<?php
// $Id: exercice_submit.php 22201 2009-07-17 19:57:03Z cfasanando $

/*
==============================================================================
	Dokeos - elearning and course management software

	Copyright (c) 2004-2008 Dokeos SPRL
	Copyright (c) 2003 Ghent University (UGent)
	Copyright (c) 2001 Universite catholique de Louvain (UCL)
	Copyright (c) various contributors

	For a full list of contributors, see "credits.txt".
	The full license can be read in "license.txt".

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	See the GNU General Public License for more details.

	Contact address: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium
	Mail: info@dokeos.com
==============================================================================
*/

/**
*	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 dokeos.exercise
* 	@author Olivier Brouckaert
* 	@author Julio Montoya multiple fill in blank option added
* 	@version $Id: exercice_submit.php 22201 2009-07-17 19:57:03Z cfasanando $
*/

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

// debug var. Set to 0 to hide all debug display. Set to 1 to display debug messages.
$debug = 0;
/*
// answer types
define('UNIQUE_ANSWER',		1);
define('MULTIPLE_ANSWER',	2);
define('FILL_IN_BLANKS',	3);
define('MATCHING',			4);
define('FREE_ANSWER', 		5);
define('HOT_SPOT', 			6);
define('HOT_SPOT_ORDER', 	7);
*/
// name of the language file that needs to be included
$language_file = 'exercice';

require_once '../inc/global.inc.php';
$this_section = SECTION_COURSES;

/* ------------	ACCESS RIGHTS ------------ */
// notice for unauthorized people.
api_protect_course_script(true);

require_once api_get_path(LIBRARY_PATH) . 'text.lib.php';

$is_allowedToEdit = api_is_allowed_to_edit();

$_configuration['live_exercise_tracking'] = true;
$stat_table = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
$exercice_attemp_table = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

$TBL_EXERCICE_QUESTION = Database :: get_course_table(TABLE_QUIZ_TEST_QUESTION);
$TBL_EXERCICES = Database :: get_course_table(TABLE_QUIZ_TEST);
$TBL_QUESTIONS = Database :: get_course_table(TABLE_QUIZ_QUESTION);
$TBL_REPONSES = Database :: get_course_table(TABLE_QUIZ_ANSWER);

// general parameters passed via POST/GET

if (empty ($origin)) {
	$origin = $_REQUEST['origin'];
}
if (empty ($learnpath_id)) {
	$learnpath_id = Security::remove_XSS($_REQUEST['learnpath_id']);
}
if (empty ($learnpath_item_id)) {
	$learnpath_item_id = Security::remove_XSS($_REQUEST['learnpath_item_id']);
}
if (empty ($formSent)) {
	$formSent = $_REQUEST['formSent'];
}
if (empty ($exerciseResult)) {
	$exerciseResult = $_REQUEST['exerciseResult'];
}
if (empty ($exerciseResultCoordinates)) {
	$exerciseResultCoordinates = $_REQUEST['exerciseResultCoordinates'];
}
if (empty ($exerciseType)) {
	$exerciseType = $_REQUEST['exerciseType'];
}
if (empty ($exerciseId)) {
	$exerciseId = Database::escape_string(intval($_REQUEST['exerciseId']));
}
if (empty ($choice)) {
	$choice = $_REQUEST['choice'];
}
if (empty ($_REQUEST['choice'])) {
	$choice = $_REQUEST['choice2'];
}
if (empty ($questionNum)) {
	$questionNum = Database :: escape_string($_REQUEST['questionNum']);
}
if (empty ($nbrQuestions)) {
	$nbrQuestions = Database :: escape_string($_REQUEST['nbrQuestions']);
}
if (empty ($buttonCancel)) {
	$buttonCancel = $_REQUEST['buttonCancel'];
}
$error = '';
if (!isset ($exerciseType)) {
	$exe_start_date = time();
	$_SESSION['exercice_start_date'] = $exe_start_date;
}
// if the user has clicked on the "Cancel" button
if ($buttonCancel) {
	// returns to the exercise list
	header("Location: exercice.php?origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id");
	exit ();
}

if ($origin == 'learnpath' && isset ($_GET['not_multiple_attempt']) && $_GET['not_multiple_attempt'] == strval(intval($_GET['not_multiple_attempt']))) {
	$not_multiple_attempt = (int) $_GET['not_multiple_attempt'];
	if ($not_multiple_attempt === 1) {
		require_once '../inc/reduced_header.inc.php';
		echo '<div style="height:10px">&nbsp;</div>';
		Display :: display_warning_message(get_lang('ReachedOneAttempt'));
		exit;
	}
}

if ($origin == 'builder') {
	/*******************************/
	/* Clears the exercise session */
	/*******************************/
	if (isset ($_SESSION['objExercise'])) {
		api_session_unregister('objExercise');
		unset ($objExercise);
	}
	if (isset ($_SESSION['objQuestion'])) {
		api_session_unregister('objQuestion');
		unset ($objQuestion);
	}
	if (isset ($_SESSION['objAnswer'])) {
		api_session_unregister('objAnswer');
		unset ($objAnswer);
	}
	if (isset ($_SESSION['questionList'])) {
		api_session_unregister('questionList');
		unset ($questionList);
	}
	if (isset ($_SESSION['newquestionList'])) {
		api_session_unregister('newquestionList');
		unset ($newquestionList);
	}
	if (isset ($_SESSION['exerciseResult'])) {
		api_session_unregister('exerciseResult');
		unset ($exerciseResult);
	}
	if (isset ($_SESSION['exerciseResultCoordinates'])) {
		api_session_unregister('exerciseResultCoordinates');
		unset ($exerciseResultCoordinates);
	}
}

