using System;
using System.Numerics;
using AcDream.Core.Physics;
using Xunit;

namespace AcDream.Core.Tests.Physics;

public class PhysicsEngineResidencyTests
{
    [Fact]
    public void IsLandblockTerrainResident_trueOnlyAfterAddLandblock()
    {
        var eng = new PhysicsEngine();
        uint canonical = 0xA9B4FFFFu;          // canonical (streaming) form
        uint lbId      = canonical & 0xFFFF0000u; // AddLandblock id

        Assert.False(eng.IsLandblockTerrainResident(canonical));

        eng.AddLandblock(lbId, terrain: null!, cells: Array.Empty<CellSurface>(),
            portals: Array.Empty<PortalPlane>(), worldOffsetX: 0f, worldOffsetY: 0f);

        Assert.True(eng.IsLandblockTerrainResident(canonical));
    }

    [Fact]
    public void IsLandblockTerrainResident_matchesOnHigh16_acceptsCellResolvedId()
    {
        var eng = new PhysicsEngine();
        eng.AddLandblock(0xA9B40000u, null!, Array.Empty<CellSurface>(),
            Array.Empty<PortalPlane>(), 0f, 0f);
        Assert.True(eng.IsLandblockTerrainResident(0xA9B40019u));  // cell-resolved id, same LB
        Assert.False(eng.IsLandblockTerrainResident(0xC6A90019u)); // different LB
    }
}