import greenfoot.*;
public class PongGame extends World
{
    private int p1score;
    private int p2score;
    private Paddle leftPaddle;
    private Paddle rightPaddle;

    public PongGame()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        p1score = 0;
        p2score = 0;
        addBall();
        addScore();
        addPaddle(true);
        addPaddle(false);
    }

    public void addPaddle(boolean isLeft)
    {
        if (isLeft == true)
        {
            Paddle leftPaddle = new Paddle(true);
            leftPaddle.turn(270);
            addObject(leftPaddle, 40, 200);
        }
        else if (isLeft == false)
        {
            Paddle rightPaddle = new Paddle(false);
            rightPaddle.turn(270);
            addObject(rightPaddle, 560, 200);
        }
    }

    public void addBall()
    {
        Ball ball = new Ball(5);
        addObject(ball, 240, 200);
    }

    public void addScore()
    {
        Score score = new Score();
        addObject(score, 250, 50);
    }

    public int getP1score()
    {
        return p1score;
    }

    public int getP2score()
    {
        return p2score;
    }

    public void setP1score(int score)
    {
        p1score = score;
    }

    public void setP2score(int score)
    {
        p2score = score;
    }

    public String toString(int p1score)
    {
        return Integer.toString(p1score);
    }
}

import greenfoot.*;
import java.awt.Font;

public class Score extends Actor
{
    private String points;
    
    public void act() 
    {
        setText(points);
    }

    public Score()
    {
        PongGame world = (PongGame) getWorld();
        int p1score = world.getP1score();
        int p2score = world.getP2score();
        points = p1score + "\t" + p2score;
        GreenfootImage image = new GreenfootImage(150, 20);
        float fontSize = 12f;
        image.setColor(Color.WHITE);
        image.drawString(points, 2, 15);
        setImage(image);
    }

    public void checkForScore()
    {
        PongGame world = (PongGame) getWorld();
        int margin = getImage().getWidth() / 2;
        if (getX() - margin <= 0)
        {
            int p2score = world.getP2score();
            p2score++;
            world.setP2score(p2score);
        }
        else if (getX() + margin >= 600)
        {
            int p1score = world.getP1score();
            p1score++;
            world.setP1score(p1score);
        }
        setText(points);
    }
    
    public void setText(String text)
    {
        GreenfootImage image = getImage();
        image.clear();
        image.drawString(text, 2, 20);
    }
}

import greenfoot.*;
public class Ball extends Actor
{
    private int moveX;
    private int moveY;
    public void act() 
    {
        move();
        bounce();
        checkForScore();
    }

    public Ball()
    {
        moveX = 5;
        moveY = 5;
    }

    public Ball(int speed)
    {
        moveX = speed;
        moveY = speed;
    }

    public void move()
    {
        int newX = getX() + moveX;
        int newY = getY() + moveY;
        setLocation(newX, newY);
    }

    public boolean checkForScore()
    {
        PongGame world = (PongGame) getWorld();
        int margin = getImage().getWidth() / 2;
        if (getX() - margin <= 0)
        {
            int p2score = world.getP2score();
            p2score++;
            world.setP2score(p2score);
            world.removeObject(this);
            world.addBall();
            return true;
        }
        else if (getX() + margin >= 600)
        {
            int p1score = world.getP1score();
            p1score++;
            world.setP1score(p1score);
            world.removeObject(this);
            world.addBall();
            return true;
        }
        else
        {
            return false;
        }
    }

    public void bounce()
    {
        int margin = getImage().getHeight() / 2;
        if (getY() - margin <= 0 || getY() + margin >= 400)
        {
            moveY = -moveY;
        }
        if (isTouching(Paddle.class) == true)
        {
            moveX = -moveX;
        }
    }
}

import greenfoot.*;
public class Paddle extends Actor
{
    private boolean left;
    private int moveDistance;
    public void act() 
    {
        move();
    }

    public Paddle(boolean isLeft)
    {
        left = isLeft;
        moveDistance = 5;
    }

    public Paddle(boolean isLeft, int speed)
    {
        left = isLeft;
        moveDistance = speed;
    }

    public void move()
    {
        if (left == true)
        {
            if (Greenfoot.isKeyDown("w"))
            {
                move(moveDistance);
            }
            else if (Greenfoot.isKeyDown("s"))
            {
                move(-moveDistance);
            }
        }
        else
        {
            if (Greenfoot.isKeyDown("up"))
            {
                move(moveDistance);
            }
            else if (Greenfoot.isKeyDown("down"))
            {
                move(-moveDistance);
            }
        }
    }

    public void moveLeft()
    {
        if (Greenfoot.isKeyDown("w") )
        {
            move(moveDistance);
        }
        else if (Greenfoot.isKeyDown("s"))
        {
            move(-moveDistance);
        }
    }

    public void moveRight()
    {
        if (Greenfoot.isKeyDown("up"))
        {
            move(moveDistance);
        }
        else if (Greenfoot.isKeyDown("down"))
        {
            move(-moveDistance);
        }
    }
}