using System.Collections.Generic;
using System.Numerics;
using AcDream.Core.Physics;
using AcDream.Core.World.Cells;
using DatReaderWriter.Types;
using Xunit;
using DatEnvCell = DatReaderWriter.DBObjs.EnvCell;

namespace AcDream.Core.Tests.Physics;

public class CellGraphMembershipTests
{
    [Fact]
    public void ResolveCellId_Resolved_WritesCurrCellTrackingTheResolvedId()
    {
        var engine = new PhysicsEngine();
        var cache = new PhysicsDataCache();
        engine.DataCache = cache;

        var cs = new CellStruct {
            VertexArray = new VertexArray { Vertices = new Dictionary<ushort, SWVertex>() },
            Polygons = new Dictionary<ushort, Polygon>(),
            PhysicsBSP = null,
        };
        var dat = new DatEnvCell {
            Flags = (DatReaderWriter.Enums.EnvCellFlags)0,
            CellPortals = new List<DatReaderWriter.Types.CellPortal>(),
            VisibleCells = new List<ushort>(),
        };
        cache.CacheCellStruct(0xA9B40174u, dat, cs, Matrix4x4.Identity);  // registers in the graph (W1)

        uint result = engine.ResolveCellId(new Vector3(0, 0, 0), 0.5f, 0xA9B40174u);

        // CurrCell tracks whatever id ResolveCellId returned (when that id is in the graph).
        Assert.NotNull(cache.CellGraph.CurrCell);
        Assert.Equal(result, cache.CellGraph.CurrCell!.Id);
        Assert.Equal(0xA9B40174u, cache.CellGraph.CurrCell!.Id);
    }
}