using Microsoft.AspNetCore.Http;

using PrivaPub.Infrastructure.Http;
using PrivaPub.Infrastructure.Statistics;
using PrivaPub.Tests.Support;

namespace PrivaPub.Tests.Statistics
{
	public class HttpScopeTests
	{
		[Fact]
		public async Task Scopes_nest_and_restore_across_awaits()
		{
			Assert.Null(HttpScope.Purpose);
			Assert.Equal("request", HttpScope.Trigger);

			using (HttpScope.Triggered("deliver"))
			{
				using (HttpScope.Default("object"))
				{
					Assert.Equal("object", HttpScope.Purpose);
					using (HttpScope.For("actor"))
					{
						await Task.Yield();
						Assert.Equal("actor", HttpScope.Purpose);
						using (HttpScope.Default("object"))
							Assert.Equal("actor", HttpScope.Purpose);
					}
					Assert.Equal("object", HttpScope.Purpose);
				}
				Assert.Null(HttpScope.Purpose);
				Assert.Equal("deliver", HttpScope.Trigger);
				Assert.False(HttpScope.Crawling);
				using (HttpScope.Crawl())
					Assert.True(HttpScope.Crawling);
			}
			Assert.Equal("request", HttpScope.Trigger);
		}
	}

	public class TrafficMeterTests
	{
		[Theory]
		[InlineData("api/v1/accounts/{id}/follow", "api/v1/accounts")]
		[InlineData("/api/v1/statuses", "api/v1/statuses")]
		[InlineData("/oauth/token", "oauth/token")]
		[InlineData("/clientapi/avatar/private/insert", "clientapi/avatar/private")]
		[InlineData("api/{x}", "api")]
		[InlineData(null, "unmatched")]
		public void Client_routes_group_by_their_first_literal_segments(string template, string group) =>
			Assert.Equal(group, TrafficMeter.Group(template));

		[Theory]
		[InlineData("peasants/{actor}", "/peasants/alice", "actor")]
		[InlineData("peasants/{actor}/anus", "/peasants/alice/anus", "outbox")]
		[InlineData("peasants/{actor}/flock", "/peasants/c/flock", "collection")]
		[InlineData("peasants/{actor}/groupies", "/peasants/alice/groupies", "collection")]
		[InlineData("peasants/{actor}/scribbles/{postId}", "/peasants/alice/scribbles/1", "object")]
		[InlineData("peasants/{actor}/grunts/{activityId}", "/peasants/alice/grunts/1", "activity")]
		[InlineData("peasants/{actor}/parrot-licences/{licenceId}", "/peasants/alice/parrot-licences/1", "licence")]
		[InlineData("users/{actor}", "/users/alice", "actor")]
		[InlineData(".well-known/webfinger", "/.well-known/webfinger", "webfinger")]
		[InlineData("nodeinfo/2.1", "/nodeinfo/2.1", "nodeinfo")]
		[InlineData("@{user}", "/@alice", null)]
		public void Served_documents_are_counted_by_kind_never_by_name(string template, string path, string kind) =>
			Assert.Equal(kind, TrafficMeter.Served(template, new PathString(path)));
	}

	public sealed class OutboundRequestTests : IAsyncLifetime
	{
		Peer _peer;

		public async ValueTask InitializeAsync() => _peer = await Peer.Start();

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

		[Fact]
		public async Task A_federation_fetch_is_recorded_with_its_purpose_trigger_and_size()
		{
			var ledger = new MemoryLedger();
			var http = Peer.Http(ledger: ledger);
			_peer.Serve("/users/a", "{\"id\":\"{A}/users/a\",\"type\":\"Person\"}");

			using (HttpScope.Triggered("processinbox"))
			using (HttpScope.For("actor"))
				Assert.NotNull(await http.GetJson($"{_peer.A}/users/a", "application/activity+json", default, TestContext.Current.CancellationToken));

			var e = Assert.Single(ledger.Of("http"));
			Assert.Equal(("127.0.0.1", "actor", "processinbox", "ok", 200), (e.Host, e.Purpose, e.Trigger, e.Outcome, e.Status!.Value));
			Assert.True(e.Bytes > 10);
			Assert.Equal(0, e.Redirects);
		}

		[Fact]
		public async Task Refusals_are_recorded_and_a_second_try_is_remembered()
		{
			var ledger = new MemoryLedger();
			var http = Peer.Http(ledger: ledger);
			_peer.Answer("/gone", 410);
			_peer.ServeText("/page", "<html></html>", "text/html");

			using (HttpScope.Triggered("fetchancestors"))
			{
				await http.GetJson($"{_peer.A}/gone", "application/activity+json", default, TestContext.Current.CancellationToken);
				await http.GetJson($"{_peer.A}/gone", "application/activity+json", default, TestContext.Current.CancellationToken);
				await http.GetJson($"{_peer.A}/page", "application/activity+json", default, TestContext.Current.CancellationToken);
				await http.GetJson("ftp://example.org/x", "application/activity+json", default, TestContext.Current.CancellationToken);
			}

			var events = ledger.Of("http");
			Assert.Equal(new[] { ("refused", "410"), ("refused", "remembered"), ("refused", "content-type"), ("refused", "disallowed") },
				events.Select(e => (e.Outcome, e.Reason)));
			Assert.Equal("object", events[0].Purpose);
		}

		[Fact]
		public async Task A_fetch_a_reader_caused_is_only_counted()
		{
			var ledger = new MemoryLedger();
			var http = Peer.Http(ledger: ledger);
			_peer.Serve("/users/b", "{\"id\":\"{A}/users/b\",\"type\":\"Person\"}");

			using (HttpScope.For("webfinger"))
				await http.GetJson($"{_peer.A}/users/b", "application/activity+json", default, TestContext.Current.CancellationToken);

			Assert.Empty(ledger.Events);
			Assert.Equal(1, ledger.Counts[("127.0.0.1", "http:webfinger:ok")]);
		}
	}
}