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 CellGraphPopulationTests
{
    [Fact]
    public void CacheCellStruct_AddsEnvCellToGraph_EvenWhenPhysicsBspIsNull()
    {
        var cache = new PhysicsDataCache();
        var cellStruct = new CellStruct
        {
            VertexArray = new VertexArray { Vertices = new Dictionary<ushort, SWVertex>() },
            Polygons = new Dictionary<ushort, Polygon>(),
            // PhysicsBSP omitted (defaults to null) — triggers the null-BSP drop from _cellStruct
        };
        var dat = new DatEnvCell
        {
            Flags = (DatReaderWriter.Enums.EnvCellFlags)0,
            CellPortals = new List<DatReaderWriter.Types.CellPortal>(),
            VisibleCells = new List<ushort>(),
        };

        cache.CacheCellStruct(0xA9B40174u, dat, cellStruct, Matrix4x4.Identity);

        Assert.Null(cache.GetCellStruct(0xA9B40174u));                  // dropped from physics cache
        Assert.NotNull(cache.CellGraph.GetVisible(0xA9B40174u));        // but present in the graph
        Assert.IsType<EnvCell>(cache.CellGraph.GetVisible(0xA9B40174u));
    }
}