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

namespace decePubClient.E2E.Support
{
	// Each render and action test is also a cell of the town's matrix, appended to the pasture's out/client.jsonl in the
	// cell format town.sh check writes, so report.html shows decePub next to the servers. A failure that an open gap of the
	// town's gaps.json names (a peer's own bug, say) is skipped with the gap's id rather than failed, as the report counts
	// it an expected failure.
	public static class Results
	{
		static readonly object Gate = new();
		static readonly string FilePath = Path.Combine(Pasture.Root, "out", "client.jsonl");
		static readonly Lazy<JsonArray> Gaps = new(() => JsonNode.Parse(File.ReadAllText(Path.Combine(Pasture.Root, "town", "gaps.json")))!.AsArray());

		// the open gap whose match (regular expressions over the cell's fields) fits this cell, if any
		static string KnownGap(string feature, string origin)
		{
			var fields = new Dictionary<string, string> { ["feature"] = feature, ["origin"] = origin, ["observer"] = "decepub" };
			return Gaps.Value.Where(g => g?["status"]?.GetValue<string>() != "closed" && g?["match"] is JsonObject)
				.FirstOrDefault(g => g!["match"]!.AsObject().All(m => Regex.IsMatch(fields.GetValueOrDefault(m.Key, ""), $"^(?:{m.Value!.GetValue<string>()})$")))
				?["id"]?.GetValue<string>();
		}

		public static async Task Cell(string feature, string origin, string reference, Func<Task> test) =>
			await Cell(feature, origin, reference, test, page: null);

		// with a page, a failure also leaves its screenshot and text in the test output's .state/ (SignIn.Evidence)
		public static async Task Cell(string feature, string origin, string reference, Func<Task> test, Microsoft.Playwright.IPage page)
		{
			var ok = false;
			string got = null;
			try
			{
				await test();
				ok = true;
			}
			catch (Exception e)
			{
				got = e.Message.Length > 400 ? e.Message[..400] : e.Message;
				if (page is not null)
					await SignIn.Evidence(page, $"{feature}-{origin}-{reference}".Replace('/', '_').Replace('@', '_'));
				if (KnownGap(feature, origin) is { } gap)
					Assert.Skip($"known gap {gap}: {got}");
				throw;
			}
			finally
			{
				var line = JsonSerializer.Serialize(new
				{
					source = "client", cell = $"{feature}|{origin}|decepub|{(origin == "privapub" ? "local" : "in")}", feature, origin,
					observer = "decepub", direction = origin == "privapub" ? "local" : "in", ok, @ref = reference, got,
					t = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ")
				});
				lock (Gate)
				{
					Directory.CreateDirectory(Path.GetDirectoryName(FilePath)!);
					File.AppendAllText(FilePath, line + "\n");
				}
			}
		}
	}
}