'; print_r($list);
    return $list;
}

/**
 * Gets exercise results (NO Exercises in LPs) from a given exercise id, course, session
 * @param   int     exercise id
 * @param   string  course code
 * @param   int     session id
 * @return  array   with the results
 *
 */
function get_exercise_results_by_attempt($exe_id, $status = null)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $table_track_attempt_recording = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
    $exe_id = intval($exe_id);

    $status = Database::escape_string($status);

    $sql = "SELECT * FROM $table_track_exercises WHERE status = '".$status."' AND exe_id = $exe_id";

    $res = Database::query($sql);
    $list = array();
    if (Database::num_rows($res)) {
        $row = Database::fetch_array($res, 'ASSOC');

        //Checking if this attempt was revised by a teacher
        $sql_revised = 'SELECT exe_id FROM '.$table_track_attempt_recording.' WHERE author != "" AND exe_id = '.$exe_id.' LIMIT 1';
        $res_revised = Database::query($sql_revised);
        $row['attempt_revised'] = 0;
        if (Database::num_rows($res_revised) > 0) {
            $row['attempt_revised'] = 1;
        }
        $list[$exe_id] = $row;
        $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = $exe_id ORDER BY tms ASC";
        $res_question = Database::query($sql);
        while ($row_q = Database::fetch_array($res_question, 'ASSOC')) {
            $list[$exe_id]['question_list'][$row_q['question_id']] = $row_q;
        }
    }
    return $list;
}

/**
 * Gets exercise results (NO Exercises in LPs) from a given user, exercise id, course, session, lp_id, lp_item_id
 * @param   int     user id
 * @param   int     exercise id
 * @param   string  course code
 * @param   int     session id
 * @param   int     lp id
 * @param   int     lp item id
 * @param   string 	order asc or desc
 * @return  array   with the results
 *
 */
function getExerciseResultsByUser($user_id, $exercise_id, $courseId, $session_id = 0, $lp_id = 0, $lp_item_id = 0, $order = null)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $table_track_attempt_recording = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
    $courseId = intval($courseId);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);
    $user_id = intval($user_id);
    $lp_id = intval($lp_id);
    $lp_item_id = intval($lp_item_id);

    if (!in_array(strtolower($order), array('asc', 'desc'))) {
        $order = 'asc';
    }

    $sql = "SELECT * FROM $table_track_exercises
        	WHERE 	status 			= '' AND
        			exe_user_id 	= $user_id AND
        			c_id 	        = $courseId AND
        			exe_exo_id 		= $exercise_id AND
        			session_id 		= $session_id AND
        			orig_lp_id 		= $lp_id AND
        			orig_lp_item_id = $lp_item_id
            ORDER by exe_id $order ";

    $res = Database::query($sql);
    $list = array();
    while ($row = Database::fetch_array($res, 'ASSOC')) {
        //Checking if this attempt was revised by a teacher
        $sql_revised = 'SELECT exe_id FROM '.$table_track_attempt_recording.' WHERE author != "" AND exe_id = '.$row['exe_id'].' LIMIT 1';
        $res_revised = Database::query($sql_revised);
        $row['attempt_revised'] = 0;
        if (Database::num_rows($res_revised) > 0) {
            $row['attempt_revised'] = 1;
        }
        $list[$row['exe_id']] = $row;
        $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = {$row['exe_id']}";
        $res_question = Database::query($sql);
        while ($row_q = Database::fetch_array($res_question, 'ASSOC')) {
            $list[$row['exe_id']]['question_list'][$row_q['question_id']] = $row_q;
        }
    }
    return $list;
}

/**
 * Count exercise attempts (NO Exercises in LPs ) from a given exercise id, course, session
 * @param   int     exercise id
 * @param   int     course id
 * @param   int     session id
 * @return  array   with the results
 *
 */
function count_exercise_attempts_by_user($user_id, $exercise_id, $courseId, $session_id = 0)
{
    $TABLETRACK_EXERCICES = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $courseId = intval($courseId);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);
    $user_id = intval($user_id);

    $sql = "SELECT count(*) as count FROM $TABLETRACK_EXERCICES
        	WHERE status = ''  AND
                exe_user_id = '$user_id' AND
                c_id = '$courseId' AND
                exe_exo_id = '$exercise_id' AND
                session_id = $session_id AND
                orig_lp_id =0 AND
                orig_lp_item_id = 0
        	ORDER BY exe_id";
    $res = Database::query($sql);
    $result = 0;
    if (Database::num_rows($res) > 0) {
        $row = Database::fetch_array($res, 'ASSOC');
        $result = $row['count'];
    }
    return $result;
}

