using AcDream.App.Composition;
using AcDream.App.Streaming;
using DatReaderWriter.DBObjs;

namespace AcDream.App.Tests.Composition;

public sealed class SessionPlayerCompositionTests
{
    [Fact]
    public void RuntimeBindingsReleaseInReverseAndRetryOnlyFailedEdges()
    {
        var calls = new List<string>();
        var bindings = new SessionPlayerRuntimeBindings();
        bindings.Adopt("first", new RetryBinding("first", calls, 0));
        bindings.Adopt("second", new RetryBinding("second", calls, 1));

        Assert.Throws<AggregateException>(bindings.Dispose);
        Assert.Equal(["second", "first"], calls);

        bindings.Dispose();
        bindings.Dispose();

        Assert.Equal(["second", "first", "second"], calls);
        Assert.Throws<ObjectDisposedException>(() =>
            bindings.Adopt("late", new RetryBinding("late", calls, 0)));
    }

    [Fact]
    public void SpawnClaimClassifierPreservesIndoorBoundaryMemoAndReset()
    {
        int lookups = 0;
        uint lastDid = 0;
        var info = new LandBlockInfo { NumCells = 2 };
        var classifier = new DatSpawnClaimHydrationClassifier(did =>
        {
            lookups++;
            lastDid = did;
            return info;
        });

        Assert.False(classifier.IsUnhydratable(0x123400FFu));
        Assert.Equal(0, lookups);
        Assert.False(classifier.IsUnhydratable(0x12340100u));
        Assert.Equal(0x1234FFFEu, lastDid);
        Assert.False(classifier.IsUnhydratable(0x12340100u));
        Assert.Equal(1, lookups);
        Assert.False(classifier.IsUnhydratable(0x12340101u));
        Assert.True(classifier.IsUnhydratable(0x12340102u));

        classifier.Reset();
        Assert.True(classifier.IsUnhydratable(0x12340102u));
        Assert.Equal(4, lookups);
    }

    [Fact]
    public void MissingOrEmptyLandblockMakesIndoorClaimUnhydratable()
    {
        var missing = new DatSpawnClaimHydrationClassifier(_ => null);
        var empty = new DatSpawnClaimHydrationClassifier(
            _ => new LandBlockInfo { NumCells = 0 });

        Assert.True(missing.IsUnhydratable(0x12340100u));
        Assert.True(empty.IsUnhydratable(0x12340100u));
    }

    [Fact]
    public void GameWindowUsesSessionPhaseAndContainsNoPhaseSevenBody()
    {
        string root = FindRepoRoot();
        string window = File.ReadAllText(Path.Combine(
            root,
            "src",
            "AcDream.App",
            "Rendering",
            "GameWindow.cs"));
        string phase = File.ReadAllText(Path.Combine(
            root,
            "src",
            "AcDream.App",
            "Composition",
            "SessionPlayerComposition.cs"));

        Assert.Contains("new SessionPlayerCompositionPhase(", window);
        Assert.DoesNotContain("LandblockStreamer.CreateForRequests(", window);
        Assert.DoesNotContain("new AcDream.App.Net.LiveSessionController()", window);
        Assert.DoesNotContain(
            "new AcDream.App.Streaming.LocalPlayerTeleportController(",
            window);
        Assert.DoesNotContain("IsSpawnClaimUnhydratable", window);
        Assert.Contains("LandblockStreamer.CreateForRequests(", phase);
        Assert.Contains("new LiveSessionController()", phase);
        Assert.Contains("new LocalPlayerTeleportController(", phase);
        Assert.Contains("new DatSpawnClaimHydrationClassifier(", phase);
    }

    [Fact]
    public void ProductionPhaseStartsStreamerBeforeSessionAndTransfersPortalLast()
    {
        string phase = File.ReadAllText(Path.Combine(
            FindRepoRoot(),
            "src",
            "AcDream.App",
            "Composition",
            "SessionPlayerComposition.cs"));

        AssertAppearsInOrder(
            phase,
            "LandblockStreamer.CreateForRequests(",
            "streamerLease.Resource.Start();",
            "new StreamingController(",
            "new WorldRevealCoordinator(",
            "new LiveSessionController()",
            "new LiveEntityHydrationController(",
            "new LiveEntityNetworkUpdateController(",
            "new GameplayInputFrameController(",
            "new PlayerModeController(",
            "d.PortalTunnelFallback.Transfer(",
            "d.TeleportSink.BindOwned(localTeleport)",
            "sessionRuntimeFactory.Create(liveSession)",
            "d.CombatModeCommands.BindOwned(combatCommand)",
            "d.RuntimeDiagnosticCommands.BindOwned(runtimeDiagnostics)",
            "GameplayInputActionRouter.Create(",
            "gameplayActions.Attach();",
            "_publication.PublishSessionPlayer(result);");

        Assert.DoesNotContain("GameWindow", File.ReadAllText(Path.Combine(
            FindRepoRoot(),
            "src",
            "AcDream.App",
            "Net",
            "LiveSessionRuntimeFactory.cs")), StringComparison.Ordinal);
    }

    private sealed class RetryBinding(
        string name,
        List<string> calls,
        int failures) : IDisposable
    {
        private int _failures = failures;

        public void Dispose()
        {
            calls.Add(name);
            if (_failures-- > 0)
                throw new InvalidOperationException("retry");
        }
    }

    private static void AssertAppearsInOrder(string source, params string[] values)
    {
        int cursor = 0;
        foreach (string value in values)
        {
            int found = source.IndexOf(value, cursor, StringComparison.Ordinal);
            Assert.True(found >= 0, $"Missing expected source fragment: {value}");
            cursor = found + value.Length;
        }
    }

    private static string FindRepoRoot()
    {
        DirectoryInfo? directory = new(AppContext.BaseDirectory);
        while (directory is not null)
        {
            if (File.Exists(Path.Combine(directory.FullName, "AcDream.slnx")))
                return directory.FullName;
            directory = directory.Parent;
        }

        throw new DirectoryNotFoundException("Could not find AcDream.slnx.");
    }
}