chamilo-lms2/main/inc/lib/blog.lib.php

<?php
/* For licensing terms, see /license.txt */
/**
 * Blog class
 * Contains several functions dealing with displaying,
 * editing,... of a blog
 *
 * @version 1.0
 * @package chamilo.blogs
 * @author Toon Keppens <toon@vi-host.net>
 * @author Julio Montoya - Cleaning code
 *
 */
/**
 * Class
 * @package chamilo.blogs
 */
class Blog {
	/**
	 * Get the title of a blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 *
	 * @return String Blog Title
	 */
	public static function get_blog_title ($blog_id) {
	    $course_id = api_get_course_int_id();

		if(is_numeric($blog_id)) {
			// init
			$tbl_blogs = Database::get_course_table(TABLE_BLOGS);

			$sql = "SELECT blog_name
					FROM " . $tbl_blogs . "
					WHERE c_id = $course_id AND blog_id = " . intval($blog_id);

			$result = Database::query($sql);
			$blog = Database::fetch_array($result);
			return stripslashes($blog['blog_name']);
		}
	}


	/**
	 * Get the description of a blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 *
	 * @return String Blog description
	 */
	public static function get_blog_subtitle ($blog_id) {
		// init
		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);
          $course_id = api_get_course_int_id();
		$sql = "SELECT blog_subtitle FROM $tbl_blogs WHERE c_id = $course_id AND blog_id ='".intval($blog_id)."'";
		$result = Database::query($sql);
		$blog = Database::fetch_array($result);
		return stripslashes($blog['blog_subtitle']);
	}


	/**
	 * Get the users of a blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 *
	 * @return Array Returns an array with [userid]=>[username]
	 */
	public static function get_blog_users ($blog_id) {
		// Database table definitions
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user = Database::get_course_table(TABLE_BLOGS_REL_USER);

		$course_id = api_get_course_int_id();

		// Get blog members
		$sql = "SELECT user.user_id, user.firstname, user.lastname
				FROM " . $tbl_blogs_rel_user . " blogs_rel_user INNER JOIN " . $tbl_users . " user ON blogs_rel_user.user_id = user.user_id
				WHERE	blogs_rel_user.c_id = $course_id AND
						blogs_rel_user.blog_id = '" . (int)$blog_id."'";
		$result = Database::query($sql);
		$blog_members = array ();
		while($user = Database::fetch_array($result)) {
			$blog_members[$user['user_id']] = api_get_person_name($user['firstname'], $user['lastname']);
		}

		return $blog_members;
	}

	/**
	 * Creates a new blog in the given course
	 * @author Toon Keppens
	 * @param Integer $course_id Id
	 * @param String $title
	 * @param Text $description
	 */
	public static function create_blog ($title, $subtitle) {
		global $_user;

        $course_id = api_get_course_int_id();

		$current_date=date('Y-m-d H:i:s',time());
		$session_id = api_get_session_id();
		// Tabel definitions
		$tbl_blogs 			= Database::get_course_table(TABLE_BLOGS);
		$tbl_tool 			= Database::get_course_table(TABLE_TOOL_LIST);
		$tbl_blogs_posts 	= Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_tasks 	= Database::get_course_table(TABLE_BLOGS_TASKS);

		//verified if exist blog
		$sql='SELECT COUNT(*) as count FROM '.$tbl_blogs.'  WHERE c_id = '.$course_id.' AND blog_name="'.Database::escape_string($title).'" AND blog_subtitle="'.Database::escape_string($subtitle).'";';
		$res=Database::query($sql);
		$info_count=Database::result($res,0,0);

		if ($info_count==0) {
			// Create the blog
			$sql = "INSERT INTO $tbl_blogs (c_id, blog_name, blog_subtitle, date_creation, visibility, session_id )
					VALUES ($course_id, '".Database::escape_string($title)."', '".Database::escape_string($subtitle)."', '".$current_date."', '1', '$session_id');";
			Database::query($sql);
			$this_blog_id = Database::insert_id();

			if ($this_blog_id > 0) {
				//insert into item_property
				api_item_property_update(api_get_course_info(), TOOL_BLOGS, $this_blog_id, 'BlogAdded', api_get_user_id());
			}

			// Make first post. :)
			$sql = "INSERT INTO $tbl_blogs_posts (c_id, title, full_text, date_creation, blog_id, author_id )
						VALUES ($course_id, '".get_lang("Welcome")."', '" . get_lang('FirstPostText')."','".$current_date."', '".Database::escape_string((int)$this_blog_id)."', '".Database::escape_string((int)$_user['user_id'])."');";
			Database::query($sql);

			// Put it on course homepage
			$sql = "INSERT INTO $tbl_tool (c_id, name, link, image, visibility, admin, address, added_tool, session_id)
						VALUES ($course_id, '".Database::escape_string($title)."','blog/blog.php?blog_id=".(int)$this_blog_id."','blog.gif','1','0','pastillegris.gif',0,'$session_id')";
			Database::query($sql);

			// Subscribe the teacher to this blog
			Blog::set_user_subscribed((int)$this_blog_id,(int)$_user['user_id']);
		}
	}

	/**
	 * Update title and subtitle of a blog in the given course
	 * @author Toon Keppens
	 * @param Integer $course_id Id
	 * @param String $title
	 * @param Text $description
	 */
	public static function edit_blog ($blog_id, $title, $subtitle) {
		global $_user;

		// Table definitions
		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);
		$tbl_tool = Database::get_course_table(TABLE_TOOL_LIST);

        $course_id = api_get_course_int_id();

		// Update the blog
		$sql = "UPDATE $tbl_blogs SET blog_name = '".Database::escape_string($title)."',	blog_subtitle = '".Database::escape_string($subtitle)."'
		        WHERE c_id = $course_id AND blog_id ='".Database::escape_string((int)$blog_id)."' LIMIT 1";
		Database::query($sql);
		$this_blog_id = Database::insert_id();

		//update item_property (update)
		api_item_property_update(api_get_course_info(), TOOL_BLOGS, intval($blog_id), 'BlogUpdated', api_get_user_id());

		// Update course homepage link
		$sql = "UPDATE $tbl_tool SET name = '".Database::escape_string($title)."' WHERE c_id = $course_id AND link = 'blog/blog.php?blog_id=".Database::escape_string((int)$blog_id)."' LIMIT 1";
		Database::query($sql);
	}

	/**
	 * Deletes a blog and it's posts from the course database
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 */
	public static function delete_blog ($blog_id) {
		// Init
		$tbl_blogs 			= Database::get_course_table(TABLE_BLOGS);
		$tbl_blogs_posts 	= Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_comment 	= Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_blogs_tasks 	= Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_tool 			= Database::get_course_table(TABLE_TOOL_LIST);
		$tbl_blogs_rating 	= Database::get_course_table(TABLE_BLOGS_RATING);
		$tbl_blogs_attachment = Database::get_course_table(TABLE_BLOGS_ATTACHMENT);

        $course_id = api_get_course_int_id();

		// Delete posts from DB and the attachments
		delete_all_blog_attachment($blog_id);

		//Delete comments
		$sql = "DELETE FROM $tbl_blogs_comment WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."'";
   		Database::query($sql);

		// Delete posts
   		$sql = "DELETE FROM $tbl_blogs_posts WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."'";
   		Database::query($sql);

		// Delete tasks
		$sql = "DELETE FROM $tbl_blogs_tasks WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."'";
		Database::query($sql);

		// Delete ratings
		$sql = "DELETE FROM $tbl_blogs_rating WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."'";
		Database::query($sql);

		// Delete blog
		$sql ="DELETE FROM $tbl_blogs WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."'";
		Database::query($sql);

		// Delete from course homepage
		$sql = "DELETE FROM $tbl_tool WHERE c_id = $course_id AND link = 'blog/blog.php?blog_id=".(int)$blog_id."'";
		Database::query($sql);

		//update item_property (delete)
		api_item_property_update(api_get_course_info(), TOOL_BLOGS, intval($blog_id), 'delete', api_get_user_id());
	}

	/**
	 * Creates a new post in a given blog
	 * @author Toon Keppens
	 * @param String $title
	 * @param String $full_text
	 * @param Integer $blog_id
	 */
	public static function create_post ($title, $full_text, $file_comment, $blog_id) {
		global $_user;
		global $_course;

		$blog_table_attachment = Database::get_course_table(TABLE_BLOGS_ATTACHMENT);
		$upload_ok=true;
		$has_attachment=false;
		$current_date=date('Y-m-d H:i:s',time());

		$course_id = api_get_course_int_id();


		if(!empty($_FILES['user_upload']['name'])) {
			require_once 'fileUpload.lib.php';
			$upload_ok = process_uploaded_file($_FILES['user_upload']);
			$has_attachment=true;
		}

		if ($upload_ok) {
			// Table Definitions
			$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);

			// Create the post
			$sql = "INSERT INTO $tbl_blogs_posts (c_id, title, full_text, date_creation, blog_id, author_id )
					VALUES ($course_id, '".Database::escape_string($title)."', '".Database::escape_string($full_text)."','".$current_date."', '".(int)$blog_id."', '".(int)$_user['user_id']."');";

			Database::query($sql);
			$last_post_id=Database::insert_id();

			if ($has_attachment) {
				$courseDir   = $_course['path'].'/upload/blog';
				$sys_course_path = api_get_path(SYS_COURSE_PATH);
				$updir = $sys_course_path.$courseDir;

				// Try to add an extension to the file if it hasn't one
				$new_file_name = add_ext_on_mime(stripslashes($_FILES['user_upload']['name']), $_FILES['user_upload']['type']);

				// user's file name
				$file_name =$_FILES['user_upload']['name'];

				if (!filter_extension($new_file_name)) {
					Display :: display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
				} else {
					$new_file_name = uniqid('');
					$new_path=$updir.'/'.$new_file_name;
					$result= @move_uploaded_file($_FILES['user_upload']['tmp_name'], $new_path);
					$comment=Database::escape_string($file_comment);

					// Storing the attachments if any
					if ($result) {
						$sql='INSERT INTO '.$blog_table_attachment.'(c_id, filename,comment, path, post_id,size, blog_id,comment_id) '.
							 "VALUES ($course_id, '".Database::escape_string($file_name)."', '".$comment."', '".Database::escape_string($new_file_name)."' , '".$last_post_id."', '".intval($_FILES['user_upload']['size'])."',  '".$blog_id."', '0' )";
						$result=Database::query($sql);
						$message.=' / '.get_lang('AttachmentUpload');
					}
				}
			}
		} else {
			Display::display_error_message(get_lang('UplNoFileUploaded'));
		}
	}

	/**
	 * Edits a post in a given blog
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 * @param String $title
	 * @param String $full_text
	 * @param Integer $blog_id
	 */
	public static function edit_post ($post_id, $title, $full_text, $blog_id) {
		// Init
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
        $course_id = api_get_course_int_id();

		// Create the post
		$sql = "UPDATE $tbl_blogs_posts SET title = '" . Database::escape_string($title)."', full_text = '" . Database::escape_string($full_text)."'
		        WHERE c_id = $course_id AND post_id ='".(int)$post_id."' AND blog_id ='".(int)$blog_id."' LIMIT 1 ;";
		Database::query($sql);
	}

	/**
	 * Deletes an article and it's comments
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 * @param Integer $post_id
	 */
	public static function delete_post($blog_id, $post_id) {
		// Init
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_blogs_rating = Database::get_course_table(TABLE_BLOGS_RATING);

        $course_id = api_get_course_int_id();

		// Delete ratings on this comment
		$sql = "DELETE FROM $tbl_blogs_rating WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND item_id = '".(int)$post_id."' AND rating_type = 'post'";
		Database::query($sql);

		// Delete the post
		$sql = "DELETE FROM $tbl_blogs_posts WHERE c_id = $course_id AND post_id = '".(int)$post_id."'";
		Database::query($sql);

		// Delete the comments
		$sql = "DELETE FROM $tbl_blogs_comments WHERE c_id = $course_id AND post_id = '".(int)$post_id."' AND blog_id = '".(int)$blog_id."'";
		Database::query($sql);

		// Delete posts and attachments
		delete_all_blog_attachment($blog_id,$post_id);
	}

	/**
	 * Creates a comment on a post in a given blog
	 * @author Toon Keppens
	 * @param String $title
	 * @param String $full_text
	 * @param Integer $blog_id
	 * @param Integer $post_id
	 * @param Integer $parent_id
	 */
	public static function create_comment($title, $full_text, $file_comment,$blog_id, $post_id, $parent_id, $task_id = 'NULL') {
		global $_user;
		global $_course;
		global $blog_table_attachment;

		$upload_ok			= true;
		$has_attachment		= false;
		$current_date		= date('Y-m-d H:i:s',time());
		$course_id 			= api_get_course_int_id();

		if(!empty($_FILES['user_upload']['name'])) {
			require_once('fileUpload.lib.php');
			$upload_ok = process_uploaded_file($_FILES['user_upload']);
			$has_attachment=true;
		}

		if ($upload_ok) {
			// Table Definition
			$tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);

			// Create the comment
			$sql = "INSERT INTO $tbl_blogs_comments (c_id, title, comment, author_id, date_creation, blog_id, post_id, parent_comment_id, task_id )
					VALUES ($course_id, '".Database::escape_string($title)."', '".Database::escape_string($full_text)."', '".(int)$_user['user_id']."','".$current_date."', '".(int)$blog_id."', '".(int)$post_id."', '".(int)$parent_id."', '".(int)$task_id."')";
			Database::query($sql);

			// Empty post values, or they are shown on the page again
			$_POST['comment_title'] = "";
			$_POST['comment_text'] = "";

			$last_id=Database::insert_id();

			if ($has_attachment) {
				$courseDir   = $_course['path'].'/upload/blog';
				$sys_course_path = api_get_path(SYS_COURSE_PATH);
				$updir = $sys_course_path.$courseDir;

				// Try to add an extension to the file if it hasn't one
				$new_file_name = add_ext_on_mime(stripslashes($_FILES['user_upload']['name']), $_FILES['user_upload']['type']);

				// user's file name
				$file_name =$_FILES['user_upload']['name'];

				if (!filter_extension($new_file_name))
				{
					Display :: display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
				}
				else
				{
					$new_file_name = uniqid('');
					$new_path=$updir.'/'.$new_file_name;
					$result= @move_uploaded_file($_FILES['user_upload']['tmp_name'], $new_path);
					$comment=Database::escape_string($file_comment);