/**
 * Gets all exercise BEST results attempts (NO Exercises in LPs ) from a given exercise id, course, session per user
 * @param   int     exercise id
 * @param   int     course id
 * @param   int     session id
 * @return  array   with the results
 * @todo rename this function
 *
 */
function get_best_exercise_results_by_user($exercise_id, $courseId, $session_id = 0)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $courseId = intval($courseId);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);

    $sql = "SELECT * FROM $table_track_exercises
            WHERE   status = '' AND
                    c_id = $courseId AND
                    exe_exo_id = '$exercise_id' AND
                    session_id = $session_id AND
                    orig_lp_id = 0 AND
                    orig_lp_item_id = 0
            ORDER BY exe_id";

    $res = Database::query($sql);
    $list = array();
    while ($row = Database::fetch_array($res, 'ASSOC')) {
        $list[$row['exe_id']] = $row;
        $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = {$row['exe_id']}";
        $res_question = Database::query($sql);
        while ($row_q = Database::fetch_array($res_question, 'ASSOC')) {
            $list[$row['exe_id']]['question_list'][$row_q['question_id']] = $row_q;
        }
    }

    //Getting the best results of every student
    $best_score_return = array();

    foreach ($list as $student_result) {
        $user_id = $student_result['exe_user_id'];
        $current_best_score[$user_id] = $student_result['exe_result'];

        if (isset($current_best_score[$user_id]) && isset($best_score_return[$user_id]) && $current_best_score[$user_id] > $best_score_return[$user_id]['exe_result']) {
            $best_score_return[$user_id] = $student_result;
        }
    }
    return $best_score_return;
}

/**
 * @param int $user_id
 * @param int $exercise_id
 * @param int $courseId
 * @param int $session_id
 * @return array
 */
function get_best_attempt_exercise_results_per_user($user_id, $exercise_id, $courseId, $session_id = 0)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $courseId = intval($courseId);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);
    $user_id = intval($user_id);

    $sql = "SELECT * FROM $table_track_exercises
            WHERE   status = ''  AND
                    c_id = '$courseId' AND
                    exe_exo_id = '$exercise_id' AND
                    session_id = $session_id  AND
                    exe_user_id = $user_id AND
                    orig_lp_id =0 AND
                    orig_lp_item_id = 0
                    ORDER BY exe_id";

    $res = Database::query($sql);
    $list = array();
    while ($row = Database::fetch_array($res, 'ASSOC')) {
        $list[$row['exe_id']] = $row;  /*
          $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = {$row['exe_id']}";
          $res_question = Database::query($sql);
          while($row_q = Database::fetch_array($res_question,'ASSOC')) {
          $list[$row['exe_id']]['question_list'][$row_q['question_id']] = $row_q;
          } */
    }
    //Getting the best results of every student
    $best_score_return = array();
    $best_score_return['exe_result'] = 0;

    foreach ($list as $result) {
        $current_best_score = $result;
        if ($current_best_score['exe_result'] > $best_score_return['exe_result']) {
            $best_score_return = $result;
        }
    }
    if (!isset($best_score_return['exe_weighting'])) {
        $best_score_return = array();
    }
    return $best_score_return;
}

/**
 * @param int $exercise_id
 * @param int $courseId
 * @param int $session_id
 * @return mixed
 */
function count_exercise_result_not_validated($exercise_id, $courseId, $session_id = 0)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
    $courseId = intval($courseId);
    $session_id = intval($session_id);
    $exercise_id = intval($exercise_id);

    $sql = "SELECT count(e.exe_id) as count
            FROM $table_track_exercises e LEFT JOIN $table_track_attempt a  ON e.exe_id = a.exe_id
            WHERE   exe_exo_id = $exercise_id AND
                    c_id = '$courseId' AND
                    e.session_id = $session_id  AND
                    orig_lp_id = 0 AND
                    marks IS NULL AND
                    status = '' AND
                    orig_lp_item_id = 0 ORDER BY e.exe_id";
    $res = Database::query($sql);
    $row = Database::fetch_array($res, 'ASSOC');

    return $row['count'];
}

/**
 * Gets all exercise BEST results attempts (NO Exercises in LPs ) from a given exercise id, course, session per user
 * @param   int     exercise id
 * @param   int   course id
 * @param   int     session id
 * @return  array   with the results
 *
 */
function get_count_exercises_attempted_by_course($courseId, $session_id = 0)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $courseId = intval($courseId);
    $session_id = intval($session_id);

