<?php
/*
==============================================================================
	Dokeos - elearning and course management software

	Copyright (c) 2006-2008 Dokeos SPRL
	Copyright (c) 2006 Ghent University (UGent)

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

/**
*	These files are a complete rework of the forum. The database structure is
*	based on phpBB but all the code is rewritten. A lot of new functionalities
*	are added:
* 	- forum categories and forums can be sorted up or down, locked or made invisible
*	- consistent and integrated forum administration
* 	- forum options: 	are students allowed to edit their post?
* 						moderation of posts (approval)
* 						reply only forums (students cannot create new threads)
* 						multiple forums per group
*	- sticky messages
* 	- new view option: nested view
* 	- quoting a message
*
*	@Author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*	@Copyright Ghent University
*	@Copyright Patrick Cool
*
* 	@package dokeos.forum
*/

// name of the language file that needs to be included
$language_file = array('forum','document');

// including the global dokeos file
require '../inc/global.inc.php';

// the section (tabs)
$this_section=SECTION_COURSES;

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

// configuration for FCKeditor
$fck_attribute['Width'] = '100%';
$fck_attribute['Height'] = '400';

if(!api_is_allowed_to_edit(false,true)) {
	$fck_attribute['Config']['UserStatus'] = 'student';
	$fck_attribute['ToolbarSet'] = 'Forum_Student';
}
else
{
	$fck_attribute['ToolbarSet'] = 'Forum';
}

// including additional library scripts
require_once (api_get_path(LIBRARY_PATH).'formvalidator/FormValidator.class.php');
include_once (api_get_path(LIBRARY_PATH).'groupmanager.lib.php');
$nameTools=get_lang('Forum');

$origin = '';
if(isset($_GET['origin'])) {
	$origin =  Security::remove_XSS($_GET['origin']);
	$origin_string = '&origin='.$origin;
}

/*
-----------------------------------------------------------
	Including necessary files
-----------------------------------------------------------
*/
require 'forumconfig.inc.php';
require_once 'forumfunction.inc.php';


// javascript
$htmlHeadXtra[] = '<script>
		
		function advanced_parameters() {
			if(document.getElementById(\'id_qualify\').style.display == \'none\') {
				document.getElementById(\'id_qualify\').style.display = \'block\';
				document.getElementById(\'img_plus_and_minus\').innerHTML=\'&nbsp;'.Display::return_icon('div_hide.gif').'&nbsp;'.get_lang('AdvancedParameters').'\';

			} else {
				document.getElementById(\'id_qualify\').style.display = \'none\';
				document.getElementById(\'img_plus_and_minus\').innerHTML=\'&nbsp;'.Display::return_icon('div_show.gif').'&nbsp;'.get_lang('AdvancedParameters').'\';
			}	
		}
</script>';	
/*
==============================================================================
		MAIN DISPLAY SECTION
==============================================================================
*/
/*
-----------------------------------------------------------
	Retrieving forum and forum categorie information
-----------------------------------------------------------
*/
// we are getting all the information about the current forum and forum category.
// note pcool: I tried to use only one sql statement (and function) for this
// but the problem is that the visibility of the forum AND forum cateogory are stored in the item_property table
$current_thread=get_thread_information($_GET['thread']); // note: this has to be validated that it is an existing thread
$current_forum=get_forum_information($current_thread['forum_id']); // note: this has to be validated that it is an existing forum.
$current_forum_category=get_forumcategory_information($current_forum['forum_category']);

/*
-----------------------------------------------------------
	Breadcrumbs
-----------------------------------------------------------
*/
if (isset($_SESSION['gradebook'])){
	$gradebook=	$_SESSION['gradebook'];
}

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

if (!empty($_SESSION['toolgroup'])) {
	$_clean['toolgroup']=(int)$_SESSION['toolgroup'];
	$group_properties  = GroupManager :: get_group_properties($_clean['toolgroup']);
	$interbreadcrumb[] = array ("url" => "../group/group.php", "name" => get_lang('Groups'));
	$interbreadcrumb[] = array ("url" => "../group/group_space.php?gidReq=".$_SESSION['toolgroup'], "name"=> get_lang('GroupSpace').' ('.$group_properties['name'].')');
	$interbreadcrumb[]=array("url" => "viewforum.php?origin=".$origin."&forum=".Security::remove_XSS($_GET['forum']),"name" => $current_forum['forum_title']);
	$interbreadcrumb[]=array("url" => "viewthread.php?origin=".$origin."&gradebook=".$gradebook."&forum=".Security::remove_XSS($_GET['forum'])."&amp;thread=".Security::remove_XSS($_GET['thread']),"name" => $current_thread['thread_title']);
	$interbreadcrumb[]=array("url" => "#","name" => get_lang('Reply'));
	