$safe_lp_id = ($learnpath_id == '') ? 0 : (int) $learnpath_id;
$safe_lp_item_id = ($learnpath_item_id == '') ? 0 : (int) $learnpath_item_id;
$condition = ' WHERE ' .
	'exe_exo_id = ' . "'" . $exerciseId . "'" . ' AND ' .
	'exe_user_id = ' . "'" . api_get_user_id() . "'" . ' AND ' .
	'exe_cours_id = ' . "'" . $_course['id'] . "'" . ' AND ' .
	'status = ' . "'incomplete'" . ' AND ' .
	'orig_lp_id = ' . "'" . $safe_lp_id . "'" . ' AND ' .
	'orig_lp_item_id = ' . "'" . $safe_lp_item_id . "'" . ' AND ' .
	'session_id = ' . "'" . (int) $_SESSION['id_session'] . "'";

$TBL_EXERCICES = Database :: get_course_table(TABLE_QUIZ_TEST);
$result = api_sql_query("SELECT type,feedback_type FROM $TBL_EXERCICES WHERE id=$exerciseId", __FILE__, __LINE__);
$exercise_row = Database :: fetch_array($result);
$exerciseType = $exercise_row['type'];
$exerciseFeedbackType = $exercise_row['feedback_type'];

if ($_configuration['live_exercise_tracking'] == true && $exerciseType == 2 && $exerciseFeedbackType != 1) {
	$query = 'SELECT * FROM ' . $stat_table . $condition;
	$result_select = api_sql_query($query, __FILE__, __LINE__);
	if (Database :: num_rows($result_select) > 0) {
		$getIncomplete = Database :: fetch_array($result_select);
		$exe_id = $getIncomplete['exe_id'];
		if ($_SERVER['REQUEST_METHOD'] != 'POST') {
			define('QUESTION_LIST_ALREADY_LOGGED', 1);
			$recorded['questionList'] = explode(',', $getIncomplete['data_tracking']);
			$query = 'SELECT * FROM ' . $exercice_attemp_table . ' WHERE exe_id = ' . $getIncomplete['exe_id'] . ' ORDER BY tms ASC';
			$result = api_sql_query($query, __FILE__, __LINE__);
			while ($row = Database :: fetch_array($result)) {
				$recorded['exerciseResult'][$row['question_id']] = 1;
			}
			$exerciseResult = $_SESSION['exerciseResult'] = $recorded['exerciseResult'];
			$exerciseType = 2;
			$questionNum = count($recorded['exerciseResult']);
			$questionNum++;
			$questionList = $_SESSION['questionList'] = $recorded['questionList'];
		}
	} else {
		$table_recorded_not_exist = true;
	}
}

// if the user has submitted the form
if ($formSent) {
	if ($debug > 0) {
		echo str_repeat('&nbsp;', 0) . '$formSent was set' . "<br />\n";
	}

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

	// if the user has answered at least one question
	if (is_array($choice)) {
		if ($debug > 0) {
			echo str_repeat('&nbsp;', 0) . '$choice is an array' . "<br />\n";
		}

		if ($exerciseType == 1)
		{
			// $exerciseResult receives the content of the form.
			// Each choice of the student is stored into the array $choice
			$exerciseResult = $choice;

			// Also store hotspot spots in the session ($exerciseResultCoordinates
			// will be stored in the session at the end of this script)
			// The results will be stored by exercise_result.php if we are in
			// an exercise of type 1 (=all on one page)
			if (isset ($_POST['hotspot'])) {
				$exerciseResultCoordinates = $_POST['hotspot'];
			}
	
		} 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 ($_configuration['live_exercise_tracking'] == true && $exerciseType == 2 && $exerciseFeedbackType != 1) {

					$nro_question = $questionNum; // - 1;

					//START of saving and qualifying each question submitted
					//------------------------------------------------------------------------------------------
					//
					define('ENABLED_LIVE_EXERCISE_TRACKING', 1);
					require_once 'question.class.php';
					require_once 'answer.class.php';					
					$counter = 0;
					$main_course_user_table = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
					$table_ans = Database :: get_course_table(TABLE_QUIZ_ANSWER);
					//foreach($questionList as $questionId)
					if (true) {
						$exeId = $exe_id;
						$questionId = $key;
						$counter++;
						// gets the student choice for this question
						$choice = $exerciseResult[$questionId];

						// creates a temporary Question object				
						$objQuestionTmp = Question :: read($questionId);

						$questionName = $objQuestionTmp->selectTitle();
						$questionDescription = $objQuestionTmp->selectDescription();
						$questionWeighting = $objQuestionTmp->selectWeighting();
						$answerType = $objQuestionTmp->selectType();
						$quesId = $objQuestionTmp->selectId(); //added by priya saini

						// destruction of the Question object
						unset ($objQuestionTmp);

						if (isset ($_POST['hotspot']) && isset($_POST['hotspot'][$key])) {
							$exerciseResultCoordinates[$key] = $_POST['hotspot'][$key];
						}
						
