'; 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) {
	$table_track_exercises = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
	$table_track_attempt_recording   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);	
	$exe_id 		= intval($exe_id);
	
	$sql = "SELECT * FROM $table_track_exercises WHERE 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";
		$res_question = Database::query($sql);
		while ($row_q = Database::fetch_array($res_question,'ASSOC')) {
			$list[$exe_id]['question_list'][$row_q['question_id']] = $row_q;
		}
	}
	//echo '
'; print_r($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_user($user_id, $exercise_id, $course_code, $session_id = 0, $lp_id = 0, $lp_item_id = 0) {
	$table_track_exercises = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
	$table_track_attempt_recording   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);
    $course_code 	= Database::escape_string($course_code);
    $exercise_id 	= intval($exercise_id);
    $session_id 	= intval($session_id);
    $user_id    	= intval($user_id);
    $lp_id			= intval($lp_id);
    $lp_item_id		= intval($lp_item_id);
    
    $sql = "SELECT * FROM $table_track_exercises 
    		WHERE status = '' AND exe_user_id = $user_id AND exe_cours_id = '$course_code' 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";    
    
    $res = Database::query($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']] = $row_q;
        }       
    }
    //echo '
'; print_r($list);
    return $list;
}



/**
 * Count exercise attempts (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 count_exercise_attempts_by_user($user_id, $exercise_id, $course_code, $session_id = 0) {
	$TABLETRACK_EXERCICES  = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$TBL_TRACK_ATTEMPT     = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
	$course_code           = Database::escape_string($course_code);
	$exercise_id           = intval($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 exe_cours_id = '$course_code' AND exe_exo_id = '$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   string  course code
 * @param   int     session id
 * @return  array   with the results
 * 
 */
function get_best_exercise_results_by_user($exercise_id, $course_code, $session_id = 0) {
	$table_track_exercises = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
	$course_code           = Database::escape_string($course_code);
	$exercise_id           = intval($exercise_id);
	$session_id            = intval($session_id);
	
	$sql = "SELECT * FROM $table_track_exercises WHERE status = ''  AND exe_cours_id = '$course_code' 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']] = $row_q;
		}		
	}
	/*
	echo count($list);
	echo '
';
	echo '
'; print_r($list);*/
	//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'];	    
	    //echo $current_best_score[$user_id].' - '.$best_score_return[$user_id]['exe_result'].'
';	    
	    if ($current_best_score[$user_id] > $best_score_return[$user_id]['exe_result']) {
	        $best_score_return[$user_id] = $student_result;
	    }
	}
	/*
	echo count($best_score_return);
	echo '
'; print_r($best_score_return);*/
	return $best_score_return;
}


/**
 * Gets all exercise BEST results attempts (NO Exercises in LPs ) from a given exercise id, course, session per user
 * @param   int     exercise id
 * @param   string  course code
 * @param   int     session id
 * @return  array   with the results
 * 
 */
function get_count_exercises_attempted_by_course($course_code, $session_id = 0) {
	$table_track_exercises = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
	$course_code           = Database::escape_string($course_code);	
	$session_id            = intval($session_id);
	
	$sql = "SELECT DISTINCT exe_exo_id, exe_user_id FROM $table_track_exercises WHERE status = '' AND exe_cours_id = '$course_code' 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, $course_code, $session_id = 0) {
	$table_track_exercises = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $course_code = Database::escape_string($course_code);
    $exercise_id = intval($exercise_id);
    $session_id = intval($session_id);
    
  
    $sql = "SELECT * FROM $table_track_exercises WHERE status = ''  AND exe_cours_id = '$course_code' 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 $list;
}
/*
function get_all_exercise_event_from_lp($exercise_id, $course_db, $session_id ) {
	$lp_item_table = Database  :: get_course_table(TABLE_LP_ITEM,$course_db);
	$lp_item_view_table = Database  :: get_course_table(TABLE_LP_ITEM_VIEW,$course_db);
	$lp_view_table = Database  :: get_course_table(TABLE_LP_VIEW,$course_db);
	
	$exercise_id 	= intval($exercise_id);
	$session_id 	= intval($session_id);
	
	$sql = "SELECT  title, user_id, score , iv.max_score, status, session_id 
			FROM $lp_item_table as i INNER JOIN $lp_item_view_table iv ON (i.id = iv.lp_item_id ) INNER JOIN $lp_view_table v ON iv.lp_view_id = v.id 
			WHERE path = $exercise_id AND status ='completed' AND session_id = $session_id";
	$res = Database::query($sql);
	$list = array();	
	
	while($row = Database::fetch_array($res,'ASSOC')) {		
		$list[$row['exe_id']]['question_list'][$row['question_id']] = $row;				
	}
	//echo '
'; print_r($list);
	return $list;
}*/



function get_all_exercises_from_lp($lp_id, $course_db) {
	$lp_item_table = Database  :: get_course_table(TABLE_LP_ITEM,$course_db);
	$lp_id = intval($lp_id);
	$sql = "SELECT * FROM $lp_item_table WHERE lp_id = '".$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 $question_id
 * @return str the comment
 */
function get_comments($id,$question_id) {
	$table_track_attempt   = Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $sql = "SELECT teacher_comment FROM ".$table_track_attempt." where exe_id='".Database::escape_string($id)."' and question_id = '".Database::escape_string($question_id)."' ORDER by question_id";
    $sqlres = Database::query($sql);
    $comm = Database::result($sqlres,0,"teacher_comment");
    return $comm;
}