					// Storing the attachments if any
					if ($result)
					{
						$sql='INSERT INTO '.$blog_table_attachment.'(c_id, filename,comment, path, post_id,size,blog_id,comment_id) '.
							 "VALUES ($course_id, '".Database::escape_string($file_name)."', '".$comment."', '".Database::escape_string($new_file_name)."' , '".$post_id."', '".$_FILES['user_upload']['size']."',  '".$blog_id."', '".$last_id."'  )";
						$result=Database::query($sql);
						$message.=' / '.get_lang('AttachmentUpload');
					}
				}
			}
		}
	}

	/**
	 * Deletes a comment from a blogpost
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 * @param Integer $comment_id
	 */
	public static function delete_comment ($blog_id, $post_id, $comment_id) {
		// Init
		$tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_blogs_rating = Database::get_course_table(TABLE_BLOGS_RATING);
		$blog_id = intval($blog_id);
		$post_id = intval($post_id);
		$comment_id = intval($comment_id);

        $course_id = api_get_course_int_id();

		delete_all_blog_attachment($blog_id,$post_id,$comment_id);

		// Delete ratings on this comment
		$sql = "DELETE FROM $tbl_blogs_rating WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND item_id = '".(int)$comment_id."' AND rating_type = 'comment'";
		Database::query($sql);

		// select comments that have the selected comment as their parent
		$sql = "SELECT comment_id FROM $tbl_blogs_comments WHERE c_id = $course_id AND parent_comment_id = '".(int)$comment_id."'";
		$result = Database::query($sql);

		// Delete them recursively
		while($comment = Database::fetch_array($result)) {
			Blog::delete_comment($blog_id,$post_id,$comment['comment_id']);
		}

		// Finally, delete the selected comment to
		$sql = "DELETE FROM $tbl_blogs_comments WHERE c_id = $course_id AND comment_id = '".(int)$comment_id."'";
		Database::query($sql);
	}

	/**
	 * Creates a new task in a blog
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 * @param String $title
	 * @param String $description
	 * @param String $color
	 */
	public static function create_task ($blog_id, $title, $description, $articleDelete, $articleEdit, $commentsDelete, $color) {
		// Init
		$tbl_blogs_tasks       = Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_tasks_permissions = Database::get_course_table(TABLE_BLOGS_TASKS_PERMISSIONS);

		$course_id = api_get_course_int_id();

		// Create the task
		$sql = "INSERT INTO $tbl_blogs_tasks (c_id, blog_id, title, description, color, system_task )
				VALUES ($course_id , '".(int)$blog_id."', '" . Database::escape_string($title)."', '" . Database::escape_string($description)."', '" . Database::escape_string($color)."', '0');";
		Database::query($sql);

		$task_id = Database::insert_id();
		$tool = 'BLOG_' . $blog_id;

		if ($articleDelete == 'on') {
			$sql = " INSERT INTO " . $tbl_tasks_permissions . " ( c_id,  task_id, tool, action) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_delete'
				)";
			Database::query($sql);
		}

		if($articleEdit == 'on') {
			$sql = "
				INSERT INTO " . $tbl_tasks_permissions . " (c_id, task_id, tool, action ) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_edit'
				)";
			Database::query($sql);
		}

		if($commentsDelete == 'on') {
			$sql = "
				INSERT INTO " . $tbl_tasks_permissions . " (c_id, task_id, tool, action ) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_comments_delete'
				)";

			Database::query($sql);
		}
	}

	/**
	 * Edit a task in a blog
	 * @author Toon Keppens
	 * @param Integer $task_id
	 * @param String $title
	 * @param String $description
	 * @param String $color
	 */
	public static function edit_task($blog_id, $task_id, $title, $description, $articleDelete, $articleEdit, $commentsDelete, $color) {
		// Init
		$tbl_blogs_tasks       = Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_tasks_permissions = Database::get_course_table(TABLE_BLOGS_TASKS_PERMISSIONS);

        $course_id = api_get_course_int_id();


		// Create the task
		$sql = "UPDATE $tbl_blogs_tasks SET
					title = '".Database::escape_string($title)."',
					description = '".Database::escape_string($description)."',
					color = '".Database::escape_string($color)."'
				WHERE c_id = $course_id AND task_id ='".(int)$task_id."' LIMIT 1";
		Database::query($sql);

		$tool = 'BLOG_' . $blog_id;

		$sql = "DELETE FROM " . $tbl_tasks_permissions . " WHERE c_id = $course_id AND task_id = '" . (int)$task_id."'";
		Database::query($sql);

		if ($articleDelete == 'on') {
			$sql = "INSERT INTO " . $tbl_tasks_permissions . " ( c_id, task_id, tool, action) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_delete'
				)";

			Database::query($sql);
		}

		if($articleEdit == 'on') {
			$sql = "INSERT INTO " . $tbl_tasks_permissions . " (c_id, task_id, tool, action) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_edit'
				)";
			Database::query($sql);
		}

		if($commentsDelete == 'on') {
			$sql = " INSERT INTO " . $tbl_tasks_permissions . " (c_id, task_id, tool, action) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($tool) . "',
					'article_comments_delete'
				)";
			Database::query($sql);
		}
	}

	/**
	 * Deletes a task from a blog
	 * @param Integer $blog_id
	 * @param Integer $task_id
	 */
	public static function delete_task ($blog_id, $task_id) {
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
		$course_id = api_get_course_int_id();

		// Delete posts
		$sql = "DELETE FROM $tbl_blogs_tasks WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND task_id = '".(int)$task_id."'";
		Database::query($sql);
	}

	/**
	 * Deletes an assigned task from a blog
	 * @param Integer $blog_id
	 * @param Integer $assignment_id
	 */
	public static function delete_assigned_task ($blog_id, $task_id,$user_id) {
		$tbl_blogs_tasks_rel_user = Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);
        $course_id = api_get_course_int_id();

		// Delete posts
		$sql = "DELETE FROM $tbl_blogs_tasks_rel_user WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND task_id = '".(int)$task_id."' AND user_id = '".(int)$user_id."'";
		Database::query($sql);
	}

	/**
	 * Get personal task list
	 * @author Toon Keppens
	 * @return Returns an unsorted list (<ul></ul>) with the users' tasks
	 */
	public static function get_personal_task_list () {
		global $_user;

		// Init
		$tbl_blogs 					= Database::get_course_table(TABLE_BLOGS);
		$tbl_blogs_tasks_rel_user 	= Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);
		$tbl_blogs_tasks 			= Database::get_course_table(TABLE_BLOGS_TASKS);

		$course_id = api_get_course_int_id();

		if($_user['user_id']) {
			$sql = "SELECT task_rel_user.*, task.title, blog.blog_name FROM $tbl_blogs_tasks_rel_user task_rel_user
			INNER JOIN $tbl_blogs_tasks task ON task_rel_user.task_id = task.task_id
			INNER JOIN $tbl_blogs blog ON task_rel_user.blog_id = blog.blog_id
			AND blog.blog_id = ".intval($_GET['blog_id'])."
			WHERE
				task.c_id = $course_id AND
				blog.c_id = $course_id AND
				task_rel_user.c_id = $course_id AND
				task_rel_user.user_id = ".(int)$_user['user_id']."
			ORDER BY target_date ASC";

			$result = Database::query($sql);

			if (Database::num_rows($result) > 0) {
				echo '<ul>';
				while($mytask = Database::fetch_array($result)) {
					echo '<li><a href="blog.php?action=execute_task&amp;blog_id=' . $mytask['blog_id'] . '&amp;task_id='.stripslashes($mytask['task_id']) . '" title="[Blog: '.stripslashes($mytask['blog_name']) . '] ' . get_lang('ExecuteThisTask') . '">'.stripslashes($mytask['title']) . '</a></li>';
				}
				echo '<ul>';
			}
			else
			{
				echo get_lang('NoTasks');
			}
		}
		else
		{
			echo get_lang('NoTasks');
		}

	}

	/**
	 * Changes the visibility of a blog
	 * @author Toon Keppens
	 * @param Integer $blog_id
	 */
	public static function change_blog_visibility ($blog_id) {
		// Init
		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);
		$tbl_tool = Database::get_course_table(TABLE_TOOL_LIST);
		$course_id = api_get_course_int_id();

		// Get blog properties
		$sql = "SELECT blog_name, visibility FROM $tbl_blogs WHERE c_id = $course_id AND blog_id='".(int)$blog_id."'";
		$result = Database::query($sql);
		$blog = Database::fetch_array($result);
		$visibility = $blog['visibility'];
		$title = $blog['blog_name'];

		if($visibility == 1)
		{
			// Change visibility state, remove from course home.
			$sql = "UPDATE $tbl_blogs SET visibility = '0' WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."' LIMIT 1";
			$result = Database::query($sql);

			$sql = "DELETE FROM $tbl_tool WHERE c_id = $course_id AND name = '".Database::escape_string($title)."' LIMIT 1";
			$result = Database::query($sql);
		}
		else
		{
			// Change visibility state, add to course home.
			$sql = "UPDATE $tbl_blogs SET visibility = '1' WHERE c_id = $course_id AND blog_id ='".(int)$blog_id."' LIMIT 1";
			$result = Database::query($sql);

			$sql = "INSERT INTO $tbl_tool (c_id, name, link, image, visibility, admin, address, added_tool, target )
					VALUES ($course_id, '".Database::escape_string($title)."', 'blog/blog.php?blog_id=".(int)$blog_id."', 'blog.gif', '1', '0', 'pastillegris.gif', '0', '_self')";
			$result = Database::query($sql);
		}
	}


	/**
	 * Shows the posts of a blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_blog_posts ($blog_id, $filter = '1=1', $max_number_of_posts = 20) {
		// Init
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		global $dateFormatLong;

		$course_id = api_get_course_int_id();

		// Get posts and authors
		$sql = "SELECT post.*, user.lastname, user.firstname, user.username FROM $tbl_blogs_posts post
					INNER JOIN $tbl_users user ON post.author_id = user.user_id
				WHERE 	post.blog_id = '".(int)$blog_id."' AND
						post.c_id = $course_id AND
						$filter
				ORDER BY post_id DESC LIMIT 0,".(int)$max_number_of_posts;
		$result = Database::query($sql);

		// Display
		if(Database::num_rows($result) > 0) {
		    $limit = 200;
			while($blog_post = Database::fetch_array($result)) {
				// Get number of comments
				$sql = "SELECT COUNT(1) as number_of_comments FROM $tbl_blogs_comments WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND post_id = '" . (int)$blog_post['post_id']."'";
				$tmp = Database::query($sql);
				$blog_post_comments = Database::fetch_array($tmp);

				// Prepare data
				$blog_post_id = $blog_post['post_id'];
				$blog_post_text = make_clickable(stripslashes($blog_post['full_text']));
				$blog_post_date = api_convert_and_format_date($blog_post['date_creation'], null, date_default_timezone_get());

				// Create an introduction text (but keep FULL sentences)

				$introduction_text = "";
				$words = 0;
				$blog_post_text_cut = cut($blog_post_text, $limit) ;
				$words = strlen($blog_post_text);

				if ($words >= $limit) {
					$readMoreLink = ' <div class="link" onclick="document.getElementById(\'blogpost_text_' . $blog_post_id . '\').style.display=\'block\'; document.getElementById(\'blogpost_introduction_' . $blog_post_id . '\').style.display=\'none\'">' . get_lang('ReadMore') . '</div>';
					$introduction_text = $blog_post_text_cut;
				} else {
				    $introduction_text = $blog_post_text;
					$readMoreLink = '';
				}

				$introduction_text = stripslashes($introduction_text);

				echo '<div class="blogpost">';
				echo '<span class="blogpost_title"><a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $blog_post['post_id'] . '#add_comment" title="' . get_lang('ReadPost') . '" >'.stripslashes($blog_post['title']) . '</a></span>';
				echo '<span class="blogpost_date"><a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $blog_post['post_id'] . '#add_comment" title="' . get_lang('ReadPost') . '" >' . $blog_post_date . '</a></span>';
				echo '<div class="blogpost_introduction" id="blogpost_introduction_'.$blog_post_id.'">' . $introduction_text.$readMoreLink.'</div>';
				echo '<div class="blogpost_text" id="blogpost_text_' . $blog_post_id . '" style="display: none">' . $blog_post_text . '</div>';


				$file_name_array=get_blog_attachment($blog_id,$blog_post_id,0);

				if (!empty($file_name_array)) {
					echo '<br /><br />';
					echo Display::return_icon('attachment.gif',get_lang('Attachment'));
					echo '<a href="download.php?file=';
					echo $file_name_array['path'];
					echo ' "> '.$file_name_array['filename'].' </a><br />';
					echo '</span>';
				}
				$username = api_htmlentities(sprintf(get_lang('LoginX'), $blog_post['username']), ENT_QUOTES);
				echo '<span class="blogpost_info">' . get_lang('Author') . ': ' . Display::tag('span', api_get_person_name($blog_post['firstname'], $blog_post['lastname']), array('title'=>$username)) .' - <a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $blog_post['post_id'] . '#add_comment" title="' . get_lang('ReadPost') . '" >' . get_lang('Comments') . ': ' . $blog_post_comments['number_of_comments'] . '</a></span>'."\n";
				echo '</div>';
			}
		} else {
			if($filter == '1=1') {
				echo get_lang('NoArticles');
			} else {
				echo get_lang('NoArticleMatches');
			}
		}
}

	/**
	 * Display the search results
	 *
	 * @param Integer $blog_id
	 * @param String $query_string
	 */
	public static function display_search_results ($blog_id, $query_string) {
		// Init
		$query_string = Database::escape_string($query_string);
		$query_string_parts = explode(' ',$query_string);
		$query_string = array();
		foreach ($query_string_parts as $query_part) {
			$query_string[] = " full_text LIKE '%" . $query_part."%' OR title LIKE '%" . $query_part."%' ";
		}
		$query_string = '('.implode('OR',$query_string) . ')';

		// Display the posts
		echo '<span class="blogpost_title">' . get_lang('SearchResults') . '</span>';
		Blog::display_blog_posts($blog_id, $query_string);
	}

