using MongoDB.Entities;

using PrivaPub.Models.Federation;
using PrivaPub.Models.Post;
using PrivaPub.Models.Social;
using PrivaPub.Tests.Support;

using System.Text.Json.Nodes;

using static PrivaPub.Tests.Support.FederatedSeeds;

namespace PrivaPub.Tests.Federation
{
	// A deleted remote post is never brought back by its own Create, however late it comes; an id its server gives a new
	// post afterwards (Gancio numbers an event after the last one it keeps) is that new post
	[Trait("Category", "Integration")]
	public sealed class ReusedIdTests : IAsyncLifetime
	{
		Harness _harness;

		public async ValueTask InitializeAsync()
		{
			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
			_harness = await Harness.Start();
		}

		public async ValueTask DisposeAsync()
		{
			if (_harness != default)
				await _harness.DisposeAsync();
		}

		[Fact]
		public async Task A_deleted_posts_create_stays_dropped_and_a_new_post_under_its_id_is_kept()
		{
			var token = TestContext.Current.CancellationToken;
			var (_, alice) = await _harness.Persona("alice");
			var carol = new RemoteActor(_harness.Peer, "carol");
			await Follows(alice.Id, carol);
			var first = PublicNote(carol, "<p>the first event</p>");
			first["published"] = DateTime.UtcNow.AddMinutes(-10).ToString("O");
			await _harness.Deliver(carol, "/human-centipede", Create(carol, first));
			await _harness.Deliver(carol, "/human-centipede", new JsonObject
			{
				["id"] = NewId(carol, "deletes"), ["type"] = "Delete", ["actor"] = carol.Id,
				["object"] = new JsonObject { ["id"] = IdOf(first), ["type"] = "Tombstone" }
			});
			Assert.True(await DB.Default.Find<DeletedObject>().Match(d => d.ObjectURI == IdOf(first)).ExecuteAnyAsync(token));

			// the first Create again, late
			await _harness.Deliver(carol, "/human-centipede", Create(carol, (JsonObject)first.DeepClone()));
			Assert.False(await DB.Default.Find<Post>().Match(p => p.ObjectURI == IdOf(first) && !p.DeletedAt.HasValue).ExecuteAnyAsync(token));

			var second = PublicNote(carol, "<p>a new event, numbered as the first</p>");
			second["id"] = IdOf(first);
			second["published"] = DateTime.UtcNow.ToString("O");
			await _harness.Deliver(carol, "/human-centipede", Create(carol, second));

			var kept = await DB.Default.Find<Post>().Match(p => p.ObjectURI == IdOf(first) && !p.DeletedAt.HasValue).ExecuteFirstAsync(token);
			Assert.Contains("a new event", kept?.ContentHtml);
			Assert.False(await DB.Default.Find<DeletedObject>().Match(d => d.ObjectURI == IdOf(first)).ExecuteAnyAsync(token));
		}
	}
}