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

/**
 * Exercise
 * @package chamilo.exercise
 */
require_once '../inc/global.inc.php';

// the section (tabs)
$this_section=SECTION_COURSES;

// notice for unauthorized people.
api_protect_course_script(true);

// breadcrumbs
$interbreadcrumb[]=array("url" => "exercice.php","name" => get_lang('Exercices'));

// Tool name
$nameTools=get_lang('AddQuestionToExercise');

// The form
$form = new FormValidator('add_question','post',api_get_self().'?'.api_get_cidreq());
// form title
$form->addElement('header','',get_lang('AddQuestionToExercise'));

$question_list = Question::get_question_type_list();
$question_list_options = array();
foreach ($question_list as $key=> $value) {
    $question_list_options[$key] = addslashes(get_lang($value[1]));
}
$form->addElement('select', 'question_type_hidden', get_lang('QuestionType'), $question_list_options, array('id' => 'question_type_hidden'));

//session id
$session_id  = api_get_session_id();

// the exercices
$tbl_exercices = Database :: get_course_table(TABLE_QUIZ_TEST);
$course_id = api_get_course_int_id();

$sql = "SELECT id,title,type,description, results_disabled FROM $tbl_exercices WHERE c_id = $course_id AND active<>'-1' AND session_id=".$session_id." ORDER BY title ASC";
$result = Database::query($sql);
$exercises['-'] = '-'.get_lang('SelectExercice').'-';
while ($row = Database :: fetch_array($result)) {
	$exercises[$row['id']] = cut($row['title'], EXERCISE_MAX_NAME_SIZE);
}
$form->addElement('select', 'exercice', get_lang('Exercice'), $exercises);

// generate default content
$form->addElement('checkbox', 'is_content', null, get_lang('DefaultContent'), array('checked' => true));

// the submit button
$form->addButtonCreate(get_lang('CreateQuestion'), 'SubmitCreateQuestion');

// setting the rules
$form->addRule('exercice', get_lang('ThisFieldIsRequired'), 'required');
$form->addRule('exercice', get_lang('YouHaveToSelectATest'), 'numeric');

$form->registerRule('validquestiontype', 'callback', 'check_question_type');
$form->addRule('question_type_hidden', get_lang('InvalidQuestionType'), 'validquestiontype');

if ($form->validate()) {
	$values = $form->exportValues();
    $answer_type = $values['question_type_hidden'];

	// check feedback_type from current exercise for type of question delineation
	$exercise_id = intval($values['exercice']);
	$sql = "SELECT feedback_type FROM $tbl_exercices WHERE c_id = $course_id AND id = '$exercise_id'";
	$rs_feedback_type = Database::query($sql);
	$row_feedback_type = Database::fetch_row($rs_feedback_type);
	$feedback_type = $row_feedback_type[0];

	// if question type does not belong to self-evaluation (immediate feedback) it'll send an error
	if (($answer_type == HOT_SPOT_DELINEATION && $feedback_type != 1) ||
		($feedback_type == 1 && ($answer_type != HOT_SPOT_DELINEATION && $answer_type != UNIQUE_ANSWER))) {
		header('Location: question_create.php?'.api_get_cidreq().'&error=true');
		exit;
	}
	header('Location: admin.php?exerciseId='.$values['exercice'].'&newQuestion=yes&isContent='.$values['is_content'].'&answerType='.$answer_type);
	exit;
} else {
	// header
	Display::display_header($nameTools);

	echo '<div class="actions">';
	echo '<a href="exercice.php?show=test">'.Display :: return_icon('back.png', get_lang('BackToExercisesList'),'',ICON_SIZE_MEDIUM).'</a>';
	echo '</div>';

	// displaying the form
	$form->display();

	// footer
	Display::display_footer();
}

function check_question_type($parameter) {
    $question_list = Question::get_question_type_list();
	foreach ($question_list as $key => $value) {
		$valid_question_types[] = $key;
	}
	if (in_array($parameter, $valid_question_types)) {
		return true;
	} else {
		return false;
	}
}
