harmonia/Harmonia.Core/Playlists/PlaylistRepository.cs

using Harmonia.Core.Data;

namespace Harmonia.Core.Playlists;

public class PlaylistRepository : JsonFileRepository<Playlist>, IPlaylistRepository
{
    protected override string DirectoryName => string.Empty;

    public Playlist? GetPlaylist(PlaylistSong playlistSong)
    {
        return Get().FirstOrDefault(playlist => playlist.Songs.Contains(playlistSong));
    }

    protected override string GetNewFileName()
    {
        for (int i = 0; i < 1000; i++)
        {
            string shortFileName = $"Playlist{i.ToString().PadLeft(3, '0')}.{Extension}";
            string filePath = Path.Combine(DirectoryName, shortFileName);

            if (File.Exists(filePath) == false)
                return shortFileName;
        }

        throw new Exception("Unable to determine new fileName");
    }
}