using VideoDownloader.App.Browser.Features;

namespace VideoDownloader.Tests.Browser;

// ── T2-10 미디어 재생목록 (Brave Playlist 패턴): 감지된 미디어를 쌓고 재생/제거/영속 ──
public class MediaPlaylistTests : IDisposable
{
    private readonly string _path = Path.Combine(Path.GetTempPath(), $"playlist_{Guid.NewGuid():N}.json");
    private readonly MediaPlaylist _pl = new();

    private MediaTrack Mk(string url = "https://v.test/a.mp4", string title = "트랙A", string kind = "Direct")
        => new(url, title, kind, AddedAt: DateTime.UtcNow);

    [Fact]
    public void Add는_재생목록_끝에_추가하고_중복_URL은_무시한다()
    {
        var t = Mk();
        _pl.Add(t);
        _pl.Add(Mk(url: "https://v.test/b.mp4", title: "트랙B"));
        _pl.Add(Mk()); // 동일 URL 중복
        Assert.Equal(2, _pl.Tracks.Count);
        Assert.Equal("트랙A", _pl.Tracks[0].Title);
    }

    [Fact]
    public void Remove와_Clear()
    {
        var a = Mk(); var b = Mk("https://v.test/b.mp4", "B");
        _pl.Add(a); _pl.Add(b);
        _pl.Remove(a);
        Assert.Single(_pl.Tracks);
        _pl.Clear();
        Assert.Empty(_pl.Tracks);
    }

    [Fact]
    public void 다음_이전_트랙은_순환한다()
    {
        _pl.Add(Mk("u1", "1"));
        _pl.Add(Mk("u2", "2"));
        _pl.Add(Mk("u3", "3"));
        _pl.CurrentIndex = 0;

        Assert.Equal(1, _pl.Next());
        Assert.Equal(2, _pl.Next());
        Assert.Equal(0, _pl.Next()); // 순환
        Assert.Equal(2, _pl.Previous());
    }

    [Fact]
    public void 현재_트랙은_CurrentIndex로_얻는다()
    {
        _pl.Add(Mk("u1", "1"));
        _pl.Add(Mk("u2", "2"));
        _pl.CurrentIndex = 1;
        Assert.Equal("u2", _pl.Current?.Url);
    }

    [Fact]
    public void 영속_라운드트립()
    {
        _pl.Add(Mk("u1", "제목1", "Hls"));
        _pl.Add(Mk("u2", "제목2", "Direct"));
        _pl.CurrentIndex = 1;
        _pl.Save(_path);

        var loaded = new MediaPlaylist();
        Assert.Equal(0, loaded.Tracks.Count);
        loaded.Load(_path);
        Assert.Equal(2, loaded.Tracks.Count);
        Assert.Equal("제목1", loaded.Tracks[0].Title);
        Assert.Equal("Hls", loaded.Tracks[0].Kind);
        Assert.Equal(1, loaded.CurrentIndex);
    }

    [Fact]
    public void 손상된_JSON은_빈_목록으로_시작()
    {
        File.WriteAllText(_path, "{broken");
        var pl = new MediaPlaylist();
        pl.Load(_path);
        Assert.Empty(pl.Tracks);
    }

    [Fact]
    public void 재생완료_표시와_완료필터()
    {
        _pl.Add(Mk("u1", "1"));
        _pl.Add(Mk("u2", "2"));
        _pl.MarkPlayed(_pl.Tracks[0]);
        Assert.True(_pl.Tracks[0].Played);
        Assert.False(_pl.Tracks[1].Played);
    }

    public void Dispose() { try { File.Delete(_path); } catch { } }
}