<?php
/*
    DOKEOS - elearning and course management software

    For a full list of contributors, see documentation/credits.html

    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 "documentation/licence.html" more details.

    Contact:
		Dokeos
		Rue des Palais 44 Paleizenstraat
		B-1030 Brussels - Belgium
		Tel. +32 (2) 211 34 56
*/


/**
*	Question Pool
* 	This script allows administrators to manage questions and add them into their exercises.
* 	One question can be in several exercises
*	@package dokeos.exercise
* 	@author Olivier Brouckaert
* 	@version $Id: question_pool.php 11110 2007-02-14 13:48:08Z elixir_julian $
*/

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

include('exercise.class.php');
include('question.class.php');
include('answer.class.php');

include('../inc/global.inc.php');



$this_section=SECTION_COURSES;

$is_allowedToEdit=$is_courseAdmin;

$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);

if ( empty ( $delete ) ) {
    $delete = $_GET['delete'];
}
if ( empty ( $recup ) ) {
    $recup = $_GET['recup'];
}
if ( empty ( $fromExercise ) ) {
    $fromExercise = $_GET['fromExercise'];
}

// maximum number of questions on a same page
$limitQuestPage=50;

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

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

if($is_allowedToEdit)
{
	// deletes a question from the data base and all exercises
	if($delete)
	{
		// construction of the Question object
		// if the question exists
		if($objQuestionTmp = Question::read($delete))
		{
			// deletes the question from all exercises
			$objQuestionTmp->delete();
		}

		// destruction of the Question object
		unset($objQuestionTmp);
	}
	// gets an existing question and copies it into a new exercise
	elseif($recup && $fromExercise)
	{
		// if the question exists
		if($objQuestionTmp = Question :: read($recup))
		{
			// adds the exercise ID represented by $fromExercise into the list of exercises for the current question
			$objQuestionTmp->addToList($fromExercise);
		}

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

		// adds the question ID represented by $recup into the list of questions for the current exercise
		$objExercise->addToList($recup);

		api_session_register('objExercise');

		header("Location: admin.php");
		exit();
	}
}

$nameTools=get_lang('QuestionPool');

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

Display::display_header($nameTools,"Exercise");
// if admin of course
if($is_allowedToEdit)
{
?>

<h3>
  <?php echo $nameTools; ?>
</h3>

<form method="get" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="hidden" name="fromExercise" value="<?php echo $fromExercise; ?>">
<table class="data_table">
<tr>
  <td colspan="<?php echo $fromExercise?2:3; ?>" align="right">
	<?php echo get_lang('Filter'); ?> : <select name="exerciseId">
	<option value="0">-- <?php echo get_lang('AllExercises'); ?> --</option>
	<option value="-1" <?php if($exerciseId == -1) echo 'selected="selected"'; ?>>-- <?php echo get_lang('OrphanQuestions'); ?> --</option>

<?php 
	$sql="SELECT id,title FROM $TBL_EXERCICES WHERE id<>'$fromExercise' ORDER BY id";
	$result=api_sql_query($sql,__FILE__,__LINE__);

	// shows a list-box allowing to filter questions
	while($row=mysql_fetch_array($result))
	{
?>

	<option value="<?php echo $row['id']; ?>" <?php if($exerciseId == $row['id']) echo 'selected="selected"'; ?>><?php echo $row['title']; ?></option>

<?php
	}
?>

    </select> <input type="submit" value="<?php echo get_lang('Ok'); ?>">
  </td>
</tr>

<?php
	$from=$page*$limitQuestPage;

	// if we have selected an exercise in the list-box 'Filter'
	if($exerciseId > 0)
	{
		$sql="SELECT id,question,type FROM $TBL_EXERCICE_QUESTION,$TBL_QUESTIONS WHERE question_id=id AND exercice_id='$exerciseId' ORDER BY position LIMIT $from,".($limitQuestPage+1);
		$result=api_sql_query($sql,__FILE__,__LINE__);
	}
	// if we have selected the option 'Orphan questions' in the list-box 'Filter'
	elseif($exerciseId == -1)
	{
		$sql="SELECT id,question,type FROM $TBL_QUESTIONS LEFT JOIN $TBL_EXERCICE_QUESTION ON question_id=id WHERE exercice_id IS NULL ORDER BY question LIMIT $from,".($limitQuestPage+1);
		$result=api_sql_query($sql,__FILE__,__LINE__);
	}
	// if we have not selected any option in the list-box 'Filter'
	else
	{
		$sql="SELECT id,question,type FROM $TBL_QUESTIONS LEFT JOIN $TBL_EXERCICE_QUESTION ON question_id=id WHERE exercice_id IS NULL OR exercice_id<>'$fromExercise' GROUP BY id ORDER BY question LIMIT $from,".($limitQuestPage+1);
		$result=api_sql_query($sql,__FILE__,__LINE__);

