result($q, 0) ?? 0) : 0;
    }

    // Obtain the highest-numbered repeating instance regarding the completion of a survey
    public static function getSurveyLastInstanceCompleted($project_id, $record, $form_name, $event_id)
    {
        $Proj = new Project($project_id);
        if (!isset($Proj->forms[$form_name]['survey_id'])) return 0;
        $survey_id = $Proj->forms[$form_name]['survey_id'];
        $sql = "select r.instance from redcap_surveys_participants p, redcap_surveys_response r 
				where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_id = r.participant_id
				and r.record = '" . db_escape($record) . "' and r.completion_time is not null
				order by abs(r.instance) desc, r.instance desc limit 1";
        $q = db_query($sql);
        return db_num_rows($q) ? (db_result($q, 0) ?? 0) : 0;
    }

	// Obtain the survey completion timestamp
	public static function getSurveyCompletionTime($project_id, $record, $form_name, $event_id, $instance=1)
	{
		$Proj = new Project($project_id);
		if (!isset($Proj->forms[$form_name]['survey_id'])) return "";
		if (!isinteger($instance) || !$Proj->isRepeatingFormOrEvent($event_id, $form_name)) $instance = 1;
		$survey_id = $Proj->forms[$form_name]['survey_id'];
		$sql = "select r.completion_time from redcap_surveys_participants p, redcap_surveys_response r 
				where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_id = r.participant_id
				and r.record = '" . db_escape($record) . "' and r.instance = $instance 
				order by r.completion_time desc limit 1";
		$q = db_query($sql);
		return db_num_rows($q) ? (db_result($q, 0) ?? "") : "";
	}

	// Obtain the survey start timestamp
	public static function getSurveyStartTime($project_id, $record, $form_name, $event_id, $instance=1)
	{
		$Proj = new Project($project_id);
		if (!isset($Proj->forms[$form_name]['survey_id'])) return "";
		if (!isinteger($instance) || !$Proj->isRepeatingFormOrEvent($event_id, $form_name)) $instance = 1;
		$survey_id = $Proj->forms[$form_name]['survey_id'];
		$sql = "select r.start_time from redcap_surveys_participants p, redcap_surveys_response r 
				where p.survey_id = $survey_id and p.event_id = $event_id and p.participant_id = r.participant_id
				and r.record = '" . db_escape($record) . "' and r.instance = $instance and r.start_time is not null
				order by r.start_time limit 1";
		$q = db_query($sql);
		return db_num_rows($q) ? (db_result($q, 0) ?? "") : "";
	}

    // Erase the survey start timestamp for a record/event/instance or record/event/form/instance (if a user deletes all the data for a form or event)
    public static function eraseSurveyStartTime($project_id, $record, $form_name, $event_id, $instance=1)
    {
        $Proj = new Project($project_id);
        if (!isinteger($instance) || ($form_name != null && !$Proj->isRepeatingFormOrEvent($event_id, $form_name))
            || ($form_name == null && !$Proj->isRepeatingEvent($event_id))
        ) {
            $instance = 1;
        }
        $sqls = "";
        if ($form_name != null) {
            if (!isset($Proj->forms[$form_name]['survey_id'])) return "";
            $survey_id = $Proj->forms[$form_name]['survey_id'];
            $sqls = "and p.survey_id = $survey_id";
        }
        $sql = "update redcap_surveys_participants p, redcap_surveys_response r 
                set r.start_time = null
				where p.event_id = $event_id and p.participant_id = r.participant_id $sqls
				and r.record = '" . db_escape($record) . "' and r.instance = $instance and r.start_time is not null";
        return db_query($sql);
    }

