public IActionResult UpdateSong(Guid playlistId, Guid songId,
                                        [FromBody] MoveSongInPlaylist moveSongInPlaylist)
        {
            if (moveSongInPlaylist == null)
            {
                return(BadRequest());
            }

            if (!ModelState.IsValid)
            {
                return(new UnprocessableEntityObjectResult(ModelState));
            }

            if (!_sprotifyRepository.PlaylistExists(playlistId))
            {
                return(NotFound());
            }

            var song = _sprotifyRepository.GetSongFromPlaylist(playlistId, songId);

            if (song == null)
            {
                return(NotFound());
            }

            if (moveSongInPlaylist.OldIndex == moveSongInPlaylist.NewIndex)
            {
                return(NoContent());
            }

            _sprotifyRepository.UpdateSongInPlaylist(playlistId, songId, moveSongInPlaylist.OldIndex, moveSongInPlaylist.NewIndex);

            if (!_sprotifyRepository.Save())
            {
                throw new Exception($"Updating song {songId} from playlist {playlistId} failed.");
            }

            return(NoContent());
        }