<?
/****************************************************************
 *--------------[  Rename artist  ]-----------------------------*
 * This page handles the backend of the 'rename artist'		*
 * feature. It is quite resource intensive, which is okay	*
 * since it's rarely used. 					*
 * 								*
 * If there is no artist with the target name, it simply 	*
 * renames the artist. However, if there is an artist with the	*
 * target name, things gut funky - the artists must be merged,	*
 * along with their torrents. 					*
 * 								*
 * In the event of a merger, the description of THE TARGET 	*
 * ARTIST will be used as the description of the final result. 	*
 * The same applies for torrents. 				*
 * 								*
 * Tags are not merged along with the torrents. 		*
 * Neither are similar artists. 				*
 *								*
 * We can add these features eventually. 			*
 ****************************************************************/

authorize();

$ArtistID = $_POST['artistid'];
$NewName = $_POST['name'];

if(!$ArtistID || !is_number($ArtistID)) { error(404); }

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

$DB->query("SELECT Name FROM artists_group WHERE ArtistID='$ArtistID'");
if($DB->record_count()==0) { error(404); }
list($OldName) = $DB->next_record(MYSQLI_NUM, false);
if($OldName == $NewName) { error('The new name is identical to the old name.'); }

$DB->query("SELECT AliasID FROM artists_alias WHERE Name='".db_string($OldName)."' AND ArtistID='$ArtistID'");
list($OldAliasID) = $DB->next_record(MYSQLI_NUM, false);
if(!$OldAliasID) { error('Could not find old alias ID'); }

$DB->query("SELECT AliasID, ArtistID FROM artists_alias WHERE name LIKE '".db_string($NewName, true)."'");
list($TargetAliasID, $TargetArtistID) = $DB->next_record(MYSQLI_NUM, false);

if(!$TargetAliasID || $TargetAliasID==$OldAliasID) {
	// no merge, just rename
	$DB->query("INSERT INTO artists_alias (ArtistID, Name, Redirect, UserID) VALUES ($ArtistID, '".db_string($NewName)."', '0', '$LoggedUser[ID]')");
	$TargetAliasID = $DB->inserted_id();

	$DB->query("UPDATE artists_alias SET Redirect='$TargetAliasID' WHERE AliasID='$OldAliasID'");
	$DB->query("UPDATE artists_group SET Name='".db_string($NewName)."' WHERE ArtistID='$ArtistID'");
	$DB->query("SELECT GroupID FROM torrents_artists WHERE AliasID='$OldAliasID'");
	$Groups = $DB->collect('GroupID');
	$DB->query("UPDATE IGNORE torrents_artists SET AliasID='$TargetAliasID' WHERE AliasID='$OldAliasID'");
	$DB->query("DELETE FROM torrents_artists WHERE AliasID='$OldAliasID'");
	
	if(!empty($Groups)) {
		foreach($Groups as $GroupID) {
			$Cache->delete_value('groups_artists_'.$GroupID); // Delete group artist cache
			update_hash($GroupID);
		}
	}
	
	$TargetArtistID = $ArtistID;

} else {	// Merge stuff
	$DB->query("UPDATE artists_alias SET Redirect='$TargetAliasID',ArtistID='$TargetArtistID' WHERE AliasID='$OldAliasID'");
	$DB->query("UPDATE artists_alias SET Redirect='0' WHERE AliasID='$TargetAliasID'");
	if($ArtistID != $TargetArtistID) {
		$DB->query("UPDATE artists_alias SET ArtistID='$TargetArtistID' WHERE ArtistID='$ArtistID'");
		$DB->query("DELETE FROM artists_group WHERE ArtistID='$ArtistID'");
	} else {
		$DB->query("UPDATE artists_group SET Name='".db_string($NewName)."' WHERE ArtistID='$ArtistID'");
	}
	
	$DB->query("SELECT GroupID FROM torrents_artists WHERE AliasID='$OldAliasID'");
	$Groups = $DB->collect('GroupID');
	
	$DB->query("UPDATE IGNORE torrents_artists SET AliasID='$TargetAliasID',ArtistID='$TargetArtistID' WHERE AliasID='$OldAliasID'");
	$DB->query("DELETE FROM torrents_artists WHERE AliasID='$OldAliasID'");
	
	if(!empty($Groups)) {
		foreach($Groups as $GroupID) {
			$Cache->delete_value('groups_artists_'.$GroupID);
			update_hash($GroupID);
		}
	}
	if($ArtistID != $TargetArtistID) {
		$DB->query("SELECT GroupID FROM torrents_artists WHERE ArtistID='$ArtistID'");
		$Groups = $DB->collect('GroupID');
		
		$DB->query("UPDATE IGNORE torrents_artists SET ArtistID='$TargetArtistID' WHERE ArtistID='$ArtistID'");
		$DB->query("DELETE FROM torrents_artists WHERE ArtistID='$ArtistID'");
	
		if(!empty($Groups)) {
			foreach($Groups as $GroupID) {
				$Cache->delete_value('groups_artists_'.$GroupID);
				update_hash($GroupID);
			}
		}
	}
	
}

$Cache->delete_value('artist_'.$ArtistID);

// Clear torrent caches
$DB->query("SELECT GroupID FROM torrents_artists WHERE ArtistID='$ArtistID'");
while(list($GroupID) = $DB->next_record()) {
	$Cache->delete_value('torrents_details_'.$GroupID);
}

$Cache->delete_value('artist_'.$ArtistID);
$Cache->delete_value('artist_'.$TargetArtistID);

header('Location: artist.php?id='.$TargetArtistID);

?>