chamilo-lms2/main/exercise/exercise.class.php

<?php
/* For licensing terms, see /license.txt */

use Chamilo\CoreBundle\Entity\GradebookLink;
use Chamilo\CoreBundle\Entity\TrackEHotspot;
use ChamiloSession as Session;
use Doctrine\DBAL\Types\Type;

/**
 * Class Exercise.
 *
 * Allows to instantiate an object of type Exercise
 *
 * @package chamilo.exercise
 *
 * @todo use getters and setters correctly
 *
 * @author Olivier Brouckaert
 * @author Julio Montoya Cleaning exercises
 * Modified by Hubert Borderiou #294
 */
class Exercise
{
    public $iId;
    public $id;
    public $name;
    public $title;
    public $exercise;
    public $description;
    public $sound;
    public $type; //ALL_ON_ONE_PAGE or ONE_PER_PAGE
    public $random;
    public $random_answers;
    public $active;
    public $timeLimit;
    public $attempts;
    public $feedback_type;
    public $end_time;
    public $start_time;
    public $questionList; // array with the list of this exercise's questions
    /* including question list of the media */
    public $questionListUncompressed;
    public $results_disabled;
    public $expired_time;
    public $course;
    public $course_id;
    public $propagate_neg;
    public $saveCorrectAnswers;
    public $review_answers;
    public $randomByCat;
    public $text_when_finished;
    public $display_category_name;
    public $pass_percentage;
    public $edit_exercise_in_lp = false;
    public $is_gradebook_locked = false;
    public $exercise_was_added_in_lp = false;
    public $lpList = [];
    public $force_edit_exercise_in_lp = false;
    public $categories;
    public $categories_grouping = true;
    public $endButton = 0;
    public $categoryWithQuestionList;
    public $mediaList;
    public $loadQuestionAJAX = false;
    // Notification send to the teacher.
    public $emailNotificationTemplate = null;
    // Notification send to the student.
    public $emailNotificationTemplateToUser = null;
    public $countQuestions = 0;
    public $fastEdition = false;
    public $modelType = 1;
    public $questionSelectionType = EX_Q_SELECTION_ORDERED;
    public $hideQuestionTitle = 0;
    public $scoreTypeModel = 0;
    public $categoryMinusOne = true; // Shows the category -1: See BT#6540
    public $globalCategoryId = null;
    public $onSuccessMessage = null;
    public $onFailedMessage = null;
    public $emailAlert;
    public $notifyUserByEmail = '';
    public $sessionId = 0;
    public $questionFeedbackEnabled = false;
    public $questionTypeWithFeedback;
    public $showPreviousButton;
    public $notifications;
    public $export = false;
    public $autolaunch;
    public $exerciseCategoryId;
    public $pageResultConfiguration;

    /**
     * Constructor of the class.
     *
     * @param int $courseId
     *
     * @author Olivier Brouckaert
     */
    public function __construct($courseId = 0)
    {
        $this->iId = 0;
        $this->id = 0;
        $this->exercise = '';
        $this->description = '';
        $this->sound = '';
        $this->type = ALL_ON_ONE_PAGE;
        $this->random = 0;
        $this->random_answers = 0;
        $this->active = 1;
        $this->questionList = [];
        $this->timeLimit = 0;
        $this->end_time = '';
        $this->start_time = '';
        $this->results_disabled = 1;
        $this->expired_time = 0;
        $this->propagate_neg = 0;
        $this->saveCorrectAnswers = 0;
        $this->review_answers = false;
        $this->randomByCat = 0;
        $this->text_when_finished = '';
        $this->display_category_name = 0;
        $this->pass_percentage = 0;
        $this->modelType = 1;
        $this->questionSelectionType = EX_Q_SELECTION_ORDERED;
        $this->endButton = 0;
        $this->scoreTypeModel = 0;
        $this->globalCategoryId = null;
        $this->notifications = [];
        $this->exerciseCategoryId = 0;
        $this->pageResultConfiguration;

        if (!empty($courseId)) {
            $courseInfo = api_get_course_info_by_id($courseId);
        } else {
            $courseInfo = api_get_course_info();
        }
        $this->course_id = $courseInfo['real_id'];
        $this->course = $courseInfo;
        $this->sessionId = api_get_session_id();

        // ALTER TABLE c_quiz_question ADD COLUMN feedback text;
        $this->questionFeedbackEnabled = api_get_configuration_value('allow_quiz_question_feedback');
        $this->showPreviousButton = true;
    }

    /**
     * Reads exercise information from the data base.
     *
     * @author Olivier Brouckaert
     *
     * @param int  $id                - exercise Id
     * @param bool $parseQuestionList
     *
     * @return bool - true if exercise exists, otherwise false
     */
    public function read($id, $parseQuestionList = true)
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $tableLpItem = Database::get_course_table(TABLE_LP_ITEM);

        $id = (int) $id;
        if (empty($this->course_id)) {
            return false;
        }

        $sql = "SELECT * FROM $table 
                WHERE c_id = ".$this->course_id." AND id = ".$id;
        $result = Database::query($sql);

        // if the exercise has been found
        if ($object = Database::fetch_object($result)) {
            $this->iId = $object->iid;
            $this->id = $id;
            $this->exercise = $object->title;
            $this->name = $object->title;
            $this->title = $object->title;
            $this->description = $object->description;
            $this->sound = $object->sound;
            $this->type = $object->type;
            if (empty($this->type)) {
                $this->type = ONE_PER_PAGE;
            }
            $this->random = $object->random;
            $this->random_answers = $object->random_answers;
            $this->active = $object->active;
            $this->results_disabled = $object->results_disabled;
            $this->attempts = $object->max_attempt;
            $this->feedback_type = $object->feedback_type;
            $this->sessionId = $object->session_id;
            $this->propagate_neg = $object->propagate_neg;
            $this->saveCorrectAnswers = $object->save_correct_answers;
            $this->randomByCat = $object->random_by_category;
            $this->text_when_finished = $object->text_when_finished;
            $this->display_category_name = $object->display_category_name;
            $this->pass_percentage = $object->pass_percentage;
            $this->is_gradebook_locked = api_resource_is_locked_by_gradebook($id, LINK_EXERCISE);
            $this->review_answers = (isset($object->review_answers) && $object->review_answers == 1) ? true : false;
            $this->globalCategoryId = isset($object->global_category_id) ? $object->global_category_id : null;
            $this->questionSelectionType = isset($object->question_selection_type) ? $object->question_selection_type : null;
            $this->hideQuestionTitle = isset($object->hide_question_title) ? (int) $object->hide_question_title : 0;
            $this->autolaunch = isset($object->autolaunch) ? (int) $object->autolaunch : 0;
            $this->exerciseCategoryId = isset($object->exercise_category_id) ? (int) $object->exercise_category_id : 0;

            $this->notifications = [];
            if (!empty($object->notifications)) {
                $this->notifications = explode(',', $object->notifications);
            }

            if (!empty($object->page_result_configuration)) {
                $this->pageResultConfiguration = $object->page_result_configuration;
            }

            if (isset($object->show_previous_button)) {
                $this->showPreviousButton = $object->show_previous_button == 1 ? true : false;
            }

            $sql = "SELECT lp_id, max_score
                    FROM $tableLpItem
                    WHERE   
                        c_id = {$this->course_id} AND
                        item_type = '".TOOL_QUIZ."' AND
                        path = '".$id."'";
            $result = Database::query($sql);

            if (Database::num_rows($result) > 0) {
                $this->exercise_was_added_in_lp = true;
                $this->lpList = Database::store_result($result, 'ASSOC');
            }

            $this->force_edit_exercise_in_lp = api_get_configuration_value('force_edit_exercise_in_lp');
            $this->edit_exercise_in_lp = true;
            if ($this->exercise_was_added_in_lp) {
                $this->edit_exercise_in_lp = $this->force_edit_exercise_in_lp == true;
            }

            if (!empty($object->end_time)) {
                $this->end_time = $object->end_time;
            }
            if (!empty($object->start_time)) {
                $this->start_time = $object->start_time;
            }

            // Control time
            $this->expired_time = $object->expired_time;

            // Checking if question_order is correctly set
            if ($parseQuestionList) {
                $this->setQuestionList(true);
            }

            //overload questions list with recorded questions list
            //load questions only for exercises of type 'one question per page'
            //this is needed only is there is no questions

            // @todo not sure were in the code this is used somebody mess with the exercise tool
            // @todo don't know who add that config and why $_configuration['live_exercise_tracking']
            /*global $_configuration, $questionList;
            if ($this->type == ONE_PER_PAGE && $_SERVER['REQUEST_METHOD'] != 'POST'
                && defined('QUESTION_LIST_ALREADY_LOGGED') &&
                isset($_configuration['live_exercise_tracking']) && $_configuration['live_exercise_tracking']
            ) {
                $this->questionList = $questionList;
            }*/
            return true;
        }

        return false;
    }

    /**
     * @return string
     */
    public function getCutTitle()
    {
        $title = $this->getUnformattedTitle();

        return cut($title, EXERCISE_MAX_NAME_SIZE);
    }

    /**
     * returns the exercise ID.
     *
     * @author Olivier Brouckaert
     *
     * @return int - exercise ID
     */
    public function selectId()
    {
        return $this->id;
    }

    /**
     * returns the exercise title.
     *
     * @author Olivier Brouckaert
     *
     * @param bool $unformattedText Optional. Get the title without HTML tags
     *
     * @return string - exercise title
     */
    public function selectTitle($unformattedText = false)
    {
        if ($unformattedText) {
            return $this->getUnformattedTitle();
        }

        return $this->exercise;
    }

    /**
     * returns the number of attempts setted.
     *
     * @return int - exercise attempts
     */
    public function selectAttempts()
    {
        return $this->attempts;
    }

    /**
     * Returns the number of FeedbackType
     *  0: Feedback , 1: DirectFeedback, 2: NoFeedback.
     *
     * @return int - exercise attempts
     */
    public function getFeedbackType()
    {
        return (int) $this->feedback_type;
    }

    /**
     * returns the time limit.
     *
     * @return int
     */
    public function selectTimeLimit()
    {
        return $this->timeLimit;
    }

    /**
     * returns the exercise description.
     *
     * @author Olivier Brouckaert
     *
     * @return string - exercise description
     */
    public function selectDescription()
    {
        return $this->description;
    }

    /**
     * returns the exercise sound file.
     *
     * @author Olivier Brouckaert
     *
     * @return string - exercise description
     */
    public function selectSound()
    {
        return $this->sound;
    }

    /**
     * returns the exercise type.
     *
     * @author Olivier Brouckaert
     *
     * @return int - exercise type
     */
    public function selectType()
    {
        return $this->type;
    }

    /**
     * @return int
     */
    public function getModelType()
    {
        return $this->modelType;
    }

    /**
     * @return int
     */
    public function selectEndButton()
    {
        return $this->endButton;
    }

    /**
     * @author hubert borderiou 30-11-11
     *
     * @return int : do we display the question category name for students
     */
    public function selectDisplayCategoryName()
    {
        return $this->display_category_name;
    }

    /**
     * @return int
     */
    public function selectPassPercentage()
    {
        return $this->pass_percentage;
    }

    /**
     * Modify object to update the switch display_category_name.
     *
     * @author hubert borderiou 30-11-11
     *
     * @param int $value is an integer 0 or 1
     */
    public function updateDisplayCategoryName($value)
    {
        $this->display_category_name = $value;
    }

    /**
     * @author hubert borderiou 28-11-11
     *
     * @return string html text : the text to display ay the end of the test
     */
    public function getTextWhenFinished()
    {
        return $this->text_when_finished;
    }

    /**
     * @param string $text
     *
     * @author hubert borderiou 28-11-11
     */
    public function updateTextWhenFinished($text)
    {
        $this->text_when_finished = $text;
    }

    /**
     * return 1 or 2 if randomByCat.
     *
     * @author hubert borderiou
     *
     * @return int - quiz random by category
     */
    public function getRandomByCategory()
    {
        return $this->randomByCat;
    }

    /**
     * return 0 if no random by cat
     * return 1 if random by cat, categories shuffled
     * return 2 if random by cat, categories sorted by alphabetic order.
     *
     * @author hubert borderiou
     *
     * @return int - quiz random by category
     */
    public function isRandomByCat()
    {
        $res = EXERCISE_CATEGORY_RANDOM_DISABLED;
        if ($this->randomByCat == EXERCISE_CATEGORY_RANDOM_SHUFFLED) {
            $res = EXERCISE_CATEGORY_RANDOM_SHUFFLED;
        } elseif ($this->randomByCat == EXERCISE_CATEGORY_RANDOM_ORDERED) {
            $res = EXERCISE_CATEGORY_RANDOM_ORDERED;
        }

        return $res;
    }

    /**
     * return nothing
     * update randomByCat value for object.
     *
     * @param int $random
     *
     * @author hubert borderiou
     */
    public function updateRandomByCat($random)
    {
        $this->randomByCat = EXERCISE_CATEGORY_RANDOM_DISABLED;
        if (in_array(
            $random,
            [
                EXERCISE_CATEGORY_RANDOM_SHUFFLED,
                EXERCISE_CATEGORY_RANDOM_ORDERED,
                EXERCISE_CATEGORY_RANDOM_DISABLED,
            ]
        )) {
            $this->randomByCat = $random;
        }
    }

    /**
     * Tells if questions are selected randomly, and if so returns the draws.
     *
     * @author Carlos Vargas
     *
     * @return int - results disabled exercise
     */
    public function selectResultsDisabled()
    {
        return $this->results_disabled;
    }

    /**
     * tells if questions are selected randomly, and if so returns the draws.
     *
     * @author Olivier Brouckaert
     *
     * @return bool
     */
    public function isRandom()
    {
        $isRandom = false;
        // "-1" means all questions will be random
        if ($this->random > 0 || $this->random == -1) {
            $isRandom = true;
        }

        return $isRandom;
    }

    /**
     * returns random answers status.
     *
     * @author Juan Carlos Rana
     */
    public function getRandomAnswers()
    {
        return $this->random_answers;
    }

    /**
     * Same as isRandom() but has a name applied to values different than 0 or 1.
     *
     * @return int
     */
    public function getShuffle()
    {
        return $this->random;
    }

    /**
     * returns the exercise status (1 = enabled ; 0 = disabled).
     *
     * @author Olivier Brouckaert
     *
     * @return int - 1 if enabled, otherwise 0
     */
    public function selectStatus()
    {
        return $this->active;
    }

    /**
     * If false the question list will be managed as always if true
     * the question will be filtered
     * depending of the exercise settings (table c_quiz_rel_category).
     *
     * @param bool $status active or inactive grouping
     */
    public function setCategoriesGrouping($status)
    {
        $this->categories_grouping = (bool) $status;
    }

    /**
     * @return int
     */
    public function getHideQuestionTitle()
    {
        return $this->hideQuestionTitle;
    }

    /**
     * @param $value
     */
    public function setHideQuestionTitle($value)
    {
        $this->hideQuestionTitle = (int) $value;
    }

    /**
     * @return int
     */
    public function getScoreTypeModel()
    {
        return $this->scoreTypeModel;
    }

    /**
     * @param int $value
     */
    public function setScoreTypeModel($value)
    {
        $this->scoreTypeModel = (int) $value;
    }

    /**
     * @return int
     */
    public function getGlobalCategoryId()
    {
        return $this->globalCategoryId;
    }

    /**
     * @param int $value
     */
    public function setGlobalCategoryId($value)
    {
        if (is_array($value) && isset($value[0])) {
            $value = $value[0];
        }
        $this->globalCategoryId = (int) $value;
    }

    /**
     * @param int    $start
     * @param int    $limit
     * @param int    $sidx
     * @param string $sord
     * @param array  $whereCondition
     * @param array  $extraFields
     *
     * @return array
     */
    public function getQuestionListPagination(
        $start,
        $limit,
        $sidx,
        $sord,
        $whereCondition = [],
        $extraFields = []
    ) {
        if (!empty($this->id)) {
            $category_list = TestCategory::getListOfCategoriesNameForTest(
                $this->id,
                false
            );
            $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
            $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);

            $sql = "SELECT q.iid
                    FROM $TBL_EXERCICE_QUESTION e 
                    INNER JOIN $TBL_QUESTIONS  q
                    ON (e.question_id = q.id AND e.c_id = ".$this->course_id." )
					WHERE e.exercice_id	= '".$this->id."' ";

            $orderCondition = ' ORDER BY question_order ';

            if (!empty($sidx) && !empty($sord)) {
                if ($sidx === 'question') {
                    if (in_array(strtolower($sord), ['desc', 'asc'])) {
                        $orderCondition = " ORDER BY q.$sidx $sord";
                    }
                }
            }

            $sql .= $orderCondition;
            $limitCondition = null;
            if (isset($start) && isset($limit)) {
                $start = (int) $start;
                $limit = (int) $limit;
                $limitCondition = " LIMIT $start, $limit";
            }
            $sql .= $limitCondition;
            $result = Database::query($sql);
            $questions = [];
            if (Database::num_rows($result)) {
                if (!empty($extraFields)) {
                    $extraFieldValue = new ExtraFieldValue('question');
                }
                while ($question = Database::fetch_array($result, 'ASSOC')) {
                    /** @var Question $objQuestionTmp */
                    $objQuestionTmp = Question::read($question['iid']);
                    $category_labels = TestCategory::return_category_labels(
                        $objQuestionTmp->category_list,
                        $category_list
                    );

                    if (empty($category_labels)) {
                        $category_labels = '-';
                    }

                    // Question type
                    list($typeImg, $typeExpl) = $objQuestionTmp->get_type_icon_html();

                    $question_media = null;
                    if (!empty($objQuestionTmp->parent_id)) {
                        $objQuestionMedia = Question::read($objQuestionTmp->parent_id);
                        $question_media = Question::getMediaLabel($objQuestionMedia->question);
                    }

                    $questionType = Display::tag(
                        'div',
                        Display::return_icon($typeImg, $typeExpl, [], ICON_SIZE_MEDIUM).$question_media
                    );

                    $question = [
                        'id' => $question['iid'],
                        'question' => $objQuestionTmp->selectTitle(),
                        'type' => $questionType,
                        'category' => Display::tag(
                            'div',
                            '<a href="#" style="padding:0px; margin:0px;">'.$category_labels.'</a>'
                        ),
                        'score' => $objQuestionTmp->selectWeighting(),
                        'level' => $objQuestionTmp->level,
                    ];

                    if (!empty($extraFields)) {
                        foreach ($extraFields as $extraField) {
                            $value = $extraFieldValue->get_values_by_handler_and_field_id(
                                $question['id'],
                                $extraField['id']
                            );
                            $stringValue = null;
                            if ($value) {
                                $stringValue = $value['field_value'];
                            }
                            $question[$extraField['field_variable']] = $stringValue;
                        }
                    }
                    $questions[] = $question;
                }
            }

            return $questions;
        }
    }

    /**
     * Get question count per exercise from DB (any special treatment).
     *
     * @return int
     */
    public function getQuestionCount()
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT count(q.id) as count
                FROM $TBL_EXERCICE_QUESTION e 
                INNER JOIN $TBL_QUESTIONS q
                ON (e.question_id = q.id AND e.c_id = q.c_id)
                WHERE 
                    e.c_id = {$this->course_id} AND 
                    e.exercice_id = ".$this->id;
        $result = Database::query($sql);

        $count = 0;
        if (Database::num_rows($result)) {
            $row = Database::fetch_array($result);
            $count = (int) $row['count'];
        }

        return $count;
    }

    /**
     * @return array
     */
    public function getQuestionOrderedListByName()
    {
        if (empty($this->course_id) || empty($this->id)) {
            return [];
        }

        $exerciseQuestionTable = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $questionTable = Database::get_course_table(TABLE_QUIZ_QUESTION);

        // Getting question list from the order (question list drag n drop interface ).
        $sql = "SELECT e.question_id
                FROM $exerciseQuestionTable e 
                INNER JOIN $questionTable q
                ON (e.question_id= q.id AND e.c_id = q.c_id)
                WHERE 
                    e.c_id = {$this->course_id} AND 
                    e.exercice_id = '".$this->id."'
                ORDER BY q.question";
        $result = Database::query($sql);
        $list = [];
        if (Database::num_rows($result)) {
            $list = Database::store_result($result, 'ASSOC');
        }

        return $list;
    }

    /**
     * Selecting question list depending in the exercise-category
     * relationship (category table in exercise settings).
     *
     * @param array $question_list
     * @param int   $questionSelectionType
     *
     * @return array
     */
    public function getQuestionListWithCategoryListFilteredByCategorySettings(
        $question_list,
        $questionSelectionType
    ) {
        $result = [
            'question_list' => [],
            'category_with_questions_list' => [],
        ];

        // Order/random categories
        $cat = new TestCategory();

        // Setting category order.
        switch ($questionSelectionType) {
            case EX_Q_SELECTION_ORDERED: // 1
            case EX_Q_SELECTION_RANDOM:  // 2
                // This options are not allowed here.
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED: // 3
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'title ASC',
                    false,
                    true
                );

                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );

                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED: // 4
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED: // 7
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    null,
                    true,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM: // 5
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'title ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM: // 6
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED:
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    null,
                    true,
                    true
                );

                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );

                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED: // 7
                break;
            case EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED: // 8
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED: // 9
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'root ASC, lft ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    false
                );
                break;
            case EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM: // 10
                $categoriesAddedInExercise = $cat->getCategoryExerciseTree(
                    $this,
                    $this->course['real_id'],
                    'root, lft ASC',
                    false,
                    true
                );
                $questions_by_category = TestCategory::getQuestionsByCat(
                    $this->id,
                    $question_list,
                    $categoriesAddedInExercise
                );
                $question_list = $this->pickQuestionsPerCategory(
                    $categoriesAddedInExercise,
                    $question_list,
                    $questions_by_category,
                    true,
                    true
                );
                break;
        }

        $result['question_list'] = isset($question_list) ? $question_list : [];
        $result['category_with_questions_list'] = isset($questions_by_category) ? $questions_by_category : [];
        $parentsLoaded = [];
        // Adding category info in the category list with question list:
        if (!empty($questions_by_category)) {
            $newCategoryList = [];
            $em = Database::getManager();

            foreach ($questions_by_category as $categoryId => $questionList) {
                $cat = new TestCategory();
                $cat = $cat->getCategory($categoryId);
                if ($cat) {
                    $cat = (array) $cat;
                    $cat['iid'] = $cat['id'];
                }

                $categoryParentInfo = null;
                // Parent is not set no loop here
                if (isset($cat['parent_id']) && !empty($cat['parent_id'])) {
                    /** @var \Chamilo\CourseBundle\Entity\CQuizCategory $categoryEntity */
                    if (!isset($parentsLoaded[$cat['parent_id']])) {
                        $categoryEntity = $em->find('ChamiloCoreBundle:CQuizCategory', $cat['parent_id']);
                        $parentsLoaded[$cat['parent_id']] = $categoryEntity;
                    } else {
                        $categoryEntity = $parentsLoaded[$cat['parent_id']];
                    }
                    $repo = $em->getRepository('ChamiloCoreBundle:CQuizCategory');
                    $path = $repo->getPath($categoryEntity);

                    $index = 0;
                    if ($this->categoryMinusOne) {
                        //$index = 1;
                    }

                    /** @var \Chamilo\CourseBundle\Entity\CQuizCategory $categoryParent */
                    foreach ($path as $categoryParent) {
                        $visibility = $categoryParent->getVisibility();
                        if ($visibility == 0) {
                            $categoryParentId = $categoryId;
                            $categoryTitle = $cat['title'];
                            if (count($path) > 1) {
                                continue;
                            }
                        } else {
                            $categoryParentId = $categoryParent->getIid();
                            $categoryTitle = $categoryParent->getTitle();
                        }

                        $categoryParentInfo['id'] = $categoryParentId;
                        $categoryParentInfo['iid'] = $categoryParentId;
                        $categoryParentInfo['parent_path'] = null;
                        $categoryParentInfo['title'] = $categoryTitle;
                        $categoryParentInfo['name'] = $categoryTitle;
                        $categoryParentInfo['parent_id'] = null;
                        break;
                    }
                }
                $cat['parent_info'] = $categoryParentInfo;
                $newCategoryList[$categoryId] = [
                    'category' => $cat,
                    'question_list' => $questionList,
                ];
            }

            $result['category_with_questions_list'] = $newCategoryList;
        }

        return $result;
    }

    /**
     * returns the array with the question ID list.
     *
     * @param bool $fromDatabase Whether the results should be fetched in the database or just from memory
     * @param bool $adminView    Whether we should return all questions (admin view) or
     *                           just a list limited by the max number of random questions
     *
     * @author Olivier Brouckaert
     *
     * @return array - question ID list
     */
    public function selectQuestionList($fromDatabase = false, $adminView = false)
    {
        if ($fromDatabase && !empty($this->id)) {
            $nbQuestions = $this->getQuestionCount();
            $questionSelectionType = $this->getQuestionSelectionType();

            switch ($questionSelectionType) {
                case EX_Q_SELECTION_ORDERED:
                    $questionList = $this->getQuestionOrderedList();
                    break;
                case EX_Q_SELECTION_RANDOM:
                    // Not a random exercise, or if there are not at least 2 questions
                    if ($this->random == 0 || $nbQuestions < 2) {
                        $questionList = $this->getQuestionOrderedList();
                    } else {
                        $questionList = $this->getRandomList($adminView);
                    }
                    break;
                default:
                    $questionList = $this->getQuestionOrderedList();
                    $result = $this->getQuestionListWithCategoryListFilteredByCategorySettings(
                        $questionList,
                        $questionSelectionType
                    );
                    $this->categoryWithQuestionList = $result['category_with_questions_list'];
                    $questionList = $result['question_list'];
                    break;
            }

            return $questionList;
        }

        return $this->questionList;
    }

    /**
     * returns the number of questions in this exercise.
     *
     * @author Olivier Brouckaert
     *
     * @return int - number of questions
     */
    public function selectNbrQuestions()
    {
        return count($this->questionList);
    }

    /**
     * @return int
     */
    public function selectPropagateNeg()
    {
        return $this->propagate_neg;
    }

    /**
     * @return int
     */
    public function getSaveCorrectAnswers()
    {
        return $this->saveCorrectAnswers;
    }

    /**
     * Selects questions randomly in the question list.
     *
     * @author Olivier Brouckaert
     * @author Hubert Borderiou 15 nov 2011
     *
     * @param bool $adminView Whether we should return all
     *                        questions (admin view) or just a list limited by the max number of random questions
     *
     * @return array - if the exercise is not set to take questions randomly, returns the question list
     *               without randomizing, otherwise, returns the list with questions selected randomly
     */
    public function getRandomList($adminView = false)
    {
        $quizRelQuestion = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $random = isset($this->random) && !empty($this->random) ? $this->random : 0;

        // Random with limit
        $randomLimit = " ORDER BY RAND() LIMIT $random";

        // Random with no limit
        if ($random == -1) {
            $randomLimit = ' ORDER BY RAND() ';
        }

        // Admin see the list in default order
        if ($adminView === true) {
            // If viewing it as admin for edition, don't show it randomly, use title + id
            $randomLimit = 'ORDER BY e.question_order';
        }

        $sql = "SELECT e.question_id
                FROM $quizRelQuestion e 
                INNER JOIN $question q
                ON (e.question_id= q.id AND e.c_id = q.c_id)
                WHERE 
                    e.c_id = {$this->course_id} AND 
                    e.exercice_id = '".Database::escape_string($this->id)."'
                    $randomLimit ";
        $result = Database::query($sql);
        $questionList = [];
        while ($row = Database::fetch_object($result)) {
            $questionList[] = $row->question_id;
        }

        return $questionList;
    }

    /**
     * returns 'true' if the question ID is in the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if in the list, otherwise false
     */
    public function isInList($questionId)
    {
        $inList = false;
        if (is_array($this->questionList)) {
            $inList = in_array($questionId, $this->questionList);
        }

        return $inList;
    }

    /**
     * If current exercise has a question.
     *
     * @param int $questionId
     *
     * @return int
     */
    public function hasQuestion($questionId)
    {
        $questionId = (int) $questionId;

        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT q.id
                FROM $TBL_EXERCICE_QUESTION e 
                INNER JOIN $TBL_QUESTIONS q
                ON (e.question_id = q.id AND e.c_id = q.c_id)
                WHERE 
                    q.id = $questionId AND
                    e.c_id = {$this->course_id} AND 
                    e.exercice_id = ".$this->id;

        $result = Database::query($sql);

        return Database::num_rows($result) > 0;
    }

    /**
     * changes the exercise title.
     *
     * @author Olivier Brouckaert
     *
     * @param string $title - exercise title
     */
    public function updateTitle($title)
    {
        $this->title = $this->exercise = $title;
    }

    /**
     * changes the exercise max attempts.
     *
     * @param int $attempts - exercise max attempts
     */
    public function updateAttempts($attempts)
    {
        $this->attempts = $attempts;
    }

    /**
     * changes the exercise feedback type.
     *
     * @param int $feedback_type
     */
    public function updateFeedbackType($feedback_type)
    {
        $this->feedback_type = $feedback_type;
    }

    /**
     * changes the exercise description.
     *
     * @author Olivier Brouckaert
     *
     * @param string $description - exercise description
     */
    public function updateDescription($description)
    {
        $this->description = $description;
    }

    /**
     * changes the exercise expired_time.
     *
     * @author Isaac flores
     *
     * @param int $expired_time The expired time of the quiz
     */
    public function updateExpiredTime($expired_time)
    {
        $this->expired_time = $expired_time;
    }

    /**
     * @param $value
     */
    public function updatePropagateNegative($value)
    {
        $this->propagate_neg = $value;
    }

    /**
     * @param $value int
     */
    public function updateSaveCorrectAnswers($value)
    {
        $this->saveCorrectAnswers = (int) $value;
    }

    /**
     * @param $value
     */
    public function updateReviewAnswers($value)
    {
        $this->review_answers = isset($value) && $value ? true : false;
    }

    /**
     * @param $value
     */
    public function updatePassPercentage($value)
    {
        $this->pass_percentage = $value;
    }

    /**
     * @param string $text
     */
    public function updateEmailNotificationTemplate($text)
    {
        $this->emailNotificationTemplate = $text;
    }

    /**
     * @param string $text
     */
    public function setEmailNotificationTemplateToUser($text)
    {
        $this->emailNotificationTemplateToUser = $text;
    }

    /**
     * @param string $value
     */
    public function setNotifyUserByEmail($value)
    {
        $this->notifyUserByEmail = $value;
    }

    /**
     * @param int $value
     */
    public function updateEndButton($value)
    {
        $this->endButton = (int) $value;
    }

    /**
     * @param string $value
     */
    public function setOnSuccessMessage($value)
    {
        $this->onSuccessMessage = $value;
    }

    /**
     * @param string $value
     */
    public function setOnFailedMessage($value)
    {
        $this->onFailedMessage = $value;
    }

    /**
     * @param $value
     */
    public function setModelType($value)
    {
        $this->modelType = (int) $value;
    }

    /**
     * @param int $value
     */
    public function setQuestionSelectionType($value)
    {
        $this->questionSelectionType = (int) $value;
    }

    /**
     * @return int
     */
    public function getQuestionSelectionType()
    {
        return (int) $this->questionSelectionType;
    }

    /**
     * @param array $categories
     */
    public function updateCategories($categories)
    {
        if (!empty($categories)) {
            $categories = array_map('intval', $categories);
            $this->categories = $categories;
        }
    }

    /**
     * changes the exercise sound file.
     *
     * @author Olivier Brouckaert
     *
     * @param string $sound  - exercise sound file
     * @param string $delete - ask to delete the file
     */
    public function updateSound($sound, $delete)
    {
        global $audioPath, $documentPath;
        $TBL_DOCUMENT = Database::get_course_table(TABLE_DOCUMENT);

        if ($sound['size'] && (strstr($sound['type'], 'audio') || strstr($sound['type'], 'video'))) {
            $this->sound = $sound['name'];

            if (@move_uploaded_file($sound['tmp_name'], $audioPath.'/'.$this->sound)) {
                $sql = "SELECT 1 FROM $TBL_DOCUMENT
                        WHERE 
                            c_id = ".$this->course_id." AND 
                            path = '".str_replace($documentPath, '', $audioPath).'/'.$this->sound."'";
                $result = Database::query($sql);

                if (!Database::num_rows($result)) {
                    $id = add_document(
                        $this->course,
                        str_replace($documentPath, '', $audioPath).'/'.$this->sound,
                        'file',
                        $sound['size'],
                        $sound['name']
                    );
                    api_item_property_update(
                        $this->course,
                        TOOL_DOCUMENT,
                        $id,
                        'DocumentAdded',
                        api_get_user_id()
                    );
                    item_property_update_on_folder(
                        $this->course,
                        str_replace($documentPath, '', $audioPath),
                        api_get_user_id()
                    );
                }
            }
        } elseif ($delete && is_file($audioPath.'/'.$this->sound)) {
            $this->sound = '';
        }
    }

    /**
     * changes the exercise type.
     *
     * @author Olivier Brouckaert
     *
     * @param int $type - exercise type
     */
    public function updateType($type)
    {
        $this->type = $type;
    }

    /**
     * sets to 0 if questions are not selected randomly
     * if questions are selected randomly, sets the draws.
     *
     * @author Olivier Brouckaert
     *
     * @param int $random - 0 if not random, otherwise the draws
     */
    public function setRandom($random)
    {
        $this->random = $random;
    }

    /**
     * sets to 0 if answers are not selected randomly
     * if answers are selected randomly.
     *
     * @author Juan Carlos Rana
     *
     * @param int $random_answers - random answers
     */
    public function updateRandomAnswers($random_answers)
    {
        $this->random_answers = $random_answers;
    }

    /**
     * enables the exercise.
     *
     * @author Olivier Brouckaert
     */
    public function enable()
    {
        $this->active = 1;
    }

    /**
     * disables the exercise.
     *
     * @author Olivier Brouckaert
     */
    public function disable()
    {
        $this->active = 0;
    }

    /**
     * Set disable results.
     */
    public function disable_results()
    {
        $this->results_disabled = true;
    }

    /**
     * Enable results.
     */
    public function enable_results()
    {
        $this->results_disabled = false;
    }

    /**
     * @param int $results_disabled
     */
    public function updateResultsDisabled($results_disabled)
    {
        $this->results_disabled = (int) $results_disabled;
    }

    /**
     * updates the exercise in the data base.
     *
     * @param string $type_e
     *
     * @author Olivier Brouckaert
     */
    public function save($type_e = '')
    {
        $_course = $this->course;
        $TBL_EXERCISES = Database::get_course_table(TABLE_QUIZ_TEST);

        $id = $this->id;
        $exercise = $this->exercise;
        $description = $this->description;
        $sound = $this->sound;
        $type = $this->type;
        $attempts = isset($this->attempts) ? $this->attempts : 0;
        $feedback_type = isset($this->feedback_type) ? $this->feedback_type : 0;
        $random = $this->random;
        $random_answers = $this->random_answers;
        $active = $this->active;
        $propagate_neg = (int) $this->propagate_neg;
        $saveCorrectAnswers = isset($this->saveCorrectAnswers) ? (int) $this->saveCorrectAnswers : 0;
        $review_answers = isset($this->review_answers) && $this->review_answers ? 1 : 0;
        $randomByCat = (int) $this->randomByCat;
        $text_when_finished = $this->text_when_finished;
        $display_category_name = (int) $this->display_category_name;
        $pass_percentage = (int) $this->pass_percentage;
        $session_id = $this->sessionId;