	/**
	 * Display posts from a certain date
	 *
	 * @param Integer $blog_id
	 * @param String $query_string
	 */
	public static function display_day_results ($blog_id, $query_string) {
		// Init
		$date_output = $query_string;
		$date = explode('-',$query_string);
		$query_string = ' DAYOFMONTH(date_creation) =' . intval($date[2]) . ' AND MONTH(date_creation) =' . intval($date[1]) . ' AND YEAR(date_creation) =' . intval($date[0]);

		// Put date in correct output format
		$date_output = api_format_date($date_output, DATE_FORMAT_LONG);

		// Display the posts
		echo '<span class="blogpost_title">' . get_lang('PostsOf') . ': ' . $date_output . '</span>';
		Blog::display_blog_posts($blog_id, $query_string);
	}

	/**
	 * Displays a post and his comments
	 *
	 * @param Integer $blog_id
	 * @param Integer $post_id
	 */
	public static function display_post ($blog_id, $post_id) {
		// Init
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);

		global $charset,$dateFormatLong;

		$course_id = api_get_course_int_id();


		// Get posts and author
		$sql = "SELECT post.*, user.lastname, user.firstname, user.username FROM $tbl_blogs_posts post
					INNER JOIN $tbl_users user ON post.author_id = user.user_id
					WHERE
						post.c_id = $course_id AND
						post.blog_id = '".(int)$blog_id."' AND
						post.post_id = '".(int)$post_id."'
					ORDER BY post_id DESC";
		$result = Database::query($sql);
		$blog_post = Database::fetch_array($result);

		// Get number of comments
		$sql = "SELECT COUNT(1) as number_of_comments FROM $tbl_blogs_comments WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND post_id = '".(int)$post_id."'";
		$result = Database::query($sql);
		$blog_post_comments = Database::fetch_array($result);

		// Prepare data
		$blog_post_text = make_clickable(stripslashes($blog_post['full_text']));
		$blog_post_date = api_convert_and_format_date($blog_post['date_creation'], null, date_default_timezone_get());
		$blog_post_actions = "";

		$task_id = (isset($_GET['task_id']) && is_numeric($_GET['task_id'])) ? intval($_GET['task_id']) : 0;

		if(api_is_allowed('BLOG_' . $blog_id, 'article_edit', $task_id))
			$blog_post_actions .= '<a href="blog.php?action=edit_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $post_id . '&amp;article_id=' . $blog_post['post_id'] . '&amp;task_id=' . $task_id . '" title="' . get_lang('EditThisPost') . '"><img src="../img/edit.gif" /></a>';

		if(api_is_allowed('BLOG_' . $blog_id, 'article_delete', $task_id))
			$blog_post_actions .= '<a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $post_id . '&amp;do=delete_article&amp;article_id=' . $blog_post['post_id'] . '&amp;task_id=' . $task_id . '" title="' . get_lang('DeleteThisArticle') . '" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;"><img src="../img/delete.gif" border="0" /></a>';

		if(api_is_allowed('BLOG_' . $blog_id, 'article_rate'))
			$rating_select = Blog::display_rating_form('post',$blog_id,$post_id);

		$blog_post_text=stripslashes($blog_post_text);

		// Display post
		echo '<div class="blogpost">';
		echo '<span class="blogpost_title"><a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $blog_post['post_id'] . '" title="' . get_lang('ReadPost') . '" >'.stripslashes($blog_post['title']) . '</a></span>';
		echo '<span class="blogpost_date">' . $blog_post_date . '</span>';
		echo '<span class="blogpost_text">' . $blog_post_text . '</span><br />';

		$file_name_array=get_blog_attachment($blog_id,$post_id);

		if (!empty($file_name_array))
		{
			echo ' <br />';
			echo Display::return_icon('attachment.gif',get_lang('Attachment'));
			echo '<a href="download.php?file=';
			echo $file_name_array['path'];
			echo ' "> '.$file_name_array['filename'].' </a>';
			echo '</span>';
			echo '<span class="attachment_comment">';
			echo $file_name_array['comment'];
			echo '</span>';
			echo '<br />';
		}
        $username = api_htmlentities(sprintf(get_lang('LoginX'), $blog_post['username']), ENT_QUOTES);
		echo '<span class="blogpost_info">'.get_lang('Author').': ' .Display::tag('span', api_get_person_name($blog_post['firstname'], $blog_post['lastname']), array('title'=>$username)).' - '.get_lang('Comments').': '.$blog_post_comments['number_of_comments'].' - '.get_lang('Rating').': '.Blog::display_rating('post',$blog_id,$post_id).$rating_select.'</span>';
		echo '<span class="blogpost_actions">' . $blog_post_actions . '</span>';
		echo '</div>';

		// Display comments if there are any
		if($blog_post_comments['number_of_comments'] > 0)
		{
			echo '<div class="comments">';
				echo '<span class="blogpost_title">' . get_lang('Comments') . '</span><br />';
				Blog::get_threaded_comments(0, 0, $blog_id, $post_id, $task_id);
			echo '</div>';
		}

		// Display comment form
		if(api_is_allowed('BLOG_' . $blog_id, 'article_comments_add'))
		{
			Blog::display_new_comment_form($blog_id, $post_id, $blog_post['title']);
		}
	}

	/**
	 * Adds rating to a certain post or comment
	 * @author Toon Keppens
	 *
	 * @param String $type
	 * @param Integer $blog_id
	 * @param Integer $item_id
	 * @param Integer $rating
	 *
	 * @return Boolean success
	 */
	public static function add_rating ($type, $blog_id, $item_id, $rating) {
		global $_user;

		// Init
		$tbl_blogs_rating = Database::get_course_table(TABLE_BLOGS_RATING);
		$course_id = api_get_course_int_id();

		// Check if the user has already rated this post/comment
		$sql = "SELECT rating_id FROM $tbl_blogs_rating
					WHERE c_id = $course_id AND
					blog_id = '".(int)$blog_id."'
					AND item_id = '".(int)$item_id."'
					AND rating_type = '".Database::escape_string($type)."'
					AND user_id = '".(int)$_user['user_id']."'";
		$result = Database::query($sql);

		if(Database::num_rows($result) == 0) // Add rating
		{
			$sql = "INSERT INTO $tbl_blogs_rating (c_id, blog_id, rating_type, item_id, user_id, rating )
					VALUES ($course_id, '".(int)$blog_id."', '".Database::escape_string($type)."', '".(int)$item_id."', '".(int)$_user['user_id']."', '".Database::escape_string($rating)."')";
			$result = Database::query($sql);
			return true;
		}
		else // Return
		{
			return false;
		}
	}

	/**
	 * Shows the rating of user
	 *
	 * @param String $type
	 * @param Integer $blog_id
	 * @param Integer $item_id
	 *
	 * @return array()
	 */
	public static function display_rating ($type, $blog_id, $item_id) {
		$tbl_blogs_rating = Database::get_course_table(TABLE_BLOGS_RATING);
		$course_id = api_get_course_int_id();

		// Calculate rating
		$sql = "SELECT AVG(rating) as rating FROM $tbl_blogs_rating WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."' AND item_id = '".(int)$item_id."' AND rating_type = '".Database::escape_string($type)."' ";
		$result = Database::query($sql);
		$result = Database::fetch_array($result);
		return round($result['rating'], 2);
	}

	/**
	 * Shows the rating form if not already rated by that user
	 * @author Toon Keppens
	 *
	 * @param String $type
	 * @param Integer $blog_id
	 * @param Integer $item_id
	 *
	 *@return String
	 */
	public static function display_rating_form ($type, $blog_id, $post_id, $comment_id = NULL) {
		global $_user;
		$tbl_blogs_rating = Database::get_course_table(TABLE_BLOGS_RATING);
        $course_id = api_get_course_int_id();

		if($type == 'post')
		{
			// Check if the user has already rated this post
			$sql = "SELECT rating_id FROM $tbl_blogs_rating
					WHERE c_id = $course_id AND
					blog_id = '".(int)$blog_id."'
					AND item_id = '".(int)$post_id."'
					AND rating_type = '".Database::escape_string($type)."'
					AND user_id = '".(int)$_user['user_id']."'";
			$result = Database::query($sql);

			if(Database::num_rows($result) == 0) // Add rating
			{
				return ' - ' . get_lang('RateThis') . ': <form method="get" action="blog.php" style="display: inline" id="frm_rating_' . $type . '_' . $post_id . '" name="frm_rating_' . $type . '_' . $post_id . '"><select name="rating" onchange="document.forms[\'frm_rating_' . $type . '_' . $post_id . '\'].submit()"><option value="">-</option><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option></select><input type="hidden" name="action" value="view_post" /><input type="hidden" name="type" value="' . $type . '" /><input type="hidden" name="do" value="rate" /><input type="hidden" name="blog_id" value="' . $blog_id . '" /><input type="hidden" name="post_id" value="' . $post_id . '" /></form>';
			}
			else // Return
			{
				return '';
			}
		}
		if($type = 'comment')
		{
			// Check if the user has already rated this comment
			$sql = "SELECT rating_id FROM $tbl_blogs_rating
					WHERE c_id = $course_id AND blog_id = '".(int)$blog_id ."'
					AND item_id = '".(int)$comment_id."'
					AND rating_type = '".Database::escape_string($type)."'
					AND user_id = '".(int)$_user['user_id']."'";
			$result = Database::query($sql);

			if(Database::num_rows($result) == 0) // Add rating
			{
				return ' - ' . get_lang('RateThis') . ': <form method="get" action="blog.php" style="display: inline" id="frm_rating_' . $type . '_' . $comment_id . '" name="frm_rating_' . $type . '_' . $comment_id . '"><select name="rating" onchange="document.forms[\'frm_rating_' . $type . '_' . $comment_id . '\'].submit()"><option value="">-</option><option value="1">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option></select><input type="hidden" name="action" value="view_post" /><input type="hidden" name="type" value="' . $type . '" /><input type="hidden" name="do" value="rate" /><input type="hidden" name="blog_id" value="' . $blog_id . '" /><input type="hidden" name="post_id" value="' . $post_id . '" /><input type="hidden" name="comment_id" value="' . $comment_id . '" /></form>';
			}
			else // Return
			{
				return '';
			}
		}
	}

	/**
	 * This functions gets all replys to a post, threaded.
	 *
	 * @param Integer $current
	 * @param Integer $current_level
	 * @param Integer $blog_id
	 * @param Integer $post_id
	 */
	public static function get_threaded_comments ($current = 0, $current_level = 0, $blog_id, $post_id, $task_id = 0) {
		// Init
		$tbl_blogs_comments 	= Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$tbl_users 				= Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_tasks 		= Database::get_course_table(TABLE_BLOGS_TASKS);
		global $charset,$dateFormatLong;

		$course_id = api_get_course_int_id();

		// Select top level comments
		$next_level = $current_level + 1;
        $sql = "SELECT comments.*, user.lastname, user.firstname, user.username, task.color
					FROM $tbl_blogs_comments comments
						INNER JOIN $tbl_users user ON comments.author_id = user.user_id
						LEFT JOIN $tbl_blogs_tasks task ON comments.task_id = task.task_id AND task.c_id = $course_id
					WHERE 	comments.c_id = $course_id AND
							parent_comment_id = $current AND
							comments.blog_id = '".(int)$blog_id."' AND
							comments.post_id = '".(int)$post_id."'";
		$result = Database::query($sql);

		while($comment = Database::fetch_array($result)) {
			// Select the children recursivly
			$tmp = "SELECT comments.*, user.lastname, user.firstname, user.username FROM $tbl_blogs_comments comments
					INNER JOIN $tbl_users user ON comments.author_id = user.user_id
					WHERE
						comments.c_id = $course_id AND
						comment_id = $current
						AND blog_id = '".(int)$blog_id."'
						AND post_id = '".(int)$post_id."'";
			$tmp = Database::query($tmp);
			$tmp = Database::fetch_array($tmp);
			$parent_cat = $tmp['parent_comment_id'];
			$border_color = '';

			// Prepare data
			$comment_text = make_clickable(stripslashes($comment['comment']));
			$blog_comment_date = api_convert_and_format_date($comment['date_creation'], null, date_default_timezone_get());
			$blog_comment_actions = "";
			if(api_is_allowed('BLOG_' . $blog_id, 'article_comments_delete', $task_id)) { $blog_comment_actions .= '<a href="blog.php?action=view_post&amp;blog_id=' . $blog_id . '&amp;post_id=' . $post_id . '&amp;do=delete_comment&amp;comment_id=' . $comment['comment_id'] . '&amp;task_id=' . $task_id . '" title="' . get_lang('DeleteThisComment') . '" onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;"><img src="../img/delete.gif" border="0" /></a>'; }
			if(api_is_allowed('BLOG_' . $blog_id, 'article_comments_rate')) { $rating_select = Blog::display_rating_form('comment', $blog_id, $post_id, $comment['comment_id']); }

			if(!is_null($comment['task_id'])) {
				$border_color = ' border-left: 3px solid #' . $comment['color'];
			}

			$comment_text=stripslashes($comment_text);

			// Output...
			$margin = $current_level * 30;
			echo '<div class="blogpost_comment" style="margin-left: ' . $margin . 'px;' . $border_color . '">';
				echo '<span class="blogpost_comment_title"><a href="#add_comment" onclick="document.getElementById(\'comment_parent_id\').value=\'' . $comment['comment_id'] . '\'; document.getElementById(\'comment_title\').value=\'Re: '.addslashes($comment['title']) . '\'" title="' . get_lang('ReplyToThisComment') . '" >'.stripslashes($comment['title']) . '</a></span>';
				echo '<span class="blogpost_comment_date">' . $blog_comment_date . '</span>';
				echo '<span class="blogpost_text">' . $comment_text . '</span>';

				$file_name_array=get_blog_attachment($blog_id,$post_id, $comment['comment_id']);
				if (!empty($file_name_array))
				{
					echo '<br /><br />';
					echo Display::return_icon('attachment.gif',get_lang('Attachment'));
					echo '<a href="download.php?file=';
					echo $file_name_array['path'];
					echo ' "> '.$file_name_array['filename'].' </a>';
					echo '<span class="attachment_comment">';
					echo $file_name_array['comment'];
					echo '</span><br />';
				}
                $username = api_htmlentities(sprintf(get_lang('LoginX'), $comment['username']), ENT_QUOTES);
				echo '<span class="blogpost_comment_info">'.get_lang('Author').': '.Display::tag('span', api_get_person_name($comment['firstname'], $comment['lastname']), array('title'=>$username)).' - '.get_lang('Rating').': '.Blog::display_rating('comment', $blog_id, $comment['comment_id']).$rating_select.'</span>';
				echo '<span class="blogpost_actions">' . $blog_comment_actions . '</span>';
			echo '</div>';

			// Go further down the tree.
			Blog::get_threaded_comments( $comment['comment_id'], $next_level, $blog_id, $post_id);
		}
	}

	/**
	 * Displays the form to create a new post
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_form_new_post ($blog_id) {
		if(api_is_allowed('BLOG_' . $blog_id, 'article_add')) {
			echo '<script type="text/javascript">
					function FCKeditor_OnComplete( editorInstance )
					{
					  editorInstance.Events.AttachEvent( \'OnSelectionChange\', check_for_title ) ;
					}

					function check_for_title()
					{
						// This functions shows that you can interact directly with the editor area
						// DOM. In this way you have the freedom to do anything you want with it.

