#region ================== Namespaces

using System;
using SlimDX.Direct3D9;
using CodeImp.DoomBuilder.Rendering;

#endregion

namespace CodeImp.DoomBuilder.GZBuilder.Rendering
{
	sealed class ThingBoundingBox : IDisposable, ID3DResource
	{

		#region ================== Variables

		private VertexBuffer cage;
		private VertexBuffer arrow;
		private bool isdisposed;

		#endregion

		#region ================== Properties

		public VertexBuffer Cage { get { return cage; } }
		public VertexBuffer Arrow { get { return arrow; } }

		#endregion

		#region ================== Constructor / Disposer

		public ThingBoundingBox() 
		{
			// Create geometry
			ReloadResource();

			// Register as resource
			General.Map.Graphics.RegisterResource(this);
		}

		public void Dispose() 
		{
			// Not already disposed?
			if (!isdisposed)
			{
				if (arrow != null) arrow.Dispose();
				if (cage != null) cage.Dispose();

				// Unregister resource
				General.Map.Graphics.UnregisterResource(this);

				// Done
				isdisposed = true;
			}
		}

		#endregion

		#region ================== Methods

		// This is called resets when the device is reset
		// (when resized or display adapter was changed)
		public void ReloadResource() 
		{
			WorldVertex v0 = new WorldVertex(-1.0f, -1.0f, 0.0f);
			WorldVertex v1 = new WorldVertex(-1.0f, 1.0f, 0.0f);
			WorldVertex v2 = new WorldVertex(1.0f, 1.0f, 0.0f);
			WorldVertex v3 = new WorldVertex(1.0f, -1.0f, 0.0f);

			WorldVertex v4 = new WorldVertex(-1.0f, -1.0f, 1.0f);
			WorldVertex v5 = new WorldVertex(-1.0f, 1.0f, 1.0f);
			WorldVertex v6 = new WorldVertex(1.0f, 1.0f, 1.0f);
			WorldVertex v7 = new WorldVertex(1.0f, -1.0f, 1.0f);

			//cage
			WorldVertex[] cageVerts = new WorldVertex[] { v0, v1,
														  v1, v2,
														  v2, v3,
														  v3, v0,
														  v4, v5, 
														  v5, v6,
														  v6, v7,
														  v7, v4,
														  v0, v4,
														  v1, v5,
														  v2, v6,
														  v3, v7 };

			cage = new VertexBuffer(General.Map.Graphics.Device, WorldVertex.Stride * cageVerts.Length, Usage.WriteOnly | Usage.Dynamic, VertexFormat.None, Pool.Default);
			cage.Lock(0, WorldVertex.Stride * cageVerts.Length, LockFlags.None).WriteRange(cageVerts);
			cage.Unlock();

			//arrow
			WorldVertex a0 = new WorldVertex(); //start
			WorldVertex a1 = new WorldVertex(1.5f, 0.0f, 0.0f); //end
			WorldVertex a2 = new WorldVertex(1.1f, 0.2f, 0.2f);
			WorldVertex a3 = new WorldVertex(1.1f, -0.2f, 0.2f);
			WorldVertex a4 = new WorldVertex(1.1f, 0.2f, -0.2f);
			WorldVertex a5 = new WorldVertex(1.1f, -0.2f, -0.2f);

			WorldVertex[] arrowVerts = new WorldVertex[] {a0, a1,
														  a1, a2,
														  a1, a3,
														  a1, a4,
														  a1, a5};

			arrow = new VertexBuffer(General.Map.Graphics.Device, WorldVertex.Stride * arrowVerts.Length, Usage.WriteOnly | Usage.Dynamic, VertexFormat.None, Pool.Default);
			arrow.Lock(0, WorldVertex.Stride * arrowVerts.Length, LockFlags.None).WriteRange(arrowVerts);
			arrow.Unlock();
		}

		// This is called before a device is reset
		// (when resized or display adapter was changed)
		public void UnloadResource() 
		{
			// Trash geometry buffers
			if(cage != null) cage.Dispose();
			if(arrow != null) arrow.Dispose();
			cage = null;
			arrow = null;
		}

		#endregion
	}
}