<?php
/* For licensing terms, see /license.txt */
/**
 *    File containing the Question class.
 * @package chamilo.exercise
 * @author Olivier Brouckaert
 * @author Julio Montoya <gugli100@gmail.com> lot of bug fixes
 *   Modified by hubert.borderiou@grenet.fr - add question categories
 */
/**
 * Code
 */


// Question types
define('UNIQUE_ANSWER', 1);
define('MULTIPLE_ANSWER', 2);
define('FILL_IN_BLANKS', 3);
define('MATCHING', 4);
define('FREE_ANSWER', 5);
define('HOT_SPOT', 6);
define('HOT_SPOT_ORDER', 7);
define('HOT_SPOT_DELINEATION', 8);
define('MULTIPLE_ANSWER_COMBINATION', 9);
define('UNIQUE_ANSWER_NO_OPTION', 10);
define('MULTIPLE_ANSWER_TRUE_FALSE', 11);
define('MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE', 12);
define('ORAL_EXPRESSION', 13);
define('GLOBAL_MULTIPLE_ANSWER', 14);
define('MEDIA_QUESTION', 15);
define('UNIQUE_ANSWER_IMAGE', 16);
define('DRAGGABLE', 17);

//Some alias used in the QTI exports
define('MCUA', 1);
define('TF', 1);
define('MCMA', 2);
define('FIB', 3);

/**
 *    QUESTION CLASS
 *
 *    This class allows to instantiate an object of type Question
 *
 * @author Olivier Brouckaert, original author
 * @author Patrick Cool, LaTeX support
 * @package chamilo.exercise
 */
abstract class Question
{
    public $id;
    public $question;
    public $description;
    public $weighting;
    public $position;
    public $type;
    public $level;
    public $picture;
    public $exerciseList; // array with the list of exercises which this question is in
    public $category_list;
    public $parent_id;
    private $isContent;
    public $course;
    static $typePicture = 'new_question.png';
    static $explanationLangVar = '';
    public $question_table_class = 'table table-striped';

    public $editionMode = 'normal';

    static $questionTypes = array(
        UNIQUE_ANSWER => array('unique_answer.class.php', 'UniqueAnswer'),
        MULTIPLE_ANSWER => array('multiple_answer.class.php', 'MultipleAnswer'),
        FILL_IN_BLANKS => array('fill_blanks.class.php', 'FillBlanks'),
        MATCHING => array('matching.class.php', 'Matching'),
        FREE_ANSWER => array('freeanswer.class.php', 'FreeAnswer'),
        ORAL_EXPRESSION => array('oral_expression.class.php', 'OralExpression'),
        HOT_SPOT => array('hotspot.class.php', 'HotSpot'),
        HOT_SPOT_DELINEATION => array('hotspot.class.php', 'HotspotDelineation'),
        MULTIPLE_ANSWER_COMBINATION => array('multiple_answer_combination.class.php', 'MultipleAnswerCombination'),
        UNIQUE_ANSWER_NO_OPTION => array('unique_answer_no_option.class.php', 'UniqueAnswerNoOption'),
        MULTIPLE_ANSWER_TRUE_FALSE => array('multiple_answer_true_false.class.php', 'MultipleAnswerTrueFalse'),
        MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE => array(
            'multiple_answer_combination_true_false.class.php',
            'MultipleAnswerCombinationTrueFalse'
        ),
        GLOBAL_MULTIPLE_ANSWER => array('global_multiple_answer.class.php', 'GlobalMultipleAnswer'),
        MEDIA_QUESTION => array('media_question.class.php', 'MediaQuestion'),
        UNIQUE_ANSWER_IMAGE => array('unique_answer_image.class.php', 'UniqueAnswerImage'),
        DRAGGABLE => array('draggable.class.php', 'Draggable')
    );

    /**
     * constructor of the class
     *
     * @author - Olivier Brouckaert
     */
    public function Question()
    {
        $this->id = 0;
        $this->question = '';
        $this->description = '';
        $this->weighting = 0;
        $this->position = 1;
        $this->picture = '';
        $this->level = 1;
        $this->extra = ''; // This variable is used when loading an exercise like an scenario with an special hotspot: final_overlap, final_missing, final_excess
        $this->exerciseList = array();
        $this->course = api_get_course_info();
        $this->category_list = array();
        $this->parent_id = 0;
        $this->editionMode = 'normal';
    }

    public function getIsContent()
    {
        $isContent = null;
        if (isset($_REQUEST['isContent'])) {
            $isContent = intval($_REQUEST['isContent']);
        }

        return $this->isContent = $isContent;
    }

    /**
     * Reads question informations from the data base
     *
     * @author - Olivier Brouckaert
     * @param - integer $id - question ID
     * @return - boolean - true if question exists, otherwise false
     */
    static function read($id, $course_id = null)
    {
        $id = intval($id);

        if (!empty($course_id)) {
            $course_info = api_get_course_info_by_id($course_id);
        } else {
            $course_info = api_get_course_info();
        }

        $course_id = $course_info['real_id'];

        if (empty($course_id) || $course_id == -1) {
            return false;
        }

        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);

        $sql = "SELECT question,description,ponderation,position,type,picture,level, extra, parent_id FROM $TBL_QUESTIONS WHERE c_id = $course_id AND id = $id ";

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

        // if the question has been found
        if ($object = Database::fetch_object($result)) {

            $objQuestion = Question::getInstance($object->type);
            if (!empty($objQuestion)) {

                $objQuestion->id = $id;
                $objQuestion->question = $object->question;
                $objQuestion->description = $object->description;
                $objQuestion->weighting = $object->ponderation;
                $objQuestion->position = $object->position;
                $objQuestion->type = $object->type;
                $objQuestion->picture = $object->picture;
                $objQuestion->level = (int)$object->level;
                $objQuestion->extra = $object->extra;
                $objQuestion->course = $course_info;
                $objQuestion->parent_id = $object->parent_id;
                $objQuestion->category_list = Testcategory::getCategoryForQuestion($id);

                $sql = "SELECT exercice_id FROM $TBL_EXERCICE_QUESTION WHERE c_id = $course_id AND question_id = $id";
                $result_exercise_list = Database::query($sql);

                // fills the array with the exercises which this question is in
                if ($result_exercise_list) {
                    while ($obj = Database::fetch_object($result_exercise_list)) {
                        $objQuestion->exerciseList[] = $obj->exercice_id;
                    }
                }

                return $objQuestion;
            }
        }

        // question not found
        return false;
    }

    public function setEditionMode($mode)
    {
        $this->editionMode = $mode;
    }

    public function getEditionMode()
    {
        return $this->editionMode;
    }

    /**
     * returns the question ID
     *
     * @author - Olivier Brouckaert
     * @return - integer - question ID
     */
    function selectId()
    {
        return $this->id;
    }

    /**
     * returns the question title
     *
     * @author - Olivier Brouckaert
     * @return - string - question title
     */
    function selectTitle()
    {
        return $this->question;
    }

    /**
     * returns the question description
     *
     * @author - Olivier Brouckaert
     * @return - string - question description
     */
    function selectDescription()
    {
        $this->description = $this->description;

        return $this->description;
    }

    /**
     * returns the question weighting
     *
     * @author - Olivier Brouckaert
     * @return - integer - question weighting
     */
    function selectWeighting()
    {
        return $this->weighting;
    }