						// construction of the Answer object
						$objAnswerTmp = new Answer($questionId);
						$nbrAnswers = $objAnswerTmp->selectNbrAnswers();
						$questionScore = 0;
						if ($answerType == FREE_ANSWER) {
							$nbrAnswers = 1;
						}

						for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
							$answer = $objAnswerTmp->selectAnswer($answerId);
							$answerComment = $objAnswerTmp->selectComment($answerId);
							$answerCorrect = $objAnswerTmp->isCorrect($answerId);
							$answerWeighting = $objAnswerTmp->selectWeighting($answerId);
							
							switch ($answerType) {
								// for unique answer
								case UNIQUE_ANSWER :
									$studentChoice = ($choice == $answerId) ? 1 : 0;

									if ($studentChoice) {
										$questionScore += $answerWeighting;
										$totalScore += $answerWeighting;
									}

									break;
									// for multiple answers
								case MULTIPLE_ANSWER :

									$studentChoice = $choice[$answerId];

									if ($studentChoice) {
										$questionScore += $answerWeighting;
										$totalScore += $answerWeighting;
									}

									break;
									// for fill in the blanks
								case FILL_IN_BLANKS :

									// the question is encoded like this
									// [A] B [C] D [E] F::10,10,10@1
									// number 1 before the "@" means that is a switchable fill in blank question
									// [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
									// means that is a normal fill blank question

									// first we explode the "::"
									$pre_array = explode('::', $answer);

									// is switchable fill blank or not
									$last = count($pre_array) - 1;
									$is_set_switchable = explode('@', $pre_array[$last]);

									$switchable_answer_set = false;
									if (isset ($is_set_switchable[1]) && $is_set_switchable[1] == 1) {
										$switchable_answer_set = true;
									}

									$answer = '';
									for ($k = 0; $k < $last; $k++) {
										$answer .= $pre_array[$k];
									}

									// splits weightings that are joined with a comma
									$answerWeighting = explode(',', $is_set_switchable[0]);

									// we save the answer because it will be modified
									$temp = $answer;

									// TeX parsing
									// 1. find everything between the [tex] and [/tex] tags
									$startlocations = strpos($temp, '[tex]');
									$endlocations = strpos($temp, '[/tex]');

									if ($startlocations !== false && $endlocations !== false) {
										$texstring = substr($temp, $startlocations, $endlocations - $startlocations +6);
										// 2. replace this by {texcode}
										$temp = str_replace($texstring, '{texcode}', $temp);
									}

									$answer = '';
									$j = 0;

									//initialise answer tags
									$user_tags = array ();
									$correct_tags = array ();
									$real_text = array ();
									// the loop will stop at the end of the text
									while (1) {
										// quits the loop if there are no more blanks (detect '[')
										if (($pos = strpos($temp, '[')) === false) {
											// adds the end of the text
											$answer = $temp;
											// TeX parsing - replacement of texcode tags
											$texstring = api_parse_tex($texstring);
											$answer = str_replace("{texcode}", $texstring, $answer);
											$real_text[] = $answer;
											break; //no more "blanks", quit the loop
										}
										// adds the piece of text that is before the blank
										//and ends with '[' into a general storage array
										$real_text[] = substr($temp, 0, $pos +1);
										$answer .= substr($temp, 0, $pos +1);
										//take the string remaining (after the last "[" we found)
										$temp = substr($temp, $pos +1);
										// quit the loop if there are no more blanks, and update $pos to the position of next ']'
										if (($pos = strpos($temp, ']')) === false) {
											// adds the end of the text
											$answer .= $temp;
											break;
										}
										$choice[$j] = trim($choice[$j]);
										$user_tags[] = strtolower($choice[$j]);
										//put the contents of the [] answer tag into correct_tags[]
										$correct_tags[] = strtolower(substr($temp, 0, $pos));
										$j++;
										$temp = substr($temp, $pos +1);
										//$answer .= ']';
									}

									$answer = '';
									$real_correct_tags = $correct_tags;
									$chosen_list = array ();

									for ($i = 0; $i < count($real_correct_tags); $i++) {
										if ($i == 0) {
											$answer .= $real_text[0];
										}

										if (!$switchable_answer_set) {
											if ($correct_tags[$i] == $user_tags[$i]) {
												// gives the related weighting to the student
												$questionScore += $answerWeighting[$i];
												// increments total score
												$totalScore += $answerWeighting[$i];
												// adds the word in green at the end of the string
												$answer .= $correct_tags[$i];
											}
											// else if the word entered by the student IS NOT the same as the one defined by the professor
											elseif (!empty ($user_tags[$i])) {
												// adds the word in red at the end of the string, and strikes it
												$answer .= '<font color="red"><s>' . $user_tags[$i] . '</s></font>';
											} else {
												// adds a tabulation if no word has been typed by the student
												$answer .= '&nbsp;&nbsp;&nbsp;';
											}
										} else {
											// switchable fill in the blanks
											if (in_array($user_tags[$i], $correct_tags)) {
												$chosen_list[] = $user_tags[$i];
												$correct_tags = array_diff($correct_tags, $chosen_list);

