import objectdraw.*;
import java.util.Random;
import java.awt.Color;

// a ball in a game of pong
public class PongBall extends ActiveObject {

    // size of the ball
    private static final int BALL_SIZE = 30;

    // pause time in between movements
    private static final int PAUSE_TIME = 10;

    private double xspeed;
    private double yspeed;

    private FilledOval ball;

    private DrawingCanvas canvas;

    private FramedRect court;

    private FilledRect paddle;

    public PongBall(Location point, FramedRect court, FilledRect paddle, DrawingCanvas canvas) {
        ball = new FilledOval(point, BALL_SIZE, BALL_SIZE, canvas);
        this.canvas = canvas;
        this.court = court;
        this.paddle = paddle;

        Random rand = new Random();
        yspeed = rand.nextDouble() + 1;
        if (rand.nextBoolean()) {
            yspeed = -yspeed;
        }
        xspeed = rand.nextDouble() + 1;
        if (rand.nextBoolean()) {
            xspeed = -xspeed;
        }

        start();
    }

    public void run() {

        // move the ball repeatedly until it falls off screen
        while (ball.getY() < canvas.getHeight()) {
            ball.move(xspeed, yspeed);

            if (ball.overlaps(paddle) || ball.getY() < court.getY()){
                yspeed = -yspeed;
            }

            if (ball.getX() < court.getX()
                    || ball.getX() > court.getX() + court.getWidth() - ball.getWidth()) {
                xspeed = -xspeed;
            }
            
            pause(PAUSE_TIME);
        }

        ball.removeFromCanvas();
    }

}