using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Localization;
using Microsoft.Extensions.Logging.Abstractions;

using MongoDB.Entities;

using PrivaPub.Domain.Content;
using PrivaPub.Domain.Media;
using PrivaPub.Domain.Relationships;
using PrivaPub.Domain.Social;
using PrivaPub.Domain.Statuses;
using PrivaPub.Domain.Timelines;
using PrivaPub.Federation.Actors;
using PrivaPub.Federation.Inbox;
using PrivaPub.Federation.Inbox.Handlers;
using PrivaPub.Federation.Outbox;
using PrivaPub.Infrastructure.Jobs;
using PrivaPub.Models;
using PrivaPub.Federation.Objects;
using PrivaPub.Models.Federation;
using PrivaPub.Models.Jobs;
using PrivaPub.Models.User;
using PrivaPub.Resources;
using PrivaPub.Services;
using PrivaPub.StaticServices;

using System.Text.Json;
using System.Text.Json.Nodes;

namespace PrivaPub.Tests.Support
{
	public sealed class Harness : IAsyncDisposable
	{
		public const string Host = "privapub.test";
		public const string Base = "https://" + Host;

		readonly DateTime _started = Millisecond(DateTime.UtcNow);

		Harness(Peer peer)
		{
			Peer = peer;
			var cache = new MemoryCache(new MemoryCacheOptions());
			Local = new LocalActorService(Db, new StaticOptions<AppConfiguration>(new AppConfiguration { BackendBaseAddress = Base }));
			Remote = new RemoteActorService(Peer.Http(cache), Local, cache, Db);
			Delivery = new DeliveryService(Db, Queue);
			Fanout = new Fanout(Db);
			Groups = new GroupDistributor(Delivery);
			Records = new ObjectRecords(Queue);
			Polls = new PollService(Db, Local, Delivery, Queue);
			Reactions = new Reactions(Db, Delivery);
			RemotePosts = new RemotePosts(Db, Local, Remote, new NoBlocks(), Queue, Records, new NoPreviews());
			Outbox = new OutboxPublisher(Db, Local, Delivery);
			Quotes = new QuoteService(Db, Remote, RemotePosts, Local, Delivery, Outbox);
			Receiver = new InboxReceiver(Local, Remote, Queue, new NoBlocks(), NullLogger<InboxReceiver>.Instance);
			Processor = new InboxProcessor(Remote, new IActivityHandler[]
			{
				new FollowHandler(Db, Local, Remote, Delivery),
				new AcceptHandler(Db, Local, Quotes),
				new RejectHandler(Db, Local, Quotes),
				new UndoHandler(Db, Local, Reactions),
				new LikeHandler(Db, Reactions),
				new EmojiReactHandler(Db, Reactions),
				new QuoteRequestHandler(Quotes),
				new DislikeHandler(Db),
				new JoinHandler(Db, Local, Delivery),
				new AnnounceHandler(Db, Local, RemotePosts, Fanout, Remote),
				new CreateHandler(Db, Local, Remote, Delivery, new NoBlocks(), Fanout, RemotePosts, Groups, Records, Polls, new NoPreviews(), Quotes),
				new DeleteHandler(Db, Local, Remote, Delivery, Groups, Quotes),
				new UpdateHandler(Db, Local, Remote, Groups, Records, Quotes),
				new FlagHandler(Db, Local)
			}, NullLogger<InboxProcessor>.Instance);
			Follows = new FollowService(Db, Local, Remote, Delivery, new KeyLocalizer<GenericRes>(), NullLogger<FollowService>.Instance);
			Content = new ContentRenderer(Local, Remote);
			Media = new MediaService(new StaticOptions<MediaOptions>(new MediaOptions { Root = Path.Combine(Path.GetTempPath(), $"privapub-media-{Guid.NewGuid():N}") }),
				Local, default, NullLogger<MediaService>.Instance);
			Statuses = new StatusService(Db, Local, Remote, Delivery, Content, Outbox, Fanout, Media, Groups, Polls, new NoPreviews(), Quotes);
			Posts = new PostsService(Db, Local, Statuses, new KeyLocalizer<GenericRes>(), NullLogger<PostsService>.Instance);
			Timelines = new TimelineService(Db, new KeyLocalizer<GenericRes>());
			Relationships = new RelationshipService(Db, Follows, Delivery);
			Reports = new ReportService(Db, Local, Delivery);
		}

