using System.Collections.Immutable;
using Connected.Caching;
using Connected.Entities;
using Connected.Entities.Storage;
using Connected.Notifications.Events;
using Connected.ServiceModel;
using Connected.Services;

namespace Connected.Logistics.Documents.Receive;
internal sealed class ReceiveDocumentOps
{
	public sealed class Delete : ServiceAction<PrimaryKeyArgs<int>>
	{
		public Delete(IReceiveDocumentService documents, IStorageProvider storage, ICacheContext cache, IEventService events)
		{
			Documents = documents;
			Storage = storage;
			Cache = cache;
			Events = events;
		}

		private IReceiveDocumentService Documents { get; }
		private IStorageProvider Storage { get; }
		private ICacheContext Cache { get; }
		private IEventService Events { get; }

		protected override async Task OnInvoke()
		{
			if (SetState(await Documents.Select(Arguments)) is not IReceiveDocument document)
				return;

			/*
			 * Delete all items
			 */
			foreach (var item in await Documents.QueryItems(document.Id))
				await Documents.DeleteItem(item.Id);
			/*
			 * Delete document
			 */
			await Storage.Open<ReceiveDocument>().Update(Arguments.AsEntity<ReceiveDocument>(State.Deleted));
		}

		protected override async Task OnCommitted()
		{
			await Cache.Remove(ReceiveDocument.EntityKey, Arguments.Id);
			await Events.Enqueue(this, Documents, nameof(IReceiveDocumentService.Deleted), Arguments);
		}
	}

	public sealed class Insert : ServiceFunction<InsertReceiveDocumentArgs, int>
	{
		public Insert(IStorageProvider storage, IEventService events, IReceiveDocumentService documents)
		{
			Storage = storage;
			Events = events;
			Documents = documents;
		}

		private IStorageProvider Storage { get; }
		private IEventService Events { get; }
		private IReceiveDocumentService Documents { get; }

		protected override async Task<int> OnInvoke()
		{
			return (await Storage.Open<ReceiveDocument>().Update(Arguments.AsEntity<ReceiveDocument>(State.New))).Id;
		}

		protected override async Task OnCommitted()
		{
			await Events.Enqueue(this, Documents, nameof(IReceiveDocumentService.Inserted), new PrimaryKeyArgs<int> { Id = Result });
		}
	}

	public sealed class Query : ServiceFunction<QueryArgs, ImmutableList<IReceiveDocument>>
	{
		public Query(IStorageProvider storage)
		{
			Storage = storage;
		}

		public IStorageProvider Storage { get; }

		protected override async Task<ImmutableList<IReceiveDocument>> OnInvoke()
		{
			return await (from e in Storage.Open<ReceiveDocument>() select e).WithArguments(Arguments).AsEntities<IReceiveDocument>();
		}
	}

	public sealed class Select : NullableServiceFunction<PrimaryKeyArgs<int>, IReceiveDocument?>
	{
		public Select(IStorageProvider storage, ICacheContext cache)
		{
			Storage = storage;
			Cache = cache;
		}

		private IStorageProvider Storage { get; }
		private ICacheContext Cache { get; }

		protected override async Task<IReceiveDocument?> OnInvoke()
		{
			return await Cache.Get<ReceiveDocument>(ReceiveDocument.EntityKey, Arguments.Id, async (f) =>
			{
				return await (from e in Storage.Open<ReceiveDocument>() where e.Id == Arguments.Id select e).AsEntity();
			});
		}
	}

	public sealed class Update : ServiceAction<UpdateReceiveDocumentArgs>
	{
		public Update(IStorageProvider storage, ICacheContext cache, IEventService events, IReceiveDocumentService documents)
		{
			Storage = storage;
			Cache = cache;
			Events = events;
			Documents = documents;
		}

		private IStorageProvider Storage { get; }
		private ICacheContext Cache { get; }
		private IEventService Events { get; }
		private IReceiveDocumentService Documents { get; }

		protected override async Task OnInvoke()
		{
			if (await Documents.Select(Arguments.Id) is not ReceiveDocument entity)
				return;

			await Storage.Open<ReceiveDocument>().Update(entity, Arguments, async () =>
			{
				await Cache.Remove(ReceiveDocument.EntityKey, Arguments.Id);

				return (await Documents.Select(Arguments.Id)) as ReceiveDocument;
			});
		}

		protected override async Task OnCommitted()
		{
			await Cache.Remove(ReceiveDocument.EntityKey, Arguments.Id);
			await Events.Enqueue(this, Documents, nameof(IReceiveDocumentService.Updated), Arguments);
		}
	}
}