<?php

/**
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines http://www.simplemachines.org
 * @copyright 2011 Simple Machines
 * @license http://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.0.12
 */

if (!defined('SMF'))
	die('Hacking attempt...');

/*	The contents of this file handle the deletion of topics, posts, and related
	paraphernalia.  It has the following functions:

	void RemoveTopic2()
		// !!!

	void DeleteMessage()
		// !!!

	void RemoveOldTopics2()
		// !!!

	void removeTopics(array topics, bool decreasePostCount = true, bool ignoreRecycling = false)
		// !!!

	bool removeMessage(int id_msg, bool decreasePostCount = true)
		// !!!
*/

// Completely remove an entire topic.
function RemoveTopic2()
{
	global $user_info, $topic, $board, $sourcedir, $smcFunc, $context, $modSettings;

	// Make sure they aren't being lead around by someone. (:@)
	checkSession('get');

	// This file needs to be included for sendNotifications().
	require_once($sourcedir . '/Subs-Post.php');

	// Trying to fool us around, are we?
	if (empty($topic))
		redirectexit();

	$request = $smcFunc['db_query']('', '
		SELECT t.id_member_started, ms.subject, t.approved
		FROM {db_prefix}topics AS t
			INNER JOIN {db_prefix}messages AS ms ON (ms.id_msg = t.id_first_msg)
		WHERE t.id_topic = {int:current_topic}
		LIMIT 1',
		array(
			'current_topic' => $topic,
		)
	);
	list ($starter, $subject, $approved) = $smcFunc['db_fetch_row']($request);
	$smcFunc['db_free_result']($request);

	if ($starter == $user_info['id'] && !allowedTo('remove_any'))
		isAllowedTo('remove_own');
	else
		isAllowedTo('remove_any');

	// Can they see the topic?
	if ($modSettings['postmod_active'] && !$approved && $starter != $user_info['id'])
		isAllowedTo('approve_posts');

	// Notify people that this topic has been removed.
	sendNotifications($topic, 'remove');

	removeTopics($topic);

	// Note, only log topic ID in native form if it's not gone forever.
	if (allowedTo('remove_any') || (allowedTo('remove_own') && $starter == $user_info['id']))
		logAction('remove', array((empty($modSettings['recycle_enable']) || $modSettings['recycle_board'] != $board ? 'topic' : 'old_topic_id') => $topic, 'subject' => $subject, 'member' => $starter, 'board' => $board));

	redirectexit('board=' . $board . '.0');
}

// Remove just a single post.
function DeleteMessage()
{
	global $user_info, $topic, $board, $modSettings, $smcFunc;

	checkSession('get');

	$_REQUEST['msg'] = (int) $_REQUEST['msg'];

	// Is $topic set?
	if (empty($topic) && isset($_REQUEST['topic']))
		$topic = (int) $_REQUEST['topic'];

	$request = $smcFunc['db_query']('', '
		SELECT t.id_member_started, m.id_member, m.subject, m.poster_time, m.approved
		FROM {db_prefix}topics AS t
			INNER JOIN {db_prefix}messages AS m ON (m.id_msg = {int:id_msg} AND m.id_topic = {int:current_topic})
		WHERE t.id_topic = {int:current_topic}
		LIMIT 1',
		array(
			'current_topic' => $topic,
			'id_msg' => $_REQUEST['msg'],
		)
	);
	list ($starter, $poster, $subject, $post_time, $approved) = $smcFunc['db_fetch_row']($request);
	$smcFunc['db_free_result']($request);

	// Verify they can see this!
	if ($modSettings['postmod_active'] && !$approved && !empty($poster) && $poster != $user_info['id'])
		isAllowedTo('approve_posts');

	if ($poster == $user_info['id'])
	{
		if (!allowedTo('delete_own'))
		{
			if ($starter == $user_info['id'] && !allowedTo('delete_any'))
				isAllowedTo('delete_replies');
			elseif (!allowedTo('delete_any'))
				isAllowedTo('delete_own');
		}
		elseif (!allowedTo('delete_any') && ($starter != $user_info['id'] || !allowedTo('delete_replies')) && !empty($modSettings['edit_disable_time']) && $post_time + $modSettings['edit_disable_time'] * 60 < time())
			fatal_lang_error('modify_post_time_passed', false);
	}
	elseif ($starter == $user_info['id'] && !allowedTo('delete_any'))
		isAllowedTo('delete_replies');
	else
		isAllowedTo('delete_any');

	// If the full topic was removed go back to the board.
	$full_topic = removeMessage($_REQUEST['msg']);

	if (allowedTo('delete_any') && (!allowedTo('delete_own') || $poster != $user_info['id']))
		logAction('delete', array('topic' => $topic, 'subject' => $subject, 'member' => $poster, 'board' => $board));

	// We want to redirect back to recent action.
	if (isset($_REQUEST['recent']))
		redirectexit('action=recent');
	elseif (isset($_REQUEST['profile'], $_REQUEST['start'], $_REQUEST['u']))
		redirectexit('action=profile;u=' . $_REQUEST['u'] . ';area=showposts;start=' . $_REQUEST['start']);
	elseif ($full_topic)
		redirectexit('board=' . $board . '.0');
	else
		redirectexit('topic=' . $topic . '.' . $_REQUEST['start']);
}

// So long as you are sure... all old posts will be gone.
function RemoveOldTopics2()
{
	global $modSettings, $smcFunc;

	isAllowedTo('admin_forum');
	checkSession('post', 'admin');

	// No boards at all?  Forget it then :/.
	if (empty($_POST['boards']))
		redirectexit('action=admin;area=maintain;sa=topics');

	// This should exist, but we can make sure.
	$_POST['delete_type'] = isset($_POST['delete_type']) ? $_POST['delete_type'] : 'nothing';

	// Custom conditions.
	$condition = '';
	$condition_params = array(
		'boards' => array_keys($_POST['boards']),
		'poster_time' => time() - 3600 * 24 * $_POST['maxdays'],
	);

	// Just moved notice topics?
	if ($_POST['delete_type'] == 'moved')
	{
		$condition .= '
			AND m.icon = {string:icon}
			AND t.locked = {int:locked}';
		$condition_params['icon'] = 'moved';
		$condition_params['locked'] = 1;
	}
	// Otherwise, maybe locked topics only?
	elseif ($_POST['delete_type'] == 'locked')
	{
		$condition .= '
			AND t.locked = {int:locked}';
		$condition_params['locked'] = 1;
	}