						// Get the editor instance that we want to interact with.
						var oEditor = FCKeditorAPI.GetInstance(\'post_full_text\') ;

						// Get the Editor Area DOM (Document object).
						var oDOM = oEditor.EditorDocument ;

						var iLength ;
						var contentText ;
						var contentTextArray;
						var bestandsnaamNieuw = "";
						var bestandsnaamOud = "";

						// The are two diffent ways to get the text (without HTML markups).
						// It is browser specific.

						if( document.all )		// If Internet Explorer.
						{
							contentText = oDOM.body.innerText ;
						}
						else					// If Gecko.
						{
							var r = oDOM.createRange() ;
							r.selectNodeContents( oDOM.body ) ;
							contentText = r.toString() ;
						}

						// Compose title if there is none
						contentTextArray = contentText.split(\' \') ;
						var x=0;
						for(x=0; (x<5 && x<contentTextArray.length); x++)
						{
							if(x < 4)
							{
								bestandsnaamNieuw += contentTextArray[x] + \' \';
							}
							else
							{
								bestandsnaamNieuw += contentTextArray[x] + \'...\';
							}
						}

						if(document.getElementById(\'post_title_edited\').value == "false")
						{
							document.getElementById(\'post_title\').value = bestandsnaamNieuw;
						}
					}

					function trim(s) {
					 while(s.substring(0,1) == \' \') {
					  s = s.substring(1,s.length);
					 }
					 while(s.substring(s.length-1,s.length) == \' \') {
					  s = s.substring(0,s.length-1);
					 }
					 return s;
					}

					function check_if_still_empty()
					{
						if(trim(document.getElementById(\'post_title\').value) != "")
						{
							document.getElementById(\'post_title_edited\').value = "true";
						}
					}

			</script>';


			echo '<form name="add_post" enctype="multipart/form-data"  method="post" action="blog.php?action=new_post&blog_id=' . $blog_id . '">';

			echo '<input type="hidden" name="post_title_edited" id="post_title_edited" value="false" />';

			// form title
			echo '<legend>' . get_lang('NewPost') . '</legend>';

			// article title
			echo '<div><span class="form_required">*</span>'.get_lang('Title') . ': <input name="post_title" id="post_title" type="text" size="60" onblur="check_if_still_empty()" /></div><br />';

			// article text
			$oFCKeditor = new FCKeditor('post_full_text') ;
			$oFCKeditor->Width		= '100%';
			$oFCKeditor->Height		= '200';
			if(!api_is_allowed_to_edit()) {
				$oFCKeditor->ToolbarSet = 'ProjectStudent';
			} else {
				$oFCKeditor->ToolbarSet = 'Project';
			}
			$oFCKeditor->Value = isset($_POST['post_full_text'])?stripslashes($_POST['post_full_text']):'';

			echo '<div class="control-group">';
			$oFCKeditor->Create();
			echo '</div>';

			// attachment
			echo '<div class="control-group">
						<label class="control-label">
							' . get_lang('AddAnAttachment') . '
						</label>
						<div class="controls">
							<input type="file" name="user_upload"/>
						</div>
					</div>';

			// comment
			echo '<div class="control-group">
						<label class="control-label">
							' . get_lang('FileComment') . '
						</label>
						<div class="controls">
							<textarea name="post_file_comment" cols="34" /></textarea>
						</div>
					</div>';

			// submit
			echo '<div class="control-group">						
						<div class="controls">
								 <input type="hidden" name="action" value="" />
								 <input type="hidden" name="new_post_submit" value="true" />
								 <button class="save" type="submit" name="Submit">' . get_lang('Save') . '</button>
						</div>
					</div>';
			echo '</form>';
		} else {
			api_not_allowed();
		}
	}

	/**
	 * Displays the form to edit a post
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_form_edit_post ($blog_id, $post_id) {
		// Init
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);

		$course_id = api_get_course_int_id();

		// Get posts and author
		$sql = "SELECT post.*, user.lastname, user.firstname FROM $tbl_blogs_posts post
				INNER JOIN $tbl_users user ON post.author_id = user.user_id
				WHERE
				post.c_id 			= $course_id AND
				post.blog_id 		= '".(int)$blog_id ."'
				AND post.post_id	= '".(int)$post_id."'
				ORDER BY post_id DESC";
		$result = Database::query($sql);
		$blog_post = Database::fetch_array($result);

		// Prepare data
		$blog_post_text = stripslashes($blog_post['full_text']);

		echo '<form name="edit_post" method="post" action="blog.php?action=edit_post&post_id=' . Security::remove_XSS($_GET['post_id']) . '&blog_id=' . Security::remove_XSS($blog_id) . '&article_id='.Security::remove_XSS($_GET['article_id']).'&task_id='.Security::remove_XSS($_GET['task_id']).'">';

		// form title
		echo '<legend>' . get_lang('EditPost') . '</legend>';

		// article title
		echo '<div><span class="form_required">*</span>' . get_lang('Title') . ': <input name="post_title" id="post_title" type="text" size="60" value="'.stripslashes($blog_post['title']) . '" /><br /></div>';

		// article text
		$oFCKeditor = new FCKeditor('post_full_text') ;

		$oFCKeditor->Width		= '100%';
		$oFCKeditor->Height		= '200';

		if(!api_is_allowed_to_edit()) {
			$oFCKeditor->ToolbarSet = 'ProjectStudent';
		} else {
			$oFCKeditor->ToolbarSet = 'Project';
		}
		$oFCKeditor->Value		= isset($_POST['post_full_text'])?stripslashes($_POST['post_full_text']):$blog_post_text;
		echo '<div class="controls">';
		echo $oFCKeditor->Create();
		echo '</div>';

		// submit
		echo '	<div class="control-group">
					
					<div class="controls">
							 <input type="hidden" name="action" value="" />
							 <input type="hidden" name="edit_post_submit" value="true" />
							 <input type="hidden" name="post_id" value="' . (int)$_GET['post_id'] . '" />
							 <button class="save" type="submit" name="Submit">' . get_lang('Save') . '</button>
					</div>
				</div>';


		echo '</form>';
	}

	/**
	 * Displays a list of tasks in this blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_task_list ($blog_id) {
		global $charset;
        $course_id = api_get_course_int_id();

		if(api_is_allowed('BLOG_' . $blog_id, 'article_add')) {
			// Init
			$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
			$counter = 0;
			global $color2;

			echo '<div class="actions">';
			echo '<a href="' .api_get_self(). '?action=manage_tasks&amp;blog_id=' . $blog_id . '&amp;do=add"><img src="../img/blog_newtasks.gif" border="0" align="middle" alt="'.get_lang('AddTasks').'" />' . get_lang('AddTasks') . '</a> ';
			echo '<a href="' .api_get_self(). '?action=manage_tasks&amp;blog_id=' . $blog_id . '&amp;do=assign"><img src="../img/blog_task.gif" border="0" align="middle" alt="'.get_lang('AssignTasks').'" />' . get_lang('AssignTasks') . '</a>';
			?>
				<a href="<?php echo api_get_self(); ?>?action=manage_rights&amp;blog_id=<?php echo $blog_id ?>" title="<?php echo get_lang('ManageRights') ?>"><?php echo Display::return_icon('blog_admin_users.png', get_lang('RightsManager'),'',ICON_SIZE_SMALL). get_lang('RightsManager') ?></a>
			<?php
			echo '</div>';

			echo '<span class="blogpost_title">' . get_lang('TaskList') . '</span><br />';
			echo "<table class=\"data_table\">";
			echo	"<tr bgcolor=\"$color2\" align=\"center\" valign=\"top\">",
					 "<th width='240'><b>",get_lang('Title'),"</b></th>\n",
					 "<th><b>",get_lang('Description'),"</b></th>\n",
					 "<th><b>",get_lang('Color'),"</b></th>\n",
					 "<th width='50'><b>",get_lang('Modify'),"</b></th>\n",
				"</tr>\n";


			$sql = " SELECT
					blog_id,
					task_id,
					blog_id,
					title,
					description,
					color,
					system_task
				FROM " . $tbl_blogs_tasks . "
				WHERE c_id = $course_id AND blog_id = " . (int)$blog_id . "
				ORDER BY system_task, title";
			$result = Database::query($sql);


			while($task = Database::fetch_array($result))
			{
				$counter++;
				$css_class = (($counter % 2) == 0) ? "row_odd" : "row_even";
				$delete_icon = ($task['system_task'] == '1') ? "delete_na.gif" : "delete.gif";
				$delete_title = ($task['system_task'] == '1') ? get_lang('DeleteSystemTask') : get_lang('DeleteTask');
				$delete_link = ($task['system_task'] == '1') ? '#' : api_get_self() . '?action=manage_tasks&amp;blog_id=' . $task['blog_id'] . '&amp;do=delete&amp;task_id=' . $task['task_id'];
				$delete_confirm = ($task['system_task'] == '1') ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;"';

				echo	'<tr class="' . $css_class . '" valign="top">',
							 '<td width="240">' . Security::remove_XSS($task['title']) . '</td>',
							 '<td>' . Security::remove_XSS($task['description']) . '</td>',
							 '<td><span style="background-color: #' . $task['color'] . '">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></td>',
							 '<td width="50">',
							 	'<a href="' .api_get_self(). '?action=manage_tasks&amp;blog_id=' . $task['blog_id'] . '&amp;do=edit&amp;task_id=' . $task['task_id'] . '">',
								'<img src="../img/edit.gif" border="0" title="' . get_lang('EditTask') . '" />',
								"</a>\n",
								'<a href="' . $delete_link . '"',
								$delete_confirm,
								'><img src="../img/' . $delete_icon . '" border="0" title="' . $delete_title . '" />',
								"</a>\n",
							 '</td>',
						'</tr>';
			}
			echo "</table>";
		}
	}

	/**
	 * Displays a list of tasks assigned to a user in this blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_assigned_task_list ($blog_id) {
		// Init
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_blogs_tasks_rel_user = Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);
		$counter = 0;
		global $charset,$color2;

		echo '<span class="blogpost_title">' . get_lang('AssignedTasks') . '</span><br />';
		echo "<table class=\"data_table\">";
		echo	"<tr bgcolor=\"$color2\" align=\"center\" valign=\"top\">",
				 "<th width='240'><b>",get_lang('Member'),"</b></th>\n",
				 "<th><b>",get_lang('Task'),"</b></th>\n",
				 "<th><b>",get_lang('Description'),"</b></th>\n",
				 "<th><b>",get_lang('TargetDate'),"</b></th>\n",
				 "<th width='50'><b>",get_lang('Modify'),"</b></th>\n",
			"</tr>";

		$course_id = api_get_course_int_id();

		$sql = "SELECT task_rel_user.*, task.title, user.firstname, user.lastname, user.username, task.description, task.system_task, task.blog_id, task.task_id
				FROM $tbl_blogs_tasks_rel_user task_rel_user
				INNER JOIN $tbl_blogs_tasks task ON task_rel_user.task_id = task.task_id
				INNER JOIN $tbl_users user ON task_rel_user.user_id = user.user_id
				WHERE task_rel_user.c_id = $course_id AND
						task.c_id = $course_id AND
						task_rel_user.blog_id = '".(int)$blog_id."'
				ORDER BY target_date ASC";
		$result = Database::query($sql);

		while($assignment = Database::fetch_array($result)) {
			$counter++;
			$css_class = (($counter % 2)==0) ? "row_odd" : "row_even";
			$delete_icon = ($assignment['system_task'] == '1') ? "delete_na.gif" : "delete.gif";
			$delete_title = ($assignment['system_task'] == '1') ? get_lang('DeleteSystemTask') : get_lang('DeleteTask');
			$delete_link = ($assignment['system_task'] == '1') ? '#' : api_get_self() . '?action=manage_tasks&amp;blog_id=' . $assignment['blog_id'] . '&amp;do=delete&amp;task_id=' . $assignment['task_id'];
			$delete_confirm = ($assignment['system_task'] == '1') ? '' : 'onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;"';

            $username = api_htmlentities(sprintf(get_lang('LoginX'), $assignment['username']), ENT_QUOTES);

			echo	'<tr class="' . $css_class . '" valign="top">',
						 '<td width="240">' . Display::tag('span', api_get_person_name($assignment['firstname'], $assignment['lastname']), array('title'=>$username)) . '</td>',
						 '<td>'.stripslashes($assignment['title']) . '</td>',
						 '<td>'.stripslashes($assignment['description']) . '</td>',
						 '<td>' . $assignment['target_date'] . '</td>',
						 '<td width="50">',
						 	'<a href="' .api_get_self(). '?action=manage_tasks&amp;blog_id=' . $assignment['blog_id'] . '&amp;do=edit_assignment&amp;task_id=' . $assignment['task_id'] . '&amp;user_id=' . $assignment['user_id'] . '">',
							'<img src="../img/edit.gif" border="0" title="' . get_lang('EditTask') . '" />',
							"</a>\n",
							'<a href="' .api_get_self(). '?action=manage_tasks&amp;blog_id=' . $assignment['blog_id'] . '&amp;do=delete_assignment&amp;task_id=' . $assignment['task_id'] . '&amp;user_id=' . $assignment['user_id'] . '" ',
							'onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;"',
							'<img src="../img/' . $delete_icon . '" border="0" title="' . $delete_title . '" />',
							"</a>\n",
						 '</td>',
					'</tr>';
		}
		echo "</table>";
	}