												// gives the related weighting to the student
												$questionScore += $answerWeighting[$i];
												// increments total score
												$totalScore += $answerWeighting[$i];
												// adds the word in green at the end of the string
												$answer .= $user_tags[$i];
											}
											elseif (!empty ($user_tags[$i])) {
												// else if the word entered by the student IS NOT the same as the one defined by the professor
												// adds the word in red at the end of the string, and strikes it
												$answer .= '<font color="red"><s>' . $user_tags[$i] . '</s></font>';
											} else {
												// adds a tabulation if no word has been typed by the student
												$answer .= '&nbsp;&nbsp;&nbsp;';
											}
										}
										// adds the correct word, followed by ] to close the blank
										$answer .= ' / <font color="green"><b>' . $real_correct_tags[$i] . '</b></font>]';
										if (isset ($real_text[$i +1])) {
											$answer .= $real_text[$i +1];
										}
									}

									break;
									// for free answer
								case FREE_ANSWER :
									$studentChoice = $choice;

									if ($studentChoice) {
										//Score is at -1 because the question has'nt been corected
										$questionScore = -1;
										$totalScore += 0;
									}
									break;
									// for matching
								case MATCHING :
									if ($answerCorrect) {
										if ($answerCorrect == $choice[$answerId]) {
											$questionScore += $answerWeighting;
											$totalScore += $answerWeighting;
											$choice[$answerId] = $matching[$choice[$answerId]];
										}
										elseif (!$choice[$answerId]) {
											$choice[$answerId] = '&nbsp;&nbsp;&nbsp;';
										} else {
											$choice[$answerId] = '<font color="red"><s>' . $matching[$choice[$answerId]] . '</s></font>';
										}
									} else {
										$matching[$answerId] = $answer;
									}
									break;
									// for hotspot with no order
								case HOT_SPOT :
									$studentChoice = $choice[$answerId];

									if ($studentChoice) {
										$questionScore += $answerWeighting;
										$totalScore += $answerWeighting;
									}
									break;
									// for hotspot with fixed order
								case HOT_SPOT_ORDER :
									$studentChoice = $choice['order'][$answerId];

									if ($studentChoice == $answerId) {
										$questionScore += $answerWeighting;
										$totalScore += $answerWeighting;
										$studentChoice = true;
									} else {
										$studentChoice = false;
									}
									break;
							} // end switch Answertype
						} // end for that loops over all answers of the current question
						// destruction of Answer
						unset ($objAnswerTmp);

						$i++;

						$totalWeighting += $questionWeighting;
						//added by priya saini
						// Store results directly in the database
						// For all in one page exercises, the results will be
						// stored by exercise_results.php (using the session)
						if ($_configuration['tracking_enabled']) {
							if (empty ($choice)) {
								$choice = 0;
							}
							if ($answerType == MULTIPLE_ANSWER) {
								if ($choice != 0) {
									$reply = array_keys($choice);

									for ($i = 0; $i < sizeof($reply); $i++) {
										$ans = $reply[$i];

										exercise_attempt($questionScore, $ans, $quesId, $exeId, $i);
									}
								} else {
									exercise_attempt($questionScore, 0, $quesId, $exeId, 0);
								}
							}
							elseif ($answerType == MATCHING) {
								$j = sizeof($matching) + 1;

								for ($i = 0; $i < sizeof($choice); $i++, $j++) {
									$val = $choice[$j];
									if (preg_match_all('#<font color="red"><s>([0-9a-z ]*)</s></font>#', $val, $arr1)) {
										$val = $arr1[1][0];
									}
									$val = $val;
									$val = strip_tags($val);
									$sql = "select position from $table_ans where question_id='" . Database :: escape_string($questionId) . "' and answer='" . Database :: escape_string($val) . "' AND correct=0";
									$res = api_sql_query($sql, __FILE__, __LINE__);
									if (Database :: num_rows($res) > 0) {
										$answer = Database :: result($res, 0, "position");
									} else {
										$answer = '';
									}
									exercise_attempt($questionScore, $answer, $quesId, $exeId, $j);

								}
							} elseif ($answerType == FREE_ANSWER) {
								$answer = $choice;
								exercise_attempt($questionScore, $answer, $quesId, $exeId, 0);
							} elseif ($answerType == UNIQUE_ANSWER) {
								$sql = "select id from $table_ans where question_id='" . Database :: escape_string($questionId) . "' and position='" . Database :: escape_string($choice) . "'";
								$res = api_sql_query($sql, __FILE__, __LINE__);
								$answer = Database :: result($res, 0, "id");
								exercise_attempt($questionScore, $answer, $quesId, $exeId, 0);
							} elseif ($answerType == HOT_SPOT) {
								exercise_attempt($questionScore, $answer, $quesId, $exeId, 0);
								if (is_array($exerciseResultCoordinates[$key])) {
									foreach($exerciseResultCoordinates[$key] as $idx => $val) {
										exercise_attempt_hotspot($exeId,$quesId,$idx,$choice[$idx],$val);
									}
								}
							} else {
								exercise_attempt($questionScore, $answer, $quesId, $exeId, 0);
							}
						}
					}
					// end huge foreach() block that loops over all questions

					//at loops over all questions
					if (isset($exe_id)) {
						$sql_update = 'UPDATE ' . $stat_table . ' SET exe_result = exe_result + ' . (int) $totalScore . ',exe_weighting = exe_weighting + ' . (int) $totalWeighting . ' WHERE exe_id = ' . Database::escape_string($exe_id);
						api_sql_query($sql_update, __FILE__, __LINE__);
					}
					//END of saving and qualifying
					//------------------------------------------------------------------------------------------
					//
				}
			}
		}
		if ($debug > 0) {
			echo str_repeat('&nbsp;', 0) . '$choice is an array - end' . "<br />\n";
		}
	}

