Проведен аудит. Добавлено переключение треков

PlaylistShared.Api/Services/Yandex/YandexMusicService.cs

@@ -35,6 +35,21 @@ public class YandexMusicService
         return await Api.Playlist.GetAsync(ownerUid, kind);
     }
 
+    public async Task<YandexPlaylistData?> GetPlaylistDataAsync(ApplicationUser user, string ownerUid, string kind)
+    {
+        var playlist = await GetPlaylistAsync(user, ownerUid, kind);
+        return playlist == null ? null : MapToPlaylistData(playlist);
+    }
+
+    public async Task<(List<YPlaylist>? OwnPlaylists, string? AccountUid)> GetOwnFavoritesAsync(ApplicationUser user)
+    {
+        await AuthorizeIfNot(user);
+        var favorites = await Api.Playlist.FavoritesAsync();
+        var accountUid = _yandexApiService.Client.Account?.Uid;
+        var ownPlaylists = favorites?.Where(p => p.Owner?.Uid == accountUid).ToList();
+        return (ownPlaylists, accountUid);
+    }
+
     public async Task<YPlaylist?> CreatePlaylistAsync(ApplicationUser user, string title)
     {
         await AuthorizeIfNot(user);
@@ -339,4 +354,24 @@ public class YandexMusicService
 
         return result;
     }
+
+    private static YandexPlaylistData MapToPlaylistData(YPlaylist playlist) => new()
+    {
+        Title = playlist.Title,
+        Description = playlist.Description,
+        Tracks = playlist.Tracks.Select(t => new YandexTrack
+        {
+            TrackId = t.Track.Id,
+            Title = t.Track.Title,
+            Artists = t.Track.Artists.Select(a => new YandexArtist
+            {
+                Id = a.Id,
+                Name = a.Name,
+                CoverUrl = a.Cover.GetUrl(),
+                Description = a.Description?.Text ?? string.Empty,
+            }).ToList(),
+            DurationMs = (int)(t.Track?.DurationMs ?? 0),
+            CoverUri = t.Track?.CoverUri ?? ""
+        }).ToList()
+    };
 }