<?php
//  $Id: class.php 9119 2006-08-18 07:10:23Z bmol $
/*
==============================================================================
	Dokeos - elearning and course management software

	Copyright (c) 2004-2005 Dokeos S.A.
	Copyright (c) Bart Mollet, Hogeschool Gent

	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, 44 rue des palais, B-1030 Brussels, Belgium
	Mail: info@dokeos.com
==============================================================================
*/
/**
==============================================================================
*	This							 script allows teachers to manage subscribed
*classes in their course.
*	@package dokeos.user
==============================================================================
*/
/*
==============================================================================
		INIT SECTION
==============================================================================
*/
// name of the language file that needs to be included 
$language_file = array('registration','admin');
include ('../inc/global.inc.php');
$this_section = SECTION_COURSES;

require_once (api_get_path(LIBRARY_PATH).'course.lib.php');
require_once (api_get_path(LIBRARY_PATH).'sortabletable.class.php');
require_once (api_get_path(LIBRARY_PATH).'classmanager.lib.php');
require_once (api_get_path(LIBRARY_PATH).'formvalidator/FormValidator.class.php');

/*
==============================================================================
		MAIN CODE
==============================================================================
*/

api_protect_course_script();

if(api_get_setting('use_session_mode')=='true')
{
	api_not_allowed();
}

/*
-----------------------------------------------------------
	Header
-----------------------------------------------------------
*/
$tool_name = get_lang("Classes");
//extra entries in breadcrumb
$interbreadcrumb[] = array ("url" => "user.php", "name" => get_lang("Users"));
Display :: display_header($tool_name, "User");

api_display_tool_title($tool_name);
if (api_is_allowed_to_edit())
{
	echo '<a href="subscribe_class.php">'.get_lang("AddClassesToACourse").'</a><br /><br />';
}
/*
==============================================================================
		MAIN SECTION
==============================================================================
*/

if(api_is_allowed_to_edit())
{
	if (isset ($_GET['unsubscribe']))
	{
		ClassManager::unsubscribe_from_course($_GET['class_id'],$_course['sysCode']);
		Display::display_normal_message(get_lang('ClassesUnSubscribed'));
	}
	if (isset ($_POST['action']))
	{
		switch ($_POST['action'])
		{
			case 'unsubscribe' :
				if (is_array($_POST['class']))
				{
					foreach ($_POST['class'] as $index => $class_id)
					{
						ClassManager::unsubscribe_from_course($class_id,$_course['sysCode']);
					}
					Display::display_normal_message(get_lang('ClassesUnSubscribed'));
				}
				break;
		}
	}
}
/*
-----------------------------------------------------------
		SHOW LIST OF CLASSES
-----------------------------------------------------------
*/

/**
 *  * Get the number of classes to display on the current page.
 */
function get_number_of_classes()
{
	$class_table = Database :: get_main_table(TABLE_MAIN_CLASS);
	$course_class_table = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
	$sql = "SELECT c.id	FROM $class_table c, $course_class_table cc WHERE cc.class_id = c.id AND cc.course_code ='".$_SESSION['_course']['id']."'";
	if (isset ($_GET['keyword']))
	{
		$keyword = mysql_real_escape_string($_GET['keyword']);
		$sql .= " AND (c.name LIKE '%".$keyword."%')";
	}
	$res = api_sql_query($sql, __FILE__, __LINE__);
	$result = mysql_num_rows($res);
	return $result;
}
/**
 * Get the classes to display on the current page.
 */
function get_class_data($from, $number_of_items, $column, $direction)
{
	$class_table = Database :: get_main_table(TABLE_MAIN_CLASS);
	$course_class_table = Database :: get_main_table(TABLE_MAIN_COURSE_CLASS);
	$class_user_table = Database :: get_main_table(TABLE_MAIN_CLASS_USER);
	$sql = "SELECT
							c.id AS col0,
							c.name   AS col1,
							COUNT(cu.user_id) AS col2";
	if (api_is_allowed_to_edit())
	{
		$sql .=	" ,c.id AS col3";
	}
	// '(' and ')' in next query is necessary (see http://bugs.mysql.com/bug.php?id=19053)
	$sql .= " FROM ($class_table c, $course_class_table cc)";
	$sql .= " LEFT JOIN $class_user_table cu ON cu.class_id = c.id";
	$sql .= " WHERE c.id = cc.class_id AND cc.course_code = '".$_SESSION['_course']['id']."'";
	if (isset ($_GET['keyword']))
	{
		$keyword = mysql_real_escape_string($_GET['keyword']);
		$sql .= " AND (c.name LIKE '%".$keyword."%')";
	}
	$sql .= " GROUP BY c.id, c.name ";
	$sql .= " ORDER BY col$column $direction ";
	$sql .= " LIMIT $from,$number_of_items";
	$res = api_sql_query($sql, __FILE__, __LINE__);
	$classes = array ();
	while ($class = mysql_fetch_row($res))
	{
		$classes[] = $class;
	}
	return $classes;
}
/**
 * Build the reg-column of the table
 * @param int $class_id The class id
 * @return string Some HTML-code
 */
function reg_filter($class_id)
{
	$result = '<a href="'.$_SERVER['PHP_SELF'].'?unsubscribe=yes&amp;class_id='.$class_id.'" onclick="javascript:if(!confirm(\''.addslashes(htmlentities(get_lang('ConfirmYourChoice'), ENT_NOQUOTES, 'gb2312')).'\')) return false;"><img src="../img/delete.gif"/></a>';
	return $result;
}
// Build search-form
$form = new FormValidator('search_class', 'get','','',null,false);
$renderer = & $form->defaultRenderer();
$renderer->setElementTemplate('<span>{element}</span> ');
$form->add_textfield('keyword', '', false);
$form->addElement('submit', 'submit', get_lang('SearchButton'));

// Build table
$table = new SortableTable('users', 'get_number_of_classes', 'get_class_data', 1);
$parameters['keyword'] = $_GET['keyword'];
$table->set_additional_parameters($parameters);
$col = 0;
$table->set_header($col ++, '', false);
$table->set_header($col ++, get_lang('ClassName'));
$table->set_header($col ++, get_lang('NumberOfUsers'));
if (api_is_allowed_to_edit())
{
	$table->set_header($col ++, '', false);
	$table->set_column_filter($col -1, 'reg_filter');
	$table->set_form_actions(array ('unsubscribe' => get_lang('Unreg')), 'class');
}
// Display form & table
$form->display();
echo '<br />';
$table->display();
/*
==============================================================================
		FOOTER
==============================================================================
*/
Display :: display_footer();
?>