<?php
/**
 * @copyright (c) 2001-2006 Universite catholique de Louvain (UCL)
 *
 * @license http://www.gnu.org/copyleft/gpl.html (GPL) GENERAL PUBLIC LICENSE
 *
 * @package chamilo.exercise
 *
 * @author claro team <cvs@claroline.net>
 * @author Guillaume Lederer <guillaume@claroline.net>
 */

/**
 * function to create a temporary directory (SAME AS IN MODULE ADMIN)
 */

function tempdir($dir, $prefix = 'tmp', $mode = 0777) {
	if (substr($dir, -1) != '/')
		$dir .= '/';

	do {
		$path = $dir . $prefix . mt_rand(0, 9999999);
	} while (!mkdir($path, $mode));

	return $path;
}

/**
 * the path of the temporary directory where the exercise was uploaded and unzipped
 * @param string
 * @param string
 * @return bool
 */

function get_and_unzip_uploaded_exercise($baseWorkDir, $uploadPath)
{
    $_course = api_get_course_info();
    $_user = api_get_user_info();

	//Check if the file is valid (not to big and exists)
	if (!isset($_FILES['userFile']) || !is_uploaded_file($_FILES['userFile']['tmp_name'])) {
		// upload failed
		return false;
	}

	if (preg_match('/.zip$/i', $_FILES['userFile']['name']) &&
        handle_uploaded_document(
            $_course,
            $_FILES['userFile'],
            $baseWorkDir,
            $uploadPath,
            $_user['user_id'],
            0,
            null,
            1
        )
    ) {
		return true;
	}
    return false;
}

/**
 * Imports an exercise,
 * @param array $file
 * @return an array as a backlog of what was really imported, and error or debug messages to display
 */

function import_exercise($file)
{
	global $exercise_info;
	global $element_pile;
	global $non_HTML_tag_to_avoid;
	global $record_item_body;
	// used to specify the question directory where files could be found in relation in any question
	global $questionTempDir;

	$archive_path = api_get_path(SYS_ARCHIVE_PATH) . 'qti2';
	$baseWorkDir = $archive_path;

	if (!is_dir($baseWorkDir)) {
		mkdir($baseWorkDir, api_get_permissions_for_new_directories(), true);
	}

	$uploadPath = '/';

	// set some default values for the new exercise
	$exercise_info = array ();
	$exercise_info['name'] = preg_replace('/.zip$/i', '', $file);
	$exercise_info['question'] = array();
	$element_pile = array ();

	// create parser and array to retrieve info from manifest
	$element_pile = array (); //pile to known the depth in which we are
	//$module_info = array (); //array to store the info we need

	// if file is not a .zip, then we cancel all

	if (!preg_match('/.zip$/i', $file)) {

		return 'UplZipCorrupt';
	}

	// unzip the uploaded file in a tmp directory
	if (!get_and_unzip_uploaded_exercise($baseWorkDir, $uploadPath)) {

		return 'UplZipCorrupt';
	}

	// find the different manifests for each question and parse them.

	$exerciseHandle = opendir($baseWorkDir);
	//$question_number = 0;
	$file_found = false;
	$operation = false;
    $result = false;
    $filePath = null;

	// parse every subdirectory to search xml question files
	while (false !== ($file = readdir($exerciseHandle))) {

		if (is_dir($baseWorkDir . '/' . $file) && $file != "." && $file != "..") {
			// Find each manifest for each question repository found
			$questionHandle = opendir($baseWorkDir . '/' . $file);
			while (false !== ($questionFile = readdir($questionHandle))) {
				if (preg_match('/.xml$/i', $questionFile)) {
					$result = parse_file($baseWorkDir, $file, $questionFile);
                    $filePath = $baseWorkDir.$file;
					$file_found = true;
				}
			}
		} elseif (preg_match('/.xml$/i', $file)) {

            // Else ignore file
			$result = parse_file($baseWorkDir, '', $file);
            $filePath = $baseWorkDir.'/'.$file;
			$file_found = true;
		}
	}

	if (!$file_found) {

		return 'No XML file found in the zip';
	}

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

    $doc = new DOMDocument();
    $doc->load($filePath);
    $encoding = $doc->encoding;

	// 1. Create exercise.
	$exercise = new Exercise();
	$exercise->exercise = $exercise_info['name'];

