add music videos library (#125)

* add music videos library

* add music video tables

* first pass at music video library scan

* support music videos in playouts

* display music videos in search results and collections

* fix music video thumbnails

* remove some obsolete fields

ErsatzTV.Application/MediaCollections/Commands/AddItemsToCollection.cs

@@ -5,5 +5,9 @@ using LanguageExt;
 namespace ErsatzTV.Application.MediaCollections.Commands
 {
     public record AddItemsToCollection
-        (int CollectionId, List<int> MovieIds, List<int> ShowIds) : MediatR.IRequest<Either<BaseError, Unit>>;
+    (
+        int CollectionId,
+        List<int> MovieIds,
+        List<int> ShowIds,
+        List<int> MusicVideoIds) : MediatR.IRequest<Either<BaseError, Unit>>;
 }

ErsatzTV.Application/MediaCollections/Commands/AddItemsToCollectionHandler.cs

@@ -41,7 +41,7 @@ namespace ErsatzTV.Application.MediaCollections.Commands
         {
             if (await _mediaCollectionRepository.AddMediaItems(
                 request.CollectionId,
-                request.MovieIds.Append(request.ShowIds).ToList()))
+                request.MovieIds.Append(request.ShowIds).Append(request.MusicVideoIds).ToList()))
             {
                 // rebuild all playouts that use this collection
                 foreach (int playoutId in await _mediaCollectionRepository

ErsatzTV.Application/MediaCollections/Commands/AddMusicVideoToCollection.cs

@@ -0,0 +1,8 @@
+using ErsatzTV.Core;
+using LanguageExt;
+
+namespace ErsatzTV.Application.MediaCollections.Commands
+{
+    public record AddMusicVideoToCollection
+        (int CollectionId, int MusicVideoId) : MediatR.IRequest<Either<BaseError, Unit>>;
+}

ErsatzTV.Application/MediaCollections/Commands/AddMusicVideoToCollectionHandler.cs

@@ -0,0 +1,68 @@
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using ErsatzTV.Application.Playouts.Commands;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.Repositories;
+using LanguageExt;
+
+namespace ErsatzTV.Application.MediaCollections.Commands
+{
+    public class
+        AddMusicVideoToCollectionHandler : MediatR.IRequestHandler<AddMusicVideoToCollection, Either<BaseError, Unit>>
+    {
+        private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
+        private readonly IMediaCollectionRepository _mediaCollectionRepository;
+        private readonly IMusicVideoRepository _musicVideoRepository;
+
+        public AddMusicVideoToCollectionHandler(
+            IMediaCollectionRepository mediaCollectionRepository,
+            IMusicVideoRepository musicVideoRepository,
+            ChannelWriter<IBackgroundServiceRequest> channel)
+        {
+            _mediaCollectionRepository = mediaCollectionRepository;
+            _musicVideoRepository = musicVideoRepository;
+            _channel = channel;
+        }
+
+        public Task<Either<BaseError, Unit>> Handle(
+            AddMusicVideoToCollection request,
+            CancellationToken cancellationToken) =>
+            Validate(request)
+                .MapT(_ => ApplyAddMusicVideoRequest(request))
+                .Bind(v => v.ToEitherAsync());
+
+        private async Task<Unit> ApplyAddMusicVideoRequest(AddMusicVideoToCollection request)
+        {
+            if (await _mediaCollectionRepository.AddMediaItem(request.CollectionId, request.MusicVideoId))
+            {
+                // rebuild all playouts that use this collection
+                foreach (int playoutId in await _mediaCollectionRepository
+                    .PlayoutIdsUsingCollection(request.CollectionId))
+                {
+                    await _channel.WriteAsync(new BuildPlayout(playoutId, true));
+                }
+            }
+
+            return Unit.Default;
+        }
+
+        private async Task<Validation<BaseError, Unit>> Validate(AddMusicVideoToCollection request) =>
+            (await CollectionMustExist(request), await ValidateMusicVideo(request))
+            .Apply((_, _) => Unit.Default);
+
+        private Task<Validation<BaseError, Unit>> CollectionMustExist(AddMusicVideoToCollection request) =>
+            _mediaCollectionRepository.GetCollectionWithItems(request.CollectionId)
+                .MapT(_ => Unit.Default)
+                .Map(v => v.ToValidation<BaseError>("Collection does not exist."));
+
+        private Task<Validation<BaseError, Unit>> ValidateMusicVideo(AddMusicVideoToCollection request) =>
+            LoadMusicVideo(request)
+                .MapT(_ => Unit.Default)
+                .Map(v => v.ToValidation<BaseError>("Music video does not exist"));
+
+        private Task<Option<MusicVideo>> LoadMusicVideo(AddMusicVideoToCollection request) =>
+            _musicVideoRepository.GetMusicVideo(request.MusicVideoId);
+    }
+}