	// the script "exercise_result.php" will take the variable $exerciseResult from the session
	api_session_register('exerciseResult');
	api_session_register('exerciseResultCoordinates');
	define('ALL_ON_ONE_PAGE',1);
	define('ONE_PER_PAGE',2);
	// if all questions on one page OR if it is the last question (only for an exercise with one question per page)
	if ($exerciseType == ALL_ON_ONE_PAGE || $questionNum >= $nbrQuestions) {
		if ($debug > 0) {
			echo str_repeat('&nbsp;', 0) . 'Redirecting to exercise_result.php - Remove debug option to let this happen' . "<br />\n";
		}
		// goes to the script that will show the result of the exercise
		if ($exerciseType == ALL_ON_ONE_PAGE) {
			header("Location: exercise_result.php?id=$exe_id&exerciseType=$exerciseType&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id");
		} else {
			if ($exe_id != '') {
				//clean incomplete
				$update_query = 'UPDATE ' . $stat_table . ' SET ' . "status = '', data_tracking='', exe_date = '" . date('Y-m-d H:i:s') . "'" . ' WHERE exe_id = ' . Database::escape_string($exe_id);
				api_sql_query($update_query, __FILE__, __LINE__);
			}
			header("Location: exercise_show.php?id=$exe_id&exerciseType=$exerciseType&origin=$origin&learnpath_id=$learnpath_id&learnpath_item_id=$learnpath_item_id");
		}
		exit ();
	}
	if ($debug > 0) {
		echo str_repeat('&nbsp;', 0) . '$formSent was set - end' . "<br />\n";
	}
}

// if the object is not in the session

//why destroying the exercise when a LP is loaded ?
//if (!isset($_SESSION['objExercise']) || $origin == 'learnpath' || $_SESSION['objExercise']->id != $_REQUEST['exerciseId']) {
if (!isset ($_SESSION['objExercise']) || $_SESSION['objExercise']->id != $_REQUEST['exerciseId']) {
	if ($debug > 0) {
		echo str_repeat('&nbsp;', 0) . '$_SESSION[objExercise] was unset' . "<br />\n";
	}
	// construction of Exercise
	$objExercise = new Exercise();
	unset ($_SESSION['questionList']);

	// if the specified exercise doesn't exist or is disabled
	if (!$objExercise->read($exerciseId) || (!$objExercise->selectStatus() && !$is_allowedToEdit && ($origin != 'learnpath'))) {
		unset ($objExercise);
		$error = get_lang('ExerciseNotFound');
		//die(get_lang('ExerciseNotFound'));
	} else {
		// saves the object into the session
		api_session_register('objExercise');
		if ($debug > 0) {
			echo str_repeat('&nbsp;', 0) . '$_SESSION[objExercise] was unset - set now - end' . "<br />\n";
		}
	}
}

if (!isset ($objExcercise) && isset ($_SESSION['objExercise'])) {
	$objExercise = $_SESSION['objExercise'];
}
if (!is_object($objExercise)) {
	header('Location: exercice.php');
	exit ();
}
$Exe_starttime = $objExercise->start_time;
$Exe_endtime = $objExercise->end_time;
$quizID = $objExercise->selectId();
$exerciseAttempts = $objExercise->selectAttempts();
$exerciseTitle = $objExercise->selectTitle();
$exerciseDescription = $objExercise->selectDescription();
$exerciseDescription = $exerciseDescription;
$exerciseSound = $objExercise->selectSound();
$randomQuestions = $objExercise->isRandom();
$exerciseType = $objExercise->selectType();
$table_quiz_test = Database :: get_course_table(TABLE_QUIZ_TEST);
//if (!isset($_SESSION['questionList']) || $origin == 'learnpath') {
//in LP's is enabled the "remember question" feature?
$my_exe_id = Security :: remove_XSS($_GET['exerciseId']);
if (!isset ($_SESSION['questionList'])) {
	if ($debug > 0) {
		echo str_repeat('&nbsp;', 0) . '$_SESSION[questionList] was unset' . "<br />\n";
	}
	// selects the list of question ID
	$my_question_list = array ();
	$questionList = ($randomQuestions ? $objExercise->selectRandomList() : $objExercise->selectQuestionList());
	// saves the question list into the session
	$sql = 'SELECT random FROM ' . $table_quiz_test . ' WHERE id="' . Database :: escape_string($my_exe_id) . '";';
	$rs = api_sql_query($sql, __FILE__, __LINE__);
	$row_number = Database :: fetch_array($rs);
	$z = 0;

	if ($row_number['random'] <> 0) {
		foreach ($questionList as $infoquestionList) {
			if ($z < $row_number['random']) {
				$my_question_list[$z] = $infoquestionList;
			} else {
				break;
			}
			$z++;
		}
		// $questionList=array();
		$questionList = $my_question_list;
	}
	api_session_register('questionList');
	if ($debug > 0) {
		echo str_repeat('&nbsp;', 0) . '$_SESSION[questionList] was unset - set now - end' . "<br />\n";
	}
}
if (!isset ($objExcercise) && isset ($_SESSION['objExercise'])) {
	$questionList = $_SESSION['questionList'];
}

