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

/**
*	Exercise submission
* 	This script allows to run an exercise. According to the exercise type, questions
* 	can be on an unique page, or one per page with a Next button.
*
* 	One exercise may contain different types of answers (unique or multiple selection,
* 	matching, fill in blanks, free answer, hot-spot).
*
* 	Questions are selected randomly or not.
*
* 	When the user has answered all questions and clicks on the button "Ok",
* 	it goes to exercise_result.php
*
* 	Notice : This script is also used to show a question before modifying it by
* 	the administrator
*	@package chamilo.exercise
* 	@author Olivier Brouckaert
* 	@author Julio Montoya <gugli100@gmail.com>
* 			Fill in blank option added (2008)
* 			Cleaning exercises (2010),
* 			Adding hotspot delineation support (2011)
* 			Adding reminder + ajax support (2011)
*   Modified by hubert.borderiou (2011-10-21 question category)
*/

use ChamiloSession as Session;

require_once '../inc/global.inc.php';
$current_course_tool  = TOOL_QUIZ;
$this_section = SECTION_COURSES;
$debug = false;

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

$origin = isset($_REQUEST['origin']) ? Security::remove_XSS($_REQUEST['origin']) : '';

$is_allowedToEdit = api_is_allowed_to_edit(null,true);
$glossaryExtraTools = api_get_setting('show_glossary_in_extra_tools');

$showGlossary = in_array($glossaryExtraTools, array('true', 'exercise', 'exercise_and_lp'));
if ($origin == 'learnpath') {
    $showGlossary = in_array($glossaryExtraTools, array('true', 'lp', 'exercise_and_lp'));
}
if ($showGlossary) {
    $htmlHeadXtra[] = '<script type="text/javascript" src="'.api_get_path(WEB_CODE_PATH).'glossary/glossary.js.php?add_ready=1"></script>';
    $htmlHeadXtra[] = api_get_js('jquery.highlight.js');
}

$htmlHeadXtra[] = api_get_js('jquery.jsPlumb.all.js');
$htmlHeadXtra[] = api_get_js('d3/jquery.xcolor.js');

//This library is necessary for the time control feature
//tmlHeadXtra[] = api_get_css(api_get_path(WEB_LIBRARY_PATH).'javascript/epiclock/stylesheet/jquery.epiclock.css');
$htmlHeadXtra[] = api_get_css(api_get_path(WEB_LIBRARY_PATH).'javascript/epiclock/renderers/minute/epiclock.minute.css');
$htmlHeadXtra[] = api_get_js('epiclock/javascript/jquery.dateformat.min.js');
$htmlHeadXtra[] = api_get_js('epiclock/javascript/jquery.epiclock.min.js');
$htmlHeadXtra[] = api_get_js('epiclock/renderers/minute/epiclock.minute.js');

$template = new Template();

$htmlHeadXtra[] = $template->fetch('default/exercise/submit.js.tpl');

// General parameters passed via POST/GET

$learnpath_id = isset($_REQUEST['learnpath_id']) ? intval($_REQUEST['learnpath_id']) : 0;
$learnpath_item_id = isset($_REQUEST['learnpath_item_id']) ? intval($_REQUEST['learnpath_item_id']) : 0;
$learnpath_item_view_id	= isset($_REQUEST['learnpath_item_view_id']) ? intval($_REQUEST['learnpath_item_view_id']) : 0;

$reminder = isset($_REQUEST['reminder']) ? intval($_REQUEST['reminder']) : 0;
$remind_question_id = isset($_REQUEST['remind_question_id']) ? intval($_REQUEST['remind_question_id']) : 0;
$exerciseId = isset($_REQUEST['exerciseId']) ? intval($_REQUEST['exerciseId']) : 0;

$formSent = isset($_REQUEST['formSent']) ? $_REQUEST['formSent'] : null;
$exerciseResult = isset($_REQUEST['exerciseResult']) ? $_REQUEST['exerciseResult'] : null;
$exerciseResultCoordinates = isset($_REQUEST['exerciseResultCoordinates']) ? $_REQUEST['exerciseResultCoordinates'] : null;

$choice = isset($_REQUEST['choice']) ? $_REQUEST['choice'] : null;
$choice = empty($choice) ? isset($_REQUEST['choice2']) ? $_REQUEST['choice2'] : null : null;

//From submit modal
$current_question = isset($_REQUEST['num']) ? intval($_REQUEST['num']) : null;
$currentAnswer = isset($_REQUEST['num_answer']) ? intval($_REQUEST['num_answer']) : null;

//Error message
$error = '';

//Table calls
$exercise_attempt_table = Database :: get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

/*  Teacher takes an exam and want to see a preview,
    we delete the objExercise from the session in order to get the latest
    changes in the exercise */
if (api_is_allowed_to_edit(null,true) && isset($_GET['preview']) && $_GET['preview'] == 1 ) {
    Session::erase('objExercise');
}

// 1. Loading the $objExercise variable

if (!isset($_SESSION['objExercise']) || $_SESSION['objExercise']->id != $_REQUEST['exerciseId']) {
    // Construction of Exercise
    $objExercise = new Exercise();
    Session::write('firstTime', true);
    if ($debug) {error_log('1. Setting the $objExercise variable'); };
    unset($_SESSION['questionList']);

    // if the specified exercise doesn't exist or is disabled
    if (!$objExercise->read($exerciseId) ||
        (!$objExercise->selectStatus() && !$is_allowedToEdit && $origin != 'learnpath')
    ) {
    	if ($debug) {error_log('1.1. Error while reading the exercise'); };
        unset ($objExercise);
        $error = get_lang('ExerciseNotFound');
    } else {
        // Saves the object into the session
        Session::write('objExercise', $objExercise);
        if ($debug) {error_log('1.1. $_SESSION[objExercise] was unset - set now - end'); };
    }
} else {
    Session::write('firstTime', false);
}