    /**
     * returns the question position
     *
     * @author - Olivier Brouckaert
     * @return - integer - question position
     */
    function selectPosition()
    {
        return $this->position;
    }

    /**
     * returns the answer type
     *
     * @author - Olivier Brouckaert
     * @return - integer - answer type
     */
    function selectType()
    {
        return $this->type;
    }

    /**
     * returns the level of the question
     *
     * @author - Nicolas Raynaud
     * @return - integer - level of the question, 0 by default.
     */
    function selectLevel()
    {
        return $this->level;
    }

    /**
     * returns the picture name
     *
     * @author - Olivier Brouckaert
     * @return - string - picture name
     */
    function selectPicture()
    {
        return $this->picture;
    }

    function selectPicturePath()
    {
        if (!empty($this->picture)) {
            return api_get_path(WEB_COURSE_PATH).$this->course['path'].'/document/images/'.$this->picture;
        }

        return false;
    }

    /**
     * returns the array with the exercise ID list
     *
     * @author - Olivier Brouckaert
     * @return - array - list of exercise ID which the question is in
     */
    function selectExerciseList()
    {
        return $this->exerciseList;
    }

    /**
     * returns the number of exercises which this question is in
     *
     * @author - Olivier Brouckaert
     * @return - integer - number of exercises
     */
    function selectNbrExercises()
    {
        return sizeof($this->exerciseList);
    }

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

    function updateParentId($id)
    {
        $this->parent_id = intval($id);
    }

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

    /**
     * changes the question weighting
     *
     * @author - Olivier Brouckaert
     * @param - integer $weighting - question weighting
     */
    function updateWeighting($weighting)
    {
        $this->weighting = $weighting;
    }

    /**
     * @author - Hubert Borderiou 12-10-2011
     * @param - array of category $in_category
     */
    function updateCategory($category_list)
    {
        $this->category_list = $category_list;
    }

    /**
     * @author - Hubert Borderiou 12-10-2011
     * @param - interger $in_positive
     */
    function updateScoreAlwaysPositive($in_positive)
    {
        $this->scoreAlwaysPositive = $in_positive;
    }

    /**
     * @author - Hubert Borderiou 12-10-2011
     * @param - interger $in_positive
     */
    function updateUncheckedMayScore($in_positive)
    {
        $this->uncheckedMayScore = $in_positive;
    }

    /**
     * Save category of a question
     *
     * A question can have n categories
     * if category is empty, then question has no category then delete the category entry
     *
     * @param  - int $in_positive
     * @author - Julio Montoya - Adding multiple cat support
     */
    function saveCategories($category_list)
    {

        if (!empty($category_list)) {
            $this->deleteCategory();
            $TBL_QUESTION_REL_CATEGORY = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);

            // update or add category for a question
            foreach ($category_list as $category_id) {
                $category_id = intval($category_id);
                $question_id = Database::escape_string($this->id);
                $sql = "SELECT count(*) AS nb FROM $TBL_QUESTION_REL_CATEGORY WHERE category_id = $category_id AND question_id = $question_id AND c_id=".api_get_course_int_id(
                );
                $res = Database::query($sql);
                $row = Database::fetch_array($res);
                if ($row['nb'] > 0) {
                    //DO nothing
                    //$sql = "UPDATE $TBL_QUESTION_REL_CATEGORY SET category_id = $category_id WHERE question_id=$question_id AND c_id=".api_get_course_int_id();
                    //$res = Database::query($sql);
                } else {
                    $sql = "INSERT INTO $TBL_QUESTION_REL_CATEGORY (c_id, question_id, category_id) VALUES (".api_get_course_int_id(
                    ).", $question_id, $category_id)";
                    $res = Database::query($sql);
                }
            }
        }
    }

    /**
     * @author - Hubert Borderiou 12-10-2011
     * @param - interger $in_positive
     * in this version, a question can only have 1 category
     * if category is 0, then question has no category then delete the category entry
     */
    function saveCategory($in_category)
    {
        if ($in_category <= 0) {
            $this->deleteCategory();
        } else {
            // update or add category for a question

            $TBL_QUESTION_REL_CATEGORY = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);
            $category_id = Database::escape_string($in_category);
            $question_id = Database::escape_string($this->id);
            $sql = "SELECT count(*) AS nb FROM $TBL_QUESTION_REL_CATEGORY WHERE question_id=$question_id AND c_id=".api_get_course_int_id(
            );
            $res = Database::query($sql);
            $row = Database::fetch_array($res);
            if ($row['nb'] > 0) {
                $sql = "UPDATE $TBL_QUESTION_REL_CATEGORY SET category_id=$category_id WHERE question_id=$question_id AND c_id=".api_get_course_int_id(
                );
                $res = Database::query($sql);
            } else {
                $sql = "INSERT INTO $TBL_QUESTION_REL_CATEGORY VALUES (".api_get_course_int_id(
                ).", $question_id, $category_id)";
                $res = Database::query($sql);
            }
        }
    }

    /**
     * @author hubert borderiou 12-10-2011
     * delete any category entry for question id
     * @param : none
     * delte the category for question
     */
    function deleteCategory()
    {
        $TBL_QUESTION_REL_CATEGORY = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);
        $question_id = Database::escape_string($this->id);
        $sql = "DELETE FROM $TBL_QUESTION_REL_CATEGORY WHERE question_id = $question_id AND c_id = ".api_get_course_int_id(
        );
        Database::query($sql);
    }

    /**
     * changes the question position
     *
     * @author - Olivier Brouckaert
     * @param - integer $position - question position
     */
    function updatePosition($position)
    {
        $this->position = $position;
    }

    /**
     * changes the question level
     *
     * @author - Nicolas Raynaud
     * @param - integer $level - question level
     */
    function updateLevel($level)
    {
        $this->level = $level;
    }

    /**
     * changes the answer type. If the user changes the type from "unique answer" to "multiple answers"
     * (or conversely) answers are not deleted, otherwise yes
     *
     * @author - Olivier Brouckaert
     * @param - integer $type - answer type
     */
    function updateType($type)
    {
        $TBL_REPONSES = Database::get_course_table(TABLE_QUIZ_ANSWER);
        $course_id = $this->course['real_id'];

        if (empty($course_id)) {
            $course_id = api_get_course_int_id();
        }
        // if we really change the type
        if ($type != $this->type) {
            // if we don't change from "unique answer" to "multiple answers" (or conversely)
            if (!in_array($this->type, array(UNIQUE_ANSWER, MULTIPLE_ANSWER)) || !in_array(
                $type,
                array(UNIQUE_ANSWER, MULTIPLE_ANSWER)
            )
            ) {
                // removes old answers
                $sql = "DELETE FROM $TBL_REPONSES WHERE c_id = $course_id  AND question_id='".Database::escape_string(
                    $this->id
                )."'";
                Database::query($sql);
            }

