using System;

using OpenTK;
using org.budnhead.core;

namespace org.budnhead.graphics.primitives
{
	public class Cube : WorldObject
	{
		public Cube(Vector3 position, float width)
		{
			Scale.Value = Matrix4.CreateScale(width);
			Position.Value = position;
		}

		public override Model3D getModel3D()
		{
			return CubeModel.inst;
		}

	}

	class CubeModel : Model3D {

		public static Vector4[] ccolors = new Vector4[]{
			new Vector4(1.0f,0.0f,0.0f,1.0f),
			new Vector4(1.0f,0.0f,0.0f,1.0f),
			new Vector4(1.0f,0.0f,0.0f,1.0f),
			new Vector4(1.0f,1.0f,0.0f,1.0f),
			new Vector4(0.0f,0.9f,0.0f,1.0f),
			new Vector4(0.0f,0.9f,0.0f,1.0f),
			new Vector4(0.0f,0.9f,0.0f,1.0f),
			new Vector4(0.0f,0.9f,1.0f,1.0f),
			new Vector4(0.0f,0.0f,1.0f,1.0f),
			new Vector4(0.0f,0.0f,1.0f,1.0f),
			new Vector4(0.0f,0.0f,1.0f,1.0f),
			new Vector4(1.0f,0.0f,1.0f,1.0f)
		};

		public static CubeModel inst = new CubeModel();

		public CubeModel(){
			Vector3 dx, dy, dz;
			Vector3 a, b, c, d, e, f, g, h;

			dx = (Vector3.UnitX / 2);
			dy = (Vector3.UnitY / 2);
			dz = (Vector3.UnitZ / 2);

			a =  - dx - dy - dz;
			b =    dx - dy - dz;
			c =    dx + dy - dz;
			d =  - dx + dy - dz;
			e =  - dx - dy + dz;
			f =    dx - dy + dz;
			g =    dx + dy + dz;
			h =  - dx + dy + dz;

			prepareBuffers(12);

			Model3D.setTriangle(vertexes, 0, c, b, a);
			Model3D.setTriangle(vertexes, 1, a, d, c);
			Model3D.setTriangle(vertexes, 2, h, e, f);
			Model3D.setTriangle(vertexes, 3, f, g, h);

			Model3D.setTriangle(vertexes, 4, d, a, e);
			Model3D.setTriangle(vertexes, 5, e, h, d);
			Model3D.setTriangle(vertexes, 6, g, f, b);
			Model3D.setTriangle(vertexes, 7, b, c, g);

			Model3D.setTriangle(vertexes, 8, f, e, a);
			Model3D.setTriangle(vertexes, 9, a, b, f);
			Model3D.setTriangle(vertexes, 10, d, h, g);
			Model3D.setTriangle(vertexes, 11, g, c, d);

			for (int n=0;n<colors.Length;n++){
				this.colors[n] = CubeModel.ccolors[ n / 3 ];
			}

			computeNormals();

			rebind();
		}

	}
}