    // Redirect to a new instance if the current repeating instance of a survey already contains data
    public static function redirectIfCurrentInstanceHasData($project_id, $record, $form_name, $event_id, $instance, $redirectToForm=false)
    {
        $Proj = new Project($project_id);
        // If not a valid survey or repeating instance, return false
        if ((!$redirectToForm && !isset($Proj->forms[$form_name]['survey_id'])) || !isinteger($instance) || !$Proj->isRepeatingFormOrEvent($event_id, $form_name)) {
            return false;
        }
		// Sanitize instance
		$instance = intval($instance);
		if ($instance < 1) $instance = 1;
	    // Get count of existing instances and find next instance number
	    list ($instanceTotal, $instanceMax) = RepeatInstance::getRepeatFormInstanceMaxCount($record, $event_id, $form_name, $Proj);
	    $instanceNext = max(array($instanceMax, $instance)) + 1;
        // Does the current instance have [survey] data (i.e., some data was entered via survey)?
		$datatable = \Records::getDataTable($project_id);
		$instance_clause = $instance > 1 ? "instance = $instance" : "instance is null";
		$sql = "SELECT 1 FROM $datatable WHERE project_id = ? AND event_id = ? AND record = ? AND field_name = ? AND $instance_clause";
		$q = db_query($sql, [$project_id, $event_id, $record, "$form_name"."_complete"]);
        $instrumentHasData = (db_num_rows($q) > 0);
        if (!$instrumentHasData && $instance > $instanceMax) {
            return false;
        }
        // Check if survey data exists (i.e., entered via survey, not just via form). If so, return false.
        if (!$redirectToForm) {
            $hash = REDCap::getSurveyLink($record, $form_name, $event_id, $instance, $project_id, true, true);
            $sql = "select r.first_submit_time from redcap_surveys_participants p, redcap_surveys_response r 
                where p.hash = '" . db_escape($hash) . "' and p.participant_id = r.participant_id
                order by r.first_submit_time desc limit 1";
            $q = db_query($sql);
            $dataEnteredViaSurvey = (db_num_rows($q) > 0 && db_result($q, 0) != '');
            if (!$dataEnteredViaSurvey) {
                return false;
            }
        }
        // Get form or survey URL
        if ($redirectToForm) {
            // Get the next instance's form URL
            $repeatLink = APP_PATH_WEBROOT_FULL."redcap_v".REDCAP_VERSION."/DataEntry/index.php?pid={$Proj->project_id}&page={$form_name}&id={$record}&event_id={$event_id}&instance={$instanceNext}";
        } else {
            // Get the next instance's survey URL
            $repeatLink = REDCap::getSurveyLink($record, $form_name, $event_id, $instanceNext);
			if ($repeatLink == null) return false;
			// Add any other extra parameters original in the survey URL, if applicable (for field pre-filling)
			$parsed = parse_url($_SERVER['REQUEST_URI']);
			$query = $parsed['query'];
			parse_str($query, $params);
			unset($params['s'], $params['new']);
			if (!empty($params)) $repeatLink .= "&" . http_build_query($params);
        }
        // Finally, redirect to survey URL
        redirect($repeatLink."&new");
    }


    // Ask respondent to enter survey access code (either voice call or SMS)
    public static function promptSurveyCode($voiceCall, $respondentPhoneNumber, $project_id)
    {
        global $lang;
        // If missing the respondent's phone number, then return error
        if ($respondentPhoneNumber == null || (!$voiceCall && !isinteger($project_id))) {
            exit("ERROR!");
        }

        if ($voiceCall) {
            ## VOICE CALL
            // Instantiate Twilio TwiML object
            $twiml = new Services_Twilio_Twiml();
            // Set question properties
            $gather = $twiml->gather(array('method'=>'POST', 'action'=>APP_PATH_SURVEY_FULL, 'finishOnKey'=>TwilioRC::VOICE_SKIP_DIGIT));
            // Say the field label
            $gather->say($lang['survey_619']." ".$lang['survey_1592']);
            // Output twiml
            print $twiml;
        } else {
            ## SMS
            $messaging = new Messaging($project_id);
            $smsSuccess = $messaging->send($lang['survey_619']." ".$lang['survey_1592'], $respondentPhoneNumber);
            if ($smsSuccess !== true) {
                // Error sending SMS
            }
        }
        exit;
    }

