harmonia/Harmonia.Core/Playlists/PlaylistRepository.cs

using Harmonia.Core.Data;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Harmonia.Core.Playlists;

public class PlaylistRepository : JsonFileRepository<Playlist>, IPlaylistRepository
{
    private static readonly JsonSerializerOptions _options = new()
    {
        WriteIndented = true,
        IgnoreReadOnlyProperties = true,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
    };

    protected override string DirectoryName => Path.Combine("Playlists");

    protected override async Task<Playlist> DeserializeAsync(Stream stream)
    {
        PlaylistDto dto = await JsonSerializer.DeserializeAsync<PlaylistDto>(stream, _options) ?? new();

        return dto.ToPlaylist();
    }

    protected override Task<string> SerializeAsync(Playlist playlist)
    {
        PlaylistDto dto = PlaylistDto.FromPlaylist(playlist);

        return Task.FromResult(JsonSerializer.Serialize(dto, _options));
    }

    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");
    }
}