        // If direct we do not show results
        $results_disabled = (int) $this->results_disabled;
        if (in_array($feedback_type, [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
            $results_disabled = 0;
        }
        $expired_time = (int) $this->expired_time;

        // Exercise already exists
        if ($id) {
            // we prepare date in the database using the api_get_utc_datetime() function
            $start_time = null;
            if (!empty($this->start_time)) {
                $start_time = $this->start_time;
            }

            $end_time = null;
            if (!empty($this->end_time)) {
                $end_time = $this->end_time;
            }

            $params = [
                'title' => $exercise,
                'description' => $description,
            ];

            $paramsExtra = [];
            if ($type_e != 'simple') {
                $paramsExtra = [
                    'sound' => $sound,
                    'type' => $type,
                    'random' => $random,
                    'random_answers' => $random_answers,
                    'active' => $active,
                    'feedback_type' => $feedback_type,
                    'start_time' => $start_time,
                    'end_time' => $end_time,
                    'max_attempt' => $attempts,
                    'expired_time' => $expired_time,
                    'propagate_neg' => $propagate_neg,
                    'save_correct_answers' => $saveCorrectAnswers,
                    'review_answers' => $review_answers,
                    'random_by_category' => $randomByCat,
                    'text_when_finished' => $text_when_finished,
                    'display_category_name' => $display_category_name,
                    'pass_percentage' => $pass_percentage,
                    'results_disabled' => $results_disabled,
                    'question_selection_type' => $this->getQuestionSelectionType(),
                    'hide_question_title' => $this->getHideQuestionTitle(),
                ];

                $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
                if ($allow === true) {
                    $paramsExtra['show_previous_button'] = $this->showPreviousButton();
                }

                $allow = api_get_configuration_value('allow_exercise_categories');
                if ($allow === true) {
                    $paramsExtra['exercise_category_id'] = $this->getExerciseCategoryId();
                }

                $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
                if ($allow === true) {
                    $notifications = $this->getNotifications();
                    $notifications = implode(',', $notifications);
                    $paramsExtra['notifications'] = $notifications;
                }

                $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
                if ($pageConfig && !empty($this->pageResultConfiguration)) {
                    $paramsExtra['page_result_configuration'] = $this->pageResultConfiguration;
                }
            }

            $params = array_merge($params, $paramsExtra);

            Database::update(
                $TBL_EXERCISES,
                $params,
                ['c_id = ? AND id = ?' => [$this->course_id, $id]]
            );

            // update into the item_property table
            api_item_property_update(
                $_course,
                TOOL_QUIZ,
                $id,
                'QuizUpdated',
                api_get_user_id()
            );

            if (api_get_setting('search_enabled') == 'true') {
                $this->search_engine_edit();
            }
        } else {
            // Creates a new exercise
            // In this case of new exercise, we don't do the api_get_utc_datetime()
            // for date because, bellow, we call function api_set_default_visibility()
            // In this function, api_set_default_visibility,
            // the Quiz is saved too, with an $id and api_get_utc_datetime() is done.
            // If we do it now, it will be done twice (cf. https://support.chamilo.org/issues/6586)
            $start_time = null;
            if (!empty($this->start_time)) {
                $start_time = $this->start_time;
            }

            $end_time = null;
            if (!empty($this->end_time)) {
                $end_time = $this->end_time;
            }

            $params = [
                'c_id' => $this->course_id,
                'start_time' => $start_time,
                'end_time' => $end_time,
                'title' => $exercise,
                'description' => $description,
                'sound' => $sound,
                'type' => $type,
                'random' => $random,
                'random_answers' => $random_answers,
                'active' => $active,
                'results_disabled' => $results_disabled,
                'max_attempt' => $attempts,
                'feedback_type' => $feedback_type,
                'expired_time' => $expired_time,
                'session_id' => $session_id,
                'review_answers' => $review_answers,
                'random_by_category' => $randomByCat,
                'text_when_finished' => $text_when_finished,
                'display_category_name' => $display_category_name,
                'pass_percentage' => $pass_percentage,
                'save_correct_answers' => $saveCorrectAnswers,
                'propagate_neg' => $propagate_neg,
                'hide_question_title' => $this->getHideQuestionTitle(),
            ];

            $allow = api_get_configuration_value('allow_exercise_categories');
            if ($allow === true) {
                $params['exercise_category_id'] = $this->getExerciseCategoryId();
            }

            $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
            if ($allow === true) {
                $params['show_previous_button'] = $this->showPreviousButton();
            }

            $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
            if ($allow === true) {
                $notifications = $this->getNotifications();
                $params['notifications'] = '';
                if (!empty($notifications)) {
                    $notifications = implode(',', $notifications);
                    $params['notifications'] = $notifications;
                }
            }

            $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
            if ($pageConfig && !empty($this->pageResultConfiguration)) {
                $params['page_result_configuration'] = $this->pageResultConfiguration;
            }

            $this->id = $this->iId = Database::insert($TBL_EXERCISES, $params);

            if ($this->id) {
                $sql = "UPDATE $TBL_EXERCISES SET id = iid WHERE iid = {$this->id} ";
                Database::query($sql);

                $sql = "UPDATE $TBL_EXERCISES
                        SET question_selection_type= ".$this->getQuestionSelectionType()."
                        WHERE id = ".$this->id." AND c_id = ".$this->course_id;
                Database::query($sql);

                // insert into the item_property table
                api_item_property_update(
                    $this->course,
                    TOOL_QUIZ,
                    $this->id,
                    'QuizAdded',
                    api_get_user_id()
                );

                // This function save the quiz again, carefull about start_time
                // and end_time if you remove this line (see above)
                api_set_default_visibility(
                    $this->id,
                    TOOL_QUIZ,
                    null,
                    $this->course
                );

                if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
                    $this->search_engine_save();
                }
            }
        }

        $this->save_categories_in_exercise($this->categories);

        // Updates the question position
        $this->update_question_positions();

        return $this->iId;
    }

    /**
     * Updates question position.
     *
     * @return bool
     */
    public function update_question_positions()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        // Fixes #3483 when updating order
        $questionList = $this->selectQuestionList(true);

        $this->id = (int) $this->id;

        if (empty($this->id)) {
            return false;
        }

        if (!empty($questionList)) {
            foreach ($questionList as $position => $questionId) {
                $position = (int) $position;
                $questionId = (int) $questionId;
                $sql = "UPDATE $table SET
                            question_order ='".$position."'
                        WHERE
                            c_id = ".$this->course_id." AND
                            question_id = ".$questionId." AND
                            exercice_id=".$this->id;
                Database::query($sql);
            }
        }

        return true;
    }

    /**
     * Adds a question into the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if the question has been added, otherwise false
     */
    public function addToList($questionId)
    {
        // checks if the question ID is not in the list
        if (!$this->isInList($questionId)) {
            // selects the max position
            if (!$this->selectNbrQuestions()) {
                $pos = 1;
            } else {
                if (is_array($this->questionList)) {
                    $pos = max(array_keys($this->questionList)) + 1;
                }
            }
            $this->questionList[$pos] = $questionId;

            return true;
        }

        return false;
    }

    /**
     * removes a question from the question list.
     *
     * @author Olivier Brouckaert
     *
     * @param int $questionId - question ID
     *
     * @return bool - true if the question has been removed, otherwise false
     */
    public function removeFromList($questionId)
    {
        // searches the position of the question ID in the list
        $pos = array_search($questionId, $this->questionList);
        // question not found
        if ($pos === false) {
            return false;
        } else {
            // dont reduce the number of random question if we use random by category option, or if
            // random all questions
            if ($this->isRandom() && $this->isRandomByCat() == 0) {
                if (count($this->questionList) >= $this->random && $this->random > 0) {
                    $this->random--;
                    $this->save();
                }
            }
            // deletes the position from the array containing the wanted question ID
            unset($this->questionList[$pos]);

            return true;
        }
    }

    /**
     * deletes the exercise from the database
     * Notice : leaves the question in the data base.
     *
     * @author Olivier Brouckaert
     */
    public function delete()
    {
        $limitTeacherAccess = api_get_configuration_value('limit_exercise_teacher_access');

        if ($limitTeacherAccess && !api_is_platform_admin()) {
            return false;
        }

        $locked = api_resource_is_locked_by_gradebook(
            $this->id,
            LINK_EXERCISE
        );

        if ($locked) {
            return false;
        }

        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET active='-1'
                WHERE c_id = ".$this->course_id." AND id = ".intval($this->id);
        Database::query($sql);

        api_item_property_update(
            $this->course,
            TOOL_QUIZ,
            $this->id,
            'QuizDeleted',
            api_get_user_id()
        );
        api_item_property_update(
            $this->course,
            TOOL_QUIZ,
            $this->id,
            'delete',
            api_get_user_id()
        );

        Skill::deleteSkillsFromItem($this->iId, ITEM_TYPE_EXERCISE);

        if (api_get_setting('search_enabled') === 'true' &&
            extension_loaded('xapian')
        ) {
            $this->search_engine_delete();
        }

        $linkInfo = GradebookUtils::isResourceInCourseGradebook(
            $this->course['code'],
            LINK_EXERCISE,
            $this->id,
            $this->sessionId
        );
        if ($linkInfo !== false) {
            GradebookUtils::remove_resource_from_course_gradebook($linkInfo['id']);
        }

        return true;
    }

    /**
     * Creates the form to create / edit an exercise.
     *
     * @param FormValidator $form
     * @param string        $type
     */
    public function createForm($form, $type = 'full')
    {
        if (empty($type)) {
            $type = 'full';
        }

        // Form title
        $form_title = get_lang('NewEx');
        if (!empty($_GET['exerciseId'])) {
            $form_title = get_lang('ModifyExercise');
        }

        $form->addHeader($form_title);

        // Title.
        if (api_get_configuration_value('save_titles_as_html')) {
            $form->addHtmlEditor(
                'exerciseTitle',
                get_lang('ExerciseName'),
                false,
                false,
                ['ToolbarSet' => 'Minimal']
            );
        } else {
            $form->addElement(
                'text',
                'exerciseTitle',
                get_lang('ExerciseName'),
                ['id' => 'exercise_title']
            );
        }

        $form->addElement('advanced_settings', 'advanced_params', get_lang('AdvancedParameters'));
        $form->addElement('html', '<div id="advanced_params_options" style="display:none">');

        if (api_get_configuration_value('allow_exercise_categories')) {
            $categoryManager = new ExerciseCategoryManager();
            $categories = $categoryManager->getCategories(api_get_course_int_id());
            $options = [];
            if (!empty($categories)) {
                /** @var \Chamilo\CourseBundle\Entity\CExerciseCategory $category */
                foreach ($categories as $category) {
                    $options[$category->getId()] = $category->getName();
                }
            }

            $form->addSelect(
                'exercise_category_id',
                get_lang('Category'),
                $options,
                ['placeholder' => get_lang('SelectAnOption')]
            );
        }

        $editor_config = [
            'ToolbarSet' => 'TestQuestionDescription',
            'Width' => '100%',
            'Height' => '150',
        ];

        if (is_array($type)) {
            $editor_config = array_merge($editor_config, $type);
        }

        $form->addHtmlEditor(
            'exerciseDescription',
            get_lang('ExerciseDescription'),
            false,
            false,
            $editor_config
        );

        $skillList = [];
        if ($type === 'full') {
            // Can't modify a DirectFeedback question.
            if (!in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
                $this->setResultFeedbackGroup($form);

                // Type of results display on the final page
                $this->setResultDisabledGroup($form);

                // Type of questions disposition on page
                $radios = [];
                $radios[] = $form->createElement(
                    'radio',
                    'exerciseType',
                    null,
                    get_lang('SimpleExercise'),
                    '1',
                    [
                        'onclick' => 'check_per_page_all()',
                        'id' => 'option_page_all',
                    ]
                );
                $radios[] = $form->createElement(
                    'radio',
                    'exerciseType',
                    null,
                    get_lang('SequentialExercise'),
                    '2',
                    [
                        'onclick' => 'check_per_page_one()',
                        'id' => 'option_page_one',
                    ]
                );

                $form->addGroup($radios, null, get_lang('QuestionsPerPage'));
            } else {
                // if is Direct feedback but has not questions we can allow to modify the question type
                if ($this->getQuestionCount() === 0) {
                    $this->setResultFeedbackGroup($form);
                    $this->setResultDisabledGroup($form);

                    // Type of questions disposition on page
                    $radios = [];
                    $radios[] = $form->createElement('radio', 'exerciseType', null, get_lang('SimpleExercise'), '1');
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SequentialExercise'),
                        '2'
                    );
                    $form->addGroup($radios, null, get_lang('ExerciseType'));
                } else {
                    $group = $this->setResultDisabledGroup($form);
                    $group->freeze();

                    // we force the options to the DirectFeedback exercisetype
                    $form->addElement('hidden', 'exerciseFeedbackType', $this->getFeedbackType());
                    $form->addElement('hidden', 'exerciseType', ONE_PER_PAGE);

                    // Type of questions disposition on page
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SimpleExercise'),
                        '1',
                        [
                            'onclick' => 'check_per_page_all()',
                            'id' => 'option_page_all',
                        ]
                    );
                    $radios[] = $form->createElement(
                        'radio',
                        'exerciseType',
                        null,
                        get_lang('SequentialExercise'),
                        '2',
                        [
                            'onclick' => 'check_per_page_one()',
                            'id' => 'option_page_one',
                        ]
                    );

                    $type_group = $form->addGroup($radios, null, get_lang('QuestionsPerPage'));
                    $type_group->freeze();
                }
            }

            $option = [
                EX_Q_SELECTION_ORDERED => get_lang('OrderedByUser'),
                //  Defined by user
                EX_Q_SELECTION_RANDOM => get_lang('Random'),
                // 1-10, All
                'per_categories' => '--------'.get_lang('UsingCategories').'----------',
                // Base (A 123 {3} B 456 {3} C 789{2} D 0{0}) --> Matrix {3, 3, 2, 0}
                EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED => get_lang('OrderedCategoriesAlphabeticallyWithQuestionsOrdered'),
                // A 123 B 456 C 78 (0, 1, all)
                EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED => get_lang('RandomCategoriesWithQuestionsOrdered'),
                // C 78 B 456 A 123
                EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM => get_lang('OrderedCategoriesAlphabeticallyWithRandomQuestions'),
                // A 321 B 654 C 87
                EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM => get_lang('RandomCategoriesWithRandomQuestions'),
                // C 87 B 654 A 321
                //EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED => get_lang('RandomCategoriesWithQuestionsOrderedNoQuestionGrouped'),
                /*    B 456 C 78 A 123
                        456 78 123
                        123 456 78
                */
                //EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED => get_lang('RandomCategoriesWithRandomQuestionsNoQuestionGrouped'),
                /*
                    A 123 B 456 C 78
                    B 456 C 78 A 123
                    B 654 C 87 A 321
                    654 87 321
                    165 842 73
                */
                //EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED => get_lang('OrderedCategoriesByParentWithQuestionsOrdered'),
                //EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM => get_lang('OrderedCategoriesByParentWithQuestionsRandom'),
            ];

            $form->addElement(
                'select',
                'question_selection_type',
                [get_lang('QuestionSelection')],
                $option,
                [
                    'id' => 'questionSelection',
                    'onchange' => 'checkQuestionSelection()',
                ]
            );

            $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
            if ($pageConfig) {
                $group = [
                    $form->createElement(
                        'checkbox',
                        'hide_expected_answer',
                        null,
                        get_lang('HideExpectedAnswer')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_total_score',
                        null,
                        get_lang('HideTotalScore')
                    ),
                    $form->createElement(
                        'checkbox',
                        'hide_question_score',
                        null,
                        get_lang('HideQuestionScore')
                    ),
                ];
                $form->addGroup($group, null, get_lang('ResultsConfigurationPage'));
            }

            $displayMatrix = 'none';
            $displayRandom = 'none';
            $selectionType = $this->getQuestionSelectionType();
            switch ($selectionType) {
                case EX_Q_SELECTION_RANDOM:
                    $displayRandom = 'block';
                    break;
                case $selectionType >= EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED:
                    $displayMatrix = 'block';
                    break;
            }

            $form->addElement(
                'html',
                '<div id="hidden_random" style="display:'.$displayRandom.'">'
            );
            // Number of random question.
            $max = ($this->id > 0) ? $this->getQuestionCount() : 10;
            $option = range(0, $max);
            $option[0] = get_lang('No');
            $option[-1] = get_lang('AllQuestionsShort');
            $form->addElement(
                'select',
                'randomQuestions',
                [
                    get_lang('RandomQuestions'),
                    get_lang('RandomQuestionsHelp'),
                ],
                $option,
                ['id' => 'randomQuestions']
            );
            $form->addElement('html', '</div>');

            $form->addElement(
                'html',
                '<div id="hidden_matrix" style="display:'.$displayMatrix.'">'
            );

            // Category selection.
            $cat = new TestCategory();
            $cat_form = $cat->returnCategoryForm($this);
            if (empty($cat_form)) {
                $cat_form = '<span class="label label-warning">'.get_lang('NoCategoriesDefined').'</span>';
            }
            $form->addElement('label', null, $cat_form);
            $form->addElement('html', '</div>');

            // Random answers.
            $radios_random_answers = [
                $form->createElement('radio', 'randomAnswers', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'randomAnswers', null, get_lang('No'), '0'),
            ];
            $form->addGroup($radios_random_answers, null, get_lang('RandomAnswers'));

            // Category name.
            $radio_display_cat_name = [
                $form->createElement('radio', 'display_category_name', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'display_category_name', null, get_lang('No'), '0'),
            ];
            $form->addGroup($radio_display_cat_name, null, get_lang('QuestionDisplayCategoryName'));

            // Hide question title.
            $group = [
                $form->createElement('radio', 'hide_question_title', null, get_lang('Yes'), '1'),
                $form->createElement('radio', 'hide_question_title', null, get_lang('No'), '0'),
            ];
            $form->addGroup($group, null, get_lang('HideQuestionTitle'));

            $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');

            if ($allow === true) {
                // Hide question title.
                $group = [
                    $form->createElement(
                        'radio',
                        'show_previous_button',
                        null,
                        get_lang('Yes'),
                        '1'
                    ),
                    $form->createElement(
                        'radio',
                        'show_previous_button',
                        null,
                        get_lang('No'),
                        '0'
                    ),
                ];
                $form->addGroup($group, null, get_lang('ShowPreviousButton'));
            }

            // Attempts
            $attempt_option = range(0, 10);
            $attempt_option[0] = get_lang('Infinite');

            $form->addElement(
                'select',
                'exerciseAttempts',
                get_lang('ExerciseAttempts'),
                $attempt_option,
                ['id' => 'exerciseAttempts']
            );

            // Exercise time limit
            $form->addElement(
                'checkbox',
                'activate_start_date_check',
                null,
                get_lang('EnableStartTime'),
                ['onclick' => 'activate_start_date()']
            );

            if (!empty($this->start_time)) {
                $form->addElement('html', '<div id="start_date_div" style="display:block;">');
            } else {
                $form->addElement('html', '<div id="start_date_div" style="display:none;">');
            }

            $form->addElement('date_time_picker', 'start_time');
            $form->addElement('html', '</div>');
            $form->addElement(
                'checkbox',
                'activate_end_date_check',
                null,
                get_lang('EnableEndTime'),
                ['onclick' => 'activate_end_date()']
            );

            if (!empty($this->end_time)) {
                $form->addElement('html', '<div id="end_date_div" style="display:block;">');
            } else {
                $form->addElement('html', '<div id="end_date_div" style="display:none;">');
            }

            $form->addElement('date_time_picker', 'end_time');
            $form->addElement('html', '</div>');

            $display = 'block';
            $form->addElement(
                'checkbox',
                'propagate_neg',
                null,
                get_lang('PropagateNegativeResults')
            );

            if (api_get_configuration_value('allow_quiz_save_correct_options')) {
                $options = [
                    '' => get_lang('SelectAnOption'),
                    1 => get_lang('SaveTheCorrectAnswersForTheNextAttempt'),
                    2 => get_lang('SaveAllAnswers'),
                ];
                $form->addSelect(
                    'save_correct_answers',
                    get_lang('SaveAnswers'),
                    $options
                );
            } else {
                $form->addCheckBox(
                    'save_correct_answers',
                    null,
                    get_lang('SaveTheCorrectAnswersForTheNextAttempt')
                );
            }

            $form->addElement('html', '<div class="clear">&nbsp;</div>');
            $form->addElement('checkbox', 'review_answers', null, get_lang('ReviewAnswers'));
            $form->addElement('html', '<div id="divtimecontrol"  style="display:'.$display.';">');

            // Timer control
            $form->addElement(
                'checkbox',
                'enabletimercontrol',
                null,
                get_lang('EnableTimerControl'),
                [
                    'onclick' => 'option_time_expired()',
                    'id' => 'enabletimercontrol',
                    'onload' => 'check_load_time()',
                ]
            );

            $expired_date = (int) $this->selectExpiredTime();

            if (($expired_date != '0')) {
                $form->addElement('html', '<div id="timercontrol" style="display:block;">');
            } else {
                $form->addElement('html', '<div id="timercontrol" style="display:none;">');
            }
            $form->addText(
                'enabletimercontroltotalminutes',
                get_lang('ExerciseTotalDurationInMinutes'),
                false,
                [
                    'id' => 'enabletimercontroltotalminutes',
                    'cols-size' => [2, 2, 8],
                ]
            );
            $form->addElement('html', '</div>');
            $form->addElement(
                'text',
                'pass_percentage',
                [get_lang('PassPercentage'), null, '%'],
                ['id' => 'pass_percentage']
            );

            $form->addRule('pass_percentage', get_lang('Numeric'), 'numeric');
            $form->addRule('pass_percentage', get_lang('ValueTooSmall'), 'min_numeric_length', 0);
            $form->addRule('pass_percentage', get_lang('ValueTooBig'), 'max_numeric_length', 100);

            // add the text_when_finished textbox
            $form->addHtmlEditor(
                'text_when_finished',
                get_lang('TextWhenFinished'),
                false,
                false,
                $editor_config
            );

            $allow = api_get_configuration_value('allow_notification_setting_per_exercise');
            if ($allow === true) {
                $settings = ExerciseLib::getNotificationSettings();
                $group = [];
                foreach ($settings as $itemId => $label) {
                    $group[] = $form->createElement(
                        'checkbox',
                        'notifications[]',
                        null,
                        $label,
                        ['value' => $itemId]
                    );
                }
                $form->addGroup($group, '', [get_lang('EmailNotifications')]);
            }

            $form->addCheckBox(
                'update_title_in_lps',
                null,
                get_lang('UpdateTitleInLps')
            );

            $defaults = [];
            if (api_get_setting('search_enabled') === 'true') {
                require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
                $form->addElement('checkbox', 'index_document', '', get_lang('SearchFeatureDoIndexDocument'));
                $form->addSelectLanguage('language', get_lang('SearchFeatureDocumentLanguage'));
                $specific_fields = get_specific_field_list();

                foreach ($specific_fields as $specific_field) {
                    $form->addElement('text', $specific_field['code'], $specific_field['name']);
                    $filter = [
                        'c_id' => api_get_course_int_id(),
                        'field_id' => $specific_field['id'],
                        'ref_id' => $this->id,
                        'tool_id' => "'".TOOL_QUIZ."'",
                    ];
                    $values = get_specific_field_values_list($filter, ['value']);
                    if (!empty($values)) {
                        $arr_str_values = [];
                        foreach ($values as $value) {
                            $arr_str_values[] = $value['value'];
                        }
                        $defaults[$specific_field['code']] = implode(', ', $arr_str_values);
                    }
                }
            }

            $skillList = Skill::addSkillsToForm($form, ITEM_TYPE_EXERCISE, $this->iId);

            $extraField = new ExtraField('exercise');
            $extraField->addElements(
                $form,
                $this->iId,
                [], //exclude
                false, // filter
                false, // tag as select
                [], //show only fields
                [], // order fields
                [] // extra data
            );
            $form->addElement('html', '</div>'); //End advanced setting
            $form->addElement('html', '</div>');
        }

        // submit
        if (isset($_GET['exerciseId'])) {
            $form->addButtonSave(get_lang('ModifyExercise'), 'submitExercise');
        } else {
            $form->addButtonUpdate(get_lang('ProcedToQuestions'), 'submitExercise');
        }

        $form->addRule('exerciseTitle', get_lang('GiveExerciseName'), 'required');

        // defaults
        if ($type == 'full') {
            // rules
            $form->addRule('exerciseAttempts', get_lang('Numeric'), 'numeric');
            $form->addRule('start_time', get_lang('InvalidDate'), 'datetime');
            $form->addRule('end_time', get_lang('InvalidDate'), 'datetime');

            if ($this->id > 0) {
                $defaults['randomQuestions'] = $this->random;
                $defaults['randomAnswers'] = $this->getRandomAnswers();
                $defaults['exerciseType'] = $this->selectType();
                $defaults['exerciseTitle'] = $this->get_formated_title();
                $defaults['exerciseDescription'] = $this->selectDescription();
                $defaults['exerciseAttempts'] = $this->selectAttempts();
                $defaults['exerciseFeedbackType'] = $this->getFeedbackType();
                $defaults['results_disabled'] = $this->selectResultsDisabled();
                $defaults['propagate_neg'] = $this->selectPropagateNeg();
                $defaults['save_correct_answers'] = $this->getSaveCorrectAnswers();
                $defaults['review_answers'] = $this->review_answers;
                $defaults['randomByCat'] = $this->getRandomByCategory();
                $defaults['text_when_finished'] = $this->getTextWhenFinished();
                $defaults['display_category_name'] = $this->selectDisplayCategoryName();
                $defaults['pass_percentage'] = $this->selectPassPercentage();
                $defaults['question_selection_type'] = $this->getQuestionSelectionType();
                $defaults['hide_question_title'] = $this->getHideQuestionTitle();
                $defaults['show_previous_button'] = $this->showPreviousButton();
                $defaults['exercise_category_id'] = $this->getExerciseCategoryId();

                if (!empty($this->start_time)) {
                    $defaults['activate_start_date_check'] = 1;
                }
                if (!empty($this->end_time)) {
                    $defaults['activate_end_date_check'] = 1;
                }

                $defaults['start_time'] = !empty($this->start_time) ? api_get_local_time($this->start_time) : date('Y-m-d 12:00:00');
                $defaults['end_time'] = !empty($this->end_time) ? api_get_local_time($this->end_time) : date('Y-m-d 12:00:00', time() + 84600);

                // Get expired time
                if ($this->expired_time != '0') {
                    $defaults['enabletimercontrol'] = 1;
                    $defaults['enabletimercontroltotalminutes'] = $this->expired_time;
                } else {
                    $defaults['enabletimercontroltotalminutes'] = 0;
                }
                $defaults['skills'] = array_keys($skillList);
                $defaults['notifications'] = $this->getNotifications();
            } else {
                $defaults['exerciseType'] = 2;
                $defaults['exerciseAttempts'] = 0;
                $defaults['randomQuestions'] = 0;
                $defaults['randomAnswers'] = 0;
                $defaults['exerciseDescription'] = '';
                $defaults['exerciseFeedbackType'] = 0;
                $defaults['results_disabled'] = 0;
                $defaults['randomByCat'] = 0;
                $defaults['text_when_finished'] = '';
                $defaults['start_time'] = date('Y-m-d 12:00:00');
                $defaults['display_category_name'] = 1;
                $defaults['end_time'] = date('Y-m-d 12:00:00', time() + 84600);
                $defaults['pass_percentage'] = '';
                $defaults['end_button'] = $this->selectEndButton();
                $defaults['question_selection_type'] = 1;
                $defaults['hide_question_title'] = 0;
                $defaults['show_previous_button'] = 1;
                $defaults['on_success_message'] = null;
                $defaults['on_failed_message'] = null;
            }
        } else {
            $defaults['exerciseTitle'] = $this->selectTitle();
            $defaults['exerciseDescription'] = $this->selectDescription();
        }

        if (api_get_setting('search_enabled') === 'true') {
            $defaults['index_document'] = 'checked="checked"';
        }

        $this->setPageResultConfigurationDefaults($defaults);
        $form->setDefaults($defaults);

        // Freeze some elements.
        if ($this->id != 0 && $this->edit_exercise_in_lp == false) {
            $elementsToFreeze = [
                'randomQuestions',
                //'randomByCat',
                'exerciseAttempts',
                'propagate_neg',
                'enabletimercontrol',
                'review_answers',
            ];

            foreach ($elementsToFreeze as $elementName) {
                /** @var HTML_QuickForm_element $element */
                $element = $form->getElement($elementName);
                $element->freeze();
            }
        }
    }

    /**
     * @param $form
     */
    public function setResultFeedbackGroup(FormValidator $form)
    {
        // Feedback type.
        $feedback = [];
        $feedback[] = $form->createElement(
            'radio',
            'exerciseFeedbackType',
            null,
            get_lang('ExerciseAtTheEndOfTheTest'),
            EXERCISE_FEEDBACK_TYPE_END,
            [
                'id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_END,
                'onclick' => 'check_feedback()',
            ]
        );

        if (api_get_setting('enable_quiz_scenario') === 'true') {
            // Can't convert a question from one feedback to another
            // if there is more than 1 question already added
            if ($this->selectNbrQuestions() == 0) {
                $feedback[] = $form->createElement(
                    'radio',
                    'exerciseFeedbackType',
                    null,
                    get_lang('DirectFeedback'),
                    EXERCISE_FEEDBACK_TYPE_DIRECT,
                    [
                        'id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_DIRECT,
                        'onclick' => 'check_direct_feedback()',
                    ]
                );
            }
        }

        $feedback[] = $form->createElement(
            'radio',
            'exerciseFeedbackType',
            null,
            get_lang('ExerciseDirectPopUp'),
            EXERCISE_FEEDBACK_TYPE_POPUP,
            ['id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_POPUP, 'onclick' => 'check_direct_feedback()']
        );

        $feedback[] = $form->createElement(
            'radio',
            'exerciseFeedbackType',
            null,
            get_lang('NoFeedback'),
            EXERCISE_FEEDBACK_TYPE_EXAM,
            ['id' => 'exerciseType_'.EXERCISE_FEEDBACK_TYPE_EXAM]
        );

        $form->addGroup(
            $feedback,
            null,
            [
                get_lang('FeedbackType'),
                get_lang('FeedbackDisplayOptions'),
            ]
        );
    }

    /**
     * function which process the creation of exercises.
     *
     * @param FormValidator $form
     * @param string
     *
     * @return int c_quiz.iid
     */
    public function processCreation($form, $type = '')
    {
        $this->updateTitle(self::format_title_variable($form->getSubmitValue('exerciseTitle')));
        $this->updateDescription($form->getSubmitValue('exerciseDescription'));
        $this->updateAttempts($form->getSubmitValue('exerciseAttempts'));
        $this->updateFeedbackType($form->getSubmitValue('exerciseFeedbackType'));
        $this->updateType($form->getSubmitValue('exerciseType'));
        $this->setRandom($form->getSubmitValue('randomQuestions'));
        $this->updateRandomAnswers($form->getSubmitValue('randomAnswers'));
        $this->updateResultsDisabled($form->getSubmitValue('results_disabled'));
        $this->updateExpiredTime($form->getSubmitValue('enabletimercontroltotalminutes'));
        $this->updatePropagateNegative($form->getSubmitValue('propagate_neg'));
        $this->updateSaveCorrectAnswers($form->getSubmitValue('save_correct_answers'));
        $this->updateRandomByCat($form->getSubmitValue('randomByCat'));
        $this->updateTextWhenFinished($form->getSubmitValue('text_when_finished'));
        $this->updateDisplayCategoryName($form->getSubmitValue('display_category_name'));
        $this->updateReviewAnswers($form->getSubmitValue('review_answers'));
        $this->updatePassPercentage($form->getSubmitValue('pass_percentage'));
        $this->updateCategories($form->getSubmitValue('category'));
        $this->updateEndButton($form->getSubmitValue('end_button'));
        $this->setOnSuccessMessage($form->getSubmitValue('on_success_message'));
        $this->setOnFailedMessage($form->getSubmitValue('on_failed_message'));
        $this->updateEmailNotificationTemplate($form->getSubmitValue('email_notification_template'));
        $this->setEmailNotificationTemplateToUser($form->getSubmitValue('email_notification_template_to_user'));
        $this->setNotifyUserByEmail($form->getSubmitValue('notify_user_by_email'));
        $this->setModelType($form->getSubmitValue('model_type'));
        $this->setQuestionSelectionType($form->getSubmitValue('question_selection_type'));
        $this->setHideQuestionTitle($form->getSubmitValue('hide_question_title'));
        $this->sessionId = api_get_session_id();
        $this->setQuestionSelectionType($form->getSubmitValue('question_selection_type'));
        $this->setScoreTypeModel($form->getSubmitValue('score_type_model'));
        $this->setGlobalCategoryId($form->getSubmitValue('global_category_id'));
        $this->setShowPreviousButton($form->getSubmitValue('show_previous_button'));
        $this->setNotifications($form->getSubmitValue('notifications'));
        $this->setExerciseCategoryId($form->getSubmitValue('exercise_category_id'));
        $this->setPageResultConfiguration($form->getSubmitValues());

        $this->start_time = null;
        if ($form->getSubmitValue('activate_start_date_check') == 1) {
            $start_time = $form->getSubmitValue('start_time');
            $this->start_time = api_get_utc_datetime($start_time);
        }

        $this->end_time = null;
        if ($form->getSubmitValue('activate_end_date_check') == 1) {
            $end_time = $form->getSubmitValue('end_time');
            $this->end_time = api_get_utc_datetime($end_time);
        }

        $this->expired_time = 0;
        if ($form->getSubmitValue('enabletimercontrol') == 1) {
            $expired_total_time = $form->getSubmitValue('enabletimercontroltotalminutes');
            if ($this->expired_time == 0) {
                $this->expired_time = $expired_total_time;
            }
        }

        $this->random_answers = 0;
        if ($form->getSubmitValue('randomAnswers') == 1) {
            $this->random_answers = 1;
        }

        // Update title in all LPs that have this quiz added
        if ($form->getSubmitValue('update_title_in_lps') == 1) {
            $courseId = api_get_course_int_id();
            $table = Database::get_course_table(TABLE_LP_ITEM);
            $sql = "SELECT * FROM $table 
                    WHERE 
                        c_id = $courseId AND 
                        item_type = 'quiz' AND 
                        path = '".$this->id."'
                    ";
            $result = Database::query($sql);
            $items = Database::store_result($result);
            if (!empty($items)) {
                foreach ($items as $item) {
                    $itemId = $item['iid'];
                    $sql = "UPDATE $table SET title = '".$this->title."'                             
                            WHERE iid = $itemId AND c_id = $courseId ";
                    Database::query($sql);
                }
            }
        }

        $iId = $this->save($type);
        if (!empty($iId)) {
            $values = $form->getSubmitValues();
            $values['item_id'] = $iId;
            $extraFieldValue = new ExtraFieldValue('exercise');
            $extraFieldValue->saveFieldValues($values);

            Skill::saveSkills($form, ITEM_TYPE_EXERCISE, $iId);
        }
    }

    public function search_engine_save()
    {
        if ($_POST['index_document'] != 1) {
            return;
        }
        $course_id = api_get_course_id();

        require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';

        $specific_fields = get_specific_field_list();
        $ic_slide = new IndexableChunk();

