using System.Text.Json.Nodes;

using decePubClient.E2E.Support;

using Microsoft.Playwright;

namespace decePubClient.E2E.Actions
{
	// Accounts in decePub: found by searching their handle (PrivaPub resolves it), opened as a profile, followed and
	// unfollowed there; the follow is checked on the account's own server, where the persona must appear as a follower.
	public sealed class ProfileTests(Browser browser)
	{
		static readonly string[] Platforms = ["gts", "mastodon", "akkoma", "misskey", "sharkey"];

		public static TheoryData<string> Origins() => new(Platforms);

		// an account of the platform that the persona does not follow yet, from the town's own sessions
		static (string Platform, string UserName, string Token) Stranger(string platform, Pasture.Persona persona)
		{
			var sessions = JsonNode.Parse(File.ReadAllText(Path.Combine(Pasture.Root, ".state", "town", "sessions.json")))!.AsObject();
			var candidates = sessions.Where(kv => kv.Key.StartsWith(platform + "/") && !kv.Key.Contains("/st_"))
				.Select(kv => (platform, kv.Value!["account"]!["username"]!.GetValue<string>(), kv.Value!["token"]!.GetValue<string>()))
				.ToList();
			return candidates.Last();
		}

		// the newest GoToSocial account that SocialPub's moves scenario moved (scenarios/moves.sh), as PrivaPub knows it
		static async Task<(string Old, string New)> Moved()
		{
			var start = new System.Diagnostics.ProcessStartInfo("podman") { RedirectStandardOutput = true, RedirectStandardError = true };
			foreach (var arg in new[] { "exec", "pasture-mongo", "mongosh", "--quiet", "PrivaPub", "--eval",
				"const a = db.ForeignAvatar.find({ActorURI: {$regex: 'gts.test.users.mvold'}, MovedToURL: {$ne: null}}).sort({_id: -1}).limit(1).toArray()[0];" +
				"print(a ? a.ActorURI + ' ' + a.MovedToURL : '')" })
				start.ArgumentList.Add(arg);
			using var process = System.Diagnostics.Process.Start(start)!;
			var output = (await process.StandardOutput.ReadToEndAsync()).Trim();
			await process.WaitForExitAsync();
			var parts = output.Split(' ', StringSplitOptions.RemoveEmptyEntries);
			return parts.Length == 2 ? (parts[0], parts[1]) : default;
		}

		[Fact]
		public async Task A_moved_accounts_profile_says_where_it_went()
		{
			var (old, moved) = await Moved();
			Assert.SkipWhen(old is null, "no moved account: run SocialPub's tools/pasture/interop.sh moves");
			var persona = Pasture.Personas().First();
			var handle = old.Split("/users/")[1] + "@gts.test";
			await using var session = await SignIn.As(browser, persona);
			await Results.Cell("client.render.moved", "gts", handle, async () =>
			{
				await session.Page.GotoAsync($"{Pasture.Site}/search?q={Uri.EscapeDataString("@" + handle)}");
				var banner = session.Page.Locator("[data-moved]");
				await banner.WaitForAsync(new() { Timeout = 30000 });
				await Assertions.Expect(banner).ToContainTextAsync("@" + moved.Split("/users/")[1] + "@gts.test");
				await session.AssertGuards();
			}, session.Page);
		}

		[Theory]
		[MemberData(nameof(Origins))]
		public async Task A_remote_account_found_by_its_handle_is_followed_and_unfollowed_from_its_profile(string platform)
		{
			var persona = Pasture.Personas().First();
			var (_, userName, _) = Stranger(platform, persona);
			var handle = $"{userName}@{platform}.test";
			await using var session = await SignIn.As(browser, persona);
			await Results.Cell("client.action.follow", platform, handle, async () =>
			{
				await session.Page.GotoAsync($"{Pasture.Site}/search?q={Uri.EscapeDataString("@" + handle)}");
				var profile = session.Page.Locator("article[data-account-id]").First;
				await profile.WaitForAsync(new() { Timeout = 30000 });
				await Assertions.Expect(profile).ToContainTextAsync("@" + handle);

				var follow = profile.GetByRole(AriaRole.Button).Filter(new() { HasTextRegex = new System.Text.RegularExpressions.Regex("^(Follow|Unfollow|Cancel the request)$") }).First;
				if ((await follow.InnerTextAsync()).Trim() != "Follow")
				{
					await follow.ClickAsync();
					await Assertions.Expect(follow).ToHaveTextAsync("Follow", new() { Timeout = 15000 });
				}
				await follow.ClickAsync();
				await Assertions.Expect(follow).Not.ToHaveTextAsync("Follow", new() { Timeout = 15000 });
				Assert.True(await Pasture.Eventually(async () => await FollowedOn(platform, userName, persona.UserName), 45),
					$"{handle} never learnt that {persona.UserName} follows it");

				await follow.ClickAsync();
				await Assertions.Expect(follow).ToHaveTextAsync("Follow", new() { Timeout = 15000 });
				Assert.True(await Pasture.Eventually(async () => !await FollowedOn(platform, userName, persona.UserName), 45),
					$"{handle} still has {persona.UserName} as a follower after the unfollow");
				await session.AssertGuards();
			}, session.Page);
		}

		// whether the peer itself lists the persona as following (or asking to follow) its account
		static async Task<bool> FollowedOn(string platform, string userName, string persona)
		{
			var result = await Pasture.Town("drive", platform, userName, "relationship", $"{{\"acct\": \"{persona}@privapub.test\"}}");
			return result?["followed_by"]?.GetValue<bool>() == true || (await Pasture.Town("drive", platform, userName, "pending", "{}"))
				.AsArray().Any(a => a?.GetValue<string>()?.StartsWith(persona + "@") == true);
		}

		[Fact]
		public async Task The_personas_own_profile_lists_its_posts()
		{
			var persona = Pasture.Personas().First();
			await using var session = await SignIn.As(browser, persona);
			await Results.Cell("client.render.profile", "privapub", persona.UserName, async () =>
			{
				await session.Page.GotoAsync($"{Pasture.Site}/account/{persona.LocalId}");
				var profile = session.Page.Locator("article[data-account-id]").First;
				await profile.WaitForAsync(new() { Timeout = 30000 });
				await Assertions.Expect(profile).ToContainTextAsync("@" + persona.UserName);
				await session.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
				await session.AssertGuards();
			}, session.Page);
		}
	}
}