<?php
/* For licensing terms, see /license.txt */
/**
*	Exercise administration
* 	This script allows to manage (create, modify) an exercise and its questions
*
*	 Following scripts are includes for a best code understanding :
*
* 	- exercise.class.php : for the creation of an Exercise object
* 	- question.class.php : for the creation of a Question object
* 	- answer.class.php : for the creation of an Answer object
* 	- exercise.lib.php : functions used in the exercise tool
* 	- exercise_admin.inc.php : management of the exercise
* 	- question_admin.inc.php : management of a question (statement & answers)
* 	- statement_admin.inc.php : management of a statement
* 	- answer_admin.inc.php : management of answers
* 	- question_list_admin.inc.php : management of the question list
*
* 	Main variables used in this script :
*
* 	- $is_allowedToEdit : set to 1 if the user is allowed to manage the exercise
* 	- $objExercise : exercise object
* 	- $objQuestion : question object
* 	- $objAnswer : answer object
* 	- $aType : array with answer types
* 	- $exerciseId : the exercise ID
* 	- $picturePath : the path of question pictures
* 	- $newQuestion : ask to create a new question
* 	- $modifyQuestion : ID of the question to modify
* 	- $editQuestion : ID of the question to edit
* 	- $submitQuestion : ask to save question modifications
* 	- $cancelQuestion : ask to cancel question modifications
* 	- $deleteQuestion : ID of the question to delete
* 	- $moveUp : ID of the question to move up
* 	- $moveDown : ID of the question to move down
* 	- $modifyExercise : ID of the exercise to modify
* 	- $submitExercise : ask to save exercise modifications
* 	- $cancelExercise : ask to cancel exercise modifications
* 	- $modifyAnswers : ID of the question which we want to modify answers for
* 	- $cancelAnswers : ask to cancel answer modifications
* 	- $buttonBack : ask to go back to the previous page in answers of type "Fill in blanks"
*
*	@package chamilo.exercise
* 	@author Olivier Brouckaert
* Modified by Hubert Borderiou 21-10-2011 Question by category
*/

use \ChamiloSession as Session;

require_once 'exercise.class.php';
require_once 'question.class.php';
require_once 'answer.class.php';

// Name of the language file that needs to be included
$language_file = 'exercice';

require_once '../inc/global.inc.php';
require_once 'exercise.lib.php';
$current_course_tool  = TOOL_QUIZ;
$this_section = SECTION_COURSES;

// Access control
api_protect_course_script(true);

$is_allowedToEdit = api_is_allowed_to_edit(null,true);
$sessionId = api_get_session_id();

if (!$is_allowedToEdit) {
	api_not_allowed(true);
}

require_once api_get_path(LIBRARY_PATH).'fileUpload.lib.php';
require_once api_get_path(LIBRARY_PATH).'document.lib.php';
/*  stripslashes POST data  */
if($_SERVER['REQUEST_METHOD'] == 'POST') {
	foreach($_POST as $key=>$val) {
		if(is_string($val)) {
			$_POST[$key]=stripslashes($val);
		} elseif(is_array($val)) {
			foreach($val as $key2=>$val2) {
				$_POST[$key][$key2]=stripslashes($val2);
			}
		}
		$GLOBALS[$key]=$_POST[$key];
	}
}

if (empty($exerciseId)) {
    $exerciseId = isset($_GET['exerciseId']) ? intval($_GET['exerciseId']):'0';
}
if (empty($newQuestion)) {
    $newQuestion = isset($_GET['newQuestion']) ? $_GET['newQuestion'] : 0;
}
if (empty($modifyAnswers)) {
    $modifyAnswers = isset($_GET['modifyAnswers']) ? $_GET['modifyAnswers'] : 0;
}
if (empty($editQuestion)) {
    $editQuestion = isset($_GET['editQuestion']) ? $_GET['editQuestion'] : 0;
}
if (empty($modifyQuestion)) {
    $modifyQuestion = isset($_GET['modifyQuestion']) ? $_GET['modifyQuestion'] : 0;
}
if (empty($deleteQuestion)) {
    $deleteQuestion = isset($_GET['deleteQuestion']) ? $_GET['deleteQuestion'] : 0;
}
$clone_question = isset($_REQUEST['clone_question']) ? $_REQUEST['clone_question'] : 0;
if (empty($questionId)) {
    $questionId = isset($_SESSION['questionId']) ? $_SESSION['questionId'] : 0;
}
if (empty($modifyExercise)) {
    $modifyExercise = isset($_GET['modifyExercise']) ? $_GET['modifyExercise'] : null;
}

