using System.Numerics;
using AcDream.Core.Physics;
using DatReaderWriter;
using DatReaderWriter.Options;
using Xunit;
using Xunit.Abstractions;

namespace AcDream.Core.Tests.Conformance;

/// <summary>
/// #112 (2026-06-10): the A9B3 hill cottage has a real containment GAP inside
/// the house (world (184.9, −109.5, 116) / A9B3-local (184.9, 82.5) is in NO
/// interior cell while points ~0.7 m away are inside 0x100/0x103). The
/// 6dbbf95 escape hatch demoted the walker to the outdoor column there,
/// stranding them outdoor-classified deep indoors (no containment-based
/// re-promotion) → the outdoor flood rendered the interior transparent.
/// Retail find_cell_list KEEPS curr_cell when nothing contains the centre
/// (pc:308788-308825). These tests pin the replacement semantics against the
/// real dats.
/// </summary>
public sealed class Issue112MembershipTests
{
    private readonly ITestOutputHelper _out;
    public Issue112MembershipTests(ITestOutputHelper output) => _out = output;

    private const float FootRadius = 0.48f;

    private static PhysicsDataCache LoadLandblockInteriors(DatCollection dats, uint lbPrefix)
    {
        var cache = new PhysicsDataCache();
        for (uint low = 0x0100; low <= 0x01FF; low++)
        {
            try { ConformanceDats.LoadEnvCell(dats, cache, lbPrefix | low); }
            catch { }
        }
        return cache;
    }

    [Fact]
    public void A9B3CottageGap_IndoorSeed_DemotesViaOutdoorCandidates_DocumentsResidual()
    {
        var datDir = ConformanceDats.ResolveDatDir();
        if (datDir is null) { _out.WriteLine("dats unavailable — skipped"); return; }
        using var dats = new DatCollection(datDir, DatAccessType.Read);
        var cache = LoadLandblockInteriors(dats, 0xA9B30000u);

        // The gap point (A9B3-local frame, footcenter height): contained by NO
        // interior cell (dat-scan fact from the live capture issue111-verify7).
        var gap = new Vector3(184.915f, 82.464f, 116.48f);

        uint picked = CellTransit.FindCellList(cache, gap, FootRadius, 0xA9B30104u);
        _out.WriteLine($"pick(seed 0x104) at gap -> 0x{picked:X8}");

        // DOCUMENTS THE #112 RESIDUAL (flips loudly when fixed): the gap sits
        // in the doorway region, so the BFS from 0x104 reaches the exterior
        // portal and outdoor cells enter the candidate array → the NORMAL
        // outdoorResult path demotes (not the removed escape hatch — its
        // removal fixed the deep-room stranding; re-promotion now happens at
        // the doorway cells on the way back in). Open question for the fix:
        // retail's CEnvCell::find_transit_cells gate for add_all_outside_cells
        // (pc:317499 region) — if it requires sphere proximity to the exterior
        // portal POLYGON (not just graph reachability), this demote disappears
        // and the assert below should become Assert.Equal(0xA9B30104u, ...).
        Assert.Equal(0xA9B3003Cu, picked);
    }

    [Fact]
    public void ThresholdCottage_AdjacentClaim_LaterallyRecovers_ViaStabGraph()
    {
        var datDir = ConformanceDats.ResolveDatDir();
        if (datDir is null) { _out.WriteLine("dats unavailable — skipped"); return; }
        using var dats = new DatCollection(datDir, DatAccessType.Read);
        var cache = LoadLandblockInteriors(dats, 0xA9B40000u);

        // The #111 gate shape: claim 0x172 (adjacent room), position deep
        // inside 0x171 (the captured spawn). The sphere does not overlap
        // 0x172's volume from there → the new lateral recovery searches the
        // claim's stab list (retail find_visible_child_cell :311444) and
        // self-heals to 0x171 — instead of the old outdoor demote.
        var spawnFootCenter = new Vector3(155.390f, 11.020f, 94.0f + FootRadius);

        uint picked = CellTransit.FindCellList(cache, spawnFootCenter, FootRadius, 0xA9B40172u);
        _out.WriteLine($"pick(seed 0x172) at 0x171-interior -> 0x{picked:X8}");
        Assert.Equal(0xA9B40171u, picked);
    }
}