Gazelle/sections/torrents/merge.php

<?
if(!check_perms('torrents_edit')) { error(403); }

$GroupID = $_POST['groupid'];
$OldGroupID = $GroupID;
$NewGroupID = db_string($_POST['targetgroupid']);

if(!$GroupID || !is_number($GroupID)) { error(404); }
if(!$NewGroupID || !is_number($NewGroupID)) { error(404); }
if($NewGroupID == $GroupID) {
	error('Old group ID is the same as new group ID!');
}
$DB->query("SELECT CategoryID, Name FROM torrents_group WHERE ID='$NewGroupID'");
if($DB->record_count()==0) {
	error('Target group does not exist.');
}
list($CategoryID, $NewName) = $DB->next_record();
if($Categories[$CategoryID-1] != 'Music') {
	error('Only music groups can be merged.');
}

$DB->query("SELECT Name FROM torrents_group WHERE ID = ".$GroupID);
list($Name) = $DB->next_record();

//Everything is legit, let's just confim they're not retarded
if(empty($_POST['confirm'])) {
	$Artists = Artists::get_artists(array($GroupID, $NewGroupID));

	View::show_header();
?>
	<div class="center thin">
	<div class="header">
		<h2>Merge Confirm!</h2>
	</div>
	<div class="box pad">
		<form class="confirm_form" name="torrent_group" action="torrents.php" method="post">
			<input type="hidden" name="action" value="merge" />
			<input type="hidden" name="auth" value="<?=$LoggedUser['AuthKey']?>" />
			<input type="hidden" name="confirm" value="true" />
			<input type="hidden" name="groupid" value="<?=$GroupID?>" />
			<input type="hidden" name="targetgroupid" value="<?=$NewGroupID?>" />
			<h3>You are attempting to merge the group:</h3>
			<ul><li><?= Artists::display_artists($Artists[$GroupID], true, false)?> - <a href="torrents.php?id=<?=$GroupID?>"><?=$Name?></a></li></ul>
			<h3>Into the group:</h3>
			<ul><li><?= Artists::display_artists($Artists[$NewGroupID], true, false)?> - <a href="torrents.php?id=<?=$NewGroupID?>"><?=$NewName?></a></li></ul>
			<input type="submit" value="Confirm" />
		</form>
	</div>
	</div>
<?
	View::show_footer();
} else {
	authorize();

	// Votes ninjutsu. This is so annoyingly complicated.
	// 1. Get a list of everybody who voted on the old group and clear their cache keys
	$DB->query("SELECT UserID FROM users_votes WHERE GroupID='$GroupID'");
	while (list($UserID) = $DB->next_record()) {
		$Cache->delete_value('voted_albums_'.$UserID);
	}
	// 2. Update the existing votes where possible, clear out the duplicates left by key
	// conflicts, and update the torrents_votes table
	$DB->query("UPDATE IGNORE users_votes SET GroupID='$NewGroupID' WHERE GroupID='$GroupID'");
	$DB->query("DELETE FROM users_votes WHERE GroupID='$GroupID'");
	$DB->query("INSERT INTO torrents_votes (GroupID, Ups, Total, Score)
				SELECT $NewGroupID, UpVotes, TotalVotes, VoteScore
				FROM (SELECT IFNULL(SUM(IF(Type='Up',1,0)),0) As UpVotes,
							 COUNT(1) AS TotalVotes,
							 binomial_ci(IFNULL(SUM(IF(Type='Up',1,0)),0), COUNT(1)) AS VoteScore
						FROM users_votes
						WHERE GroupID = $NewGroupID
						GROUP BY GroupID) AS a
				ON DUPLICATE KEY UPDATE
				Ups = a.UpVotes,
				Total = a.TotalVotes,
				Score = a.VoteScore;");
	// 3. Clear the votes_pairs keys!
	$DB->query("SELECT v2.GroupID
				FROM users_votes AS v1
				INNER JOIN users_votes AS v2 USING (UserID)
				WHERE (v1.Type = 'Up' OR v2.Type='Up')
				AND (v1.GroupID IN($GroupID, $NewGroupID))
				AND (v2.GroupID NOT IN($GroupID, $NewGroupID));");
	while (list($CacheGroupID) = $DB->next_record()) {
		$Cache->delete_value('vote_pairs_'.$CacheGroupID);
	}
	// 4. Clear the new groups vote keys
	$Cache->delete_value('votes_'.$NewGroupID);

	$DB->query("UPDATE torrents SET GroupID='$NewGroupID' WHERE GroupID='$GroupID'");
	$DB->query("UPDATE wiki_torrents SET PageID='$NewGroupID' WHERE PageID='$GroupID'");
	$DB->query("UPDATE torrents_comments SET GroupID='$NewGroupID' WHERE GroupID='$GroupID'");

	Torrents::delete_group($GroupID);

	Torrents::write_group_log($NewGroupID, 0, $LoggedUser['ID'], "Merged Group ".$GroupID." (".$Name.") to ".$NewGroupID." (".$NewName.")", 0);
	$DB->query("UPDATE group_log SET GroupID = ".$NewGroupID." WHERE GroupID = ".$GroupID);

	$GroupID=$NewGroupID;

	//Collages
	$DB->query("SELECT CollageID FROM collages_torrents WHERE GroupID='$OldGroupID'"); //Select all collages that contain edited group
	while(list($CollageID) = $DB->next_record()) {
		$DB->query("UPDATE IGNORE collages_torrents SET GroupID='$NewGroupID' WHERE GroupID='$OldGroupID' AND CollageID='$CollageID'"); //Change collage groupid to new ID
		$DB->query("DELETE FROM collages_torrents WHERE GroupID='$OldGroupID' AND CollageID='$CollageID'");
		$Cache->delete_value('collage_'.$CollageID);
	}

	//Requests
	$DB->query("SELECT ID FROM requests WHERE GroupID='$OldGroupID'");
	$Requests = $DB->collect('ID');
	$DB->query("UPDATE requests SET GroupID = 'NewGroupID' WHERE GroupID = '$OldGroupID'");
	foreach ($Requests as $RequestID) {
		$Cache->delete_value('request_'.$RequestID);
	}

	$DB->query("SELECT ID FROM torrents WHERE GroupID='$OldGroupID'");
	while(list($TorrentID) = $DB->next_record()) {
		$Cache->delete_value('torrent_download_'.$TorrentID);
	}
	$Cache->delete_value('torrents_details_'.$GroupID);
	$Cache->delete_value('torrent_comments_'.$GroupID.'_catalogue_0');
	$Cache->delete_value('torrent_comments_'.$GroupID);
	$Cache->delete_value('groups_artists_'.$GroupID);
	Torrents::update_hash($GroupID);

	header('Location: torrents.php?id='.$GroupID);
}
?>