$fromExercise = isset($fromExercise) ? $fromExercise : null;
$cancelExercise = isset($cancelExercise) ? $cancelExercise : null;
$cancelAnswers = isset($cancelAnswers) ? $cancelAnswers : null;
$modifyIn = isset($modifyIn) ? $modifyIn : null;
$cancelQuestion = isset($cancelQuestion) ? $cancelQuestion : null;

/* Cleaning all incomplete attempts of the admin/teacher to avoid weird problems
    when changing the exercise settings, number of questions, etc */

delete_all_incomplete_attempts(api_get_user_id(), $exerciseId, api_get_course_id(), api_get_session_id());

// get from session
$objExercise = isset($_SESSION['objExercise']) ? $_SESSION['objExercise'] : null;
$objQuestion = isset($_SESSION['objQuestion']) ? $_SESSION['objQuestion'] : null;
$objAnswer   = isset($_SESSION['objAnswer']) ? $_SESSION['objAnswer'] : null;

// document path
$documentPath = api_get_path(SYS_COURSE_PATH).$_course['path'].'/document';

// picture path
$picturePath = $documentPath.'/images';

// audio path
$audioPath = $documentPath.'/audio';

// the 5 types of answers
$aType = array(
    get_lang('UniqueSelect'),
    get_lang('MultipleSelect'),
    get_lang('FillBlanks'),
    get_lang('Matching'),
    get_lang('FreeAnswer')
);

// tables used in the exercise tool

if (!empty($_GET['action']) && $_GET['action'] == 'exportqti2' && !empty($_GET['questionId'])) {
    require_once 'export/qti2/qti2_export.php';
    $export = export_question($_GET['questionId'], true);
    $qid = (int)$_GET['questionId'];
    $archive_path = api_get_path(SYS_ARCHIVE_PATH);
    $temp_dir_short = uniqid();
    $temp_zip_dir = $archive_path."/".$temp_dir_short;
    if (!is_dir($temp_zip_dir)) {
        mkdir($temp_zip_dir, api_get_permissions_for_new_directories());
    }
    $temp_zip_file = $temp_zip_dir."/".api_get_unique_id().".zip";
    $temp_xml_file = $temp_zip_dir."/qti2export_".$qid.'.xml';
    file_put_contents($temp_xml_file, $export);
    $zip_folder = new PclZip($temp_zip_file);
    $zip_folder->add($temp_xml_file, PCLZIP_OPT_REMOVE_ALL_PATH);
    $name = 'qti2_export_'.$qid.'.zip';

    DocumentManager::file_send_for_download($temp_zip_file, true, $name);
    unlink($temp_zip_file);
    unlink($temp_xml_file);
    rmdir($temp_zip_dir);
    //DocumentManager::string_send_for_download($export,true,'qti2export_q'.$_GET['questionId'].'.xml');
    exit; //otherwise following clicks may become buggy
}

// Exercise object creation.
if (!is_object($objExercise)) {
	// construction of the Exercise object
	$objExercise = new Exercise();

	// creation of a new exercise if wrong or not specified exercise ID
	if ($exerciseId) {
	    $objExercise->read($exerciseId);
	}
	// saves the object into the session
	Session::write('objExercise', $objExercise);
}

// Exercise can be edited in their course.
if ($objExercise->sessionId != $sessionId) {
    api_not_allowed(true);
    /*header('Location: '.api_get_path(WEB_CODE_PATH).'exercice/exercice.php?'.api_get_cidreq());
    exit;*/
}

// doesn't select the exercise ID if we come from the question pool
if (!$fromExercise) {
	// gets the right exercise ID, and if 0 creates a new exercise
	if (!$exerciseId = $objExercise->selectId()) {
		$modifyExercise='yes';
	}
}

$nbrQuestions = $objExercise->selectNbrQuestions();

// Question object creation.
if ($editQuestion || $newQuestion || $modifyQuestion || $modifyAnswers) {
	if ($editQuestion || $newQuestion) {

		// reads question data
		if ($editQuestion) {
			// question not found
			if (!$objQuestion = Question::read($editQuestion)) {
				api_not_allowed();
			}
			// saves the object into the session
			Session::write('objQuestion',$objQuestion);
		}
	}

	// checks if the object exists
	if(is_object($objQuestion)) {
		// gets the question ID
		$questionId = $objQuestion->selectId();
	}
}

