using AcDream.App.Tests.Rendering;
using AcDream.App.Rendering.Walk;
using DatReaderWriter;
using DatReaderWriter.Options;

namespace AcDream.App.Tests.Rendering.Walk;

/// <summary>
/// FW1's conformance gate, first slice: replay pose-stamped oracle
/// fixtures through the ported walk and require the identical event
/// sequence. The projection-light interior fixtures gate first
/// (docs/research/2026-08-30-fw-walk-oracle/README.md, posed round);
/// the outdoor/landscape fixtures join as the landscape world build
/// lands.
/// </summary>
[Trait("Lane", "InstalledDat")]
public sealed class WalkTraceConformanceTests
{
    private sealed class Recorder : IWalkEventSink
    {
        public readonly List<WalkEvent> Events = new();
        public void Emit(in WalkEvent walkEvent) => Events.Add(walkEvent);
    }

    private static DatCollection OpenDats()
    {
        string? datDir = CornerFloodReplayTests.ResolveDatDir();
        if (datDir is null)
        {
            Assert.Fail("Lane=InstalledDat requires an installed retail DAT directory; see docs/release-gate.md.");
        }
        return new DatCollection(datDir!, DatAccessType.Read);
    }

    [Fact]
    public void Foundry_deep_reproduces_every_complete_frame_exactly()
    {
        IReadOnlyList<WalkOracleFrame> frames = WalkOracleTrace.Load("posed/foundry-deep");
        Assert.NotEmpty(frames);
        using DatCollection dats = OpenDats();
        Dictionary<uint, WalkCell> cells =
            WalkWorldDatAdapter.BuildInteriorCells(dats, 0xA9B40000u);
        var landscape = new WalkLandscape { MidWidth = 1, Blocks = new WalkLandBlock?[1] };

        foreach (WalkOracleFrame frame in frames)
        {
            Assert.NotNull(frame.Pose);
            WalkCell camera = Assert.Contains(frame.Pose!.CellId, cells);
            var ctx = new WalkTraceReplayContext(frame.Pose, cells);
            var walk = new RetailFrameWalk();
            var recorder = new Recorder();

            walk.WalkFrame(frame.Pose.CellId, camera, landscape, ctx, recorder);

            Assert.Equal(
                WalkTraceReplayContext.Signature(frame),
                WalkTraceReplayContext.Signature(recorder.Events));
        }
    }
}