		public Peer Peer { get; }
		public DbEntities Db { get; } = new();
		public JobQueue Queue { get; } = new();
		public LocalActorService Local { get; }
		public RemoteActorService Remote { get; }
		public DeliveryService Delivery { get; }
		public InboxReceiver Receiver { get; }
		public InboxProcessor Processor { get; }
		public FollowService Follows { get; }
		public ContentRenderer Content { get; }
		public OutboxPublisher Outbox { get; }
		public PostsService Posts { get; }
		public StatusService Statuses { get; }
		public MediaService Media { get; }
		public GroupDistributor Groups { get; }
		public Fanout Fanout { get; }
		public RemotePosts RemotePosts { get; }
		public ObjectRecords Records { get; }
		public PollService Polls { get; }
		public Reactions Reactions { get; }
		public QuoteService Quotes { get; }
		public TimelineService Timelines { get; }
		public RelationshipService Relationships { get; }
		public ReportService Reports { get; }

		public async Task FollowedBy(LocalActor local, RemoteActor follower) =>
			await DB.Default.SaveAsync(new Follower
			{
				LocalActorId = local.Id,
				LocalActorKind = local.Kind,
				ActorURI = follower.Id,
				InboxURL = follower.Id + "/inbox",
				SharedInboxURL = follower.SharedInbox
			});

		public static async Task<Harness> Start() => new(await Peer.Start());

		public async Task<(string RootId, LocalActor Avatar)> Persona(string name, string rootId = default)
		{
			rootId ??= Guid.NewGuid().ToString("N")[..24];
			var (privateKey, publicKey) = Keys.NewKeyPair();
			var avatar = new Avatar { UserName = $"{name}{Guid.NewGuid():N}"[..20], Name = name, PrivateKey = privateKey, PublicKey = publicKey };
			await DB.Default.SaveAsync(avatar);
			await DB.Default.SaveAsync(new RootToAvatar { RootId = rootId, AvatarId = avatar.ID });
			return (rootId, Local.FromAvatar(avatar));
		}

		public async Task<InboxResult> Deliver(RemoteActor sender, string path, JsonNode activity)
		{
			var result = await Receiver.Receive(sender.Post(Host, path, activity), default, CancellationToken.None);
			var dedupe = "inbox|" + (activity is JsonObject ? activity["id"]?.GetValue<string>() : default);
			var job = await DB.Default.Find<Job>().Match(j => j.DedupeKey == dedupe).ExecuteFirstAsync();
			if (job != default)
				Assert.Equal(JobResult.Done, (await Processor.Handle(job, CancellationToken.None)).Result);
			return result;
		}

		public async Task<List<JsonObject>> Outgoing(string inbox) =>
			(await DB.Default.Find<Job>().Match(j => j.Kind == JobKind.Deliver && j.CreatedAt >= _started).ExecuteAsync())
				.Select(j => JsonSerializer.Deserialize<DeliveryPayload>(j.Payload))
				.Where(p => p.Inbox == inbox)
				.Select(p => JsonNode.Parse(p.Body)!.AsObject())
				.ToList();

		public async ValueTask DisposeAsync() => await Peer.DisposeAsync();

		static DateTime Millisecond(DateTime time) => new(time.Ticks - time.Ticks % TimeSpan.TicksPerMillisecond, DateTimeKind.Utc);
	}

	public sealed class KeyLocalizer<T> : IStringLocalizer<T>
	{
		public LocalizedString this[string name] => new(name, name);
		public LocalizedString this[string name, params object[] arguments] => new(name, string.Format(name, arguments));
		public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures) => Enumerable.Empty<LocalizedString>();
	}

	public sealed class NoPreviews : ILinkPreviews
	{
		public Task Wanted(PrivaPub.Models.Post.Post post, CancellationToken token) => Task.CompletedTask;
	}
}