custom collection playback order (#64)

* add custom index to collection items

* add custom collection order to ui

* cleanup

ErsatzTV.Application/MediaCollections/Commands/UpdateCollection.cs

@@ -1,8 +1,12 @@
 using ErsatzTV.Core;
 using LanguageExt;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Application.MediaCollections.Commands
 {
     public record UpdateCollection
-        (int CollectionId, string Name) : MediatR.IRequest<Either<BaseError, Unit>>;
+        (int CollectionId, string Name) : MediatR.IRequest<Either<BaseError, Unit>>
+    {
+        public Option<bool> UseCustomPlaybackOrder { get; set; } = None;
+    }
 }

ErsatzTV.Application/MediaCollections/Commands/UpdateCollectionCustomOrder.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+using ErsatzTV.Core;
+using LanguageExt;
+
+namespace ErsatzTV.Application.MediaCollections.Commands
+{
+    public record UpdateCollectionCustomOrder
+    (
+        int CollectionId,
+        List<MediaItemCustomOrder> MediaItemCustomOrders) : MediatR.IRequest<Either<BaseError, Unit>>;
+
+    public record MediaItemCustomOrder(int MediaItemId, int CustomIndex);
+}

ErsatzTV.Application/MediaCollections/Commands/UpdateCollectionCustomOrderHandler.cs

@@ -0,0 +1,66 @@
+using System.Linq;
+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
+        UpdateCollectionCustomOrderHandler : MediatR.IRequestHandler<UpdateCollectionCustomOrder,
+            Either<BaseError, Unit>>
+    {
+        private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
+        private readonly IMediaCollectionRepository _mediaCollectionRepository;
+
+        public UpdateCollectionCustomOrderHandler(
+            IMediaCollectionRepository mediaCollectionRepository,
+            ChannelWriter<IBackgroundServiceRequest> channel)
+        {
+            _mediaCollectionRepository = mediaCollectionRepository;
+            _channel = channel;
+        }
+
+        public Task<Either<BaseError, Unit>> Handle(
+            UpdateCollectionCustomOrder request,
+            CancellationToken cancellationToken) =>
+            Validate(request)
+                .MapT(c => ApplyUpdateRequest(c, request))
+                .Bind(v => v.ToEitherAsync());
+
+        private async Task<Unit> ApplyUpdateRequest(Collection c, UpdateCollectionCustomOrder request)
+        {
+            foreach (MediaItemCustomOrder updateItem in request.MediaItemCustomOrders)
+            {
+                Option<CollectionItem> maybeCollectionItem =
+                    c.CollectionItems.FirstOrDefault(ci => ci.MediaItemId == updateItem.MediaItemId);
+
+                maybeCollectionItem.IfSome(ci => ci.CustomIndex = updateItem.CustomIndex);
+            }
+
+            if (await _mediaCollectionRepository.Update(c))
+            {
+                // 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 Task<Validation<BaseError, Collection>> Validate(UpdateCollectionCustomOrder request) =>
+            CollectionMustExist(request);
+
+        private Task<Validation<BaseError, Collection>> CollectionMustExist(
+            UpdateCollectionCustomOrder request) =>
+            _mediaCollectionRepository.Get(request.CollectionId)
+                .Map(v => v.ToValidation<BaseError>("Collection does not exist."));
+    }
+}

ErsatzTV.Application/MediaCollections/Commands/UpdateCollectionHandler.cs

@@ -1,5 +1,7 @@
 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;
@@ -9,10 +11,16 @@ namespace ErsatzTV.Application.MediaCollections.Commands
 {
     public class UpdateCollectionHandler : MediatR.IRequestHandler<UpdateCollection, Either<BaseError, Unit>>
     {
+        private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
         private readonly IMediaCollectionRepository _mediaCollectionRepository;
 
-        public UpdateCollectionHandler(IMediaCollectionRepository mediaCollectionRepository) =>
+        public UpdateCollectionHandler(
+            IMediaCollectionRepository mediaCollectionRepository,
+            ChannelWriter<IBackgroundServiceRequest> channel)
+        {
             _mediaCollectionRepository = mediaCollectionRepository;
+            _channel = channel;
+        }
 
         public Task<Either<BaseError, Unit>> Handle(
             UpdateCollection request,
@@ -21,10 +29,21 @@ namespace ErsatzTV.Application.MediaCollections.Commands
                 .MapT(c => ApplyUpdateRequest(c, request))
                 .Bind(v => v.ToEitherAsync());
 
-        private async Task<Unit> ApplyUpdateRequest(Collection c, UpdateCollection update)
+        private async Task<Unit> ApplyUpdateRequest(Collection c, UpdateCollection request)
         {
-            c.Name = update.Name;
-            await _mediaCollectionRepository.Update(c);
+            c.Name = request.Name;
+            request.UseCustomPlaybackOrder.IfSome(
+                useCustomPlaybackOrder => c.UseCustomPlaybackOrder = useCustomPlaybackOrder);
+            if (await _mediaCollectionRepository.Update(c) && request.UseCustomPlaybackOrder.IsSome)
+            {
+                // 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;
         }
 

ErsatzTV.Application/MediaCollections/MediaCollectionViewModel.cs

@@ -3,6 +3,7 @@
 namespace ErsatzTV.Application.MediaCollections
 {
     public record MediaCollectionViewModel(int Id, string Name) : MediaCardViewModel(
+        Id,
         Name,
         string.Empty,
         Name,