<?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)
*/
/**
 * Code
 */
require_once 'exercise.class.php';
require_once 'question.class.php';
require_once 'answer.class.php';
require_once 'exercise.lib.php';

$debug = 1; //debug value is set in the exercise.class.php file

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

require_once '../inc/global.inc.php';

$this_section = SECTION_COURSES;

if ($debug) { error_log('--- Enter to the exercise_submit.php ---- '); error_log('0. POST variables : '.print_r($_POST,1)); }

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

$is_allowedToEdit = api_is_allowed_to_edit(null,true);

$htmlHeadXtra[] = api_get_jquery_js();

if (api_get_setting('show_glossary_in_extra_tools') == 'true') {
    $htmlHeadXtra[] = api_get_js('glossary.js'); //Glossary
    $htmlHeadXtra[] = api_get_js('jquery.highlight.js'); //highlight
}

//This library is necessary for the time control feature
$htmlHeadXtra[] = api_get_js('jquery.epiclock.min.js');

// General parameters passed via POST/GET
if (empty ($origin)) {
    $origin = Security::remove_XSS($_REQUEST['origin']);
}
if (empty ($learnpath_id)) {
    $learnpath_id = intval($_REQUEST['learnpath_id']);
}
if (empty ($learnpath_item_id)) {
    $learnpath_item_id = intval($_REQUEST['learnpath_item_id']);
}
if (empty ($learnpath_item_view_id)) {
    $learnpath_item_view_id = intval($_REQUEST['learnpath_item_view_id']);
}
if (empty ($formSent)) {
    $formSent = $_REQUEST['formSent'];
}
if (empty($exerciseResult)) {
    $exerciseResult = $_REQUEST['exerciseResult'];
}
if (empty ($exerciseResultCoordinates)) {
	$exerciseResultCoordinates = $_REQUEST['exerciseResultCoordinates'];
}
if (empty ($exerciseId)) {
    $exerciseId = intval($_REQUEST['exerciseId']);
}
if (empty($choice)) {	
    $choice = $_REQUEST['choice'];    
}
if (empty($_REQUEST['choice'])) {	
    $choice = $_REQUEST['choice2'];    
}
if (empty ($questionNum)) {
    $questionNum = intval($_REQUEST['questionNum']);
}
if (empty ($current_question)) {
    $current_question = intval($_REQUEST['num']);
}

//Error message
$error = '';

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

$safe_lp_id             = ($learnpath_id == '')             ? 0 : $learnpath_id;
$safe_lp_item_id        = ($learnpath_item_id == '')        ? 0 : $learnpath_item_id;
$safe_lp_item_view_id   = ($learnpath_item_view_id == '')   ? 0 : $learnpath_item_view_id;

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

//Table calls
$stat_table 			= Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
$exercice_attemp_table 	= Database :: get_statistic_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) && $_GET['preview'] == 1 ) {
    api_session_unregister('objExercise');
}

// 1. Loading the $objExercise variable

if (!isset($_SESSION['objExercise']) || $_SESSION['objExercise']->id != $_REQUEST['exerciseId']) {    
    // Construction of Exercise
    $objExercise = new Exercise();   
    if ($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);
        $error = get_lang('ExerciseNotFound');
    } else {
        // Saves the object into the session
        api_session_register('objExercise');
        if ($debug) {error_log('1.1. $_SESSION[objExercise] was unset - set now - end'); };        
    }    
}

//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: exercice.php');
    exit;
}

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

//4. Setting the exe_id (attempt id)
/*
$exe_id = null;
if (isset($_SESSION['exe_id'])) {
	$exe_id = $_SESSION['exe_id'];
}*/

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

if ($time_control) {
	//Get the expired time of the current exercice in track_e_exercices
	$total_seconds 			= $objExercise->expired_time*60;
	
	//Generating the time control key for the user
	$current_expired_time_key = generate_time_control_key($objExercise->id);
}