//2. Checking if $objExercise is set
if (!isset($objExercise) && isset($_SESSION['objExercise'])) {
	if ($debug) { error_log('2. Loading $objExercise from session'); };
    $objExercise = $_SESSION['objExercise'];
}

//3. $objExercise is not set, then return to the exercise list
if (!is_object($objExercise)) {
	if ($debug) {error_log('3. $objExercise was not set, kill the script'); };
    header('Location: exercise.php');
    exit;
}

// If reminder ends we jump to the exercise_reminder
if ($objExercise->review_answers) {
    if ($remind_question_id == -1) {
        header('Location: exercise_reminder.php?origin='.$origin.'&exerciseId='.$exerciseId);
        exit;
    }
}

$current_timestamp = time();
$my_remind_list = array();

$time_control = false;
if ($objExercise->expired_time != 0) {
	$time_control = true;
}

// Generating the time control key for the user
$current_expired_time_key = ExerciseLib::get_time_control_key($objExercise->id, $learnpath_id, $learnpath_item_id);

$_SESSION['duration_time'][$current_expired_time_key] = $current_timestamp;

if ($time_control) {
	// Get the expired time of the current exercise in track_e_exercises
	$total_seconds = $objExercise->expired_time*60;
}

$show_clock = true;
$user_id = api_get_user_id();
if ($objExercise->selectAttempts() > 0) {
	$attempt_html = '';
    $attempt_count = Event::get_attempt_count(
        $user_id,
        $exerciseId,
        $learnpath_id,
        $learnpath_item_id,
        $learnpath_item_view_id
    );

	if ($attempt_count >= $objExercise->selectAttempts()) {
		$show_clock = false;
		if (!api_is_allowed_to_edit(null,true)) {
            if ($objExercise->results_disabled == 0 && $origin != 'learnpath') {

                // Showing latest attempt according with task BT#1628
                $exercise_stat_info = Event::getExerciseResultsByUser(
                    $user_id,
                    $exerciseId,
                    api_get_course_id(),
                    api_get_session_id()
                );

                if (!empty($exercise_stat_info)) {
                    $max_exe_id = max(array_keys($exercise_stat_info));
                    $last_attempt_info = $exercise_stat_info[$max_exe_id];
                    $attempt_html .= Display::div(get_lang('Date').': '.api_get_local_time($last_attempt_info['exe_date']), array('id'=>''));

                    $attempt_html .= Display::return_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), 'warning', false);

                    if (!empty($last_attempt_info['question_list'])) {
                        foreach($last_attempt_info['question_list'] as $question_data) {
                            $question_id = $question_data['question_id'];
                            $marks       = $question_data['marks'];

                            $question_info = Question::read($question_id);
                            $attempt_html .= Display::div($question_info->question, array('class'=>'question_title'));
                            $attempt_html .= Display::div(get_lang('Score').' '.$marks, array('id'=>'question_question_titlescore'));
                        }
                    }
					$score =  ExerciseLib::show_score($last_attempt_info['exe_result'], $last_attempt_info['exe_weighting']);
					$attempt_html .= Display::div(get_lang('YourTotalScore').' '.$score, array('id'=>'question_score'));
				} else {
					$attempt_html .= Display::return_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), 'warning', false);
				}
			} else {
				$attempt_html .= Display::return_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), 'warning', false);
			}
		} else {
			$attempt_html .= Display :: return_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), 'warning', false);
		}

		if ($origin == 'learnpath') {
			Display :: display_reduced_header();
		} else {
			Display :: display_header($nameTools,'Exercises');
		}

		echo $attempt_html;
		if ($origin != 'learnpath')
			Display :: display_footer();
		exit;
	}
}

if ($debug) {
    error_log("4. Setting the exe_id: $exe_id");
}

/* 5. Getting user exercise info (if the user took the exam before)
   generating exe_id */
$exercise_stat_info = $objExercise->get_stat_track_exercise_info(
    $learnpath_id,
    $learnpath_item_id,
    $learnpath_item_view_id
);

$clock_expired_time = null;

if (empty($exercise_stat_info)) {
    if ($debug)  error_log('5  $exercise_stat_info is empty ');
	$total_weight = 0;
	$questionList = $objExercise->get_validated_question_list();
	foreach ($questionList as $question_id) {
		$objQuestionTmp = Question::read($question_id);
		$total_weight += floatval($objQuestionTmp->weighting);
	}

	if ($time_control) {
		$expected_time = $current_timestamp + $total_seconds;

		if ($debug)  error_log('5.1. $current_timestamp '.$current_timestamp);
		if ($debug)  error_log('5.2. $expected_time '.$expected_time);

		$clock_expired_time 	= api_get_utc_datetime($expected_time);
		if ($debug) error_log('5.3. $expected_time '.$clock_expired_time);

		//Sessions  that contain the expired time
		$_SESSION['expired_time'][$current_expired_time_key] 	 = $clock_expired_time;
		if ($debug) { error_log('5.4. Setting the $_SESSION[expired_time]: '.$_SESSION['expired_time'][$current_expired_time_key] ); };
	}

