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

	Copyright (c) 2006-2008 Dokeos S.A.
	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, rue du Corbeau, 108, 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 = 'forum';

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

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

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

// 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');


//are we in a lp ?
$origin = '';
if(isset($_GET['origin']))
{
	$origin =  Security::remove_XSS($_GET['origin']);
	$origin_string = '&origin='.$origin;
}

/*
-----------------------------------------------------------
	Including necessary files
-----------------------------------------------------------
*/
include('forumconfig.inc.php');
include('forumfunction.inc.php');


/*
==============================================================================
		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
$current_forum=get_forum_information($_GET['forum']); // note: this has to be validated that it is an existing forum.
$current_forum_category=get_forumcategory_information($current_forum['forum_category']);


/*
-----------------------------------------------------------
	Header and Breadcrumbs
-----------------------------------------------------------
*/
$interbreadcrumb[]=array("url" => "index.php?search=".Security::remove_XSS($_GET['search']),"name" => $nameTools);
$interbreadcrumb[]=array("url" => "viewforumcategory.php?forumcategory=".$current_forum_category['cat_id']."&amp;search=".Security::remove_XSS(urlencode($_GET['search'])),"name" => prepare4display($current_forum_category['cat_title']));
$interbreadcrumb[]=array("url" => "viewforum.php?forum=".Security::remove_XSS($_GET['forum'])."&amp;search=".Security::remove_XSS(urlencode($_GET['search'])),"name" => prepare4display($current_forum['forum_title']));
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);
}

//echo '<link href="forumstyles.css" rel="stylesheet" type="text/css" />';

/*
-----------------------------------------------------------
	Actions
-----------------------------------------------------------
*/
// Change visibility of a forum or a forum category
if (($_GET['action']=='invisible' OR $_GET['action']=='visible') AND isset($_GET['content']) AND isset($_GET['id']) AND api_is_allowed_to_edit())
{
	$message=change_visibility($_GET['content'], $_GET['id'],$_GET['action']);// note: this has to be cleaned first
}
// locking and unlocking
if (($_GET['action']=='lock' OR $_GET['action']=='unlock') AND isset($_GET['content']) AND isset($_GET['id']) AND api_is_allowed_to_edit())
{
	$message=change_lock_status($_GET['content'], $_GET['id'],$_GET['action']);// note: this has to be cleaned first
}
// deleting
if ($_GET['action']=='delete'  AND isset($_GET['content']) AND isset($_GET['id']) AND api_is_allowed_to_edit())
{
	$message=delete_forum_forumcategory_thread($_GET['content'],$_GET['id']); // note: this has to be cleaned first
}
// moving
if ($_GET['action']=='move' and isset($_GET['thread']) AND api_is_allowed_to_edit())
{
	$message=move_thread_form();
}
// notification
if ($_GET['action'] == 'notify' AND isset($_GET['content']) AND isset($_GET['id']))
{
	$return_message = set_notification($_GET['content'],$_GET['id']);
	Display :: display_confirmation_message($return_message,false);
}

/*
-----------------------------------------------------------
	Is the user allowed here?
-----------------------------------------------------------
*/
// if the user is not a course administrator and the forum is hidden
// then the user is not allowed here.
if (!api_is_allowed_to_edit() AND ($current_forum_category['visibility']==0 OR $current_forum['visibility']==0))
{
	forum_not_allowed_here();
}


/*
-----------------------------------------------------------
	Display the action messages
-----------------------------------------------------------
*/
if (isset($message))
{
	Display :: display_confirmation_message($message);
}