            $this->type = $type;
        }
    }

    /**
     * adds a picture to the question
     *
     * @author - Olivier Brouckaert
     * @param - string $Picture - temporary path of the picture to upload
     * @param - string $PictureName - Name of the picture
     * @return - boolean - true if uploaded, otherwise false
     */
    function uploadPicture($Picture, $PictureName, $picturePath = null)
    {
        if (empty($picturePath)) {
            global $picturePath;
        }

        if (!file_exists($picturePath)) {
            if (mkdir($picturePath, api_get_permissions_for_new_directories())) {
                // document path
                $documentPath = api_get_path(SYS_COURSE_PATH).$this->course['path']."/document";
                $path = str_replace($documentPath, '', $picturePath);
                $title_path = basename($picturePath);
                $doc_id = FileManager::add_document($this->course, $path, 'folder', 0, $title_path);
                api_item_property_update($this->course, TOOL_DOCUMENT, $doc_id, 'FolderCreated', api_get_user_id());
            }
        }

        // if the question has got an ID
        if ($this->id) {
            $extension = pathinfo($PictureName, PATHINFO_EXTENSION);
            $this->picture = 'quiz-'.$this->id.'.jpg';
            $o_img = new Image($Picture);
            $o_img->send_image($picturePath.'/'.$this->picture, -1, 'jpg');
            $document_id = FileManager::add_document(
                $this->course,
                '/images/'.$this->picture,
                'file',
                filesize($picturePath.'/'.$this->picture),
                $this->picture
            );
            if ($document_id) {
                return api_item_property_update(
                    $this->course,
                    TOOL_DOCUMENT,
                    $document_id,
                    'DocumentAdded',
                    api_get_user_id()
                );
            }
        }

        return false;
    }

    /**
     * Resizes a picture || Warning!: can only be called after uploadPicture, or if picture is already available in object.
     *
     * @author - Toon Keppens
     * @param - string $Dimension - Resizing happens proportional according to given dimension: height|width|any
     * @param - integer $Max - Maximum size
     * @return - boolean - true if success, false if failed
     */
    function resizePicture($Dimension, $Max)
    {
        global $picturePath;

        // if the question has an ID
        if ($this->id) {
            // Get dimensions from current image.
            $my_image = new Image($picturePath.'/'.$this->picture);

            $current_image_size = $my_image->get_image_size();
            $current_width = $current_image_size['width'];
            $current_height = $current_image_size['height'];

            if ($current_width < $Max && $current_height < $Max) {
                return true;
            } elseif ($current_height == "") {
                return false;
            }

            // Resize according to height.
            if ($Dimension == "height") {
                $resize_scale = $current_height / $Max;
                $new_height = $Max;
                $new_width = ceil($current_width / $resize_scale);
            }

            // Resize according to width
            if ($Dimension == "width") {
                $resize_scale = $current_width / $Max;
                $new_width = $Max;
                $new_height = ceil($current_height / $resize_scale);
            }

            // Resize according to height or width, both should not be larger than $Max after resizing.
            if ($Dimension == "any") {
                if ($current_height > $current_width || $current_height == $current_width) {
                    $resize_scale = $current_height / $Max;
                    $new_height = $Max;
                    $new_width = ceil($current_width / $resize_scale);
                }
                if ($current_height < $current_width) {
                    $resize_scale = $current_width / $Max;
                    $new_width = $Max;
                    $new_height = ceil($current_height / $resize_scale);
                }
            }

            $my_image->resize($new_width, $new_height);
            $result = $my_image->send_image($picturePath.'/'.$this->picture);

            if ($result) {
                return true;
            } else {
                return false;
            }
        }
    }

    /**
     * deletes the picture
     *
     * @author - Olivier Brouckaert
     * @return - boolean - true if removed, otherwise false
     */
    function removePicture()
    {
        global $picturePath;

        // if the question has got an ID and if the picture exists
        if ($this->id) {
            $picture = $this->picture;
            $this->picture = '';

            return @unlink($picturePath.'/'.$picture) ? true : false;
        }

        return false;
    }

    /**
     * Exports a picture to another question
     *
     * @author - Olivier Brouckaert
     * @param - integer $questionId - ID of the target question
     * @return - boolean - true if copied, otherwise false
     */
    function exportPicture($questionId, $course_info)
    {
        $course_id = $course_info['real_id'];
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $destination_path = api_get_path(SYS_COURSE_PATH).$course_info['path'].'/document/images';
        $source_path = api_get_path(SYS_COURSE_PATH).$this->course['path'].'/document/images';

        // if the question has got an ID and if the picture exists
        if ($this->id && !empty($this->picture)) {
            $picture = explode('.', $this->picture);
            $extension = $picture[sizeof($picture) - 1];
            $picture = 'quiz-'.$questionId.'.'.$extension;
            $result = @copy($source_path.'/'.$this->picture, $destination_path.'/'.$picture) ? true : false;
            //If copy was correct then add to the database
            if ($result) {
                $sql = "UPDATE $TBL_QUESTIONS SET picture='".Database::escape_string(
                    $picture
                )."' WHERE c_id = $course_id AND id='".intval($questionId)."'";
                Database::query($sql);

                $document_id = FileManager::add_document(
                    $course_info,
                    '/images/'.$picture,
                    'file',
                    filesize($destination_path.'/'.$picture),
                    $picture
                );
                if ($document_id) {
                    return api_item_property_update(
                        $course_info,
                        TOOL_DOCUMENT,
                        $document_id,
                        'DocumentAdded',
                        api_get_user_id()
                    );
                }
            }

            return $result;
        }

        return false;
    }

    /**
     * Saves the picture coming from POST into a temporary file
     * Temporary pictures are used when we don't want to save a picture right after a form submission.
     * For example, if we first show a confirmation box.
     *
     * @author - Olivier Brouckaert
     * @param - string $Picture - temporary path of the picture to move
     * @param - string $PictureName - Name of the picture
     */
    function setTmpPicture($Picture, $PictureName)
    {
        global $picturePath;
        $PictureName = explode('.', $PictureName);
        $Extension = $PictureName[sizeof($PictureName) - 1];

        // saves the picture into a temporary file
        @move_uploaded_file($Picture, $picturePath.'/tmp.'.$Extension);
    }

    /**
    Sets the title
     */
    public function setTitle($title)
    {
        $this->question = $title;
    }

    /**
    Sets the title
     */
    public function setExtra($extra)
    {
        $this->extra = $extra;
    }

    /**
     * Moves the temporary question "tmp" to "quiz-$questionId"
     * Temporary pictures are used when we don't want to save a picture right after a form submission.
     * For example, if we first show a confirmation box.
     *
     * @author - Olivier Brouckaert
     * @return - boolean - true if moved, otherwise false
     */
    function getTmpPicture()
    {
        global $picturePath;

        // if the question has got an ID and if the picture exists
        if ($this->id) {
            if (file_exists($picturePath.'/tmp.jpg')) {
                $Extension = 'jpg';
            } elseif (file_exists($picturePath.'/tmp.gif')) {
                $Extension = 'gif';
            } elseif (file_exists($picturePath.'/tmp.png')) {
                $Extension = 'png';
            }
            $this->picture = 'quiz-'.$this->id.'.'.$Extension;

            return @rename($picturePath.'/tmp.'.$Extension, $picturePath.'/'.$this->picture) ? true : false;
        }

        return false;
    }

    /**
     * updates the question in the data base
     * if an exercise ID is provided, we add that exercise ID into the exercise list
     *
     * @author - Olivier Brouckaert
     * @param - integer $exerciseId - exercise ID if saving in an exercise
     */
    function save($exerciseId = 0)
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);