} else {
	$interbreadcrumb[]=array("url" => "index.php?gradebook=$gradebook","name" => $nameTools);
	$interbreadcrumb[]=array("url" => "viewforumcategory.php?forumcategory=".$current_forum_category['cat_id'],"name" => $current_forum_category['cat_title']);
	$interbreadcrumb[]=array("url" => "viewforum.php?origin=".$origin."&forum=".Security::remove_XSS($_GET['forum']),"name" => $current_forum['forum_title']);
	$interbreadcrumb[]=array("url" => "viewthread.php?origin=".$origin."&gradebook=".$gradebook."&forum=".Security::remove_XSS($_GET['forum'])."&amp;thread=".Security::remove_XSS($_GET['thread']),"name" => $current_thread['thread_title']);
	$interbreadcrumb[]=array("url" => "#","name" => get_lang('Reply'));
}
/*
-----------------------------------------------------------
	Resource Linker
-----------------------------------------------------------
*/
if (isset($_POST['add_resources']) AND $_POST['add_resources']==get_lang('Resources')) {
	$_SESSION['formelements']=$_POST;
	$_SESSION['origin']=$_SERVER['REQUEST_URI'];
	$_SESSION['breadcrumbs']=$interbreadcrumb;
	header("Location: ../resourcelinker/resourcelinker.php");
}
/*
-----------------------------------------------------------
	Header
-----------------------------------------------------------
*/
if($origin=='learnpath') {
	include(api_get_path(INCLUDE_PATH).'reduced_header.inc.php');
} else {
	// the last element of the breadcrumb navigation is already set in interbreadcrumb, so give empty string
	Display :: display_header('');
	api_display_tool_title($nameTools);
}
/*
-----------------------------------------------------------
	Is the user allowed here?
-----------------------------------------------------------
*/
// The user is not allowed here if
// 1. the forumcategory, forum or thread is invisible (visibility==0
// 2. the forumcategory, forum or thread is locked (locked <>0)
// 3. if anonymous posts are not allowed
// The only exception is the course manager
// I have split this is several pieces for clarity.
//if (!api_is_allowed_to_edit() AND (($current_forum_category['visibility']==0 OR $current_forum['visibility']==0) OR ($current_forum_category['locked']<>0 OR $current_forum['locked']<>0 OR $current_thread['locked']<>0)))
if (!api_is_allowed_to_edit(false,true) AND (($current_forum_category['visibility']==0 OR $current_forum['visibility']==0))) {
	forum_not_allowed_here();
}
if (!api_is_allowed_to_edit(false,true) AND ($current_forum_category['locked']<>0 OR $current_forum['locked']<>0 OR $current_thread['locked']<>0)) {
	forum_not_allowed_here();
}
if (!$_user['user_id'] AND $current_forum['allow_anonymous']==0) {
	forum_not_allowed_here();
}
/*
-----------------------------------------------------------
	Action links
-----------------------------------------------------------
*/
if ($origin != 'learnpath') {
	echo '<div class="actions">';
	echo '<span style="float:right;">'.search_link().'</span>';
	echo '<a href="index.php?gradebook='.$gradebook.'">'.Display::return_icon('back.png',get_lang('BackToForumOverview')).' '.get_lang('BackToForumOverview').'</a>';
	echo '<a href="viewforum.php?forum='.Security::remove_XSS($_GET['forum']).'">'.Display::return_icon('forum.gif',get_lang('BackToForum')).' '.get_lang('BackToForum').'</a>';
	echo '<a href="viewthread.php?forum='.Security::remove_XSS($_GET['forum']).'&amp;gradebook='.$gradebook.'&amp;thread='.Security::remove_XSS($_GET['thread']).'">'.Display::return_icon('forumthread.gif',get_lang('BackToThread')).' '.get_lang('BackToThread').'</a>';
	echo '</div>';
} else {
	echo '<div style="height:15px">&nbsp;</div>';
}
/*
-----------------------------------------------------------
	Display Forum Category and the Forum information
-----------------------------------------------------------
*/
echo "<table class=\"data_table\" width='100%'>\n";

// the forum category
echo "\t<tr>\n\t\t<th style=\"padding-left:5px;\" align=\"left\" colspan=\"2\">";

echo '<span class="forum_title">'.prepare4display($current_thread['thread_title']).'</span><br />';

if (!empty ($current_forum_category['cat_title'])) {
	echo '<span class="forum_low_description">'.prepare4display($current_forum_category['cat_title'])." - </span>";
}
	
echo '<span class="forum_low_description">'.prepare4display($current_forum['forum_title']).'</span>';
echo "</th>\n";
echo "\t</tr>\n";
echo '</table>';

// the form for the reply
$my_action   = isset($_GET['action']) ? $_GET['action'] : '';
$my_post     = isset($_GET['post']) ? $_GET['post'] : '';
$my_elements = isset($_SESSION['formelements']) ? $_SESSION['formelements'] : '';
$values=show_add_post_form($my_action,$my_post, $my_elements); // note: this has to be cleaned first

if (!empty($values) AND isset($_POST['SubmitPost'])) {
	store_reply($values);
}

/*
==============================================================================
		FOOTER
==============================================================================
*/
if($origin!='learnpath') {
	Display :: display_footer();
}