    // Redirect to another survey page (and redirect the POST params in a POST request, if possible)
    public static function redirectSmsVoiceSurvey($hash=null, $pid=null)
    {
        // Set survey URL
        $url = APP_PATH_SURVEY."index.php?".($hash == null ? "" : "&s=$hash").($pid == null ? "" : "&pid=$pid");
        // Redirect to survey page
        if (Messaging::getIncomingRequestType() == Messaging::PROVIDER_TWILIO) {
            $url = APP_PATH_SURVEY."index.php?s=$hash"; // Twilio doesn't need PID
            // Twilio only: Use Twilio-specific redirection TwiML
            exit('<?xml version="1.0" encoding="UTF-8"?><Response><Redirect method="POST">'.$url.'</Redirect></Response>');
        } elseif (Messaging::isIncomingRequest()) {
            // Non-Twilio incoming SMS request (e.g., Mosio)
            // Add session_id param to POST
            $_POST[System::POST_REDIRECT_SESSION_ID] = Session::sessionId();
            // Use special GET=>POST redirect since it's not possible to simply redirect to a POST request
            System::redirectAsPost($url, $_POST);
        } else {
            // Standard GET redirect
            redirect($url);
        }
    }


	/**
	 * Checks whether any field on the survey's form is set as a stop action
	 * @param string|int $survey_id 
	 * @param string|int|null $project_id 
	 * @return bool 
	 */
	public static function hasStopActions($survey_id, $project_id = null) {
		$Proj = new Project($project_id);
		if (!array_key_exists($survey_id, $Proj->surveys)) return false;
		$form = $Proj->surveys[$survey_id]['form_name'];
		foreach ($Proj->getFormFields($form) as $field) {
			$field_metadata = $Proj->metadata[$field];
			if ($field_metadata['stop_actions'] !== null) return true;
		}
		return false;
	}


    // Estimate (not perfect) if the project is utilizing email addresses entered into an initial survey in the Participant List.
    // Base this on the first X number of rows in the participants table for the first survey and first event(s).
	public static $isUsingInitialSurveyEmailsInPartList = null;
    public static function usingInitialSurveyEmailsInPartList($project_id)
    {
        // Use cache, if available
        if (self::$isUsingInitialSurveyEmailsInPartList !== null) {
            return self::$isUsingInitialSurveyEmailsInPartList;
		}

        // Set default
		self::$isUsingInitialSurveyEmailsInPartList = false;
		$Proj = new Project($project_id);

        // If the first form is not a survey OR if using Twilio/Mosio for surveys specifically, then return false
		if ($Proj->firstFormSurveyId === null || $Proj->twilio_enabled_surveys) {
			return self::$isUsingInitialSurveyEmailsInPartList;
		}

        // Get all first event_ids for all arms so there we're checking across all arms
        $firstEventIds = [];
        foreach ($Proj->events as $arm_attr) {
            $firstEventIds[] = $Proj->getFirstEventIdArmId($arm_attr['id']);
        }

        // Query the participants table (choose the first applicable rows to check against) - Check a sampling of the first 500 applicable rows.
        $sql = "select 1 from (
                    select participant_email
                    from redcap_surveys_participants 
                    where survey_id = {$Proj->firstFormSurveyId} 
                    and event_id in (" . implode(",", $firstEventIds) . ")
                    and participant_email is not null
                    order by participant_id 
                    limit 500
                ) x
                where x.participant_email != '' 
                limit 1";
        $q = db_query($sql);
        // Set as true if any rows are returned
        self::$isUsingInitialSurveyEmailsInPartList = (db_num_rows($q) > 0);

        // Return the value
		return self::$isUsingInitialSurveyEmailsInPartList;
	}
}