    $exe_id = $objExercise->save_stat_track_exercise_info(
        $clock_expired_time,
        $learnpath_id,
        $learnpath_item_id,
        $learnpath_item_view_id,
        $questionList,
        $total_weight
    );
    $exercise_stat_info = $objExercise->get_stat_track_exercise_info(
        $learnpath_id,
        $learnpath_item_id,
        $learnpath_item_view_id
    );
    if ($debug)  error_log("5.5  exercise_stat_info[] exists getting exe_id $exe_id");
} else {
	$exe_id = $exercise_stat_info['exe_id'];
    // Remember last question id position.
    $isFirstTime = Session::read('firstTime');
    if ($isFirstTime && $objExercise->type == ONE_PER_PAGE) {
        $resolvedQuestions = Event::getAllExerciseEventByExeId($exe_id);
        if (!empty($resolvedQuestions) &&
            !empty($exercise_stat_info['data_tracking'])
        ) {
            $last = current(end($resolvedQuestions));
            $attemptQuestionList = explode(',', $exercise_stat_info['data_tracking']);
            $count = 1;
            foreach ($attemptQuestionList as $question) {
                if ($last['question_id'] == $question) {
                    break;
                }
                $count++;
            }
            $current_question = $count;
        }
    }

    if ($debug)  error_log("5  exercise_stat_info[] exists getting exe_id $exe_id ");
}

// Array to check in order to block the chat
ExerciseLib::create_chat_exercise_session($exe_id);

if ($debug) { error_log('6. $objExercise->get_stat_track_exercise_info function called::  '.print_r($exercise_stat_info, 1)); };

if (!empty($exercise_stat_info['questions_to_check'])) {
	$my_remind_list = $exercise_stat_info['questions_to_check'];
	$my_remind_list = explode(',', $my_remind_list);
	$my_remind_list = array_filter($my_remind_list);
}

$params = "exe_id=$exe_id&exerciseId=$exerciseId&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id&learnpath_item_view_id=$learnpath_item_view_id&".api_get_cidreq();
if ($debug) { error_log("6.1 params: ->  $params"); };

if ($reminder == 2 && empty($my_remind_list)) {
    if ($debug) { error_log("6.2 calling the exercise_reminder.php "); };
	header('Location: exercise_reminder.php?'.$params);
	exit;
}

/*
 * 7. Loading Time control parameters
 * If the expired time is major that zero(0) then the expired time is compute on this time.
 */
if ($time_control) {
	if ($debug) error_log('7.1. Time control is enabled');
	if ($debug) error_log('7.2. $current_expired_time_key  '.$current_expired_time_key);
	if ($debug) error_log('7.3. $_SESSION[expired_time][$current_expired_time_key]  '.$_SESSION['expired_time'][$current_expired_time_key]);

    if (!isset($_SESSION['expired_time'][$current_expired_time_key])) {
        //Timer - Get expired_time for a student
        if (!empty($exercise_stat_info)) {
        	if ($debug) {error_log('7.4 Seems that the session ends and the user want to retake the exam'); };
	        $expired_time_of_this_attempt = $exercise_stat_info['expired_time_control'];
			if ($debug) {error_log('7.5 $expired_time_of_this_attempt: '.$expired_time_of_this_attempt); }
	        // Get the last attempt of an exercise
	    	$last_attempt_date = Event::getLastAttemptDateOfExercise($exercise_stat_info['exe_id']);

	    	/* This means that the user enters the exam but do not answer the
	    	   first question we get the date from the track_e_exercises not from
	    	   the track_et_attempt see #2069 */
	    	if (empty($last_attempt_date)) {
	    		$diff = $current_timestamp - api_strtotime($exercise_stat_info['start_date'], 'UTC');
	    		$last_attempt_date = api_get_utc_datetime(api_strtotime($exercise_stat_info['start_date'],'UTC') + $diff);
	    	} else {
	    		//Recalculate the time control due #2069
	    		$diff = $current_timestamp - api_strtotime($last_attempt_date,'UTC');
	    		$last_attempt_date = api_get_utc_datetime(api_strtotime($last_attempt_date,'UTC') + $diff);
	    	}
	        if ($debug) {error_log('7.6. $last_attempt_date: '.$last_attempt_date); }

	        //New expired time - it is due to the possible closure of session
	        $new_expired_time_in_seconds = api_strtotime($expired_time_of_this_attempt, 'UTC') - api_strtotime($last_attempt_date,'UTC');
	        if ($debug) {error_log('7.7. $new_expired_time_in_seconds: '.$new_expired_time_in_seconds); }

	        $expected_time	= $current_timestamp + $new_expired_time_in_seconds;
	        if ($debug) {error_log('7.8. $expected_time1: '.$expected_time); }

	        $clock_expired_time  = api_get_utc_datetime($expected_time);
	        if ($debug) {error_log('7.9. $clock_expired_time: '.$clock_expired_time); }

			// First we update the attempt to today
			/* How the expired time is changed into "track_e_exercises" table,
               then the last attempt for this student should be changed too */
	        $sql = "UPDATE $exercise_attempt_table SET
	                tms = '".api_get_utc_datetime()."'
	                WHERE
	                    exe_id = '".$exercise_stat_info['exe_id']."' AND
	                    tms = '".$last_attempt_date."' ";
	        if ($debug) {error_log('7.10. $sql: '.$sql); }
	        Database::query($sql);

	        //Sessions  that contain the expired time
	        $_SESSION['expired_time'][$current_expired_time_key] = $clock_expired_time;
	        if ($debug) {error_log('7.11. Setting the $_SESSION[expired_time]: '.$_SESSION['expired_time'][$current_expired_time_key] ); };
        }
    } else {
        $clock_expired_time =  $_SESSION['expired_time'][$current_expired_time_key];
    }
} else {
    if ($debug) { error_log("7 No time control"); };
}

