Phase D (T2-10): media playlist - auto-collect detected media, flyout management, player window (native+hls.js+dash.js bundles), persistence, auto-next (101 tests GREEN)

VideoDownloader.App/Browser/Features/MediaPlaylist.cs

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+using System.Collections.ObjectModel;
+using System.IO;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace VideoDownloader.App.Browser.Features;
+
+/// <summary>재생목록 트랙. Kind: Direct/Hls/Dash/Social.</summary>
+public sealed record MediaTrack(
+    string Url,
+    string Title,
+    string Kind,
+    DateTime AddedAt,
+    bool Played = false,
+    string? Referer = null,
+    string? LocalFile = null);
+
+/// <summary>
+/// T2-10 미디어 재생목록(Brave Playlist 패턴): 브라우저에서 감지된 미디어를
+/// 쌓아두고 앱 내에서 연속 재생. JSON 영속(playlist.json).
+/// </summary>
+public sealed class MediaPlaylist
+{
+    public ObservableCollection<MediaTrack> Tracks { get; } = new();
+
+    public int CurrentIndex { get; set; } = -1;
+
+    [JsonIgnore]
+    public MediaTrack? Current => CurrentIndex >= 0 && CurrentIndex < Tracks.Count ? Tracks[CurrentIndex] : null;
+
+    public event Action? Changed;
+
+    /// <summary>추가(중복 URL 무시). 새 항목이 첫 트랙이면 자동 선택.</summary>
+    public void Add(MediaTrack track)
+    {
+        if (Tracks.Any(t => t.Url == track.Url)) return;
+        Tracks.Add(track);
+        if (CurrentIndex < 0) CurrentIndex = Tracks.Count - 1;
+        Changed?.Invoke();
+    }
+
+    public void Remove(MediaTrack track)
+    {
+        var idx = Tracks.IndexOf(track);
+        if (idx < 0) return;
+        Tracks.RemoveAt(idx);
+        if (CurrentIndex >= Tracks.Count) CurrentIndex = Tracks.Count - 1;
+        Changed?.Invoke();
+    }
+
+    public void Clear()
+    {
+        Tracks.Clear();
+        CurrentIndex = -1;
+        Changed?.Invoke();
+    }
+
+    /// <summary>다음 트랙 인덱스(순환). 반환 후 CurrentIndex 갱신.</summary>
+    public int Next()
+    {
+        if (Tracks.Count == 0) return -1;
+        CurrentIndex = (CurrentIndex + 1) % Tracks.Count;
+        return CurrentIndex;
+    }
+
+    /// <summary>이전 트랙 인덱스(순환).</summary>
+    public int Previous()
+    {
+        if (Tracks.Count == 0) return -1;
+        CurrentIndex = (CurrentIndex - 1 + Tracks.Count) % Tracks.Count;
+        return CurrentIndex;
+    }
+
+    public void MarkPlayed(MediaTrack track)
+    {
+        var idx = Tracks.IndexOf(track);
+        if (idx < 0) return;
+        Tracks[idx] = track with { Played = true };
+        Changed?.Invoke();
+    }
+
+    public void Save(string path)
+    {
+        try
+        {
+            Directory.CreateDirectory(Path.GetDirectoryName(path)!);
+            var dto = new { tracks = Tracks.ToList(), currentIndex = CurrentIndex };
+            var tmp = path + ".tmp";
+            File.WriteAllText(tmp, JsonSerializer.Serialize(dto));
+            File.Move(tmp, path, overwrite: true);
+        }
+        catch { }
+    }
+
+    public void Load(string path)
+    {
+        try
+        {
+            if (!File.Exists(path)) return;
+            using var doc = JsonDocument.Parse(File.ReadAllText(path));
+            var root = doc.RootElement;
+            Tracks.Clear();
+            if (root.TryGetProperty("tracks", out var arr))
+                foreach (var t in arr.EnumerateArray())
+                {
+                    var track = t.Deserialize<MediaTrack>();
+                    if (track != null) Tracks.Add(track);
+                }
+            CurrentIndex = root.TryGetProperty("currentIndex", out var ci) ? ci.GetInt32() : -1;
+            if (CurrentIndex >= Tracks.Count) CurrentIndex = Tracks.Count - 1;
+        }
+        catch
+        {
+            Tracks.Clear();
+            CurrentIndex = -1;
+        }
+    }
+}