A lot of changes

backend/Musify.Application/PlayLists/AddTrackToPlayList.cs

@@ -49,10 +49,13 @@ namespace Musify.Application.PlayLists
                 return Error.Conflict(description: "Track is already in the playlist.");
             }
 
-            var nextPosition = await database.PlayListHasTracks
-                .Where(plt => plt.PlayListId == request.PlayListId)
-                .Select(plt => (int?)plt.Position)
-                .MaxAsync(cancellationToken) + 1 ?? 0;
+            var playListTracksQuery = database.PlayListHasTracks
+                .Where(plt => plt.PlayListId == request.PlayListId);
+
+            var hasTracks = await playListTracksQuery.AnyAsync(cancellationToken);
+            var nextPosition = hasTracks
+                ? await playListTracksQuery.MaxAsync(plt => plt.Position, cancellationToken) + 1
+                : 0;
 
             await database.PlayListHasTracks.AddAsync(new PlayListHasTrack
             {

backend/Musify.Application/PlayLists/AddYouTubeTrackToPlayList.cs

@@ -51,7 +51,7 @@ namespace Musify.Application.PlayLists
 
             var track = provisionResult.Value.Track;
 
-            var failed = track.Audio.TranscodeStatus == ProcessingStatus.Failed;
+            var failed = track.Audio.IsFailed;
             var neverQueued = !track.Audio.DownloadRequested && !track.Audio.IsProcessed;
             if (failed || neverQueued)
             {
@@ -82,10 +82,13 @@ namespace Musify.Application.PlayLists
                 return Error.Conflict(description: "Track is already in the playlist.");
             }
 
-            var nextPosition = await database.PlayListHasTracks
-                .Where(plt => plt.PlayListId == request.PlayListId)
-                .Select(plt => (int?)plt.Position)
-                .MaxAsync(cancellationToken) + 1 ?? 0;
+            var playListTracksQuery = database.PlayListHasTracks
+                .Where(plt => plt.PlayListId == request.PlayListId);
+
+            var hasTracks = await playListTracksQuery.AnyAsync(cancellationToken);
+            var nextPosition = hasTracks
+                ? await playListTracksQuery.MaxAsync(plt => plt.Position, cancellationToken) + 1
+                : 0;
 
             await database.PlayListHasTracks.AddAsync(new PlayListHasTrack
             {

backend/Musify.Application/PlayLists/CreatePlayList.cs

@@ -8,6 +8,7 @@ using Musify.Application.Events;
 using Musify.Application.PlayLists.Responses;
 using Musify.Application.Services;
 using Musify.Domain.Entities;
+using Musify.Domain.ValueObjects;
 using Musify.Application.Contracts;
 
 namespace Musify.Application.PlayLists
@@ -65,10 +66,13 @@ namespace Musify.Application.PlayLists
                 Name = request.Name,
                 NormalizedName = request.Name.Trim().ToUpperInvariant(),
                 Description = request.Description,
-                OriginalPictureName = originalPictureName,
-                SmallPictureName = playListConfiguration.Routes.PresetSmallPicture,
-                MediumPictureName = playListConfiguration.Routes.PresetMediumPicture,
-                LargePictureName = playListConfiguration.Routes.PresetLargePicture
+                Pictures = new PlayListPictures
+                {
+                    OriginalName = originalPictureName,
+                    SmallName = playListConfiguration.Routes.PresetSmallPicture,
+                    MediumName = playListConfiguration.Routes.PresetMediumPicture,
+                    LargeName = playListConfiguration.Routes.PresetLargePicture
+                }
             };
 
             await database.PlayLists.AddAsync(playList, cancellationToken);

backend/Musify.Application/PlayLists/GetPlayListCover.cs

@@ -22,7 +22,7 @@ namespace Musify.Application.PlayLists
         {
             var playList = await database.PlayLists.AsNoTracking()
                 .Where(p => p.Id == request.PlayListId)
-                .Select(p => new { p.SmallPictureName, p.MediumPictureName, p.LargePictureName })
+                .Select(p => new { p.Pictures.SmallName, p.Pictures.MediumName, p.Pictures.LargeName })
                 .SingleOrDefaultAsync(cancellationToken);
 
             if (playList == null)
@@ -31,9 +31,9 @@ namespace Musify.Application.PlayLists
             var routes = playListConfiguration.Routes;
             var (name, key, presetName) = request.Size.ToLowerInvariant() switch
             {
-                "small" => (playList.SmallPictureName, BuildKey(routes.BuildSmallPicturePath, playList.SmallPictureName), routes.PresetSmallPicture),
-                "large" => (playList.LargePictureName, BuildKey(routes.BuildLargePicturePath, playList.LargePictureName), routes.PresetLargePicture),
-                _ => (playList.MediumPictureName, BuildKey(routes.BuildMediumPicturePath, playList.MediumPictureName), routes.PresetMediumPicture)
+                "small" => (playList.SmallName, BuildKey(routes.BuildSmallPicturePath, playList.SmallName), routes.PresetSmallPicture),
+                "large" => (playList.LargeName, BuildKey(routes.BuildLargePicturePath, playList.LargeName), routes.PresetLargePicture),
+                _ => (playList.MediumName, BuildKey(routes.BuildMediumPicturePath, playList.MediumName), routes.PresetMediumPicture)
             };
 
             if (string.IsNullOrEmpty(name) || string.IsNullOrEmpty(key) || name == presetName)

backend/Musify.Application/PlayLists/Responses/PlayListApplicationResponse.cs

@@ -18,9 +18,9 @@ namespace Musify.Application.PlayLists.Responses
                 playList.Id,
                 playList.Name,
                 playList.Description,
-                playList.SmallPictureName,
-                playList.MediumPictureName,
-                playList.LargePictureName,
+                playList.Pictures.SmallName,
+                playList.Pictures.MediumName,
+                playList.Pictures.LargeName,
                 playList.CreatedAt,
                 playList.UpdatedAt);
         }

backend/Musify.Application/PlayLists/UpdatePlayList.cs

@@ -68,7 +68,7 @@ namespace Musify.Application.PlayLists
                     return validation.Errors;
 
                 pictureIntent = validation.Value;
-                playListEntity.OriginalPictureName = pictureIntent.ObjectName;
+                playListEntity.Pictures.OriginalName = pictureIntent.ObjectName;
                 finalPictureKey = playListConfiguration.Routes.BuildOriginalPicturePath(request.UserId, pictureIntent.ObjectName);
             }