// Get time left for expiring time
$time_left = api_strtotime($clock_expired_time,'UTC') - time();

/*
 * The time control feature is enable here - this feature is enable for a jquery plugin called epiclock
 * for more details of how it works see this link : http://eric.garside.name/docs.html?p=epiclock
 */
if ($time_control) { //Sends the exercise form when the expired time is finished
	$htmlHeadXtra[] = $objExercise->show_time_control_js($time_left);
}

// if the user has submitted the form

$exercise_title			= $objExercise->selectTitle();
$exercise_sound 		= $objExercise->selectSound();

//in LP's is enabled the "remember question" feature?

if (!isset($_SESSION['questionList'])) {
    // selects the list of question ID
    $questionList = $objExercise->get_validated_question_list();
    if ($objExercise->isRandom() && !empty($exercise_stat_info['data_tracking'])) {
    	$questionList = explode(',', $exercise_stat_info['data_tracking']);
    }
    Session::write('questionList', $questionList);
    if ($debug > 0) { error_log('$_SESSION[questionList] was set'); }
} else {
	if (isset($objExercise) && isset($_SESSION['objExercise'])) {
    	$questionList = $_SESSION['questionList'];
	}
}

if ($debug) error_log('8. Question list loaded '.print_r($questionList, 1));

//Real question count
$question_count = 0;
if (!empty($questionList)) {
	$question_count = count($questionList);
}

if ($formSent && isset($_POST)) {
    if ($debug) { error_log('9. $formSent was set'); }

    // Initializing
    if (!is_array($exerciseResult)) {
        $exerciseResult = array();
        $exerciseResultCoordinates = array();
    }

    //Only for hotspot
    if (!isset($choice) && isset($_REQUEST['hidden_hotspot_id'])) {
        $hotspot_id = (int)($_REQUEST['hidden_hotspot_id']);
        $choice     = array($hotspot_id => '');
    }

    // if the user has answered at least one question
    if (is_array($choice)) {
        if ($debug) { error_log('9.1. $choice is an array '.print_r($choice, 1)); }
        // Also store hotspot spots in the session ($exerciseResultCoordinates
        // will be stored in the session at the end of this script)

        if (isset($_POST['hotspot'])) {
            $exerciseResultCoordinates = $_POST['hotspot'];
            if ($debug) { error_log('9.2. $_POST[hotspot] data '.print_r($exerciseResultCoordinates, 1)); }
        }
        if ($objExercise->type == ALL_ON_ONE_PAGE) {
            // $exerciseResult receives the content of the form.
            // Each choice of the student is stored into the array $choice
            $exerciseResult = $choice;
        } else {
            // gets the question ID from $choice. It is the key of the array
            list ($key) = array_keys($choice);
            // if the user didn't already answer this question
            if (!isset($exerciseResult[$key])) {
                // stores the user answer into the array
                $exerciseResult[$key] = $choice[$key];
                //saving each question
                if ($objExercise->feedback_type != EXERCISE_FEEDBACK_TYPE_DIRECT) {
                    $nro_question = $current_question; // - 1;
                 	$questionId   = $key;
                    // gets the student choice for this question
                    $choice = $exerciseResult[$questionId];
                    if (isset($exe_id)) {
                    	// Manage the question and answer attempts
                        if ($debug) { error_log('8.3. manage_answer exe_id: '.$exe_id.' - $questionId: '.$questionId.' Choice'.print_r($choice,1)); }
                        $objExercise->manage_answer(
                            $exe_id,
                            $questionId,
                            $choice,
                            'exercise_show',
                            $exerciseResultCoordinates,
                            true,
                            false,
                            false,
                            $objExercise->propagate_neg,
                            array()
                        );
                    }
                    //END of saving and qualifying
                }
            }
        }
        if ($debug) { error_log('9.3.  $choice is an array - end'); }
        if ($debug) { error_log('9.4.  $exerciseResult '.print_r($exerciseResult,1)); }
    }

    // the script "exercise_result.php" will take the variable $exerciseResult from the session
    Session::write('exerciseResult', $exerciseResult);
    Session::write('remind_list', $remind_list);
    Session::write('exerciseResultCoordinates',$exerciseResultCoordinates);

    // if all questions on one page OR if it is the last question (only for an exercise with one question per page)
    if ($objExercise->type == ALL_ON_ONE_PAGE || $current_question >= $question_count) {
        if (api_is_allowed_to_session_edit()) {
            // goes to the script that will show the result of the exercise
            if ($objExercise->type == ALL_ON_ONE_PAGE) {
                if ($debug) { error_log('10. Exercise ALL_ON_ONE_PAGE -> Redirecting to exercise_result.php'); }

                //We check if the user attempts before sending to the exercise_result.php
                if ($objExercise->selectAttempts() > 0) {
                    $attempt_count = Event::get_attempt_count(
                        api_get_user_id(),
                        $exerciseId,
                        $learnpath_id,
                        $learnpath_item_id,
                        $learnpath_item_view_id
                    );
                    if ($attempt_count >= $objExercise->selectAttempts()) {
                        Display :: display_warning_message(
                            sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()),
                            false
                        );
                        if ($origin != 'learnpath') {
                            //so we are not in learnpath tool
                            echo '</div>'; //End glossary div
                            Display :: display_footer();
                        } else {
                            echo '</body></html>';
                        }
                    }
                }
                header("Location: exercise_result.php?".api_get_cidreq()."&exe_id=$exe_id&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id&learnpath_item_view_id=$learnpath_item_view_id");
                exit;
            } else {
                if ($debug) { error_log('10. Redirecting to exercise_show.php'); }
                header("Location: exercise_result.php?".api_get_cidreq()."&exe_id=$exe_id&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id&learnpath_item_view_id=$learnpath_item_view_id");
                exit;
            }
        } else {
            if ($debug) { error_log('10. Redirecting to exercise_submit.php'); }
            header("Location: exercise_submit.php?".api_get_cidreq()."&exerciseId=$exerciseId&origin=$origin");
            exit;
        }
    }
    if ($debug) { error_log('11. $formSent was set - end'); }
} else {
    if ($debug) { error_log('9. $formSent was NOT sent'); }
}