	// Exclude stickies?
	if (isset($_POST['delete_old_not_sticky']))
	{
		$condition .= '
			AND t.is_sticky = {int:is_sticky}';
		$condition_params['is_sticky'] = 0;
	}

	// All we're gonna do here is grab the id_topic's and send them to removeTopics().
	$request = $smcFunc['db_query']('', '
		SELECT t.id_topic
		FROM {db_prefix}topics AS t
			INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_last_msg)
		WHERE
			m.poster_time < {int:poster_time}' . $condition . '
			AND t.id_board IN ({array_int:boards})',
		$condition_params
	);
	$topics = array();
	while ($row = $smcFunc['db_fetch_assoc']($request))
		$topics[] = $row['id_topic'];
	$smcFunc['db_free_result']($request);

	removeTopics($topics, false, true);

	// Log an action into the moderation log.
	logAction('pruned', array('days' => $_POST['maxdays']));

	redirectexit('action=admin;area=maintain;sa=topics;done=purgeold');
}

// Removes the passed id_topic's. (permissions are NOT checked here!)
function removeTopics($topics, $decreasePostCount = true, $ignoreRecycling = false)
{
	global $sourcedir, $modSettings, $smcFunc;

	// Nothing to do?
	if (empty($topics))
		return;
	// Only a single topic.
	elseif (is_numeric($topics))
		$topics = array($topics);

	// Decrease the post counts.
	if ($decreasePostCount)
	{
		$requestMembers = $smcFunc['db_query']('', '
			SELECT m.id_member, COUNT(*) AS posts
			FROM {db_prefix}messages AS m
				INNER JOIN {db_prefix}boards AS b ON (b.id_board = m.id_board)
			WHERE m.id_topic IN ({array_int:topics})
				AND m.icon != {string:recycled}
				AND b.count_posts = {int:do_count_posts}
				AND m.approved = {int:is_approved}
			GROUP BY m.id_member',
			array(
				'do_count_posts' => 0,
				'recycled' => 'recycled',
				'topics' => $topics,
				'is_approved' => 1,
			)
		);
		if ($smcFunc['db_num_rows']($requestMembers) > 0)
		{
			while ($rowMembers = $smcFunc['db_fetch_assoc']($requestMembers))
				updateMemberData($rowMembers['id_member'], array('posts' => 'posts - ' . $rowMembers['posts']));
		}
		$smcFunc['db_free_result']($requestMembers);
	}

	// Recycle topics that aren't in the recycle board...
	if (!empty($modSettings['recycle_enable']) && $modSettings['recycle_board'] > 0 && !$ignoreRecycling)
	{
		$request = $smcFunc['db_query']('', '
			SELECT id_topic, id_board, unapproved_posts, approved
			FROM {db_prefix}topics
			WHERE id_topic IN ({array_int:topics})
				AND id_board != {int:recycle_board}
			LIMIT ' . count($topics),
			array(
				'recycle_board' => $modSettings['recycle_board'],
				'topics' => $topics,
			)
		);
		if ($smcFunc['db_num_rows']($request) > 0)
		{
			// Get topics that will be recycled.
			$recycleTopics = array();
			while ($row = $smcFunc['db_fetch_assoc']($request))
			{
				if (function_exists('apache_reset_timeout'))
					@apache_reset_timeout();

				$recycleTopics[] = $row['id_topic'];

				// Set the id_previous_board for this topic - and make it not sticky.
				$smcFunc['db_query']('', '
					UPDATE {db_prefix}topics
					SET id_previous_board = {int:id_previous_board}, is_sticky = {int:not_sticky}
					WHERE id_topic = {int:id_topic}',
					array(
						'id_previous_board' => $row['id_board'],
						'id_topic' => $row['id_topic'],
						'not_sticky' => 0,
					)
				);
			}
			$smcFunc['db_free_result']($request);

			// Mark recycled topics as recycled.
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}messages
				SET icon = {string:recycled}
				WHERE id_topic IN ({array_int:recycle_topics})',
				array(
					'recycle_topics' => $recycleTopics,
					'recycled' => 'recycled',
				)
			);

			// Move the topics to the recycle board.
			require_once($sourcedir . '/MoveTopic.php');
			moveTopics($recycleTopics, $modSettings['recycle_board']);

			// Close reports that are being recycled.
			require_once($sourcedir . '/ModerationCenter.php');

			$smcFunc['db_query']('', '
				UPDATE {db_prefix}log_reported
				SET closed = {int:is_closed}
				WHERE id_topic IN ({array_int:recycle_topics})',
				array(
					'recycle_topics' => $recycleTopics,
					'is_closed' => 1,
				)
			);

			updateSettings(array('last_mod_report_action' => time()));
			recountOpenReports();

			// Topics that were recycled don't need to be deleted, so subtract them.
			$topics = array_diff($topics, $recycleTopics);
		}
		else
			$smcFunc['db_free_result']($request);
	}

	// Still topics left to delete?
	if (empty($topics))
		return;

	$adjustBoards = array();

	// Find out how many posts we are deleting.
	$request = $smcFunc['db_query']('', '
		SELECT id_board, approved, COUNT(*) AS num_topics, SUM(unapproved_posts) AS unapproved_posts,
			SUM(num_replies) AS num_replies
		FROM {db_prefix}topics
		WHERE id_topic IN ({array_int:topics})
		GROUP BY id_board, approved',
		array(
			'topics' => $topics,
		)
	);
	while ($row = $smcFunc['db_fetch_assoc']($request))
	{
		if (!isset($adjustBoards[$row['id_board']]['num_posts']))
		{
			$adjustBoards[$row['id_board']] = array(
				'num_posts' => 0,
				'num_topics' => 0,
				'unapproved_posts' => 0,
				'unapproved_topics' => 0,
				'id_board' => $row['id_board']
			);
		}
		// Posts = (num_replies + 1) for each approved topic.
		$adjustBoards[$row['id_board']]['num_posts'] += $row['num_replies'] + ($row['approved'] ? $row['num_topics'] : 0);
		$adjustBoards[$row['id_board']]['unapproved_posts'] += $row['unapproved_posts'];

