using MongoDB.Entities;

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

using System.Text.Json.Nodes;

namespace PrivaPub.Tests.Federation
{
	[Trait("Category", "Integration")]
	public sealed class CommunityModerationTests : 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();
		}

		static string Origin(string id) => new Uri(id).GetLeftPart(UriPartial.Authority);

		// a Lemmy community on the peer's first origin whose moderators collection lists the given accounts
		RemoteActor Community(params RemoteActor[] moderators)
		{
			var community = new RemoteActor(_harness.Peer, "comm", type: "Group");
			var document = community.Document();
			document["attributedTo"] = community.Id + "/moderators";
			_harness.Peer.Serve($"/users/{community.Name}", document.ToJsonString());
			_harness.Peer.Serve($"/users/{community.Name}/moderators", new JsonObject
			{
				["id"] = community.Id + "/moderators", ["type"] = "OrderedCollection",
				["orderedItems"] = new JsonArray(moderators.Select(m => (JsonNode)m.Id).ToArray())
			}.ToJsonString());
			return community;
		}

		async Task<(Post Post, PrivaPub.Federation.Actors.LocalActor Alice)> PostIn(RemoteActor community)
		{
			var token = TestContext.Current.CancellationToken;
			var (root, alice) = await _harness.Persona("alice");
			await _harness.Posts.InsertPost(root, new InsertPostForm { AvatarId = alice.Id, Text = "in the community" }, token);
			var post = await DB.Default.Find<Post>().Match(p => p.GroupUserId == alice.Id).ExecuteFirstAsync(token);
			await DB.Default.Update<Post>().MatchID(post.ID).Modify(p => p.AudienceURI, community.Id).ExecuteAsync(token);
			await _harness.Remote.GetActor(community.Id, refresh: true, token);
			return (post, alice);
		}

		JsonObject Warn(RemoteActor moderator, RemoteActor community, string persona, string post) => new()
		{
			["id"] = $"{Origin(moderator.Id)}/activities/warn/{Guid.NewGuid():N}", ["type"] = "Warn", ["actor"] = moderator.Id,
			["to"] = new JsonArray(persona), ["object"] = post, ["summary"] = "please keep it civil", ["audience"] = community.Id
		};

		[Fact]
		public async Task A_warning_from_the_communitys_moderators_reaches_the_persona_and_a_strangers_does_not()
		{
			var token = TestContext.Current.CancellationToken;
			var listed = new RemoteActor(_harness.Peer, "listedmod", origin: _harness.Peer.B);
			var stranger = new RemoteActor(_harness.Peer, "stranger", origin: _harness.Peer.B);
			var community = Community(listed);
			var admin = new RemoteActor(_harness.Peer, "admin");
			var (post, alice) = await PostIn(community);

			await _harness.Deliver(stranger, "/human-centipede", Warn(stranger, community, alice.Uri, post.ObjectURI));
			Assert.False(await DB.Default.Find<Notification>().Match(n => n.AvatarId == alice.Id && n.Type == NotificationType.ModerationWarning).ExecuteAnyAsync(token));

			await _harness.Deliver(listed, "/human-centipede", Warn(listed, community, alice.Uri, post.ObjectURI));
			var warning = await DB.Default.Find<Notification>().Match(n => n.AvatarId == alice.Id && n.Type == NotificationType.ModerationWarning).ExecuteFirstAsync(token);
			Assert.Equal("please keep it civil", warning.Text);
			Assert.Equal(post.ID, warning.PostId);

			var adminWarning = Warn(admin, community, alice.Uri, post.ObjectURI);
			adminWarning["summary"] = "from the server's admin";
			await DB.Default.DeleteAsync<Notification>(n => n.AvatarId == alice.Id);
			await _harness.Deliver(admin, "/human-centipede", adminWarning);
			Assert.Equal("from the server's admin", (await DB.Default.Find<Notification>().Match(n => n.AvatarId == alice.Id && n.Type == NotificationType.ModerationWarning).ExecuteFirstAsync(token)).Text);
		}

		[Fact]
		public async Task A_reports_resolution_is_kept_only_from_the_server_holding_what_was_reported()
		{
			var token = TestContext.Current.CancellationToken;
			var community = Community();
			var (post, _) = await PostIn(community);
			var report = new Report { PostIds = new() { post.ID }, Comment = "spam" };
			await DB.Default.SaveAsync(report, token);
			var flag = $"{_harness.Local.BaseAddress}/peasants/privapub_reports/grunts/flag-{report.ID}-1";
			JsonObject Resolve(RemoteActor by) => new()
			{
				["id"] = $"{Origin(by.Id)}/activities/resolve/{Guid.NewGuid():N}", ["type"] = "Resolve", ["actor"] = by.Id, ["to"] = new JsonArray(community.Id),
				["object"] = new JsonObject { ["id"] = flag, ["type"] = "Flag", ["actor"] = $"{_harness.Local.BaseAddress}/peasants/privapub_reports", ["object"] = post.ObjectURI }
			};
			var elsewhere = new RemoteActor(_harness.Peer, "elsewhere", origin: _harness.Peer.B);
			var moderator = new RemoteActor(_harness.Peer, "moderator");

			await _harness.Deliver(elsewhere, "/human-centipede", Resolve(elsewhere));
			Assert.Null((await DB.Default.Find<Report>().OneAsync(report.ID, token)).RemoteResolvedAt);

			await _harness.Deliver(moderator, "/human-centipede", Resolve(moderator));
			var resolved = await DB.Default.Find<Report>().OneAsync(report.ID, token);
			Assert.NotNull(resolved.RemoteResolvedAt);
			Assert.Equal(moderator.Id, resolved.RemoteResolvedBy);
			Assert.False(resolved.IsResolved);
		}
	}
}