<?php
/****************************************************************
 *--------------[  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'];
$NewName = Artists::normalise_artist_name($_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 (!$DB->has_results()) {
	error(404);
}
list($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
			Torrents::update_hash($GroupID);
		}
	}

	$DB->query("
		SELECT RequestID
		FROM requests_artists
		WHERE AliasID = '$OldAliasID'");
	$Requests = $DB->collect('RequestID');
	$DB->query("
		UPDATE IGNORE requests_artists
		SET AliasID = '$TargetAliasID'
		WHERE AliasID = '$OldAliasID'");
	$DB->query("
		DELETE FROM requests_artists
		WHERE AliasID = '$OldAliasID'");
	if (!empty($Requests)) {
		foreach ($Requests as $RequestID) {
			$Cache->delete_value("request_artists_$RequestID"); // Delete request artist cache
			Requests::update_sphinx_requests($RequestID);
		}
	}
	$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");
			Torrents::update_hash($GroupID);
		}
	}

	$DB->query("
		SELECT RequestID
		FROM requests_artists
		WHERE AliasID = '$OldAliasID'");
	$Requests = $DB->collect('RequestID');
	$DB->query("
		UPDATE IGNORE requests_artists
		SET AliasID = '$TargetAliasID', ArtistID = '$TargetArtistID'
		WHERE AliasID = '$OldAliasID'");
	$DB->query("
		DELETE FROM requests_artists
		WHERE AliasID = '$OldAliasID'");
	if (!empty($Requests)) {
		foreach ($Requests as $RequestID) {
			$Cache->delete_value("request_artists_$RequestID");
			Requests::update_sphinx_requests($RequestID);
		}
	}

	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");
				Torrents::update_hash($GroupID);
			}
		}

		$DB->query("
			SELECT RequestID
			FROM requests_artists
			WHERE ArtistID = '$ArtistID'");
		$Requests = $DB->collect('RequestID');
		$DB->query("
			UPDATE IGNORE requests_artists
			SET ArtistID = '$TargetArtistID'
			WHERE ArtistID = '$ArtistID'");
		$DB->query("
			DELETE FROM requests_artists
			WHERE ArtistID = '$ArtistID'");
		if (!empty($Requests)) {
			foreach ($Requests as $RequestID) {
				$Cache->delete_value("request_artists_$RequestID");
				Requests::update_sphinx_requests($RequestID);
			}
		}
	}
}

// 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");
$Cache->delete_value("artists_requests_$TargetArtistID");
$Cache->delete_value("artists_requests_$ArtistID");

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

?>