	/**
	 * Displays new task form
	 * @author Toon Keppens
	 *
	 */
	public static function display_new_task_form ($blog_id) {
		// Init
		$colors = array('FFFFFF','FFFF99','FFCC99','FF9933','FF6699','CCFF99','CC9966','66FF00', '9966FF', 'CF3F3F', '990033','669933','0033FF','003366','000000');

		// form
		echo '<form name="add_task" method="post" action="blog.php?action=manage_tasks&amp;blog_id=' . $blog_id . '">';

		// form title
		echo '<legend>'.get_lang('AddTask').'</legend>';

		// task title
		echo '	<div class="control-group">
					<label class="control-label">
						<span class="form_required">*</span>' . get_lang('Title') . '
					</label>
					<div class="controls">
						<input name="task_name" type="text" size="70" />
					</div>
				</div>';

		// task comment
		echo '	<div class="control-group">
					<label class="control-label">
						' . get_lang('Description') . '
					</label>
					<div class="controls">
						<textarea name="task_description" cols="45"></textarea>
					</div>
				</div>';

		// task management
		echo '	<div class="control-group">
					<label class="control-label">
						' . get_lang('TaskManager') . '
					</label>
					<div class="controls">';
								echo "\t\t\t" . '<table class="data_table" cellspacing="0" style="border-collapse:collapse; width:446px;">';
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<th colspan="2" style="width:223px;">' . get_lang('ArticleManager') . '</th>' . "\n";
										echo "\t\t\t\t\t" . '<th width:223px;>' . get_lang('CommentManager') . '</th>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:111px;"><label for="articleDelete">' . get_lang('Delete') . '</label></th>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:112px;"><label for="articleEdit">' . get_lang('Edit') . '</label></th>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:223px;"><label for="commentsDelete">' . get_lang('Delete') . '</label></th>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<td style="text-align:center;"><input id="articleDelete" name="chkArticleDelete" type="checkbox" /></td>' . "\n";
										echo "\t\t\t\t\t" . '<td style="text-align:center;"><input id="articleEdit" name="chkArticleEdit" type="checkbox" /></td>' . "\n";
										echo "\t\t\t\t\t" . '<td style="border:1px dotted #808080; text-align:center;"><input id="commentsDelete" name="chkCommentsDelete" type="checkbox" /></td>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
								echo "\t\t\t" . '</table>' . "\n";
		echo '		</div>
				</div>';


		// task color
		echo '	<div class="control-group">
					<label class="control-label">
						' . get_lang('Color') . '
					</label>
					<div class="controls">';
		echo '		   	<select name="task_color" id="color" style="width: 150px; background-color: #eeeeee" onchange="document.getElementById(\'color\').style.backgroundColor=\'#\'+document.getElementById(\'color\').value" onkeypress="document.getElementById(\'color\').style.backgroundColor=\'#\'+document.getElementById(\'color\').value">';
								foreach ($colors as $color)
								{
									$style = 'style="background-color: #' . $color . '"';
									echo '<option value="' . $color . '" ' . $style . '>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</option>';
								}
		echo '			   </select>';
		echo '		</div>
				</div>';

		// submit
		echo '	<div class="control-group">					
					<div class="controls">
							<input type="hidden" name="action" value="" />
							<input type="hidden" name="new_task_submit" value="true" />
						<button class="save" type="submit" name="Submit">' . get_lang('Save') . '</button>
					</div>
				</div>';

		echo '</form>';

		echo '<div style="clear:both; margin-bottom: 10px;"></div>';
	}


	/**
	 * Displays edit task form
	 * @author Toon Keppens
	 *
	 */
	public static function display_edit_task_form ($blog_id, $task_id) {
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
        $course_id = api_get_course_int_id();

		$colors = array('FFFFFF','FFFF99','FFCC99','FF9933','FF6699','CCFF99','CC9966','66FF00', '9966FF', 'CF3F3F', '990033','669933','0033FF','003366','000000');

		$sql = "SELECT blog_id, task_id, title, description, color FROM $tbl_blogs_tasks WHERE c_id = $course_id AND task_id = '".(int)$task_id."'";
		$result = Database::query($sql);
		$task = Database::fetch_array($result);

		// Display
		echo '<form name="edit_task" method="post" action="blog.php?action=manage_tasks&amp;blog_id=' . $blog_id . '">
					<legend>' . get_lang('EditTask') . '</legend>
					<table width="100%" border="0" cellspacing="2">
						<tr>
					   <td align="right">' . get_lang('Title') . ':&nbsp;&nbsp;</td>
					   <td><input name="task_name" type="text" size="70" value="'.Security::remove_XSS($task['title']) . '" /></td>
						</tr>
						<tr>
					   <td align="right">' . get_lang('Description') . ':&nbsp;&nbsp;</td>
					   <td><textarea name="task_description" cols="45">'.Security::remove_XSS($task['description']).'</textarea></td>
						</tr>';

						/* edit by Kevin Van Den Haute (kevin@develop-it.be) */
						$tbl_tasks_permissions = Database::get_course_table(TABLE_BLOGS_TASKS_PERMISSIONS);

						$sql = " SELECT id, action FROM " . $tbl_tasks_permissions . "
							     WHERE c_id = $course_id AND task_id = '" . (int)$task_id."'";
						$result = Database::query($sql);

						$arrPermissions = array();

						while ($row = Database::fetch_array($result))
							$arrPermissions[] = $row['action'];

						echo "\t" . '<tr>' . "\n";
							echo "\t\t" . '<td style="text-align:right; vertical-align:top;">' . get_lang('TaskManager') . ':&nbsp;&nbsp;</td>' . "\n";
							echo "\t\t" . '<td>' . "\n";
								echo "\t\t\t" . '<table  class="data_table" cellspacing="0" style="border-collapse:collapse; width:446px;">';
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<th colspan="2" style="width:223px;">' . get_lang('ArticleManager') . '</th>' . "\n";
										echo "\t\t\t\t\t" . '<th width:223px;>' . get_lang('CommentManager') . '</th>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:111px;"><label for="articleDelete">' . get_lang('Delete') . '</label></th>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:112px;"><label for="articleEdit">' . get_lang('Edit') . '</label></th>' . "\n";
										echo "\t\t\t\t\t" . '<th style="width:223px;"><label for="commentsDelete">' . get_lang('Delete') . '</label></th>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
									echo "\t\t\t\t" . '<tr>' . "\n";
										echo "\t\t\t\t\t" . '<td style="text-align:center;"><input ' . ((in_array('article_delete', $arrPermissions)) ? 'checked ' : '') . 'id="articleDelete" name="chkArticleDelete" type="checkbox" /></td>' . "\n";
										echo "\t\t\t\t\t" . '<td style="text-align:center;"><input ' . ((in_array('article_edit', $arrPermissions)) ? 'checked ' : '') . 'id="articleEdit" name="chkArticleEdit" type="checkbox" /></td>' . "\n";
										echo "\t\t\t\t\t" . '<td style="text-align:center;"><input ' . ((in_array('article_comments_delete', $arrPermissions)) ? 'checked ' : '') . 'id="commentsDelete" name="chkCommentsDelete" type="checkbox" /></td>' . "\n";
									echo "\t\t\t\t" . '</tr>' . "\n";
								echo "\t\t\t" . '</table>' . "\n";
							echo "\t\t" . '</td>' . "\n";
						echo "\t" . '</tr>' . "\n";
						/* end of edit */

						echo '<tr>
					   <td align="right">' . get_lang('Color') . ':&nbsp;&nbsp;</td>
					   <td>
					   	<select name="task_color" id="color" style="width: 150px; background-color: #' . $task['color'] . '" onchange="document.getElementById(\'color\').style.backgroundColor=\'#\'+document.getElementById(\'color\').value" onkeypress="document.getElementById(\'color\').style.backgroundColor=\'#\'+document.getElementById(\'color\').value">';
								foreach ($colors as $color)
								{
									$selected = ($color == $task['color']) ? ' selected' : '';
									$style = 'style="background-color: #' . $color . '"';
									echo '<option value="' . $color . '" ' . $style . ' ' . $selected . ' >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</option>';
								}
		echo '			   </select>
						  </td>
						</tr>
						<tr>
							<td align="right">&nbsp;</td>
							<td><br /><input type="hidden" name="action" value="" />
							<input type="hidden" name="edit_task_submit" value="true" />
							<input type="hidden" name="task_id" value="' . $task['task_id'] . '" />
							<input type="hidden" name="blog_id" value="' . $task['blog_id'] . '" />
							<button class="save" type="submit" name="Submit">' . get_lang('Save') . '</button></td>
						</tr>
					</table>
				</form>';
	}

	/**
	 * Displays assign task form
	 * @author Toon Keppens
	 *
	 */
	public static function display_assign_task_form ($blog_id) {
		// Init
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user = Database::get_course_table(TABLE_BLOGS_REL_USER);
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
		$day	= date("d");
		$month	= date("m");
		$year	= date("Y");
		global $MonthsLong;

		$course_id = api_get_course_int_id();

		// Get users in this blog / make select list of it
		$sql = "SELECT user.user_id, user.firstname, user.lastname, user.username FROM $tbl_users user
				INNER JOIN $tbl_blogs_rel_user blogs_rel_user
				ON user.user_id = blogs_rel_user.user_id
				WHERE blogs_rel_user.c_id = $course_id AND blogs_rel_user.blog_id = '".(int)$blog_id."'";
		$result = Database::query($sql);
		$select_user_list = '<select name="task_user_id">';

		while($user = Database::fetch_array($result))
		{
            $username = api_htmlentities(sprintf(get_lang('LoginX'), $user['username']), ENT_QUOTES);
			$select_user_list .= '<option title="'.$username.'" value="' . $user['user_id'] . '">' . api_get_person_name($user['firstname'], $user['lastname']).'</option>';
		}
		$select_user_list .= '</select>';


		// Get tasks in this blog / make select list of it
		$sql = "
			SELECT
				blog_id,
				task_id,
				blog_id,
				title,
				description,
				color,
				system_task
			FROM " . $tbl_blogs_tasks . "
			WHERE c_id = $course_id AND blog_id = " . (int)$blog_id . "
			ORDER BY system_task, title";
		$result = Database::query($sql);
		$select_task_list = '<select name="task_task_id">';

		while($task = Database::fetch_array($result))
		{
			$select_task_list .= '<option value="' . $task['task_id'] . '">'.stripslashes($task['title']) . '</option>';
		}
		$select_task_list .= '</select>';

		// form
		echo '<form name="assign_task" method="post" action="blog.php?action=manage_tasks&amp;blog_id=' . $blog_id . '">';

		// form title
		echo '<legend>'.get_lang('AssignTask').'</legend>';

		// user
		echo '	<div class="control-group">
					<label class="control-label">
						<span class="form_required">*</span>' . get_lang('SelectUser') . '
					</label>
					<div class="controls">
						'.$select_user_list.'
					</div>
				</div>';

		// task
		echo '	<div class="control-group">
					<label class="control-label">
						<span class="form_required">*</span>' . get_lang('SelectTask') . '
					</label>
					<div class="controls">
						'.$select_task_list.'
					</div>
				</div>';

		// date
		echo '	<div class="control-group">
					<label class="control-label">
						<span class="form_required">*</span>' . get_lang('SelectTargetDate') . '
					</label>
					<div class="controls">';
		echo '			    <select name="task_day">';
								for($i=1; $i<=31; $i++)
								{
									// values need to have double digits
									$value = ($i <= 9 ? "0" . $i : $i);

									// the current day is indicated with [] around the date
									if($value==$day)
									{ echo "\t\t\t\t <option value=\"" . $value."\" selected> " . $i." </option>\n";}
									else
									{ echo "\t\t\t\t <option value=\"" . $value."\">" . $i."</option>\n"; }
								}
							echo '</select>

							<select name="task_month">';
								for($i=1; $i<=12; $i++)
								{
									// values need to have double digits
									$value = ($i <= 9 ? "0" . $i : $i);

									if($value==$month)
									{ echo "\t\t\t\t <option value=\"" . $value."\" selected>" . $MonthsLong[$i-1]."</option>\n"; }
									else
									{ echo "\t\t\t\t <option value=\"" . $value."\">" . $MonthsLong[$i-1]."</option>\n"; }
								}
							echo '</select>

							<select name="task_year">
								<option value="'.($year-1) . '">'.($year-1) . '</option>
								<option value="' . $year . '" selected> ' . $year . ' </option>';
								for($i=1; $i<=5; $i++)
								{
									$value=$year+$i;
									echo "\t\t\t\t<option value=\"" . $value."\">" . $value."</option>\n";
								}
							echo '</select>
							<a title="Kalender" href="javascript:openCalendar(\'assign_task\', \'task_\')"><img src="../img/calendar_select.gif" border="0" align="absmiddle"/></a>';
		echo '		</div>
				</div>';

		// submit
		echo '	<div class="control-group">
					<label class="control-label">
					</div>
					<div class="controls">
							<input type="hidden" name="action" value="" />
							<input type="hidden" name="assign_task_submit" value="true" />
						<button class="save" type="submit" name="Submit">' . get_lang('Ok') . '</button>
					</div>
				</div>';



		echo '</form>';
		echo '<div style="clear: both; margin-bottom:10px;"></div>';
	}

		/**
	 * Displays assign task form
	 * @author Toon Keppens
	 *
	 */
	public static function display_edit_assigned_task_form ($blog_id, $task_id, $user_id) {
		$tbl_users 					= Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user 		= Database::get_course_table(TABLE_BLOGS_REL_USER);
		$tbl_blogs_tasks 			= Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_blogs_tasks_rel_user 	= Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);

		$course_id = api_get_course_int_id();

		$year	= date("Y");
		global $MonthsLong;

		// Get assignd date;
		$sql = "
			SELECT target_date
			FROM $tbl_blogs_tasks_rel_user
			WHERE c_id = $course_id AND
			      blog_id = '".(int)$blog_id."' AND
			      user_id = '".(int)$user_id."' AND
			      task_id = '".(int)$task_id."'";
		$result = Database::query($sql);
		$row = Database::fetch_assoc($result);

		$old_date = $row['target_date'];
		$date = explode('-', $row['target_date']);