        $id = $this->id;
        $question = $this->question;
        $description = $this->description;
        $weighting = $this->weighting;
        $position = $this->position;
        $type = $this->type;
        $picture = $this->picture;
        $level = $this->level;
        $extra = $this->extra;
        $c_id = $this->course['real_id'];
        $category_list = $this->category_list;

        // question already exists
        if (!empty($id)) {
            $sql = "UPDATE $TBL_QUESTIONS SET
					question 	='".Database::escape_string($question)."',
					description	='".Database::escape_string($description)."',
					ponderation	='".Database::escape_string($weighting)."',
					position	='".Database::escape_string($position)."',
					type		='".Database::escape_string($type)."',
					picture		='".Database::escape_string($picture)."',
                    extra       ='".Database::escape_string($extra)."',
					level		='".Database::escape_string($level)."',
                    parent_id   =  ".$this->parent_id."
				WHERE c_id = $c_id AND id='".Database::escape_string($id)."'";

            Database::query($sql);
            $this->saveCategories($category_list);

            if (!empty($exerciseId)) {
                api_item_property_update($this->course, TOOL_QUIZ, $id, 'QuizQuestionUpdated', api_get_user_id());
            }
            if (api_get_setting('search_enabled') == 'true') {
                if ($exerciseId != 0) {
                    $this->search_engine_edit($exerciseId);
                } else {
                    /**
                     * actually there is *not* an user interface for
                     * creating questions without a relation with an exercise
                     */
                }
            }
        } else {
            // creates a new question
            $sql = "SELECT max(position) FROM $TBL_QUESTIONS as question, $TBL_EXERCICE_QUESTION as test_question
					   WHERE 	question.id					= test_question.question_id AND
								test_question.exercice_id	= '".Database::escape_string($exerciseId)."' AND
								question.c_id 				= $c_id AND
								test_question.c_id 			= $c_id ";
            $result = Database::query($sql);
            $current_position = Database::result($result, 0, 0);
            $this->updatePosition($current_position + 1);
            $position = $this->position;
            $sql = "INSERT INTO $TBL_QUESTIONS (c_id, question, description, ponderation, position, type, picture, extra, level, parent_id) VALUES ( ".
                " $c_id, ".
                " '".Database::escape_string($question)."', ".
                " '".Database::escape_string($description)."', ".
                " '".Database::escape_string($weighting)."', ".
                " '".Database::escape_string($position)."', ".
                " '".Database::escape_string($type)."', ".
                " '".Database::escape_string($picture)."', ".
                " '".Database::escape_string($extra)."', ".
                " '".Database::escape_string($level)."', ".
                " '".$this->parent_id."' ".
                " )";
            Database::query($sql);

            $this->id = Database::insert_id();

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

            // If hotspot, create first answer
            if ($type == HOT_SPOT || $type == HOT_SPOT_ORDER) {
                $TBL_ANSWERS = Database::get_course_table(TABLE_QUIZ_ANSWER);
                $sql = "INSERT INTO $TBL_ANSWERS (c_id, id, question_id , answer , correct , comment , ponderation , position , hotspot_coordinates , hotspot_type )
					    VALUES (".$c_id.", '1', '".Database::escape_string(
                    $this->id
                )."', '', NULL , '', '10' , '1', '0;0|0|0', 'square')";
                Database::query($sql);
            }

            if ($type == HOT_SPOT_DELINEATION) {
                $TBL_ANSWERS = Database::get_course_table(TABLE_QUIZ_ANSWER);
                $sql = "INSERT INTO $TBL_ANSWERS (c_id, id, question_id , answer , correct , comment , ponderation , position , hotspot_coordinates , hotspot_type )
					  VALUES (".$c_id.", '1', '".Database::escape_string(
                    $this->id
                )."', '', NULL , '', '10' , '1', '0;0|0|0', 'delineation')";
                Database::query($sql);
            }

            if (api_get_setting('search_enabled') == 'true') {
                if ($exerciseId != 0) {
                    $this->search_engine_edit($exerciseId, true);
                } else {
                    /**
                     * actually there is *not* an user interface for
                     * creating questions without a relation with an exercise
                     */
                }
            }
        }

        // if the question is created in an exercise
        if ($exerciseId) {
            /*
            $sql = 'UPDATE '.Database::get_course_table(TABLE_LP_ITEM).'
                    SET max_score = '.intval($weighting).'
                    WHERE item_type = "'.TOOL_QUIZ.'"
                    AND path='.intval($exerciseId);
            Database::query($sql);
            */
            // adds the exercise into the exercise list of this question
            $this->addToList($exerciseId, true);
        }
    }

    function search_engine_edit($exerciseId, $addQs = false, $rmQs = false)
    {
        // update search engine and its values table if enabled
        if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
            $course_id = api_get_course_id();
            // get search_did
            $tbl_se_ref = Database::get_main_table(TABLE_MAIN_SEARCH_ENGINE_REF);
            if ($addQs || $rmQs) {
                //there's only one row per question on normal db and one document per question on search engine db
                $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_second_level=%s LIMIT 1';
                $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
            } else {
                $sql = 'SELECT * FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=%s AND ref_id_second_level=%s LIMIT 1';
                $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $exerciseId, $this->id);
            }
            $res = Database::query($sql);

            if (Database::num_rows($res) > 0 || $addQs) {
                require_once(api_get_path(LIBRARY_PATH).'search/ChamiloIndexer.class.php');
                require_once(api_get_path(LIBRARY_PATH).'search/IndexableChunk.class.php');

                $di = new ChamiloIndexer();
                if ($addQs) {
                    $question_exercises = array((int)$exerciseId);
                } else {
                    $question_exercises = array();
                }
                isset($_POST['language']) ? $lang = Database::escape_string($_POST['language']) : $lang = 'english';
                $di->connectDb(null, null, $lang);

                // retrieve others exercise ids
                $se_ref = Database::fetch_array($res);
                $se_doc = $di->get_document((int)$se_ref['search_did']);
                if ($se_doc !== false) {
                    if (($se_doc_data = $di->get_document_data($se_doc)) !== false) {
                        $se_doc_data = unserialize($se_doc_data);
                        if (isset($se_doc_data[SE_DATA]['type']) && $se_doc_data[SE_DATA]['type'] == SE_DOCTYPE_EXERCISE_QUESTION) {
                            if (isset($se_doc_data[SE_DATA]['exercise_ids']) && is_array(
                                $se_doc_data[SE_DATA]['exercise_ids']
                            )
                            ) {
                                foreach ($se_doc_data[SE_DATA]['exercise_ids'] as $old_value) {
                                    if (!in_array($old_value, $question_exercises)) {
                                        $question_exercises[] = $old_value;
                                    }
                                }
                            }
                        }
                    }
                }
                if ($rmQs) {
                    while (($key = array_search($exerciseId, $question_exercises)) !== false) {
                        unset($question_exercises[$key]);
                    }
                }