// If questionNum comes from POST and not from GET
if (!$current_question || isset($_REQUEST['num']) && $_REQUEST['num']) {
    if (!$current_question) {
        $current_question = 1;
    } else {
        $current_question++;
    }
}

if ($question_count != 0) {
	if (($objExercise->type == ALL_ON_ONE_PAGE ||
        $current_question > $question_count)
    ) {
	    if (api_is_allowed_to_session_edit()) {
	        // goes to the script that will show the result of the exercise
	        if ($objExercise->type == ALL_ON_ONE_PAGE) {
	            if ($debug) { error_log('12. Exercise ALL_ON_ONE_PAGE -> Redirecting to exercise_result.php'); }

	            //We check if the user attempts before sending to the exercise_result.php
	            if ($objExercise->selectAttempts() > 0) {
	                $attempt_count = Event::get_attempt_count(
                        api_get_user_id(),
                        $exerciseId,
                        $learnpath_id,
                        $learnpath_item_id,
                        $learnpath_item_view_id
                    );
	                if ($attempt_count >= $objExercise->selectAttempts()) {
	                    Display :: display_warning_message(
                            sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()),
                            false
                        );
	                    if ($origin != 'learnpath') {
	                        //so we are not in learnpath tool
	                        echo '</div>'; //End glossary div
	                        Display :: display_footer();
	                    } else {
	                        echo '</body></html>';
	                    }
	                    exit;
	                }
	            }
	        } else {
	            if ($objExercise->review_answers) {
	            	header('Location: exercise_reminder.php?'.$params);
	            	exit;
	            } else {
                    header("Location: exercise_result.php?".api_get_cidreq()."&exe_id=$exe_id&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id&learnpath_item_view_id=$learnpath_item_view_id");
                    exit;
	            }
	        }
	    } else {
	        if ($debug) { error_log('Redirecting to exercise_submit.php'); }
	        exit;
	    }
	}
} else {
	$error = get_lang('ThereAreNoQuestionsForThisExercise');
	// if we are in the case where user select random by category, but didn't choose the number of random question
	if ($objExercise->selectRandomByCat() > 0 && $objExercise->random <= 0) {
		$error .= "<br/>".get_lang('PleaseSelectSomeRandomQuestion');
	}
}

if (!empty ($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
    $_SESSION['gradebook'] = Security :: remove_XSS($_GET['gradebook']);
    $gradebook = $_SESSION['gradebook'];
} elseif (empty ($_GET['gradebook'])) {
    unset ($_SESSION['gradebook']);
    $gradebook = '';
}

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

$interbreadcrumb[] = array ("url" => "exercise.php?".api_get_cidreq(),	"name" => get_lang('Exercises'));
$interbreadcrumb[] = array ("url" => "#", "name" => $objExercise->name);

if ($origin != 'learnpath') { //so we are not in learnpath tool
    Display :: display_header(null,'Exercises');
    if (!api_is_allowed_to_session_edit() ) {
        Display :: display_warning_message(get_lang('SessionIsReadOnly'));
    }
} else {
    Display::display_reduced_header();
    echo '<div style="height:10px">&nbsp;</div>';
}

$show_quiz_edition = $objExercise->added_in_lp();

// I'm in a preview mode
if (api_is_course_admin() && $origin != 'learnpath') {
    echo '<div class="actions">';
    if ($show_quiz_edition == false) {
    	echo '<a href="exercise_admin.php?' . api_get_cidreq() . '&modifyExercise=yes&exerciseId=' . $objExercise->id . '">'.Display :: return_icon('settings.png', get_lang('ModifyExercise'),'',ICON_SIZE_MEDIUM).'</a>';
    } else {
    	echo '<a href="#">'.Display::return_icon('settings_na.png', get_lang('ModifyExercise'),'',ICON_SIZE_MEDIUM).'</a>';
    }
    echo '</div>';
}

$is_visible_return = $objExercise->is_visible(
    $learnpath_id,
    $learnpath_item_id,
    $learnpath_item_view_id
);
if ($is_visible_return['value'] == false) {
    echo $is_visible_return['message'];
    if ($origin != 'learnpath') {
        Display :: display_footer();
    }
    exit;
}

$limit_time_exists = (($objExercise->start_time != '0000-00-00 00:00:00') || ($objExercise->end_time != '0000-00-00 00:00:00')) ? true : false;

if ($limit_time_exists) {
    $exercise_start_time = api_strtotime($objExercise->start_time, 'UTC');
    $exercise_end_time = api_strtotime($objExercise->end_time, 'UTC');
    $time_now = time();

    if ($objExercise->start_time != '0000-00-00 00:00:00') {
        $permission_to_start = (($time_now - $exercise_start_time) > 0) ? true : false;
    } else {
        $permission_to_start = true;
    }
    if ($_SERVER['REQUEST_METHOD'] != 'POST') {
        if ($objExercise->end_time != '0000-00-00 00:00:00') {
            $exercise_timeover = (($time_now - $exercise_end_time) > 0) ? true : false;
        } else {
            $exercise_timeover = false;
        }
    }

    if (!$permission_to_start || $exercise_timeover) {
        if (!api_is_allowed_to_edit(null,true)) {
            $message_warning = $permission_to_start ? get_lang('ReachedTimeLimit') : get_lang('ExerciseNoStartedYet');
            Display :: display_warning_message(sprintf($message_warning, $exercise_title, $objExercise->selectAttempts()));
            if ($origin != 'learnpath') {
            	Display :: display_footer();
            }
            exit;
        } else {
            $message_warning = $permission_to_start ? get_lang('ReachedTimeLimitAdmin') : get_lang('ExerciseNoStartedAdmin');
            Display :: display_warning_message(sprintf($message_warning, $exercise_title, $objExercise->selectAttempts()));
        }
    }
}

