using System.Collections.Generic;
using System.Numerics;

namespace AcDream.Core.World.Cells;

/// <summary>
/// Base for every cell the player can stand in. Retail anchor: CObjCell
/// (acclient.h:30915). The id magnitude is the type discriminator
/// (<see cref="IsEnv"/>): low-16 &gt;= 0x100 =&gt; indoor <see cref="EnvCell"/>,
/// else outdoor <see cref="LandCell"/>.
/// </summary>
public abstract class ObjCell
{
    public uint Id { get; }
    public Matrix4x4 WorldTransform { get; }
    public Matrix4x4 InverseWorldTransform { get; }
    public Vector3 LocalBoundsMin { get; }
    public Vector3 LocalBoundsMax { get; }
    public IReadOnlyList<CellPortal> Portals { get; }
    public IReadOnlyList<uint> StabList { get; }
    public bool SeenOutside { get; }

    /// <summary>
    /// Retail magnitude dispatch (CObjCell::GetVisible, pseudo_c:308215).
    /// Note: retail's CObjCell::GetVisible tests the full id; every real prefixed EnvCell id is >= 0x100.
    /// This masks the low-16 so it works for both bare-16 and landblock-prefixed ids.
    /// </summary>
    public bool IsEnv => (Id & 0xFFFFu) >= 0x100u;

    protected ObjCell(uint id, Matrix4x4 worldTransform, Matrix4x4 inverseWorldTransform,
                      Vector3 localBoundsMin, Vector3 localBoundsMax,
                      IReadOnlyList<CellPortal> portals, IReadOnlyList<uint> stabList,
                      bool seenOutside)
    {
        Id = id;
        WorldTransform = worldTransform;
        InverseWorldTransform = inverseWorldTransform;
        LocalBoundsMin = localBoundsMin;
        LocalBoundsMax = localBoundsMax;
        Portals = portals;
        StabList = stabList;
        SeenOutside = seenOutside;
    }

    /// <summary>Retail CObjCell::point_in_cell (vtable +0x84). Is a world point inside this cell?</summary>
    public abstract bool PointInCell(Vector3 worldPoint);
}