		// Get users in this blog / make select list of it
		$sql = "
			SELECT user.user_id, user.firstname, user.lastname, user.username
			FROM $tbl_users user
			INNER JOIN $tbl_blogs_rel_user blogs_rel_user ON user.user_id = blogs_rel_user.user_id
			WHERE blogs_rel_user.c_id = $course_id AND blogs_rel_user.blog_id = '".(int)$blog_id."'";
		$result = Database::query($sql);

		$select_user_list = '<select name="task_user_id">';
		while($user = Database::fetch_array($result)) {
            $username = api_htmlentities(sprintf(get_lang('LoginX'), $user['username']), ENT_QUOTES);
			$select_user_list .= '<option title="'.$username.'"' . (($user_id == $user['user_id']) ? 'selected="selected "' : ' ') . 'value="' . $user['user_id'] . '">' . api_get_person_name($user['firstname'], $user['lastname']) . '</option>';
		}

		$select_user_list .= '</select>';

		// Get tasks in this blog / make select list of it
		$sql = "
			SELECT
				blog_id,
				task_id,
				title,
				description,
				color,
				system_task
			FROM " . $tbl_blogs_tasks . "
			WHERE c_id = $course_id AND blog_id = " . (int)$blog_id . "
			ORDER BY system_task, title";
		$result = Database::query($sql);

		$select_task_list = '<select name="task_task_id">';

		while($task = Database::fetch_array($result)) {
			//if(!in_array($task['task_id'], $arrUserTasks) || $task_id == $task['task_id'])
				$select_task_list .= '<option ' . (($task_id == $task['task_id']) ? 'selected="selected "' : ' ') . 'value="' . $task['task_id'] . '">'.stripslashes($task['title']) . '</option>';
		}

		$select_task_list .= '</select>';

		// Display
		echo '<form name="assign_task" method="post" action="blog.php?action=manage_tasks&amp;blog_id=' . $blog_id . '">
				<table width="100%" border="0" cellspacing="2" cellpadding="0" style="background-color: #f6f6f6; border: 1px solid #dddddd">
				  <tr>
				  	<td width="200"></td>
				  	<td><b>' . get_lang('AssignTask') . '</b><br /><br /></td>
				  </tr>
					<tr>
				   <td align="right">' . get_lang('SelectUser') . ':&nbsp;&nbsp;</td>
				   <td>' . $select_user_list . '</td>
					</tr>
					<tr>
				   <td align="right">' . get_lang('SelectTask') . ':&nbsp;&nbsp;</td>
				   <td>' . $select_task_list . '</td>
					</tr>
					<tr>
				   <td align="right">' . get_lang('SelectTargetDate') . ':&nbsp;&nbsp;</td>
				   <td>
				    <select name="task_day">';

							for($i=1; $i<=31; $i++)
							{
								// values need to have double digits
								$value = ($i <= 9 ? "0" . $i : $i);

								echo "\t\t\t\t<option " . (($date[2] == $value) ? 'selected="selected "' : ' ') . "value=\"" . $value . "\">" . $i . "</option>\n";
							}

						echo '</select>

						<select name="task_month">';

							for($i=1; $i<=12; $i++)
							{
								// values need to have double digits
								$value = ($i <= 9 ? "0" . $i : $i);

								echo "\t\t\t\t<option " . (($date[1] == $value) ? 'selected="selected "' : ' ') . "value=\"" . $value . "\">" . $MonthsLong[$i-1]."</option>\n";
							}

						echo '</select>

						<select name="task_year">
							<option value="' . ($year - 1) . '">' . ($year - 1) . '</option>
							<option value="' . $year . '" selected> ' . $year . ' </option>';

							for($i=1; $i<=5; $i++)
							{
								$value = $year + $i;

								echo "\t\t\t\t<option " . (($date[0] == $value) ? 'selected="selected "' : ' ') . "value=\"" . $value . "\">" . $value . "</option>\n";
							}

						echo '</select>
						<a title="Kalender" href="javascript:openCalendar(\'assign_task\', \'task_\')"><img src="../img/calendar_select.gif" border="0" align="absmiddle"/></a>
					 </td>
					</tr>
					<tr>
						<td align="right">&nbsp;</td>
						<input type="hidden" name="action" value="" />
						<input type="hidden" name="old_task_id" value="' . $task_id . '" />
						<input type="hidden" name="old_user_id" value="' . $user_id . '" />
						<input type="hidden" name="old_target_date" value="' . $old_date . '" />
						<input type="hidden" name="assign_task_edit_submit" value="true" />
						<td><br /><button class="save type="submit" name="Submit">' . get_lang('Ok') . '</button></td>
					</tr>
				</table>
			</form>';
	}

	/**
	 * Assigns a task to a user in a blog
	 *
	 * @param Integer $blog_id
	 * @param Integer $user_id
	 * @param Integer $task_id
	 * @param Date $target_date
	 */
	public static function assign_task ($blog_id, $user_id, $task_id, $target_date) {
		// Init
		$tbl_blogs_tasks_rel_user = Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);
		$course_id = api_get_course_int_id();

		$sql = "
			SELECT COUNT(*) as 'number'
			FROM " . $tbl_blogs_tasks_rel_user . "
			WHERE c_id = $course_id AND
			blog_id = " . (int)$blog_id . "
			AND	user_id = " . (int)$user_id . "
			AND	task_id = " . (int)$task_id . "
		";

		$result = @Database::query($sql);
		$row = Database::fetch_assoc($result);

		if($row['number'] == 0) {
			$sql = "
				INSERT INTO " . $tbl_blogs_tasks_rel_user . " (
					c_id,
					blog_id,
					user_id,
					task_id,
					target_date
				) VALUES (
					'" . (int)$course_id . "',
					'" . (int)$blog_id . "',
					'" . (int)$user_id . "',
					'" . (int)$task_id . "',
					'" . Database::escape_string($target_date) . "'
				)";

			$result = @Database::query($sql);
		}
	}

	public static function edit_assigned_task ($blog_id, $user_id, $task_id, $target_date, $old_user_id, $old_task_id, $old_target_date) {
		// Init
		$tbl_blogs_tasks_rel_user = Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);

		$course_id = api_get_course_int_id();

		$sql = "SELECT COUNT(*) as 'number'
			FROM " . $tbl_blogs_tasks_rel_user . "
			WHERE
			    c_id = $course_id AND
				blog_id = " . (int)$blog_id . " AND
				user_id = " . (int)$user_id . " AND
				task_id = " . (int)$task_id . "
		";

		$result = @Database::query($sql);
		$row = Database::fetch_assoc($result);

		if($row['number'] == 0 || ($row['number'] != 0 && $task_id == $old_task_id && $user_id == $old_user_id)) {
			$sql = "
				UPDATE " . $tbl_blogs_tasks_rel_user . "
				SET
					user_id = " . (int)$user_id . ",
					task_id = " . (int)$task_id . ",
					target_date = '" . Database::escape_string($target_date) . "'
				WHERE
					c_id = $course_id AND
					blog_id = " . (int)$blog_id . " AND
					user_id = " . (int)$old_user_id . " AND
					task_id = " . (int)$old_task_id . " AND
					target_date = '" . Database::escape_string($old_target_date) . "'
			";

			$result = @Database::query($sql);
		}
	}

	/**
	 * Displays a list with posts a user can select to execute his task.
	 *
	 * @param Integer $blog_id
	 * @param unknown_type $task_id
	 */
	public static function display_select_task_post ($blog_id, $task_id) {
		// Init
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		$course_id = api_get_course_int_id();


		$sql = "SELECT title, description FROM $tbl_blogs_tasks
				WHERE task_id = '".(int)$task_id."'
				AND c_id = $course_id";
		$result = Database::query($sql);
		$row = Database::fetch_assoc($result);
		// Get posts and authors
		$sql = "SELECT post.*, user.lastname, user.firstname, user.username
				FROM $tbl_blogs_posts post
				INNER JOIN $tbl_users user ON post.author_id = user.user_id
				WHERE post.blog_id = '".(int)$blog_id."' AND post.c_id = $course_id
				ORDER BY post_id DESC
				LIMIT 0, 100";
		$result = Database::query($sql);

		// Display
		echo '<span class="blogpost_title">' . get_lang('SelectTaskArticle') . ' "' . stripslashes($row['title']) . '"</span>';
		echo '<span style="font-style: italic;"">'.stripslashes($row['description']) . '</span><br><br>';

		if(Database::num_rows($result) > 0) {
			while($blog_post = Database::fetch_array($result)) {
			    $username = api_htmlentities(sprintf(get_lang('LoginX'), $blog_post['username']), ENT_QUOTES);
				echo '<a href="blog.php?action=execute_task&amp;blog_id=' . $blog_id . '&amp;task_id=' . $task_id . '&amp;post_id=' . $blog_post['post_id'] . '#add_comment">'.stripslashes($blog_post['title']) . '</a>, ' . get_lang('WrittenBy') . ' ' . stripslashes(Display::tag('span', api_get_person_name($blog_post['firstname'], $blog_post['lastname']), array('title'=>$username))) . '<br />';
			}
		} else
			echo get_lang('NoArticles');
	}

	/**
	 * Subscribes a user to a given blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 * @param Integer $user_id
	 */
	public static function set_user_subscribed ($blog_id,$user_id) {
		// Init
		$tbl_blogs_rel_user 	= Database::get_course_table(TABLE_BLOGS_REL_USER);
		$tbl_user_permissions 	= Database::get_course_table(TABLE_PERMISSION_USER);

		$course_id = api_get_course_int_id();

		// Subscribe the user
		$sql = "INSERT INTO $tbl_blogs_rel_user (c_id, blog_id, user_id ) VALUES ($course_id, '".(int)$blog_id."', '".(int)$user_id."');";
		$result = Database::query($sql);

		// Give this user basic rights
		$sql="INSERT INTO $tbl_user_permissions (c_id, user_id,tool,action) VALUES ($course_id, '".(int)$user_id."','BLOG_" . (int)$blog_id."','article_add')";
		$result = Database::query($sql);
		$sql="INSERT INTO $tbl_user_permissions (c_id, user_id,tool,action) VALUES ($course_id, '".(int)$user_id."','BLOG_" . (int)$blog_id."','article_comments_add')";
		$result = Database::query($sql);
	}

	/**
	 * Unsubscribe a user from a given blog
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 * @param Integer $user_id
	 */
	public static function set_user_unsubscribed ($blog_id, $user_id) {
		// Init
		$tbl_blogs_rel_user 	= Database::get_course_table(TABLE_BLOGS_REL_USER);
		$tbl_user_permissions 	= Database::get_course_table(TABLE_PERMISSION_USER);

		// Unsubscribe the user
		$sql = "DELETE FROM $tbl_blogs_rel_user WHERE blog_id = '".(int)$blog_id."' AND user_id = '".(int)$user_id."'";
		$result = @Database::query($sql);

		// Remove this user's permissions.
		$sql = "DELETE FROM $tbl_user_permissions WHERE user_id = '".(int)$user_id."'";
		$result = Database::query($sql);
	}

	/**
	 * Displays the form to register users in a blog (in a course)
	 * The listed users are users subcribed in the course.
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 *
	 * @return Html Form with sortable table with users to subcribe in a blog, in a course.
	 */
	public static function display_form_user_subscribe ($blog_id) {
		// Init
		global $_course;
		$is_western_name_order = api_is_western_name_order();
		$currentCourse = $_course['sysCode'];
		$tbl_users 			= Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user = Database::get_course_table(TABLE_BLOGS_REL_USER);
		$table_course_user 	= Database::get_main_table(TABLE_MAIN_COURSE_USER);

		echo '<legend>'.get_lang('SubscribeMembers').'</legend>';
		$course_id = api_get_course_int_id();
		$properties["width"] = "100%";

		// Get blog members' id.
		$sql = "SELECT user.user_id FROM $tbl_users user
				INNER JOIN $tbl_blogs_rel_user blogs_rel_user
				ON user.user_id = blogs_rel_user.user_id
				WHERE blogs_rel_user.c_id = $course_id AND blogs_rel_user.blog_id = '".intval($blog_id)."'";
		$result = Database::query($sql);

		$blog_member_ids = array();
		while($user = Database::fetch_array($result))
		{
			$blog_member_ids[] = $user['user_id'];
		}

		// Set table headers
		$column_header[] = array ('', false, '');
		if ($is_western_name_order) {
			$column_header[] = array (get_lang('FirstName'), true, '');
			$column_header[] = array (get_lang('LastName'), true, '');
		} else {
			$column_header[] = array (get_lang('LastName'), true, '');
			$column_header[] = array (get_lang('FirstName'), true, '');
		}
		$column_header[] = array (get_lang('Email'), false, '');
		$column_header[] = array (get_lang('Register'), false, '');

		if(isset($_SESSION['session_id'])){
			$session_id = intval($_SESSION['session_id']);
		}
		else{
			$session_id = 0;
		}

		$student_list = CourseManager :: get_student_list_from_course_code($currentCourse, false, $session_id);
		$user_data = array ();

		// Add users that are not in this blog to the list.
		foreach($student_list as $key=>$user) {
			if(isset($user['id_user'])) {
				$user['user_id'] = $user['id_user'];
			}
			if(!in_array($user['user_id'],$blog_member_ids)) {
				$a_infosUser = UserManager :: get_user_info_by_id($user['user_id']);
				$row = array ();
				$row[] = '<input type="checkbox" name="user[]" value="' . $a_infosUser['user_id'] . '" '.(($_GET['selectall'] == "subscribe") ? ' checked="checked" ' : '') . '/>';
				$username = api_htmlentities(sprintf(get_lang('LoginX'), $a_infosUser["username"]), ENT_QUOTES);
				if ($is_western_name_order) {
					$row[] = $a_infosUser["firstname"];
					$row[] = Display::tag('span', $a_infosUser["lastname"], array('title'=>$username));
				} else {
					$row[] = Display::tag('span', $a_infosUser["lastname"], array('title'=>$username));
					$row[] = $a_infosUser["firstname"];
				}
				$row[] = Display::icon_mailto_link($a_infosUser["email"]);