// if cancelling an exercise
if ($cancelExercise) {
	// existing exercise
	if($exerciseId) {
		unset($modifyExercise);
	} else {
        // new exercise
		// goes back to the exercise list
		header('Location: '.api_get_path(WEB_CODE_PATH).'exercice/exercice.php?'.api_get_cidreq());
		exit();
	}
}

// if cancelling question creation/modification
if ($cancelQuestion) {
	// if we are creating a new question from the question pool
	if(!$exerciseId && !$questionId) {
		// goes back to the question pool
		header('Location: question_pool.php');
		exit();
	} else {
		// goes back to the question viewing
		$editQuestion=$modifyQuestion;
		unset($newQuestion,$modifyQuestion);
	}
}

if (!empty($clone_question) && !empty($objExercise->id)) {
	$old_question_obj = Question::read($clone_question);
	$old_question_obj->question = $old_question_obj->question.' - '.get_lang('Copy');

	$new_id = $old_question_obj->duplicate();
	$new_question_obj = Question::read($new_id);
	$new_question_obj->addToList($exerciseId);

	// This should be moved to the duplicate function
	$new_answer_obj = new Answer($clone_question);
	$new_answer_obj->read();
	$new_answer_obj->duplicate($new_id);

    //Reloading tne $objExercise obj
    $objExercise->read($objExercise->id);

	header('Location: admin.php?'.api_get_cidreq().'&exerciseId='.$objExercise->id);
	exit;
}

// if cancelling answer creation/modification
if ($cancelAnswers) {
	// goes back to the question viewing
	$editQuestion=$modifyAnswers;
	unset($modifyAnswers);
}
$nameTools = null;
// modifies the query string that is used in the link of tool name
if ($editQuestion || $modifyQuestion || $newQuestion || $modifyAnswers) {
	$nameTools = get_lang('QuestionManagement');
}

if (isset($_SESSION['gradebook'])){
	$gradebook=	$_SESSION['gradebook'];
}

if (!empty($gradebook) && $gradebook=='view') {
	$interbreadcrumb[]= array(
        'url' => '../gradebook/'.$_SESSION['gradebook_dest'],
        'name' => get_lang('ToolGradebook')
    );
}

$interbreadcrumb[] = array("url" => "exercice.php","name" => get_lang('Exercices'));
if (isset($_GET['newQuestion']) || isset($_GET['editQuestion']) ) {
    $interbreadcrumb[] = array("url" => "admin.php?exerciseId=".$objExercise->id, "name" => $objExercise->name);
} else {
    $interbreadcrumb[] = array("url" => "#", "name" => $objExercise->name);
}

// shows a link to go back to the question pool
if (!$exerciseId && $nameTools != get_lang('ExerciseManagement')){
	$interbreadcrumb[]=array(
        "url" => api_get_path(WEB_CODE_PATH)."exercice/question_pool.php?fromExercise=$fromExercise&".api_get_cidreq(),
        "name" => get_lang('QuestionPool')
    );
}

// if the question is duplicated, disable the link of tool name
if ($modifyIn == 'thisExercise') {
	if($buttonBack)	{
		$modifyIn='allExercises';
	} else {
		$noPHP_SELF=true;
	}
}
$htmlHeadXtra[] = '<script>

function multiple_answer_true_false_onchange(variable) {
    var result = variable.checked;
    var id = variable.id;
    var weight_id = "weighting_" + id;
    var array_result=new Array();
    array_result[1]="1";
    array_result[0]= "-0.50";
    array_result[-1]= "0";
    if (result) {
        result = 1;
    } else {
        result = 0;
    }
    document.getElementById(weight_id).value = array_result[result];
}


</script>';

$htmlHeadXtra[] = "<script type=\"text/javascript\" src=\"../plugin/hotspot/JavaScriptFlashGateway.js\"></script>
<script src=\"../plugin/hotspot/hotspot.js\" type=\"text/javascript\"></script>
<script language=\"JavaScript\" type=\"text/javascript\">
<!--
// -----------------------------------------------------------------------------
// Globals
// Major version of Flash required
var requiredMajorVersion = 7;
// Minor version of Flash required
var requiredMinorVersion = 0;
// Minor version of Flash required
var requiredRevision = 0;
// the version of javascript supported
var jsVersion = 1.0;
// -----------------------------------------------------------------------------
// -->
</script>
<script language=\"VBScript\" type=\"text/vbscript\">
<!-- // Visual basic helper required to detect Flash Player ActiveX control version information
Function VBGetSwfVer(i)
  on error resume next
  Dim swControl, swVersion
  swVersion = 0

  set swControl = CreateObject(\"ShockwaveFlash.ShockwaveFlash.\" + CStr(i))
  if (IsObject(swControl)) then
    swVersion = swControl.GetVariable(\"\$version\")
  end if
  VBGetSwfVer = swVersion
End Function
// -->
</script>