    $sql = "SELECT DISTINCT exe_exo_id, exe_user_id
            FROM $table_track_exercises
            WHERE   status = '' AND
                    c_id = '$courseId' AND
                    session_id = $session_id AND
                    orig_lp_id =0 AND
                    orig_lp_item_id = 0
            ORDER BY exe_id";
    $res = Database::query($sql);
    $count = 0;
    if (Database::num_rows($res) > 0) {
        $count = Database::num_rows($res);
    }
    return $count;
}

/**
 * Gets all exercise events from a Learning Path within a Course 	nd Session
 * @param	int		exercise id
 * @param	string	course_code
 * @param 	int		session id
 * @return 	array
 */
function get_all_exercise_event_from_lp($exercise_id, $courseId, $session_id = 0)
{
    $table_track_exercises = Database::get_main_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $courseId = intval($courseId);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);

    $sql = "SELECT * FROM $table_track_exercises
            WHERE   status = '' AND
                    c_id = $courseId AND
                    exe_exo_id = '$exercise_id' AND
                    session_id = $session_id AND
                    orig_lp_id !=0 AND
                    orig_lp_item_id != 0";

    $res = Database::query($sql);
    $list = array();
    while ($row = Database::fetch_array($res, 'ASSOC')) {
        $list[$row['exe_id']] = $row;
        $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = {$row['exe_id']}";
        $res_question = Database::query($sql);
        while ($row_q = Database::fetch_array($res_question, 'ASSOC')) {
            $list[$row['exe_id']]['question_list'][$row_q['question_id']] = $row_q;
        }
    }
    return $list;
}

function get_all_exercises_from_lp($lp_id, $course_id)
{
    $lp_item_table = Database :: get_course_table(TABLE_LP_ITEM);
    $course_id = intval($course_id);
    $lp_id = intval($lp_id);
    $sql = "SELECT * FROM $lp_item_table WHERE c_id = $course_id AND lp_id = '".$lp_id."'  ORDER BY parent_item_id, display_order";
    $res = Database::query($sql);
    $my_exercise_list = array();
    while ($row = Database::fetch_array($res, 'ASSOC')) {
        if ($row['item_type'] == 'quiz') {
            $my_exercise_list[] = $row;
        }
    }
    return $my_exercise_list;
}

/**
 * This function gets the comments of an exercise
 *
 * @param int $id
 * @param int $question_id
 * @return string the comment
 */
function get_comments($exe_id, $question_id)
{
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $sql = "SELECT teacher_comment FROM ".$table_track_attempt."
            WHERE exe_id='".Database::escape_string($exe_id)."' AND question_id = '".Database::escape_string($question_id)."'
            ORDER by question_id";
    $sqlres = Database::query($sql);
    $comm = Database::result($sqlres, 0, "teacher_comment");
    return $comm;
}

/**
 * @param int $exe_id
 * @return array
 */
function getAllExerciseEventByExeId($exe_id)
{
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $exe_id = intval($exe_id);
    $list = array();

    $sql = "SELECT * FROM $table_track_attempt WHERE exe_id = $exe_id ORDER BY position";
    $res_question = Database::query($sql);
    if (Database::num_rows($res_question)) {
        while ($row_q = Database::fetch_array($res_question, 'ASSOC')) {
            $list[$row_q['question_id']][] = $row_q;
        }
    }
    return $list;
}

/**
 *
 * @param int $exe_id
 * @param int $user_id
 * @param int $courseId
 * @param int $session_id
 * @param int $question_id
 */
function delete_attempt($exe_id, $user_id, $courseId, $session_id, $question_id)
{
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

    $exe_id = intval($exe_id);
    $user_id = intval($user_id);
    $courseId = intval($courseId);
    $session_id = intval($session_id);
    $question_id = intval($question_id);

    $sql = "DELETE FROM $table_track_attempt
            WHERE   exe_id = $exe_id AND
                    user_id = $user_id AND
                    c_id = $courseId AND
                    session_id = $session_id AND
                    question_id = $question_id ";
    Database::query($sql);
}