// Blocking empty start times see BT#2800
global $_custom;
if (isset($_custom['exercises_hidden_when_no_start_date']) &&
    $_custom['exercises_hidden_when_no_start_date']
) {
	if (empty($objExercise->start_time) || $objExercise->start_time == '0000-00-00 00:00:00') {
        Display:: display_warning_message(
            sprintf(
                get_lang('ExerciseNoStartedYet'),
                $exercise_title,
                $objExercise->selectAttempts()
            )
        );
		if ($origin != 'learnpath') {
			Display :: display_footer();
		}
	}
}

//Timer control
if ($time_control) {
    echo $objExercise->return_time_left_div();
	echo '<div style="display:none" class="warning-message" id="expired-message-id">'.get_lang('ExerciseExpiredTimeMessage').'</div>';
}

if (!empty($objExercise->description)) {
    echo "<script>
        $(function() {
            $('#description_content').accordion({
                changestart: function(event, ui) {
                    //var clicked = $(this).find('.ui-state-active').attr('id');
                    //$('#'+clicked).load('/widgets/'+clicked);
                    $('#collapse1').html(".json_encode($objExercise->description).");
                }
            });
         });
        </script>";
    echo Display::generate_accordion(array(array('title' => get_lang('ExerciseDescriptionLabel'), 'content' => $objExercise->description)), 'jquery', 'description_content');
}

if ($origin != 'learnpath') {
   echo '<div id="highlight-plugin" class="glossary-content">';
}

if ($reminder == 2)  {
    if ($debug) { error_log(' $reminder == 2'); }

    $data_tracking  = $exercise_stat_info['data_tracking'];
    $data_tracking  = explode(',', $data_tracking);

    $current_question = 1; //set by default the 1st question

    if (!empty($my_remind_list)) {
    	//Checking which questions we are going to call from the remind list
		for ($i = 0; $i < count($data_tracking); $i++) {
			for($j = 0; $j < count($my_remind_list); $j++) {

				if (!empty($remind_question_id)) {
					if ($remind_question_id == $my_remind_list[$j]) {

			        	if ($remind_question_id == $data_tracking[$i]) {
			        		if (isset($my_remind_list[$j+1])) {
			        			$remind_question_id = $my_remind_list[$j+1];
			        			$current_question = $i + 1;
			        		} else {
                                // We end the remind list we go to the exercise_reminder.php please
			        			$remind_question_id = -1;
			        			$current_question = $i + 1; // last question
			        		}
			        		break 2;
			            }
					}
				} else {
					if ($my_remind_list[$j] == $data_tracking[$i]) {
						if (isset($my_remind_list[$j+1])) {
							$remind_question_id = $my_remind_list[$j+1];
							$current_question = $i + 1; // last question
						} else {
                            // We end the remind list we go to the exercise_reminder.php please
							$remind_question_id = -1;
							$current_question = $i + 1; // last question
						}
						break 2;
					}
				}
			}
        }
    } else {
    	if ($objExercise->review_answers) {
            if ($debug) { error_log('. redirecting to exercise_reminder.php '); }
	    	header("Location: exercise_reminder.php?$params");
	    	exit;
    	}
    }
}

if ($objExercise->review_answers) {
	$script_php = 'exercise_reminder.php';
} else {
	$script_php = 'exercise_result.php';
}

if (!empty($error)) {
    Display :: display_error_message($error, false);
} else {
    if (!empty ($exercise_sound)) {
        echo "<a href=\"../document/download.php?doc_url=%2Faudio%2F" . Security::remove_XSS($exercise_sound) . "\" target=\"_blank\">", "<img src=\"../img/sound.gif\" border=\"0\" align=\"absmiddle\" alt=", get_lang('Sound') . "\" /></a>";
    }
    // Get number of hotspot questions for javascript validation
    $number_of_hotspot_questions = 0;
    $onsubmit = '';
    $i = 0;
    if (!empty($questionList)) {
        foreach ($questionList as $questionId) {
            $i++;
            $objQuestionTmp = Question::read($questionId);
            // for sequential exercises

            if ($objExercise->type == ONE_PER_PAGE) {
                // if it is not the right question, goes to the next loop iteration
                if ($current_question != $i) {
                    continue;
                } else {
                    if ($objQuestionTmp->selectType() == HOT_SPOT || $objQuestionTmp->selectType() == HOT_SPOT_DELINEATION) {
                        $number_of_hotspot_questions++;
                    }
                    break;
                }
            } else {
                if ($objQuestionTmp->selectType() == HOT_SPOT || $objQuestionTmp->selectType() == HOT_SPOT_DELINEATION) {
                    $number_of_hotspot_questions++;
                }
            }
        }
    }

    if ($number_of_hotspot_questions > 0) {
        $onsubmit = "onsubmit=\"return validateFlashVar('" . $number_of_hotspot_questions . "', '" . get_lang('HotspotValidateError1') . "', '" . get_lang('HotspotValidateError2') . "');\"";
    }

    echo '<script>
        $(function() {

            // Block form submition on enter
            $(".block_on_enter").keypress(function(event) {
                return event.keyCode != 13;
            });