		// Add the topics to the right type.
		if ($row['approved'])
			$adjustBoards[$row['id_board']]['num_topics'] += $row['num_topics'];
		else
			$adjustBoards[$row['id_board']]['unapproved_topics'] += $row['num_topics'];
	}
	$smcFunc['db_free_result']($request);

	// Decrease the posts/topics...
	foreach ($adjustBoards as $stats)
	{
		if (function_exists('apache_reset_timeout'))
			@apache_reset_timeout();

		$smcFunc['db_query']('', '
			UPDATE {db_prefix}boards
			SET
				num_posts = CASE WHEN {int:num_posts} > num_posts THEN 0 ELSE num_posts - {int:num_posts} END,
				num_topics = CASE WHEN {int:num_topics} > num_topics THEN 0 ELSE num_topics - {int:num_topics} END,
				unapproved_posts = CASE WHEN {int:unapproved_posts} > unapproved_posts THEN 0 ELSE unapproved_posts - {int:unapproved_posts} END,
				unapproved_topics = CASE WHEN {int:unapproved_topics} > unapproved_topics THEN 0 ELSE unapproved_topics - {int:unapproved_topics} END
			WHERE id_board = {int:id_board}',
			array(
				'id_board' => $stats['id_board'],
				'num_posts' => $stats['num_posts'],
				'num_topics' => $stats['num_topics'],
				'unapproved_posts' => $stats['unapproved_posts'],
				'unapproved_topics' => $stats['unapproved_topics'],
			)
		);
	}

	// Remove Polls.
	$request = $smcFunc['db_query']('', '
		SELECT id_poll
		FROM {db_prefix}topics
		WHERE id_topic IN ({array_int:topics})
			AND id_poll > {int:no_poll}
		LIMIT ' . count($topics),
		array(
			'no_poll' => 0,
			'topics' => $topics,
		)
	);
	$polls = array();
	while ($row = $smcFunc['db_fetch_assoc']($request))
		$polls[] = $row['id_poll'];
	$smcFunc['db_free_result']($request);

	if (!empty($polls))
	{
		$smcFunc['db_query']('', '
			DELETE FROM {db_prefix}polls
			WHERE id_poll IN ({array_int:polls})',
			array(
				'polls' => $polls,
			)
		);
		$smcFunc['db_query']('', '
			DELETE FROM {db_prefix}poll_choices
			WHERE id_poll IN ({array_int:polls})',
			array(
				'polls' => $polls,
			)
		);
		$smcFunc['db_query']('', '
			DELETE FROM {db_prefix}log_polls
			WHERE id_poll IN ({array_int:polls})',
			array(
				'polls' => $polls,
			)
		);
	}

	// Get rid of the attachment, if it exists.
	require_once($sourcedir . '/ManageAttachments.php');
	$attachmentQuery = array(
		'attachment_type' => 0,
		'id_topic' => $topics,
	);
	removeAttachments($attachmentQuery, 'messages');

	// Delete possible search index entries.
	if (!empty($modSettings['search_custom_index_config']))
	{
		$customIndexSettings = safe_unserialize($modSettings['search_custom_index_config']);

		$words = array();
		$messages = array();
		$request = $smcFunc['db_query']('', '
			SELECT id_msg, body
			FROM {db_prefix}messages
			WHERE id_topic IN ({array_int:topics})',
			array(
				'topics' => $topics,
			)
		);
		while ($row = $smcFunc['db_fetch_assoc']($request))
		{
			if (function_exists('apache_reset_timeout'))
				@apache_reset_timeout();

			$words = array_merge($words, text2words($row['body'], $customIndexSettings['bytes_per_word'], true));
			$messages[] = $row['id_msg'];
		}
		$smcFunc['db_free_result']($request);
		$words = array_unique($words);

		if (!empty($words) && !empty($messages))
			$smcFunc['db_query']('', '
				DELETE FROM {db_prefix}log_search_words
				WHERE id_word IN ({array_int:word_list})
					AND id_msg IN ({array_int:message_list})',
				array(
					'word_list' => $words,
					'message_list' => $messages,
				)
			);
	}

	// Delete anything related to the topic.
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}messages
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}calendar
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}log_topics
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}log_notify
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}topics
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);
	$smcFunc['db_query']('', '
		DELETE FROM {db_prefix}log_search_subjects
		WHERE id_topic IN ({array_int:topics})',
		array(
			'topics' => $topics,
		)
	);

	// Update the totals...
	updateStats('message');
	updateStats('topic');
	updateSettings(array(
		'calendar_updated' => time(),
	));

	require_once($sourcedir . '/Subs-Post.php');
	$updates = array();
	foreach ($adjustBoards as $stats)
		$updates[] = $stats['id_board'];
	updateLastMessages($updates);
}

// Remove a specific message (including permission checks).
function removeMessage($message, $decreasePostCount = true)
{
	global $board, $sourcedir, $modSettings, $user_info, $smcFunc, $context;

	if (empty($message) || !is_numeric($message))
		return false;

	$request = $smcFunc['db_query']('', '
		SELECT
			m.id_member, m.icon, m.poster_time, m.subject,' . (empty($modSettings['search_custom_index_config']) ? '' : ' m.body,') . '
			m.approved, t.id_topic, t.id_first_msg, t.id_last_msg, t.num_replies, t.id_board,
			t.id_member_started AS id_member_poster,
			b.count_posts
		FROM {db_prefix}messages AS m
			INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
			INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
		WHERE m.id_msg = {int:id_msg}
		LIMIT 1',
		array(
			'id_msg' => $message,
		)
	);
	if ($smcFunc['db_num_rows']($request) == 0)
		return false;
	$row = $smcFunc['db_fetch_assoc']($request);
	$smcFunc['db_free_result']($request);

	if (empty($board) || $row['id_board'] != $board)
	{
		$delete_any = boardsAllowedTo('delete_any');

		if (!in_array(0, $delete_any) && !in_array($row['id_board'], $delete_any))
		{
			$delete_own = boardsAllowedTo('delete_own');
			$delete_own = in_array(0, $delete_own) || in_array($row['id_board'], $delete_own);
			$delete_replies = boardsAllowedTo('delete_replies');
			$delete_replies = in_array(0, $delete_replies) || in_array($row['id_board'], $delete_replies);

			if ($row['id_member'] == $user_info['id'])
			{
				if (!$delete_own)
				{
					if ($row['id_member_poster'] == $user_info['id'])
					{
						if (!$delete_replies)
							fatal_lang_error('cannot_delete_replies', 'permission');
					}
					else
						fatal_lang_error('cannot_delete_own', 'permission');
				}
				elseif (($row['id_member_poster'] != $user_info['id'] || !$delete_replies) && !empty($modSettings['edit_disable_time']) && $row['poster_time'] + $modSettings['edit_disable_time'] * 60 < time())
					fatal_lang_error('modify_post_time_passed', false);
			}
			elseif ($row['id_member_poster'] == $user_info['id'])
			{
				if (!$delete_replies)
					fatal_lang_error('cannot_delete_replies', 'permission');
			}
			else
				fatal_lang_error('cannot_delete_any', 'permission');
		}