$quizStartTime = time();
api_session_register('quizStartTime');
$nbrQuestions = sizeof($questionList);
// if questionNum comes from POST and not from GET
if (!$questionNum || $_POST['questionNum']) {
	// only used for sequential exercises (see $exerciseType)
	if (!$questionNum) {
		$questionNum = 1;
	} else {
		$questionNum++;
	}
}

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/' . $_SESSION['gradebook_dest'],
		'name' => get_lang('Gradebook')
	);
}
//$nameTools=get_lang('Exercice');

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

if ($origin != 'learnpath') { //so we are not in learnpath tool

	$htmlHeadXtra[] = "<script type=\"text/javascript\" src=\"../plugin/hotspot/JavaScriptFlashGateway.js\"></script>
						<script src=\"../plugin/hotspot/hotspot.js\" type=\"text/javascript\"></script>
						<script language=\"JavaScript\" type=\"text/javascript\">
						<!--
						// -----------------------------------------------------------------------------
						// Globals
						// Major version of Flash required
						var requiredMajorVersion = 7;
						// Minor version of Flash required
						var requiredMinorVersion = 0;
						// Minor version of Flash required
						var requiredRevision = 0;
						// the version of javascript supported
						var jsVersion = 1.0;
						// -----------------------------------------------------------------------------
						// -->
						</script>
						<script language=\"VBScript\" type=\"text/vbscript\">
						<!-- // Visual basic helper required to detect Flash Player ActiveX control version information
						Function VBGetSwfVer(i)
						  on error resume next
						  Dim swControl, swVersion
						  swVersion = 0
	
						  set swControl = CreateObject(\"ShockwaveFlash.ShockwaveFlash.\" + CStr(i))
						  if (IsObject(swControl)) then
						    swVersion = swControl.GetVariable(\"\$version\")
						  end if
						  VBGetSwfVer = swVersion
						End Function
						// -->
						</script>
	
						<script language=\"JavaScript1.1\" type=\"text/javascript\">
						<!-- // Detect Client Browser type
						var isIE  = (navigator.appVersion.indexOf(\"MSIE\") != -1) ? true : false;
						var isWin = (navigator.appVersion.toLowerCase().indexOf(\"win\") != -1) ? true : false;
						var isOpera = (navigator.userAgent.indexOf(\"Opera\") != -1) ? true : false;
						jsVersion = 1.1;
						// JavaScript helper required to detect Flash Player PlugIn version information
						function JSGetSwfVer(i){
							// NS/Opera version >= 3 check for Flash plugin in plugin array
							if (navigator.plugins != null && navigator.plugins.length > 0) {
								if (navigator.plugins[\"Shockwave Flash 2.0\"] || navigator.plugins[\"Shockwave Flash\"]) {
									var swVer2 = navigator.plugins[\"Shockwave Flash 2.0\"] ? \" 2.0\" : \"\";
						      		var flashDescription = navigator.plugins[\"Shockwave Flash\" + swVer2].description;
									descArray = flashDescription.split(\" \");
									tempArrayMajor = descArray[2].split(\".\");
									versionMajor = tempArrayMajor[0];
									versionMinor = tempArrayMajor[1];
									if ( descArray[3] != \"\" ) {
										tempArrayMinor = descArray[3].split(\"r\");
									} else {
										tempArrayMinor = descArray[4].split(\"r\");
									}
						      		versionRevision = tempArrayMinor[1] > 0 ? tempArrayMinor[1] : 0;
						            flashVer = versionMajor + \".\" + versionMinor + \".\" + versionRevision;
						      	} else {
									flashVer = -1;
								}
							}
							// MSN/WebTV 2.6 supports Flash 4
							else if (navigator.userAgent.toLowerCase().indexOf(\"webtv/2.6\") != -1) flashVer = 4;
							// WebTV 2.5 supports Flash 3
							else if (navigator.userAgent.toLowerCase().indexOf(\"webtv/2.5\") != -1) flashVer = 3;
							// older WebTV supports Flash 2
							else if (navigator.userAgent.toLowerCase().indexOf(\"webtv\") != -1) flashVer = 2;
							// Can't detect in all other cases
							else {
	
								flashVer = -1;
							}
							return flashVer;
						}
						// When called with reqMajorVer, reqMinorVer, reqRevision returns true if that version or greater is available
						function DetectFlashVer(reqMajorVer, reqMinorVer, reqRevision)
						{
						 	reqVer = parseFloat(reqMajorVer + \".\" + reqRevision);
						   	// loop backwards through the versions until we find the newest version
							for (i=25;i>0;i--) {
								if (isIE && isWin && !isOpera) {
									versionStr = VBGetSwfVer(i);
								} else {
									versionStr = JSGetSwfVer(i);
								}
								if (versionStr == -1 ) {
									return false;
								} else if (versionStr != 0) {
									if(isIE && isWin && !isOpera) {
										tempArray         = versionStr.split(\" \");
										tempString        = tempArray[1];
										versionArray      = tempString .split(\",\");
									} else {
										versionArray      = versionStr.split(\".\");
									}
									versionMajor      = versionArray[0];
									versionMinor      = versionArray[1];
									versionRevision   = versionArray[2];
	
									versionString     = versionMajor + \".\" + versionRevision;   // 7.0r24 == 7.24
									versionNum        = parseFloat(versionString);
						        	// is the major.revision >= requested major.revision AND the minor version >= requested minor
									if ( (versionMajor > reqMajorVer) && (versionNum >= reqVer) ) {
										return true;
									} else {
										return ((versionNum >= reqVer && versionMinor >= reqMinorVer) ? true : false );
									}
								}
							}
						}
						// -->
						</script>";
	Display :: display_header($nameTools, "Exercise");
} else {
	if (empty ($charset)) {
		$charset = 'ISO-8859-15';
	}
	/*
	 * HTML HEADER
	 */
	Display::display_reduced_header();
	echo '<div style="height:10px">&nbsp;</div>';
}