/*
-----------------------------------------------------------
	Action Links
-----------------------------------------------------------
*/
echo '<span style="float:right;">'.search_link().'</span>';
// The link should appear when
// 1. the course admin is here
// 2. the course member is here and new threads are allowed
// 3. a visitor is here and new threads AND allowed AND  anonymous posts are allowed
if (api_is_allowed_to_edit() OR ($current_forum['allow_new_threads']==1 AND isset($_user['user_id'])) OR ($current_forum['allow_new_threads']==1 AND !isset($_user['user_id']) AND $current_forum['allow_anonymous']==1))
{
	if ($current_forum['locked'] <> 1 AND $current_forum['locked'] <> 1)
	{
	echo '<a href="newthread.php?'.api_get_cidreq().'&forum='.Security::remove_XSS($_GET['forum']).$origin_string.'">'.Display::return_icon('forumthread_new.gif').' '.get_lang('NewTopic').'</a>';
	}
	else
	{
		echo get_lang('ForumLocked');
	}
}

/*
-----------------------------------------------------------
					Display
-----------------------------------------------------------
*/
echo "<table class=\"data_table\" width='100%'>\n";

// the current forum 
if($origin != 'learnpath')
{
	echo "\t<tr>\n\t\t<th style=\"padding-left:5px;\" align=\"left\" colspan=\"7\">";	
	echo '<span class="forum_title">'.prepare4display($current_forum['forum_title']).'</span>';
		
	if (!empty ($current_forum['forum_comment'])) 
	{
		echo '<br><span class="forum_description">'.prepare4display($current_forum['forum_comment']).'</span>';
	}
	
	if (!empty ($current_forum_category['cat_title'])) 
	{
		echo '<br /><span class="forum_low_description">'.prepare4display($current_forum_category['cat_title'])."</span><br />";
	}
	
	echo "</th>\n";
	echo "\t</tr>\n";
}

echo "</th>\n";
echo "\t</tr>\n";

// The column headers (to do: make this sortable)
echo "\t<tr class=\"forum_threadheader\">\n";
echo "\t\t<td></td>\n";
echo "\t\t<td>".get_lang('Title')."</td>\n";
echo "\t\t<td>".get_lang('Replies')."</td>\n";
echo "\t\t<td>".get_lang('Views')."</td>\n";
echo "\t\t<td>".get_lang('Author')."</td>\n";
echo "\t\t<td>".get_lang('LastPost')."</td>\n";
echo "\t\t<td>".get_lang('Actions')."</td>\n";
echo "\t</tr>\n";

// getting al the threads
$threads=get_threads($_GET['forum']); // note: this has to be cleaned first

$whatsnew_post_info=$_SESSION['whatsnew_post_info'];

$counter=0;
if(is_array($threads))
{
	foreach ($threads as $row)
	{
		// thread who have no replies yet and the only post is invisible should not be displayed to students.
		if (api_is_allowed_to_edit() OR  !($row['thread_replies']=='0' AND $row['visible']=='0'))
		{
			if($counter%2==0)
			{
				 $class="row_odd";
			}
			else
			{
				$class="row_even";
			}
			echo "\t<tr class=\"$class\">\n";
			echo "\t\t<td>";
			if (is_array($whatsnew_post_info[$_GET['forum']][$row['thread_id']]) and !empty($whatsnew_post_info[$_GET['forum']][$row['thread_id']]))
			{
				echo icon('../img/forumthread.gif');
			}
			else
			{
				echo icon('../img/forumthread.gif');
			}
	
			if ($row['thread_sticky']==1)
			{
				echo icon('../img/exclamation.gif');
			}
			echo "</td>\n";
			echo "\t\t<td>";			
			echo "<a href=\"viewthread.php?".api_get_cidreq()."&forum=".Security::remove_XSS($_GET['forum'])."&amp;thread=".$row['thread_id'].$origin_string."&amp;search=".Security::remove_XSS(urlencode($_GET['search']))."\" ".class_visible_invisible($row['visibility']).">".prepare4display($row['thread_title'])."</a></td>\n";
			echo "\t\t<td>".$row['thread_replies']."</td>\n";
			if ($row['user_id']=='0')
			{
				$name=prepare4display($row['thread_poster_name']);
			}
			else
			{
				$name=$row['firstname'].' '.$row['lastname'];
			}			
			echo "\t\t<td>".$row['thread_views']."</td>\n";
			
			if ($row['last_poster_user_id']=='0')
			{
				$name=$row['poster_name'];  
			}
			else
			{
				$name=$row['last_poster_firstname'].' '.$row['last_poster_lastname'];
			}
			
			if($origin != 'learnpath')
			{
				echo "\t\t<td>".display_user_link($row['user_id'], $name)."</td>\n";
			}
			else
			{
				echo "\t\t<td>".$name."</td>\n";
			}
			