        $all_specific_terms = '';
        foreach ($specific_fields as $specific_field) {
            if (isset($_REQUEST[$specific_field['code']])) {
                $sterms = trim($_REQUEST[$specific_field['code']]);
                if (!empty($sterms)) {
                    $all_specific_terms .= ' '.$sterms;
                    $sterms = explode(',', $sterms);
                    foreach ($sterms as $sterm) {
                        $ic_slide->addTerm(trim($sterm), $specific_field['code']);
                        add_specific_field_value($specific_field['id'], $course_id, TOOL_QUIZ, $this->id, $sterm);
                    }
                }
            }
        }

        // build the chunk to index
        $ic_slide->addValue("title", $this->exercise);
        $ic_slide->addCourseId($course_id);
        $ic_slide->addToolId(TOOL_QUIZ);
        $xapian_data = [
            SE_COURSE_ID => $course_id,
            SE_TOOL_ID => TOOL_QUIZ,
            SE_DATA => ['type' => SE_DOCTYPE_EXERCISE_EXERCISE, 'exercise_id' => (int) $this->id],
            SE_USER => (int) api_get_user_id(),
        ];
        $ic_slide->xapian_data = serialize($xapian_data);
        $exercise_description = $all_specific_terms.' '.$this->description;
        $ic_slide->addValue("content", $exercise_description);

        $di = new ChamiloIndexer();
        isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
        $di->connectDb(null, null, $lang);
        $di->addChunk($ic_slide);

        //index and return search engine document id
        $did = $di->index();
        if ($did) {
            // save it to db
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, search_did)
			    VALUES (NULL , \'%s\', \'%s\', %s, %s)';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id, $did);
            Database::query($sql);
        }
    }

    public function search_engine_edit()
    {
        // update search enchine and its values table if enabled
        if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
            $course_id = api_get_course_id();

            // actually, it consists on delete terms from db,
            // insert new ones, create a new search engine document, and remove the old one
            // get search_did
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
            $res = Database::query($sql);

            if (Database::num_rows($res) > 0) {
                require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';

                $se_ref = Database::fetch_array($res);
                $specific_fields = get_specific_field_list();
                $ic_slide = new IndexableChunk();

                $all_specific_terms = '';
                foreach ($specific_fields as $specific_field) {
                    delete_all_specific_field_value($course_id, $specific_field['id'], TOOL_QUIZ, $this->id);
                    if (isset($_REQUEST[$specific_field['code']])) {
                        $sterms = trim($_REQUEST[$specific_field['code']]);
                        $all_specific_terms .= ' '.$sterms;
                        $sterms = explode(',', $sterms);
                        foreach ($sterms as $sterm) {
                            $ic_slide->addTerm(trim($sterm), $specific_field['code']);
                            add_specific_field_value($specific_field['id'], $course_id, TOOL_QUIZ, $this->id, $sterm);
                        }
                    }
                }

                // build the chunk to index
                $ic_slide->addValue('title', $this->exercise);
                $ic_slide->addCourseId($course_id);
                $ic_slide->addToolId(TOOL_QUIZ);
                $xapian_data = [
                    SE_COURSE_ID => $course_id,
                    SE_TOOL_ID => TOOL_QUIZ,
                    SE_DATA => ['type' => SE_DOCTYPE_EXERCISE_EXERCISE, 'exercise_id' => (int) $this->id],
                    SE_USER => (int) api_get_user_id(),
                ];
                $ic_slide->xapian_data = serialize($xapian_data);
                $exercise_description = $all_specific_terms.' '.$this->description;
                $ic_slide->addValue("content", $exercise_description);

                $di = new ChamiloIndexer();
                isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
                $di->connectDb(null, null, $lang);
                $di->remove_document($se_ref['search_did']);
                $di->addChunk($ic_slide);

                //index and return search engine document id
                $did = $di->index();
                if ($did) {
                    // save it to db
                    $sql = 'DELETE FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=\'%s\'';
                    $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
                    Database::query($sql);
                    $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, search_did)
                        VALUES (NULL , \'%s\', \'%s\', %s, %s)';
                    $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id, $did);
                    Database::query($sql);
                }
            } else {
                $this->search_engine_save();
            }
        }
    }

    public function search_engine_delete()
    {
        // remove from search engine if enabled
        if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
            $course_id = api_get_course_id();
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            $sql = 'SELECT * FROM %s
                    WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level IS NULL 
                    LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
            $res = Database::query($sql);
            if (Database::num_rows($res) > 0) {
                $row = Database::fetch_array($res);
                $di = new ChamiloIndexer();
                $di->remove_document($row['search_did']);
                unset($di);
                $tbl_quiz_question = Database::get_course_table(TABLE_QUIZ_QUESTION);
                foreach ($this->questionList as $question_i) {
                    $sql = 'SELECT type FROM %s WHERE id=%s';
                    $sql = sprintf($sql, $tbl_quiz_question, $question_i);
                    $qres = Database::query($sql);
                    if (Database::num_rows($qres) > 0) {
                        $qrow = Database::fetch_array($qres);
                        $objQuestion = Question::getInstance($qrow['type']);
                        $objQuestion = Question::read((int) $question_i);
                        $objQuestion->search_engine_edit($this->id, false, true);
                        unset($objQuestion);
                    }
                }
            }
            $sql = 'DELETE FROM %s 
                    WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level IS NULL 
                    LIMIT 1';
            $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
            Database::query($sql);

            // remove terms from db
            require_once api_get_path(LIBRARY_PATH).'specific_fields_manager.lib.php';
            delete_all_values_for_item($course_id, TOOL_QUIZ, $this->id);
        }
    }

    public function selectExpiredTime()
    {
        return $this->expired_time;
    }

    /**
     * Cleans the student's results only for the Exercise tool (Not from the LP)
     * The LP results are NOT deleted by default, otherwise put $cleanLpTests = true
     * Works with exercises in sessions.
     *
     * @param bool   $cleanLpTests
     * @param string $cleanResultBeforeDate
     *
     * @return int quantity of user's exercises deleted
     */
    public function cleanResults($cleanLpTests = false, $cleanResultBeforeDate = null)
    {
        $sessionId = api_get_session_id();
        $table_track_e_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $table_track_e_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

        $sql_where = '  AND
                        orig_lp_id = 0 AND
                        orig_lp_item_id = 0';

        // if we want to delete results from LP too
        if ($cleanLpTests) {
            $sql_where = '';
        }

        // if we want to delete attempts before date $cleanResultBeforeDate
        // $cleanResultBeforeDate must be a valid UTC-0 date yyyy-mm-dd

        if (!empty($cleanResultBeforeDate)) {
            $cleanResultBeforeDate = Database::escape_string($cleanResultBeforeDate);
            if (api_is_valid_date($cleanResultBeforeDate)) {
                $sql_where .= "  AND exe_date <= '$cleanResultBeforeDate' ";
            } else {
                return 0;
            }
        }

        $sql = "SELECT exe_id
            FROM $table_track_e_exercises
            WHERE
                c_id = ".api_get_course_int_id()." AND
                exe_exo_id = ".$this->id." AND
                session_id = ".$sessionId." ".
                $sql_where;

        $result = Database::query($sql);
        $exe_list = Database::store_result($result);

        // deleting TRACK_E_ATTEMPT table
        // check if exe in learning path or not
        $i = 0;
        if (is_array($exe_list) && count($exe_list) > 0) {
            foreach ($exe_list as $item) {
                $sql = "DELETE FROM $table_track_e_attempt
                        WHERE exe_id = '".$item['exe_id']."'";
                Database::query($sql);
                $i++;
            }
        }

        // delete TRACK_E_EXERCISES table
        $sql = "DELETE FROM $table_track_e_exercises
                WHERE 
                  c_id = ".api_get_course_int_id()." AND 
                  exe_exo_id = ".$this->id." $sql_where AND 
                  session_id = ".$sessionId;
        Database::query($sql);

        $this->generateStats($this->id, api_get_course_info(), $sessionId);

        Event::addEvent(
            LOG_EXERCISE_RESULT_DELETE,
            LOG_EXERCISE_ID,
            $this->id,
            null,
            null,
            api_get_course_int_id(),
            $sessionId
        );

        return $i;
    }

    /**
     * Copies an exercise (duplicate all questions and answers).
     */
    public function copyExercise()
    {
        $exerciseObject = $this;
        $categories = $exerciseObject->getCategoriesInExercise();
        // Get all questions no matter the order/category settings
        $questionList = $exerciseObject->getQuestionOrderedList();
        // Force the creation of a new exercise
        $exerciseObject->updateTitle($exerciseObject->selectTitle().' - '.get_lang('Copy'));
        // Hides the new exercise
        $exerciseObject->updateStatus(false);
        $exerciseObject->updateId(0);
        $exerciseObject->save();
        $newId = $exerciseObject->selectId();
        if ($newId && !empty($questionList)) {
            // Question creation
            foreach ($questionList as $oldQuestionId) {
                $oldQuestionObj = Question::read($oldQuestionId);
                $newQuestionId = $oldQuestionObj->duplicate();
                if ($newQuestionId) {
                    $newQuestionObj = Question::read($newQuestionId);
                    if (isset($newQuestionObj) && $newQuestionObj) {
                        $newQuestionObj->addToList($newId);
                        if (!empty($oldQuestionObj->category)) {
                            $newQuestionObj->saveCategory($oldQuestionObj->category);
                        }

                        // This should be moved to the duplicate function
                        $newAnswerObj = new Answer($oldQuestionId);
                        $newAnswerObj->read();
                        $newAnswerObj->duplicate($newQuestionObj);
                    }
                }
            }
            if (!empty($categories)) {
                $newCategoryList = [];
                foreach ($categories as $category) {
                    $newCategoryList[$category['category_id']] = $category['count_questions'];
                }
                $exerciseObject->save_categories_in_exercise($newCategoryList);
            }
        }
    }

    /**
     * Changes the exercise status.
     *
     * @param string $status - exercise status
     */
    public function updateStatus($status)
    {
        $this->active = $status;
    }

    /**
     * @param int    $lp_id
     * @param int    $lp_item_id
     * @param int    $lp_item_view_id
     * @param string $status
     *
     * @return array
     */
    public function get_stat_track_exercise_info(
        $lp_id = 0,
        $lp_item_id = 0,
        $lp_item_view_id = 0,
        $status = 'incomplete'
    ) {
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        if (empty($lp_id)) {
            $lp_id = 0;
        }
        if (empty($lp_item_id)) {
            $lp_item_id = 0;
        }
        if (empty($lp_item_view_id)) {
            $lp_item_view_id = 0;
        }
        $condition = ' WHERE exe_exo_id 	= '."'".$this->id."'".' AND
					   exe_user_id 			= '."'".api_get_user_id()."'".' AND
					   c_id                 = '.api_get_course_int_id().' AND
					   status 				= '."'".Database::escape_string($status)."'".' AND
					   orig_lp_id 			= '."'".$lp_id."'".' AND
					   orig_lp_item_id 		= '."'".$lp_item_id."'".' AND
                       orig_lp_item_view_id = '."'".$lp_item_view_id."'".' AND
					   session_id 			= '."'".api_get_session_id()."' LIMIT 1"; //Adding limit 1 just in case

        $sql_track = 'SELECT * FROM '.$track_exercises.$condition;

        $result = Database::query($sql_track);
        $new_array = [];
        if (Database::num_rows($result) > 0) {
            $new_array = Database::fetch_array($result, 'ASSOC');
            $new_array['num_exe'] = Database::num_rows($result);
        }

        return $new_array;
    }

    /**
     * Saves a test attempt.
     *
     * @param int $clock_expired_time clock_expired_time
     * @param int  int lp id
     * @param int  int lp item id
     * @param int  int lp item_view id
     * @param array $questionList
     * @param float $weight
     *
     * @return int
     */
    public function save_stat_track_exercise_info(
        $clock_expired_time = 0,
        $safe_lp_id = 0,
        $safe_lp_item_id = 0,
        $safe_lp_item_view_id = 0,
        $questionList = [],
        $weight = 0
    ) {
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $safe_lp_id = intval($safe_lp_id);
        $safe_lp_item_id = intval($safe_lp_item_id);
        $safe_lp_item_view_id = intval($safe_lp_item_view_id);

        if (empty($safe_lp_id)) {
            $safe_lp_id = 0;
        }
        if (empty($safe_lp_item_id)) {
            $safe_lp_item_id = 0;
        }
        if (empty($clock_expired_time)) {
            $clock_expired_time = null;
        }

        $questionList = array_map('intval', $questionList);

        $params = [
            'exe_exo_id' => $this->id,
            'exe_user_id' => api_get_user_id(),
            'c_id' => api_get_course_int_id(),
            'status' => 'incomplete',
            'session_id' => api_get_session_id(),
            'data_tracking' => implode(',', $questionList),
            'start_date' => api_get_utc_datetime(),
            'orig_lp_id' => $safe_lp_id,
            'orig_lp_item_id' => $safe_lp_item_id,
            'orig_lp_item_view_id' => $safe_lp_item_view_id,
            'exe_weighting' => $weight,
            'user_ip' => Database::escape_string(api_get_real_ip()),
            'exe_date' => api_get_utc_datetime(),
            'exe_result' => 0,
            'steps_counter' => 0,
            'exe_duration' => 0,
            'expired_time_control' => $clock_expired_time,
            'questions_to_check' => '',
        ];

        $id = Database::insert($track_exercises, $params);

        return $id;
    }

    /**
     * @param int    $question_id
     * @param int    $questionNum
     * @param array  $questions_in_media
     * @param string $currentAnswer
     * @param array  $myRemindList
     *
     * @return string
     */
    public function show_button(
        $question_id,
        $questionNum,
        $questions_in_media = [],
        $currentAnswer = '',
        $myRemindList = []
    ) {
        global $origin, $safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id;
        $nbrQuestions = $this->getQuestionCount();
        $buttonList = [];
        $html = $label = '';
        $hotspot_get = isset($_POST['hotspot']) ? Security::remove_XSS($_POST['hotspot']) : null;

        if (in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP]) &&
            $this->type == ONE_PER_PAGE
        ) {
            $urlTitle = get_lang('ContinueTest');
            if ($questionNum == count($this->questionList)) {
                $urlTitle = get_lang('EndTest');
            }

            $html .= Display::url(
                $urlTitle,
                api_get_path(WEB_CODE_PATH).'exercise/exercise_submit_modal.php?'.http_build_query([
                    'learnpath_id' => $safe_lp_id,
                    'learnpath_item_id' => $safe_lp_item_id,
                    'learnpath_item_view_id' => $safe_lp_item_view_id,
                    'origin' => $origin,
                    'hotspot' => $hotspot_get,
                    'nbrQuestions' => $nbrQuestions,
                    'num' => $questionNum,
                    'exerciseType' => $this->type,
                    'exerciseId' => $this->id,
                    'reminder' => empty($myRemindList) ? null : 2,
                ]),
                [
                    'class' => 'ajax btn btn-default',
                    'data-title' => Security::remove_XSS(get_lang('Comment')),
                    'data-size' => 'md',
                ]
            );
            $html .= '<br />';
        } else {
            // User
            if (api_is_allowed_to_session_edit()) {
                $endReminderValue = false;
                if (!empty($myRemindList)) {
                    $endValue = end($myRemindList);
                    if ($endValue == $question_id) {
                        $endReminderValue = true;
                    }
                }
                if ($this->type == ALL_ON_ONE_PAGE || $nbrQuestions == $questionNum || $endReminderValue) {
                    if ($this->review_answers) {
                        $label = get_lang('ReviewQuestions');
                        $class = 'btn btn-success';
                    } else {
                        $label = get_lang('EndTest');
                        $class = 'btn btn-warning';
                    }
                } else {
                    $label = get_lang('NextQuestion');
                    $class = 'btn btn-primary';
                }
                // used to select it with jquery
                $class .= ' question-validate-btn';
                if ($this->type == ONE_PER_PAGE) {
                    if ($questionNum != 1) {
                        if ($this->showPreviousButton()) {
                            $prev_question = $questionNum - 2;
                            $showPreview = true;
                            if (!empty($myRemindList)) {
                                $beforeId = null;
                                for ($i = 0; $i < count($myRemindList); $i++) {
                                    if (isset($myRemindList[$i]) && $myRemindList[$i] == $question_id) {
                                        $beforeId = isset($myRemindList[$i - 1]) ? $myRemindList[$i - 1] : null;
                                        break;
                                    }
                                }

                                if (empty($beforeId)) {
                                    $showPreview = false;
                                } else {
                                    $num = 0;
                                    foreach ($this->questionList as $originalQuestionId) {
                                        if ($originalQuestionId == $beforeId) {
                                            break;
                                        }
                                        $num++;
                                    }
                                    $prev_question = $num;
                                }
                            }

                            if ($showPreview) {
                                $buttonList[] = Display::button(
                                    'previous_question_and_save',
                                    get_lang('PreviousQuestion'),
                                    [
                                        'type' => 'button',
                                        'class' => 'btn btn-default',
                                        'data-prev' => $prev_question,
                                        'data-question' => $question_id,
                                    ]
                                );
                            }
                        }
                    }

                    // Next question
                    if (!empty($questions_in_media)) {
                        $buttonList[] = Display::button(
                            'save_question_list',
                            $label,
                            [
                                'type' => 'button',
                                'class' => $class,
                                'data-list' => implode(",", $questions_in_media),
                            ]
                        );
                    } else {
                        $buttonList[] = Display::button(
                            'save_now',
                            $label,
                            ['type' => 'button', 'class' => $class, 'data-question' => $question_id]
                        );
                    }
                    $buttonList[] = '<span id="save_for_now_'.$question_id.'" class="exercise_save_mini_message"></span>&nbsp;';

                    $html .= implode(PHP_EOL, $buttonList);
                } else {
                    if ($this->review_answers) {
                        $all_label = get_lang('ReviewQuestions');
                        $class = 'btn btn-success';
                    } else {
                        $all_label = get_lang('EndTest');
                        $class = 'btn btn-warning';
                    }
                    // used to select it with jquery
                    $class .= ' question-validate-btn';
                    $buttonList[] = Display::button(
                        'validate_all',
                        $all_label,
                        ['type' => 'button', 'class' => $class]
                    );
                    $buttonList[] = '&nbsp;'.Display::span(null, ['id' => 'save_all_response']);
                    $html .= implode(PHP_EOL, $buttonList);
                }
            }
        }

        return $html;
    }

    /**
     * @param int    $timeLeft in seconds
     * @param string $url
     *
     * @return string
     */
    public function showSimpleTimeControl($timeLeft, $url = '')
    {
        $timeLeft = (int) $timeLeft;

        return "<script>
            function openClockWarning() {
                $('#clock_warning').dialog({
                    modal:true,
                    height:320,
                    width:550,
                    closeOnEscape: false,
                    resizable: false,
                    buttons: {
                        '".addslashes(get_lang('Close'))."': function() {
                            $('#clock_warning').dialog('close');
                        }
                    },
                    close: function() {
                        window.location.href = '$url';
                    }
                });                
                $('#clock_warning').dialog('open');
                $('#counter_to_redirect').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: 5},
                    format: 's'
                }).bind('timer', function () {                    
                    window.location.href = '$url';                    
                });
            }        

            function onExpiredTimeExercise() {
                $('#wrapper-clock').hide();
                $('#expired-message-id').show();
                // Fixes bug #5263
                $('#num_current_id').attr('value', '".$this->selectNbrQuestions()."');
                openClockWarning();
            }

			$(function() {
				// time in seconds when using minutes there are some seconds lost
                var time_left = parseInt(".$timeLeft.");
                $('#exercise_clock_warning').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: time_left},
                    format: 'x:i:s',
                    renderer: 'minute'
                }).bind('timer', function () {                    
                    onExpiredTimeExercise();
                });
	       		$('#submit_save').click(function () {});
	        });
	    </script>";
    }

    /**
     * So the time control will work.
     *
     * @param int $timeLeft
     *
     * @return string
     */
    public function showTimeControlJS($timeLeft)
    {
        $timeLeft = (int) $timeLeft;
        $script = 'redirectExerciseToResult();';
        if ($this->type == ALL_ON_ONE_PAGE) {
            $script = "save_now_all('validate');";
        }

        return "<script>
            function openClockWarning() {
                $('#clock_warning').dialog({
                    modal:true,
                    height:320,
                    width:550,
                    closeOnEscape: false,
                    resizable: false,
                    buttons: {
                        '".addslashes(get_lang('EndTest'))."': function() {
                            $('#clock_warning').dialog('close');
                        }
                    },
                    close: function() {
                        send_form();
                    }
                });
                
                $('#clock_warning').dialog('open');
                $('#counter_to_redirect').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: 5},
                    format: 's'
                }).bind('timer', function () {
                    send_form();
                });
            }

            function send_form() {
                if ($('#exercise_form').length) {
                    $script
                } else {
                    // In exercise_reminder.php
                    final_submit();
                }
            }

            function onExpiredTimeExercise() {
                $('#wrapper-clock').hide();
                $('#expired-message-id').show();
                // Fixes bug #5263
                $('#num_current_id').attr('value', '".$this->selectNbrQuestions()."');
                openClockWarning();
            }

			$(function() {
				// time in seconds when using minutes there are some seconds lost
                var time_left = parseInt(".$timeLeft.");
                $('#exercise_clock_warning').epiclock({
                    mode: $.epiclock.modes.countdown,
                    offset: {seconds: time_left},
                    format: 'x:i:s',
                    renderer: 'minute'
                }).bind('timer', function () {
                    onExpiredTimeExercise();
                });
	       		$('#submit_save').click(function () {});
	        });
	    </script>";
    }

    /**
     * This function was originally found in the exercise_show.php.
     *
     * @param int    $exeId
     * @param int    $questionId
     * @param mixed  $choice                                    the user-selected option
     * @param string $from                                      function is called from 'exercise_show' or
     *                                                          'exercise_result'
     * @param array  $exerciseResultCoordinates                 the hotspot coordinates $hotspot[$question_id] =
     *                                                          coordinates
     * @param bool   $saved_results                             save results in the DB or just show the reponse
     * @param bool   $from_database                             gets information from DB or from the current selection
     * @param bool   $show_result                               show results or not
     * @param int    $propagate_neg
     * @param array  $hotspot_delineation_result
     * @param bool   $showTotalScoreAndUserChoicesInLastAttempt
     * @param bool   $updateResults
     *
     * @todo    reduce parameters of this function
     *
     * @return string html code
     */
    public function manage_answer(
        $exeId,
        $questionId,
        $choice,
        $from = 'exercise_show',
        $exerciseResultCoordinates = [],
        $saved_results = true,
        $from_database = false,
        $show_result = true,
        $propagate_neg = 0,
        $hotspot_delineation_result = [],
        $showTotalScoreAndUserChoicesInLastAttempt = true,
        $updateResults = false
    ) {
        $debug = false;
        //needed in order to use in the exercise_attempt() for the time
        global $learnpath_id, $learnpath_item_id;
        require_once api_get_path(LIBRARY_PATH).'geometry.lib.php';
        $em = Database::getManager();
        $feedback_type = $this->getFeedbackType();
        $results_disabled = $this->selectResultsDisabled();

        if ($debug) {
            error_log("<------ manage_answer ------> ");
            error_log('exe_id: '.$exeId);
            error_log('$from:  '.$from);
            error_log('$saved_results: '.intval($saved_results));
            error_log('$from_database: '.intval($from_database));
            error_log('$show_result: '.intval($show_result));
            error_log('$propagate_neg: '.$propagate_neg);
            error_log('$exerciseResultCoordinates: '.print_r($exerciseResultCoordinates, 1));
            error_log('$hotspot_delineation_result: '.print_r($hotspot_delineation_result, 1));
            error_log('$learnpath_id: '.$learnpath_id);
            error_log('$learnpath_item_id: '.$learnpath_item_id);
            error_log('$choice: '.print_r($choice, 1));
        }

        $final_overlap = 0;
        $final_missing = 0;
        $final_excess = 0;
        $overlap_color = 0;
        $missing_color = 0;
        $excess_color = 0;
        $threadhold1 = 0;
        $threadhold2 = 0;
        $threadhold3 = 0;
        $arrques = null;
        $arrans = null;
        $studentChoice = null;
        $expectedAnswer = '';
        $calculatedChoice = '';
        $calculatedStatus = '';
        $questionId = (int) $questionId;
        $exeId = (int) $exeId;
        $TBL_TRACK_ATTEMPT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
        $table_ans = Database::get_course_table(TABLE_QUIZ_ANSWER);

        // Creates a temporary Question object
        $course_id = $this->course_id;
        $objQuestionTmp = Question::read($questionId, $this->course);

        if ($objQuestionTmp === false) {
            return false;
        }

        $questionName = $objQuestionTmp->selectTitle();
        $questionWeighting = $objQuestionTmp->selectWeighting();
        $answerType = $objQuestionTmp->selectType();
        $quesId = $objQuestionTmp->selectId();
        $extra = $objQuestionTmp->extra;
        $next = 1; //not for now
        $totalWeighting = 0;
        $totalScore = 0;

        // Extra information of the question
        if ((
            $answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
            $answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY
            )
            && !empty($extra)
        ) {
            $extra = explode(':', $extra);
            if ($debug) {
                error_log(print_r($extra, 1));
            }
            // Fixes problems with negatives values using intval

            $true_score = floatval(trim($extra[0]));
            $false_score = floatval(trim($extra[1]));
            $doubt_score = floatval(trim($extra[2]));
        }

        // Construction of the Answer object
        $objAnswerTmp = new Answer($questionId, $course_id);
        $nbrAnswers = $objAnswerTmp->selectNbrAnswers();

        if ($debug) {
            error_log('Count of answers: '.$nbrAnswers);
            error_log('$answerType: '.$answerType);
        }

        if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
            $choiceTmp = $choice;
            $choice = isset($choiceTmp['choice']) ? $choiceTmp['choice'] : '';
            $choiceDegreeCertainty = isset($choiceTmp['choiceDegreeCertainty']) ? $choiceTmp['choiceDegreeCertainty'] : '';
        }

        if ($answerType == FREE_ANSWER ||
            $answerType == ORAL_EXPRESSION ||
            $answerType == CALCULATED_ANSWER ||
            $answerType == ANNOTATION
        ) {
            $nbrAnswers = 1;
        }

        $generatedFile = '';
        if ($answerType == ORAL_EXPRESSION) {
            $exe_info = Event::get_exercise_results_by_attempt($exeId);
            $exe_info = isset($exe_info[$exeId]) ? $exe_info[$exeId] : null;

            $objQuestionTmp->initFile(
                api_get_session_id(),
                isset($exe_info['exe_user_id']) ? $exe_info['exe_user_id'] : api_get_user_id(),
                isset($exe_info['exe_exo_id']) ? $exe_info['exe_exo_id'] : $this->id,
                isset($exe_info['exe_id']) ? $exe_info['exe_id'] : $exeId
            );

            // Probably this attempt came in an exercise all question by page
            if ($feedback_type == 0) {
                $objQuestionTmp->replaceWithRealExe($exeId);
            }
            $generatedFile = $objQuestionTmp->getFileUrl();
        }

        $user_answer = '';
        // Get answer list for matching
        $sql = "SELECT id_auto, id, answer
                FROM $table_ans
                WHERE c_id = $course_id AND question_id = $questionId";
        $res_answer = Database::query($sql);

        $answerMatching = [];
        while ($real_answer = Database::fetch_array($res_answer)) {
            $answerMatching[$real_answer['id_auto']] = $real_answer['answer'];
        }

        $real_answers = [];
        $quiz_question_options = Question::readQuestionOption(
            $questionId,
            $course_id
        );

        $organs_at_risk_hit = 0;
        $questionScore = 0;
        $answer_correct_array = [];
        $orderedHotspots = [];

        if ($answerType == HOT_SPOT || $answerType == ANNOTATION) {
            $orderedHotspots = $em->getRepository('ChamiloCoreBundle:TrackEHotspot')->findBy(
                [
                    'hotspotQuestionId' => $questionId,
                    'cId' => $course_id,
                    'hotspotExeId' => $exeId,
                ],
                ['hotspotAnswerId' => 'ASC']
            );
        }
        if ($debug) {
            error_log('Start answer loop ');
        }

        $userAnsweredQuestion = false;
        for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
            $answer = $objAnswerTmp->selectAnswer($answerId);
            $answerComment = $objAnswerTmp->selectComment($answerId);
            $answerCorrect = $objAnswerTmp->isCorrect($answerId);
            $answerWeighting = (float) $objAnswerTmp->selectWeighting($answerId);
            $answerAutoId = $objAnswerTmp->selectAutoId($answerId);
            $answerIid = isset($objAnswerTmp->iid[$answerId]) ? $objAnswerTmp->iid[$answerId] : '';
            $answer_correct_array[$answerId] = (bool) $answerCorrect;

            if ($debug) {
                error_log("answer auto id: $answerAutoId ");
                error_log("answer correct: $answerCorrect ");
            }

            // Delineation
            $delineation_cord = $objAnswerTmp->selectHotspotCoordinates(1);
            $answer_delineation_destination = $objAnswerTmp->selectDestination(1);

            switch ($answerType) {
                case UNIQUE_ANSWER:
                case UNIQUE_ANSWER_IMAGE:
                case UNIQUE_ANSWER_NO_OPTION:
                case READING_COMPREHENSION:
                    if ($from_database) {
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id = $questionId";
                        $result = Database::query($sql);
                        $choice = Database::result($result, 0, 'answer');

                        if ($userAnsweredQuestion === false) {
                            $userAnsweredQuestion = !empty($choice);
                        }
                        $studentChoice = $choice == $answerAutoId ? 1 : 0;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                            $totalScore += $answerWeighting;
                        }
                    } else {
                        $studentChoice = $choice == $answerAutoId ? 1 : 0;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                            $totalScore += $answerWeighting;
                        }
                    }
                    break;
                case MULTIPLE_ANSWER_TRUE_FALSE:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id = ".$questionId;

                        $result = Database::query($sql);
                        while ($row = Database::fetch_array($result)) {
                            $values = explode(':', $row['answer']);
                            $my_answer_id = isset($values[0]) ? $values[0] : '';
                            $option = isset($values[1]) ? $values[1] : '';
                            $choice[$my_answer_id] = $option;
                        }
                    }

                    $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                    if (!empty($studentChoice)) {
                        if ($studentChoice == $answerCorrect) {
                            $questionScore += $true_score;
                        } else {
                            if ($quiz_question_options[$studentChoice]['name'] == "Don't know" ||
                                $quiz_question_options[$studentChoice]['name'] == "DoubtScore"
                            ) {
                                $questionScore += $doubt_score;
                            } else {
                                $questionScore += $false_score;
                            }
                        }
                    } else {
                        // If no result then the user just hit don't know
                        $studentChoice = 3;
                        $questionScore += $doubt_score;
                    }
                    $totalScore = $questionScore;
                    break;
                case MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY:
                    if ($from_database) {
                        $choice = [];
                        $choiceDegreeCertainty = [];
                        $sql = "SELECT answer 
                            FROM $TBL_TRACK_ATTEMPT
                            WHERE 
                            exe_id = $exeId AND question_id = $questionId";

                        $result = Database::query($sql);
                        while ($row = Database::fetch_array($result)) {
                            $ind = $row['answer'];
                            $values = explode(':', $ind);
                            $myAnswerId = $values[0];
                            $option = $values[1];
                            $percent = $values[2];
                            $choice[$myAnswerId] = $option;
                            $choiceDegreeCertainty[$myAnswerId] = $percent;
                        }
                    }

                    $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                    $studentChoiceDegree = isset($choiceDegreeCertainty[$answerAutoId]) ?
                        $choiceDegreeCertainty[$answerAutoId] : null;

                    // student score update
                    if (!empty($studentChoice)) {
                        if ($studentChoice == $answerCorrect) {
                            // correct answer and student is Unsure or PrettySur
                            if (isset($quiz_question_options[$studentChoiceDegree]) &&
                                $quiz_question_options[$studentChoiceDegree]['position'] >= 3 &&
                                $quiz_question_options[$studentChoiceDegree]['position'] < 9
                            ) {
                                $questionScore += $true_score;
                            } else {
                                // student ignore correct answer
                                $questionScore += $doubt_score;
                            }
                        } else {
                            // false answer and student is Unsure or PrettySur
                            if ($quiz_question_options[$studentChoiceDegree]['position'] >= 3
                                && $quiz_question_options[$studentChoiceDegree]['position'] < 9) {
                                $questionScore += $false_score;
                            } else {
                                // student ignore correct answer
                                $questionScore += $doubt_score;
                            }
                        }
                    }
                    $totalScore = $questionScore;
                    break;
                case MULTIPLE_ANSWER: //2
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM ".$TBL_TRACK_ATTEMPT."
                                WHERE exe_id = '".$exeId."' AND question_id= '".$questionId."'";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }

                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        $real_answers[$answerId] = (bool) $studentChoice;

                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                        }
                    } else {
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        $real_answers[$answerId] = (bool) $studentChoice;

                        if (isset($studentChoice)) {
                            $questionScore += $answerWeighting;
                        }
                    }
                    $totalScore += $answerWeighting;

                    if ($debug) {
                        error_log("studentChoice: $studentChoice");
                    }
                    break;
                case GLOBAL_MULTIPLE_ANSWER:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = '".$exeId."' AND question_id= '".$questionId."'";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        $real_answers[$answerId] = (bool) $studentChoice;
                        if ($studentChoice) {
                            $questionScore += $answerWeighting;
                        }
                    } else {
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        if (isset($studentChoice)) {
                            $questionScore += $answerWeighting;
                        }
                        $real_answers[$answerId] = (bool) $studentChoice;
                    }
                    $totalScore += $answerWeighting;
                    if ($debug) {
                        error_log("studentChoice: $studentChoice");
                    }
                    break;
                case MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM ".$TBL_TRACK_ATTEMPT."
                                WHERE exe_id = $exeId AND question_id= ".$questionId;
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $result = explode(':', $row['answer']);
                            if (isset($result[0])) {
                                $my_answer_id = isset($result[0]) ? $result[0] : '';
                                $option = isset($result[1]) ? $result[1] : '';
                                $choice[$my_answer_id] = $option;
                            }
                        }
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : '';

                        $real_answers[$answerId] = false;
                        if ($answerCorrect == $studentChoice) {
                            $real_answers[$answerId] = true;
                        }
                    } else {
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : '';
                        $real_answers[$answerId] = false;
                        if ($answerCorrect == $studentChoice) {
                            $real_answers[$answerId] = true;
                        }
                    }
                    break;
                case MULTIPLE_ANSWER_COMBINATION:
                    if ($from_database) {
                        $choice = [];
                        $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                WHERE exe_id = $exeId AND question_id = $questionId";
                        $resultans = Database::query($sql);
                        while ($row = Database::fetch_array($resultans)) {
                            $choice[$row['answer']] = 1;
                        }