                // build the chunk to index
                $ic_slide = new IndexableChunk();
                $ic_slide->addValue("title", $this->question);
                $ic_slide->addCourseId($course_id);
                $ic_slide->addToolId(TOOL_QUIZ);
                $xapian_data = array(
                    SE_COURSE_ID => $course_id,
                    SE_TOOL_ID => TOOL_QUIZ,
                    SE_DATA => array(
                        'type' => SE_DOCTYPE_EXERCISE_QUESTION,
                        'exercise_ids' => $question_exercises,
                        'question_id' => (int)$this->id
                    ),
                    SE_USER => (int)api_get_user_id(),
                );
                $ic_slide->xapian_data = serialize($xapian_data);
                $ic_slide->addValue("content", $this->description);

                //TODO: index answers, see also form validation on question_admin.inc.php

                $di->remove_document((int)$se_ref['search_did']);
                $di->addChunk($ic_slide);

                //index and return search engine document id
                if (!empty($question_exercises)) { // if empty there is nothing to index
                    $did = $di->index();
                    unset($di);
                }
                if ($did || $rmQs) {
                    // save it to db
                    if ($addQs || $rmQs) {
                        $sql = 'DELETE FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_second_level=\'%s\'';
                        $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $this->id);
                    } else {
                        $sql = 'DELETE FROM %s WHERE course_code=\'%s\' AND tool_id=\'%s\' AND ref_id_high_level=\'%s\' AND ref_id_second_level=\'%s\'';
                        $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $exerciseId, $this->id);
                    }
                    Database::query($sql);
                    if ($rmQs) {
                        if (!empty($question_exercises)) {
                            $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, ref_id_second_level, search_did)
                              VALUES (NULL , \'%s\', \'%s\', %s, %s, %s)';
                            $sql = sprintf(
                                $sql,
                                $tbl_se_ref,
                                $course_id,
                                TOOL_QUIZ,
                                array_shift($question_exercises),
                                $this->id,
                                $did
                            );
                            Database::query($sql);
                        }
                    } else {
                        $sql = 'INSERT INTO %s (id, course_code, tool_id, ref_id_high_level, ref_id_second_level, search_did)
                            VALUES (NULL , \'%s\', \'%s\', %s, %s, %s)';
                        $sql = sprintf($sql, $tbl_se_ref, $course_id, TOOL_QUIZ, $exerciseId, $this->id, $did);
                        Database::query($sql);
                    }
                }

            }
        }

    }

    /**
     * adds an exercise into the exercise list
     *
     * @author - Olivier Brouckaert
     * @param - integer $exerciseId - exercise ID
     * @param - boolean $fromSave - comming from $this->save() or not
     */
    function addToList($exerciseId, $fromSave = false)
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $id = $this->id;
        // checks if the exercise ID is not in the list
        if (!in_array($exerciseId, $this->exerciseList)) {
            $this->exerciseList[] = $exerciseId;
            $new_exercise = new Exercise();
            $new_exercise->read($exerciseId);
            $count = $new_exercise->selectNbrQuestions();
            $count++;
            $sql = "INSERT INTO $TBL_EXERCICE_QUESTION (c_id, question_id, exercice_id, question_order) VALUES
				 ({$this->course['real_id']}, '".Database::escape_string($id)."','".Database::escape_string(
                $exerciseId
            )."', '$count' )";
            Database::query($sql);

            // we do not want to reindex if we had just saved adnd indexed the question
            if (!$fromSave) {
                $this->search_engine_edit($exerciseId, true);
            }
        }
    }

    /**
     * removes an exercise from the exercise list
     *
     * @author - Olivier Brouckaert
     * @param - integer $exerciseId - exercise ID
     * @return - boolean - true if removed, otherwise false
     */
    function removeFromList($exerciseId)
    {
        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);

        $id = $this->id;

        // searches the position of the exercise ID in the list
        $pos = array_search($exerciseId, $this->exerciseList);

        $course_id = api_get_course_int_id();

        // exercise not found
        if ($pos === false) {
            return false;
        } else {
            // deletes the position in the array containing the wanted exercise ID
            unset($this->exerciseList[$pos]);
            //update order of other elements
            $sql = "SELECT question_order FROM $TBL_EXERCICE_QUESTION WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."' AND exercice_id='".Database::escape_string($exerciseId)."'";
            $res = Database::query($sql);
            if (Database::num_rows($res) > 0) {
                $row = Database::fetch_array($res);
                if (!empty($row['question_order'])) {
                    $sql = "UPDATE $TBL_EXERCICE_QUESTION SET question_order = question_order-1
                            WHERE c_id = $course_id AND exercice_id='".Database::escape_string(
                        $exerciseId
                    )."' AND question_order > ".$row['question_order'];
                    $res = Database::query($sql);
                }
            }

            $sql = "DELETE FROM $TBL_EXERCICE_QUESTION WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."' AND exercice_id='".Database::escape_string($exerciseId)."'";
            Database::query($sql);

            return true;
        }
    }

    /**
     * Deletes a question from the database
     * the parameter tells if the question is removed from all exercises (value = 0),
     * or just from one exercise (value = exercise ID)
     *
     * @author - Olivier Brouckaert
     * @param - integer $deleteFromEx - exercise ID if the question is only removed from one exercise
     */
    function delete($deleteFromEx = 0)
    {
        $course_id = api_get_course_int_id();

        $TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $TBL_REPONSES = Database::get_course_table(TABLE_QUIZ_ANSWER);
        $TBL_QUIZ_QUESTION_REL_CATEGORY = Database::get_course_table(TABLE_QUIZ_QUESTION_REL_CATEGORY);

        $id = $this->id;

        // if the question must be removed from all exercises
        if (!$deleteFromEx) {
            //update the question_order of each question to avoid inconsistencies
            $sql = "SELECT exercice_id, question_order FROM $TBL_EXERCICE_QUESTION WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."'";
            $res = Database::query($sql);
            if (Database::num_rows($res) > 0) {
                while ($row = Database::fetch_array($res)) {
                    if (!empty($row['question_order'])) {
                        $sql = "UPDATE $TBL_EXERCICE_QUESTION
                                SET question_order = question_order-1
                                WHERE c_id = $course_id AND exercice_id='".Database::escape_string(
                            $row['exercice_id']
                        )."' AND question_order > ".$row['question_order'];
                        Database::query($sql);
                    }
                }
            }
            $sql = "DELETE FROM $TBL_EXERCICE_QUESTION WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."'";
            Database::query($sql);

            $sql = "DELETE FROM $TBL_QUESTIONS WHERE c_id = $course_id AND id='".Database::escape_string($id)."'";
            Database::query($sql);

            $sql = "DELETE FROM $TBL_REPONSES WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."'";
            Database::query($sql);

            // remove the category of this question in the question_rel_category table
            $sql = "DELETE FROM $TBL_QUIZ_QUESTION_REL_CATEGORY WHERE c_id = $course_id AND question_id='".Database::escape_string(
                $id
            )."' AND c_id=".api_get_course_int_id();
            Database::query($sql);

            api_item_property_update($this->course, TOOL_QUIZ, $id, 'QuizQuestionDeleted', api_get_user_id());
            $this->removePicture();