            $(".main_question").mouseover(function() {
                //$(this).find(".exercise_save_now_button").show();
                //$(this).addClass("question_highlight");
            });

            $(".main_question").mouseout(function() {
                //$(this).find(".exercise_save_now_button").hide();
                $(this).removeClass("question_highlight");
            });

            $(".no_remind_highlight").hide();

            // if the users validates the form using return key, prevent form action and simulates click on validation button
            /*$("#exercise_form").submit(function(){
                $(".question-validate-btn").first().trigger("click");
                return false;
            });*/
        });

		function previous_question(question_num) {
			url = "exercise_submit.php?'.$params.'&num="+question_num;
			window.location = url;
		}

        function previous_question_and_save(previous_question_id, question_id_to_save) {
            url = "exercise_submit.php?'.$params.'&num="+previous_question_id;
            //Save the current question
            save_now(question_id_to_save, url);
        }

        function save_question_list(question_list) {
            $.each(question_list, function(key, question_id) {
                save_now(question_id, null, false);
            });

            var url = "";
            if ('.$reminder.' == 1 ) {
                url = "exercise_reminder.php?'.$params.'&num='.$current_question.'";
            } else if ('.$reminder.' == 2 ) {
                url = "exercise_submit.php?'.$params.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'&reminder=2";
            } else {
                url = "exercise_submit.php?'.$params.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'";
            }
            //$("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('save.png', get_lang('Saved'), array(), ICON_SIZE_SMALL)).'");
            window.location = url;
        }

        function save_now(question_id, url_extra) {
            //1. Normal choice inputs
            var my_choice = $(\'*[name*="choice[\'+question_id+\']"]\').serialize();

            //2. Reminder checkbox
            var remind_list = $(\'*[name*="remind_list"]\').serialize();

            //3. Hotspots
            var hotspot = $(\'*[name*="hotspot[\'+question_id+\']"]\').serialize();

            // Checking FCK
            if (question_id) {
                if (CKEDITOR.instances["choice["+question_id+"]"]) {
                    var ckContent = CKEDITOR.instances["choice["+question_id+"]"].getData();
                    my_choice = {};
                    my_choice["choice["+question_id+"]"] = ckContent;
                    my_choice = $.param(my_choice);
                }
            }

            if ($(\'input[name="remind_list[\'+question_id+\']"]\').is(\':checked\')) {
                $("#question_div_"+question_id).addClass("remind_highlight");
            } else {
                $("#question_div_"+question_id).removeClass("remind_highlight");
            }

            // Only for the first time

            $("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('loading1.gif')).'");
            $.ajax({
                type:"post",
                async: false,
                url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?'.api_get_cidreq().'&a=save_exercise_by_now",
                data: "'.$params.'&type=simple&question_id="+question_id+"&"+my_choice+"&"+hotspot+"&"+remind_list,
                success: function(return_value) {
                    if (return_value == "ok") {
                        $("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('save.png', get_lang('Saved'), array(), ICON_SIZE_SMALL)).'");
                    } else if (return_value == "error") {
                        $("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('error.png', get_lang('Error'), array(), ICON_SIZE_SMALL)).'");
                    } else if (return_value == "one_per_page") {
                        var url = "";
                        if ('.$reminder.' == 1 ) {
                            url = "exercise_reminder.php?'.$params.'&num='.$current_question.'";
                        } else if ('.$reminder.' == 2 ) {
                            url = "exercise_submit.php?'.$params.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'&reminder=2";
                        } else {
                            url = "exercise_submit.php?'.$params.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'";
                        }

                        if (url_extra) {
                            url = url_extra;
                        }

                        $("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('save.png', get_lang('Saved'), array(), ICON_SIZE_SMALL)).'");

                        window.location = url;
                    }
                },
                error: function() {
                    $("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('error.png', get_lang('Error'), array(), ICON_SIZE_SMALL)).'");
                }
            });
            return false;
        }

        function save_now_all(validate) {
            // 1. Input choice.
            var my_choice = $(\'*[name*="choice"]\').serialize();

            // 2. Reminder.
            var remind_list = $(\'*[name*="remind_list"]\').serialize();

            // 3. Hotspots.
            var hotspot = $(\'*[name*="hotspot"]\').serialize();

            // Question list.
            var question_list = ['.implode(',', $questionList).'];

            var free_answers = {};

            $.each(question_list, function(index, my_question_id) {
                // Checking FCK
                if (my_question_id) {
                    if (CKEDITOR.instances["choice["+my_question_id+"]"]) {
                        var ckContent = CKEDITOR.instances["choice["+my_question_id+"]"].getData();
                        free_answers["free_choice["+my_question_id+"]"] = ckContent;
                    }
                }
            });

            free_answers = $.param(free_answers);

            $("#save_all_reponse").html("'.addslashes(Display::return_icon('loading1.gif')).'");

