import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

public class MainBall extends SmoothMover
{
    private static final int RADIUS = 12;
    //Colliding balls and gravity. I can make a game where the ball breaks blocks.
    //Fill up a water container, the paddle hits balls.
    //More than one level.
    //Make a pinball game.
    //Round objects bouncing off round objects.
    
    //Make powerups.
    
    //If bullets is more than 0, I can shoot.
    //REMEMBER TO ADD GRAVITY.
    
    public MainBall()
    {
        int angle = Greenfoot.getRandomNumber(360);
        double velocity = Greenfoot.getRandomNumber(100) / 10.0 + 10.0;
        addForce(new Vector(angle, velocity));
    }
    
    public void act() 
    {
        move();
        accelerate(0.99);
        bounceOffWall();
        bounceOffBalls();
        bounceOffPaddle();
    }    
    
    public void bounceOffBalls()
    {
        Ball ball = (Ball)getOneIntersectingObject(Ball.class);
        if(ball != null){
            if(touching(ball)){
                doCollision(ball);
            }
        }
        getWorld().removeObject(ball);
    }
    
    
    
    
    public void bounceOffPaddle()
    {
        Paddle paddle = (Paddle)getOneIntersectingObject(Paddle.class);
        if(paddle != null){
            if(touching(paddle)){
                doCollision(paddle);
            }
        }
    }
    

    

    
    public boolean touching(SmoothMover other)
    {
        double dx = other.getExactX()-this.getExactX();
        double dy = other.getExactY()-this.getExactY();
        return Math.sqrt(dx*dx+dy*dy)<=RADIUS*2;
        
    }
    
    
    public void doCollision(SmoothMover other)
    {
        double dx = other.getExactX()-this.getExactX();
        double dy = other.getExactY()-this.getExactY();
        int angle = (int) Math.toDegrees(Math.atan2(dy,dx));
        double force = Math. abs(this.getSpeed()-other.getSpeed());
        other.addForce(new Vector(angle,force));
        this.addForce(new Vector(angle +180, force));
    }
    
    public void bounceOffWall()
    {
        if(getExactX() <= RADIUS || getExactX() >= getWorld().getWidth()-RADIUS){
            getMovement().revertHorizontal();
            move();
        }
        if(getExactY() <= RADIUS || getExactY() >= getWorld().getHeight()-RADIUS){
            getMovement().revertVertical();
            move();
        }
    }
}