				//Link to register users
				if($a_infosUser["user_id"] != $_SESSION['_user']['user_id'])
				{
					$row[] = "<a class=\"btn \" href=\"" .api_get_self()."?action=manage_members&amp;blog_id=$blog_id&amp;register=yes&amp;user_id=" . $a_infosUser["user_id"]."\">" . get_lang('Register')."</a>";
				}
				else
				{
					$row[] = '';
				}
				$user_data[] = $row;
			}
		}

		// Display
		$query_vars['action'] = 'manage_members';
		$query_vars['blog_id'] = $blog_id;
		echo '<form method="post" action="blog.php?action=manage_members&amp;blog_id=' . $blog_id . '">';
			Display::display_sortable_table($column_header, $user_data,null,null,$query_vars);
			$link = '';
			$link .= isset ($_GET['action']) ? 'action=' . Security::remove_XSS($_GET['action']) . '&amp;' : '';
			$link .= "blog_id=$blog_id&amp;";

			echo '<a href="blog.php?' . $link . 'selectall=subscribe">' . get_lang('SelectAll') . '</a> - ';
			echo '<a href="blog.php?' . $link . '">' . get_lang('UnSelectAll') . '</a> ';
			echo get_lang('WithSelected') . ' : ';
			echo '<select name="action">';
			echo '<option value="select_subscribe">' . get_lang('Register') . '</option>';
			echo '</select>';
			echo '<input type="hidden" name="register" value="true" />';
			echo '<button class="save" type="submit">' . get_lang('Ok') . '</button>';
		echo '</form>';
	}


	/**
	 * Displays the form to register users in a blog (in a course)
	 * The listed users are users subcribed in the course.
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 *
	 * @return Html Form with sortable table with users to unsubcribe from a blog.
	 */
	public static function display_form_user_unsubscribe ($blog_id) {
		global $_user;
		$is_western_name_order = api_is_western_name_order();

		// Init
		$tbl_users 			= Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user = Database::get_course_table(TABLE_BLOGS_REL_USER);

		echo '<legend>'.get_lang('UnsubscribeMembers').'</legend>';

		$properties["width"] = "100%";
		//table column titles
		$column_header[] = array ('', false, '');
		if ($is_western_name_order) {
			$column_header[] = array (get_lang('FirstName'), true, '');
			$column_header[] = array (get_lang('LastName'), true, '');
		} else {
			$column_header[] = array (get_lang('LastName'), true, '');
			$column_header[] = array (get_lang('FirstName'), true, '');
		}
		$column_header[] = array (get_lang('Email'), false, '');
		$column_header[] = array (get_lang('TaskManager'), true, '');
		$column_header[] = array (get_lang('UnRegister'), false, '');

		$course_id = api_get_course_int_id();

		$sql_query = "SELECT user.user_id, user.lastname, user.firstname, user.email, user.username
			FROM $tbl_users user INNER JOIN $tbl_blogs_rel_user blogs_rel_user
			ON user.user_id = blogs_rel_user.user_id
			WHERE blogs_rel_user.c_id = $course_id AND  blogs_rel_user.blog_id = '".(int)$blog_id."'";

		if (!($sql_result = Database::query($sql_query))) {
			return false;
		}

		$user_data = array ();

		while($myrow = Database::fetch_array($sql_result)) {
			$row = array ();
			$row[] = '<input type="checkbox" name="user[]" value="' . $myrow['user_id'] . '" '.(($_GET['selectall'] == "unsubscribe") ? ' checked="checked" ' : '') . '/>';
			$username = api_htmlentities(sprintf(get_lang('LoginX'), $myrow["username"]), ENT_QUOTES);
			if ($is_western_name_order) {
				$row[] = $myrow["firstname"];
				$row[] = Display::tag('span', $myrow["lastname"], array('title'=>$username));
			} else {
				$row[] = Display::tag('span', $myrow["lastname"], array('title'=>$username));
				$row[] = $myrow["firstname"];
			}
			$row[] = Display::icon_mailto_link($myrow["email"]);

			$sql = "SELECT bt.title task
			FROM " . Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER) . " btu
			INNER JOIN " . Database::get_course_table(TABLE_BLOGS_TASKS) . " bt ON btu.task_id = bt.task_id
			WHERE 	btu.c_id 	= $course_id  AND
					bt.c_id 	= $course_id  AND
					btu.blog_id = $blog_id AND
					btu.user_id = " . $myrow['user_id'];

			if (!($sql_res = Database::query($sql))) {
				die(Database::error());
			}

			$task = '';

			while($r = Database::fetch_array($sql_res)) {
				$task .= stripslashes($r['task']) . ', ';
			}
			//echo $task;
			$task = (api_strlen(trim($task)) != 0) ? api_substr($task, 0, api_strlen($task) - 2) : get_lang('Reader');
			$row[] = $task;
			//Link to register users

			if($myrow["user_id"] != $_user['user_id']) {
				$row[] = "<a class=\"btn\" href=\"" .api_get_self()."?action=manage_members&amp;blog_id=$blog_id&amp;unregister=yes&amp;user_id=" . $myrow[user_id]."\">" . get_lang('UnRegister')."</a>";
			} else {
				$row[] = '';
			}

			$user_data[] = $row;
		}

		$query_vars['action'] = 'manage_members';
		$query_vars['blog_id'] = $blog_id;
		echo '<form method="post" action="blog.php?action=manage_members&amp;blog_id=' . $blog_id . '">';
		Display::display_sortable_table($column_header, $user_data,null,null,$query_vars);
		$link = '';
		$link .= isset ($_GET['action']) ? 'action=' . Security::remove_XSS($_GET['action']). '&amp;' : '';
		$link .= "blog_id=$blog_id&amp;";

		echo '<a href="blog.php?' . $link . 'selectall=unsubscribe">' . get_lang('SelectAll') . '</a> - ';
		echo '<a href="blog.php?' . $link . '">' . get_lang('UnSelectAll') . '</a> ';
		echo get_lang('WithSelected') . ' : ';
		echo '<select name="action">';
		echo '<option value="select_unsubscribe">' . get_lang('UnRegister') . '</option>';
		echo '</select>';
		echo '<input type="hidden" name="unregister" value="true" />';
		echo '<button class="save" type="submit">' . get_lang('Ok') . '</button>';
		echo '</form>';
	}

	/**
	 * Displays a matrix with selectboxes. On the left: users, on top: possible rights.
	 * The blog admin can thus select what a certain user can do in the current blog
	 *
	 * @param Integer $blog_id
	 */
	public static function display_form_user_rights ($blog_id) {
		// Init
		$tbl_users 			= Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_rel_user = Database::get_course_table(TABLE_BLOGS_REL_USER);

		echo '<legend>'.get_lang('RightsManager').'</legend>';
		echo '<br />';

		// Integration of patricks permissions system.
		require_once api_get_path(SYS_CODE_PATH).'permissions/blog_permissions.inc.php';
	}

	/**
	 * Displays the form to create a new post
	 * @author Toon Keppens
	 *
	 * @param Integer $blog_id
	 */
	public static function display_new_comment_form ($blog_id, $post_id, $title) {
		echo '<form name="add_post" enctype="multipart/form-data" method="post" action="blog.php?action=view_post&amp;blog_id=' . intval($blog_id) . '&amp;post_id=' . intval($post_id) . '">';

		// form title
		echo '<legend>';
		echo (isset($_GET['task_id']) ? get_lang('ExecuteThisTask') : get_lang('AddNewComment'));
		echo '</legend>';

		// comment title
		echo '<div><span class="form_required">*</span>' . get_lang('Title') . ': <input name="comment_title" id="comment_title" type="text" size="60" value="Re: '.stripslashes($title) . '" /></div><br />';

		// comment text
		$oFCKeditor = new FCKeditor('comment_text') ;
		$oFCKeditor->Width		= '100%';
		$oFCKeditor->Height		= '200';
		if(!api_is_allowed_to_edit())
		{
			$oFCKeditor->ToolbarSet = 'ProjectCommentStudent';
		}
		else
		{
			$oFCKeditor->ToolbarSet = 'ProjectComment';
		}
		$oFCKeditor->Value		= isset($_POST['comment_text'])?stripslashes($_POST['comment_text']):'';
		echo '<div class="controls">';
		echo $oFCKeditor->Create() ;
		echo '
				</div>';

		// attachment
		echo '	<div class="control-group">
					<label class="control-label">
						' . get_lang('AddAnAttachment') . '
					</label>
					<div class="controls">
						<input type="file" name="user_upload"/>
					</div>
				</div>';

		// attachment comment
		echo '	<div class="control-group">
					<label class="control-label">
						' . get_lang('FileComment') . '
					</label>
					<div class="controls">
						<textarea name="post_file_comment" cols="34" /></textarea>
					</div>
				</div>';

		// attachment comment
		echo '	<div class="control-group">					
					<div class="controls">
							 <input type="hidden" name="action" value="" />
							 <input type="hidden" name="comment_parent_id" id="comment_parent_id" value="0" />';
									if(isset($_GET['task_id']))
									{
										echo ' <input type="hidden" name="new_task_execution_submit" value="true" />';
										echo ' <input type="hidden" name="task_id" value="' . intval($_GET['task_id']) . '" />';
									}
									else
									{
										echo ' <input type="hidden" name="new_comment_submit" value="true" />';
									}
		echo '					<button class="save" type="submit" name="Submit">' . get_lang('Save') . '</button>
					</div>
				</div>';
		echo '</form>';
	}


	/**
	 * show the calender of the given month
	 * @author Patrick Cool
	 * @author Toon Keppens
	 *
	 * @param Array $blogitems an array containing all the blog items for the given month
	 * @param Integer $month: the integer value of the month we are viewing
	 * @param Integer $year: the 4-digit year indication e.g. 2005
	 * @param String $monthName: the language variable for the mont name
	 *
	 * @return html code
	*/
	public static function display_minimonthcalendar ($month, $year, $blog_id) {
		// Init
		global $_user;
		global $DaysShort;
		global $MonthsLong;

		$posts = array();
		$tasks = array();

		$tbl_users = Database::get_main_table(TABLE_MAIN_USER);
		$tbl_blogs_posts = Database::get_course_table(TABLE_BLOGS_POSTS);
		$tbl_blogs_tasks = Database::get_course_table(TABLE_BLOGS_TASKS);
		$tbl_blogs_tasks_rel_user = Database::get_course_table(TABLE_BLOGS_TASKS_REL_USER);
		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);

		$course_id = api_get_course_int_id();

		//Handle leap year
		$numberofdays = array (0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

		if(($year % 400 == 0) or ($year % 4 == 0 and $year % 100 <> 0))
			$numberofdays[2] = 29;

		//Get the first day of the month
		$dayone = getdate(mktime(0, 0, 0, $month, 1, $year));
		$monthName = $MonthsLong[$month-1];

		//Start the week on monday
		$startdayofweek = $dayone['wday'] <> 0 ? ($dayone['wday'] - 1) : 6;
		$backwardsURL = api_get_self()."?blog_id=" . (int)$_GET['blog_id']."&amp;filter=" . Security::remove_XSS($_GET['filter'])."&amp;month=". ($month == 1 ? 12 : $month -1)."&amp;year=". ($month == 1 ? $year -1 : $year);
		$forewardsURL = api_get_self()."?blog_id=" . (int)$_GET['blog_id']."&amp;filter=" . Security::remove_XSS($_GET['filter'])."&amp;month=". ($month == 12 ? 1 : $month +1)."&amp;year=". ($month == 12 ? $year +1 : $year);

		// Get posts for this month
		$sql = "SELECT post.*, DAYOFMONTH(date_creation) as post_day, user.lastname, user.firstname FROM $tbl_blogs_posts post
				INNER JOIN $tbl_users user
				ON post.author_id = user.user_id
				WHERE 	post.c_id = $course_id AND
						post.blog_id = '".(int)$blog_id."' AND
						MONTH(date_creation) = '".(int)$month."' AND
						YEAR(date_creation) = '".(int)$year."'
				ORDER BY date_creation";
		$result = Database::query($sql);

		// We will create an array of days on which there are posts.
		if( Database::num_rows($result) > 0) {
			while($blog_post = Database::fetch_array($result)) {
				// If the day of this post is not yet in the array, add it.
				if(!in_array($blog_post['post_day'], $posts))
					$posts[] = $blog_post['post_day'];
			}
		}

		// Get tasks for this month
		if($_user['user_id']) {
			$sql = " SELECT task_rel_user.*,  DAYOFMONTH(target_date) as task_day, task.title, blog.blog_name
				FROM $tbl_blogs_tasks_rel_user task_rel_user
				INNER JOIN $tbl_blogs_tasks task ON task_rel_user.task_id = task.task_id
				INNER JOIN $tbl_blogs blog ON task_rel_user.blog_id = blog.blog_id
				WHERE
				task_rel_user.c_id = $course_id AND
				task.c_id = $course_id AND
				blog.c_id = $course_id AND
				task_rel_user.user_id = '".(int)$_user['user_id']."'
				AND	MONTH(target_date) = '".(int)$month."'
				AND	YEAR(target_date) = '".(int)$year."'
				ORDER BY target_date ASC";
			$result = Database::query($sql);

			if (Database::num_rows($result) > 0)
			{
				while($mytask = Database::fetch_array($result))
				{

					$tasks[$mytask['task_day']][$mytask['task_id']]['task_id'] = $mytask['task_id'];
					$tasks[$mytask['task_day']][$mytask['task_id']]['title'] = $mytask['title'];
					$tasks[$mytask['task_day']][$mytask['task_id']]['blog_id'] = $mytask['blog_id'];
					$tasks[$mytask['task_day']][$mytask['task_id']]['blog_name'] = $mytask['blog_name'];
					$tasks[$mytask['task_day']][$mytask['task_id']]['day'] = $mytask['task_day'];
					//echo '<li><a href="blog.php?action=execute_task&amp;blog_id=' . $mytask['blog_id'] . '&amp;task_id='.stripslashes($mytask['task_id']) . '" title="[Blog: ' . $mytask['blog_name'] . '] ' . get_lang('ExecuteThisTask') . '">'.stripslashes($mytask['title']) . '</a></li>';
				}
			}
		}

		echo 	'<table id="smallcalendar" class="data_table">',
				"<tr id=\"title\">\n",
				"<th width=\"10%\"><a href=\"", $backwardsURL, "\">&laquo;</a></th>\n",
				"<th align=\"center\" width=\"80%\" colspan=\"5\">", $monthName, " ", $year, "</th>\n",
				"<th width=\"10%\" align=\"right\"><a href=\"", $forewardsURL, "\">&raquo;</a></th>\n", "</tr>\n";

		echo "<tr>\n";

		for($ii = 1; $ii < 8; $ii ++)
			echo "<td class=\"weekdays\">", $DaysShort[$ii % 7], "</td>\n";

		echo "</tr>\n";