                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        if ($answerCorrect == 1) {
                            $real_answers[$answerId] = false;
                            if ($studentChoice) {
                                $real_answers[$answerId] = true;
                            }
                        } else {
                            $real_answers[$answerId] = true;
                            if ($studentChoice) {
                                $real_answers[$answerId] = false;
                            }
                        }
                    } else {
                        $studentChoice = isset($choice[$answerAutoId]) ? $choice[$answerAutoId] : null;
                        if ($answerCorrect == 1) {
                            $real_answers[$answerId] = false;
                            if ($studentChoice) {
                                $real_answers[$answerId] = true;
                            }
                        } else {
                            $real_answers[$answerId] = true;
                            if ($studentChoice) {
                                $real_answers[$answerId] = false;
                            }
                        }
                    }
                    break;
                case FILL_IN_BLANKS:
                    $str = '';
                    $answerFromDatabase = '';
                    if ($from_database) {
                        $sql = "SELECT answer
                                FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id= ".intval($questionId);
                        $result = Database::query($sql);
                        if ($debug) {
                            error_log($sql);
                        }
                        $str = $answerFromDatabase = Database::result($result, 0, 'answer');
                    }
                    //ofaj
                    if ($saved_results == false && strpos($answerFromDatabase, 'font color') !== false) {
                        // the question is encoded like this
                        // [A] B [C] D [E] F::10,10,10@1
                        // number 1 before the "@" means that is a switchable fill in blank question
                        // [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
                        // means that is a normal fill blank question
                        // first we explode the "::"
                        $pre_array = explode('::', $answer);

                        // is switchable fill blank or not
                        $last = count($pre_array) - 1;
                        $is_set_switchable = explode('@', $pre_array[$last]);
                        $switchable_answer_set = false;
                        if (isset($is_set_switchable[1]) && $is_set_switchable[1] == 1) {
                            $switchable_answer_set = true;
                        }
                        $answer = '';
                        for ($k = 0; $k < $last; $k++) {
                            $answer .= $pre_array[$k];
                        }
                        // splits weightings that are joined with a comma
                        $answerWeighting = explode(',', $is_set_switchable[0]);
                        // we save the answer because it will be modified
                        $temp = $answer;
                        $answer = '';
                        $j = 0;
                        //initialise answer tags
                        $user_tags = $correct_tags = $real_text = [];
                        // the loop will stop at the end of the text
                        while (1) {
                            // quits the loop if there are no more blanks (detect '[')
                            if ($temp == false || ($pos = api_strpos($temp, '[')) === false) {
                                // adds the end of the text
                                $answer = $temp;
                                $real_text[] = $answer;
                                break; //no more "blanks", quit the loop
                            }
                            // adds the piece of text that is before the blank
                            //and ends with '[' into a general storage array
                            $real_text[] = api_substr($temp, 0, $pos + 1);
                            $answer .= api_substr($temp, 0, $pos + 1);
                            //take the string remaining (after the last "[" we found)
                            $temp = api_substr($temp, $pos + 1);
                            // quit the loop if there are no more blanks, and update $pos to the position of next ']'
                            if (($pos = api_strpos($temp, ']')) === false) {
                                // adds the end of the text
                                $answer .= $temp;
                                break;
                            }
                            if ($from_database) {
                                $str = $answerFromDatabase;
                                api_preg_match_all('#\[([^[]*)\]#', $str, $arr);
                                $str = str_replace('\r\n', '', $str);

                                $choice = $arr[1];
                                if (isset($choice[$j])) {
                                    $tmp = api_strrpos($choice[$j], ' / ');
                                    $choice[$j] = api_substr($choice[$j], 0, $tmp);
                                    $choice[$j] = trim($choice[$j]);
                                    // Needed to let characters ' and " to work as part of an answer
                                    $choice[$j] = stripslashes($choice[$j]);
                                } else {
                                    $choice[$j] = null;
                                }
                            } else {
                                // This value is the user input, not escaped while correct answer is escaped by ckeditor
                                $choice[$j] = api_htmlentities(trim($choice[$j]));
                            }

                            $user_tags[] = $choice[$j];
                            // Put the contents of the [] answer tag into correct_tags[]
                            $correct_tags[] = api_substr($temp, 0, $pos);
                            $j++;
                            $temp = api_substr($temp, $pos + 1);
                        }
                        $answer = '';
                        $real_correct_tags = $correct_tags;
                        $chosen_list = [];

                        for ($i = 0; $i < count($real_correct_tags); $i++) {
                            if ($i == 0) {
                                $answer .= $real_text[0];
                            }
                            if (!$switchable_answer_set) {
                                // Needed to parse ' and " characters
                                $user_tags[$i] = stripslashes($user_tags[$i]);
                                if ($correct_tags[$i] == $user_tags[$i]) {
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    // adds the word in green at the end of the string
                                    $answer .= $correct_tags[$i];
                                } elseif (!empty($user_tags[$i])) {
                                    // else if the word entered by the student IS NOT the same as
                                    // the one defined by the professor
                                    // adds the word in red at the end of the string, and strikes it
                                    $answer .= '<font color="red"><s>'.$user_tags[$i].'</s></font>';
                                } else {
                                    // adds a tabulation if no word has been typed by the student
                                    $answer .= ''; // remove &nbsp; that causes issue
                                }
                            } else {
                                // switchable fill in the blanks
                                if (in_array($user_tags[$i], $correct_tags)) {
                                    $chosen_list[] = $user_tags[$i];
                                    $correct_tags = array_diff($correct_tags, $chosen_list);
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    // adds the word in green at the end of the string
                                    $answer .= $user_tags[$i];
                                } elseif (!empty($user_tags[$i])) {
                                    // else if the word entered by the student IS NOT the same
                                    // as the one defined by the professor
                                    // adds the word in red at the end of the string, and strikes it
                                    $answer .= '<font color="red"><s>'.$user_tags[$i].'</s></font>';
                                } else {
                                    // adds a tabulation if no word has been typed by the student
                                    $answer .= ''; // remove &nbsp; that causes issue
                                }
                            }

                            // adds the correct word, followed by ] to close the blank
                            $answer .= ' / <font color="green"><b>'.$real_correct_tags[$i].'</b></font>]';
                            if (isset($real_text[$i + 1])) {
                                $answer .= $real_text[$i + 1];
                            }
                        }
                    } else {
                        // insert the student result in the track_e_attempt table, field answer
                        // $answer is the answer like in the c_quiz_answer table for the question
                        // student data are choice[]
                        $listCorrectAnswers = FillBlanks::getAnswerInfo($answer);
                        $switchableAnswerSet = $listCorrectAnswers['switchable'];
                        $answerWeighting = $listCorrectAnswers['weighting'];
                        // user choices is an array $choice

                        // get existing user data in n the BDD
                        if ($from_database) {
                            $listStudentResults = FillBlanks::getAnswerInfo(
                                $answerFromDatabase,
                                true
                            );
                            $choice = $listStudentResults['student_answer'];
                        }

                        // loop other all blanks words
                        if (!$switchableAnswerSet) {
                            // not switchable answer, must be in the same place than teacher order
                            for ($i = 0; $i < count($listCorrectAnswers['words']); $i++) {
                                $studentAnswer = isset($choice[$i]) ? $choice[$i] : '';
                                $correctAnswer = $listCorrectAnswers['words'][$i];

                                if ($debug) {
                                    error_log("Student answer: $i");
                                    error_log($studentAnswer);
                                }

                                // This value is the user input, not escaped while correct answer is escaped by ckeditor
                                // Works with cyrillic alphabet and when using ">" chars see #7718 #7610 #7618
                                // ENT_QUOTES is used in order to transform ' to &#039;
                                if (!$from_database) {
                                    $studentAnswer = FillBlanks::clearStudentAnswer($studentAnswer);
                                    if ($debug) {
                                        error_log("Student answer cleaned:");
                                        error_log($studentAnswer);
                                    }
                                }

                                $isAnswerCorrect = 0;
                                if (FillBlanks::isStudentAnswerGood($studentAnswer, $correctAnswer, $from_database)) {
                                    // gives the related weighting to the student
                                    $questionScore += $answerWeighting[$i];
                                    // increments total score
                                    $totalScore += $answerWeighting[$i];
                                    $isAnswerCorrect = 1;
                                }
                                if ($debug) {
                                    error_log("isAnswerCorrect $i: $isAnswerCorrect");
                                }

                                $studentAnswerToShow = $studentAnswer;
                                $type = FillBlanks::getFillTheBlankAnswerType($correctAnswer);
                                if ($debug) {
                                    error_log("Fill in blank type: $type");
                                }
                                if ($type == FillBlanks::FILL_THE_BLANK_MENU) {
                                    $listMenu = FillBlanks::getFillTheBlankMenuAnswers($correctAnswer, false);
                                    if ($studentAnswer != '') {
                                        foreach ($listMenu as $item) {
                                            if (sha1($item) == $studentAnswer) {
                                                $studentAnswerToShow = $item;
                                            }
                                        }
                                    }
                                }
                                $listCorrectAnswers['student_answer'][$i] = $studentAnswerToShow;
                                $listCorrectAnswers['student_score'][$i] = $isAnswerCorrect;
                            }
                        } else {
                            // switchable answer
                            $listStudentAnswerTemp = $choice;
                            $listTeacherAnswerTemp = $listCorrectAnswers['words'];

                            // for every teacher answer, check if there is a student answer
                            for ($i = 0; $i < count($listStudentAnswerTemp); $i++) {
                                $studentAnswer = trim($listStudentAnswerTemp[$i]);
                                $studentAnswerToShow = $studentAnswer;

                                if ($debug) {
                                    error_log("Student answer: $i");
                                    error_log($studentAnswer);
                                }

                                $found = false;
                                for ($j = 0; $j < count($listTeacherAnswerTemp); $j++) {
                                    $correctAnswer = $listTeacherAnswerTemp[$j];
                                    $type = FillBlanks::getFillTheBlankAnswerType($correctAnswer);
                                    if ($type == FillBlanks::FILL_THE_BLANK_MENU) {
                                        $listMenu = FillBlanks::getFillTheBlankMenuAnswers($correctAnswer, false);
                                        if (!empty($studentAnswer)) {
                                            foreach ($listMenu as $key => $item) {
                                                if ($key == $correctAnswer) {
                                                    $studentAnswerToShow = $item;
                                                    break;
                                                }
                                            }
                                        }
                                    }

                                    if (!$found) {
                                        if (FillBlanks::isStudentAnswerGood(
                                            $studentAnswer,
                                            $correctAnswer,
                                            $from_database
                                        )
                                        ) {
                                            $questionScore += $answerWeighting[$i];
                                            $totalScore += $answerWeighting[$i];
                                            $listTeacherAnswerTemp[$j] = '';
                                            $found = true;
                                        }
                                    }
                                }
                                $listCorrectAnswers['student_answer'][$i] = $studentAnswerToShow;
                                if (!$found) {
                                    $listCorrectAnswers['student_score'][$i] = 0;
                                } else {
                                    $listCorrectAnswers['student_score'][$i] = 1;
                                }
                            }
                        }
                        $answer = FillBlanks::getAnswerInStudentAttempt($listCorrectAnswers);
                    }
                    break;
                case CALCULATED_ANSWER:
                    $calculatedAnswerList = Session::read('calculatedAnswerId');
                    if (!empty($calculatedAnswerList)) {
                        $answer = $objAnswerTmp->selectAnswer($calculatedAnswerList[$questionId]);
                        $preArray = explode('@@', $answer);
                        $last = count($preArray) - 1;
                        $answer = '';
                        for ($k = 0; $k < $last; $k++) {
                            $answer .= $preArray[$k];
                        }
                        $answerWeighting = [$answerWeighting];
                        // we save the answer because it will be modified
                        $temp = $answer;
                        $answer = '';
                        $j = 0;
                        // initialise answer tags
                        $userTags = $correctTags = $realText = [];
                        // the loop will stop at the end of the text
                        while (1) {
                            // quits the loop if there are no more blanks (detect '[')
                            if ($temp == false || ($pos = api_strpos($temp, '[')) === false) {
                                // adds the end of the text
                                $answer = $temp;
                                $realText[] = $answer;
                                break; //no more "blanks", quit the loop
                            }
                            // adds the piece of text that is before the blank
                            // and ends with '[' into a general storage array
                            $realText[] = api_substr($temp, 0, $pos + 1);
                            $answer .= api_substr($temp, 0, $pos + 1);
                            // take the string remaining (after the last "[" we found)
                            $temp = api_substr($temp, $pos + 1);
                            // quit the loop if there are no more blanks, and update $pos to the position of next ']'
                            if (($pos = api_strpos($temp, ']')) === false) {
                                // adds the end of the text
                                $answer .= $temp;
                                break;
                            }

                            if ($from_database) {
                                $sql = "SELECT answer FROM ".$TBL_TRACK_ATTEMPT."
                                    WHERE
                                        exe_id = '".$exeId."' AND
                                        question_id = ".intval($questionId);
                                $result = Database::query($sql);
                                $str = Database::result($result, 0, 'answer');
                                api_preg_match_all('#\[([^[]*)\]#', $str, $arr);
                                $str = str_replace('\r\n', '', $str);
                                $choice = $arr[1];
                                if (isset($choice[$j])) {
                                    $tmp = api_strrpos($choice[$j], ' / ');

                                    if ($tmp) {
                                        $choice[$j] = api_substr($choice[$j], 0, $tmp);
                                    } else {
                                        $tmp = ltrim($tmp, '[');
                                        $tmp = rtrim($tmp, ']');
                                    }

                                    $choice[$j] = trim($choice[$j]);
                                    // Needed to let characters ' and " to work as part of an answer
                                    $choice[$j] = stripslashes($choice[$j]);
                                } else {
                                    $choice[$j] = null;
                                }
                            } else {
                                // This value is the user input not escaped while correct answer is escaped by ckeditor
                                $choice[$j] = api_htmlentities(trim($choice[$j]));
                            }
                            $userTags[] = $choice[$j];
                            // put the contents of the [] answer tag into correct_tags[]
                            $correctTags[] = api_substr($temp, 0, $pos);
                            $j++;
                            $temp = api_substr($temp, $pos + 1);
                        }
                        $answer = '';
                        $realCorrectTags = $correctTags;
                        $calculatedStatus = Display::label(get_lang('Incorrect'), 'danger');
                        $expectedAnswer = '';
                        $calculatedChoice = '';

                        for ($i = 0; $i < count($realCorrectTags); $i++) {
                            if ($i == 0) {
                                $answer .= $realText[0];
                            }
                            // Needed to parse ' and " characters
                            $userTags[$i] = stripslashes($userTags[$i]);
                            if ($correctTags[$i] == $userTags[$i]) {
                                // gives the related weighting to the student
                                $questionScore += $answerWeighting[$i];
                                // increments total score
                                $totalScore += $answerWeighting[$i];
                                // adds the word in green at the end of the string
                                $answer .= $correctTags[$i];
                                $calculatedChoice = $correctTags[$i];
                            } elseif (!empty($userTags[$i])) {
                                // else if the word entered by the student IS NOT the same as
                                // the one defined by the professor
                                // adds the word in red at the end of the string, and strikes it
                                $answer .= '<font color="red"><s>'.$userTags[$i].'</s></font>';
                                $calculatedChoice = $userTags[$i];
                            } else {
                                // adds a tabulation if no word has been typed by the student
                                $answer .= ''; // remove &nbsp; that causes issue
                            }
                            // adds the correct word, followed by ] to close the blank

                            if ($this->results_disabled != EXERCISE_FEEDBACK_TYPE_EXAM) {
                                $answer .= ' / <font color="green"><b>'.$realCorrectTags[$i].'</b></font>';
                                $calculatedStatus = Display::label(get_lang('Correct'), 'success');
                                $expectedAnswer = $realCorrectTags[$i];
                            }
                            $answer .= ']';

                            if (isset($realText[$i + 1])) {
                                $answer .= $realText[$i + 1];
                            }
                        }
                    } else {
                        if ($from_database) {
                            $sql = "SELECT *
                                FROM $TBL_TRACK_ATTEMPT
                                WHERE
                                    exe_id = $exeId AND
                                    question_id = $questionId";
                            $result = Database::query($sql);
                            $resultData = Database::fetch_array($result, 'ASSOC');
                            $answer = $resultData['answer'];
                            $questionScore = $resultData['marks'];
                        }
                    }
                    break;
                case FREE_ANSWER:
                    if ($from_database) {
                        $sql = "SELECT answer, marks FROM $TBL_TRACK_ATTEMPT
                                 WHERE 
                                    exe_id = $exeId AND 
                                    question_id= ".$questionId;
                        $result = Database::query($sql);
                        $data = Database::fetch_array($result);

                        $choice = $data['answer'];
                        $choice = str_replace('\r\n', '', $choice);
                        $choice = stripslashes($choice);
                        $questionScore = $data['marks'];

                        if ($questionScore == -1) {
                            $totalScore += 0;
                        } else {
                            $totalScore += $questionScore;
                        }
                        if ($questionScore == '') {
                            $questionScore = 0;
                        }
                        $arrques = $questionName;
                        $arrans = $choice;
                    } else {
                        $studentChoice = $choice;
                        if ($studentChoice) {
                            //Fixing negative puntation see #2193
                            $questionScore = 0;
                            $totalScore += 0;
                        }
                    }
                    break;
                case ORAL_EXPRESSION:
                    if ($from_database) {
                        $query = "SELECT answer, marks 
                                  FROM $TBL_TRACK_ATTEMPT
                                  WHERE 
                                        exe_id = $exeId AND 
                                        question_id = $questionId
                                 ";
                        $resq = Database::query($query);
                        $row = Database::fetch_assoc($resq);
                        $choice = $row['answer'];
                        $choice = str_replace('\r\n', '', $choice);
                        $choice = stripslashes($choice);
                        $questionScore = $row['marks'];
                        if ($questionScore == -1) {
                            $totalScore += 0;
                        } else {
                            $totalScore += $questionScore;
                        }
                        $arrques = $questionName;
                        $arrans = $choice;
                    } else {
                        $studentChoice = $choice;
                        if ($studentChoice) {
                            //Fixing negative puntation see #2193
                            $questionScore = 0;
                            $totalScore += 0;
                        }
                    }
                    break;
                case DRAGGABLE:
                case MATCHING_DRAGGABLE:
                case MATCHING:
                    if ($from_database) {
                        $sql = "SELECT id, answer, id_auto
                                FROM $table_ans
                                WHERE
                                    c_id = $course_id AND
                                    question_id = $questionId AND
                                    correct = 0
                                ";
                        $result = Database::query($sql);
                        // Getting the real answer
                        $real_list = [];
                        while ($realAnswer = Database::fetch_array($result)) {
                            $real_list[$realAnswer['id_auto']] = $realAnswer['answer'];
                        }

                        $sql = "SELECT id, answer, correct, id_auto, ponderation
                                FROM $table_ans
                                WHERE
                                    c_id = $course_id AND
                                    question_id = $questionId AND
                                    correct <> 0
                                ORDER BY id_auto";
                        $result = Database::query($sql);
                        $options = [];
                        while ($row = Database::fetch_array($result, 'ASSOC')) {
                            $options[] = $row;
                        }

                        $questionScore = 0;
                        $counterAnswer = 1;
                        foreach ($options as $a_answers) {
                            $i_answer_id = $a_answers['id']; //3
                            $s_answer_label = $a_answers['answer']; // your daddy - your mother
                            $i_answer_correct_answer = $a_answers['correct']; //1 - 2
                            $i_answer_id_auto = $a_answers['id_auto']; // 3 - 4

                            $sql = "SELECT answer FROM $TBL_TRACK_ATTEMPT
                                    WHERE
                                        exe_id = '$exeId' AND
                                        question_id = '$questionId' AND
                                        position = '$i_answer_id_auto'";
                            $result = Database::query($sql);
                            $s_user_answer = 0;
                            if (Database::num_rows($result) > 0) {
                                //  rich - good looking
                                $s_user_answer = Database::result($result, 0, 0);
                            }
                            $i_answerWeighting = $a_answers['ponderation'];
                            $user_answer = '';
                            $status = Display::label(get_lang('Incorrect'), 'danger');

                            if (!empty($s_user_answer)) {
                                if ($answerType == DRAGGABLE) {
                                    if ($s_user_answer == $i_answer_correct_answer) {
                                        $questionScore += $i_answerWeighting;
                                        $totalScore += $i_answerWeighting;
                                        $user_answer = Display::label(get_lang('Correct'), 'success');
                                        if ($this->showExpectedChoice()) {
                                            $user_answer = $answerMatching[$i_answer_id_auto];
                                        }
                                        $status = Display::label(get_lang('Correct'), 'success');
                                    } else {
                                        $user_answer = Display::label(get_lang('Incorrect'), 'danger');
                                        if ($this->showExpectedChoice()) {
                                            $data = $options[$real_list[$s_user_answer] - 1];
                                            $user_answer = $data['answer'];
                                        }
                                    }
                                } else {
                                    if ($s_user_answer == $i_answer_correct_answer) {
                                        $questionScore += $i_answerWeighting;
                                        $totalScore += $i_answerWeighting;
                                        $status = Display::label(get_lang('Correct'), 'success');

                                        // Try with id
                                        if (isset($real_list[$i_answer_id])) {
                                            $user_answer = Display::span(
                                                $real_list[$i_answer_id],
                                                ['style' => 'color: #008000; font-weight: bold;']
                                            );
                                        }

                                        // Try with $i_answer_id_auto
                                        if (empty($user_answer)) {
                                            if (isset($real_list[$i_answer_id_auto])) {
                                                $user_answer = Display::span(
                                                    $real_list[$i_answer_id_auto],
                                                    ['style' => 'color: #008000; font-weight: bold;']
                                                );
                                            }
                                        }

                                        if (isset($real_list[$i_answer_correct_answer])) {
                                            $user_answer = Display::span(
                                                $real_list[$i_answer_correct_answer],
                                                ['style' => 'color: #008000; font-weight: bold;']
                                            );
                                        }
                                    } else {
                                        $user_answer = Display::span(
                                            $real_list[$s_user_answer],
                                            ['style' => 'color: #FF0000; text-decoration: line-through;']
                                        );
                                        if ($this->showExpectedChoice()) {
                                            if (isset($real_list[$s_user_answer])) {
                                                $user_answer = Display::span($real_list[$s_user_answer]);
                                            }
                                        }
                                    }
                                }
                            } elseif ($answerType == DRAGGABLE) {
                                $user_answer = Display::label(get_lang('Incorrect'), 'danger');
                                if ($this->showExpectedChoice()) {
                                    $user_answer = '';
                                }
                            } else {
                                $user_answer = Display::span(
                                    get_lang('Incorrect').' &nbsp;',
                                    ['style' => 'color: #FF0000; text-decoration: line-through;']
                                );
                                if ($this->showExpectedChoice()) {
                                    $user_answer = '';
                                }
                            }

                            if ($show_result) {
                                if ($this->showExpectedChoice() === false &&
                                    $showTotalScoreAndUserChoicesInLastAttempt === false
                                ) {
                                    $user_answer = '';
                                }
                                switch ($answerType) {
                                    case MATCHING:
                                    case MATCHING_DRAGGABLE:
                                        echo '<tr>';
                                        if (!in_array(
                                            $this->results_disabled,
                                            [
                                                RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
                                            ]
                                        )
                                        ) {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$user_answer.'</td>';
                                        } else {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            $status = Display::label(get_lang('Correct'), 'success');
                                        }

                                        if ($this->showExpectedChoice()) {
                                            if ($this->showExpectedChoiceColumn()) {
                                                echo '<td>';
                                                if (in_array($answerType, [MATCHING, MATCHING_DRAGGABLE])) {
                                                    if (isset($real_list[$i_answer_correct_answer]) &&
                                                        $showTotalScoreAndUserChoicesInLastAttempt == true
                                                    ) {
                                                        echo Display::span(
                                                            $real_list[$i_answer_correct_answer]
                                                        );
                                                    }
                                                }
                                                echo '</td>';
                                            }
                                            echo '<td>'.$status.'</td>';
                                        } else {
                                            if (in_array($answerType, [MATCHING, MATCHING_DRAGGABLE])) {
                                                if (isset($real_list[$i_answer_correct_answer]) &&
                                                    $showTotalScoreAndUserChoicesInLastAttempt === true
                                                ) {
                                                    if ($this->showExpectedChoiceColumn()) {
                                                        echo '<td>';
                                                        echo Display::span(
                                                            $real_list[$i_answer_correct_answer],
                                                            ['style' => 'color: #008000; font-weight: bold;']
                                                        );
                                                        echo '</td>';
                                                    }
                                                }
                                            }
                                        }
                                        echo '</tr>';
                                        break;
                                    case DRAGGABLE:
                                        if ($showTotalScoreAndUserChoicesInLastAttempt == false) {
                                            $s_answer_label = '';
                                        }
                                        echo '<tr>';
                                        if ($this->showExpectedChoice()) {
                                            if (!in_array($this->results_disabled, [
                                                RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
                                                //RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
                                            ])
                                            ) {
                                                echo '<td>'.$user_answer.'</td>';
                                            } else {
                                                $status = Display::label(get_lang('Correct'), 'success');
                                            }
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$status.'</td>';
                                        } else {
                                            echo '<td>'.$s_answer_label.'</td>';
                                            echo '<td>'.$user_answer.'</td>';
                                            echo '<td>';
                                            if (in_array($answerType, [MATCHING, MATCHING_DRAGGABLE])) {
                                                if (isset($real_list[$i_answer_correct_answer]) &&
                                                    $showTotalScoreAndUserChoicesInLastAttempt === true
                                                ) {
                                                    echo Display::span(
                                                        $real_list[$i_answer_correct_answer],
                                                        ['style' => 'color: #008000; font-weight: bold;']
                                                    );
                                                }
                                            }
                                            echo '</td>';
                                        }
                                        echo '</tr>';
                                        break;
                                }
                            }
                            $counterAnswer++;
                        }
                        break 2; // break the switch and the "for" condition
                    } else {
                        if ($answerCorrect) {
                            if (isset($choice[$answerAutoId]) &&
                                $answerCorrect == $choice[$answerAutoId]
                            ) {
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                                $user_answer = Display::span($answerMatching[$choice[$answerAutoId]]);
                            } else {
                                if (isset($answerMatching[$choice[$answerAutoId]])) {
                                    $user_answer = Display::span(
                                        $answerMatching[$choice[$answerAutoId]],
                                        ['style' => 'color: #FF0000; text-decoration: line-through;']
                                    );
                                }
                            }
                            $matching[$answerAutoId] = $choice[$answerAutoId];
                        }
                    }
                    break;
                case HOT_SPOT:
                    if ($from_database) {
                        $TBL_TRACK_HOTSPOT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);
                        // Check auto id
                        $sql = "SELECT hotspot_correct
                                FROM $TBL_TRACK_HOTSPOT
                                WHERE
                                    hotspot_exe_id = $exeId AND
                                    hotspot_question_id= $questionId AND
                                    hotspot_answer_id = $answerAutoId
                                ORDER BY hotspot_id ASC";
                        $result = Database::query($sql);
                        if (Database::num_rows($result)) {
                            $studentChoice = Database::result(
                                $result,
                                0,
                                'hotspot_correct'
                            );

                            if ($studentChoice) {
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                            }
                        } else {
                            // If answer.id is different:
                            $sql = "SELECT hotspot_correct
                                FROM $TBL_TRACK_HOTSPOT
                                WHERE
                                    hotspot_exe_id = $exeId AND
                                    hotspot_question_id= $questionId AND
                                    hotspot_answer_id = ".intval($answerId)."
                                ORDER BY hotspot_id ASC";
                            $result = Database::query($sql);

                            if (Database::num_rows($result)) {
                                $studentChoice = Database::result(
                                    $result,
                                    0,
                                    'hotspot_correct'
                                );

                                if ($studentChoice) {
                                    $questionScore += $answerWeighting;
                                    $totalScore += $answerWeighting;
                                }
                            } else {
                                // check answer.iid
                                if (!empty($answerIid)) {
                                    $sql = "SELECT hotspot_correct
                                            FROM $TBL_TRACK_HOTSPOT
                                            WHERE
                                                hotspot_exe_id = $exeId AND
                                                hotspot_question_id= $questionId AND
                                                hotspot_answer_id = ".intval($answerIid)."
                                            ORDER BY hotspot_id ASC";
                                    $result = Database::query($sql);

                                    $studentChoice = Database::result(
                                        $result,
                                        0,
                                        'hotspot_correct'
                                    );

                                    if ($studentChoice) {
                                        $questionScore += $answerWeighting;
                                        $totalScore += $answerWeighting;
                                    }
                                }
                            }
                        }
                    } else {
                        if (!isset($choice[$answerAutoId]) && !isset($choice[$answerIid])) {
                            $choice[$answerAutoId] = 0;
                            $choice[$answerIid] = 0;
                        } else {
                            $studentChoice = $choice[$answerAutoId];
                            if (empty($studentChoice)) {
                                $studentChoice = $choice[$answerIid];
                            }
                            $choiceIsValid = false;
                            if (!empty($studentChoice)) {
                                $hotspotType = $objAnswerTmp->selectHotspotType($answerId);
                                $hotspotCoordinates = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                $choicePoint = Geometry::decodePoint($studentChoice);

                                switch ($hotspotType) {
                                    case 'square':
                                        $hotspotProperties = Geometry::decodeSquare($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInSquare($hotspotProperties, $choicePoint);
                                        break;
                                    case 'circle':
                                        $hotspotProperties = Geometry::decodeEllipse($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInEllipse($hotspotProperties, $choicePoint);
                                        break;
                                    case 'poly':
                                        $hotspotProperties = Geometry::decodePolygon($hotspotCoordinates);
                                        $choiceIsValid = Geometry::pointIsInPolygon($hotspotProperties, $choicePoint);
                                        break;
                                }
                            }

                            $choice[$answerAutoId] = 0;
                            if ($choiceIsValid) {
                                $questionScore += $answerWeighting;
                                $totalScore += $answerWeighting;
                                $choice[$answerAutoId] = 1;
                                $choice[$answerIid] = 1;
                            }
                        }
                    }
                    break;
                case HOT_SPOT_ORDER:
                    // @todo never added to chamilo
                    // for hotspot with fixed order
                    $studentChoice = $choice['order'][$answerId];
                    if ($studentChoice == $answerId) {
                        $questionScore += $answerWeighting;
                        $totalScore += $answerWeighting;
                        $studentChoice = true;
                    } else {
                        $studentChoice = false;
                    }
                    break;
                case HOT_SPOT_DELINEATION:
                    // for hotspot with delineation
                    if ($from_database) {
                        // getting the user answer
                        $TBL_TRACK_HOTSPOT = Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);
                        $query = "SELECT hotspot_correct, hotspot_coordinate
                                    FROM $TBL_TRACK_HOTSPOT
                                    WHERE
                                        hotspot_exe_id = '".$exeId."' AND
                                        hotspot_question_id= '".$questionId."' AND
                                        hotspot_answer_id='1'";
                        //by default we take 1 because it's a delineation
                        $resq = Database::query($query);
                        $row = Database::fetch_array($resq, 'ASSOC');

                        $choice = $row['hotspot_correct'];
                        $user_answer = $row['hotspot_coordinate'];

                        // THIS is very important otherwise the poly_compile will throw an error!!
                        // round-up the coordinates
                        $coords = explode('/', $user_answer);
                        $user_array = '';
                        foreach ($coords as $coord) {
                            list($x, $y) = explode(';', $coord);
                            $user_array .= round($x).';'.round($y).'/';
                        }
                        $user_array = substr($user_array, 0, -1);
                    } else {
                        if (!empty($studentChoice)) {
                            $newquestionList[] = $questionId;
                        }

                        if ($answerId === 1) {
                            $studentChoice = $choice[$answerId];
                            $questionScore += $answerWeighting;

                            if ($hotspot_delineation_result[1] == 1) {
                                $totalScore += $answerWeighting; //adding the total
                            }
                        }
                    }
                    $_SESSION['hotspot_coord'][1] = $delineation_cord;
                    $_SESSION['hotspot_dest'][1] = $answer_delineation_destination;
                    break;
                case ANNOTATION:
                    if ($from_database) {
                        $sql = "SELECT answer, marks FROM $TBL_TRACK_ATTEMPT
                                WHERE 
                                  exe_id = $exeId AND 
                                  question_id= ".$questionId;
                        $resq = Database::query($sql);
                        $data = Database::fetch_array($resq);

                        $questionScore = empty($data['marks']) ? 0 : $data['marks'];
                        $totalScore += $questionScore == -1 ? 0 : $questionScore;

                        $arrques = $questionName;
                        break;
                    }
                    $studentChoice = $choice;
                    if ($studentChoice) {
                        $questionScore = 0;
                        $totalScore += 0;
                    }
                    break;
            } // end switch Answertype

            if ($show_result) {
                if ($debug) {
                    error_log('Showing questions $from '.$from);
                }

                if ($from === 'exercise_result') {
                    //display answers (if not matching type, or if the answer is correct)
                    if (!in_array($answerType, [MATCHING, DRAGGABLE, MATCHING_DRAGGABLE]) ||
                        $answerCorrect
                    ) {
                        if (in_array(
                            $answerType,
                            [
                                UNIQUE_ANSWER,
                                UNIQUE_ANSWER_IMAGE,
                                UNIQUE_ANSWER_NO_OPTION,
                                MULTIPLE_ANSWER,
                                MULTIPLE_ANSWER_COMBINATION,
                                GLOBAL_MULTIPLE_ANSWER,
                                READING_COMPREHENSION,
                            ]
                        )) {
                            ExerciseShowFunctions::display_unique_or_multiple_answer(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt,
                                $this->export
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {
                            ExerciseShowFunctions::display_multiple_answer_true_false(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                $questionId,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
                            ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                $this,
                                $feedback_type,
                                $studentChoice,
                                $studentChoiceDegree,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                $questionId,
                                $results_disabled
                            );
                        } elseif ($answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE) {
                            ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                $this,
                                $feedback_type,
                                $answerType,
                                $studentChoice,
                                $answer,
                                $answerComment,
                                $answerCorrect,
                                0,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == FILL_IN_BLANKS) {
                            ExerciseShowFunctions::display_fill_in_blanks_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                0,
                                0,
                                $results_disabled,
                                '',
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == CALCULATED_ANSWER) {
                            ExerciseShowFunctions::display_calculated_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                0,
                                0,
                                $results_disabled,
                                $showTotalScoreAndUserChoicesInLastAttempt,
                                $expectedAnswer,
                                $calculatedChoice,
                                $calculatedStatus
                            );
                        } elseif ($answerType == FREE_ANSWER) {
                            ExerciseShowFunctions::display_free_answer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                        } elseif ($answerType == ORAL_EXPRESSION) {
                            // to store the details of open questions in an array to be used in mail
                            /** @var OralExpression $objQuestionTmp */
                            ExerciseShowFunctions::display_oral_expression_answer(
                                $feedback_type,
                                $choice,
                                0,
                                0,
                                $objQuestionTmp->getFileUrl(true),
                                $results_disabled,
                                $questionScore
                            );
                        } elseif ($answerType == HOT_SPOT) {
                            $correctAnswerId = 0;
                            /**
                             * @var int
                             * @var TrackEHotspot $hotspot
                             */
                            foreach ($orderedHotspots as $correctAnswerId => $hotspot) {
                                if ($hotspot->getHotspotAnswerId() == $answerAutoId) {
                                    break;
                                }
                            }

                            // force to show whether the choice is correct or not
                            $showTotalScoreAndUserChoicesInLastAttempt = true;
                            ExerciseShowFunctions::display_hotspot_answer(
                                $feedback_type,
                                ++$correctAnswerId,
                                $answer,
                                $studentChoice,
                                $answerComment,
                                $results_disabled,
                                $correctAnswerId,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                        } elseif ($answerType == HOT_SPOT_ORDER) {
                            ExerciseShowFunctions::display_hotspot_order_answer(
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment
                            );
                        } elseif ($answerType == HOT_SPOT_DELINEATION) {
                            $user_answer = $_SESSION['exerciseResultCoordinates'][$questionId];