// I'm in a preview mode
if (api_is_course_admin() && $origin != 'learnpath') {
	echo '<div class="actions">';
	echo Display :: return_icon('quiz.gif', get_lang('GoBackToEx')) . '<a href="admin.php?' . api_get_cidreq() . '&exerciseId=' . $objExercise->id . '">' . get_lang('GoBackToEx') . '</a>';
	echo Display :: return_icon('edit.gif', get_lang('ModifyExercise')) . '<a href="exercise_admin.php?modifyExercise=yes&exerciseId=' . $objExercise->id . '">' . get_lang('ModifyExercise') . '</a>';
	echo '</div>';
}

$exerciseTitle = api_parse_tex($exerciseTitle);

echo "<h3>" . $exerciseTitle . "</h3>";

if ($exerciseAttempts > 0) {
	$user_id = api_get_user_id();
	$course_code = api_get_course_id();
	$sql = "SELECT count(*) FROM $stat_table WHERE exe_exo_id = '$quizID'
				AND exe_user_id = '$user_id'
				AND status != 'incomplete'
				AND orig_lp_id = $safe_lp_id 
				AND orig_lp_item_id = $safe_lp_item_id  
	            AND exe_cours_id = '$course_code' AND session_id = '" . (int) $_SESSION['id_session'] . "'";

	$aquery = api_sql_query($sql, __FILE__, __LINE__);
	$attempt = Database :: fetch_array($aquery);

	if ($attempt[0] >= $exerciseAttempts) {
		if (!api_is_allowed_to_edit()) {
			Display :: display_warning_message(sprintf(get_lang('ReachedMaxAttempts'), $exerciseTitle, $exerciseAttempts), false);
			if ($origin != 'learnpath')
				Display :: display_footer();
			exit;
		} else {
			Display :: display_warning_message(sprintf(get_lang('ReachedMaxAttemptsAdmin'), $exerciseTitle, $exerciseAttempts), false);
		}
	}
}

if (!function_exists('convert_date_to_number')) {
	function convert_date_to_number($default) {
		// 2008-10-12 00:00:00 ---to--> 12345672218 (timestamp)
		$parts = split(' ', $default);
		list ($d_year, $d_month, $d_day) = split('-', $parts[0]);
		list ($d_hour, $d_minute, $d_second) = split(':', $parts[1]);
		return mktime($d_hour, $d_minute, $d_second, $d_month, $d_day, $d_year);
	}
}

$limit_time_exists = (($Exe_starttime != '0000-00-00 00:00:00') || ($Exe_endtime != '0000-00-00 00:00:00')) ? true : false;
if ($limit_time_exists) {
	$exercise_start_time = convert_date_to_number($Exe_starttime);
	$exercise_end_time = convert_date_to_number($Exe_endtime);
	$time_now = convert_date_to_number(date('Y-m-d H:i:s'));
	$permission_to_start = (($time_now - $exercise_start_time) > 0) ? true : false;
	if ($_SERVER['REQUEST_METHOD'] != 'POST')
		$exercise_timeover = (($time_now - $exercise_end_time) > 0) ? true : false;
	if ($permission_to_start == false || $exercise_timeover == true) { //
		if (!api_is_allowed_to_edit()) {
			$message_warning = ($permission_to_start == false) ? get_lang('ExerciseNoStartedYet') : get_lang('ReachedTimeLimit');
			Display :: display_warning_message(sprintf($message_warning, $exerciseTitle, $exerciseAttempts));
			Display :: display_footer();
			exit;
		} else {
			$message_warning = ($permission_to_start == false) ? get_lang('ExerciseNoStartedAdmin') : get_lang('ReachedTimeLimitAdmin');
			Display :: display_warning_message(sprintf($message_warning, $exerciseTitle, $exerciseAttempts));
		}
	}
}

if (!empty ($error)) {
	Display :: display_error_message($error, false);
} else {
	if (!empty ($exerciseSound)) {
		echo "<a href=\"../document/download.php?doc_url=%2Faudio%2F" . Security::remove_XSS($exerciseSound) . "\" 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 ($exerciseType == 2) {
				// if it is not the right question, goes to the next loop iteration
				if ($questionNum != $i) {
					continue;
				} else {
					if ($objQuestionTmp->selectType() == HOT_SPOT) {
						$number_of_hotspot_questions++;
					}

					break;
				}
			} else {
				if ($objQuestionTmp->selectType() == HOT_SPOT) {
					$number_of_hotspot_questions++;
				}
			}
		}
	}
	if ($number_of_hotspot_questions > 0) {
		$onsubmit = "onsubmit=\"return validateFlashVar('" . $number_of_hotspot_questions . "', '" . get_lang('HotspotValidateError1') . "', '" . get_lang('HotspotValidateError2') . "');\"";
	}
	$s = "<p>$exerciseDescription</p>";