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 = $objExercise->get_stat_track_exercise_info($safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id);

if (empty($exercise_stat_info)) {
	$total_weight = 0;
	$questionList = $objExercise->get_validated_question_list();
	foreach($questionList as $question_id) {
		$objQuestionTmp = Question::read($question_id);
		$total_weight += floatval($objQuestionTmp->weighting);
	}
	$clock_expired_time = '';
	if ($time_control) {
		$expected_time = $current_timestamp + $total_seconds;
		
		if ($debug)  error_log('6.3. $current_timestamp '.$current_timestamp);
		if ($debug)  error_log('6.4. $expected_time '.$expected_time);
		
		$clock_expired_time 	= api_get_utc_datetime($expected_time);
		if ($debug) error_log('6.5. $expected_time '.$clock_expired_time);
		
		//Sessions  that contain the expired time
		$_SESSION['expired_time'][$current_expired_time_key] 	 = $clock_expired_time;
		if ($debug) {
			error_log('6.6. Setting the $_SESSION[expired_time]: '.$_SESSION['expired_time'][$current_expired_time_key] );
		};
	}
	$exe_id = $objExercise->save_stat_track_exercise_info($clock_expired_time, $safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id, $questionList, $total_weight);
	$exercise_stat_info = $objExercise->get_stat_track_exercise_info($safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id);	
} else {
	$exe_id = $exercise_stat_info['exe_id'];
}

if ($debug) { error_log('5. $objExercise->get_stat_track_exercise_info function called::  '.print_r($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='.$learnpath_item_view_id;
if ($debug) { error_log("5.1 params: ->  $params"); };

if ($reminder == 2 && empty($my_remind_list)) {	
	header('Location: exercise_reminder.php?'.$params);
	exit;
}

/*
 * 6. Loading Time control parameters
 * If the expired time is major that zero(0) then the expired time is compute on this time. Disable for learning path
 */

if ($time_control) {
	if ($debug) error_log('6.1. Time control is enabled');	
	if ($debug) {error_log('6.2. $current_expired_time_key  '.$current_expired_time_key); };
	if ($debug) { error_log('6.2. $_SESSION[expired_time][$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('6.3 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('$expired_time_of_this_attempt: '.$expired_time_of_this_attempt); }			
	        //Get the last attempt of an exercice
	    	$last_attempt_date = get_last_attempt_date_of_exercise($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('6.4. $last_attempt_date: '.$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('6.5. $new_expired_time_in_seconds: '.$new_expired_time_in_seconds); }	        
	        
	        $expected_time	= $current_timestamp + $new_expired_time_in_seconds;
	        if ($debug) {error_log('6.6. $expected_time1: '.$expected_time); }
	        	        			
	        $clock_expired_time  = api_get_utc_datetime($expected_time);
	        if ($debug) {error_log('6.7. $clock_expired_time: '.$clock_expired_time); }
	        	              		
			// First we update the attempt to today
			// How the expired time is changed into "track_e_exercices" table,then the last attempt for this student should be changed too,so
	        $sql_track_e_exe = "UPDATE $exercice_attemp_table SET tms = '".api_get_utc_datetime()."' WHERE exe_id = '".$exercise_stat_info['exe_id']."' AND tms = '".$last_attempt_date."' ";
	        if ($debug) {error_log('6.8. $sql_track_e_exe2: '.$sql_track_e_exe); }
	        Database::query($sql_track_e_exe);
	        	
	        //Sessions  that contain the expired time
	        $_SESSION['expired_time'][$current_expired_time_key] 		= $clock_expired_time;
	        if ($debug) {error_log('6.9. Setting the $_SESSION[expired_time]: '.$_SESSION['expired_time'][$current_expired_time_key] ); };
        }
    } else {
        $clock_expired_time =  $_SESSION['expired_time'][$current_expired_time_key];
    }
}

// Get time left for exipiring 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 exercice form when the expired time is finished	
	$htmlHeadXtra[] = $objExercise->show_time_control_js($time_left);
}