		// Can't delete an unapproved message, if you can't see it!
		if ($modSettings['postmod_active'] && !$row['approved'] && $row['id_member'] != $user_info['id'] && !(in_array(0, $delete_any) || in_array($row['id_board'], $delete_any)))
		{
			$approve_posts = boardsAllowedTo('approve_posts');
			if (!in_array(0, $approve_posts) && !in_array($row['id_board'], $approve_posts))
				return false;
		}
	}
	else
	{
		// Check permissions to delete this message.
		if ($row['id_member'] == $user_info['id'])
		{
			if (!allowedTo('delete_own'))
			{
				if ($row['id_member_poster'] == $user_info['id'] && !allowedTo('delete_any'))
					isAllowedTo('delete_replies');
				elseif (!allowedTo('delete_any'))
					isAllowedTo('delete_own');
			}
			elseif (!allowedTo('delete_any') && ($row['id_member_poster'] != $user_info['id'] || !allowedTo('delete_replies')) && !empty($modSettings['edit_disable_time']) && $row['poster_time'] + $modSettings['edit_disable_time'] * 60 < time())
				fatal_lang_error('modify_post_time_passed', false);
		}
		elseif ($row['id_member_poster'] == $user_info['id'] && !allowedTo('delete_any'))
			isAllowedTo('delete_replies');
		else
			isAllowedTo('delete_any');

		if ($modSettings['postmod_active'] && !$row['approved'] && $row['id_member'] != $user_info['id'] && !allowedTo('delete_own'))
			isAllowedTo('approve_posts');
	}

	// Close any moderation reports for this message.
	$smcFunc['db_query']('', '
		UPDATE {db_prefix}log_reported
		SET closed = {int:is_closed}
		WHERE id_msg = {int:id_msg}',
		array(
			'is_closed' => 1,
			'id_msg' => $message,
		)
	);
	if ($smcFunc['db_affected_rows']() != 0)
	{
		require_once($sourcedir . '/ModerationCenter.php');
		updateSettings(array('last_mod_report_action' => time()));
		recountOpenReports();
	}

	// Delete the *whole* topic, but only if the topic consists of one message.
	if ($row['id_first_msg'] == $message)
	{
		if (empty($board) || $row['id_board'] != $board)
		{
			$remove_any = boardsAllowedTo('remove_any');
			$remove_any = in_array(0, $remove_any) || in_array($row['id_board'], $remove_any);
			if (!$remove_any)
			{
				$remove_own = boardsAllowedTo('remove_own');
				$remove_own = in_array(0, $remove_own) || in_array($row['id_board'], $remove_own);
			}

			if ($row['id_member'] != $user_info['id'] && !$remove_any)
				fatal_lang_error('cannot_remove_any', 'permission');
			elseif (!$remove_any && !$remove_own)
				fatal_lang_error('cannot_remove_own', 'permission');
		}
		else
		{
			// Check permissions to delete a whole topic.
			if ($row['id_member'] != $user_info['id'])
				isAllowedTo('remove_any');
			elseif (!allowedTo('remove_any'))
				isAllowedTo('remove_own');
		}

		// ...if there is only one post.
		if (!empty($row['num_replies']))
			fatal_lang_error('delFirstPost', false);

		removeTopics($row['id_topic']);
		return true;
	}

	// Deleting a recycled message can not lower anyone's post count.
	if ($row['icon'] == 'recycled')
		$decreasePostCount = false;

	// This is the last post, update the last post on the board.
	if ($row['id_last_msg'] == $message)
	{
		// Find the last message, set it, and decrease the post count.
		$request = $smcFunc['db_query']('', '
			SELECT id_msg, id_member
			FROM {db_prefix}messages
			WHERE id_topic = {int:id_topic}
				AND id_msg != {int:id_msg}
			ORDER BY ' . ($modSettings['postmod_active'] ? 'approved DESC, ' : '') . 'id_msg DESC
			LIMIT 1',
			array(
				'id_topic' => $row['id_topic'],
				'id_msg' => $message,
			)
		);
		$row2 = $smcFunc['db_fetch_assoc']($request);
		$smcFunc['db_free_result']($request);

		$smcFunc['db_query']('', '
			UPDATE {db_prefix}topics
			SET
				id_last_msg = {int:id_last_msg},
				id_member_updated = {int:id_member_updated}' . (!$modSettings['postmod_active'] || $row['approved'] ? ',
				num_replies = CASE WHEN num_replies = {int:no_replies} THEN 0 ELSE num_replies - 1 END' : ',
				unapproved_posts = CASE WHEN unapproved_posts = {int:no_unapproved} THEN 0 ELSE unapproved_posts - 1 END') . '
			WHERE id_topic = {int:id_topic}',
			array(
				'id_last_msg' => $row2['id_msg'],
				'id_member_updated' => $row2['id_member'],
				'no_replies' => 0,
				'no_unapproved' => 0,
				'id_topic' => $row['id_topic'],
			)
		);
	}
	// Only decrease post counts.
	else
		$smcFunc['db_query']('', '
			UPDATE {db_prefix}topics
			SET ' . ($row['approved'] ? '
				num_replies = CASE WHEN num_replies = {int:no_replies} THEN 0 ELSE num_replies - 1 END' : '
				unapproved_posts = CASE WHEN unapproved_posts = {int:no_unapproved} THEN 0 ELSE unapproved_posts - 1 END') . '
			WHERE id_topic = {int:id_topic}',
			array(
				'no_replies' => 0,
				'no_unapproved' => 0,
				'id_topic' => $row['id_topic'],
			)
		);

	// Default recycle to false.
	$recycle = false;