                            //round-up the coordinates
                            $coords = explode('/', $user_answer);
                            $user_array = '';
                            foreach ($coords as $coord) {
                                if (!empty($coord)) {
                                    $parts = explode(';', $coord);
                                    if (!empty($parts)) {
                                        $user_array .= round($parts[0]).';'.round($parts[1]).'/';
                                    }
                                }
                            }
                            $user_array = substr($user_array, 0, -1);

                            if ($next) {
                                $user_answer = $user_array;
                                // we compare only the delineation not the other points
                                $answer_question = $_SESSION['hotspot_coord'][1];
                                $answerDestination = $_SESSION['hotspot_dest'][1];

                                //calculating the area
                                $poly_user = convert_coordinates($user_answer, '/');
                                $poly_answer = convert_coordinates($answer_question, '|');
                                $max_coord = poly_get_max($poly_user, $poly_answer);
                                $poly_user_compiled = poly_compile($poly_user, $max_coord);
                                $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                $poly_results = poly_result($poly_answer_compiled, $poly_user_compiled, $max_coord);

                                $overlap = $poly_results['both'];
                                $poly_answer_area = $poly_results['s1'];
                                $poly_user_area = $poly_results['s2'];
                                $missing = $poly_results['s1Only'];
                                $excess = $poly_results['s2Only'];

                                //$overlap = round(polygons_overlap($poly_answer,$poly_user));
                                // //this is an area in pixels
                                if ($debug > 0) {
                                    error_log(__LINE__.' - Polygons results are '.print_r($poly_results, 1), 0);
                                }

                                if ($overlap < 1) {
                                    //shortcut to avoid complicated calculations
                                    $final_overlap = 0;
                                    $final_missing = 100;
                                    $final_excess = 100;
                                } else {
                                    // the final overlap is the percentage of the initial polygon
                                    // that is overlapped by the user's polygon
                                    $final_overlap = round(((float) $overlap / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final overlap is '.$final_overlap, 0);
                                    }
                                    // the final missing area is the percentage of the initial polygon
                                    // that is not overlapped by the user's polygon
                                    $final_missing = 100 - $final_overlap;
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final missing is '.$final_missing, 0);
                                    }
                                    // the final excess area is the percentage of the initial polygon's size
                                    // that is covered by the user's polygon outside of the initial polygon
                                    $final_excess = round((((float) $poly_user_area - (float) $overlap) / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final excess is '.$final_excess, 0);
                                    }
                                }

                                //checking the destination parameters parsing the "@@"
                                $destination_items = explode(
                                    '@@',
                                    $answerDestination
                                );
                                $threadhold_total = $destination_items[0];
                                $threadhold_items = explode(
                                    ';',
                                    $threadhold_total
                                );
                                $threadhold1 = $threadhold_items[0]; // overlap
                                $threadhold2 = $threadhold_items[1]; // excess
                                $threadhold3 = $threadhold_items[2]; //missing

                                // if is delineation
                                if ($answerId === 1) {
                                    //setting colors
                                    if ($final_overlap >= $threadhold1) {
                                        $overlap_color = true; //echo 'a';
                                    }
                                    //echo $excess.'-'.$threadhold2;
                                    if ($final_excess <= $threadhold2) {
                                        $excess_color = true; //echo 'b';
                                    }
                                    //echo '--------'.$missing.'-'.$threadhold3;
                                    if ($final_missing <= $threadhold3) {
                                        $missing_color = true; //echo 'c';
                                    }

                                    // if pass
                                    if ($final_overlap >= $threadhold1 &&
                                        $final_missing <= $threadhold3 &&
                                        $final_excess <= $threadhold2
                                    ) {
                                        $next = 1; //go to the oars
                                        $result_comment = get_lang('Acceptable');
                                        $final_answer = 1; // do not update with  update_exercise_attempt
                                    } else {
                                        $next = 0;
                                        $result_comment = get_lang('Unacceptable');
                                        $comment = $answerDestination = $objAnswerTmp->selectComment(1);
                                        $answerDestination = $objAnswerTmp->selectDestination(1);
                                        // checking the destination parameters parsing the "@@"
                                        $destination_items = explode('@@', $answerDestination);
                                    }
                                } elseif ($answerId > 1) {
                                    if ($objAnswerTmp->selectHotspotType($answerId) == 'noerror') {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - answerId is of type noerror', 0);
                                        }
                                        //type no error shouldn't be treated
                                        $next = 1;
                                        continue;
                                    }
                                    if ($debug > 0) {
                                        error_log(__LINE__.' - answerId is >1 so we\'re probably in OAR', 0);
                                    }
                                    $delineation_cord = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                    $poly_answer = convert_coordinates($delineation_cord, '|');
                                    $max_coord = poly_get_max($poly_user, $poly_answer);
                                    $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                    $overlap = poly_touch($poly_user_compiled, $poly_answer_compiled, $max_coord);

                                    if ($overlap == false) {
                                        //all good, no overlap
                                        $next = 1;
                                        continue;
                                    } else {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                        }
                                        $organs_at_risk_hit++;
                                        //show the feedback
                                        $next = 0;
                                        $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
                                        $answerDestination = $objAnswerTmp->selectDestination($answerId);

                                        $destination_items = explode('@@', $answerDestination);
                                        $try_hotspot = $destination_items[1];
                                        $lp_hotspot = $destination_items[2];
                                        $select_question_hotspot = $destination_items[3];
                                        $url_hotspot = $destination_items[4];
                                    }
                                }
                            } else {
                                // the first delineation feedback
                                if ($debug > 0) {
                                    error_log(__LINE__.' first', 0);
                                }
                            }
                        } elseif (in_array($answerType, [MATCHING, MATCHING_DRAGGABLE])) {
                            echo '<tr>';
                            echo Display::tag('td', $answerMatching[$answerId]);
                            echo Display::tag(
                                'td',
                                "$user_answer / ".Display::tag(
                                    'strong',
                                    $answerMatching[$answerCorrect],
                                    ['style' => 'color: #008000; font-weight: bold;']
                                )
                            );
                            echo '</tr>';
                        } elseif ($answerType == ANNOTATION) {
                            ExerciseShowFunctions::displayAnnotationAnswer(
                                $feedback_type,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                        }
                    }
                } else {
                    if ($debug) {
                        error_log('Showing questions $from '.$from);
                    }

                    switch ($answerType) {
                        case UNIQUE_ANSWER:
                        case UNIQUE_ANSWER_IMAGE:
                        case UNIQUE_ANSWER_NO_OPTION:
                        case MULTIPLE_ANSWER:
                        case GLOBAL_MULTIPLE_ANSWER:
                        case MULTIPLE_ANSWER_COMBINATION:
                        case READING_COMPREHENSION:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_unique_or_multiple_answer(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt,
                                    $this->export
                                );
                            } else {
                                ExerciseShowFunctions::display_unique_or_multiple_answer(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt,
                                    $this->export
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            } else {
                                ExerciseShowFunctions::display_multiple_answer_combination_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_TRUE_FALSE:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::display_multiple_answer_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    $answerId,
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            } else {
                                ExerciseShowFunctions::display_multiple_answer_true_false(
                                    $this,
                                    $feedback_type,
                                    $answerType,
                                    $studentChoice,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $exeId,
                                    $questionId,
                                    '',
                                    $results_disabled,
                                    $showTotalScoreAndUserChoicesInLastAttempt
                                );
                            }
                            break;
                        case MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY:
                            if ($answerId == 1) {
                                ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                    $this,
                                    $feedback_type,
                                    $studentChoice,
                                    $studentChoiceDegree,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $questionId,
                                    $results_disabled
                                );
                            } else {
                                ExerciseShowFunctions::displayMultipleAnswerTrueFalseDegreeCertainty(
                                    $this,
                                    $feedback_type,
                                    $studentChoice,
                                    $studentChoiceDegree,
                                    $answer,
                                    $answerComment,
                                    $answerCorrect,
                                    $questionId,
                                    $results_disabled
                                );
                            }
                            break;
                        case FILL_IN_BLANKS:
                            ExerciseShowFunctions::display_fill_in_blanks_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                $exeId,
                                $questionId,
                                $results_disabled,
                                $str,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case CALCULATED_ANSWER:
                            ExerciseShowFunctions::display_calculated_answer(
                                $this,
                                $feedback_type,
                                $answer,
                                $exeId,
                                $questionId,
                                $results_disabled,
                                '',
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case FREE_ANSWER:
                            echo ExerciseShowFunctions::display_free_answer(
                                $feedback_type,
                                $choice,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                            break;
                        case ORAL_EXPRESSION:
                            echo '<tr>
                                <td valign="top">'.
                                ExerciseShowFunctions::display_oral_expression_answer(
                                    $feedback_type,
                                    $choice,
                                    $exeId,
                                    $questionId,
                                    $objQuestionTmp->getFileUrl(),
                                    $results_disabled,
                                    $questionScore
                                ).'</td>
                                </tr>
                                </table>';
                            break;
                        case HOT_SPOT:
                            ExerciseShowFunctions::display_hotspot_answer(
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment,
                                $results_disabled,
                                $answerId,
                                $showTotalScoreAndUserChoicesInLastAttempt
                            );
                            break;
                        case HOT_SPOT_DELINEATION:
                            $user_answer = $user_array;
                            if ($next) {
                                $user_answer = $user_array;
                                // we compare only the delineation not the other points
                                $answer_question = $_SESSION['hotspot_coord'][1];
                                $answerDestination = $_SESSION['hotspot_dest'][1];

                                // calculating the area
                                $poly_user = convert_coordinates($user_answer, '/');
                                $poly_answer = convert_coordinates($answer_question, '|');
                                $max_coord = poly_get_max($poly_user, $poly_answer);
                                $poly_user_compiled = poly_compile($poly_user, $max_coord);
                                $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                $poly_results = poly_result($poly_answer_compiled, $poly_user_compiled, $max_coord);

                                $overlap = $poly_results['both'];
                                $poly_answer_area = $poly_results['s1'];
                                $poly_user_area = $poly_results['s2'];
                                $missing = $poly_results['s1Only'];
                                $excess = $poly_results['s2Only'];
                                if ($debug > 0) {
                                    error_log(__LINE__.' - Polygons results are '.print_r($poly_results, 1), 0);
                                }
                                if ($overlap < 1) {
                                    //shortcut to avoid complicated calculations
                                    $final_overlap = 0;
                                    $final_missing = 100;
                                    $final_excess = 100;
                                } else {
                                    // the final overlap is the percentage of the initial polygon that is overlapped by the user's polygon
                                    $final_overlap = round(((float) $overlap / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final overlap is '.$final_overlap, 0);
                                    }
                                    // the final missing area is the percentage of the initial polygon that is not overlapped by the user's polygon
                                    $final_missing = 100 - $final_overlap;
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final missing is '.$final_missing, 0);
                                    }
                                    // the final excess area is the percentage of the initial polygon's size that is covered by the user's polygon outside of the initial polygon
                                    $final_excess = round((((float) $poly_user_area - (float) $overlap) / (float) $poly_answer_area) * 100);
                                    if ($debug > 1) {
                                        error_log(__LINE__.' - Final excess is '.$final_excess, 0);
                                    }
                                }

                                // Checking the destination parameters parsing the "@@"
                                $destination_items = explode('@@', $answerDestination);
                                $threadhold_total = $destination_items[0];
                                $threadhold_items = explode(';', $threadhold_total);
                                $threadhold1 = $threadhold_items[0]; // overlap
                                $threadhold2 = $threadhold_items[1]; // excess
                                $threadhold3 = $threadhold_items[2]; //missing
                                // if is delineation
                                if ($answerId === 1) {
                                    //setting colors
                                    if ($final_overlap >= $threadhold1) {
                                        $overlap_color = true; //echo 'a';
                                    }
                                    if ($final_excess <= $threadhold2) {
                                        $excess_color = true; //echo 'b';
                                    }
                                    if ($final_missing <= $threadhold3) {
                                        $missing_color = true; //echo 'c';
                                    }

                                    // if pass
                                    if ($final_overlap >= $threadhold1 &&
                                        $final_missing <= $threadhold3 &&
                                        $final_excess <= $threadhold2
                                    ) {
                                        $next = 1; //go to the oars
                                        $result_comment = get_lang('Acceptable');
                                        $final_answer = 1; // do not update with  update_exercise_attempt
                                    } else {
                                        $next = 0;
                                        $result_comment = get_lang('Unacceptable');
                                        $comment = $answerDestination = $objAnswerTmp->selectComment(1);
                                        $answerDestination = $objAnswerTmp->selectDestination(1);
                                        //checking the destination parameters parsing the "@@"
                                        $destination_items = explode('@@', $answerDestination);
                                    }
                                } elseif ($answerId > 1) {
                                    if ($objAnswerTmp->selectHotspotType($answerId) == 'noerror') {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - answerId is of type noerror', 0);
                                        }
                                        //type no error shouldn't be treated
                                        $next = 1;
                                        break;
                                    }
                                    if ($debug > 0) {
                                        error_log(__LINE__.' - answerId is >1 so we\'re probably in OAR', 0);
                                    }
                                    $delineation_cord = $objAnswerTmp->selectHotspotCoordinates($answerId);
                                    $poly_answer = convert_coordinates($delineation_cord, '|');
                                    $max_coord = poly_get_max($poly_user, $poly_answer);
                                    $poly_answer_compiled = poly_compile($poly_answer, $max_coord);
                                    $overlap = poly_touch($poly_user_compiled, $poly_answer_compiled, $max_coord);

                                    if ($overlap == false) {
                                        //all good, no overlap
                                        $next = 1;
                                        break;
                                    } else {
                                        if ($debug > 0) {
                                            error_log(__LINE__.' - Overlap is '.$overlap.': OAR hit', 0);
                                        }
                                        $organs_at_risk_hit++;
                                        //show the feedback
                                        $next = 0;
                                        $comment = $answerDestination = $objAnswerTmp->selectComment($answerId);
                                        $answerDestination = $objAnswerTmp->selectDestination($answerId);

                                        $destination_items = explode('@@', $answerDestination);
                                        $try_hotspot = $destination_items[1];
                                        $lp_hotspot = $destination_items[2];
                                        $select_question_hotspot = $destination_items[3];
                                        $url_hotspot = $destination_items[4];
                                    }
                                }
                            } else {
                                // the first delineation feedback
                                if ($debug > 0) {
                                    error_log(__LINE__.' first', 0);
                                }
                            }
                            break;
                        case HOT_SPOT_ORDER:
                            ExerciseShowFunctions::display_hotspot_order_answer(
                                $feedback_type,
                                $answerId,
                                $answer,
                                $studentChoice,
                                $answerComment
                            );
                            break;
                        case DRAGGABLE:
                        case MATCHING_DRAGGABLE:
                        case MATCHING:
                            echo '<tr>';
                            echo Display::tag('td', $answerMatching[$answerId]);
                            echo Display::tag(
                                'td',
                                "$user_answer / ".Display::tag(
                                    'strong',
                                    $answerMatching[$answerCorrect],
                                    ['style' => 'color: #008000; font-weight: bold;']
                                )
                            );
                            echo '</tr>';
                            break;
                        case ANNOTATION:
                            ExerciseShowFunctions::displayAnnotationAnswer(
                                $feedback_type,
                                $exeId,
                                $questionId,
                                $questionScore,
                                $results_disabled
                            );
                            break;
                    }
                }
            }
            if ($debug) {
                error_log(' ------ ');
            }
        } // end for that loops over all answers of the current question

        if ($debug) {
            error_log('-- end answer loop --');
        }

        $final_answer = true;

        foreach ($real_answers as $my_answer) {
            if (!$my_answer) {
                $final_answer = false;
            }
        }

        //we add the total score after dealing with the answers
        if ($answerType == MULTIPLE_ANSWER_COMBINATION ||
            $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE
        ) {
            if ($final_answer) {
                //getting only the first score where we save the weight of all the question
                $answerWeighting = $objAnswerTmp->selectWeighting(1);
                $questionScore += $answerWeighting;
                $totalScore += $answerWeighting;
            }
        }

        //Fixes multiple answer question in order to be exact
        //if ($answerType == MULTIPLE_ANSWER || $answerType == GLOBAL_MULTIPLE_ANSWER) {
        /* if ($answerType == GLOBAL_MULTIPLE_ANSWER) {
             $diff = @array_diff($answer_correct_array, $real_answers);

             // All good answers or nothing works like exact

             $counter = 1;
             $correct_answer = true;
             foreach ($real_answers as $my_answer) {
                 if ($debug)
                     error_log(" my_answer: $my_answer answer_correct_array[counter]: ".$answer_correct_array[$counter]);
                 if ($my_answer != $answer_correct_array[$counter]) {
                     $correct_answer = false;
                     break;
                 }
                 $counter++;
             }

             if ($debug) error_log(" answer_correct_array: ".print_r($answer_correct_array, 1)."");
             if ($debug) error_log(" real_answers: ".print_r($real_answers, 1)."");
             if ($debug) error_log(" correct_answer: ".$correct_answer);

             if ($correct_answer == false) {
                 $questionScore = 0;
             }

             // This makes the result non exact
             if (!empty($diff)) {
                 $questionScore = 0;
             }
         }*/

        $extra_data = [
            'final_overlap' => $final_overlap,
            'final_missing' => $final_missing,
            'final_excess' => $final_excess,
            'overlap_color' => $overlap_color,
            'missing_color' => $missing_color,
            'excess_color' => $excess_color,
            'threadhold1' => $threadhold1,
            'threadhold2' => $threadhold2,
            'threadhold3' => $threadhold3,
        ];

        if ($from == 'exercise_result') {
            // if answer is hotspot. To the difference of exercise_show.php,
            //  we use the results from the session (from_db=0)
            // TODO Change this, because it is wrong to show the user
            //  some results that haven't been stored in the database yet
            if ($answerType == HOT_SPOT || $answerType == HOT_SPOT_ORDER || $answerType == HOT_SPOT_DELINEATION) {
                if ($debug) {
                    error_log('$from AND this is a hotspot kind of question ');
                }
                $my_exe_id = 0;
                $from_database = 0;
                if ($answerType == HOT_SPOT_DELINEATION) {
                    if (0) {
                        if ($overlap_color) {
                            $overlap_color = 'green';
                        } else {
                            $overlap_color = 'red';
                        }
                        if ($missing_color) {
                            $missing_color = 'green';
                        } else {
                            $missing_color = 'red';
                        }
                        if ($excess_color) {
                            $excess_color = 'green';
                        } else {
                            $excess_color = 'red';
                        }
                        if (!is_numeric($final_overlap)) {
                            $final_overlap = 0;
                        }
                        if (!is_numeric($final_missing)) {
                            $final_missing = 0;
                        }
                        if (!is_numeric($final_excess)) {
                            $final_excess = 0;
                        }

                        if ($final_overlap > 100) {
                            $final_overlap = 100;
                        }

                        $table_resume = '<table class="data_table">
                                <tr class="row_odd" >
                                    <td></td>
                                    <td ><b>'.get_lang('Requirements').'</b></td>
                                    <td><b>'.get_lang('YourAnswer').'</b></td>
                                </tr>
                                <tr class="row_even">
                                    <td><b>'.get_lang('Overlap').'</b></td>
                                    <td>'.get_lang('Min').' '.$threadhold1.'</td>
                                    <td><div style="color:'.$overlap_color.'">'
                            .(($final_overlap < 0) ? 0 : intval($final_overlap)).'</div></td>
                                </tr>
                                <tr>
                                    <td><b>'.get_lang('Excess').'</b></td>
                                    <td>'.get_lang('Max').' '.$threadhold2.'</td>
                                    <td><div style="color:'.$excess_color.'">'
                            .(($final_excess < 0) ? 0 : intval($final_excess)).'</div></td>
                                </tr>
                                <tr class="row_even">
                                    <td><b>'.get_lang('Missing').'</b></td>
                                    <td>'.get_lang('Max').' '.$threadhold3.'</td>
                                    <td><div style="color:'.$missing_color.'">'
                            .(($final_missing < 0) ? 0 : intval($final_missing)).'</div></td>
                                </tr>
                            </table>';
                        if ($next == 0) {
                            $try = $try_hotspot;
                            $lp = $lp_hotspot;
                            $destinationid = $select_question_hotspot;
                            $url = $url_hotspot;
                        } else {
                            //show if no error
                            //echo 'no error';
                            $comment = $answerComment = $objAnswerTmp->selectComment($nbrAnswers);
                            $answerDestination = $objAnswerTmp->selectDestination($nbrAnswers);
                        }

                        echo '<h1><div style="color:#333;">'.get_lang('Feedback').'</div></h1>
                            <p style="text-align:center">';

                        $message = '<p>'.get_lang('YourDelineation').'</p>';
                        $message .= $table_resume;
                        $message .= '<br />'.get_lang('ResultIs').' '.$result_comment.'<br />';
                        if ($organs_at_risk_hit > 0) {
                            $message .= '<p><b>'.get_lang('OARHit').'</b></p>';
                        }
                        $message .= '<p>'.$comment.'</p>';
                        echo $message;
                    } else {
                        echo $hotspot_delineation_result[0]; //prints message
                        $from_database = 1; // the hotspot_solution.swf needs this variable
                    }

                    //save the score attempts
                    if (1) {
                        //getting the answer 1 or 0 comes from exercise_submit_modal.php
                        $final_answer = $hotspot_delineation_result[1];
                        if ($final_answer == 0) {
                            $questionScore = 0;
                        }
                        // we always insert the answer_id 1 = delineation
                        Event::saveQuestionAttempt($questionScore, 1, $quesId, $exeId, 0);
                        //in delineation mode, get the answer from $hotspot_delineation_result[1]
                        $hotspotValue = (int) $hotspot_delineation_result[1] === 1 ? 1 : 0;
                        Event::saveExerciseAttemptHotspot(
                            $exeId,
                            $quesId,
                            1,
                            $hotspotValue,
                            $exerciseResultCoordinates[$quesId]
                        );
                    } else {
                        if ($final_answer == 0) {
                            $questionScore = 0;
                            $answer = 0;
                            Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0);
                            if (is_array($exerciseResultCoordinates[$quesId])) {
                                foreach ($exerciseResultCoordinates[$quesId] as $idx => $val) {
                                    Event::saveExerciseAttemptHotspot(
                                        $exeId,
                                        $quesId,
                                        $idx,
                                        0,
                                        $val
                                    );
                                }
                            }
                        } else {
                            Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0);
                            if (is_array($exerciseResultCoordinates[$quesId])) {
                                foreach ($exerciseResultCoordinates[$quesId] as $idx => $val) {
                                    $hotspotValue = (int) $choice[$idx] === 1 ? 1 : 0;
                                    Event::saveExerciseAttemptHotspot(
                                        $exeId,
                                        $quesId,
                                        $idx,
                                        $hotspotValue,
                                        $val
                                    );
                                }
                            }
                        }
                    }
                    $my_exe_id = $exeId;
                }
            }

            $relPath = api_get_path(WEB_CODE_PATH);

            if ($answerType == HOT_SPOT || $answerType == HOT_SPOT_ORDER) {
                // We made an extra table for the answers
                if ($show_result) {
                    echo '</table></td></tr>';
                    echo "
                        <tr>
                            <td colspan=\"2\">
                                <p><em>".get_lang('HotSpot')."</em></p>
                                <div id=\"hotspot-solution-$questionId\"></div>
                                <script>
                                    $(function() {
                                        new HotspotQuestion({
                                            questionId: $questionId,
                                            exerciseId: {$this->id},
                                            exeId: $exeId,
                                            selector: '#hotspot-solution-$questionId',
                                            for: 'solution',
                                            relPath: '$relPath'
                                        });
                                    });
                                </script>
                            </td>
                        </tr>
                    ";
                }
            } elseif ($answerType == ANNOTATION) {
                if ($show_result) {
                    echo '
                        <p><em>'.get_lang('Annotation').'</em></p>
                        <div id="annotation-canvas-'.$questionId.'"></div>
                        <script>
                            AnnotationQuestion({
                                questionId: parseInt('.$questionId.'),
                                exerciseId: parseInt('.$exeId.'),
                                relPath: \''.$relPath.'\',
                                courseId: parseInt('.$course_id.')
                            });
                        </script>
                    ';
                }
            }

            //if ($origin != 'learnpath') {
            if ($show_result && $answerType != ANNOTATION) {
                echo '</table>';
            }
            //	}
        }
        unset($objAnswerTmp);

        $totalWeighting += $questionWeighting;
        // Store results directly in the database
        // For all in one page exercises, the results will be
        // stored by exercise_results.php (using the session)
        if ($saved_results) {
            if ($debug) {
                error_log("Save question results $saved_results");
                error_log('choice: ');
                error_log(print_r($choice, 1));
            }

            if (empty($choice)) {
                $choice = 0;
            }
            // with certainty degree
            if (empty($choiceDegreeCertainty)) {
                $choiceDegreeCertainty = 0;
            }
            if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
                $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE ||
                $answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY
            ) {
                if ($choice != 0) {
                    $reply = array_keys($choice);
                    $countReply = count($reply);
                    for ($i = 0; $i < $countReply; $i++) {
                        $chosenAnswer = $reply[$i];
                        if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY) {
                            if ($choiceDegreeCertainty != 0) {
                                $replyDegreeCertainty = array_keys($choiceDegreeCertainty);
                                $answerDegreeCertainty = isset($replyDegreeCertainty[$i]) ? $replyDegreeCertainty[$i] : '';
                                $answerValue = isset($choiceDegreeCertainty[$answerDegreeCertainty]) ? $choiceDegreeCertainty[$answerDegreeCertainty] : '';
                                Event::saveQuestionAttempt(
                                    $questionScore,
                                    $chosenAnswer.':'.$choice[$chosenAnswer].':'.$answerValue,
                                    $quesId,
                                    $exeId,
                                    $i,
                                    $this->id,
                                    $updateResults
                                );
                            }
                        } else {
                            Event::saveQuestionAttempt(
                                $questionScore,
                                $chosenAnswer.':'.$choice[$chosenAnswer],
                                $quesId,
                                $exeId,
                                $i,
                                $this->id,
                                $updateResults
                            );
                        }
                        if ($debug) {
                            error_log('result =>'.$questionScore.' '.$chosenAnswer.':'.$choice[$chosenAnswer]);
                        }
                    }
                } else {
                    Event::saveQuestionAttempt(
                        $questionScore,
                        0,
                        $quesId,
                        $exeId,
                        0,
                        $this->id
                    );
                }
            } elseif ($answerType == MULTIPLE_ANSWER || $answerType == GLOBAL_MULTIPLE_ANSWER) {
                if ($choice != 0) {
                    $reply = array_keys($choice);

                    if ($debug) {
                        error_log("reply ".print_r($reply, 1)."");
                    }
                    for ($i = 0; $i < sizeof($reply); $i++) {
                        $ans = $reply[$i];
                        Event::saveQuestionAttempt($questionScore, $ans, $quesId, $exeId, $i, $this->id);
                    }
                } else {
                    Event::saveQuestionAttempt($questionScore, 0, $quesId, $exeId, 0, $this->id);
                }
            } elseif ($answerType == MULTIPLE_ANSWER_COMBINATION) {
                if ($choice != 0) {
                    $reply = array_keys($choice);
                    for ($i = 0; $i < sizeof($reply); $i++) {
                        $ans = $reply[$i];
                        Event::saveQuestionAttempt($questionScore, $ans, $quesId, $exeId, $i, $this->id);
                    }
                } else {
                    Event::saveQuestionAttempt(
                        $questionScore,
                        0,
                        $quesId,
                        $exeId,
                        0,
                        $this->id
                    );
                }
            } elseif (in_array($answerType, [MATCHING, DRAGGABLE, MATCHING_DRAGGABLE])) {
                if (isset($matching)) {
                    foreach ($matching as $j => $val) {
                        Event::saveQuestionAttempt(
                            $questionScore,
                            $val,
                            $quesId,
                            $exeId,
                            $j,
                            $this->id
                        );
                    }
                }
            } elseif ($answerType == FREE_ANSWER) {
                $answer = $choice;
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->id
                );
            } elseif ($answerType == ORAL_EXPRESSION) {
                $answer = $choice;
                Event::saveQuestionAttempt(
                    $questionScore,
                    $answer,
                    $quesId,
                    $exeId,
                    0,
                    $this->id,
                    false,
                    $objQuestionTmp->getAbsoluteFilePath()
                );
            } elseif (
                in_array(
                    $answerType,
                    [UNIQUE_ANSWER, UNIQUE_ANSWER_IMAGE, UNIQUE_ANSWER_NO_OPTION, READING_COMPREHENSION]
                )
            ) {
                $answer = $choice;
                Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0, $this->id);
            } elseif ($answerType == HOT_SPOT || $answerType == ANNOTATION) {
                $answer = [];
                if (isset($exerciseResultCoordinates[$questionId]) && !empty($exerciseResultCoordinates[$questionId])) {
                    if ($debug) {
                        error_log('Checking result coordinates');
                    }
                    Database::delete(
                        Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT),
                        [
                            'hotspot_exe_id = ? AND hotspot_question_id = ? AND c_id = ?' => [
                                $exeId,
                                $questionId,
                                api_get_course_int_id(),
                            ],
                        ]
                    );

                    foreach ($exerciseResultCoordinates[$questionId] as $idx => $val) {
                        $answer[] = $val;
                        $hotspotValue = (int) $choice[$idx] === 1 ? 1 : 0;
                        if ($debug) {
                            error_log('Hotspot value: '.$hotspotValue);
                        }
                        Event::saveExerciseAttemptHotspot(
                            $exeId,
                            $quesId,
                            $idx,
                            $hotspotValue,
                            $val,
                            false,
                            $this->id
                        );
                    }
                } else {
                    if ($debug) {
                        error_log('Empty: exerciseResultCoordinates');
                    }
                }
                Event::saveQuestionAttempt($questionScore, implode('|', $answer), $quesId, $exeId, 0, $this->id);
            } else {
                Event::saveQuestionAttempt($questionScore, $answer, $quesId, $exeId, 0, $this->id);
            }
        }

        if ($propagate_neg == 0 && $questionScore < 0) {
            $questionScore = 0;
        }

        if ($saved_results) {
            $statsTable = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
            $sql = "UPDATE $statsTable SET
                        exe_result = exe_result + ".floatval($questionScore)."
                    WHERE exe_id = $exeId";
            Database::query($sql);
            if ($debug) {
                error_log($sql);
            }
        }

        $return = [
            'score' => $questionScore,
            'weight' => $questionWeighting,
            'extra' => $extra_data,
            'open_question' => $arrques,
            'open_answer' => $arrans,
            'answer_type' => $answerType,
            'generated_oral_file' => $generatedFile,
            'user_answered' => $userAnsweredQuestion,
        ];

        return $return;
    }

    /**
     * Sends a notification when a user ends an examn.
     *
     * @param string $type                  'start' or 'end' of an exercise
     * @param array  $question_list_answers
     * @param string $origin
     * @param int    $exe_id
     * @param float  $score
     * @param float  $weight
     *
     * @return bool
     */
    public function send_mail_notification_for_exam(
        $type = 'end',
        $question_list_answers,
        $origin,
        $exe_id,
        $score = null,
        $weight = null
    ) {
        $setting = api_get_course_setting('email_alert_manager_on_new_quiz');

        if (empty($setting) && empty($this->getNotifications())) {
            return false;
        }

        $settingFromExercise = $this->getNotifications();
        if (!empty($settingFromExercise)) {
            $setting = $settingFromExercise;
        }

        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);

        if (empty($courseInfo)) {
            return false;
        }

        $sessionId = api_get_session_id();

        $sessionData = '';
        if (!empty($sessionId)) {
            $sessionInfo = api_get_session_info($sessionId);
            if (!empty($sessionInfo)) {
                $sessionData = '<tr>'
                    .'<td>'.get_lang('SessionName').'</td>'
                    .'<td>'.$sessionInfo['name'].'</td>'
                    .'</tr>';
            }
        }

        $sendStart = false;
        $sendEnd = false;
        $sendEndOpenQuestion = false;
        $sendEndOralQuestion = false;

        foreach ($setting as $option) {
            switch ($option) {
                case 0:
                    return false;
                    break;
                case 1: // End
                    if ($type == 'end') {
                        $sendEnd = true;
                    }
                    break;
                case 2: // start
                    if ($type == 'start') {
                        $sendStart = true;
                    }
                    break;
                case 3: // end + open
                    if ($type == 'end') {
                        $sendEndOpenQuestion = true;
                    }
                    break;
                case 4: // end + oral
                    if ($type == 'end') {
                        $sendEndOralQuestion = true;
                    }
                    break;
            }
        }

        $user_info = api_get_user_info(api_get_user_id());
        $url = api_get_path(WEB_CODE_PATH).'exercise/exercise_show.php?'.
            api_get_cidreq(true, true, 'qualify').'&id='.$exe_id.'&action=qualify';

        if (!empty($sessionId)) {
            $addGeneralCoach = true;
            $setting = api_get_configuration_value('block_quiz_mail_notification_general_coach');
            if ($setting === true) {
                $addGeneralCoach = false;
            }
            $teachers = CourseManager::get_coach_list_from_course_code(
                $courseCode,
                $sessionId,
                $addGeneralCoach
            );
        } else {
            $teachers = CourseManager::get_teacher_list_from_course_code($courseCode);
        }

        if ($sendEndOpenQuestion) {
            $this->sendNotificationForOpenQuestions(
                $question_list_answers,
                $origin,
                $user_info,
                $url,
                $teachers
            );
        }

        if ($sendEndOralQuestion) {
            $this->sendNotificationForOralQuestions(
                $question_list_answers,
                $origin,
                $exe_id,
                $user_info,
                $url,
                $teachers
            );
        }

        if (!$sendEnd && !$sendStart) {
            return false;
        }

        $scoreLabel = '';
        if ($sendEnd &&
            api_get_configuration_value('send_score_in_exam_notification_mail_to_manager') == true
        ) {
            $notificationPercentage = api_get_configuration_value('send_notification_score_in_percentage');
            $scoreLabel = ExerciseLib::show_score($score, $weight, $notificationPercentage, true);
            $scoreLabel = "<tr>
                            <td>".get_lang('Score')."</td>
                            <td>&nbsp;$scoreLabel</td>
                        </tr>";
        }

        if ($sendEnd) {
            $msg = get_lang('ExerciseAttempted').'<br /><br />';
        } else {
            $msg = get_lang('StudentStartExercise').'<br /><br />';
        }

        $msg .= get_lang('AttemptDetails').' : <br /><br />
                    <table>
                        <tr>
                            <td>'.get_lang('CourseName').'</td>
                            <td>#course#</td>
                        </tr>
                        '.$sessionData.'
                        <tr>
                            <td>'.get_lang('Exercise').'</td>
                            <td>&nbsp;#exercise#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentName').'</td>
                            <td>&nbsp;#student_complete_name#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentEmail').'</td>
                            <td>&nbsp;#email#</td>
                        </tr>
                        '.$scoreLabel.'
                    </table>';

        $variables = [
            '#email#' => $user_info['email'],
            '#exercise#' => $this->exercise,
            '#student_complete_name#' => $user_info['complete_name'],
            '#course#' => Display::url(
                $courseInfo['title'],
                $courseInfo['course_public_url'].'?id_session='.$sessionId
            ),
        ];

        if ($sendEnd) {
            $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            $variables['#url#'] = $url;
        }