/*
if ($objExercise->type == ONE_PER_PAGE && $objExercise->feedbacktype != EXERCISE_FEEDBACK_TYPE_DIRECT) {	
	if (!empty($exercise_stat_info)) {
        $exe_id = $exercise_stat_info['exe_id'];
        if ($_SERVER['REQUEST_METHOD'] != 'POST') {            
            $recorded['questionList'] = explode(',', $exercise_stat_info['data_tracking']);            
            $query = 'SELECT * FROM ' . $exercice_attemp_table . ' WHERE exe_id = ' . $exercise_stat_info['exe_id'] . ' ORDER BY tms ASC';            
            $result = Database::query($query);
            while ($row = Database :: fetch_array($result,'ASSOC')) {
                $recorded['exerciseResult'][$row['question_id']] = 1;
            }
            $exerciseResult = $_SESSION['exerciseResult'] = $recorded['exerciseResult'];            
            $current_question = count($recorded['exerciseResult']);
            $current_question++;
            $questionList = $_SESSION['questionList'] = $recorded['questionList'];
        }
    }
}*/
// if the user has submitted the form

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

//if (!isset($_SESSION['questionList']) || $origin == 'learnpath') {
//in LP's is enabled the "remember question" feature?

if (!isset($_SESSION['questionList'])) {    
    // selects the list of question ID        
    $questionList = $objExercise->get_validated_question_list();
    api_session_register('questionList');    
    if ($debug > 0) { error_log('$_SESSION[questionList] was set'); }
} else {	
	if (isset($objExercise) && isset($_SESSION['objExercise'])) {		
    	$questionList = $_SESSION['questionList'];
	}
}

if ($debug) error_log('7 Question list loaded '.print_r($questionList, 1));

$quizStartTime = time();
api_session_register('quizStartTime');

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

if ($formSent && isset($_POST)) {
    if ($debug > 0) { error_log('8. $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('8.1. $choice is an array '.print_r($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('8.2. $_POST[hotspot] data '.print_r($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->feedbacktype != 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 > 0) { 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, $objExercise->propagate_neg);
                    }
                    //END of saving and qualifying
                }
            }
        }
        if ($debug > 0) { error_log('8.3.  $choice is an array - end'); }
        if ($debug > 0) { error_log('8.4.  $exerciseResult '.print_r($exerciseResult,1)); }
    }
    
    
    // the script "exercise_result.php" will take the variable $exerciseResult from the session
    api_session_register('exerciseResult');
    api_session_register('remind_list');     
    api_session_register('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('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 = get_attempt_count(api_get_user_id(), $exerciseId, $safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id);                
                    if ($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?origin=$origin&learnpath_id=$safe_lp_id&learnpath_item_id=$safe_lp_item_id&learnpath_item_view_id=$safe_lp_item_view_id");
                exit;
            } else {
                //Time control is only enabled for ONE PER PAGE
                if (!empty($exe_id) && is_numeric($exe_id)) {
                    //Verify if the current test is fraudulent
                    if (exercise_time_control_is_valid($exerciseId)) {
                    	$sql_exe_result = "";                    	
                        if ($debug) { error_log('exercise_time_control_is_valid is valid'); }
                    } else {
                    	$sql_exe_result = ", exe_result = 0";
                        if ($debug) { error_log('exercise_time_control_is_valid is NOT valid then exe_result = 0 '); }
                    }
                    /*
                    //Clean incomplete - @todo why setting to blank the status?                  
                    $update_query = "UPDATE $stat_table SET  status = '', exe_date = '".api_get_utc_datetime() ."' , orig_lp_item_view_id = '$safe_lp_item_view_id' $sql_exe_result  WHERE exe_id = ".$exe_id;
                    
                    if ($debug) { error_log('Updating track_e_exercises '.$update_query); }                    
                    Database::query($update_query);*/
                }                
                if ($debug) { error_log('Redirecting to exercise_show.php'); }
                //header("Location: exercise_show.php?id=$exe_id&origin=$origin&learnpath_id=$safe_lp_id&learnpath_item_id=$safe_lp_item_id&learnpath_item_view_id=$safe_lp_item_view_id");
                header("Location: exercise_result.php?exe_id=$exe_id&origin=$origin&learnpath_id=$safe_lp_id&learnpath_item_id=$safe_lp_item_id&learnpath_item_view_id=$safe_lp_item_view_id");
                exit;
            }            
        } else {
            if ($debug) { error_log('Redirecting to exercise_submit.php'); }
            header("Location: exercise_submit.php?exerciseId=$exerciseId&origin=$origin");
            exit;            
        }
    }
    
    if (!empty($remind_list)) {
         //header("Location: exercise_reminder.php?origin=$origin&learnpath_id=$safe_lp_id&learnpath_item_id=$safe_lp_item_id&learnpath_item_view_id=$safe_lp_item_view_id");
         exit;
    }
    if ($debug > 0) { error_log('$formSent was set - end'); }
}