/**
 * @param $exe_id
 * @param $user_id
 * @param int $courseId
 * @param $question_id
 */
function delete_attempt_hotspot($exe_id, $user_id, $courseId, $question_id)
{
    $table_track_attempt = Database::get_main_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);

    $exe_id = intval($exe_id);
    $user_id = intval($user_id);
    $courseId = intval($courseId);
    $question_id = intval($question_id);

    $sql = "DELETE FROM $table_track_attempt
            WHERE   hotspot_exe_id = $exe_id AND
                    hotspot_user_id = $user_id AND
                    c_id = $courseId AND
                    hotspot_question_id = $question_id ";
    Database::query($sql);
}

function getAnsweredQuestionsFromAttempt($exe_id, $objExercise)
{
    $attempt_list = getAllExerciseEventByExeId($exe_id);
    $exercise_result = array();
    if (!empty($attempt_list)) {
        foreach ($attempt_list as $question_id => $options) {
            foreach ($options as $item) {
                $question_obj = Question::read($item['question_id']);
                switch ($question_obj->type) {
                    case FILL_IN_BLANKS:
                        $item['answer'] = $objExercise->fill_in_blank_answer_to_string($item['answer']);
                        break;
                    case HOT_SPOT:
                        //var_dump($item['answer']);
                        break;
                }

                if ($item['answer'] != '0' && !empty($item['answer'])) {
                    $exercise_result[] = $question_id;
                    break;
                }
            }
        }
    }
    return $exercise_result;
}

/**
 * User logs in for the first time to a course
 * @param $course_code
 * @param $user_id
 * @param $session_id
 */
function event_course_login($courseId, $user_id, $session_id)
{
    $course_tracking_table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_COURSE_ACCESS);
    $time = api_get_datetime();

    $courseId = Database::escape_string($courseId);
    $user_id = Database::escape_string($user_id);
    $session_id = Database::escape_string($session_id);

    $sql = "INSERT INTO $course_tracking_table(c_id, user_id, login_course_date, logout_course_date, counter, session_id)
        	  VALUES('".$courseId."', '".$user_id."', '$time', '$time', '1', '".$session_id."')";
    Database::query($sql);

    //Course catalog stats modifications see #4191
    CourseManager::update_course_ranking(null, null, null, null, true, false);
}

/**
 * For the sake of genericity, this function is a switch.
 * It's called by EventsDispatcher and fires the good function
 * with the good require_once.
 *
 * @param string $event_name
 * @param array $params
 */
function event_send_mail($event_name, $params)
{
    EventsMail::send_mail($event_name, $params);
}

/**
 * Internal function checking if the mail was already sent from that user to that user
 * @param string $event_name
 * @param int $user_from
 * @param int $user_to
 * @return boolean
 */
function check_if_mail_already_sent($event_name, $user_from, $user_to = null)
{
    if ($user_to == null) {
        $sql = 'SELECT COUNT(*) as total FROM '.Database::get_main_table(TABLE_EVENT_SENT).'
                WHERE user_from = '.$user_from.' AND event_type_name = "'.$event_name.'"';
    } else {
        $sql = 'SELECT COUNT(*) as total FROM '.Database::get_main_table(TABLE_EVENT_SENT).'
                WHERE user_from = '.$user_from.' AND user_to = '.$user_to.' AND event_type_name = "'.$event_name.'"';
    }
    $result = Database::store_result(Database::query($sql), 'ASSOC');
    return $result[0]["total"];
}

/**
 *
 * Filter EventEmailTemplate Filters see the main/inc/conf/events.conf.dist.php
 *
 */

/**
 * Basic template event message filter (to be used by other filters as default)
 * @param array $values (passing by reference)
 * @return boolean True if everything is OK, false otherwise
 */
function _event_send_mail_filter_func(&$values)
{
    return true;
}

/**
 * user_registration - send_mail filter
 * @param array $values (passing by reference)
 * @return boolean True if everything is OK, false otherwise
 */
function user_registration_event_send_mail_filter_func(&$values)
{
    $res = _event_send_mail_filter_func($values);
    // proper logic for this filter
    return $res;
}

/**
 * portal_homepage_edited - send_mail filter
 * @param array $values (passing by reference)
 * @return boolean True if everything is OK, false otherwise
 */
function portal_homepage_edited_event_send_mail_filter_func(&$values)
{
    $res = _event_send_mail_filter_func($values);
    // proper logic for this filter
    return $res;
}