	if ($exerciseType == 2) 
	{
		$s2 = "&exerciseId=" . $exerciseId;
	}

	$s .= " <form method='post' action='" . api_get_self() . "?autocomplete=off&gradebook=$gradebook" . $s2 . "' name='frm_exercise' $onsubmit>
		 <input type='hidden' name='formSent' value='1' />
		 <input type='hidden' name='exerciseType' value='" . $exerciseType . "' />
		 <input type='hidden' name='exerciseId' value='" . $exerciseId . "' />
		 <input type='hidden' name='questionNum' value='" . $questionNum . "' />
		 <input type='hidden' name='nbrQuestions' value='" . $nbrQuestions . "' />
		 <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 . "' />
		 <table width='100%' border='0' cellpadding='1' cellspacing='0'>
			<tr>
		 		<td>
		  			<table width='100%' cellpadding='3' cellspacing='0' border='0'>";
	echo $s;
	$i = 1;
	foreach ($questionList as $questionId) {
		// for sequential exercises
		if ($exerciseType == 2) {
			// if it is not the right question, goes to the next loop iteration			
			if ($questionNum != $i) {
				$i++;
				continue;
			} else {
				if ($exerciseFeedbackType != 1) {
					// 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'));
						$i++;
						//echo '<tr><td>'.get_lang('AlreadyAnswered').' &quot;'.$questionName.'&quot;</td></tr>';	
						break;
					}
				}
			}
		}
		// shows the question and its answers		
		showQuestion($questionId, false, $origin, $i, $nbrQuestions);
		$i++;
		// for sequential exercises
		if ($exerciseType == 2) {
			// quits the loop
			break;
		}
	}
	// end foreach()
	echo "<!-- <button type='submit' name='buttonCancel' class='cancel'>" . get_lang('Cancel') . "</button>
		   &nbsp;&nbsp; //--><br />";
	echo '<div style="padding-left:10px; margin-top:-10px;">';
	$submit_btn = "<button class='next' type='submit' name='submit'>";
	//	$submit_btn.=get_lang('ValidateAnswer'); 
	if ($objExercise->selectFeedbackType() == 1 && $_SESSION['objExercise']->selectType() == 2) {
		$submit_btn = '';
		echo '<script src="' . api_get_path(WEB_LIBRARY_PATH) . 'javascript/thickbox.js" type="text/javascript"></script>';
		echo '<style type="text/css" media="all">@import "' . api_get_path(WEB_LIBRARY_PATH) . 'javascript/thickbox.css";</style>';
		$hotspot_get = $_POST['hotspot'];
		// Show a hidden div			
		echo "<script>$(document).ready( function(){
							  $('.rounded').corners();
							  $('.rounded_inner').corners();
							});</script>";
		//echo '<br /><span class="rounded" style="width: 300px; margin-top: 10px; padding: 3px; background-color:#ccc;"><span style="width: 300px" class="rounded_inner" ><a href="exercise_submit_modal.php?hotspot='.$hotspot_get.'&nbrQuestions='.$nbrQuestions.'&questionnum='.$questionNum.'&exerciseType='.$exerciseType.'&exerciseId='.$exerciseId.'&placeValuesBeforeTB_=savedValues&TB_iframe=true&height=480&width=640&modal=true" title="" class="thickbox" id="validationButton">'.get_lang('ValidateAnswer').'</a></span></span><br /><br /><br />';

	} else {
		if ($exerciseType == 1 || $nbrQuestions == $questionNum) {
			$submit_btn .= get_lang('ValidateAnswer');
		} else {
			$submit_btn .= get_lang('NextQuestion');
		}
		$submit_btn .= "</button>";
	}

	echo $submit_btn;
	echo "</table>
			</td>
			</tr>
			</table></form>";
	$b = 2;
}
echo '</div>';
if ($_configuration['live_exercise_tracking'] == true && $exerciseFeedbackType != 1) {
	//if($questionNum < 2){
	if ($table_recorded_not_exist) {
		if ($exerciseType == 2) {
			api_sql_query("INSERT INTO $stat_table(exe_exo_id,exe_user_id,exe_cours_id,status,session_id,data_tracking,start_date,orig_lp_id,orig_lp_item_id)
										VALUES('$exerciseId','" . api_get_user_id() . "','" . $_course['id'] . "','incomplete','" . api_get_session_id() . "','" . implode(',', $questionList) . "','" . date('Y-m-d H:i:s') . "',$safe_lp_id,$safe_lp_item_id)", __FILE__, __LINE__);
		} else {
			api_sql_query("INSERT INTO $stat_table (exe_exo_id,exe_user_id,exe_cours_id,status,session_id,start_date,orig_lp_id,orig_lp_item_id)
									   VALUES('$exerciseId','" . api_get_user_id() . "','" . $_course['id'] . "','incomplete','" . api_get_session_id() . "','" . date('Y-m-d H:i:s') . "',$safe_lp_id,$safe_lp_item_id)", __FILE__, __LINE__);
		}
	}
}

if ($origin != 'learnpath') {
	//so we are not in learnpath tool
	Display :: display_footer();
}