	// If recycle topics has been set, make a copy of this message in the recycle board.
	// Make sure we're not recycling messages that are already on the recycle board.
	if (!empty($modSettings['recycle_enable']) && $row['id_board'] != $modSettings['recycle_board'] && $row['icon'] != 'recycled')
	{
		// Check if the recycle board exists and if so get the read status.
		$request = $smcFunc['db_query']('', '
			SELECT (IFNULL(lb.id_msg, 0) >= b.id_msg_updated) AS is_seen, id_last_msg
			FROM {db_prefix}boards AS b
				LEFT JOIN {db_prefix}log_boards AS lb ON (lb.id_board = b.id_board AND lb.id_member = {int:current_member})
			WHERE b.id_board = {int:recycle_board}',
			array(
				'current_member' => $user_info['id'],
				'recycle_board' => $modSettings['recycle_board'],
			)
		);
		if ($smcFunc['db_num_rows']($request) == 0)
			fatal_lang_error('recycle_no_valid_board');
		list ($isRead, $last_board_msg) = $smcFunc['db_fetch_row']($request);
		$smcFunc['db_free_result']($request);

		// Is there an existing topic in the recycle board to group this post with?
		$request = $smcFunc['db_query']('', '
			SELECT id_topic, id_first_msg, id_last_msg
			FROM {db_prefix}topics
			WHERE id_previous_topic = {int:id_previous_topic}
				AND id_board = {int:recycle_board}',
			array(
				'id_previous_topic' => $row['id_topic'],
				'recycle_board' => $modSettings['recycle_board'],
			)
		);
		list ($id_recycle_topic, $first_topic_msg, $last_topic_msg) = $smcFunc['db_fetch_row']($request);
		$smcFunc['db_free_result']($request);

		// Insert a new topic in the recycle board if $id_recycle_topic is empty.
		if (empty($id_recycle_topic))
			$smcFunc['db_insert']('',
				'{db_prefix}topics',
				array(
					'id_board' => 'int', 'id_member_started' => 'int', 'id_member_updated' => 'int', 'id_first_msg' => 'int',
					'id_last_msg' => 'int', 'unapproved_posts' => 'int', 'approved' => 'int', 'id_previous_topic' => 'int',
				),
				array(
					$modSettings['recycle_board'], $row['id_member'], $row['id_member'], $message,
					$message, 0, 1, $row['id_topic'],
				),
				array('id_topic')
			);

		// Capture the ID of the new topic...
		$topicID = empty($id_recycle_topic) ? $smcFunc['db_insert_id']('{db_prefix}topics', 'id_topic') : $id_recycle_topic;

		// If the topic creation went successful, move the message.
		if ($topicID > 0)
		{
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}messages
				SET
					id_topic = {int:id_topic},
					id_board = {int:recycle_board},
					icon = {string:recycled},
					approved = {int:is_approved}
				WHERE id_msg = {int:id_msg}',
				array(
					'id_topic' => $topicID,
					'recycle_board' => $modSettings['recycle_board'],
					'id_msg' => $message,
					'recycled' => 'recycled',
					'is_approved' => 1,
				)
			);

			// Take any reported posts with us...
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}log_reported
				SET
					id_topic = {int:id_topic},
					id_board = {int:recycle_board}
				WHERE id_msg = {int:id_msg}',
				array(
					'id_topic' => $topicID,
					'recycle_board' => $modSettings['recycle_board'],
					'id_msg' => $message,
				)
			);

			// Mark recycled topic as read.
			if (!$user_info['is_guest'])
				$smcFunc['db_insert']('replace',
					'{db_prefix}log_topics',
					array('id_topic' => 'int', 'id_member' => 'int', 'id_msg' => 'int'),
					array($topicID, $user_info['id'], $modSettings['maxMsgID']),
					array('id_topic', 'id_member')
				);

			// Mark recycle board as seen, if it was marked as seen before.
			if (!empty($isRead) && !$user_info['is_guest'])
				$smcFunc['db_insert']('replace',
					'{db_prefix}log_boards',
					array('id_board' => 'int', 'id_member' => 'int', 'id_msg' => 'int'),
					array($modSettings['recycle_board'], $user_info['id'], $modSettings['maxMsgID']),
					array('id_board', 'id_member')
				);

			// Add one topic and post to the recycle bin board.
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}boards
				SET
					num_topics = num_topics + {int:num_topics_inc},
					num_posts = num_posts + 1' .
						($message > $last_board_msg ? ', id_last_msg = {int:id_merged_msg}' : '') . '
				WHERE id_board = {int:recycle_board}',
				array(
					'num_topics_inc' => empty($id_recycle_topic) ? 1 : 0,
					'recycle_board' => $modSettings['recycle_board'],
					'id_merged_msg' => $message,
				)
			);

			// Lets increase the num_replies, and the first/last message ID as appropriate.
			if (!empty($id_recycle_topic))
				$smcFunc['db_query']('', '
					UPDATE {db_prefix}topics
					SET num_replies = num_replies + 1' .
						($message > $last_topic_msg ? ', id_last_msg = {int:id_merged_msg}' : '') .
						($message < $first_topic_msg ? ', id_first_msg = {int:id_merged_msg}' : '') . '
					WHERE id_topic = {int:id_recycle_topic}',
					array(
						'id_recycle_topic' => $id_recycle_topic,
						'id_merged_msg' => $message,
					)
				);

			// Make sure this message isn't getting deleted later on.
			$recycle = true;

			// Make sure we update the search subject index.
			updateStats('subject', $topicID, $row['subject']);
		}

		// If it wasn't approved don't keep it in the queue.
		if (!$row['approved'])
			$smcFunc['db_query']('', '
				DELETE FROM {db_prefix}approval_queue
				WHERE id_msg = {int:id_msg}
					AND id_attach = {int:id_attach}',
				array(
					'id_msg' => $message,
					'id_attach' => 0,
				)
			);
	}

	$smcFunc['db_query']('', '
		UPDATE {db_prefix}boards
		SET ' . ($row['approved'] ? '
			num_posts = CASE WHEN num_posts = {int:no_posts} THEN 0 ELSE num_posts - 1 END' : '
			unapproved_posts = CASE WHEN unapproved_posts = {int:no_unapproved} THEN 0 ELSE unapproved_posts - 1 END') . '
		WHERE id_board = {int:id_board}',
		array(
			'no_posts' => 0,
			'no_unapproved' => 0,
			'id_board' => $row['id_board'],
		)
	);

