using System;
using System.Drawing;

using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK;

using org.nhengine.graphics;
using org.nhengine.graphics.primitives;

namespace nhengine
{



	public class OpenGLWindow : GameWindow
	{
		private GLCamera camera;

		private Point mouseCapturePosition;
		private bool mouseCaptured;

		private float arcUpDown,
					arcLeftRight;

		private Cube cube,
		c1, c2, c3;
		private Triangle triangle;


		public OpenGLWindow()
			:base(800, 600,
			      GraphicsMode.Default, 
			      "nhEngine", 
			      GameWindowFlags.Default, 
			      DisplayDevice.Default, 
			      3, 3,
			      GraphicsContextFlags.ForwardCompatible)
		{
			VSync = VSyncMode.On;
			camera = GlobalDefaults.instance().ActiveCamera;
			camera.Distance = 1000;
			camera.Position = new Vector3(1600, 1600, 1000);
		}

		protected override void OnLoad(EventArgs e)
		{
			base.OnLoad(e);
			GL.ClearColor(0.1f, 0.2f, 0.5f, 0.0f);
			GL.Enable(EnableCap.DepthTest);
			GL.Enable(EnableCap.Normalize);

			cube = new Cube(new Vector3(0,0,512), 128.0f);
			c1 = new Cube(new Vector3(512,0,512), 128.0f);
			c2 = new Cube(new Vector3(0,512,512), 128.0f);
			c3 = new Cube(new Vector3(512,512,512), 128.0f);

			triangle = new Triangle(new Vector3(0, 0, 0), new Vector3(600, 0, 0), new Vector3(600, 600, 0));
		}

		protected override void OnResize(EventArgs e)
		{
			base.OnResize(e);

			GL.Viewport(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);
			camera.setViewport(ClientRectangle.Width, ClientRectangle.Height);
		}

		protected override void OnRenderFrame(FrameEventArgs e)
		{
			base.OnRenderFrame(e);

			BootStrap boot = BootStrap.instance();

			GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

			cube.paint(camera);
			c1.paint(camera);
			c2.paint(camera);
			c3.paint(camera);


			boot.SquaredMap.paint(camera);
			//triangle.paint(camera);

			SwapBuffers();
		}

		private void captureMouse(){
			mouseCapturePosition = new Point(Mouse.X, Mouse.Y);
			mouseCaptured = true;
			CursorVisible = false;
		}

		private void releaseMouse(){
			mouseCaptured = false;
			CursorVisible = true;
		}

		protected override void OnMouseMove(OpenTK.Input.MouseMoveEventArgs e)
		{
			if (mouseCaptured){
				Point delta = new Point(e.X - mouseCapturePosition.X, e.Y - mouseCapturePosition.Y);
				onMouseCapturedMove(delta);
				mouseCapturePosition = e.Position;
			}
		}

		protected virtual void onMouseCapturedMove(Point delta){
            rotateLeftRight(((float)delta.X) / 10.0f);
            rotateUpDown(((float)delta.Y) / 10.0f);
		}

		protected override void OnMouseDown(OpenTK.Input.MouseButtonEventArgs e)
		{
			switch (e.Button){
				case OpenTK.Input.MouseButton.Left:
					break;		
				case OpenTK.Input.MouseButton.Right:
					captureMouse();
					break;		
			}
		}

		protected override void OnMouseUp(OpenTK.Input.MouseButtonEventArgs e)
		{
			releaseMouse();
		}

		protected override void OnMouseWheel(OpenTK.Input.MouseWheelEventArgs e)
		{
			camera.Distance += e.DeltaPrecise * 16.0f;
			if (camera.Distance < 0)
				camera.Distance = 0;
			applyRotation();
		}

		protected override void OnKeyPress(KeyPressEventArgs e)
		{
		}

		protected override void OnKeyDown(OpenTK.Input.KeyboardKeyEventArgs e)
		{
			switch (e.Key){
				case OpenTK.Input.Key.Up:
					rotateUpDown(MathHelper.Pi / 90.0f);
					break;
				case OpenTK.Input.Key.Down:
                    rotateUpDown(-MathHelper.Pi / 90.0f);
					break;
				case OpenTK.Input.Key.Left:
					rotateLeftRight(MathHelper.Pi / 90.0f);
					break;
				case OpenTK.Input.Key.Right:
					rotateLeftRight(-MathHelper.Pi / 90.0f);
					break;
			}	
		}

		public void rotateUpDown(float arc)
		{
			arcUpDown += arc;
			applyRotation();
		}
		public void rotateLeftRight(float arc)
		{
			arcLeftRight += arc;
			applyRotation();
		}

		private void applyRotation(){
			Console.WriteLine("Rotation: {0} {1}", arcLeftRight, arcUpDown);
			camera.MRotation = Matrix4.CreateRotationZ(arcLeftRight) * Matrix4.CreateRotationX(arcUpDown);

		}

		protected override void OnKeyUp(OpenTK.Input.KeyboardKeyEventArgs e)
		{
		}

	}
}