// if questionNum comes from POST and not from GET

if (!$current_question || $_REQUEST['num']) {
    if (!$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('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 = get_attempt_count(api_get_user_id(), $exerciseId, $safe_lp_id, $safe_lp_item_id, $safe_lp_item_view_id);                
	                if ($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;
	                }
	            }             
	            //header("Location: exercise_result.php?origin=$origin&learnpath_id=$safe_lp_id&learnpath_item_id=$safe_lp_item_id&learnpath_item_view_id=$safe_lp_item_view_id");
	            //exit;
	        } else {
	        	
	            //Time control is only enabled for ONE PER PAGE        	
	            if (!empty($exe_id) && is_numeric($exe_id)) {
	                //Verify if the current test is fraudulent
	            	$check = exercise_time_control_is_valid($exerciseId);
	            
	                if ($check) {
	                	$sql_exe_result = "";                    	
	                    if ($debug) { error_log('exercise_time_control_is_valid is valid'); }
	                } else {
	                	$sql_exe_result = ", exe_result = 0";
	                    if ($debug) { error_log('exercise_time_control_is_valid is NOT valid then exe_result = 0 '); }
	                }
	                /*
	                //Clean incomplete - @todo why setting to blank the status?                  
	                $update_query = "UPDATE $stat_table SET  status = '', exe_date = '".api_get_utc_datetime() ."' , orig_lp_item_view_id = '$safe_lp_item_view_id' $sql_exe_result  WHERE exe_id = ".$exe_id;
	                
	                //if ($debug) { error_log('Updating track_e_exercises '.$update_query); }                    
	                Database::query($update_query);*/
	            }                           
	            header('Location: exercise_reminder.php?'.$params);
	            exit;
	            //header("Location: exercise_submit.php?exerciseId=$exerciseId");
	        }            
	    } else {
	        if ($debug) { error_log('Redirecting to exercise_submit.php'); }
	        //header("Location: exercise_submit.php?exerciseId=$exerciseId");
	        exit;            
	    }
	}
} else {
	$error = get_lang('QuestionNotFound');
}

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'));
}

$interbreadcrumb[] = array ("url" => "exercice.php?gradebook=$gradebook",	"name" => get_lang('Exercices'));
$interbreadcrumb[] = array ("url" => "#","name" => $objExercise->name);

if ($origin != 'learnpath') { //so we are not in learnpath tool  
    Display :: display_header($nameTools,'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() && $origin != 'learnpath') {
    echo '<div class="actions">';
    //echo '<a href="exercice.php?show=test&id_session='.api_get_session_id().'">' . Display :: return_icon('back.png', get_lang('BackToExercisesList'),'','32').'</a>';
    if ($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'),'','32').'</a>';
        //echo Display :: return_icon('wizard.gif', get_lang('QuestionList')) . '<a href="exercice/admin.php?' . api_get_cidreq() . '&exerciseId=' . $objExercise->id . '">' . get_lang('QuestionList') . '</a>';
    } else {
    	echo '<a href="#">'.Display::return_icon('settings_na.png', get_lang('ModifyExercise'),'','32').'</a>';
    }
    echo '</div>';
}
/*
$exercise_header = Display::div($exercise_title, array('class'=>'exercise_title'));
if (!empty($exercise_description)) {
	$exercise_header .= Display::div($exercise_description, array('class'=>'exercise_description'));
}
echo Display::div($exercise_header, array('class'=>'exercise_header'));*/

$show_clock = true;
$user_id = api_get_user_id();
if ($objExercise->selectAttempts() > 0) {	
	$attempt_count = get_attempt_count($user_id, $exerciseId, $safe_lp_id, $safe_lp_item_id, $safe_lp_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
                $exercise_stat_info = get_exercise_results_by_user($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];
                    echo Display::div(get_lang('Date').': '.api_get_local_time($last_attempt_info['exe_date']), array('id'=>''));
                    