            // resets the object
            $this->Question();
        } else {
            // just removes the exercise from the list
            $this->removeFromList($deleteFromEx);
            if (api_get_setting('search_enabled') == 'true' && extension_loaded('xapian')) {
                // disassociate question with this exercise
                $this->search_engine_edit($deleteFromEx, false, true);
            }
            api_item_property_update($this->course, TOOL_QUIZ, $id, 'QuizQuestionDeleted', api_get_user_id());
        }
    }

    /**
     * Duplicates the question
     *
     * @author Olivier Brouckaert
     * @param  array   Course info of the destination course
     * @return int     ID of the new question
     */

    function duplicate($course_info = null)
    {
        if (empty($course_info)) {
            $course_info = $this->course;
        } else {
            $course_info = $course_info;
        }
        $TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $TBL_QUESTION_OPTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION_OPTION);

        $question = $this->question;
        $description = $this->description;
        $weighting = $this->weighting;
        $position = $this->position;
        $type = $this->type;
        $level = intval($this->level);
        $extra = $this->extra;

        //Using the same method used in the course copy to transform URLs

        if ($this->course['id'] != $course_info['id']) {
            $description = DocumentManager::replace_urls_inside_content_html_from_copy_course(
                $description,
                $this->course['id'],
                $course_info['id']
            );
            $question = DocumentManager::replace_urls_inside_content_html_from_copy_course(
                $question,
                $this->course['id'],
                $course_info['id']
            );
        }

        $course_id = $course_info['real_id'];

        //Read the source options
        $options = self::readQuestionOption($this->id, $this->course['real_id']);

        //Inserting in the new course db / or the same course db
        $sql = "INSERT INTO $TBL_QUESTIONS (c_id, question, description, ponderation, position, type, level, extra )
				VALUES ('$course_id', '".Database::escape_string($question)."','".Database::escape_string(
            $description
        )."','".Database::escape_string($weighting)."','".Database::escape_string(
            $position
        )."','".Database::escape_string($type)."' ,'".Database::escape_string($level)."' ,'".Database::escape_string(
            $extra
        )."'  )";
        Database::query($sql);

        $new_question_id = Database::insert_id();

        if (!empty($options)) {
            //Saving the quiz_options
            foreach ($options as $item) {
                $item['question_id'] = $new_question_id;
                $item['c_id'] = $course_id;
                unset($item['id']);
                Database::insert($TBL_QUESTION_OPTIONS, $item);
            }
        }

        // Duplicates the picture of the hotspot
        $this->exportPicture($new_question_id, $course_info);

        return $new_question_id;
    }

    function get_question_type_name()
    {
        $key = self::$questionTypes[$this->type];

        return get_lang($key[1]);
    }

    static function get_question_type($type)
    {
        if ($type == ORAL_EXPRESSION && api_get_setting('enable_nanogong') != 'true') {
            return null;
        }

        return self::$questionTypes[$type];
    }

    static function get_question_type_list()
    {
        if (api_get_setting('enable_nanogong') != 'true') {
            self::$questionTypes[ORAL_EXPRESSION] = null;
            unset(self::$questionTypes[ORAL_EXPRESSION]);
        }

        return self::$questionTypes;
    }

    /**
     * Returns an instance of the class corresponding to the type
     * @param integer $type the type of the question
     * @return an instance of a Question subclass (or of Questionc class by default)
     */
    static function getInstance($type)
    {
        if (!is_null($type)) {
            list($file_name, $class_name) = self::get_question_type($type);
            if (!empty($file_name)) {
                include_once $file_name;
                if (class_exists($class_name)) {
                    return new $class_name();
                } else {
                    echo 'Can\'t instanciate class '.$class_name.' of type '.$type;
                }
            }
        }

        return null;
    }

    /**
     * Creates the form to create / edit a question
     * A subclass can redifine this function to add fields...
     * @param FormValidator $form the formvalidator instance (by reference)
     */
    function createForm(&$form, $fck_config = 0)
    {
        echo '	<style>
					.media { display:none;}
				</style>';
        echo '<script>
			// hack to hide http://cksource.com/forums/viewtopic.php?f=6&t=8700

			function FCKeditor_OnComplete( editorInstance ) {
			   if (document.getElementById ( \'HiddenFCK\' + editorInstance.Name )) {
			      HideFCKEditorByInstanceName (editorInstance.Name);
			   }
			}

			function HideFCKEditorByInstanceName ( editorInstanceName ) {
			   if (document.getElementById ( \'HiddenFCK\' + editorInstanceName ).className == "HideFCKEditor" ) {
			      document.getElementById ( \'HiddenFCK\' + editorInstanceName ).className = "media";
			      }
			}

			function show_media(){
				var my_display = document.getElementById(\'HiddenFCKquestionDescription\').style.display;
				if(my_display== \'none\' || my_display == \'\') {
				document.getElementById(\'HiddenFCKquestionDescription\').style.display = \'block\';
				document.getElementById(\'media_icon\').innerHTML=\'&nbsp;<img style="vertical-align: middle;" src="../img/looknfeelna.png" alt="" />&nbsp;'.get_lang(
            'EnrichQuestion'
        ).'\';
			} else {
				document.getElementById(\'HiddenFCKquestionDescription\').style.display = \'none\';
				document.getElementById(\'media_icon\').innerHTML=\'&nbsp;<img style="vertical-align: middle;" src="../img/looknfeel.png" alt="" />&nbsp;'.get_lang(
            'EnrichQuestion'
        ).'\';
			}
		}

		// hub 13-12-2010
		function visiblerDevisibler(in_id) {
			if (document.getElementById(in_id)) {
				if (document.getElementById(in_id).style.display == "none") {
					document.getElementById(in_id).style.display = "block";
					if (document.getElementById(in_id+"Img")) {
						document.getElementById(in_id+"Img").src = "../img/div_hide.gif";
					}
				}
				else {
					document.getElementById(in_id).style.display = "none";
					if (document.getElementById(in_id+"Img")) {
						document.getElementById(in_id+"Img").src = "../img/div_show.gif";
					}
				}
			}
		}
		</script>';

        // question name
        $form->addElement('text', 'questionName', get_lang('Question'), array('class' => 'span6'));
        $form->addRule('questionName', get_lang('GiveQuestion'), 'required');

        // default content
        $isContent = isset($_REQUEST['isContent']) ? intval($_REQUEST['isContent']) : null;

        // Question type
        $answerType = isset($_REQUEST['answerType']) ? intval($_REQUEST['answerType']) : $this->selectType();
        $form->addElement('hidden', 'answerType', $answerType);

        // html editor
        $editor_config = array('ToolbarSet' => 'TestQuestionDescription', 'Width' => '100%', 'Height' => '150');
        if (is_array($fck_config)) {
            $editor_config = array_merge($editor_config, $fck_config);
        }

        if (!api_is_allowed_to_edit(null, true)) {
            $editor_config['UserStatus'] = 'student';
        }

        $form->addElement(
            'advanced_settings',
            '<a href="javascript://" onclick=" return show_media()"><span id="media_icon"><img style="vertical-align: middle;" src="../img/looknfeel.png" alt="" />&nbsp;'.get_lang(
                'EnrichQuestion'
            ).'</span></a>
		'
        );