	// If the poster was registered and the board this message was on incremented
	// the member's posts when it was posted, decrease his or her post count.
	if (!empty($row['id_member']) && $decreasePostCount && empty($row['count_posts']) && $row['approved'])
		updateMemberData($row['id_member'], array('posts' => '-'));

	// Only remove posts if they're not recycled.
	if (!$recycle)
	{
		// Remove the message!
		$smcFunc['db_query']('', '
			DELETE FROM {db_prefix}messages
			WHERE id_msg = {int:id_msg}',
			array(
				'id_msg' => $message,
			)
		);

		if (!empty($modSettings['search_custom_index_config']))
		{
			$customIndexSettings = safe_unserialize($modSettings['search_custom_index_config']);
			$words = text2words($row['body'], $customIndexSettings['bytes_per_word'], true);
			if (!empty($words))
				$smcFunc['db_query']('', '
					DELETE FROM {db_prefix}log_search_words
					WHERE id_word IN ({array_int:word_list})
						AND id_msg = {int:id_msg}',
					array(
						'word_list' => $words,
						'id_msg' => $message,
					)
				);
		}

		// Delete attachment(s) if they exist.
		require_once($sourcedir . '/ManageAttachments.php');
		$attachmentQuery = array(
			'attachment_type' => 0,
			'id_msg' => $message,
		);
		removeAttachments($attachmentQuery);
	}

	// Update the pesky statistics.
	updateStats('message');
	updateStats('topic');
	updateSettings(array(
		'calendar_updated' => time(),
	));

	// And now to update the last message of each board we messed with.
	require_once($sourcedir . '/Subs-Post.php');
	if ($recycle)
		updateLastMessages(array($row['id_board'], $modSettings['recycle_board']));
	else
		updateLastMessages($row['id_board']);

	return false;
}

function RestoreTopic()
{
	global $context, $smcFunc, $modSettings, $sourcedir;

	// Check session.
	checkSession('get');

	// Is recycled board enabled?
	if (empty($modSettings['recycle_enable']))
		fatal_lang_error('restored_disabled', 'critical');

	// Can we be in here?
	isAllowedTo('move_any', $modSettings['recycle_board']);

	// We need this file.
	require_once($sourcedir . '/MoveTopic.php');

	$unfound_messages = array();
	$topics_to_restore = array();

	// Restoring messages?
	if (!empty($_REQUEST['msgs']))
	{
		$msgs = explode(',', $_REQUEST['msgs']);
		foreach ($msgs as $k => $msg)
			$msgs[$k] = (int) $msg;

		// Get the id_previous_board and id_previous_topic.
		$request = $smcFunc['db_query']('', '
			SELECT m.id_topic, m.id_msg, m.id_board, m.subject, m.id_member, t.id_previous_board, t.id_previous_topic,
				t.id_first_msg, b.count_posts, IFNULL(pt.id_board, 0) AS possible_prev_board
			FROM {db_prefix}messages AS m
				INNER JOIN {db_prefix}topics AS t ON (t.id_topic = m.id_topic)
				INNER JOIN {db_prefix}boards AS b ON (b.id_board = m.id_board)
				LEFT JOIN {db_prefix}topics AS pt ON (pt.id_topic = t.id_previous_topic)
			WHERE m.id_msg IN ({array_int:messages})',
			array(
				'messages' => $msgs,
			)
		);

		$actioned_messages = array();
		$previous_topics = array();
		while ($row = $smcFunc['db_fetch_assoc']($request))
		{
			// Restoring the first post means topic.
			if ($row['id_msg'] == $row['id_first_msg'] && $row['id_previous_topic'] == $row['id_topic'])
			{
				$topics_to_restore[] = $row['id_topic'];
				continue;
			}
			// Don't know where it's going?
			if (empty($row['id_previous_topic']))
			{
				$unfound_messages[$row['id_msg']] = $row['subject'];
				continue;
			}

			$previous_topics[] = $row['id_previous_topic'];
			if (empty($actioned_messages[$row['id_previous_topic']]))
				$actioned_messages[$row['id_previous_topic']] = array(
					'msgs' => array(),
					'count_posts' => $row['count_posts'],
					'subject' => $row['subject'],
					'previous_board' => $row['id_previous_board'],
					'possible_prev_board' => $row['possible_prev_board'],
					'current_topic' => $row['id_topic'],
					'current_board' => $row['id_board'],
					'members' => array(),
				);

			$actioned_messages[$row['id_previous_topic']]['msgs'][$row['id_msg']] = $row['subject'];
			if ($row['id_member'])
				$actioned_messages[$row['id_previous_topic']]['members'][] = $row['id_member'];
		}
		$smcFunc['db_free_result']($request);

		// Check for topics we are going to fully restore.
		foreach ($actioned_messages as $topic => $data)
			if (in_array($topic, $topics_to_restore))
				unset($actioned_messages[$topic]);

		// Load any previous topics to check they exist.
		if (!empty($previous_topics))
		{
			$request = $smcFunc['db_query']('', '
				SELECT t.id_topic, t.id_board, m.subject
				FROM {db_prefix}topics AS t
					INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
				WHERE t.id_topic IN ({array_int:previous_topics})',
				array(
					'previous_topics' => $previous_topics,
				)
			);
			$previous_topics = array();
			while ($row = $smcFunc['db_fetch_assoc']($request))
				$previous_topics[$row['id_topic']] = array(
					'board' => $row['id_board'],
					'subject' => $row['subject'],
				);
			$smcFunc['db_free_result']($request);
		}

		// Restore each topic.
		$messages = array();
		foreach ($actioned_messages as $topic => $data)
		{
			// If we have topics we are going to restore the whole lot ignore them.
			if (in_array($topic, $topics_to_restore))
			{
				unset($actioned_messages[$topic]);
				continue;
			}

			// Move the posts back then!
			if (isset($previous_topics[$topic]))
			{
				mergePosts(array_keys($data['msgs']), $data['current_topic'], $topic);
				// Log em.
				logAction('restore_posts', array('topic' => $topic, 'subject' => $previous_topics[$topic]['subject'], 'board' => empty($data['previous_board']) ? $data['possible_prev_board'] : $data['previous_board']));
				$messages = array_merge(array_keys($data['msgs']), $messages);
			}
			else
			{
				foreach ($data['msgs'] as $msg)
					$unfound_messages[$msg['id']] = $msg['subject'];
			}
		}

