package il.co.tomer.game;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class Game extends JPanel implements MouseMotionListener{

    private static final long serialVersionUID = 1L;

    public static final int FPS = 60;
    public static final int WINDOW_LEFT_BORDER_SIZE = 8;
    public static final int WINDOW_TOP_BORDER_SIZE = 20;

    private Point target;
    private float ballHorizontalLocation = 50f;
    private float ballVerticalLocation = 50f;
    private int ballWidth = 150;
    private int ballHeight = 150;

    public static void main(String[] args) // first function to be called
    {
        new Game();
    }

    private Game() // constructor for the Game object (also our JPanel and MouseMotionListener)
    {
        initialize(); //initialize our game - set the window settings and add listeners
        startGame(); // start our game loops
    }

    private void initialize()
    {
        JFrame jf = new JFrame("Tomer and Gal's Game");
        jf.setVisible(true);
        jf.setSize(800, 600);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setLocationRelativeTo(null);
        jf.add(this);
        jf.addMouseMotionListener(this);
    }

    private void startGame()
    {
        new Timer().scheduleAtFixedRate(new TimerTask(){

            @Override
            public void run() {

                updateGame(); //update game 60 times a second
                drawGame(); //draw game 60 times a second

            }}, 0, 1000 / FPS); // 60 FPS
    }

    private void drawGame()
    {
        repaint();
    }

    private void updateGame()
    {
        if (target != null)
        {
            if (this.ballHorizontalLocation < target.getX()) // if the ball is left to the mouse
            {
                this.ballHorizontalLocation += 1; // minimize the gap
            }

            if (this.ballHorizontalLocation > target.getX()) // if the ball is right to the mouse
            {
                this.ballHorizontalLocation -= 1; // minimize the gap
            }

            if (this.ballVerticalLocation < target.getY()) // if the ball is above the mouse
            {
                this.ballVerticalLocation += 1; // minimize the gap
            }

            if (this.ballVerticalLocation > target.getY()) // if the ball is below the mouse
            {
                this.ballVerticalLocation -= 1; // minimize the gap
            }
        }
    }

    public void paintComponent(Graphics g)
    {
        //set ANTIALIASING
        Graphics2D g2 = (Graphics2D)g;
            RenderingHints rh = new RenderingHints(
                     RenderingHints.KEY_ANTIALIASING,
                     RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setRenderingHints(rh);

        //draw pink background
        g2.setColor(Color.PINK);
        g2.fillRect(0, 0, 800, 600);

        //draw our ball
        g2.setColor(Color.WHITE);
        g2.fillOval((int)ballHorizontalLocation, (int)ballVerticalLocation, ballWidth, ballHeight);
    }

    @Override
    public void mouseDragged(MouseEvent arg0) {


    }

    @Override
    public void mouseMoved(MouseEvent e) {

        //if we do not have a target yet - create one
        if (this.target == null)
        {
            target = new Point();
        }

        //set new values for our ball's target
        target.x = e.getX() - ballWidth / 2 - WINDOW_LEFT_BORDER_SIZE;
        target.y = e.getY() - ballHeight / 2 - WINDOW_TOP_BORDER_SIZE;
    }

}