        $form->addElement('html', '<div class="HideFCKEditor" id="HiddenFCKquestionDescription" >');
        $form->add_html_editor('questionDescription', get_lang('QuestionDescription'), false, false, $editor_config);
        $form->addElement('html', '</div>');

        // hidden values
        $my_id = isset($_REQUEST['myid']) ? intval($_REQUEST['myid']) : null;
        $form->addElement('hidden', 'myid', $my_id);

        if ($this->type != MEDIA_QUESTION) {

            // Advanced parameters
            $form->addElement(
                'advanced_settings',
                '<a href="javascript:void(0)" onclick="visiblerDevisibler(\'id_advancedOption\')"><img id="id_advancedOptionImg" style="vertical-align:middle;" src="../img/div_show.gif" alt="" />&nbsp;'.get_lang(
                    "AdvancedParameters"
                ).'</a>'
            );

            $form->addElement('html', '<div id="id_advancedOption" style="display:none;">');

            $select_level = Question::get_default_levels();
            $form->addElement('select', 'questionLevel', get_lang('Difficulty'), $select_level);

            // Categories
            $category_list = Testcategory::getCategoriesIdAndName();
            $form->addElement(
                'select',
                'questionCategory',
                get_lang('Category'),
                $category_list,
                array('multiple' => 'multiple')
            );

            // Categories
            //$tabCat = Testcategory::getCategoriesIdAndName();
            //$form->addElement('select', 'questionCategory', get_lang('Category'), $tabCat);

            //Medias
            //$course_medias = Question::prepare_course_media_select(api_get_course_int_id());
            //$form->addElement('select', 'parent_id', get_lang('AttachToMedia'), $course_medias);

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


        if (!isset($_GET['fromExercise'])) {
            switch ($answerType) {
                case 1:
                    $this->question = get_lang('DefaultUniqueQuestion');
                    break;
                case 2:
                    $this->question = get_lang('DefaultMultipleQuestion');
                    break;
                case 3:
                    $this->question = get_lang('DefaultFillBlankQuestion');
                    break;
                case 4:
                    $this->question = get_lang('DefaultMathingQuestion');
                    break;
                case 5:
                    $this->question = get_lang('DefaultOpenQuestion');
                    break;
                case 9:
                    $this->question = get_lang('DefaultMultipleQuestion');
                    break;
            }
        }


        // default values
        $defaults = array();
        $defaults['questionName'] = $this->question;
        $defaults['questionDescription'] = $this->description;
        $defaults['questionLevel'] = $this->level;
        $defaults['questionCategory'] = $this->category_list;
        $defaults['parent_id'] = $this->parent_id;

        //Came from he question pool
        if (isset($_GET['fromExercise'])) {
            $form->setDefaults($defaults);
        }

        if (!empty($_REQUEST['myid'])) {
            $form->setDefaults($defaults);
        } else {
            if ($isContent == 1) {
                $form->setDefaults($defaults);
            }
        }
    }


    /**
     * function which process the creation of questions
     * @param FormValidator $form the formvalidator instance
     * @param Exercise $objExercise the Exercise instance
     */
    function processCreation($form, $objExercise = null)
    {
        $this->updateParentId($form->getSubmitValue('parent_id'));
        $this->updateTitle($form->getSubmitValue('questionName'));
        $this->updateDescription($form->getSubmitValue('questionDescription'));
        $this->updateLevel($form->getSubmitValue('questionLevel'));
        $this->updateCategory($form->getSubmitValue('questionCategory'));

        //Save normal question if NOT media
        if ($this->type != MEDIA_QUESTION) {
            $this->save($objExercise->id);

            // modify the exercise
            $objExercise->addToList($this->id);
            $objExercise->update_question_positions();
        }
    }

    /**
     * abstract function which creates the form to create / edit the answers of the question
     * @param the formvalidator instance
     */
    abstract function createAnswersForm($form);

    /**
     * abstract function which process the creation of answers
     * @param the formvalidator instance
     */
    abstract function processAnswersCreation($form);


    /**
     * Displays the menu of question types
     */
    static function display_type_menu($objExercise)
    {
        $feedback_type = $objExercise->feedback_type;
        $exerciseId = $objExercise->id;

        // 1. by default we show all the question types
        $question_type_custom_list = self::get_question_type_list();

        if (!isset($feedback_type)) {
            $feedback_type = 0;
        }
        if ($feedback_type == 1) {
            //2. but if it is a feedback DIRECT we only show the UNIQUE_ANSWER type that is currently available
            $question_type_custom_list = array(
                UNIQUE_ANSWER => self::$questionTypes[UNIQUE_ANSWER],
                HOT_SPOT_DELINEATION => self::$questionTypes[HOT_SPOT_DELINEATION]
            );
        } else {
            unset($question_type_custom_list[HOT_SPOT_DELINEATION]);
        }

        echo '<div class="actionsbig">';
        echo '<ul class="question_menu">';

        foreach ($question_type_custom_list as $i => $a_type) {
            // include the class of the type
            require_once $a_type[0];
            // get the picture of the type and the langvar which describes it
            $img = $explanation = '';
            eval('$img = '.$a_type[1].'::$typePicture;');
            eval('$explanation = get_lang('.$a_type[1].'::$explanationLangVar);');
            echo '<li>';
            echo '<div class="icon_image_content">';
            if ($objExercise->exercise_was_added_in_lp == true) {
                $img = pathinfo($img);
                $img = $img['filename'].'_na.'.$img['extension'];
                echo Display::return_icon($img, $explanation);
            } else {
                echo '<a href="admin.php?'.api_get_cidreq().'&newQuestion=yes&answerType='.$i.'">'.Display::return_icon(
                    $img,
                    $explanation
                ).'</a>';
            }
            echo '</div>';
            echo '</li>';
        }

        echo '<li>';
        echo '<div class="icon_image_content">';
        if ($objExercise->exercise_was_added_in_lp == true) {
            echo Display::return_icon('database_na.png', get_lang('GetExistingQuestion'));
        } else {
            if ($feedback_type == 1) {
                echo $url = '<a href="question_pool.php?'.api_get_cidreq().'&type=1&fromExercise='.$exerciseId.'">';
            } else {
                echo $url = '<a href="question_pool.php?'.api_get_cidreq().'&fromExercise='.$exerciseId.'">';
            }
            echo Display::return_icon('database.png', get_lang('GetExistingQuestion'));
        }
        echo '</a>';
        echo '</div></li>';
        echo '</ul>';
        echo '</div>';
    }

    static function saveQuestionOption($question_id, $name, $course_id, $position = 0)
    {
        $TBL_EXERCICE_QUESTION_OPTION = Database::get_course_table(TABLE_QUIZ_QUESTION_OPTION);
        $params['question_id'] = intval($question_id);
        $params['name'] = $name;
        $params['position'] = $position;
        $params['c_id'] = $course_id;
        $result = self::readQuestionOption($question_id, $course_id);
        $last_id = Database::insert($TBL_EXERCICE_QUESTION_OPTION, $params);