		// Put the icons back.
		if (!empty($messages))
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}messages
				SET icon = {string:icon}
				WHERE id_msg IN ({array_int:messages})',
				array(
					'icon' => 'xx',
					'messages' => $messages,
				)
			);
	}

	// Now any topics?
	if (!empty($_REQUEST['topics']))
	{
		$topics = explode(',', $_REQUEST['topics']);
		foreach ($topics as $key => $id)
			$topics_to_restore[] = (int) $id;
	}

	if (!empty($topics_to_restore))
	{
		// Lets get the data for these topics.
		$request = $smcFunc['db_query']('', '
			SELECT t.id_topic, t.id_previous_board, t.id_board, t.id_first_msg, m.subject
			FROM {db_prefix}topics AS t
				INNER JOIN {db_prefix}messages AS m ON (m.id_msg = t.id_first_msg)
			WHERE t.id_topic IN ({array_int:topics})',
			array(
				'topics' => $topics_to_restore,
			)
		);
		while ($row = $smcFunc['db_fetch_assoc']($request))
		{
			// We can only restore if the previous board is set.
			if (empty($row['id_previous_board']))
			{
				$unfound_messages[$row['id_first_msg']] = $row['subject'];
				continue;
			}

			// Ok we got here so me move them from here to there.
			moveTopics($row['id_topic'], $row['id_previous_board']);

			// Lets remove the recycled icon.
			$smcFunc['db_query']('', '
				UPDATE {db_prefix}messages
				SET icon = {string:icon}
				WHERE id_topic = {int:id_topic}',
				array(
					'icon' => 'xx',
					'id_topic' => $row['id_topic'],
				)
			);

			// Lets see if the board that we are returning to has post count enabled.
			$request2 = $smcFunc['db_query']('', '
				SELECT count_posts
				FROM {db_prefix}boards
				WHERE id_board = {int:board}',
				array(
					'board' => $row['id_previous_board'],
				)
			);
			list ($count_posts) = $smcFunc['db_fetch_row']($request2);
			$smcFunc['db_free_result']($request2);

			if (empty($count_posts))
			{
				// Lets get the members that need their post count restored.
				$request2 = $smcFunc['db_query']('', '
					SELECT id_member, COUNT(id_msg) AS post_count
					FROM {db_prefix}messages
					WHERE id_topic = {int:topic}
						AND approved = {int:is_approved}
					GROUP BY id_member',
					array(
						'topic' => $row['id_topic'],
						'is_approved' => 1,
					)
				);

				while ($member = $smcFunc['db_fetch_assoc']($request2))
					updateMemberData($member['id_member'], array('posts' => 'posts + ' . $member['post_count']));
				$smcFunc['db_free_result']($request2);
			}

			// Log it.
			logAction('restore_topic', array('topic' => $row['id_topic'], 'board' => $row['id_board'], 'board_to' => $row['id_previous_board']));
		}
		$smcFunc['db_free_result']($request);
	}

	// Didn't find some things?
	if (!empty($unfound_messages))
		fatal_lang_error('restore_not_found', false, array(implode('<br />', $unfound_messages)));

	// Just send them to the index if they get here.
	redirectexit();
}

// Take a load of messages from one place and stick them in a topic.
function mergePosts($msgs = array(), $from_topic, $target_topic)
{
	global $context, $smcFunc, $modSettings, $sourcedir;

	//!!! This really needs to be rewritten to take a load of messages from ANY topic, it's also inefficient.

	// Is it an array?
	if (!is_array($msgs))
		$msgs = array($msgs);

	// Lets make sure they are int.
	foreach ($msgs as $key => $msg)
		$msgs[$key] = (int) $msg;

	// Get the source information.
	$request = $smcFunc['db_query']('', '
		SELECT t.id_board, t.id_first_msg, t.num_replies, t.unapproved_posts
		FROM {db_prefix}topics AS t
			INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
		WHERE t.id_topic = {int:from_topic}',
		array(
			'from_topic' => $from_topic,
		)
	);
	list ($from_board, $from_first_msg, $from_replies, $from_unapproved_posts) = $smcFunc['db_fetch_row']($request);
	$smcFunc['db_free_result']($request);

	// Get some target topic and board stats.
	$request = $smcFunc['db_query']('', '
		SELECT t.id_board, t.id_first_msg, t.num_replies, t.unapproved_posts, b.count_posts
		FROM {db_prefix}topics AS t
			INNER JOIN {db_prefix}boards AS b ON (b.id_board = t.id_board)
		WHERE t.id_topic = {int:target_topic}',
		array(
			'target_topic' => $target_topic,
		)
	);
	list ($target_board, $target_first_msg, $target_replies, $target_unapproved_posts, $count_posts) = $smcFunc['db_fetch_row']($request);
	$smcFunc['db_free_result']($request);

	// Lets see if the board that we are returning to has post count enabled.
	if (empty($count_posts))
	{
		// Lets get the members that need their post count restored.
		$request = $smcFunc['db_query']('', '
			SELECT id_member
			FROM {db_prefix}messages
			WHERE id_msg IN ({array_int:messages})
				AND approved = {int:is_approved}',
			array(
				'messages' => $msgs,
				'is_approved' => 1,
			)
		);

		while ($row = $smcFunc['db_fetch_assoc']($request))
			updateMemberData($row['id_member'], array('posts' => '+'));
	}

	// Time to move the messages.
	$smcFunc['db_query']('', '
		UPDATE {db_prefix}messages
		SET
			id_topic = {int:target_topic},
			id_board = {int:target_board},
			icon = {string:icon}
		WHERE id_msg IN({array_int:msgs})',
		array(
			'target_topic' => $target_topic,
			'target_board' => $target_board,
			'icon' => $target_board == $modSettings['recycle_board'] ? 'recycled' : 'xx',
			'msgs' => $msgs,
		)
	);