                    Display::display_warning_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), 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);                                                        
                            echo Display::div($question_info->question, array('class'=>'question_title'));                            
                            echo Display::div(get_lang('Score').' '.$marks, array('id'=>'question_score'));
                        }
                    }                    
                    $score =  show_score($last_attempt_info['exe_result'], $last_attempt_info['exe_weighting']);
                    echo Display::div(get_lang('YourTotalScore').' '.$score, array('id'=>'question_score'));                    
                } else {
                    Display :: display_warning_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), false);	
                }
            } else {
                Display :: display_warning_message(sprintf(get_lang('ReachedMaxAttempts'), $exercise_title, $objExercise->selectAttempts()), false);
            }            
            if ($origin != 'learnpath')
                Display :: display_footer();
            exit;
        } else {            
            Display :: display_warning_message(sprintf(get_lang('ReachedMaxAttemptsAdmin'), $exercise_title, $objExercise->selectAttempts()), false);
        }
    }
}

$limit_time_exists = (($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()));
            exit;
        }
    }
}

// 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 '<div align="left" id="wrapper-clock"><div id="square" class="rounded"><div id="text-content" align="center" class="count_down"></div></div></div>';
	echo '<div style="display:none" class="warning-message" id="expired-message-id">'.get_lang('ExerciceExpiredTimeMessage').'</div>';
}

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

//var_dump('$remind_question_id . '.$remind_question_id);

if ($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 {			        			
			        			$remind_question_id = -1; //We end the remind list we go to the exercise_reminder.php please			        			
			        			$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 {
							$remind_question_id = -1; //We end the remind list we go to the exercise_reminder.php please
							$current_question = $i + 1; // last question
						}						
						break 2;
					}
				}
			}  
        }
    } else {    	
    	header("Location: exercise_reminder.php?$params");
    	exit;
    }
    //var_dump($remind_question_id, $my_remind_list, $data_tracking, $current_question);
}


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 = '';
    $i = 0;
    //i have a doubt in this line cvargas
    //var_dump($questionList);
    if (!strcmp($questionList[0], '') === 0) {
        foreach ($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>
    		
    		$(function() {    		
    			//$(".exercise_save_now_button").hide();
    			    			
    		    $(".main_question").mouseover(function() {
    		    	//$(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");
                });
    		});		

    		
			function previous_question(question_num) {
				lp_data = $.param({"exe_id": '.$exe_id.'});
				url = "exercise_submit.php?origin='.$origin.'&exerciseId='.$exerciseId.'&num="+question_num+"&" + lp_data;																
				window.location = url;
			}
    		
           function save_now(question_id) {
           		//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 (typeof(FCKeditorAPI) !== "undefined") {
    				var oEditor = FCKeditorAPI.GetInstance("choice["+question_id+"]") ;
    				var fck_content = "";
    				
    				if (oEditor) {          		
               			fck_content = oEditor.GetHTML();
               			my_choice = {};
               			my_choice["choice["+question_id+"]"] = fck_content;  
               			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
           		lp_data = $.param({"exe_id": '.$exe_id.'});
           		
           		
          		$("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('loading1.gif')).'");                                
                    $.ajax({ 
                        url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?a=save_exercise_by_now",
                        data: "type=simple&question_id="+question_id+"&"+my_choice+"&"+hotspot+"&"+lp_data+"&"+remind_list,                                 
                        success: function(return_value) {
                        	if (return_value == "ok") {
                        		$("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('accept.png', get_lang('Ok'), array(), 22)).'");
                        	} else if (return_value == "error") {
                        		$("#save_for_now_"+question_id).html("'.addslashes(Display::return_icon('error.png', get_lang('Error'), array(), 22)).'");
                        	} else if (return_value == "one_per_page") {
                        		var url = "";                        	
								if ('.$reminder.' == 1 ) {
                        			url = "exercise_reminder.php?'.$params.'&num='.$current_question.'";
								} else if ('.$reminder.' == 2 ) {
									url = "exercise_submit.php?origin='.$origin.'&exerciseId='.$exerciseId.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'&reminder=2&" + lp_data;
								} else {
									url = "exercise_submit.php?origin='.$origin.'&exerciseId='.$exerciseId.'&num='.$current_question.'&remind_question_id='.$remind_question_id.'&" + lp_data;
								}								
								window.location = url;
								