	$exercise->save();
	$last_exercise_id = $exercise->selectId();
	if (!empty($last_exercise_id)) {
		// For each question found...
		foreach ($exercise_info['question'] as $question_array) {
			//2. Create question
			$question = new Ims2Question();
			$question->type = $question_array['type'];
			$question->setAnswer();
			$question->updateTitle(formatText($question_array['title']));
            //$question->updateDescription($question_array['title']);
			$type = $question->selectType();
			$question->type = constant($type);
			$question->save($last_exercise_id);
			$last_question_id = $question->selectId();
			//3. Create answer
			$answer = new Answer($last_question_id);
			$answer->new_nbrAnswers = count($question_array['answer']);
            $totalCorrectWeight = 0;
			foreach ($question_array['answer'] as $key => $answers) {
				$split = explode('_', $key);
				$i = $split[1];
                // Answer
				$answer->new_answer[$i] = formatText($answers['value']);
                // Comment
				$answer->new_comment[$i] = isset($answers['feedback']) ? formatText($answers['feedback']) : null;
                // Position
				$answer->new_position[$i] = $i;
				// Correct answers
				if (in_array($key, $question_array['correct_answers'])) {
					$answer->new_correct[$i] = 1;
				} else {
					$answer->new_correct[$i] = 0;
				}
				$answer->new_weighting[$i] = $question_array['weighting'][$key];
                if ($answer->new_correct[$i]) {
                    $totalCorrectWeight = $answer->new_weighting[$i];
                }
			}
            $question->updateWeighting($totalCorrectWeight);
            $question->save($last_exercise_id);
			$answer->save();
		}

		// delete the temp dir where the exercise was unzipped
		my_delete($baseWorkDir . $uploadPath);
		return $last_exercise_id;
	}

	return false;
}
/**
 * We assume the file charset is UTF8
 **/
function formatText($text)
{
    return api_html_entity_decode($text);
}

function parse_file($exercisePath, $file, $questionFile)
{
	global $exercise_info;
	global $element_pile;
	global $non_HTML_tag_to_avoid;
	global $record_item_body;
	global $questionTempDir;

	$questionTempDir = $exercisePath . '/' . $file . '/';
	$questionFilePath = $questionTempDir . $questionFile;

	if (!($fp = fopen($questionFilePath, 'r'))) {
		Display :: display_error_message(get_lang('Error opening question\'s XML file'));
		return false;
	} else {
		$data = fread($fp, filesize($questionFilePath));
	}

	//parse XML question file
	$data = str_replace(array('<p>', '</p>','<front>','</front>'), '', $data);

	//used global variable start values declaration :

	$record_item_body = false;
	$non_HTML_tag_to_avoid = array (
		"SIMPLECHOICE",
		"CHOICEINTERACTION",
		"INLINECHOICEINTERACTION",
		"INLINECHOICE",
		"SIMPLEMATCHSET",
		"SIMPLEASSOCIABLECHOICE",
		"TEXTENTRYINTERACTION",
		"FEEDBACKINLINE",
		"MATCHINTERACTION",
		"ITEMBODY",
		"BR",
		"IMG"
	);

	//this array to detect tag not supported by claroline import in the xml file to warn the user.

	$non_supported_content_in_question = array (
		"GAPMATCHINTERACTION",
		"EXTENDEDTEXTINTERACTION",
		"HOTTEXTINTERACTION",
		"HOTSPOTINTERACTION",
		"SELECTPOINTINTERACTION",
		"GRAPHICORDERINTERACTION",
		"GRAPHICASSOCIATIONINTERACTION",
		"GRAPHICGAPMATCHINTERACTION",
		"POSITIONOBJECTINTERACTION",
		"SLIDERINTERACTION",
		"DRAWINGINTERACTION",
		"UPLOADINTERACTION",
		"RESPONSECONDITION",
		"RESPONSEIF"
	);

    $question_format_supported = true;

	$xml_parser = xml_parser_create();
	xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, false);
	xml_set_element_handler($xml_parser, 'startElement', 'endElement');
	xml_set_character_data_handler($xml_parser, 'elementData');
	if (!xml_parse($xml_parser, $data, feof($fp))) {
		// if reading of the xml file in not successful :
		// set errorFound, set error msg, break while statement
		Display :: display_error_message(get_lang('Error reading XML file'));
		return false;
	}

	//close file
	fclose($fp);
	if (!$question_format_supported) {
		Display :: display_error_message(get_lang('Unknown question format in file %file', array (
			'%file' => $questionFile
		)));
		return false;
	}
	return true;
}