        $content = str_replace(array_keys($variables), array_values($variables), $msg);

        if ($sendEnd) {
            $subject = get_lang('ExerciseAttempted');
        } else {
            $subject = get_lang('StudentStartExercise');
        }

        if (!empty($teachers)) {
            foreach ($teachers as $user_id => $teacher_data) {
                MessageManager::send_message_simple(
                    $user_id,
                    $subject,
                    $content
                );
            }
        }
    }

    /**
     * @param array $user_data         result of api_get_user_info()
     * @param array $trackExerciseInfo result of get_stat_track_exercise_info
     *
     * @return string
     */
    public function showExerciseResultHeader(
        $user_data,
        $trackExerciseInfo
    ) {
        if (api_get_configuration_value('hide_user_info_in_quiz_result')) {
            return '';
        }

        $start_date = null;

        if (isset($trackExerciseInfo['start_date'])) {
            $start_date = api_convert_and_format_date($trackExerciseInfo['start_date']);
        }
        $duration = isset($trackExerciseInfo['duration_formatted']) ? $trackExerciseInfo['duration_formatted'] : null;
        $ip = isset($trackExerciseInfo['user_ip']) ? $trackExerciseInfo['user_ip'] : null;

        if (!empty($user_data)) {
            $userFullName = $user_data['complete_name'];
            if (api_is_teacher() || api_is_platform_admin(true, true)) {
                $userFullName = '<a href="'.$user_data['profile_url'].'" title="'.get_lang('GoToStudentDetails').'">'.
                    $user_data['complete_name'].'</a>';
            }

            $data = [
                'name_url' => $userFullName,
                'complete_name' => $user_data['complete_name'],
                'username' => $user_data['username'],
                'avatar' => $user_data['avatar_medium'],
                'url' => $user_data['profile_url'],
            ];

            if (!empty($user_data['official_code'])) {
                $data['code'] = $user_data['official_code'];
            }
        }
        // Description can be very long and is generally meant to explain
        //   rules *before* the exam. Leaving here to make display easier if
        //   necessary
        /*
        if (!empty($this->description)) {
            $array[] = array('title' => get_lang("Description"), 'content' => $this->description);
        }
        */
        if (!empty($start_date)) {
            $data['start_date'] = $start_date;
        }

        if (!empty($duration)) {
            $data['duration'] = $duration;
        }

        if (!empty($ip)) {
            $data['ip'] = $ip;
        }

        if (api_get_configuration_value('save_titles_as_html')) {
            $data['title'] = $this->get_formated_title().get_lang('Result');
        } else {
            $data['title'] = PHP_EOL.$this->exercise.' : '.get_lang('Result');
        }

        $tpl = new Template(null, false, false, false, false, false, false);
        $tpl->assign('data', $data);
        $layoutTemplate = $tpl->get_template('exercise/partials/result_exercise.tpl');
        $content = $tpl->fetch($layoutTemplate);

        return $content;
    }

    /**
     * Returns the exercise result.
     *
     * @param 	int		attempt id
     *
     * @return array
     */
    public function get_exercise_result($exe_id)
    {
        $result = [];
        $track_exercise_info = ExerciseLib::get_exercise_track_exercise_info($exe_id);

        if (!empty($track_exercise_info)) {
            $totalScore = 0;
            $objExercise = new Exercise();
            $objExercise->read($track_exercise_info['exe_exo_id']);
            if (!empty($track_exercise_info['data_tracking'])) {
                $question_list = explode(',', $track_exercise_info['data_tracking']);
            }
            foreach ($question_list as $questionId) {
                $question_result = $objExercise->manage_answer(
                    $exe_id,
                    $questionId,
                    '',
                    'exercise_show',
                    [],
                    false,
                    true,
                    false,
                    $objExercise->selectPropagateNeg()
                );
                $totalScore += $question_result['score'];
            }

            if ($objExercise->selectPropagateNeg() == 0 && $totalScore < 0) {
                $totalScore = 0;
            }
            $result = [
                'score' => $totalScore,
                'weight' => $track_exercise_info['exe_weighting'],
            ];
        }

        return $result;
    }

    /**
     * Checks if the exercise is visible due a lot of conditions
     * visibility, time limits, student attempts
     * Return associative array
     * value : true if exercise visible
     * message : HTML formatted message
     * rawMessage : text message.
     *
     * @param int  $lpId
     * @param int  $lpItemId
     * @param int  $lpItemViewId
     * @param bool $filterByAdmin
     *
     * @return array
     */
    public function is_visible(
        $lpId = 0,
        $lpItemId = 0,
        $lpItemViewId = 0,
        $filterByAdmin = true
    ) {
        // 1. By default the exercise is visible
        $isVisible = true;
        $message = null;

        // 1.1 Admins and teachers can access to the exercise
        if ($filterByAdmin) {
            if (api_is_platform_admin() || api_is_course_admin()) {
                return ['value' => true, 'message' => ''];
            }
        }

        // Deleted exercise.
        if ($this->active == -1) {
            return [
                'value' => false,
                'message' => Display::return_message(
                    get_lang('ExerciseNotFound'),
                    'warning',
                    false
                ),
                'rawMessage' => get_lang('ExerciseNotFound'),
            ];
        }

        // Checking visibility in the item_property table.
        $visibility = api_get_item_visibility(
            api_get_course_info(),
            TOOL_QUIZ,
            $this->id,
            api_get_session_id()
        );

        if ($visibility == 0 || $visibility == 2) {
            $this->active = 0;
        }

        // 2. If the exercise is not active.
        if (empty($lpId)) {
            // 2.1 LP is OFF
            if ($this->active == 0) {
                return [
                    'value' => false,
                    'message' => Display::return_message(
                        get_lang('ExerciseNotFound'),
                        'warning',
                        false
                    ),
                    'rawMessage' => get_lang('ExerciseNotFound'),
                ];
            }
        } else {
            // 2.1 LP is loaded
            if ($this->active == 0 &&
                !learnpath::is_lp_visible_for_student($lpId, api_get_user_id())
            ) {
                return [
                    'value' => false,
                    'message' => Display::return_message(
                        get_lang('ExerciseNotFound'),
                        'warning',
                        false
                    ),
                    'rawMessage' => get_lang('ExerciseNotFound'),
                ];
            }
        }

        // 3. We check if the time limits are on
        $limitTimeExists = false;
        if (!empty($this->start_time) || !empty($this->end_time)) {
            $limitTimeExists = true;
        }

        if ($limitTimeExists) {
            $timeNow = time();
            $existsStartDate = false;
            $nowIsAfterStartDate = true;
            $existsEndDate = false;
            $nowIsBeforeEndDate = true;

            if (!empty($this->start_time)) {
                $existsStartDate = true;
            }

            if (!empty($this->end_time)) {
                $existsEndDate = true;
            }

            // check if we are before-or-after end-or-start date
            if ($existsStartDate && $timeNow < api_strtotime($this->start_time, 'UTC')) {
                $nowIsAfterStartDate = false;
            }

            if ($existsEndDate & $timeNow >= api_strtotime($this->end_time, 'UTC')) {
                $nowIsBeforeEndDate = false;
            }

            // lets check all cases
            if ($existsStartDate && !$existsEndDate) {
                // exists start date and dont exists end date
                if ($nowIsAfterStartDate) {
                    // after start date, no end date
                    $isVisible = true;
                    $message = sprintf(
                        get_lang('ExerciseAvailableSinceX'),
                        api_convert_and_format_date($this->start_time)
                    );
                } else {
                    // before start date, no end date
                    $isVisible = false;
                    $message = sprintf(
                        get_lang('ExerciseAvailableFromX'),
                        api_convert_and_format_date($this->start_time)
                    );
                }
            } elseif (!$existsStartDate && $existsEndDate) {
                // doesnt exist start date, exists end date
                if ($nowIsBeforeEndDate) {
                    // before end date, no start date
                    $isVisible = true;
                    $message = sprintf(
                        get_lang('ExerciseAvailableUntilX'),
                        api_convert_and_format_date($this->end_time)
                    );
                } else {
                    // after end date, no start date
                    $isVisible = false;
                    $message = sprintf(
                        get_lang('ExerciseAvailableUntilX'),
                        api_convert_and_format_date($this->end_time)
                    );
                }
            } elseif ($existsStartDate && $existsEndDate) {
                // exists start date and end date
                if ($nowIsAfterStartDate) {
                    if ($nowIsBeforeEndDate) {
                        // after start date and before end date
                        $isVisible = true;
                        $message = sprintf(
                            get_lang('ExerciseIsActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    } else {
                        // after start date and after end date
                        $isVisible = false;
                        $message = sprintf(
                            get_lang('ExerciseWasActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    }
                } else {
                    if ($nowIsBeforeEndDate) {
                        // before start date and before end date
                        $isVisible = false;
                        $message = sprintf(
                            get_lang('ExerciseWillBeActivatedFromXToY'),
                            api_convert_and_format_date($this->start_time),
                            api_convert_and_format_date($this->end_time)
                        );
                    }
                    // case before start date and after end date is impossible
                }
            } elseif (!$existsStartDate && !$existsEndDate) {
                // doesnt exist start date nor end date
                $isVisible = true;
                $message = '';
            }
        }

        // 4. We check if the student have attempts
        if ($isVisible) {
            $exerciseAttempts = $this->selectAttempts();

            if ($exerciseAttempts > 0) {
                $attemptCount = Event::get_attempt_count_not_finished(
                    api_get_user_id(),
                    $this->id,
                    $lpId,
                    $lpItemId,
                    $lpItemViewId
                );

                if ($attemptCount >= $exerciseAttempts) {
                    $message = sprintf(
                        get_lang('ReachedMaxAttempts'),
                        $this->name,
                        $exerciseAttempts
                    );
                    $isVisible = false;
                }
            }
        }

        $rawMessage = '';
        if (!empty($message)) {
            $rawMessage = $message;
            $message = Display::return_message($message, 'warning', false);
        }

        return [
            'value' => $isVisible,
            'message' => $message,
            'rawMessage' => $rawMessage,
        ];
    }

    /**
     * @return bool
     */
    public function added_in_lp()
    {
        $TBL_LP_ITEM = Database::get_course_table(TABLE_LP_ITEM);
        $sql = "SELECT max_score FROM $TBL_LP_ITEM
                WHERE 
                    c_id = {$this->course_id} AND 
                    item_type = '".TOOL_QUIZ."' AND 
                    path = '{$this->id}'";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            return true;
        }

        return false;
    }

    /**
     * Returns an array with this form.
     *
     * @example
     * <code>
     * array (size=3)
     * 999 =>
     * array (size=3)
     * 0 => int 3422
     * 1 => int 3423
     * 2 => int 3424
     * 100 =>
     * array (size=2)
     * 0 => int 3469
     * 1 => int 3470
     * 101 =>
     * array (size=1)
     * 0 => int 3482
     * </code>
     * The array inside the key 999 means the question list that belongs to the media id = 999,
     * this case is special because 999 means "no media".
     *
     * @return array
     */
    public function getMediaList()
    {
        return $this->mediaList;
    }

    /**
     * Is media question activated?
     *
     * @return bool
     */
    public function mediaIsActivated()
    {
        $mediaQuestions = $this->getMediaList();
        $active = false;
        if (isset($mediaQuestions) && !empty($mediaQuestions)) {
            $media_count = count($mediaQuestions);
            if ($media_count > 1) {
                return true;
            } elseif ($media_count == 1) {
                if (isset($mediaQuestions[999])) {
                    return false;
                } else {
                    return true;
                }
            }
        }

        return $active;
    }

    /**
     * Gets question list from the exercise.
     *
     * @return array
     */
    public function getQuestionList()
    {
        return $this->questionList;
    }

    /**
     * Question list with medias compressed like this.
     *
     * @example
     * <code>
     * array(
     *      question_id_1,
     *      question_id_2,
     *      media_id, <- this media id contains question ids
     *      question_id_3,
     * )
     * </code>
     *
     * @return array
     */
    public function getQuestionListWithMediasCompressed()
    {
        return $this->questionList;
    }

    /**
     * Question list with medias uncompressed like this.
     *
     * @example
     * <code>
     * array(
     *      question_id,
     *      question_id,
     *      question_id, <- belongs to a media id
     *      question_id, <- belongs to a media id
     *      question_id,
     * )
     * </code>
     *
     * @return array
     */
    public function getQuestionListWithMediasUncompressed()
    {
        return $this->questionListUncompressed;
    }

    /**
     * Sets the question list when the exercise->read() is executed.
     *
     * @param bool $adminView Whether to view the set the list of *all* questions or just the normal student view
     */
    public function setQuestionList($adminView = false)
    {
        // Getting question list.
        $questionList = $this->selectQuestionList(true, $adminView);
        $this->setMediaList($questionList);
        $this->questionList = $this->transformQuestionListWithMedias(
            $questionList,
            false
        );
        $this->questionListUncompressed = $this->transformQuestionListWithMedias(
            $questionList,
            true
        );
    }

    /**
     * @params array question list
     * @params bool expand or not question list (true show all questions,
     * false show media question id instead of the question ids)
     */
    public function transformQuestionListWithMedias(
        $question_list,
        $expand_media_questions = false
    ) {
        $new_question_list = [];
        if (!empty($question_list)) {
            $media_questions = $this->getMediaList();
            $media_active = $this->mediaIsActivated($media_questions);

            if ($media_active) {
                $counter = 1;
                foreach ($question_list as $question_id) {
                    $add_question = true;
                    foreach ($media_questions as $media_id => $question_list_in_media) {
                        if ($media_id != 999 && in_array($question_id, $question_list_in_media)) {
                            $add_question = false;
                            if (!in_array($media_id, $new_question_list)) {
                                $new_question_list[$counter] = $media_id;
                                $counter++;
                            }
                            break;
                        }
                    }
                    if ($add_question) {
                        $new_question_list[$counter] = $question_id;
                        $counter++;
                    }
                }
                if ($expand_media_questions) {
                    $media_key_list = array_keys($media_questions);
                    foreach ($new_question_list as &$question_id) {
                        if (in_array($question_id, $media_key_list)) {
                            $question_id = $media_questions[$question_id];
                        }
                    }
                    $new_question_list = array_flatten($new_question_list);
                }
            } else {
                $new_question_list = $question_list;
            }
        }

        return $new_question_list;
    }

    /**
     * Get question list depend on the random settings.
     *
     * @return array
     */
    public function get_validated_question_list()
    {
        $isRandomByCategory = $this->isRandomByCat();
        if ($isRandomByCategory == 0) {
            if ($this->isRandom()) {
                return $this->getRandomList();
            }

            return $this->selectQuestionList();
        }

        if ($this->isRandom()) {
            // USE question categories
            // get questions by category for this exercise
            // we have to choice $objExercise->random question in each array values of $tabCategoryQuestions
            // key of $tabCategoryQuestions are the categopy id (0 for not in a category)
            // value is the array of question id of this category
            $questionList = [];
            $tabCategoryQuestions = TestCategory::getQuestionsByCat($this->id);
            $isRandomByCategory = $this->getRandomByCategory();
            // We sort categories based on the term between [] in the head
            // of the category's description
            /* examples of categories :
             * [biologie] Maitriser les mecanismes de base de la genetique
             * [biologie] Relier les moyens de depenses et les agents infectieux
             * [biologie] Savoir ou est produite l'enrgie dans les cellules et sous quelle forme
             * [chimie] Classer les molles suivant leur pouvoir oxydant ou reacteur
             * [chimie] Connaître la denition de la theoie acide/base selon Brönsted
             * [chimie] Connaître les charges des particules
             * We want that in the order of the groups defined by the term
             * between brackets at the beginning of the category title
            */
            // If test option is Grouped By Categories
            if ($isRandomByCategory == 2) {
                $tabCategoryQuestions = TestCategory::sortTabByBracketLabel($tabCategoryQuestions);
            }
            foreach ($tabCategoryQuestions as $tabquestion) {
                $number_of_random_question = $this->random;
                if ($this->random == -1) {
                    $number_of_random_question = count($this->questionList);
                }
                $questionList = array_merge(
                    $questionList,
                    TestCategory::getNElementsFromArray(
                        $tabquestion,
                        $number_of_random_question
                    )
                );
            }
            // shuffle the question list if test is not grouped by categories
            if ($isRandomByCategory == 1) {
                shuffle($questionList); // or not
            }

            return $questionList;
        }

        // Problem, random by category has been selected and
        // we have no $this->isRandom number of question selected
        // Should not happened

        return [];
    }

    public function get_question_list($expand_media_questions = false)
    {
        $question_list = $this->get_validated_question_list();
        $question_list = $this->transform_question_list_with_medias($question_list, $expand_media_questions);

        return $question_list;
    }

    public function transform_question_list_with_medias($question_list, $expand_media_questions = false)
    {
        $new_question_list = [];
        if (!empty($question_list)) {
            $media_questions = $this->getMediaList();
            $media_active = $this->mediaIsActivated($media_questions);

            if ($media_active) {
                $counter = 1;
                foreach ($question_list as $question_id) {
                    $add_question = true;
                    foreach ($media_questions as $media_id => $question_list_in_media) {
                        if ($media_id != 999 && in_array($question_id, $question_list_in_media)) {
                            $add_question = false;
                            if (!in_array($media_id, $new_question_list)) {
                                $new_question_list[$counter] = $media_id;
                                $counter++;
                            }
                            break;
                        }
                    }
                    if ($add_question) {
                        $new_question_list[$counter] = $question_id;
                        $counter++;
                    }
                }
                if ($expand_media_questions) {
                    $media_key_list = array_keys($media_questions);
                    foreach ($new_question_list as &$question_id) {
                        if (in_array($question_id, $media_key_list)) {
                            $question_id = $media_questions[$question_id];
                        }
                    }
                    $new_question_list = array_flatten($new_question_list);
                }
            } else {
                $new_question_list = $question_list;
            }
        }

        return $new_question_list;
    }

    /**
     * @param int $exe_id
     *
     * @return array
     */
    public function get_stat_track_exercise_info_by_exe_id($exe_id)
    {
        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $exe_id = (int) $exe_id;
        $sql_track = "SELECT * FROM $table WHERE exe_id = $exe_id ";
        $result = Database::query($sql_track);
        $new_array = [];
        if (Database::num_rows($result) > 0) {
            $new_array = Database::fetch_array($result, 'ASSOC');
            $start_date = api_get_utc_datetime($new_array['start_date'], true);
            $end_date = api_get_utc_datetime($new_array['exe_date'], true);
            $new_array['duration_formatted'] = '';
            if (!empty($new_array['exe_duration']) && !empty($start_date) && !empty($end_date)) {
                $time = api_format_time($new_array['exe_duration'], 'js');
                $new_array['duration_formatted'] = $time;
            }
        }

        return $new_array;
    }

    /**
     * @param int $exeId
     *
     * @return bool
     */
    public function removeAllQuestionToRemind($exeId)
    {
        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $exeId = (int) $exeId;
        if (empty($exeId)) {
            return false;
        }
        $sql = "UPDATE $table 
                SET questions_to_check = '' 
                WHERE exe_id = $exeId ";
        Database::query($sql);

        return true;
    }

    /**
     * @param int   $exeId
     * @param array $questionList
     *
     * @return bool
     */
    public function addAllQuestionToRemind($exeId, $questionList = [])
    {
        $exeId = (int) $exeId;
        if (empty($questionList)) {
            return false;
        }

        $questionListToString = implode(',', $questionList);
        $questionListToString = Database::escape_string($questionListToString);

        $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        $sql = "UPDATE $table 
                SET questions_to_check = '$questionListToString' 
                WHERE exe_id = $exeId";
        Database::query($sql);

        return true;
    }

    /**
     * @param int    $exe_id
     * @param int    $question_id
     * @param string $action
     */
    public function editQuestionToRemind($exe_id, $question_id, $action = 'add')
    {
        $exercise_info = self::get_stat_track_exercise_info_by_exe_id($exe_id);
        $question_id = (int) $question_id;
        $exe_id = (int) $exe_id;
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        if ($exercise_info) {
            if (empty($exercise_info['questions_to_check'])) {
                if ($action == 'add') {
                    $sql = "UPDATE $track_exercises 
                            SET questions_to_check = '$question_id' 
                            WHERE exe_id = $exe_id ";
                    Database::query($sql);
                }
            } else {
                $remind_list = explode(',', $exercise_info['questions_to_check']);
                $remind_list_string = '';
                if ($action == 'add') {
                    if (!in_array($question_id, $remind_list)) {
                        $newRemindList = [];
                        $remind_list[] = $question_id;
                        $questionListInSession = Session::read('questionList');
                        if (!empty($questionListInSession)) {
                            foreach ($questionListInSession as $originalQuestionId) {
                                if (in_array($originalQuestionId, $remind_list)) {
                                    $newRemindList[] = $originalQuestionId;
                                }
                            }
                        }
                        $remind_list_string = implode(',', $newRemindList);
                    }
                } elseif ($action == 'delete') {
                    if (!empty($remind_list)) {
                        if (in_array($question_id, $remind_list)) {
                            $remind_list = array_flip($remind_list);
                            unset($remind_list[$question_id]);
                            $remind_list = array_flip($remind_list);

                            if (!empty($remind_list)) {
                                sort($remind_list);
                                array_filter($remind_list);
                                $remind_list_string = implode(',', $remind_list);
                            }
                        }
                    }
                }
                $value = Database::escape_string($remind_list_string);
                $sql = "UPDATE $track_exercises 
                        SET questions_to_check = '$value' 
                        WHERE exe_id = $exe_id ";
                Database::query($sql);
            }
        }
    }

    /**
     * @param string $answer
     *
     * @return mixed
     */
    public function fill_in_blank_answer_to_array($answer)
    {
        api_preg_match_all('/\[[^]]+\]/', $answer, $teacher_answer_list);
        $teacher_answer_list = $teacher_answer_list[0];

        return $teacher_answer_list;
    }

    /**
     * @param string $answer
     *
     * @return string
     */
    public function fill_in_blank_answer_to_string($answer)
    {
        $teacher_answer_list = $this->fill_in_blank_answer_to_array($answer);
        $result = '';
        if (!empty($teacher_answer_list)) {
            $i = 0;
            foreach ($teacher_answer_list as $teacher_item) {
                $value = null;
                //Cleaning student answer list
                $value = strip_tags($teacher_item);
                $value = api_substr($value, 1, api_strlen($value) - 2);
                $value = explode('/', $value);
                if (!empty($value[0])) {
                    $value = trim($value[0]);
                    $value = str_replace('&nbsp;', '', $value);
                    $result .= $value;
                }
            }
        }

        return $result;
    }

    /**
     * @return string
     */
    public function returnTimeLeftDiv()
    {
        $html = '<div id="clock_warning" style="display:none">';
        $html .= Display::return_message(
            get_lang('ReachedTimeLimit'),
            'warning'
        );
        $html .= ' ';
        $html .= sprintf(
            get_lang('YouWillBeRedirectedInXSeconds'),
            '<span id="counter_to_redirect" class="red_alert"></span>'
        );
        $html .= '</div>';
        $html .= '<div id="exercise_clock_warning" class="count_down"></div>';

        return $html;
    }

    /**
     * Get categories added in the exercise--category matrix.
     *
     * @return array
     */
    public function getCategoriesInExercise()
    {
        $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
        if (!empty($this->id)) {
            $sql = "SELECT * FROM $table
                    WHERE exercise_id = {$this->id} AND c_id = {$this->course_id} ";
            $result = Database::query($sql);
            $list = [];
            if (Database::num_rows($result)) {
                while ($row = Database::fetch_array($result, 'ASSOC')) {
                    $list[$row['category_id']] = $row;
                }

                return $list;
            }
        }

        return [];
    }

    /**
     * Get total number of question that will be parsed when using the category/exercise.
     *
     * @return int
     */
    public function getNumberQuestionExerciseCategory()
    {
        $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
        if (!empty($this->id)) {
            $sql = "SELECT SUM(count_questions) count_questions
                    FROM $table
                    WHERE exercise_id = {$this->id} AND c_id = {$this->course_id}";
            $result = Database::query($sql);
            if (Database::num_rows($result)) {
                $row = Database::fetch_array($result);

                return (int) $row['count_questions'];
            }
        }

        return 0;
    }

    /**
     * Save categories in the TABLE_QUIZ_REL_CATEGORY table.
     *
     * @param array $categories
     */
    public function save_categories_in_exercise($categories)
    {
        if (!empty($categories) && !empty($this->id)) {
            $table = Database::get_course_table(TABLE_QUIZ_REL_CATEGORY);
            $sql = "DELETE FROM $table
                    WHERE exercise_id = {$this->id} AND c_id = {$this->course_id}";
            Database::query($sql);
            if (!empty($categories)) {
                foreach ($categories as $categoryId => $countQuestions) {
                    $params = [
                        'c_id' => $this->course_id,
                        'exercise_id' => $this->id,
                        'category_id' => $categoryId,
                        'count_questions' => $countQuestions,
                    ];
                    Database::insert($table, $params);
                }
            }
        }
    }

    /**
     * @param array  $questionList
     * @param int    $currentQuestion
     * @param array  $conditions
     * @param string $link
     *
     * @return string
     */
    public function progressExercisePaginationBar(
        $questionList,
        $currentQuestion,
        $conditions,
        $link
    ) {
        $mediaQuestions = $this->getMediaList();

        $html = '<div class="exercise_pagination pagination pagination-mini"><ul>';
        $counter = 0;
        $nextValue = 0;
        $wasMedia = false;
        $before = 0;
        $counterNoMedias = 0;
        foreach ($questionList as $questionId) {
            $isCurrent = $currentQuestion == ($counterNoMedias + 1) ? true : false;

            if (!empty($nextValue)) {
                if ($wasMedia) {
                    $nextValue = $nextValue - $before + 1;
                }
            }

            if (isset($mediaQuestions) && isset($mediaQuestions[$questionId])) {
                $fixedValue = $counterNoMedias;

                $html .= Display::progressPaginationBar(
                    $nextValue,
                    $mediaQuestions[$questionId],
                    $currentQuestion,
                    $fixedValue,
                    $conditions,
                    $link,
                    true,
                    true
                );

                $counter += count($mediaQuestions[$questionId]) - 1;
                $before = count($questionList);
                $wasMedia = true;
                $nextValue += count($questionList);
            } else {
                $html .= Display::parsePaginationItem(
                    $questionId,
                    $isCurrent,
                    $conditions,
                    $link,
                    $counter
                );
                $counter++;
                $nextValue++;
                $wasMedia = false;
            }
            $counterNoMedias++;
        }
        $html .= '</ul></div>';

        return $html;
    }

    /**
     *  Shows a list of numbers that represents the question to answer in a exercise.
     *
     * @param array  $categories
     * @param int    $current
     * @param array  $conditions
     * @param string $link
     *
     * @return string
     */
    public function progressExercisePaginationBarWithCategories(
        $categories,
        $current,
        $conditions = [],
        $link = null
    ) {
        $html = null;
        $counterNoMedias = 0;
        $nextValue = 0;
        $wasMedia = false;
        $before = 0;

        if (!empty($categories)) {
            $selectionType = $this->getQuestionSelectionType();
            $useRootAsCategoryTitle = false;

            // Grouping questions per parent category see BT#6540
            if (in_array(
                $selectionType,
                [
                    EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED,
                    EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM,
                ]
            )) {
                $useRootAsCategoryTitle = true;
            }

            // If the exercise is set to only show the titles of the categories
            // at the root of the tree, then pre-order the categories tree by
            // removing children and summing their questions into the parent
            // categories
            if ($useRootAsCategoryTitle) {
                // The new categories list starts empty
                $newCategoryList = [];
                foreach ($categories as $category) {
                    $rootElement = $category['root'];

                    if (isset($category['parent_info'])) {
                        $rootElement = $category['parent_info']['id'];
                    }

                    //$rootElement = $category['id'];
                    // If the current category's ancestor was never seen
                    // before, then declare it and assign the current
                    // category to it.
                    if (!isset($newCategoryList[$rootElement])) {
                        $newCategoryList[$rootElement] = $category;
                    } else {
                        // If it was already seen, then merge the previous with
                        // the current category
                        $oldQuestionList = $newCategoryList[$rootElement]['question_list'];
                        $category['question_list'] = array_merge($oldQuestionList, $category['question_list']);
                        $newCategoryList[$rootElement] = $category;
                    }
                }
                // Now use the newly built categories list, with only parents
                $categories = $newCategoryList;
            }

            foreach ($categories as $category) {
                $questionList = $category['question_list'];
                // Check if in this category there questions added in a media
                $mediaQuestionId = $category['media_question'];
                $isMedia = false;
                $fixedValue = null;

                // Media exists!
                if ($mediaQuestionId != 999) {
                    $isMedia = true;
                    $fixedValue = $counterNoMedias;
                }

                //$categoryName = $category['path']; << show the path
                $categoryName = $category['name'];

                if ($useRootAsCategoryTitle) {
                    if (isset($category['parent_info'])) {
                        $categoryName = $category['parent_info']['title'];
                    }
                }
                $html .= '<div class="row">';
                $html .= '<div class="span2">'.$categoryName.'</div>';
                $html .= '<div class="span8">';

                if (!empty($nextValue)) {
                    if ($wasMedia) {
                        $nextValue = $nextValue - $before + 1;
                    }
                }
                $html .= Display::progressPaginationBar(
                    $nextValue,
                    $questionList,
                    $current,
                    $fixedValue,
                    $conditions,
                    $link,
                    $isMedia,
                    true
                );
                $html .= '</div>';
                $html .= '</div>';

                if ($mediaQuestionId == 999) {
                    $counterNoMedias += count($questionList);
                } else {
                    $counterNoMedias++;
                }

                $nextValue += count($questionList);
                $before = count($questionList);

                if ($mediaQuestionId != 999) {
                    $wasMedia = true;
                } else {
                    $wasMedia = false;
                }
            }
        }

        return $html;
    }

    /**
     * Renders a question list.
     *
     * @param array $questionList    (with media questions compressed)
     * @param int   $currentQuestion
     * @param array $exerciseResult
     * @param array $attemptList
     * @param array $remindList
     */
    public function renderQuestionList(
        $questionList,
        $currentQuestion,
        $exerciseResult,
        $attemptList,
        $remindList
    ) {
        $mediaQuestions = $this->getMediaList();
        $i = 0;

        // Normal question list render (medias compressed)
        foreach ($questionList as $questionId) {
            $i++;
            // For sequential exercises

            if ($this->type == ONE_PER_PAGE) {
                // If it is not the right question, goes to the next loop iteration
                if ($currentQuestion != $i) {
                    continue;
                } else {
                    if (!in_array(
                        $this->getFeedbackType(),
                        [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP]
                    )) {
                        // if the user has already answered this question
                        if (isset($exerciseResult[$questionId])) {
                            echo Display::return_message(
                                get_lang('AlreadyAnswered'),
                                'normal'
                            );
                            break;
                        }
                    }
                }
            }

            // The $questionList contains the media id we check
            // if this questionId is a media question type
            if (isset($mediaQuestions[$questionId]) &&
                $mediaQuestions[$questionId] != 999
            ) {
                // The question belongs to a media
                $mediaQuestionList = $mediaQuestions[$questionId];
                $objQuestionTmp = Question::read($questionId);

                $counter = 1;
                if ($objQuestionTmp->type == MEDIA_QUESTION) {
                    echo $objQuestionTmp->show_media_content();

                    $countQuestionsInsideMedia = count($mediaQuestionList);

                    // Show questions that belongs to a media
                    if (!empty($mediaQuestionList)) {
                        // In order to parse media questions we use letters a, b, c, etc.
                        $letterCounter = 97;
                        foreach ($mediaQuestionList as $questionIdInsideMedia) {
                            $isLastQuestionInMedia = false;
                            if ($counter == $countQuestionsInsideMedia) {
                                $isLastQuestionInMedia = true;
                            }
                            $this->renderQuestion(
                                $questionIdInsideMedia,
                                $attemptList,
                                $remindList,
                                chr($letterCounter),
                                $currentQuestion,
                                $mediaQuestionList,
                                $isLastQuestionInMedia,
                                $questionList
                            );
                            $letterCounter++;
                            $counter++;
                        }
                    }
                } else {
                    $this->renderQuestion(
                        $questionId,
                        $attemptList,
                        $remindList,
                        $i,
                        $currentQuestion,
                        null,
                        null,
                        $questionList
                    );
                    $i++;
                }
            } else {
                // Normal question render.
                $this->renderQuestion(
                    $questionId,
                    $attemptList,
                    $remindList,
                    $i,
                    $currentQuestion,
                    null,
                    null,
                    $questionList
                );
            }

            // For sequential exercises.
            if ($this->type == ONE_PER_PAGE) {
                // quits the loop
                break;
            }
        }
        // end foreach()

        if ($this->type == ALL_ON_ONE_PAGE) {
            $exercise_actions = $this->show_button($questionId, $currentQuestion);
            echo Display::div($exercise_actions, ['class' => 'exercise_actions']);
        }
    }

    /**
     * @param int   $questionId
     * @param array $attemptList
     * @param array $remindList
     * @param int   $i
     * @param int   $current_question
     * @param array $questions_in_media
     * @param bool  $last_question_in_media
     * @param array $realQuestionList
     * @param bool  $generateJS
     */
    public function renderQuestion(
        $questionId,
        $attemptList,
        $remindList,
        $i,
        $current_question,
        $questions_in_media = [],
        $last_question_in_media = false,
        $realQuestionList,
        $generateJS = true
    ) {
        // With this option on the question is loaded via AJAX
        //$generateJS = true;
        //$this->loadQuestionAJAX = true;

        if ($generateJS && $this->loadQuestionAJAX) {
            $url = api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?a=get_question&id='.$questionId.'&'.api_get_cidreq();
            $params = [
                'questionId' => $questionId,
                'attemptList' => $attemptList,
                'remindList' => $remindList,
                'i' => $i,
                'current_question' => $current_question,
                'questions_in_media' => $questions_in_media,
                'last_question_in_media' => $last_question_in_media,
            ];
            $params = json_encode($params);

            $script = '<script>
            $(function(){
                var params = '.$params.';
                $.ajax({
                    type: "GET",
                    async: false,
                    data: params,
                    url: "'.$url.'",
                    success: function(return_value) {
                        $("#ajaxquestiondiv'.$questionId.'").html(return_value);
                    }
                });
            });
            </script>
            <div id="ajaxquestiondiv'.$questionId.'"></div>';
            echo $script;
        } else {
            global $origin;
            $question_obj = Question::read($questionId);
            $user_choice = isset($attemptList[$questionId]) ? $attemptList[$questionId] : null;
            $remind_highlight = null;

            // Hides questions when reviewing a ALL_ON_ONE_PAGE exercise
            // see #4542 no_remind_highlight class hide with jquery
            if ($this->type == ALL_ON_ONE_PAGE && isset($_GET['reminder']) && $_GET['reminder'] == 2) {
                $remind_highlight = 'no_remind_highlight';
                if (in_array($question_obj->type, Question::question_type_no_review())) {
                    return null;
                }
            }

            $attributes = ['id' => 'remind_list['.$questionId.']'];

            // Showing the question
            $exercise_actions = null;
            echo '<a id="questionanchor'.$questionId.'"></a><br />';
            echo '<div id="question_div_'.$questionId.'" class="main_question '.$remind_highlight.'" >';

            // Shows the question + possible answers
            $showTitle = $this->getHideQuestionTitle() == 1 ? false : true;
            echo $this->showQuestion(
                $question_obj,
                false,
                $origin,
                $i,
                $showTitle,
                false,
                $user_choice,
                false,
                null,
                false,
                $this->getModelType(),
                $this->categoryMinusOne
            );