<script language=\"JavaScript1.1\" type=\"text/javascript\">
<!-- // Detect Client Browser type
var isIE  = (navigator.appVersion.indexOf(\"MSIE\") != -1) ? true : false;
var isWin = (navigator.appVersion.toLowerCase().indexOf(\"win\") != -1) ? true : false;
var isOpera = (navigator.userAgent.indexOf(\"Opera\") != -1) ? true : false;
jsVersion = 1.1;
// JavaScript helper required to detect Flash Player PlugIn version information
function JSGetSwfVer(i){
	// NS/Opera version >= 3 check for Flash plugin in plugin array
	if (navigator.plugins != null && navigator.plugins.length > 0) {
		if (navigator.plugins[\"Shockwave Flash 2.0\"] || navigator.plugins[\"Shockwave Flash\"]) {
			var swVer2 = navigator.plugins[\"Shockwave Flash 2.0\"] ? \" 2.0\" : \"\";
      		var flashDescription = navigator.plugins[\"Shockwave Flash\" + swVer2].description;
			descArray = flashDescription.split(\" \");
			tempArrayMajor = descArray[2].split(\".\");
			versionMajor = tempArrayMajor[0];
			versionMinor = tempArrayMajor[1];
			if ( descArray[3] != \"\" ) {
				tempArrayMinor = descArray[3].split(\"r\");
			} else {
				tempArrayMinor = descArray[4].split(\"r\");
			}
      		versionRevision = tempArrayMinor[1] > 0 ? tempArrayMinor[1] : 0;
            flashVer = versionMajor + \".\" + versionMinor + \".\" + versionRevision;
      	} else {
			flashVer = -1;
		}
	}
	// MSN/WebTV 2.6 supports Flash 4
	else if (navigator.userAgent.toLowerCase().indexOf(\"webtv/2.6\") != -1) flashVer = 4;
	// WebTV 2.5 supports Flash 3
	else if (navigator.userAgent.toLowerCase().indexOf(\"webtv/2.5\") != -1) flashVer = 3;
	// older WebTV supports Flash 2
	else if (navigator.userAgent.toLowerCase().indexOf(\"webtv\") != -1) flashVer = 2;
	// Can't detect in all other cases
	else {

		flashVer = -1;
	}
	return flashVer;
}
// When called with reqMajorVer, reqMinorVer, reqRevision returns true if that version or greater is available
function DetectFlashVer(reqMajorVer, reqMinorVer, reqRevision)
{
 	reqVer = parseFloat(reqMajorVer + \".\" + reqRevision);
   	// loop backwards through the versions until we find the newest version
	for (i=25;i>0;i--) {
		if (isIE && isWin && !isOpera) {
			versionStr = VBGetSwfVer(i);
		} else {
			versionStr = JSGetSwfVer(i);
		}
		if (versionStr == -1 ) {
			return false;
		} else if (versionStr != 0) {
			if(isIE && isWin && !isOpera) {
				tempArray         = versionStr.split(\" \");
				tempString        = tempArray[1];
				versionArray      = tempString .split(\",\");
			} else {
				versionArray      = versionStr.split(\".\");
			}
			versionMajor      = versionArray[0];
			versionMinor      = versionArray[1];
			versionRevision   = versionArray[2];

			versionString     = versionMajor + \".\" + versionRevision;   // 7.0r24 == 7.24
			versionNum        = parseFloat(versionString);
        	// is the major.revision >= requested major.revision AND the minor version >= requested minor
			if ( (versionMajor > reqMajorVer) && (versionNum >= reqVer) ) {
				return true;
			} else {
				return ((versionNum >= reqVer && versionMinor >= reqMinorVer) ? true : false );
			}
		}
	}
}
// -->
</script>";

Display::display_header($nameTools,'Exercise');
/*
if ($objExercise->exercise_was_added_in_lp) {
    if ($objExercise->force_edit_exercise_in_lp == true) {
        Display::display_warning_message(get_lang('ForceEditingExerciseInLPWarning'));
    } else {
        Display::display_warning_message(get_lang('EditingExerciseCauseProblemsInLP'));
    }
}*/