                        	}
                        },                                 
                    });   
                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 (typeof(FCKeditorAPI) !== "undefined") {
               			var oEditor = FCKeditorAPI.GetInstance("choice["+my_question_id+"]") ;
        				var fck_content = "";    				
        				if (oEditor) {           				   		
                   			fck_content = oEditor.GetHTML();
                   			//alert(index + "  " +my_question_id + " " +fck_content);
                   		 	free_answers["free_choice["+my_question_id+"]"] = fck_content;               		 	
                   		}
               		}           			
           		});           		
           		//lok+(fgt)= data base
           		free_answers = $.param(free_answers);				
           		                 		
           		lp_data = $.param({"exe_id": '.$exe_id.'});    		
           		
          		$("#save_all_reponse").html("'.addslashes(Display::return_icon('loading1.gif')).'");
          		                             
                $.ajax({ 
                    url: "'.api_get_path(WEB_AJAX_PATH).'exercise.ajax.php?a=save_exercise_by_now",
                    data: "type=all&"+my_choice+"&"+hotspot+"&"+lp_data+"&"+free_answers+"&"+remind_list,                                 
                    success: function(return_value) {
                    	if (return_value == "ok") {                                  
                    		//$("#save_all_reponse").html("'.addslashes(Display::return_icon('accept.png')).'");
                    		if (validate == "validate") {
                            	window.location = "exercise_reminder.php?'.$params.'&" + lp_data;
                            } 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&gradebook='.$gradebook."&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 . '" />
         <input type="hidden" name="exe_id" 				value="'.$exe_id . '" />
         <input type="hidden" name="origin" 				value="'.$origin . '" />
         <input type="hidden" name="learnpath_id" 			value="'.$safe_lp_id . '" />
         <input type="hidden" name="learnpath_item_id" 		value="'.$safe_lp_item_id . '" />
         <input type="hidden" name="learnpath_item_view_id" value="'.$safe_lp_item_view_id . '" />';
                        
	//Show list of questions
    $i = 1;
    
    $attempt_list = array();
    
    if (isset($exe_id)) {        
        $attempt_list = get_all_exercise_event_by_exe_id($exe_id);
    }
    
    if (!empty($attempt_list) && $current_question == 1) {
        Display::display_normal_message(get_lang('YouTriedToResolveThisExerciseEarlier'));
    }
    
    $remind_list  = array();
    if (isset($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->feedbacktype != 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 = $attempt_list[$questionId];	   

        $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
	        showQuestion($questionId, false, $origin, $i, true, false, $user_choice);
	        	        
	        if ($objExercise->type == ONE_PER_PAGE) {
	        	$exercise_actions .= $objExercise->show_button($questionId, $current_question);
	        }
	        
	        if ($objExercise->type == ALL_ON_ONE_PAGE) {
	            $button  = '<a href="javascript://" class="a_button orange medium" onclick="save_now(\''.$questionId.'\'); ">'.get_lang('SaveForNow').'</a>';
	            $button .= '<span id="save_for_now_'.$questionId.'"></span>&nbsp;';
	            $exercise_actions  .= Display::span($button, array('class'=>'exercise_save_now_button'));                			      
			}		
			
			$remind_question_div  = Display::input('checkbox', 'remind_list['.$questionId.']',  '', $attributes);
			$remind_question_div .= Display::tag('label', get_lang('ReviewQuestionLater'), array('for' =>'remind_list['.$questionId.']'));
			$exercise_actions    .= Display::span($remind_question_div, array('class'=>'exercise_save_now_button'));		
			
			echo Display::div($exercise_actions, array('class'=>'exercise_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>';
}
if ($origin != 'learnpath') {
    //so we are not in learnpath tool
    echo '</div>'; //End glossary div
    Display :: display_footer();
} else {
    echo '</body></html>';
}