            // Button save and continue
            switch ($this->type) {
                case ONE_PER_PAGE:
                    $exercise_actions .= $this->show_button(
                        $questionId,
                        $current_question,
                        null,
                        $remindList
                    );
                    break;
                case ALL_ON_ONE_PAGE:
                    if (api_is_allowed_to_session_edit()) {
                        $button = [
                            Display::button(
                                'save_now',
                                get_lang('SaveForNow'),
                                ['type' => 'button', 'class' => 'btn btn-primary', 'data-question' => $questionId]
                            ),
                            '<span id="save_for_now_'.$questionId.'" class="exercise_save_mini_message"></span>',
                        ];
                        $exercise_actions .= Display::div(
                            implode(PHP_EOL, $button),
                            ['class' => 'exercise_save_now_button']
                        );
                    }
                    break;
            }

            if (!empty($questions_in_media)) {
                $count_of_questions_inside_media = count($questions_in_media);
                if ($count_of_questions_inside_media > 1 && api_is_allowed_to_session_edit()) {
                    $button = [
                        Display::button(
                            'save_now',
                            get_lang('SaveForNow'),
                            ['type' => 'button', 'class' => 'btn btn-primary', 'data-question' => $questionId]
                        ),
                        '<span id="save_for_now_'.$questionId.'" class="exercise_save_mini_message"></span>&nbsp;',
                    ];
                    $exercise_actions = Display::div(
                        implode(PHP_EOL, $button),
                        ['class' => 'exercise_save_now_button']
                    );
                }

                if ($last_question_in_media && $this->type == ONE_PER_PAGE) {
                    $exercise_actions = $this->show_button($questionId, $current_question, $questions_in_media);
                }
            }

            // Checkbox review answers
            if ($this->review_answers &&
                !in_array($question_obj->type, Question::question_type_no_review())
            ) {
                $remind_question_div = Display::tag(
                    'label',
                    Display::input(
                        'checkbox',
                        'remind_list['.$questionId.']',
                        '',
                        $attributes
                    ).get_lang('ReviewQuestionLater'),
                    [
                        'class' => 'checkbox',
                        'for' => 'remind_list['.$questionId.']',
                    ]
                );
                $exercise_actions .= Display::div(
                    $remind_question_div,
                    ['class' => 'exercise_save_now_button']
                );
            }

            echo Display::div(' ', ['class' => 'clear']);

            $paginationCounter = null;
            if ($this->type == ONE_PER_PAGE) {
                if (empty($questions_in_media)) {
                    $paginationCounter = Display::paginationIndicator(
                        $current_question,
                        count($realQuestionList)
                    );
                } else {
                    if ($last_question_in_media) {
                        $paginationCounter = Display::paginationIndicator(
                            $current_question,
                            count($realQuestionList)
                        );
                    }
                }
            }

            echo '<div class="row"><div class="pull-right">'.$paginationCounter.'</div></div>';
            echo Display::div($exercise_actions, ['class' => 'form-actions']);
            echo '</div>';
        }
    }

    /**
     * Returns an array of categories details for the questions of the current
     * exercise.
     *
     * @return array
     */
    public function getQuestionWithCategories()
    {
        $categoryTable = Database::get_course_table(TABLE_QUIZ_QUESTION_CATEGORY);
        $categoryRelTable = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT DISTINCT cat.*
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON (e.question_id = q.id AND e.c_id = q.c_id)
                INNER JOIN $categoryRelTable catRel
                ON (catRel.question_id = e.question_id AND catRel.c_id = e.c_id)
                INNER JOIN $categoryTable cat
                ON (cat.id = catRel.category_id AND cat.c_id = e.c_id)
                WHERE
                  e.c_id = {$this->course_id} AND
                  e.exercice_id	= ".intval($this->id);

        $result = Database::query($sql);
        $categoriesInExercise = [];
        if (Database::num_rows($result)) {
            $categoriesInExercise = Database::store_result($result, 'ASSOC');
        }

        return $categoriesInExercise;
    }

    /**
     * Calculate the max_score of the quiz, depending of question inside, and quiz advanced option.
     */
    public function get_max_score()
    {
        $out_max_score = 0;
        // list of question's id !!! the array key start at 1 !!!
        $questionList = $this->selectQuestionList(true);

        // test is randomQuestions - see field random of test
        if ($this->random > 0 && $this->randomByCat == 0) {
            $numberRandomQuestions = $this->random;
            $questionScoreList = [];
            foreach ($questionList as $questionId) {
                $tmpobj_question = Question::read($questionId);
                if (is_object($tmpobj_question)) {
                    $questionScoreList[] = $tmpobj_question->weighting;
                }
            }

            rsort($questionScoreList);
            // add the first $numberRandomQuestions value of score array to get max_score
            for ($i = 0; $i < min($numberRandomQuestions, count($questionScoreList)); $i++) {
                $out_max_score += $questionScoreList[$i];
            }
        } elseif ($this->random > 0 && $this->randomByCat > 0) {
            // test is random by category
            // get the $numberRandomQuestions best score question of each category
            $numberRandomQuestions = $this->random;
            $tab_categories_scores = [];
            foreach ($questionList as $questionId) {
                $question_category_id = TestCategory::getCategoryForQuestion($questionId);
                if (!is_array($tab_categories_scores[$question_category_id])) {
                    $tab_categories_scores[$question_category_id] = [];
                }
                $tmpobj_question = Question::read($questionId);
                if (is_object($tmpobj_question)) {
                    $tab_categories_scores[$question_category_id][] = $tmpobj_question->weighting;
                }
            }

            // here we've got an array with first key, the category_id, second key, score of question for this cat
            foreach ($tab_categories_scores as $tab_scores) {
                rsort($tab_scores);
                for ($i = 0; $i < min($numberRandomQuestions, count($tab_scores)); $i++) {
                    $out_max_score += $tab_scores[$i];
                }
            }
        } else {
            // standard test, just add each question score
            foreach ($questionList as $questionId) {
                $question = Question::read($questionId, $this->course);
                $out_max_score += $question->weighting;
            }
        }

        return $out_max_score;
    }

    /**
     * @return string
     */
    public function get_formated_title()
    {
        if (api_get_configuration_value('save_titles_as_html')) {
        }

        return api_html_entity_decode($this->selectTitle());
    }

    /**
     * @param string $title
     *
     * @return string
     */
    public static function get_formated_title_variable($title)
    {
        return api_html_entity_decode($title);
    }

    /**
     * @return string
     */
    public function format_title()
    {
        return api_htmlentities($this->title);
    }

    /**
     * @param string $title
     *
     * @return string
     */
    public static function format_title_variable($title)
    {
        return api_htmlentities($title);
    }

    /**
     * @param int $courseId
     * @param int $sessionId
     *
     * @return array exercises
     */
    public function getExercisesByCourseSession($courseId, $sessionId)
    {
        $courseId = (int) $courseId;
        $sessionId = (int) $sessionId;

        $tbl_quiz = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "SELECT * FROM $tbl_quiz cq
                WHERE
                    cq.c_id = %s AND
                    (cq.session_id = %s OR cq.session_id = 0) AND
                    cq.active = 0
                ORDER BY cq.id";
        $sql = sprintf($sql, $courseId, $sessionId);

        $result = Database::query($sql);

        $rows = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $rows[] = $row;
        }

        return $rows;
    }

    /**
     * @param int   $courseId
     * @param int   $sessionId
     * @param array $quizId
     *
     * @return array exercises
     */
    public function getExerciseAndResult($courseId, $sessionId, $quizId = [])
    {
        if (empty($quizId)) {
            return [];
        }

        $sessionId = (int) $sessionId;
        $courseId = (int) $courseId;

        $ids = is_array($quizId) ? $quizId : [$quizId];
        $ids = array_map('intval', $ids);
        $ids = implode(',', $ids);
        $track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);
        if ($sessionId != 0) {
            $sql = "SELECT * FROM $track_exercises te
              INNER JOIN c_quiz cq ON cq.id = te.exe_exo_id AND te.c_id = cq.c_id
              WHERE
              te.id = %s AND
              te.session_id = %s AND
              cq.id IN (%s)
              ORDER BY cq.id";

            $sql = sprintf($sql, $courseId, $sessionId, $ids);
        } else {
            $sql = "SELECT * FROM $track_exercises te
              INNER JOIN c_quiz cq ON cq.id = te.exe_exo_id AND te.c_id = cq.c_id
              WHERE
              te.id = %s AND
              cq.id IN (%s)
              ORDER BY cq.id";
            $sql = sprintf($sql, $courseId, $ids);
        }
        $result = Database::query($sql);
        $rows = [];
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $rows[] = $row;
        }

        return $rows;
    }

    /**
     * @param $exeId
     * @param $exercise_stat_info
     * @param $remindList
     * @param $currentQuestion
     *
     * @return int|null
     */
    public static function getNextQuestionId(
        $exeId,
        $exercise_stat_info,
        $remindList,
        $currentQuestion
    ) {
        $result = Event::get_exercise_results_by_attempt($exeId, 'incomplete');

        if (isset($result[$exeId])) {
            $result = $result[$exeId];
        } else {
            return null;
        }

        $data_tracking = $exercise_stat_info['data_tracking'];
        $data_tracking = explode(',', $data_tracking);

        // if this is the final question do nothing.
        if ($currentQuestion == count($data_tracking)) {
            return null;
        }

        $currentQuestion = $currentQuestion - 1;

        if (!empty($result['question_list'])) {
            $answeredQuestions = [];
            foreach ($result['question_list'] as $question) {
                if (!empty($question['answer'])) {
                    $answeredQuestions[] = $question['question_id'];
                }
            }

            // Checking answered questions
            $counterAnsweredQuestions = 0;
            foreach ($data_tracking as $questionId) {
                if (!in_array($questionId, $answeredQuestions)) {
                    if ($currentQuestion != $counterAnsweredQuestions) {
                        break;
                    }
                }
                $counterAnsweredQuestions++;
            }

            $counterRemindListQuestions = 0;
            // Checking questions saved in the reminder list
            if (!empty($remindList)) {
                foreach ($data_tracking as $questionId) {
                    if (in_array($questionId, $remindList)) {
                        // Skip the current question
                        if ($currentQuestion != $counterRemindListQuestions) {
                            break;
                        }
                    }
                    $counterRemindListQuestions++;
                }

                if ($counterRemindListQuestions < $currentQuestion) {
                    return null;
                }

                if (!empty($counterRemindListQuestions)) {
                    if ($counterRemindListQuestions > $counterAnsweredQuestions) {
                        return $counterAnsweredQuestions;
                    } else {
                        return $counterRemindListQuestions;
                    }
                }
            }

            return $counterAnsweredQuestions;
        }
    }

    /**
     * Gets the position of a questionId in the question list.
     *
     * @param $questionId
     *
     * @return int
     */
    public function getPositionInCompressedQuestionList($questionId)
    {
        $questionList = $this->getQuestionListWithMediasCompressed();
        $mediaQuestions = $this->getMediaList();
        $position = 1;
        foreach ($questionList as $id) {
            if (isset($mediaQuestions[$id]) && in_array($questionId, $mediaQuestions[$id])) {
                $mediaQuestionList = $mediaQuestions[$id];
                if (in_array($questionId, $mediaQuestionList)) {
                    return $position;
                } else {
                    $position++;
                }
            } else {
                if ($id == $questionId) {
                    return $position;
                } else {
                    $position++;
                }
            }
        }

        return 1;
    }

    /**
     * Get the correct answers in all attempts.
     *
     * @param int  $learnPathId
     * @param int  $learnPathItemId
     * @param bool $onlyCorrect
     *
     * @return array
     */
    public function getAnswersInAllAttempts($learnPathId = 0, $learnPathItemId = 0, $onlyCorrect = true)
    {
        $attempts = Event::getExerciseResultsByUser(
            api_get_user_id(),
            $this->id,
            api_get_course_int_id(),
            api_get_session_id(),
            $learnPathId,
            $learnPathItemId,
            'DESC'
        );

        $list = [];
        foreach ($attempts as $attempt) {
            foreach ($attempt['question_list'] as $answers) {
                foreach ($answers as $answer) {
                    $objAnswer = new Answer($answer['question_id']);
                    if ($onlyCorrect) {
                        switch ($objAnswer->getQuestionType()) {
                            case FILL_IN_BLANKS:
                                $isCorrect = FillBlanks::isCorrect($answer['answer']);
                                break;
                            case MATCHING:
                            case DRAGGABLE:
                            case MATCHING_DRAGGABLE:
                                $isCorrect = Matching::isCorrect(
                                    $answer['position'],
                                    $answer['answer'],
                                    $answer['question_id']
                                );
                                break;
                            case ORAL_EXPRESSION:
                                $isCorrect = false;
                                break;
                            default:
                                $isCorrect = $objAnswer->isCorrectByAutoId($answer['answer']);
                        }
                        if ($isCorrect) {
                            $list[$answer['question_id']][] = $answer;
                        }
                    } else {
                        $list[$answer['question_id']][] = $answer;
                    }
                }
            }

            if ($onlyCorrect === false) {
                // Only take latest attempt
                break;
            }
        }

        return $list;
    }

    /**
     * Get the correct answers in all attempts.
     *
     * @param int $learnPathId
     * @param int $learnPathItemId
     *
     * @return array
     */
    public function getCorrectAnswersInAllAttempts($learnPathId = 0, $learnPathItemId = 0)
    {
        return $this->getAnswersInAllAttempts($learnPathId, $learnPathItemId);
    }

    /**
     * @return bool
     */
    public function showPreviousButton()
    {
        $allow = api_get_configuration_value('allow_quiz_show_previous_button_setting');
        if ($allow === false) {
            return true;
        }

        return $this->showPreviousButton;
    }

    /**
     * @return int
     */
    public function getExerciseCategoryId()
    {
        return (int) $this->exerciseCategoryId;
    }

    /**
     * @param int $value
     */
    public function setExerciseCategoryId($value)
    {
        $this->exerciseCategoryId = (int) $value;
    }

    /**
     * @param array $values
     *
     * @throws \Doctrine\DBAL\DBALException
     */
    public function setPageResultConfiguration($values)
    {
        $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
        if ($pageConfig) {
            $params = [
                'hide_expected_answer' => isset($values['hide_expected_answer']) ? $values['hide_expected_answer'] : '',
                'hide_question_score' => isset($values['hide_question_score']) ? $values['hide_question_score'] : '',
                'hide_total_score' => isset($values['hide_total_score']) ? $values['hide_total_score'] : '',
            ];
            $type = Type::getType('array');
            $platform = Database::getManager()->getConnection()->getDatabasePlatform();
            $this->pageResultConfiguration = $type->convertToDatabaseValue($params, $platform);
        }
    }

    /**
     * @param array $defaults
     */
    public function setPageResultConfigurationDefaults(&$defaults)
    {
        $configuration = $this->getPageResultConfiguration();
        if (!empty($configuration) && !empty($defaults)) {
            $defaults = array_merge($defaults, $configuration);
        }
    }

    /**
     * @return array
     */
    public function getPageResultConfiguration()
    {
        $pageConfig = api_get_configuration_value('allow_quiz_results_page_config');
        if ($pageConfig) {
            /*$params = [
                'hide_expected_answer' => isset($values['hide_expected_answer']) ? $values['hide_expected_answer'] : '',
                'hide_question_score' => isset($values['hide_question_score']) ? $values['hide_question_score'] : '',
                'hide_total_score' => isset($values['hide_total_score']) ? $values['hide_total_score'] : ''
            ];*/
            $type = Type::getType('array');
            $platform = Database::getManager()->getConnection()->getDatabasePlatform();
            $result = $type->convertToPHPValue($this->pageResultConfiguration, $platform);

            return $result;
        }

        return [];
    }

    /**
     * @param string $attribute
     *
     * @return mixed|null
     */
    public function getPageConfigurationAttribute($attribute)
    {
        $result = $this->getPageResultConfiguration();

        if (!empty($result)) {
            $value = isset($result[$attribute]) ? $result[$attribute] : null;

            return $value;
        }

        return null;
    }

    /**
     * @param bool $showPreviousButton
     *
     * @return Exercise
     */
    public function setShowPreviousButton($showPreviousButton)
    {
        $this->showPreviousButton = $showPreviousButton;

        return $this;
    }

    /**
     * @param array $notifications
     */
    public function setNotifications($notifications)
    {
        $this->notifications = $notifications;
    }

    /**
     * @return array
     */
    public function getNotifications()
    {
        return $this->notifications;
    }

    /**
     * @return bool
     */
    public function showExpectedChoice()
    {
        return api_get_configuration_value('show_exercise_expected_choice');
    }

    /**
     * @return bool
     */
    public function showExpectedChoiceColumn()
    {
        if (!in_array($this->results_disabled, [
            RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
        ])
        ) {
            $hide = (int) $this->getPageConfigurationAttribute('hide_expected_answer');
            if ($hide === 1) {
                return false;
            }

            return true;
        }

        return false;
    }

    /**
     * @param string $class
     * @param string $scoreLabel
     * @param string $result
     * @param array
     *
     * @return string
     */
    public function getQuestionRibbon($class, $scoreLabel, $result, $array)
    {
        $hide = (int) $this->getPageConfigurationAttribute('hide_question_score');
        if ($hide === 1) {
            return '';
        }

        if ($this->showExpectedChoice()) {
            $html = null;
            $hideLabel = api_get_configuration_value('exercise_hide_label');
            $label = '<div class="rib rib-'.$class.'">
                        <h3>'.$scoreLabel.'</h3>
                      </div>';
            if (!empty($result)) {
                $label .= '<h4>'.get_lang('Score').': '.$result.'</h4>';
            }
            if ($hideLabel === true) {
                $answerUsed = (int) $array['used'];
                $answerMissing = (int) $array['missing'] - $answerUsed;
                for ($i = 1; $i <= $answerUsed; $i++) {
                    $html .= '<span class="score-img">'.
                        Display::return_icon('attempt-check.png', null, null, ICON_SIZE_SMALL).
                        '</span>';
                }
                for ($i = 1; $i <= $answerMissing; $i++) {
                    $html .= '<span class="score-img">'.
                        Display::return_icon('attempt-nocheck.png', null, null, ICON_SIZE_SMALL).
                        '</span>';
                }
                $label = '<div class="score-title">'.get_lang('CorrectAnswers').': '.$result.'</div>';
                $label .= '<div class="score-limits">';
                $label .= $html;
                $label .= '</div>';
            }

            return '<div class="ribbon">
                '.$label.'
                </div>'
                ;
        } else {
            $html = '<div class="ribbon">
                        <div class="rib rib-'.$class.'">
                            <h3>'.$scoreLabel.'</h3>
                        </div>';
            if (!empty($result)) {
                $html .= '<h4>'.get_lang('Score').': '.$result.'</h4>';
            }
            $html .= '</div>';

            return $html;
        }
    }

    /**
     * @return int
     */
    public function getAutoLaunch()
    {
        return $this->autolaunch;
    }

    /**
     * Clean auto launch settings for all exercise in course/course-session.
     */
    public function enableAutoLaunch()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET autolaunch = 1
                WHERE iid = ".$this->iId;
        Database::query($sql);
    }

    /**
     * Clean auto launch settings for all exercise in course/course-session.
     */
    public function cleanCourseLaunchSettings()
    {
        $table = Database::get_course_table(TABLE_QUIZ_TEST);
        $sql = "UPDATE $table SET autolaunch = 0  
                WHERE c_id = ".$this->course_id." AND session_id = ".$this->sessionId;
        Database::query($sql);
    }

    /**
     * Get the title without HTML tags.
     *
     * @return string
     */
    public function getUnformattedTitle()
    {
        return strip_tags(api_html_entity_decode($this->title));
    }

    /**
     * @param int $start
     * @param int $length
     *
     * @return array
     */
    public function getQuestionForTeacher($start = 0, $length = 10)
    {
        $start = (int) $start;
        if ($start < 0) {
            $start = 0;
        }

        $length = (int) $length;

        $quizRelQuestion = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $sql = "SELECT DISTINCT e.question_id
                FROM $quizRelQuestion e
                INNER JOIN $question q
                ON (e.question_id = q.iid AND e.c_id = q.c_id)
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = '".$this->id."'
                ORDER BY question_order
                LIMIT $start, $length
            ";
        $result = Database::query($sql);
        $questionList = [];
        while ($object = Database::fetch_object($result)) {
            $questionList[] = $object->question_id;
        }

        return $questionList;
    }

    /**
     * @param int   $exerciseId
     * @param array $courseInfo
     * @param int   $sessionId
     *
     * @throws \Doctrine\ORM\OptimisticLockException
     *
     * @return bool
     */
    public function generateStats($exerciseId, $courseInfo, $sessionId)
    {
        $allowStats = api_get_configuration_value('allow_gradebook_stats');
        if (!$allowStats) {
            return false;
        }

        if (empty($courseInfo)) {
            return false;
        }

        $courseId = $courseInfo['real_id'];

        $sessionId = (int) $sessionId;
        $exerciseId = (int) $exerciseId;

        $result = $this->read($exerciseId);

        if (empty($result)) {
            api_not_allowed(true);
        }

        $statusToFilter = empty($sessionId) ? STUDENT : 0;

        $studentList = CourseManager::get_user_list_from_course_code(
            $courseInfo['code'],
            $sessionId,
            null,
            null,
            $statusToFilter
        );

        if (empty($studentList)) {
            Display::addFlash(Display::return_message(get_lang('NoUsersInCourse')));
            header('Location: '.api_get_path(WEB_CODE_PATH).'exercise/exercise.php?'.api_get_cidreq());
            exit;
        }

        $tblStats = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);

        $studentIdList = [];
        if (!empty($studentList)) {
            $studentIdList = array_column($studentList, 'user_id');
        }

        if ($this->exercise_was_added_in_lp == false) {
            $sql = "SELECT * FROM $tblStats
                        WHERE
                            exe_exo_id = $exerciseId AND
                            orig_lp_id = 0 AND
                            orig_lp_item_id = 0 AND
                            status <> 'incomplete' AND
                            session_id = $sessionId AND
                            c_id = $courseId
                        ";
        } else {
            $lpId = null;
            if (!empty($this->lpList)) {
                // Taking only the first LP
                $lpId = current($this->lpList);
                $lpId = $lpId['lp_id'];
            }

            $sql = "SELECT * 
                        FROM $tblStats
                        WHERE
                            exe_exo_id = $exerciseId AND
                            orig_lp_id = $lpId AND
                            status <> 'incomplete' AND
                            session_id = $sessionId AND
                            c_id = $courseId ";
        }

        $sql .= ' ORDER BY exe_id DESC';

        $studentCount = 0;
        $sum = 0;
        $bestResult = 0;
        $weight = 0;
        $sumResult = 0;
        $result = Database::query($sql);
        while ($data = Database::fetch_array($result, 'ASSOC')) {
            // Only take into account users in the current student list.
            if (!empty($studentIdList)) {
                if (!in_array($data['exe_user_id'], $studentIdList)) {
                    continue;
                }
            }

            if (!isset($students[$data['exe_user_id']])) {
                if ($data['exe_weighting'] != 0) {
                    $students[$data['exe_user_id']] = $data['exe_result'];
                    $studentCount++;
                    if ($data['exe_result'] > $bestResult) {
                        $bestResult = $data['exe_result'];
                    }
                    $sum += $data['exe_result'] / $data['exe_weighting'];
                    $sumResult += $data['exe_result'];
                    $weight = $data['exe_weighting'];
                }
            }
        }

        $count = count($studentList);
        $average = $sumResult / $count;
        $em = Database::getManager();

        $links = AbstractLink::getGradebookLinksFromItem(
            $this->id,
            LINK_EXERCISE,
            $courseInfo['code'],
            $sessionId
        );

        if (empty($links)) {
            $links = AbstractLink::getGradebookLinksFromItem(
                $this->iId,
                LINK_EXERCISE,
                $courseInfo['code'],
                $sessionId
            );
        }

        if (!empty($links)) {
            $repo = $em->getRepository('ChamiloCoreBundle:GradebookLink');

            foreach ($links as $link) {
                $linkId = $link['id'];
                /** @var GradebookLink $exerciseLink */
                $exerciseLink = $repo->find($linkId);
                if ($exerciseLink) {
                    $exerciseLink
                        ->setUserScoreList($students)
                        ->setBestScore($bestResult)
                        ->setAverageScore($average)
                        ->setScoreWeight($this->get_max_score());
                    $em->persist($exerciseLink);
                    $em->flush();
                }
            }
        }
    }

    /**
     * @param int    $categoryId
     * @param int    $page
     * @param int    $from
     * @param int    $limit
     * @param string $keyword
     *
     * @throws \Doctrine\ORM\Query\QueryException
     *
     * @return string
     */
    public static function exerciseGrid($categoryId, $page, $from, $limit, $keyword = '')
    {
        $TBL_DOCUMENT = Database::get_course_table(TABLE_DOCUMENT);
        $TBL_ITEM_PROPERTY = Database::get_course_table(TABLE_ITEM_PROPERTY);
        $TBL_EXERCISE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_EXERCISES = Database::get_course_table(TABLE_QUIZ_TEST);
        $TBL_TRACK_EXERCISES = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCISES);

        $page = (int) $page;
        $from = (int) $from;
        $limit = (int) $limit;

        $autoLaunchAvailable = false;
        if (api_get_course_setting('enable_exercise_auto_launch') == 1 &&
            api_get_configuration_value('allow_exercise_auto_launch')
        ) {
            $autoLaunchAvailable = true;
        }

        $is_allowedToEdit = api_is_allowed_to_edit(null, true);
        $courseInfo = api_get_course_info();
        $sessionId = api_get_session_id();
        $courseId = $courseInfo['real_id'];
        $tableRows = [];
        $uploadPath = DIR_HOTPOTATOES; //defined in main_api
        $exercisePath = api_get_self();
        $origin = api_get_origin();
        $userInfo = api_get_user_info();
        $charset = 'utf-8';
        $token = Security::get_token();
        $userId = api_get_user_id();
        $isDrhOfCourse = CourseManager::isUserSubscribedInCourseAsDrh(
            $userId,
            $courseInfo
        );
        $documentPath = api_get_path(SYS_COURSE_PATH).$courseInfo['path'].'/document';
        $limitTeacherAccess = api_get_configuration_value('limit_exercise_teacher_access');

        $learnpath_id = isset($_REQUEST['learnpath_id']) ? (int) $_REQUEST['learnpath_id'] : null;
        $learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? (int) $_REQUEST['learnpath_item_id'] : null;

        // Condition for the session
        $condition_session = api_get_session_condition($sessionId, true, true);
        $content = '';

        $categoryCondition = '';
        $categoryId = (int) $categoryId;
        if (api_get_configuration_value('allow_exercise_categories')) {
            $categoryCondition = " AND exercise_category_id = $categoryId ";
        }

        $keywordCondition = '';
        if (!empty($keyword)) {
            $keyword = Database::escape_string($keyword);
            $keywordCondition = " AND title LIKE '%$keyword%' ";
        }

        // Only for administrators
        if ($is_allowedToEdit) {
            $total_sql = "SELECT count(iid) as count 
                          FROM $TBL_EXERCISES
                          WHERE 
                                c_id = $courseId AND 
                                active<>'-1' 
                                $condition_session 
                                $categoryCondition
                                $keywordCondition
                                ";
            $sql = "SELECT * FROM $TBL_EXERCISES
                    WHERE 
                        c_id = $courseId AND 
                        active <> '-1' 
                        $condition_session 
                        $categoryCondition
                        $keywordCondition
                    ORDER BY title
                    LIMIT $from , $limit";
        } else {
            // Only for students
            $total_sql = "SELECT count(iid) as count 
                          FROM $TBL_EXERCISES
                          WHERE 
                                c_id = $courseId AND 
                                active = '1' 
                                $condition_session 
                                $categoryCondition
                                $keywordCondition
                          ";
            $sql = "SELECT * FROM $TBL_EXERCISES
                    WHERE c_id = $courseId AND
                          active='1' $condition_session
                          $categoryCondition
                          $keywordCondition
                    ORDER BY title LIMIT $from , $limit";
        }
        $result = Database::query($sql);
        $result_total = Database::query($total_sql);

        $total_exercises = 0;
        if (Database :: num_rows($result_total)) {
            $result_total = Database::fetch_array($result_total);
            $total_exercises = $result_total['count'];
        }

        //get HotPotatoes files (active and inactive)
        if ($is_allowedToEdit) {
            $sql = "SELECT * FROM $TBL_DOCUMENT
                    WHERE
                        c_id = $courseId AND
                        path LIKE '".Database::escape_string($uploadPath.'/%/%')."'";
            $res = Database::query($sql);
            $hp_count = Database :: num_rows($res);
        } else {
            $sql = "SELECT * FROM $TBL_DOCUMENT d 
                    INNER JOIN $TBL_ITEM_PROPERTY ip
                    ON (d.id = ip.ref AND d.c_id = ip.c_id) 
                    WHERE                
                        ip.tool = '".TOOL_DOCUMENT."' AND
                        d.path LIKE '".Database::escape_string($uploadPath.'/%/%')."' AND
                        ip.visibility ='1' AND
                        d.c_id = $courseId AND
                        ip.c_id  = $courseId";
            $res = Database::query($sql);
            $hp_count = Database::num_rows($res);
        }

        $total = $total_exercises + $hp_count;
        $exerciseList = [];
        $list_ordered = null;
        while ($row = Database::fetch_array($result, 'ASSOC')) {
            $exerciseList[$row['iid']] = $row;
        }

        if (!empty($exerciseList) &&
            api_get_setting('exercise_invisible_in_session') === 'true'
        ) {
            if (!empty($sessionId)) {
                $changeDefaultVisibility = true;
                if (api_get_setting('configure_exercise_visibility_in_course') === 'true') {
                    $changeDefaultVisibility = false;
                    if (api_get_course_setting('exercise_invisible_in_session') == 1) {
                        $changeDefaultVisibility = true;
                    }
                }

                if ($changeDefaultVisibility) {
                    // Check exercise
                    foreach ($exerciseList as $exercise) {
                        if ($exercise['session_id'] == 0) {
                            $visibilityInfo = api_get_item_property_info(
                                $courseId,
                                TOOL_QUIZ,
                                $exercise['iid'],
                                $sessionId
                            );

                            if (empty($visibilityInfo)) {
                                // Create a record for this
                                api_item_property_update(
                                    $courseInfo,
                                    TOOL_QUIZ,
                                    $exercise['iid'],
                                    'invisible',
                                    api_get_user_id(),
                                    0,
                                    null,
                                    '',
                                    '',
                                    $sessionId
                                );
                            }
                        }
                    }
                }
            }
        }

        if (isset($list_ordered) && !empty($list_ordered)) {
            $new_question_list = [];
            foreach ($list_ordered as $exercise_id) {
                if (isset($exerciseList[$exercise_id])) {
                    $new_question_list[] = $exerciseList[$exercise_id];
                }
            }
            $exerciseList = $new_question_list;
        }

        if (!empty($exerciseList)) {
            if ($origin !== 'learnpath') {
                //avoid sending empty parameters
                $mylpid = empty($learnpath_id) ? '' : '&learnpath_id='.$learnpath_id;
                $mylpitemid = empty($learnpath_item_id) ? '' : '&learnpath_item_id='.$learnpath_item_id;
                foreach ($exerciseList as $row) {
                    $currentRow = [];
                    $my_exercise_id = $row['id'];
                    $attempt_text = '';
                    $actions = '';
                    $exercise = new Exercise();
                    $exercise->read($my_exercise_id, false);

                    if (empty($exercise->id)) {
                        continue;
                    }

                    $locked = $exercise->is_gradebook_locked;
                    // Validation when belongs to a session
                    $session_img = api_get_session_image($row['session_id'], $userInfo['status']);

                    $time_limits = false;
                    if (!empty($row['start_time']) || !empty($row['end_time'])) {
                        $time_limits = true;
                    }

                    $is_actived_time = false;
                    if ($time_limits) {
                        // check if start time
                        $start_time = false;
                        if (!empty($row['start_time'])) {
                            $start_time = api_strtotime($row['start_time'], 'UTC');
                        }
                        $end_time = false;
                        if (!empty($row['end_time'])) {
                            $end_time = api_strtotime($row['end_time'], 'UTC');
                        }
                        $now = time();

                        //If both "clocks" are enable
                        if ($start_time && $end_time) {
                            if ($now > $start_time && $end_time > $now) {
                                $is_actived_time = true;
                            }
                        } else {
                            //we check the start and end
                            if ($start_time) {
                                if ($now > $start_time) {
                                    $is_actived_time = true;
                                }
                            }
                            if ($end_time) {
                                if ($end_time > $now) {
                                    $is_actived_time = true;
                                }
                            }
                        }
                    }

                    // Blocking empty start times see BT#2800
                    global $_custom;
                    if (isset($_custom['exercises_hidden_when_no_start_date']) &&
                        $_custom['exercises_hidden_when_no_start_date']
                    ) {
                        if (empty($row['start_time'])) {
                            $time_limits = true;
                            $is_actived_time = false;
                        }
                    }

                    $cut_title = $exercise->getCutTitle();
                    $alt_title = '';
                    if ($cut_title != $row['title']) {
                        $alt_title = ' title = "'.$exercise->getUnformattedTitle().'" ';
                    }

                    // Teacher only
                    if ($is_allowedToEdit) {
                        $lp_blocked = null;
                        if ($exercise->exercise_was_added_in_lp == true) {
                            $lp_blocked = Display::div(
                                get_lang('AddedToLPCannotBeAccessed'),
                                ['class' => 'lp_content_type_label']
                            );
                        }

                        $visibility = api_get_item_visibility(
                            $courseInfo,
                            TOOL_QUIZ,
                            $my_exercise_id,
                            0
                        );

                        if (!empty($sessionId)) {
                            $setting = api_get_configuration_value('show_hidden_exercise_added_to_lp');
                            if ($setting) {
                                if ($exercise->exercise_was_added_in_lp == false) {
                                    if ($visibility == 0) {
                                        continue;
                                    }
                                }
                            } else {
                                if ($visibility == 0) {
                                    continue;
                                }
                            }

                            $visibility = api_get_item_visibility(
                                $courseInfo,
                                TOOL_QUIZ,
                                $my_exercise_id,
                                $sessionId
                            );
                        }

                        if ($row['active'] == 0 || $visibility == 0) {
                            $title = Display::tag('font', $cut_title, ['style' => 'color:grey']);
                        } else {
                            $title = $cut_title;
                        }

                        $count_exercise_not_validated = (int) Event::count_exercise_result_not_validated(
                            $my_exercise_id,
                            $courseId,
                            $sessionId
                        );

                        /*$move = Display::return_icon(
                            'all_directions.png',
                            get_lang('Move'),
                            ['class' => 'moved', 'style' => 'margin-bottom:-0.5em;']
                        );*/
                        $move = null;
                        $class_tip = '';
                        if (!empty($count_exercise_not_validated)) {
                            $results_text = $count_exercise_not_validated == 1 ? get_lang('ResultNotRevised') : get_lang('ResultsNotRevised');
                            $title .= '<span class="exercise_tooltip" style="display: none;">'.$count_exercise_not_validated.' '.$results_text.' </span>';
                            $class_tip = 'link_tooltip';
                        }

                        $url = $move.'<a '.$alt_title.' class="'.$class_tip.'" id="tooltip_'.$row['id'].'" href="overview.php?'.api_get_cidreq().$mylpid.$mylpitemid.'&exerciseId='.$row['id'].'">
                             '.Display::return_icon('quiz.png', $row['title']).'
                             '.$title.' </a>'.PHP_EOL;

