using CodeImp.DoomBuilder.Rendering;
using SlimDX;

namespace CodeImp.DoomBuilder.GZBuilder.Data
{
    public struct BoundingBoxSizes
    {
        public short MinX;
        public short MaxX;
        public short MinY;
        public short MaxY;
        public short MinZ;
        public short MaxZ;

        //we need some reference here
        public BoundingBoxSizes(WorldVertex v) {
            MinX = MaxX = (short)v.x;
            MinY = MaxY = (short)v.y;
            MinZ = MaxZ = (short)v.z;
        }
    }

    public class BoundingBoxTools
    {
        //this creates array of vectors resembling bounding box
        public static Vector3[] CalculateBoundingBox(BoundingBoxSizes bbs) {
            //center
            Vector3 v0 = new Vector3(bbs.MinX + (bbs.MaxX - bbs.MinX) / 2, bbs.MinY + (bbs.MaxY - bbs.MinY) / 2, bbs.MinZ + (bbs.MaxZ - bbs.MinZ) / 2);

            //corners
            Vector3 v1 = new Vector3(bbs.MinX, bbs.MinY, bbs.MinZ);
            Vector3 v2 = new Vector3(bbs.MaxX, bbs.MinY, bbs.MinZ);
            Vector3 v3 = new Vector3(bbs.MinX, bbs.MaxY, bbs.MinZ);
            Vector3 v4 = new Vector3(bbs.MaxX, bbs.MaxY, bbs.MinZ);
            Vector3 v5 = new Vector3(bbs.MinX, bbs.MinY, bbs.MaxZ);
            Vector3 v6 = new Vector3(bbs.MaxX, bbs.MinY, bbs.MaxZ);
            Vector3 v7 = new Vector3(bbs.MinX, bbs.MaxY, bbs.MaxZ);
            Vector3 v8 = new Vector3(bbs.MaxX, bbs.MaxY, bbs.MaxZ);

            return new Vector3[] { v0, v1, v2, v3, v4, v5, v6, v7, v8 };
        }

        public static Vector3[] CalculateBoundingPlane(BoundingBoxSizes bbs) {
            //mxd. looks like I need only these 2 points, so...
            //center
            Vector3 v0 = new Vector3(bbs.MinX + (bbs.MaxX - bbs.MinX) / 2, bbs.MinY + (bbs.MaxY - bbs.MinY) / 2, bbs.MinZ + (bbs.MaxZ - bbs.MinZ) / 2);
            Vector3 v1 = new Vector3(bbs.MinX, bbs.MinY, bbs.MinZ);
            return new Vector3[] { v0, v1 };
        }

        /*public static Vector3[] CalculateBoundingPlane(BoundingBoxSizes bbs) {
            if(bbs.MinX != bbs.MaxX && bbs.MinY != bbs.MaxY && bbs.MinZ != bbs.MaxZ)
                return CalculateBoundingBox(bbs);

            //center
            Vector3 v0 = new Vector3(bbs.MinX + (bbs.MaxX - bbs.MinX) / 2, bbs.MinY + (bbs.MaxY - bbs.MinY) / 2, bbs.MinZ + (bbs.MaxZ - bbs.MinZ) / 2);
            Vector3 v1, v2, v3, v4;

            //corners
            if (bbs.MinX == bbs.MaxX) {
                v1 = new Vector3(bbs.MinX, bbs.MinY, bbs.MinZ);
                v2 = new Vector3(bbs.MinX, bbs.MaxY, bbs.MinZ);
                v3 = new Vector3(bbs.MinX, bbs.MinY, bbs.MaxZ);
                v4 = new Vector3(bbs.MinX, bbs.MaxY, bbs.MaxZ);
            } else if (bbs.MinY == bbs.MaxY) {
                v1 = new Vector3(bbs.MinX, bbs.MinY, bbs.MinZ);
                v2 = new Vector3(bbs.MaxX, bbs.MinY, bbs.MinZ);
                v3 = new Vector3(bbs.MinX, bbs.MinY, bbs.MaxZ);
                v4 = new Vector3(bbs.MaxX, bbs.MinY, bbs.MaxZ);
            } else {
                v1 = new Vector3(bbs.MinX, bbs.MinY, bbs.MinZ);
                v2 = new Vector3(bbs.MaxX, bbs.MinY, bbs.MinZ);
                v3 = new Vector3(bbs.MinX, bbs.MaxY, bbs.MinZ);
                v4 = new Vector3(bbs.MaxX, bbs.MaxY, bbs.MinZ);
            }

            return new Vector3[] { v0, v1, v2, v3, v4 };
        }*/

        public static void UpdateBoundingBoxSizes(ref BoundingBoxSizes bbs, WorldVertex v) {
            if (v.x < bbs.MinX)
                bbs.MinX = (short)v.x;
            else if (v.x > bbs.MaxX)
                bbs.MaxX = (short)v.x;

            if (v.z < bbs.MinZ)
                bbs.MinZ = (short)v.z;
            else if (v.z > bbs.MaxZ)
                bbs.MaxZ = (short)v.z;

            if (v.y < bbs.MinY)
                bbs.MinY = (short)v.y;
            else if (v.y > bbs.MaxY)
                bbs.MaxY = (short)v.y;
        }
    }
}