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<?php
/***************************************************************************
*                                 prune.php
*                            -------------------
*   begin                : Thursday, June 14, 2001
*   copyright            : (C) 2001 The phpBB Group
*   email                : support@phpbb.com
*
*   $Id: prune.php,v 1.19.2.6 2003/03/18 23:23:57 acydburn Exp $
*
*
***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

if ( !defined('IN_PHPBB') )
{
   die("Hacking attempt");
}

require($phpbb_root_path . 'includes/functions_search.'.$phpEx);

function prune($forum_id, $prune_date, $prune_all = false)
{
	global $db, $lang;
	$sql = "SELECT *
		FROM " . PRUNE_TABLE . "
		WHERE forum_id = $forum_id";
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Could not read auto_prune table', '', __LINE__, __FILE__, $sql);
	}

	$row = $db->sql_fetchrow($result);

	$prune_type = ( $prune_all ) ? PRUNE_DELETE : $row['prune_type'];
	$move_to = $row['move_to'];

	$prune_all = ($prune_all) ? '' : 'AND t.topic_vote = 0 AND t.topic_type <> ' . POST_ANNOUNCE;
	//
	// Those without polls and announcements ... unless told otherwise!
	//
	$sql = "SELECT t.topic_id
		FROM " . POSTS_TABLE . " p, " . TOPICS_TABLE . " t
		WHERE t.forum_id = $forum_id
			$prune_all
			AND ( p.post_id = t.topic_last_post_id
				OR t.topic_last_post_id = 0 )";
	if ( $prune_date != '' )
	{
		$sql .= " AND p.post_time < $prune_date";
	}

	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Could not obtain lists of topics to prune', '', __LINE__, __FILE__, $sql);
	}

	$sql_topics = '';
	while( $row = $db->sql_fetchrow($result) )
	{
		$sql_topics .= ( ( $sql_topics != '' ) ? ', ' : '' ) . $row['topic_id'];
	}
	$db->sql_freeresult($result);

	if( $sql_topics != '' )
	{
		if ( $prune_type == PRUNE_MOVE || $prune_type == PRUNE_LOCK )
		{
			$move_sql = ( $prune_type == PRUNE_MOVE ) ? "forum_id = $move_to," : '';

			$sql = "UPDATE " . TOPICS_TABLE . "
				SET $move_sql topic_status = " . TOPIC_LOCKED . "
				WHERE forum_id = $forum_id
					AND topic_id IN ($sql_topics)";
			if ( !$db->sql_query($sql, BEGIN_TRANSACTION) )
			{
				message_die(GENERAL_ERROR, 'Could not move/lock topics during prune', '', __LINE__, __FILE__, $sql);
			}

			$pruned_topics = $db->sql_affectedrows();

			if ( $prune_type == PRUNE_MOVE )
			{
				$sql = "UPDATE " . POSTS_TABLE . "
					SET forum_id = $move_to
					WHERE forum_id = $forum_id
						AND topic_id IN ($sql_topics)";
				if ( !$db->sql_query($sql, BEGIN_TRANSACTION) )
				{
					message_die(GENERAL_ERROR, 'Could not move posts during prune', '', __LINE__, __FILE__, $sql);
				}

				$pruned_posts = $db->sql_affectedrows();

				sync('forum', $move_to);
			}

			return array ('topics' => $pruned_topics, 'posts' => $pruned_posts);
		}
		else
		{
			$sql = "SELECT post_id
				FROM " . POSTS_TABLE . "
				WHERE forum_id = $forum_id
					AND topic_id IN ($sql_topics)";
			if ( !($result = $db->sql_query($sql)) )
			{
				message_die(GENERAL_ERROR, 'Could not obtain list of posts to prune', '', __LINE__, __FILE__, $sql);
			}

			$sql_post = '';
			while ( $row = $db->sql_fetchrow($result) )
			{
				$sql_post .= ( ( $sql_post != '' ) ? ', ' : '' ) . $row['post_id'];
			}
			$db->sql_freeresult($result);

			if ( $sql_post != '' )
			{
				$sql = "DELETE FROM " . TOPICS_WATCH_TABLE . "
					WHERE topic_id IN ($sql_topics)";
				if ( !$db->sql_query($sql, BEGIN_TRANSACTION) )
				{
					message_die(GENERAL_ERROR, 'Could not delete watched topics during prune', '', __LINE__, __FILE__, $sql);
				}

				$sql = "DELETE FROM " . TOPICS_TABLE . "
					WHERE topic_id IN ($sql_topics)";
				if ( !$db->sql_query($sql) )
				{
					message_die(GENERAL_ERROR, 'Could not delete topics during prune', '', __LINE__, __FILE__, $sql);
				}

                		$pruned_topics = $db->sql_affectedrows();

                		$sql = "DELETE FROM " . POSTS_TABLE . "
                    		WHERE post_id IN ($sql_post)";
				if ( !$db->sql_query($sql) )
				{
					message_die(GENERAL_ERROR, 'Could not delete post_text during prune', '', __LINE__, __FILE__, $sql);
				}

				$pruned_posts = $db->sql_affectedrows();

				$sql = "DELETE FROM " . POSTS_TEXT_TABLE . "
					WHERE post_id IN ($sql_post)";
				if ( !$db->sql_query($sql) )
				{
					message_die(GENERAL_ERROR, 'Could not delete post during prune', '', __LINE__, __FILE__, $sql);
				}

				remove_search_post($sql_post);

				return array ('topics' => $pruned_topics, 'posts' => $pruned_posts);
			}
}

//
// Function auto_prune(), this function will read the configuration data from
// the auto_prune table and call the prune function with the necessary info.
//
function auto_prune($forum_id = 0)
{
	global $db, $lang;

	$sql = "SELECT *
		FROM " . PRUNE_TABLE . "
		WHERE forum_id = $forum_id";
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Could not read auto_prune table', '', __LINE__, __FILE__, $sql);
	}

	if ( $row = $db->sql_fetchrow($result) )
	{
		if ( $row['prune_freq'] && $row['prune_days'] )
		{
			$prune_date = time() - ( $row['prune_days'] * 86400 );
			$next_prune = time() + ( $row['prune_freq'] * 86400 );

			prune($forum_id, $prune_date);
			sync('forum', $forum_id);

			$sql = "UPDATE " . FORUMS_TABLE . "
				SET prune_next = $next_prune
				WHERE forum_id = $forum_id";
			if ( !$db->sql_query($sql) )
			{
				message_die(GENERAL_ERROR, 'Could not update forum table', '', __LINE__, __FILE__, $sql);
			}
		}
	}

	return;
}

?>