		$curday = -1;
		$today = getdate();

		while($curday <= $numberofdays[$month])
		{
			echo "<tr>\n";

			for($ii = 0; $ii < 7; $ii ++)
			{
				if(($curday == -1) && ($ii == $startdayofweek))
					$curday = 1;

				if(($curday > 0) && ($curday <= $numberofdays[$month]))
				{
					$bgcolor = $ii < 5 ? $class="class=\"days_week\"" : $class="class=\"days_weekend\"";
					$dayheader = "$curday";

					if(($curday == $today[mday]) && ($year == $today[year]) && ($month == $today[mon]))
					{
						$dayheader = "$curday";
						$class = "class=\"days_today\"";
					}

					echo "\t<td " . $class.">";

					// If there are posts on this day, create a filter link.
					if(in_array($curday, $posts))
						echo '<a href="blog.php?blog_id=' . $blog_id . '&amp;filter=' . $year . '-' . $month . '-' . $curday . '&amp;month=' . $month . '&amp;year=' . $year . '" title="' . get_lang('ViewPostsOfThisDay') . '">' . $curday . '</a>';
					else
						echo $dayheader;

					if (count($tasks) > 0)
					{
						if (is_array($tasks[$curday]))
						{
							// Add tasks to calendar
							foreach ($tasks[$curday] as $task)
							{
								echo '<a href="blog.php?action=execute_task&amp;blog_id=' . $task['blog_id'] . '&amp;task_id='.stripslashes($task['task_id']) . '" title="' . $task['title'] . ' : ' . get_lang('InBlog') . ' : ' . $task['blog_name'] . ' - ' . get_lang('ExecuteThisTask') . '"><img src="../img/blog_task.gif" alt="Task" title="' . get_lang('ExecuteThisTask') . '" /></a>';
							}
						}
					}

					echo "</td>\n";

					$curday ++;
				}
				else
					echo "<td>&nbsp;</td>\n";
			}

			echo "</tr>\n";
		}

		echo "</table>\n";
	}

	/**
	 * Blog admin | Display the form to add a new blog.
	 *
	 */
	public static function display_new_blog_form () {

        $form = new FormValidator('add_blog', 'post','blog_admin.php?action=add');
        $form->addElement('header', get_lang('AddBlog'));
        $form->addElement('text', 'blog_name', get_lang('Title'));
        $form->addElement('textarea', 'blog_subtitle', get_lang('Subtitle'));

        $form->addElement('hidden', 'new_blog_submit', 'true');
        $form->addElement('style_submit_button', null, get_lang('SaveProject'));

        $defaults = array();
        $defaults['blog_name'] = Security::remove_XSS($_POST['blog_name']);
        $defaults['blog_subtitle'] = Security::remove_XSS($_POST['blog_subtitle']);
        $form->setDefaults($defaults);
        $form->display();
	}

	/**
	 * Blog admin | Display the form to edit a blog.
	 *
	 */
	public static function display_edit_blog_form ($blog_id) {
	    $course_id = api_get_course_int_id();
		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);

		$sql = "SELECT blog_id, blog_name, blog_subtitle FROM $tbl_blogs WHERE c_id = $course_id AND blog_id = '".(int)$blog_id."'";
		$result = Database::query($sql);
		$blog = Database::fetch_array($result);

		// the form contained errors but we do not want to lose the changes the user already did
		if ($_POST) {
			$blog['blog_name'] 		= Security::remove_XSS($_POST['blog_name']);
			$blog['blog_subtitle'] 	= Security::remove_XSS($_POST['blog_subtitle']);
		}

        $form = new FormValidator('edit_blog', 'post','blog_admin.php?action=edit&blog_id='.Security::remove_XSS($_GET['blog_id']));
        $form->addElement('header', get_lang('EditBlog'));
        $form->addElement('text', 'blog_name', get_lang('Title'));
        $form->addElement('textarea', 'blog_subtitle', get_lang('Subtitle'));

        $form->addElement('hidden', 'edit_blog_submit', 'true');
        $form->addElement('hidden', 'blog_id', $blog['blog_id']);
        $form->addElement('style_submit_button', null, get_lang('Save'));

        $defaults = array();
        $defaults['blog_name'] = $blog['blog_name'];
        $defaults['blog_subtitle'] = $blog['blog_subtitle'];
        $form->setDefaults($defaults);
        $form->display();
	}

	/**
	 * Blog admin | Returns table with blogs in this course
	 */
	public static function display_blog_list () {
		global $charset, $_user;
        $course_id = api_get_course_int_id();
		// Init
		$counter = 0;

		$tbl_blogs = Database::get_course_table(TABLE_BLOGS);

		//condition for the session
		$session_id = api_get_session_id();
		$condition_session = api_get_session_condition($session_id, false);

		$sql = "SELECT blog_name,blog_subtitle,visibility,blog_id FROM $tbl_blogs WHERE c_id = $course_id ORDER BY date_creation DESC";
		$result = Database::query($sql);
		if (Database::num_rows($result)) {
			while ($row_project=Database::fetch_row($result)) {
				$list_info[]=$row_project;
			}
		}


		$list_content_blog = array();
		$list_body_blog = array();

		if (is_array($list_info)) {
			foreach($list_info as $key => $info_log) {
				//validacion when belongs to a session
				$session_img = api_get_session_image($info_log[4], $_user['status']);

				$url_start_blog = 'blog.php' ."?". "blog_id=".$info_log[3]. "&amp;".api_get_cidreq();
				$title = $info_log[0];
    			$image = '<img src="../img/blog.gif" border="0" align="absmiddle" alt="' . $title . '">'."\n";
    			$list_name = '<div style="float: left; width: 35px; height: 22px;"><a href="'.$url_start_blog.'">' . $image . '</a></div><a href="'.$url_start_blog.'">' .$title. '</a>' . $session_img . "\n";

				$list_body_blog[] = $list_name;
				$list_body_blog[] = $info_log[1];

				$visibility_icon=($info_log[2]==0) ? 'invisible' : 'visible';
				$visibility_info=($info_log[2]==0) ? 'Visible' : 'Invisible';
			 	$my_image.='<a href="' .api_get_self(). '?action=edit&amp;blog_id=' . $info_log[3] . '">';
				$my_image.='<img src="../img/edit.gif" border="0" title="' . get_lang('EditBlog') . '" />';
				$my_image.="</a>\n";
				$my_image.='<a href="' .api_get_self(). '?action=delete&amp;blog_id=' . $info_log[3] . '" ';
				$my_image.='onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES,$charset)). '\')) return false;" >';
				$my_image.='<img src="../img/delete.gif" border="0" title="' . get_lang('DeleteBlog') . '" />';
				$my_image.="</a>\n";
				$my_image.='<a href="' .api_get_self(). '?action=visibility&amp;blog_id=' . $info_log[3] . '">';
				$my_image.='<img src="../img/' . $visibility_icon . '.gif" border="0" title="' . get_lang($visibility_info) . '" />';
				$my_image.="</a>\n";

				$list_body_blog[]=$my_image;
				$my_image='';

				$list_content_blog[]=$list_body_blog;
				$list_body_blog = array();

			}
			$parameters='';
			//$parameters=array('action'=>Security::remove_XSS($_GET['action']));
			$table = new SortableTableFromArrayConfig($list_content_blog, 1,20,'project');
			//$table->set_additional_parameters($parameters);
			$table->set_header(0, get_lang('Title'));
			$table->set_header(1, get_lang('Subtitle'));
			$table->set_header(2, get_lang('Modify'));
			$table->display();
		}
	}

}

/**
 *
 * END CLASS BLOG
 *
 */

/**
 * Show a list with all the attachments according the parameter's
 * @param the blog's id
 * @param the post's id
 * @param the comment's id
 * @return array with the post info according the parameters
 * @author Julio Montoya Dokeos
 * @version avril 2008, dokeos 1.8.5
 */
function get_blog_attachment($blog_id, $post_id=null,$comment_id=null)
{
	$blog_table_attachment = Database::get_course_table(TABLE_BLOGS_ATTACHMENT);

	$blog_id = intval($blog_id);
	$comment_id = intval($comment_id);
	$post_id = intval($post_id);
	$row=array();
	$where='';
	if (!empty ($post_id) && is_numeric($post_id)) {
		$where.=' AND post_id ="'.$post_id.'" ';
	}

	if (!empty ($comment_id) && is_numeric($comment_id)) {
		if (!empty ($post_id)) {
			$where.= ' AND ';
		}
		$where.=' comment_id ="'.$comment_id.'" ';
	}

    $course_id = api_get_course_int_id();

	$sql = 'SELECT path, filename, comment FROM '. $blog_table_attachment.' WHERE c_id = '.$course_id.' AND blog_id ="'.intval($blog_id).'"  '.$where;

	$result=Database::query($sql);
	if (Database::num_rows($result)!=0) {
		$row=Database::fetch_array($result);
	}
	return $row;
}

/**
 * Delete the all the attachments according the parameters.
 * @param the blog's id
 * @param the post's id
 * @param the comment's id
 * @author Julio Montoya Dokeos
 * @version avril 2008, dokeos 1.8.5
 */

function delete_all_blog_attachment($blog_id,$post_id=null,$comment_id=null)
{

	global $_course;
	$blog_table_attachment = Database::get_course_table(TABLE_BLOGS_ATTACHMENT);
	$blog_id = intval($blog_id);
	$comment_id = intval($comment_id);
	$post_id = intval($post_id);

    $course_id = api_get_course_int_id();

	// delete files in DB
	if (!empty ($post_id) && is_numeric($post_id) )
	{
		$where.=' AND post_id ="'.$post_id.'" ';
	}

	if (!empty ($comment_id) && is_numeric($comment_id)   )
	{
		if (!empty ($post_id) )
		{
			$where.= ' AND ';
		}
		$where.=' comment_id ="'.$comment_id.'" ';
	}

	// delete all files in directory
	$courseDir   = $_course['path'].'/upload/blog';
	$sys_course_path = api_get_path(SYS_COURSE_PATH);
	$updir = $sys_course_path.$courseDir;

	$sql= 'SELECT path FROM '.$blog_table_attachment.' WHERE c_id = '.$course_id.' AND blog_id ="'.intval($blog_id).'"  '.$where;
	$result=Database::query($sql);

	while ($row=Database::fetch_row($result))
	{
		$file=$updir.'/'.$row[0];
		if (Security::check_abs_path($file,$updir) )
		{
			@ unlink($file);
		}
	}
	$sql = 'DELETE FROM '. $blog_table_attachment.' WHERE c_id = '.$course_id.' AND  blog_id ="'.intval($blog_id).'"  '.$where;
	Database::query($sql);
}
/**
 * Gets all the post from a given user id
 * @param string db course name
 * @param int user id
 */
function get_blog_post_from_user($course_code, $user_id) {
		$tbl_blogs 		= Database::get_course_table(TABLE_BLOGS);
		$tbl_blog_post 	= Database::get_course_table(TABLE_BLOGS_POSTS);
		$course_info 	= api_get_course_info($course_code);
		$course_id 		= $course_info['real_id'];

		$sql = "SELECT DISTINCT blog.blog_id, post_id, title, full_text, post.date_creation
				FROM $tbl_blogs blog INNER JOIN  $tbl_blog_post post
				ON (blog.blog_id = post.blog_id)
				WHERE
					blog.c_id = $course_id AND
					post.c_id = $course_id AND
					author_id =  $user_id AND visibility = 1
				ORDER BY post.date_creation DESC ";
		$result = Database::query($sql);
		$return_data = '';

		if (Database::num_rows($result)!=0) {
			while ($row=Database::fetch_array($result)) {
				$return_data.=  '<div class="clear"></div><br />';
	 			$return_data.=  '<div class="actions" style="margin-left:5px;margin-right:5px;">'.Display::return_icon('blog_article.png',get_lang('BlogPosts')).' '.$row['title'].'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<div style="float:right;margin-top:-18px"><a href="../blog/blog.php?blog_id='.$row['blog_id'].'&gidReq=&cidReq='.$my_course_id.' " >'.get_lang('SeeBlog').'</a></div></div>';
	 			$return_data.=  '<br / >';
				$return_data.= $row['full_text'];
				$return_data.= '<br /><br />';
			}
		}
		return $return_data;
}

/**
 * Gets all the post comments from a given user id
 * @param string db course name
 * @param int user id
 */
function get_blog_comment_from_user($course_code, $user_id) {
		$tbl_blogs 			= Database::get_course_table(TABLE_BLOGS);
		$tbl_blog_comment 	= Database::get_course_table(TABLE_BLOGS_COMMENTS);
		$user_id 			= intval($user_id);

		$course_info 		= api_get_course_info($course_code);
		$course_id 			= $course_info['real_id'];

		$sql = "SELECT DISTINCT blog.blog_id, comment_id, title, comment, comment.date_creation
				FROM $tbl_blogs blog INNER JOIN  $tbl_blog_comment comment
				ON (blog.blog_id = comment.blog_id)
				WHERE 	blog.c_id = $course_id AND
						comment.c_id = $course_id AND
						author_id =  $user_id AND
						visibility = 1
				ORDER BY blog_name";
		$result = Database::query($sql);
		$return_data = '';
		if (Database::num_rows($result)!=0) {
			while ($row=Database::fetch_array($result)) {
				$return_data.=  '<div class="clear"></div><br />';
	 			$return_data.=  '<div class="actions" style="margin-left:5px;margin-right:5px;">'.$row['title'].'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<div style="float:right;margin-top:-18px"><a href="../blog/blog.php?blog_id='.$row['blog_id'].'&gidReq=&cidReq='.Security::remove_XSS($course_code).' " >'.get_lang('SeeBlog').'</a></div></div>';
	 			$return_data.=  '<br / >';
				//$return_data.=  '<strong>'.$row['title'].'</strong>'; echo '<br>';*/
				$return_data.=  $row['comment'];
				$return_data.=  '<br />';
			}
		}
		return $return_data;
}

?>