/**
 * Function used by the SAX xml parser when the parser meets a opening tag
 *
 * @param unknown_type $parser xml parser created with "xml_parser_create()"
 * @param unknown_type $name name of the element
 * @param unknown_type $attributes
 */

function startElement($parser, $name, $attributes) {
	global $element_pile;
	global $exercise_info;
	global $current_question_ident;
	global $current_answer_id;
	global $current_match_set;
	global $currentAssociableChoice;
	global $current_question_item_body;
	global $record_item_body;
	global $non_HTML_tag_to_avoid;
	global $current_inlinechoice_id;
	global $cardinality;
	global $questionTempDir;

	array_push($element_pile, $name);
	$current_element = end($element_pile);
	if (sizeof($element_pile) >= 2)
		$parent_element = $element_pile[sizeof($element_pile) - 2];
	else
		$parent_element = "";
	if (sizeof($element_pile) >= 3)
		$grant_parent_element = $element_pile[sizeof($element_pile) - 3];
	else
		$grant_parent_element = "";

	if ($record_item_body) {

		if ((!in_array($current_element, $non_HTML_tag_to_avoid))) {
			$current_question_item_body .= "<" . $name;

			foreach ($attributes as $attribute_name => $attribute_value) {
				$current_question_item_body .= " " . $attribute_name . "=\"" . $attribute_value . "\"";
			}
			$current_question_item_body .= ">";
		} else {
			//in case of FIB question, we replace the IMS-QTI tag b y the correct answer between "[" "]",
			//we first save with claroline tags ,then when the answer will be parsed, the claroline tags will be replaced

			if ($current_element == 'INLINECHOICEINTERACTION') {

				$current_question_item_body .= "**claroline_start**" . $attributes['RESPONSEIDENTIFIER'] . "**claroline_end**";
			}
			if ($current_element == 'TEXTENTRYINTERACTION') {
				$correct_answer_value = $exercise_info['question'][$current_question_ident]['correct_answers'][$current_answer_id];
				$current_question_item_body .= "[" . $correct_answer_value . "]";

			}
			if ($current_element == 'BR') {
				$current_question_item_body .= "<BR/>";
			}
		}
	}
	switch ($current_element) {
		case 'ASSESSMENTITEM' :
            //retrieve current question
            $current_question_ident = $attributes['IDENTIFIER'];
            $exercise_info['question'][$current_question_ident] = array ();
            $exercise_info['question'][$current_question_ident]['answer'] = array ();
            $exercise_info['question'][$current_question_ident]['correct_answers'] = array ();
            $exercise_info['question'][$current_question_ident]['title'] = $attributes['TITLE'];
            $exercise_info['question'][$current_question_ident]['tempdir'] = $questionTempDir;
            break;
		case 'SECTION':
            //retrieve exercise name
            $exercise_info['name'] = $attributes['TITLE'];
			break;
		case 'RESPONSEDECLARATION':
            // Retrieve question type
            if ("multiple" == $attributes['CARDINALITY']) {
                $exercise_info['question'][$current_question_ident]['type'] = 'MCMA';
                $cardinality = 'multiple';
            }
            if ("single" == $attributes['CARDINALITY']) {
                $exercise_info['question'][$current_question_ident]['type'] = 'MCUA';
                $cardinality = 'single';
            }
            //needed for FIB
            $current_answer_id = $attributes['IDENTIFIER'];
			break;
		case 'INLINECHOICEINTERACTION' :
            $exercise_info['question'][$current_question_ident]['type'] = 'FIB';
			$exercise_info['question'][$current_question_ident]['subtype'] = 'LISTBOX_FILL';
			$current_answer_id = $attributes['RESPONSEIDENTIFIER'];
			break;
		case 'INLINECHOICE' :
            $current_inlinechoice_id = $attributes['IDENTIFIER'];
			break;
		case 'TEXTENTRYINTERACTION':
            $exercise_info['question'][$current_question_ident]['type'] = 'FIB';
            $exercise_info['question'][$current_question_ident]['subtype'] = 'TEXTFIELD_FILL';
            $exercise_info['question'][$current_question_ident]['response_text'] = $current_question_item_body;
            //replace claroline tags
			break;
		case 'MATCHINTERACTION':
			$exercise_info['question'][$current_question_ident]['type'] = 'MATCHING';
			break;
		case 'SIMPLEMATCHSET' :
            if (!isset ($current_match_set)) {
                $current_match_set = 1;
            } else {
                $current_match_set++;
            }
            $exercise_info['question'][$current_question_ident]['answer'][$current_match_set] = array ();
			break;
		case 'SIMPLEASSOCIABLECHOICE':
            $currentAssociableChoice = $attributes['IDENTIFIER'];
			break;
			//retrieve answers id for MCUA and MCMA questions
		case 'SIMPLECHOICE':
            $current_answer_id = $attributes['IDENTIFIER'];
            if (!isset($exercise_info['question'][$current_question_ident]['answer'][$current_answer_id])) {
                $exercise_info['question'][$current_question_ident]['answer'][$current_answer_id] = array ();
            }
			break;
		case 'MAPENTRY':
            if ($parent_element == "MAPPING") {
                $answer_id = $attributes['MAPKEY'];