            $.ajax({
                type:"post",
                async: false,
                url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?'.api_get_cidreq().'&a=save_exercise_by_now",
                data: "'.$params.'&type=all&"+my_choice+"&"+hotspot+"&"+free_answers+"&"+remind_list,
                success: function(return_value) {
                    if (return_value == "ok") {
                        //$("#save_all_reponse").html("'.addslashes(Display::return_icon('accept.png')).'");
                        if (validate == "validate") {
                            window.location = "'.$script_php.'?'.$params.'";
                        } else {
                            $("#save_all_reponse").html("'.addslashes(Display::return_icon('accept.png')).'");
                        }
                    } else {
                        $("#save_all_reponse").html("'.addslashes(Display::return_icon('wrong.gif')).'");
                    }
                }
            });
            return false;
        }

        function validate_all() {
            save_now_all("validate");
            return false;
        }
    </script>';

    echo '<form id="exercise_form" method="post" action="'.api_get_self().'?'.api_get_cidreq().'&autocomplete=off&&exerciseId='.$exerciseId .'" name="frm_exercise" '.$onsubmit.'>
         <input type="hidden" name="formSent"				value="1" />
         <input type="hidden" name="exerciseId" 			value="'.$exerciseId . '" />
         <input type="hidden" name="num" 					value="'.$current_question.'" id="num_current_id" />
         <input type="hidden" name="num_answer"             value="'.$currentAnswer.'" id="num_current_answer_id" />
         <input type="hidden" name="exe_id" 				value="'.$exe_id . '" />
         <input type="hidden" name="origin" 				value="'.$origin . '" />
         <input type="hidden" name="learnpath_id" 			value="'.$learnpath_id . '" />
         <input type="hidden" name="learnpath_item_id" 		value="'.$learnpath_item_id . '" />
         <input type="hidden" name="learnpath_item_view_id" value="'.$learnpath_item_view_id . '" />';

	// Show list of questions
    $i = 1;

    $attempt_list = array();

    if (isset($exe_id)) {
        $attempt_list = Event::getAllExerciseEventByExeId($exe_id);
    }

    $remind_list  = array();
    if (isset($exercise_stat_info['questions_to_check']) && !empty($exercise_stat_info['questions_to_check'])) {
        $remind_list = explode(',', $exercise_stat_info['questions_to_check']);
    }

    foreach ($questionList as $questionId) {

        // for sequential exercises
        if ($objExercise->type == ONE_PER_PAGE) {
            // if it is not the right question, goes to the next loop iteration
            if ($current_question != $i) {
                $i++;
                continue;
            } else {
                if ($objExercise->feedback_type != EXERCISE_FEEDBACK_TYPE_DIRECT) {
                    // if the user has already answered this question
                    if (isset($exerciseResult[$questionId])) {
                        // construction of the Question object
                        $objQuestionTmp = Question::read($questionId);
                        $questionName = $objQuestionTmp->selectTitle();
                        // destruction of the Question object
                        unset ($objQuestionTmp);
                        Display :: display_normal_message(get_lang('AlreadyAnswered'));
                        $i++;
                        break;
                    }
                }
            }
        }

        $user_choice = isset($attempt_list[$questionId]) ? $attempt_list[$questionId] : null;

        $remind_highlight = '';

        //Hides questions when reviewing a ALL_ON_ONE_PAGE exercise see #4542 no_remind_highlight class hide with jquery
        if ($objExercise->type == ALL_ON_ONE_PAGE && isset($_GET['reminder']) && $_GET['reminder'] == 2) {
            $remind_highlight = 'no_remind_highlight';
        }

        $exercise_actions  = '';
        $is_remind_on = false;

        $attributes = array('id' =>'remind_list['.$questionId.']');
        if (in_array($questionId, $remind_list)) {
        	$is_remind_on = true;
        	$attributes['checked'] = 1;
        	$remind_question = true;
        	$remind_highlight = ' remind_highlight ';
        }

        // Showing the question

        echo '<div id="question_div_'.$questionId.'" class="main-question '.$remind_highlight.'" >';

        // Shows the question and its answers
        ExerciseLib::showQuestion($questionId, false, $origin, $i, true, false, $user_choice, false);

        // Button save and continue
        switch ($objExercise->type) {
            case ONE_PER_PAGE:
                $exercise_actions .= $objExercise->show_button($questionId, $current_question);
                break;
            case ALL_ON_ONE_PAGE :
                $button  = '<a href="javascript://" class="btn btn-info" onclick="save_now(\''.$questionId.'\'); ">'.get_lang('SaveForNow').'</a>';
                $button .= '<span id="save_for_now_'.$questionId.'"></span>&nbsp;';
                $exercise_actions  .= Display::div($button, array('class'=>'exercise_save_now_button'));
                break;
        }

        // Checkbox review answers
        if ($objExercise->review_answers) {
            $remind_question_div = Display::tag(
                'label',
                Display::input(
                    'checkbox',
                    'remind_list[' . $questionId . ']',
                    '',
                    $attributes
                ) . get_lang('ReviewQuestionLater'),
                array(
                    'class' => 'checkbox',
                    'for' => 'remind_list[' . $questionId . ']'
                )
            );
            $exercise_actions .= Display::div($remind_question_div, array('class'=>'exercise_save_now_button'));
        }
        echo Display::div($exercise_actions, array('class'=>'form-actions'));
        echo '</div>';

        $i++;
        // for sequential exercises
        if ($objExercise->type == ONE_PER_PAGE) {
            // quits the loop
            break;
        }
    }
    // end foreach()
    if ($objExercise->type == ALL_ON_ONE_PAGE) {
    	$exercise_actions =  $objExercise->show_button($questionId, $current_question);
    	echo Display::div($exercise_actions, array('class'=>'exercise_actions'));
    }
    echo '</form>';
    echo '</div>';
}

if ($origin != 'learnpath') {
    // So we are not in learnpath tool
    echo '</div>'; //End glossary div
    Display :: display_footer();
} else {
    echo '</body></html>';
}
