<?
authorize();
if (!check_perms('site_torrents_notify')) {
	error(403);
}
$ArtistID = $_GET['artistid'];
if (!is_number($ArtistID)) {
	error(0);
}

$DB->query("SELECT GROUP_CONCAT(Name SEPARATOR '|') FROM artists_alias WHERE ArtistID = '$ArtistID' AND Redirect = 0 GROUP BY ArtistID");
list($ArtistAliases) = $DB->next_record(MYSQLI_NUM, FALSE);

$Notify = $Cache->get_value('notify_artists_'.$LoggedUser['ID']);
if (empty($Notify)) {
	$DB->query("SELECT ID, Artists FROM users_notify_filters WHERE Label='Artist notifications' AND UserID='$LoggedUser[ID]' ORDER BY ID LIMIT 1");
} else {
	$DB->query("SELECT ID, Artists FROM users_notify_filters WHERE ID='$Notify[ID]'");
}
if (empty($Notify) && $DB->record_count() == 0) {
	$DB->query("INSERT INTO users_notify_filters (UserID, Label, Artists) VALUES ('$LoggedUser[ID]', 'Artist notifications', '|".db_string($ArtistAliases)."|')");
	$FilterID = $DB->inserted_id();
	$Cache->delete_value('notify_filters_'.$LoggedUser['ID']);
	$Cache->delete_value('notify_artists_'.$LoggedUser['ID']);
} else {
	list($ID, $ArtistNames) = $DB->next_record(MYSQLI_NUM, FALSE);
	if (stripos($ArtistNames,$ArtistAliases) === false) {
		$ArtistNames.=$ArtistAliases.'|';
		$DB->query("UPDATE users_notify_filters SET Artists='".db_string($ArtistNames)."' WHERE ID='$ID'");
		$Cache->delete_value('notify_filters_'.$LoggedUser['ID']);
		$Cache->delete_value('notify_artists_'.$LoggedUser['ID']);
	}
}
header('Location: '.$_SERVER['HTTP_REFERER']);
?>