                if (!isset ($exercise_info['question'][$current_question_ident]['weighting'])) {
                    $exercise_info['question'][$current_question_ident]['weighting'] = array ();
                }
                $exercise_info['question'][$current_question_ident]['weighting'][$answer_id] = $attributes['MAPPEDVALUE'];
            }
			break;
		case 'MAPPING':
            if (isset ($attributes['DEFAULTVALUE'])) {
                $exercise_info['question'][$current_question_ident]['default_weighting'] = $attributes['DEFAULTVALUE'];
            }
		case 'ITEMBODY':
            $record_item_body = true;
            $current_question_item_body = '';
			break;
		case 'IMG':
            $exercise_info['question'][$current_question_ident]['attached_file_url'] = $attributes['SRC'];
			break;
	}
}

/**
 * Function used by the SAX xml parser when the parser meets a closing tag
 *
 * @param $parser xml parser created with "xml_parser_create()"
 * @param $name name of the element
 */

function endElement($parser, $name) {
	global $element_pile;
	global $exercise_info;
	global $current_question_ident;
	global $record_item_body;
	global $current_question_item_body;
	global $non_HTML_tag_to_avoid;
	global $cardinality;

	$current_element = end($element_pile);

	//treat the record of the full content of itembody tag :

	if ($record_item_body && (!in_array($current_element, $non_HTML_tag_to_avoid))) {
		$current_question_item_body .= "</" . $name . ">";
	}

	switch ($name) {
		case 'ITEMBODY':
            $record_item_body = false;
            if ($exercise_info['question'][$current_question_ident]['type'] == 'FIB') {
                $exercise_info['question'][$current_question_ident]['response_text'] = $current_question_item_body;
            } else {
                $exercise_info['question'][$current_question_ident]['statement'] = $current_question_item_body;
            }
			break;
	}
	array_pop($element_pile);

}

function elementData($parser, $data) {

	global $element_pile;
	global $exercise_info;
	global $current_question_ident;
	global $current_answer_id;
	global $current_match_set;
	global $currentAssociableChoice;
	global $current_question_item_body;
	global $record_item_body;
	global $non_HTML_tag_to_avoid;
	global $current_inlinechoice_id;
	global $cardinality;

	$current_element = end($element_pile);
	if (sizeof($element_pile) >= 2)
		$parent_element = $element_pile[sizeof($element_pile) - 2];
	else
		$parent_element = "";
	if (sizeof($element_pile) >= 3)
		$grant_parent_element = $element_pile[sizeof($element_pile) - 3];
	else
		$grant_parent_element = "";

	//treat the record of the full content of itembody tag (needed for question statment and/or FIB text:

	if ($record_item_body && (!in_array($current_element, $non_HTML_tag_to_avoid))) {
		$current_question_item_body .= $data;
	}

	switch ($current_element) {
		case 'SIMPLECHOICE':
            if (!isset ($exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['value'])) {
                $exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['value'] = trim($data);
            } else {
                $exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['value'] .= ''.trim($data);
            }
			break;
		case 'FEEDBACKINLINE' :
            if (!isset ($exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['feedback'])) {
                $exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['feedback'] = trim($data);
            } else {
                $exercise_info['question'][$current_question_ident]['answer'][$current_answer_id]['feedback'] .= ' ' . trim($data);
            }
			break;
		case 'SIMPLEASSOCIABLECHOICE':
			$exercise_info['question'][$current_question_ident]['answer'][$current_match_set][$currentAssociableChoice] = trim($data);
			break;
		case 'VALUE' :
            if ($parent_element == "CORRECTRESPONSE") {
                if ($cardinality == "single") {
                    $exercise_info['question'][$current_question_ident]['correct_answers'][$current_answer_id] = $data;
                } else {
                    $exercise_info['question'][$current_question_ident]['correct_answers'][] = $data;
                }
            }
			break;

		case 'ITEMBODY' :
            $current_question_item_body .= $data;
			break;
		case 'INLINECHOICE' :
            // if this is the right answer, then we must replace the claroline tags in the FIB text bye the answer between "[" and "]" :
            $answer_identifier = $exercise_info['question'][$current_question_ident]['correct_answers'][$current_answer_id];
            if ($current_inlinechoice_id == $answer_identifier) {
                $current_question_item_body = str_replace("**claroline_start**" . $current_answer_id . "**claroline_end**", "[" . $data . "]", $current_question_item_body);
            } else {
                if (!isset ($exercise_info['question'][$current_question_ident]['wrong_answers'])) {
                    $exercise_info['question'][$current_question_ident]['wrong_answers'] = array ();
                }
                $exercise_info['question'][$current_question_ident]['wrong_answers'][] = $data;
            }
			break;
	}
}