        return $last_id;
    }

    static function deleteAllQuestionOptions($question_id, $course_id)
    {
        $TBL_EXERCICE_QUESTION_OPTION = Database::get_course_table(TABLE_QUIZ_QUESTION_OPTION);
        Database::delete(
            $TBL_EXERCICE_QUESTION_OPTION,
            array('c_id = ? AND question_id = ?' => array($course_id, $question_id))
        );
    }

    static function updateQuestionOption($id, $params, $course_id)
    {
        $TBL_EXERCICE_QUESTION_OPTION = Database::get_course_table(TABLE_QUIZ_QUESTION_OPTION);
        $result = Database::update(
            $TBL_EXERCICE_QUESTION_OPTION,
            $params,
            array('c_id = ? AND id = ?' => array($course_id, $id))
        );

        return $result;
    }

    static function readQuestionOption($question_id, $course_id)
    {
        $TBL_EXERCICE_QUESTION_OPTION = Database::get_course_table(TABLE_QUIZ_QUESTION_OPTION);
        $result = Database::select(
            '*',
            $TBL_EXERCICE_QUESTION_OPTION,
            array(
                'where' => array('c_id = ? AND question_id = ?' => array($course_id, $question_id)),
                'order' => 'id ASC'
            )
        );

        return $result;
    }

    /**
     * Shows question title an description
     *
     * @param type $feedback_type
     * @param type $counter
     * @param type $score
     *
     * @return string
     */
    function return_header($feedback_type = null, $counter = null, $score = null)
    {
        $counter_label = '';
        if (!empty($counter)) {
            $counter_label = intval($counter);
        }
        $score_label = get_lang('Wrong');
        $class = 'error';
        if ($score['pass'] == true) {
            $score_label = get_lang('Correct');
            $class = 'success';
        }

        if ($this->type == FREE_ANSWER || $this->type == ORAL_EXPRESSION) {
            if ($score['revised'] == true) {
                $score_label = get_lang('Revised');
                $class = '';
            } else {
                $score_label = get_lang('NotRevised');
                $class = 'error';
            }
        }
        $question_title = $this->question;

        // display question category, if any
        //$header = Testcategory::returnCategoryAndTitle($this->id);
        $show_media = null;
        $header = null;
        if ($show_media) {
            $header .= $this->show_media_content();
        }
        $header .= Display::page_subheader2($counter_label.". ".$question_title);
        $header .= Display::div(
            '<div class="rib rib-'.$class.'"><h3>'.$score_label.'</h3></div> <h4>'.$score['result'].' </h4>',
            array('class' => 'ribbon')
        );
        $header .= Display::div($this->description, array('id' => 'question_description'));

        return $header;
    }

    /**
     * Create a question from a set of parameters
     * @param   int     Quiz ID
     * @param   string  Question name
     * @param   int     Maximum result for the question
     * @param   int     Type of question (see constants at beginning of question.class.php)
     * @param   int     Question level/category
     */
    function create_question($quiz_id, $question_name, $max_score = 0, $type = 1, $level = 1)
    {
        $course_id = api_get_course_int_id();

        $tbl_quiz_question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $tbl_quiz_rel_question = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);

        $quiz_id = intval($quiz_id);
        $max_score = (float)$max_score;
        $type = intval($type);
        $level = intval($level);

        // Get the max position
        $sql = "SELECT max(position) as max_position"
            ." FROM $tbl_quiz_question q INNER JOIN $tbl_quiz_rel_question r"
            ." ON q.id = r.question_id"
            ." AND exercice_id = $quiz_id AND q.c_id = $course_id AND r.c_id = $course_id";
        $rs_max = Database::query($sql, __FILE__, __LINE__);
        $row_max = Database::fetch_object($rs_max);
        $max_position = $row_max->max_position + 1;

        // Insert the new question
        $sql = "INSERT INTO $tbl_quiz_question (c_id, question, ponderation, position, type, level)
                VALUES ($course_id, '".Database::escape_string(
            $question_name
        )."', '$max_score', $max_position, $type, $level)";
        $rs = Database::query($sql);
        // Get the question ID
        $question_id = Database::get_last_insert_id();

        // Get the max question_order
        $sql = "SELECT max(question_order) as max_order "
            ."FROM $tbl_quiz_rel_question WHERE c_id = $course_id AND exercice_id = $quiz_id ";
        $rs_max_order = Database::query($sql);
        $row_max_order = Database::fetch_object($rs_max_order);
        $max_order = $row_max_order->max_order + 1;
        // Attach questions to quiz
        $sql = "INSERT INTO $tbl_quiz_rel_question "
            ."(c_id, question_id,exercice_id,question_order)"
            ." VALUES($course_id, $question_id, $quiz_id, $max_order)";
        $rs = Database::query($sql);

        return $question_id;
    }

    /**
     * return the image filename of the question type
     *
     */
    public function get_type_icon_html()
    {
        $type = $this->selectType();
        $tabQuestionList = Question::get_question_type_list(); // [0]=file to include [1]=type name

        require_once $tabQuestionList[$type][0];
        eval('$img = '.$tabQuestionList[$type][1].'::$typePicture;');
        eval('$explanation = get_lang('.$tabQuestionList[$type][1].'::$explanationLangVar);');

        return array($img, $explanation);
    }

    /**
     * Get course medias
     * @param int course id
     */
    static function get_course_medias(
        $course_id,
        $start = 0,
        $limit = 100,
        $sidx = "question",
        $sord = "ASC",
        $where_condition = array()
    ) {
        $table_question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $default_where = array('c_id = ? AND parent_id = 0 AND type = ?' => array($course_id, MEDIA_QUESTION));
        if (!empty($where_condition)) {
            //$where_condition
        }
        $result = Database::select(
            '*',
            $table_question,
            array(
                'limit' => " $start, $limit",
                'where' => $default_where,
                'order' => "$sidx $sord"
            )
        );

        return $result;
    }

    /**
     * Get count course medias
     * @param int course id
     */
    static function get_count_course_medias($course_id)
    {
        $table_question = Database::get_course_table(TABLE_QUIZ_QUESTION);
        $result = Database::select(
            'count(*) as count',
            $table_question,
            array('where' => array('c_id = ? AND parent_id = 0 AND type = ?' => array($course_id, MEDIA_QUESTION))),
            'first'
        );

        if ($result && isset($result['count'])) {
            return $result['count'];
        }

        return 0;
    }

    static function prepare_course_media_select($course_id)
    {
        $medias = self::get_course_medias($course_id);
        $media_list = array();
        $media_list[0] = get_lang('NoMedia');

        if (!empty($medias)) {
            foreach ($medias as $media) {
                $media_list[$media['id']] = empty($media['question']) ? get_lang('Untitled') : $media['question'];
            }
        }

        return $media_list;
    }

    static function get_default_levels()
    {
        $select_level = array(
            1 => 1,
            2 => 2,
            3 => 3,
            4 => 4,
            5 => 5
        );

        return $select_level;
    }

    function show_media_content()
    {
        $html = null;
        if ($this->parent_id != 0) {
            $parent_question = Question::read($this->parent_id);
            $html = $parent_question->show_media_content();
        } else {
            $html .= Display::page_subheader($this->selectTitle());
            $html .= $this->selectDescription();
        }

        return $html;
    }
}