	// Fix the id_first_msg and id_last_msg for the target topic.
	$target_topic_data = array(
		'num_replies' => 0,
		'unapproved_posts' => 0,
		'id_first_msg' => 9999999999,
	);
	$request = $smcFunc['db_query']('', '
		SELECT MIN(id_msg) AS id_first_msg, MAX(id_msg) AS id_last_msg, COUNT(*) AS message_count, approved
		FROM {db_prefix}messages
		WHERE id_topic = {int:target_topic}
		GROUP BY id_topic, approved
		ORDER BY approved ASC
		LIMIT 2',
		array(
			'target_topic' => $target_topic,
		)
	);
	while ($row = $smcFunc['db_fetch_assoc']($request))
	{
		if ($row['id_first_msg'] < $target_topic_data['id_first_msg'])
			$target_topic_data['id_first_msg'] = $row['id_first_msg'];
		$target_topic_data['id_last_msg'] = $row['id_last_msg'];
		if (!$row['approved'])
			$target_topic_data['unapproved_posts'] = $row['message_count'];
		else
			$target_topic_data['num_replies'] = max(0, $row['message_count'] - 1);
	}
	$smcFunc['db_free_result']($request);

	// We have a new post count for the board.
	$smcFunc['db_query']('', '
		UPDATE {db_prefix}boards
		SET
			num_posts = num_posts + {int:diff_replies},
			unapproved_posts = unapproved_posts + {int:diff_unapproved_posts}
		WHERE id_board = {int:target_board}',
		array(
			'diff_replies' => $target_topic_data['num_replies'] - $target_replies, // Lets keep in mind that the first message in a topic counts towards num_replies in a board.
			'diff_unapproved_posts' => $target_topic_data['unapproved_posts'] - $target_unapproved_posts,
			'target_board' => $target_board,
		)
	);

	// In some cases we merged the only post in a topic so the topic data is left behind in the topic table.
	$request = $smcFunc['db_query']('', '
		SELECT id_topic
		FROM {db_prefix}messages
		WHERE id_topic = {int:from_topic}',
		array(
			'from_topic' => $from_topic,
		)
	);

	// Remove the topic if it doesn't have any messages.
	$topic_exists = true;
	if ($smcFunc['db_num_rows']($request) == 0)
	{
		removeTopics($from_topic, false, true);
		$topic_exists = false;
	}
	$smcFunc['db_free_result']($request);

	// Recycled topic.
	if ($topic_exists == true)
	{
		// Fix the id_first_msg and id_last_msg for the source topic.
		$source_topic_data = array(
			'num_replies' => 0,
			'unapproved_posts' => 0,
			'id_first_msg' => 9999999999,
		);
		$request = $smcFunc['db_query']('', '
			SELECT MIN(id_msg) AS id_first_msg, MAX(id_msg) AS id_last_msg, COUNT(*) AS message_count, approved, subject
			FROM {db_prefix}messages
			WHERE id_topic = {int:from_topic}
			GROUP BY id_topic, approved
			ORDER BY approved ASC
			LIMIT 2',
			array(
				'from_topic' => $from_topic,
			)
		);
		while ($row = $smcFunc['db_fetch_assoc']($request))
		{
			if ($row['id_first_msg'] < $source_topic_data['id_first_msg'])
				$source_topic_data['id_first_msg'] = $row['id_first_msg'];
			$source_topic_data['id_last_msg'] = $row['id_last_msg'];
			if (!$row['approved'])
				$source_topic_data['unapproved_posts'] = $row['message_count'];
			else
				$source_topic_data['num_replies'] = max(0, $row['message_count'] - 1);
		}
		$smcFunc['db_free_result']($request);

		// Update the topic details for the source topic.
		$smcFunc['db_query']('', '
			UPDATE {db_prefix}topics
			SET
				id_first_msg = {int:id_first_msg},
				id_last_msg = {int:id_last_msg},
				num_replies = {int:num_replies},
				unapproved_posts = {int:unapproved_posts}
			WHERE id_topic = {int:from_topic}',
			array(
				'id_first_msg' => $source_topic_data['id_first_msg'],
				'id_last_msg' => $source_topic_data['id_last_msg'],
				'num_replies' => $source_topic_data['num_replies'],
				'unapproved_posts' => $source_topic_data['unapproved_posts'],
				'from_topic' => $from_topic,
			)
		);

		// We have a new post count for the source board.
		$smcFunc['db_query']('', '
			UPDATE {db_prefix}boards
			SET
				num_posts = num_posts + {int:diff_replies},
				unapproved_posts = unapproved_posts + {int:diff_unapproved_posts}
			WHERE id_board = {int:from_board}',
			array(
				'diff_replies' => $source_topic_data['num_replies'] - $from_replies, // Lets keep in mind that the first message in a topic counts towards num_replies in a board.
				'diff_unapproved_posts' => $source_topic_data['unapproved_posts'] - $from_unapproved_posts,
				'from_board' => $from_board,
			)
		);
	}

	// Finally get around to updating the destination topic, now all indexes etc on the source are fixed.
	$smcFunc['db_query']('', '
		UPDATE {db_prefix}topics
		SET
			id_first_msg = {int:id_first_msg},
			id_last_msg = {int:id_last_msg},
			num_replies = {int:num_replies},
			unapproved_posts = {int:unapproved_posts}
		WHERE id_topic = {int:target_topic}',
		array(
			'id_first_msg' => $target_topic_data['id_first_msg'],
			'id_last_msg' => $target_topic_data['id_last_msg'],
			'num_replies' => $target_topic_data['num_replies'],
			'unapproved_posts' => $target_topic_data['unapproved_posts'],
			'target_topic' => $target_topic,
		)
	);

	// Need it to update some stats.
	require_once($sourcedir . '/Subs-Post.php');

	// Update stats.
	updateStats('topic');
	updateStats('message');

	// Subject cache?
	$cache_updates = array();
	if ($target_first_msg != $target_topic_data['id_first_msg'])
		$cache_updates[] = $target_topic_data['id_first_msg'];
	if (!empty($source_topic_data['id_first_msg']) && $from_first_msg != $source_topic_data['id_first_msg'])
		$cache_updates[] = $source_topic_data['id_first_msg'];

	if (!empty($cache_updates))
	{
		$request = $smcFunc['db_query']('', '
			SELECT id_topic, subject
			FROM {db_prefix}messages
			WHERE id_msg IN ({array_int:first_messages})',
			array(
				'first_messages' => $cache_updates,
			)
		);
		while ($row = $smcFunc['db_fetch_assoc']($request))
			updateStats('subject', $row['id_topic'], $row['subject']);
		$smcFunc['db_free_result']($request);
	}

	updateLastMessages(array($from_board, $target_board));
}

?>