		// forces the value to 0
		$exerciseId=0;
	}

	$nbrQuestions=mysql_num_rows($result);
?>

<tr>
  <td colspan="<?php echo $fromExercise?2:3; ?>">
	<table border="0" cellpadding="0" cellspacing="0" width="100%">
	<tr>
	  <td>

<?php
	if($fromExercise)
	{
?>

		<a href="admin.php">&lt;&lt; <?php echo get_lang('GoBackToEx'); ?></a>

<?php
	}
	else
	{
?>

		<a href="admin.php?newQuestion=yes"><?php echo get_lang('NewQu'); ?></a>

<?php
	}
?>

	  </td>
	  <td align="right">

<?php
	if($page)
	{
?>

	<a href="<?php echo $_SERVER['PHP_SELF']; ?>?exerciseId=<?php echo $exerciseId; ?>&fromExercise=<?php echo $fromExercise; ?>&page=<?php echo ($page-1); ?>">&lt;&lt; <?php echo get_lang('PreviousPage'); ?></a> |

<?php
	}
	elseif($nbrQuestions > $limitQuestPage)
	{
?>

	&lt;&lt; <?php echo get_lang('PreviousPage'); ?> |

<?php
	}

	if($nbrQuestions > $limitQuestPage)
	{
?>

	<a href="<?php echo $_SERVER['PHP_SELF']; ?>?exerciseId=<?php echo $exerciseId; ?>&fromExercise=<?php echo $fromExercise; ?>&page=<?php echo ($page+1); ?>"><?php echo get_lang('NextPage'); ?> &gt;&gt;</a>

<?php
	}
	elseif($page)
	{
?>

	<?php echo get_lang('NextPage'); ?> &gt;&gt;

<?php
	}
?>

	  </td>
	</tr>
	</table>
  </td>
</tr>
<tr bgcolor="#E6E6E6">

<?php
	if($fromExercise)
	{
?>

  <th><?php echo get_lang('Question'); ?></th>
  <th><?php echo get_lang('Reuse'); ?></th>

<?php
	}
	else
	{
?>

  <td width="60%" align="center"><?php echo get_lang('Question'); ?></td>
  <td width="20%" align="center"><?php echo get_lang('Modify'); ?></td>
  <td width="20%" align="center"><?php echo get_lang('Delete'); ?></td>

<?php
	}
?>

</tr>

<?php
	$i=1;

	while($row=mysql_fetch_array($result))
	{
		// if we come from the exercise administration to get a question, doesn't show the question already used by that exercise
		if(!$fromExercise || !$objExercise->isInList($row[id]))
		{
?>

<tr <?php if($i%2==0) echo 'class="row_odd"'; else echo 'class="row_even"'; ?>>
  <td><a href="admin.php?editQuestion=<?php echo $row[id]; ?>&fromExercise=<?php echo $fromExercise; ?>"><?php echo $row[question]; ?></a></td>
  <td>

<?php
			if(!$fromExercise)
			{
?>

	<a href="admin.php?editQuestion=<?php echo $row[id]; ?>"><img src="../img/edit.gif" border="0" alt="<?php echo get_lang('Modify'); ?>"></a>

<?php
			}
			else
			{
?>

	<a href="<?php echo $phpSelf; ?>?recup=<?php echo $row[id]; ?>&fromExercise=<?php echo $fromExercise; ?>"><img src="../img/view_more_stats.gif" border="0" alt="<?php echo get_lang('Reuse'); ?>"></a>

<?php
			}
?>

  </td>

<?php
			if(!$fromExercise)
			{
?>

  <td align="center">
    <a href="<?php echo $_SERVER['PHP_SELF']; ?>?exerciseId=<?php echo $exerciseId; ?>&delete=<?php echo $row[id]; ?>" onclick="javascript:if(!confirm('<?php echo addslashes(htmlentities(get_lang('ConfirmYourChoice'), ENT_NOQUOTES, 'gb2312')); ?>')) return false;"><img src="../img/delete.gif" border="0" alt="<?php echo get_lang('Delete'); ?>"></a>
  </td>

<?php
			}
?>

</tr>

<?php
			// skips the last question, that is only used to know if we have or not to create a link "Next page"
			if($i == $limitQuestPage)
			{
				break;
			}

			$i++;
		}
	}

	if(!$nbrQuestions)
	{
?>

<tr>
  <td colspan="<?php echo $fromExercise?2:3; ?>"><?php echo get_lang('NoQuestion'); ?></td>
</tr>

<?php
	}
?>

</table>
</form>

<?php
}
// if not admin of course
else
{
	api_not_allowed();
}

Display::display_footer();
?>
