package main;

import game.GameController;

import java.awt.Point;
import java.awt.geom.Point2D;

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.AWTGLCanvas;
import org.lwjgl.opengl.GL11;

/***
 * @author Krunoslav Saho
 * 12/06/2005
 * GameLoop.java
 */
public class GameLoop extends AWTGLCanvas
{
	private int width, height;
	private boolean canExit, vsync;
	
	private GameController game;
	private Point2D.Float clickCoords;
	private boolean init;
	
	
	@Override
	protected void paintGL()
	{
		if(!init)
		{
			init();
			init = true;
		}
		else
		{
			display();
		}
	}


	public GameLoop(int width, int height, boolean vsync) throws LWJGLException
	{
		super();
		
		game = new GameController();
		clickCoords = new Point2D.Float(-1, -1);
		
		this.width = width;
		this.height = height;
		this.vsync = vsync;
		this.canExit = false;
		
//		this.setVSyncEnabled(vsync);
	}
	

	private void init()
	{
		GL11.glDisable(GL11.GL_DEPTH_BUFFER_BIT);
		GL11.glClearColor(.3f, .4f, .5f, 1f);
		GL11.glEnableClientState(GL11.GL_VERTEX_ARRAY);
		
		GL11.glMatrixMode(GL11.GL_PROJECTION);
		GL11.glLoadIdentity();
		GL11.glOrtho(0, width, height, 0, -1, 1);
		GL11.glLoadIdentity();
		GL11.glMatrixMode(GL11.GL_MODELVIEW);
		GL11.glLoadIdentity();
	}

	private void display()
	{
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
		GL11.glLoadIdentity();
		
		if(this.clickCoords.x != -1 && this.clickCoords.y != -1)
			convertScreenCoordsToWorld();
		
		game.run();
		canExit = game.isDone();
		
		this.clickCoords.x = -1;
		this.clickCoords.y = -1;
	}

	private void convertScreenCoordsToWorld()
	{
		double[] modelView = new double[16];
		double[] projection = new double[16];
		int[] view = new int[4];
		double[] pos = new double[] {this.clickCoords.x, this.clickCoords.y, 0};
		//FIXME repair unproject
//		GL11.glGetDoublev(GL11.GL_MODELVIEW_MATRIX, modelView);
//		GL11.glGetDoublev(GL11.GL_PROJECTION_MATRIX, projection);
//		GL11.glGetIntegerv(GL11.GL_VIEWPORT, view);
//		
//		glu.gluUnProject
//		(
//				this.clickCoords.x, view[3] - this.clickCoords.y, 0,
//				modelView,
//				projection,
//				view,
//				pos
//		);
		
		this.clickCoords.x = (float)pos[0];
		this.clickCoords.y = (float)pos[1];
		game.setClickCoords(this.clickCoords);
	}


	public boolean canExit()
	{
		return this.canExit;
	}

	public void setClickCoords(Point clickCoords)
	{
		this.clickCoords.x = clickCoords.x;
		this.clickCoords.y = clickCoords.y;
	}

}