                        if (ExerciseLib::isQuizEmbeddable($row)) {
                            $embeddableIcon = Display::return_icon('om_integration.png', get_lang('ThisQuizCanBeEmbeddable'));
                            $url .= Display::div($embeddableIcon, ['class' => 'pull-right']);
                        }

                        $currentRow['title'] = $url.' '.$session_img.$lp_blocked;

                        // Count number exercise - teacher
                        $sql = "SELECT count(*) count FROM $TBL_EXERCISE_QUESTION
                                WHERE c_id = $courseId AND exercice_id = $my_exercise_id";
                        $sqlresult = Database::query($sql);
                        $rowi = (int) Database::result($sqlresult, 0, 0);

                        if ($sessionId == $row['session_id']) {
                            // Questions list
                            $actions = Display::url(
                                Display::return_icon('edit.png', get_lang('Edit'), '', ICON_SIZE_SMALL),
                                'admin.php?'.api_get_cidreq().'&exerciseId='.$row['id']
                            );

                            // Test settings
                            $settings = Display::url(
                                Display::return_icon('settings.png', get_lang('Configure'), '', ICON_SIZE_SMALL),
                                'exercise_admin.php?'.api_get_cidreq().'&exerciseId='.$row['id']
                            );

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $settings = '';
                            }
                            $actions .= $settings;

                            // Exercise results
                            $resultsLink = '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['id'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';

                            if ($limitTeacherAccess) {
                                if (api_is_platform_admin()) {
                                    $actions .= $resultsLink;
                                }
                            } else {
                                // Exercise results
                                $actions .= $resultsLink;
                            }

                            // Auto launch
                            if ($autoLaunchAvailable) {
                                $autoLaunch = $exercise->getAutoLaunch();
                                if (empty($autoLaunch)) {
                                    $actions .= Display::url(
                                        Display::return_icon(
                                            'launch_na.png',
                                            get_lang('Enable'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable_launch&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                } else {
                                    $actions .= Display::url(
                                        Display::return_icon(
                                            'launch.png',
                                            get_lang('Disable'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable_launch&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                }
                            }

                            // Export
                            $actions .= Display::url(
                                Display::return_icon('cd.png', get_lang('CopyExercise')),
                                '',
                                [
                                    'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToCopy'), ENT_QUOTES, $charset))." ".addslashes($row['title'])."?"."')) return false;",
                                    'href' => 'exercise.php?'.api_get_cidreq().'&choice=copy_exercise&sec_token='.$token.'&exerciseId='.$row['id'],
                                ]
                            );

                            // Clean exercise
                            if ($locked == false) {
                                $clean = Display::url(
                                    Display::return_icon(
                                        'clean.png',
                                        get_lang('CleanStudentResults'),
                                        '',
                                        ICON_SIZE_SMALL
                                    ),
                                    '',
                                    [
                                        'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToDeleteResults'), ENT_QUOTES, $charset))." ".addslashes($row['title'])."?"."')) return false;",
                                        'href' => 'exercise.php?'.api_get_cidreq().'&choice=clean_results&sec_token='.$token.'&exerciseId='.$row['id'],
                                    ]
                                );
                            } else {
                                $clean = Display::return_icon(
                                    'clean_na.png',
                                    get_lang('ResourceLockedByGradebook'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            }

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $clean = '';
                            }
                            $actions .= $clean;
                            // Visible / invisible
                            // Check if this exercise was added in a LP
                            if ($exercise->exercise_was_added_in_lp == true) {
                                $visibility = Display::return_icon(
                                    'invisible.png',
                                    get_lang('AddedToLPCannotBeAccessed'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            } else {
                                if ($row['active'] == 0 || $visibility == 0) {
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'invisible.png',
                                            get_lang('Activate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                } else {
                                    // else if not active
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'visible.png',
                                            get_lang('Deactivate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                }
                            }

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $visibility = '';
                            }

                            $actions .= $visibility;

                            // Export qti ...
                            $export = Display::url(
                                Display::return_icon(
                                    'export_qti2.png',
                                    'IMS/QTI',
                                    '',
                                    ICON_SIZE_SMALL
                                ),
                                'exercise.php?action=exportqti2&exerciseId='.$row['id'].'&'.api_get_cidreq()
                            );

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $export = '';
                            }

                            $actions .= $export;
                        } else {
                            // not session
                            $actions = Display::return_icon(
                                'edit_na.png',
                                get_lang('ExerciseEditionNotAvailableInSession')
                            );

                            // Check if this exercise was added in a LP
                            if ($exercise->exercise_was_added_in_lp == true) {
                                $visibility = Display::return_icon(
                                    'invisible.png',
                                    get_lang('AddedToLPCannotBeAccessed'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            } else {
                                if ($row['active'] == 0 || $visibility == 0) {
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'invisible.png',
                                            get_lang('Activate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=enable&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                } else {
                                    // else if not active
                                    $visibility = Display::url(
                                        Display::return_icon(
                                            'visible.png',
                                            get_lang('Deactivate'),
                                            '',
                                            ICON_SIZE_SMALL
                                        ),
                                        'exercise.php?'.api_get_cidreq().'&choice=disable&sec_token='.$token.'&page='.$page.'&exerciseId='.$row['id']
                                    );
                                }
                            }

                            if ($limitTeacherAccess && !api_is_platform_admin()) {
                                $visibility = '';
                            }

                            $actions .= $visibility;
                            $actions .= '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['id'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                            $actions .= Display::url(
                                Display::return_icon('cd.gif', get_lang('CopyExercise')),
                                '',
                                [
                                    'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToCopy'), ENT_QUOTES, $charset))." ".addslashes($row['title'])."?"."')) return false;",
                                    'href' => 'exercise.php?'.api_get_cidreq().'&choice=copy_exercise&sec_token='.$token.'&exerciseId='.$row['id'],
                                ]
                            );
                        }

                        // Delete
                        $delete = '';
                        if ($sessionId == $row['session_id']) {
                            if ($locked == false) {
                                $delete = Display::url(
                                    Display::return_icon(
                                        'delete.png',
                                        get_lang('Delete'),
                                        '',
                                        ICON_SIZE_SMALL
                                    ),
                                    '',
                                    [
                                        'onclick' => "javascript:if(!confirm('".addslashes(api_htmlentities(get_lang('AreYouSureToDeleteJS'), ENT_QUOTES, $charset))." ".addslashes($exercise->getUnformattedTitle())."?"."')) return false;",
                                        'href' => 'exercise.php?'.api_get_cidreq().'&choice=delete&sec_token='.$token.'&exerciseId='.$row['id'],
                                    ]
                                );
                            } else {
                                $delete = Display::return_icon(
                                    'delete_na.png',
                                    get_lang('ResourceLockedByGradebook'),
                                    '',
                                    ICON_SIZE_SMALL
                                );
                            }
                        }

                        if ($limitTeacherAccess && !api_is_platform_admin()) {
                            $delete = '';
                        }

                        $actions .= $delete;

                        // Number of questions
                        $random_label = null;
                        if ($row['random'] > 0 || $row['random'] == -1) {
                            // if random == -1 means use random questions with all questions
                            $random_number_of_question = $row['random'];
                            if ($random_number_of_question == -1) {
                                $random_number_of_question = $rowi;
                            }
                            if ($row['random_by_category'] > 0) {
                                $nbQuestionsTotal = TestCategory::getNumberOfQuestionRandomByCategory(
                                    $my_exercise_id,
                                    $random_number_of_question
                                );
                                $number_of_questions = $nbQuestionsTotal.' ';
                                $number_of_questions .= ($nbQuestionsTotal > 1) ? get_lang('QuestionsLowerCase') : get_lang('QuestionLowerCase');
                                $number_of_questions .= ' - ';
                                $number_of_questions .= min(
                                        TestCategory::getNumberMaxQuestionByCat($my_exercise_id), $random_number_of_question
                                    ).' '.get_lang('QuestionByCategory');
                            } else {
                                $random_label = ' ('.get_lang('Random').') ';
                                $number_of_questions = $random_number_of_question.' '.$random_label.' / '.$rowi;
                                // Bug if we set a random value bigger than the real number of questions
                                if ($random_number_of_question > $rowi) {
                                    $number_of_questions = $rowi.' '.$random_label;
                                }
                            }
                        } else {
                            $number_of_questions = $rowi;
                        }

                        $currentRow['count_questions'] = $number_of_questions;
                    } else {
                        // Student only.
                        $visibility = api_get_item_visibility(
                            $courseInfo,
                            TOOL_QUIZ,
                            $my_exercise_id,
                            $sessionId
                        );

                        if ($visibility == 0) {
                            continue;
                        }

                        $url = '<a '.$alt_title.'  href="overview.php?'.api_get_cidreq().$mylpid.$mylpitemid.'&exerciseId='.$row['id'].'">'.
                            $cut_title.'</a>';

                        // Link of the exercise.
                        $currentRow['title'] = $url.' '.$session_img;

                        // This query might be improved later on by ordering by the new "tms" field rather than by exe_id
                        // Don't remove this marker: note-query-exe-results
                        $sql = "SELECT * FROM $TBL_TRACK_EXERCISES
                                WHERE
                                    exe_exo_id = ".$row['id']." AND
                                    exe_user_id = $userId AND
                                    c_id = ".api_get_course_int_id()." AND
                                    status <> 'incomplete' AND
                                    orig_lp_id = 0 AND
                                    orig_lp_item_id = 0 AND
                                    session_id =  '".api_get_session_id()."'
                                ORDER BY exe_id DESC";

                        $qryres = Database::query($sql);
                        $num = Database :: num_rows($qryres);

                        // Hide the results.
                        $my_result_disabled = $row['results_disabled'];

                        $attempt_text = '-';
                        // Time limits are on
                        if ($time_limits) {
                            // Exam is ready to be taken
                            if ($is_actived_time) {
                                // Show results
                                if (
                                in_array(
                                    $my_result_disabled,
                                    [
                                        RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS,
                                        RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
                                        RESULT_DISABLE_SHOW_SCORE_ONLY,
                                        RESULT_DISABLE_RANKING,
                                    ]
                                )
                                ) {
                                    // More than one attempt
                                    if ($num > 0) {
                                        $row_track = Database :: fetch_array($qryres);
                                        $attempt_text = get_lang('LatestAttempt').' : ';
                                        $attempt_text .= ExerciseLib::show_score(
                                            $row_track['exe_result'],
                                            $row_track['exe_weighting']
                                        );
                                    } else {
                                        //No attempts
                                        $attempt_text = get_lang('NotAttempted');
                                    }
                                } else {
                                    $attempt_text = '-';
                                }
                            } else {
                                // Quiz not ready due to time limits
                                //@todo use the is_visible function
                                if (!empty($row['start_time']) && !empty($row['end_time'])) {
                                    $today = time();
                                    $start_time = api_strtotime($row['start_time'], 'UTC');
                                    $end_time = api_strtotime($row['end_time'], 'UTC');
                                    if ($today < $start_time) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseWillBeActivatedFromXToY'),
                                            api_convert_and_format_date($row['start_time']),
                                            api_convert_and_format_date($row['end_time'])
                                        );
                                    } else {
                                        if ($today > $end_time) {
                                            $attempt_text = sprintf(
                                                get_lang('ExerciseWasActivatedFromXToY'),
                                                api_convert_and_format_date($row['start_time']),
                                                api_convert_and_format_date($row['end_time'])
                                            );
                                        }
                                    }
                                } else {
                                    //$attempt_text = get_lang('ExamNotAvailableAtThisTime');
                                    if (!empty($row['start_time'])) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseAvailableFromX'),
                                            api_convert_and_format_date($row['start_time'])
                                        );
                                    }
                                    if (!empty($row['end_time'])) {
                                        $attempt_text = sprintf(
                                            get_lang('ExerciseAvailableUntilX'),
                                            api_convert_and_format_date($row['end_time'])
                                        );
                                    }
                                }
                            }
                        } else {
                            // Normal behaviour.
                            // Show results.
                            if (
                            in_array(
                                $my_result_disabled,
                                [
                                    RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS,
                                    RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
                                    RESULT_DISABLE_SHOW_SCORE_ONLY,
                                    RESULT_DISABLE_RANKING,
                                ]
                            )
                            ) {
                                if ($num > 0) {
                                    $row_track = Database :: fetch_array($qryres);
                                    $attempt_text = get_lang('LatestAttempt').' : ';
                                    $attempt_text .= ExerciseLib::show_score(
                                        $row_track['exe_result'],
                                        $row_track['exe_weighting']
                                    );
                                } else {
                                    $attempt_text = get_lang('NotAttempted');
                                }
                            }
                        }
                    }

                    $currentRow['attempt'] = $attempt_text;

                    if ($is_allowedToEdit) {
                        $additionalActions = ExerciseLib::getAdditionalTeacherActions($row['id']);

                        if (!empty($additionalActions)) {
                            $actions .= $additionalActions.PHP_EOL;
                        }

                        $currentRow = [
                            $row['iid'],
                            $currentRow['title'],
                            $currentRow['count_questions'],
                            $actions,
                        ];
                    } else {
                        $currentRow = [
                            $currentRow['title'],
                            $currentRow['attempt'],
                        ];

                        if ($isDrhOfCourse) {
                            $currentRow[] = '<a href="exercise_report.php?'.api_get_cidreq().'&exerciseId='.$row['id'].'">'.
                                Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                        }
                    }

                    $tableRows[] = $currentRow;
                }
            }
        }

        // end exercise list
        // Hotpotatoes results
        if ($is_allowedToEdit) {
            $sql = "SELECT d.iid, d.path as path, d.comment as comment
                    FROM $TBL_DOCUMENT d
                    WHERE
                        d.c_id = $courseId AND
                        (d.path LIKE '%htm%') AND
                        d.path  LIKE '".Database :: escape_string($uploadPath.'/%/%')."'
                    LIMIT $from , $limit"; // only .htm or .html files listed
        } else {
            $sql = "SELECT d.iid, d.path as path, d.comment as comment
                    FROM $TBL_DOCUMENT d
                    WHERE
                        d.c_id = $courseId AND
                        (d.path LIKE '%htm%') AND
                        d.path  LIKE '".Database :: escape_string($uploadPath.'/%/%')."'
                    LIMIT $from , $limit";
        }

        $result = Database::query($sql);
        $attributes = [];
        while ($row = Database :: fetch_array($result, 'ASSOC')) {
            $attributes[$row['iid']] = $row;
        }

        $nbrActiveTests = 0;
        if (!empty($attributes)) {
            foreach ($attributes as $item) {
                $id = $item['iid'];
                $path = $item['path'];

                $title = GetQuizName($path, $documentPath);
                if ($title == '') {
                    $title = basename($path);
                }

                // prof only
                if ($is_allowedToEdit) {
                    $visibility = api_get_item_visibility(
                        ['real_id' => $courseId],
                        TOOL_DOCUMENT,
                        $id,
                        0
                    );

                    if (!empty($sessionId)) {
                        if (0 == $visibility) {
                            continue;
                        }

                        $visibility = api_get_item_visibility(
                            ['real_id' => $courseId],
                            TOOL_DOCUMENT,
                            $id,
                            $sessionId
                        );
                    }

                    $title =
                        implode(PHP_EOL, [
                            Display::return_icon('hotpotatoes_s.png', 'HotPotatoes'),
                            Display::url(
                                $title,
                                'showinframes.php?'.api_get_cidreq().'&'.http_build_query([
                                    'file' => $path,
                                    'uid' => $userId,
                                ]),
                                ['class' => $visibility == 0 ? 'text-muted' : null]
                            ),
                        ]);

                    $actions = Display::url(
                        Display::return_icon(
                            'edit.png',
                            get_lang('Edit'),
                            '',
                            ICON_SIZE_SMALL
                        ),
                        'adminhp.php?'.api_get_cidreq().'&hotpotatoesName='.$path
                    );

                    $actions .= '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'">'.
                        Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).
                        '</a>';

                    // if active
                    if ($visibility != 0) {
                        $nbrActiveTests = $nbrActiveTests + 1;
                        $actions .= '      <a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=disable&page='.$page.'&file='.$path.'">'.
                            Display::return_icon('visible.png', get_lang('Deactivate'), '', ICON_SIZE_SMALL).'</a>';
                    } else { // else if not active
                        $actions .= '    <a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=enable&page='.$page.'&file='.$path.'">'.
                            Display::return_icon('invisible.png', get_lang('Activate'), '', ICON_SIZE_SMALL).'</a>';
                    }
                    $actions .= '<a href="'.$exercisePath.'?'.api_get_cidreq().'&hpchoice=delete&file='.$path.'" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('AreYouSureToDeleteJS'), ENT_QUOTES, $charset)).'\')) return false;">'.
                        Display::return_icon('delete.png', get_lang('Delete'), '', ICON_SIZE_SMALL).'</a>';

                    $currentRow = [
                        '',
                        $title,
                        '',
                        $actions,
                    ];
                } else {
                    $visibility = api_get_item_visibility(
                        ['real_id' => $courseId],
                        TOOL_DOCUMENT,
                        $id,
                        $sessionId
                    );

                    if (0 == $visibility) {
                        continue;
                    }

                    // Student only
                    $attempt = ExerciseLib::getLatestHotPotatoResult(
                        $path,
                        $userId,
                        api_get_course_int_id(),
                        api_get_session_id()
                    );

                    $nbrActiveTests = $nbrActiveTests + 1;
                    $title = Display::url(
                        $title,
                        'showinframes.php?'.api_get_cidreq().'&'.http_build_query(
                            [
                                'file' => $path,
                                'cid' => api_get_course_id(),
                                'uid' => $userId,
                            ]
                        )
                    );

                    $actions = '';
                    if (!empty($attempt)) {
                        $actions = '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'&filter_by_user='.$userId.'">'.Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                        $attemptText = get_lang('LatestAttempt').' : ';
                        $attemptText .= ExerciseLib::show_score(
                                $attempt['exe_result'],
                                $attempt['exe_weighting']
                            ).' ';
                        $attemptText .= $actions;
                    } else {
                        // No attempts.
                        $attemptText = get_lang('NotAttempted').' ';
                    }

                    $currentRow = [
                        $title,
                        $attemptText,
                    ];

                    if ($isDrhOfCourse) {
                        $currentRow[] = '<a href="hotpotatoes_exercise_report.php?'.api_get_cidreq().'&path='.$path.'">'.
                            Display::return_icon('test_results.png', get_lang('Results'), '', ICON_SIZE_SMALL).'</a>';
                    }
                }

                $tableRows[] = $currentRow;
            }
        }

        if (empty($tableRows) && empty($categoryId)) {
            if ($is_allowedToEdit && $origin != 'learnpath') {
                $content .= '<div id="no-data-view">';
                $content .= '<h3>'.get_lang('Quiz').'</h3>';
                $content .= Display::return_icon('quiz.png', '', [], 64);
                $content .= '<div class="controls">';
                $content .= Display::url(
                    '<em class="fa fa-plus"></em> '.get_lang('NewEx'),
                    'exercise_admin.php?'.api_get_cidreq(),
                    ['class' => 'btn btn-primary']
                );
                $content .= '</div>';
                $content .= '</div>';
            }
        } else {
            if (empty($tableRows)) {
                return '';
            }
            $table = new SortableTableFromArrayConfig(
                $tableRows,
                0,
                20,
                'exercises_cat'.$categoryId,
                [],
                []
            );

            $table->setTotalNumberOfItems($total);

            $table->set_additional_parameters([
                'cidReq' => api_get_course_id(),
                'id_session' => api_get_session_id(),
                'category_id' => $categoryId,
            ]);

            if ($is_allowedToEdit) {
                $formActions = [];
                $formActions['visible'] = get_lang('Activate');
                $formActions['invisible'] = get_lang('Deactivate');
                $formActions['delete'] = get_lang('Delete');
                $table->set_form_actions($formActions);
            }

            $i = 0;
            if ($is_allowedToEdit) {
                $table->set_header($i++, '', false, 'width="18px"');
            }
            $table->set_header($i++, get_lang('ExerciseName'), false);

            if ($is_allowedToEdit) {
                $table->set_header($i++, get_lang('QuantityQuestions'), false);
                $table->set_header($i++, get_lang('Actions'), false);
            } else {
                $table->set_header($i++, get_lang('Status'), false);
                if ($isDrhOfCourse) {
                    $table->set_header($i++, get_lang('Actions'), false);
                }
            }

            $content .= $table->return_table();
        }

        return $content;
    }

    /**
     * @return int value in minutes
     */
    public function getResultAccess()
    {
        $extraFieldValue = new ExtraFieldValue('exercise');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable(
            $this->iId,
            'results_available_for_x_minutes'
        );

        if (!empty($value) && isset($value['value'])) {
            return (int) $value['value'];
        }

        return 0;
    }

    /**
     * @param array $exerciseResultInfo
     *
     * @return bool
     */
    public function getResultAccessTimeDiff($exerciseResultInfo)
    {
        $value = $this->getResultAccess();
        if (!empty($value)) {
            $endDate = new DateTime($exerciseResultInfo['exe_date'], new DateTimeZone('UTC'));
            $endDate->add(new DateInterval('PT'.$value.'M'));
            $now = time();
            if ($endDate->getTimestamp() > $now) {
                return (int) $endDate->getTimestamp() - $now;
            }
        }

        return 0;
    }

    /**
     * @param array $exerciseResultInfo
     *
     * @return bool
     */
    public function hasResultsAccess($exerciseResultInfo)
    {
        $diff = $this->getResultAccessTimeDiff($exerciseResultInfo);
        if ($diff === 0) {
            return false;
        }

        return true;
    }

    /**
     * @return int
     */
    public function getResultsAccess()
    {
        $extraFieldValue = new ExtraFieldValue('exercise');
        $value = $extraFieldValue->get_values_by_handler_and_field_variable(
            $this->iId,
            'results_available_for_x_minutes'
        );
        if (!empty($value)) {
            return (int) $value;
        }

        return 0;
    }

    /**
     * Gets the question list ordered by the question_order setting (drag and drop).
     *
     * @return array
     */
    private function getQuestionOrderedList()
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);

        // Getting question_order to verify that the question
        // list is correct and all question_order's were set
        $sql = "SELECT DISTINCT count(e.question_order) as count
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON (e.question_id = q.id AND e.c_id = q.c_id)
                WHERE
                  e.c_id = {$this->course_id} AND
                  e.exercice_id	= ".$this->id;

        $result = Database::query($sql);
        $row = Database::fetch_array($result);
        $count_question_orders = $row['count'];

        // Getting question list from the order (question list drag n drop interface).
        $sql = "SELECT DISTINCT e.question_id, e.question_order
                FROM $TBL_EXERCICE_QUESTION e
                INNER JOIN $TBL_QUESTIONS q
                ON (e.question_id = q.id AND e.c_id = q.c_id)
                WHERE
                    e.c_id = {$this->course_id} AND
                    e.exercice_id = '".$this->id."'
                ORDER BY question_order";
        $result = Database::query($sql);

        // Fills the array with the question ID for this exercise
        // the key of the array is the question position
        $temp_question_list = [];
        $counter = 1;
        $questionList = [];
        while ($new_object = Database::fetch_object($result)) {
            // Correct order.
            $questionList[$new_object->question_order] = $new_object->question_id;
            // Just in case we save the order in other array
            $temp_question_list[$counter] = $new_object->question_id;
            $counter++;
        }

        if (!empty($temp_question_list)) {
            /* If both array don't match it means that question_order was not correctly set
               for all questions using the default mysql order */
            if (count($temp_question_list) != $count_question_orders) {
                $questionList = $temp_question_list;
            }
        }

        return $questionList;
    }

    /**
     * Select N values from the questions per category array.
     *
     * @param array $categoriesAddedInExercise
     * @param array $question_list
     * @param array $questions_by_category     per category
     * @param bool  $flatResult
     * @param bool  $randomizeQuestions
     *
     * @return array
     */
    private function pickQuestionsPerCategory(
        $categoriesAddedInExercise,
        $question_list,
        &$questions_by_category,
        $flatResult = true,
        $randomizeQuestions = false
    ) {
        $addAll = true;
        $categoryCountArray = [];

        // Getting how many questions will be selected per category.
        if (!empty($categoriesAddedInExercise)) {
            $addAll = false;
            // Parsing question according the category rel exercise settings
            foreach ($categoriesAddedInExercise as $category_info) {
                $category_id = $category_info['category_id'];
                if (isset($questions_by_category[$category_id])) {
                    // How many question will be picked from this category.
                    $count = $category_info['count_questions'];
                    // -1 means all questions
                    $categoryCountArray[$category_id] = $count;
                    if ($count == -1) {
                        $categoryCountArray[$category_id] = 999;
                    }
                }
            }
        }

        if (!empty($questions_by_category)) {
            $temp_question_list = [];
            foreach ($questions_by_category as $category_id => &$categoryQuestionList) {
                if (isset($categoryCountArray) && !empty($categoryCountArray)) {
                    $numberOfQuestions = 0;
                    if (isset($categoryCountArray[$category_id])) {
                        $numberOfQuestions = $categoryCountArray[$category_id];
                    }
                }

                if ($addAll) {
                    $numberOfQuestions = 999;
                }

                if (!empty($numberOfQuestions)) {
                    $elements = TestCategory::getNElementsFromArray(
                        $categoryQuestionList,
                        $numberOfQuestions,
                        $randomizeQuestions
                    );

                    if (!empty($elements)) {
                        $temp_question_list[$category_id] = $elements;
                        $categoryQuestionList = $elements;
                    }
                }
            }

            if (!empty($temp_question_list)) {
                if ($flatResult) {
                    $temp_question_list = array_flatten($temp_question_list);
                }
                $question_list = $temp_question_list;
            }
        }

        return $question_list;
    }

    /**
     * Changes the exercise id.
     *
     * @param int $id - exercise id
     */
    private function updateId($id)
    {
        $this->id = $id;
    }

    /**
     * Sends a notification when a user ends an examn.
     *
     * @param array  $question_list_answers
     * @param string $origin
     * @param array  $user_info
     * @param string $url_email
     * @param array  $teachers
     */
    private function sendNotificationForOpenQuestions(
        $question_list_answers,
        $origin,
        $user_info,
        $url_email,
        $teachers
    ) {
        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);
        $sessionId = api_get_session_id();
        $sessionData = '';
        if (!empty($sessionId)) {
            $sessionInfo = api_get_session_info($sessionId);
            if (!empty($sessionInfo)) {
                $sessionData = '<tr>'
                    .'<td><em>'.get_lang('SessionName').'</em></td>'
                    .'<td>&nbsp;<b>'.$sessionInfo['name'].'</b></td>'
                    .'</tr>';
            }
        }

        $msg = get_lang('OpenQuestionsAttempted').'<br /><br />'
            .get_lang('AttemptDetails').' : <br /><br />'
            .'<table>'
            .'<tr>'
            .'<td><em>'.get_lang('CourseName').'</em></td>'
            .'<td>&nbsp;<b>#course#</b></td>'
            .'</tr>'
            .$sessionData
            .'<tr>'
            .'<td>'.get_lang('TestAttempted').'</td>'
            .'<td>&nbsp;#exercise#</td>'
            .'</tr>'
            .'<tr>'
            .'<td>'.get_lang('StudentName').'</td>'
            .'<td>&nbsp;#firstName# #lastName#</td>'
            .'</tr>'
            .'<tr>'
            .'<td>'.get_lang('StudentEmail').'</td>'
            .'<td>&nbsp;#mail#</td>'
            .'</tr>'
            .'</table>';

        $open_question_list = null;
        foreach ($question_list_answers as $item) {
            $question = $item['question'];
            $answer = $item['answer'];
            $answer_type = $item['answer_type'];

            if (!empty($question) && !empty($answer) && $answer_type == FREE_ANSWER) {
                $open_question_list .=
                    '<tr>'
                    .'<td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Question').'</td>'
                    .'<td width="473" valign="top" bgcolor="#F3F3F3">'.$question.'</td>'
                    .'</tr>'
                    .'<tr>'
                    .'<td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Answer').'</td>'
                    .'<td valign="top" bgcolor="#F3F3F3">'.$answer.'</td>'
                    .'</tr>';
            }
        }

        if (!empty($open_question_list)) {
            $msg .= '<p><br />'.get_lang('OpenQuestionsAttemptedAre').' :</p>'.
                '<table width="730" height="136" border="0" cellpadding="3" cellspacing="3">';
            $msg .= $open_question_list;
            $msg .= '</table><br />';

            $msg = str_replace('#exercise#', $this->exercise, $msg);
            $msg = str_replace('#firstName#', $user_info['firstname'], $msg);
            $msg = str_replace('#lastName#', $user_info['lastname'], $msg);
            $msg = str_replace('#mail#', $user_info['email'], $msg);
            $msg = str_replace(
                '#course#',
                Display::url($courseInfo['title'], $courseInfo['course_public_url'].'?id_session='.$sessionId),
                $msg
            );

            if ($origin != 'learnpath') {
                $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            }
            $msg = str_replace('#url#', $url_email, $msg);
            $subject = get_lang('OpenQuestionsAttempted');

            if (!empty($teachers)) {
                foreach ($teachers as $user_id => $teacher_data) {
                    MessageManager::send_message_simple(
                        $user_id,
                        $subject,
                        $msg
                    );
                }
            }
        }
    }

    /**
     * Send notification for oral questions.
     *
     * @param array  $question_list_answers
     * @param string $origin
     * @param int    $exe_id
     * @param array  $user_info
     * @param string $url_email
     * @param array  $teachers
     */
    private function sendNotificationForOralQuestions(
        $question_list_answers,
        $origin,
        $exe_id,
        $user_info,
        $url_email,
        $teachers
    ) {
        // Email configuration settings
        $courseCode = api_get_course_id();
        $courseInfo = api_get_course_info($courseCode);
        $oral_question_list = null;
        foreach ($question_list_answers as $item) {
            $question = $item['question'];
            $file = $item['generated_oral_file'];
            $answer = $item['answer'];
            if ($answer == 0) {
                $answer = '';
            }
            $answer_type = $item['answer_type'];
            if (!empty($question) && (!empty($answer) || !empty($file)) && $answer_type == ORAL_EXPRESSION) {
                if (!empty($file)) {
                    $file = Display::url($file, $file);
                }
                $oral_question_list .= '<br />
                    <table width="730" height="136" border="0" cellpadding="3" cellspacing="3">
                    <tr>
                        <td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Question').'</td>
                        <td width="473" valign="top" bgcolor="#F3F3F3">'.$question.'</td>
                    </tr>
                    <tr>
                        <td width="220" valign="top" bgcolor="#E5EDF8">&nbsp;&nbsp;'.get_lang('Answer').'</td>
                        <td valign="top" bgcolor="#F3F3F3">'.$answer.$file.'</td>
                    </tr></table>';
            }
        }

        if (!empty($oral_question_list)) {
            $msg = get_lang('OralQuestionsAttempted').'<br /><br />
                    '.get_lang('AttemptDetails').' : <br /><br />
                    <table>
                        <tr>
                            <td><em>'.get_lang('CourseName').'</em></td>
                            <td>&nbsp;<b>#course#</b></td>
                        </tr>
                        <tr>
                            <td>'.get_lang('TestAttempted').'</td>
                            <td>&nbsp;#exercise#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentName').'</td>
                            <td>&nbsp;#firstName# #lastName#</td>
                        </tr>
                        <tr>
                            <td>'.get_lang('StudentEmail').'</td>
                            <td>&nbsp;#mail#</td>
                        </tr>
                    </table>';
            $msg .= '<br />'.sprintf(get_lang('OralQuestionsAttemptedAreX'), $oral_question_list).'<br />';
            $msg1 = str_replace("#exercise#", $this->exercise, $msg);
            $msg = str_replace("#firstName#", $user_info['firstname'], $msg1);
            $msg1 = str_replace("#lastName#", $user_info['lastname'], $msg);
            $msg = str_replace("#mail#", $user_info['email'], $msg1);
            $msg = str_replace("#course#", $courseInfo['name'], $msg1);

            if (!in_array($origin, ['learnpath', 'embeddable'])) {
                $msg .= '<br /><a href="#url#">'.get_lang('ClickToCommentAndGiveFeedback').'</a>';
            }
            $msg1 = str_replace("#url#", $url_email, $msg);
            $mail_content = $msg1;
            $subject = get_lang('OralQuestionsAttempted');

            if (!empty($teachers)) {
                foreach ($teachers as $user_id => $teacher_data) {
                    MessageManager::send_message_simple(
                        $user_id,
                        $subject,
                        $mail_content
                    );
                }
            }
        }
    }

    /**
     * Returns an array with the media list.
     *
     * @param array question list
     *
     * @example there's 1 question with iid 5 that belongs to the media question with iid = 100
     * <code>
     * array (size=2)
     *  999 =>
     *    array (size=3)
     *      0 => int 7
     *      1 => int 6
     *      2 => int 3254
     *  100 =>
     *   array (size=1)
     *      0 => int 5
     *  </code>
     */
    private function setMediaList($questionList)
    {
        $mediaList = [];
        /*
         * Media feature is not activated in 1.11.x
        if (!empty($questionList)) {
            foreach ($questionList as $questionId) {
                $objQuestionTmp = Question::read($questionId, $this->course_id);
                // If a media question exists
                if (isset($objQuestionTmp->parent_id) && $objQuestionTmp->parent_id != 0) {
                    $mediaList[$objQuestionTmp->parent_id][] = $objQuestionTmp->id;
                } else {
                    // Always the last item
                    $mediaList[999][] = $objQuestionTmp->id;
                }
            }
        }*/

        $this->mediaList = $mediaList;
    }

    /**
     * @param FormValidator $form
     *
     * @return HTML_QuickForm_group
     */
    private function setResultDisabledGroup(FormValidator $form)
    {
        $resultDisabledGroup = [];

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ShowScoreAndRightAnswer'),
            '0',
            ['id' => 'result_disabled_0']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('DoNotShowScoreNorRightAnswer'),
            '1',
            ['id' => 'result_disabled_1', 'onclick' => 'check_results_disabled()']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('OnlyShowScore'),
            '2',
            ['id' => 'result_disabled_2', 'onclick' => 'check_results_disabled()']
        );

        if (in_array($this->getFeedbackType(), [EXERCISE_FEEDBACK_TYPE_DIRECT, EXERCISE_FEEDBACK_TYPE_POPUP])) {
            $group = $form->addGroup(
                $resultDisabledGroup,
                null,
                get_lang('ShowResultsToStudents')
            );

            return $group;
        }

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ShowScoreEveryAttemptShowAnswersLastAttempt'),
            '4',
            ['id' => 'result_disabled_4']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('DontShowScoreOnlyWhenUserFinishesAllAttemptsButShowFeedbackEachAttempt'),
            '5',
            ['id' => 'result_disabled_5', 'onclick' => 'check_results_disabled()']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseRankingMode'),
            RESULT_DISABLE_RANKING,
            ['id' => 'result_disabled_6']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseShowOnlyGlobalScoreAndCorrectAnswers'),
            RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER,
            ['id' => 'result_disabled_7']
        );

        $resultDisabledGroup[] = $form->createElement(
            'radio',
            'results_disabled',
            null,
            get_lang('ExerciseAutoEvaluationAndRankingMode'),
            RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING,
            ['id' => 'result_disabled_8']
        );

        $group = $form->addGroup(
            $resultDisabledGroup,
            null,
            get_lang('ShowResultsToStudents')
        );

        return $group;
    }
}