			// if the last post is invisible and it is not the teacher who is looking then we have to find the last visible post of the thread
			if (($row['visible']=='1' OR api_is_allowed_to_edit()) && $origin!='learnpath')
			{
				$last_post=$row['thread_date']." ".get_lang('By').' '.display_user_link($row['last_poster_user_id'], $name);
			}
			else if($origin!='learnpath')
			{
				$last_post_sql="SELECT post.*, user.firstname, user.lastname FROM $table_posts post, $table_users user WHERE post.poster_id=user.user_id AND visible='1' AND thread_id='".$row['thread_id']."' ORDER BY post_id DESC";
				$last_post_result=api_sql_query($last_post_sql, __LINE__, __FILE__);
				$last_post_row=mysql_fetch_array($last_post_result);
				$name=$last_post_row['firstname'].' '.$last_post_row['lastname'];
				$last_post=$last_post_row['post_date']." ".get_lang('By').' '.display_user_link($last_post_row['poster_id'], $name);
			}
			else
			{
				$last_post_sql="SELECT post.*, user.firstname, user.lastname FROM $table_posts post, $table_users user WHERE post.poster_id=user.user_id AND visible='1' AND thread_id='".$row['thread_id']."' ORDER BY post_id DESC";
				$last_post_result=api_sql_query($last_post_sql, __LINE__, __FILE__);
				$last_post_row=mysql_fetch_array($last_post_result);
				$name=$last_post_row['firstname'].' '.$last_post_row['lastname'];
				$last_post=$last_post_row['post_date']." ".get_lang('By').' '.$name;
			}
			echo "\t\t<td>".$last_post."</td>\n";
			echo "\t\t<td>";			
			if (api_is_allowed_to_edit())
			{
				echo "<a href=\"".api_get_self()."?".api_get_cidreq()."&forum=".Security::remove_XSS($_GET['forum'])."&amp;action=delete&amp;content=thread&amp;id=".$row['thread_id'].$origin_string."\" onclick=\"javascript:if(!confirm('".addslashes(htmlentities(get_lang("DeleteCompleteThread"),ENT_QUOTES,$charset))."')) return false;\">".icon('../img/delete.gif',get_lang('Delete'))."</a>";
				display_visible_invisible_icon('thread', $row['thread_id'], $row['visibility'], array("forum"=>$_GET['forum'],'origin'=>$origin));
				display_lock_unlock_icon('thread',$row['thread_id'], $row['locked'], array("forum"=>$_GET['forum'],'origin'=>$origin));
				echo "<a href=\"viewforum.php?".api_get_cidreq()."&forum=".Security::remove_XSS($_GET['forum'])."&amp;action=move&amp;thread=".$row['thread_id'].$origin_string."\">".icon('../img/deplacer_fichier.gif',get_lang('MoveThread'))."</a>";
			}
			$iconnotify = 'send_mail.gif';
			if (is_array($_SESSION['forum_notification']['thread']))
			{
				if (in_array($row['thread_id'],$_SESSION['forum_notification']['thread']))
				{
					$iconnotify = 'send_mail_checked.gif';
				}
			}
			echo "<a href=\"".api_get_self()."?".api_get_cidreq()."&amp;forum=".Security::remove_XSS($_GET['forum'])."&amp;action=notify&amp;content=thread&amp;id=".$row['thread_id']."\">".icon('../img/'.$iconnotify,get_lang('NotifyMe'))."</a>";			
			echo "</td>\n";
			echo "\t</tr>\n";
		}
		$counter++;


	}
}

echo "</table>";

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