// If we are in a test
$inATest = isset($exerciseId) && $exerciseId > 0;

if ($inATest) {
    echo '<div class="actions">';
    if (isset($_GET['hotspotadmin']) || isset($_GET['newQuestion']) || isset($_GET['myid']))
        echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/admin.php?exerciseId='.$exerciseId.'&'.api_get_cidReq().'">'.
            Display::return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';

    if (!isset($_GET['hotspotadmin']) && !isset($_GET['newQuestion']) && !isset($_GET['myid']) &&  !isset($_GET['editQuestion'])) {
        echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/exercice.php?'.api_get_cidReq().'">'.
            Display::return_icon('back.png', get_lang('BackToExercisesList'),'',ICON_SIZE_MEDIUM).'</a>';
    }
    echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/overview.php?'.api_get_cidreq().'&exerciseId='.$objExercise->id.'&preview=1">'.
        Display::return_icon('preview_view.png', get_lang('Preview'),'',ICON_SIZE_MEDIUM).'</a>';

    echo Display::url(
        Display::return_icon('test_results.png', get_lang('Results'),'',ICON_SIZE_MEDIUM),
        api_get_path(WEB_CODE_PATH).'exercice/exercise_report.php?'.api_get_cidReq().'&exerciseId='.$objExercise->id
    );

    echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/exercise_admin.php?'.api_get_cidreq().'&modifyExercise=yes&exerciseId='.$objExercise->id.'">'.
        Display::return_icon('settings.png', get_lang('ModifyExercise'),'',ICON_SIZE_MEDIUM).'</a>';

    $maxScoreAllQuestions = 0;
    if (!empty($objExercise->questionList)) {
        foreach ($objExercise->questionList as $q) {
            $question = Question::read($q);
            if ($question) {
                $maxScoreAllQuestions += $question->selectWeighting();
            }
        }
    }
    echo '<span style="float:right">'.sprintf(get_lang('XQuestionsWithTotalScoreY'), $objExercise->selectNbrQuestions(), $maxScoreAllQuestions).'</span>';
    echo '</div>';
} else if (isset($_GET['newQuestion'])) {
	// we are in create a new question from question pool not in a test
	echo '<div class="actions">';
	echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/admin.php?'.api_get_cidreq().'">'.
        Display::return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';
	echo '</div>';
} else {
	// If we are in question_pool but not in an test, go back to question create in pool
	echo '<div class="actions">';
	echo '<a href="'.api_get_path(WEB_CODE_PATH).'exercice/question_pool.php?'.api_get_cidreq().'">'.
        Display::return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).
        '</a>';
	echo '</div>';
}

if (isset($_GET['message'])) {
	if (in_array($_GET['message'], array('ExerciseStored', 'ItemUpdated', 'ItemAdded'))) {
		Display::display_confirmation_message(get_lang($_GET['message']));
	}
}

if ($newQuestion || $editQuestion) {
	// statement management
	$type = isset($_REQUEST['answerType']) ? Security::remove_XSS($_REQUEST['answerType']) : null;
	echo '<input type="hidden" name="Type" value="'.$type.'" />';

    if ($newQuestion == 'yes') {
        $objExercise->edit_exercise_in_lp = true;
    }

	require 'question_admin.inc.php';
}

if (isset($_GET['hotspotadmin'])) {
    if (!is_object($objQuestion)) {
        $objQuestion = Question :: read($_GET['hotspotadmin']);
    }
    if (!$objQuestion) {
        api_not_allowed();
    }
	require 'hotspot_admin.inc.php';
}

if (!$newQuestion && !$modifyQuestion && !$editQuestion && !isset($_GET['hotspotadmin'])) {
	// question list management
	require 'question_list_admin.inc.php';
}

// if we are in question authoring, display warning to user is feedback not shown at the end of the test -ref #6619
// this test to display only message in the question authoring page and not in the question list page too
// if (is_object($objQuestion) && $objExercise->selectFeedbackType() == EXERCISE_FEEDBACK_TYPE_EXAM && ($newQuestion || $modifyQuestion || $editQuestion)) {
if ($objExercise->selectFeedbackType() == EXERCISE_FEEDBACK_TYPE_EXAM) {
    Display::display_normal_message(get_lang("TestFeedbackNotShown"));
}

Session::write('objExercise', $objExercise);
Session::write('objQuestion', $objQuestion);
Session::write('objAnswer', $objAnswer);
Display::display_footer();