public function get_fileCities()
    {
        $filePath = __DIR__ . '/../../cities.txt';
        if (!file_exists($filePath)) {
            file_put_contents($filePath, '');
        }
        $data = file_get_contents($filePath);
        header('Content-Type: application/json');
        if ($data) {
            echo json_encode(explode(',', $data));
        } else {
            echo json_encode([]);
        }
    }

    public function get_updateFileCities()
    {
        $filePath = __DIR__ . '/../../cities.txt';
        if (isset($_GET['cityIds'])) {
            $cityIds = $_GET['cityIds'];

            file_put_contents($filePath, $cityIds);

            header('Content-Type: application/json');
            echo json_encode(['status' => 'success']);
        } else {
            header('Content-Type: application/json');
            echo json_encode(['status' => 'error', 'message' => 'No city IDs provided']);
        }
    }