package lab4.gui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.Observable;
import java.util.Observer;

import javax.swing.JPanel;

import lab4.data.GameGrid;

/**
 * A panel providing a graphical view of the game board
 */

public class GamePanel extends JPanel implements Observer{

	private final int UNIT_SIZE = 20;
	private GameGrid grid;

	/**
	 * The constructor
	 *
	 * @param grid The grid that is to be displayed
	 */
	public GamePanel(GameGrid grid){
		this.grid = grid;
		grid.addObserver(this);
		Dimension d = new Dimension(grid.getSize()*UNIT_SIZE+1, grid.getSize()*UNIT_SIZE+1);
		this.setMinimumSize(d);
		this.setPreferredSize(d);
		this.setBackground(Color.WHITE);
	}

	/**
	 * Returns a grid position given pixel coordinates
	 * of the panel
	 *
	 * @param x the x coordinates
	 * @param y the y coordinates
	 * @return an integer array containing the [x, y] grid position
	 */
	public int[] getGridPosition(int x, int y){
		x = (int)(x / UNIT_SIZE);
		y = (int)(y / UNIT_SIZE);
		return new int[]{x,y};
	}

	public void update(Observable arg0, Object arg1) {
		this.repaint();
	}

	public void paintComponent(Graphics g){
		super.paintComponent(g);

		int size = grid.getSize();
		g.setColor(Color.black);
		for(int i = 0; i < size; i++){
			int x = i * UNIT_SIZE;
			int y = x;
			g.drawRect(x, 0, UNIT_SIZE * size, UNIT_SIZE);
			g.drawRect(0, y, UNIT_SIZE, UNIT_SIZE * size);

		}

	}

}