import greenfoot.*;

/**
 * A rocket that can be controlled by the arrowkeys: up, left, right.
 * The gun is fired by hitting the 'space' key. 'z' releases a proton wave.
 * 
 * @author Poul Henriksen
 * @author Michael Kölling
 * 
 * @version 1.1
 */
public class Rocket extends SmoothMover
{
    private static final int gunReloadTime = 5;         // The minimum delay between firing the gun.
    private int reloadDelayCount;               // How long ago we fired the gun the last time.
    private static final int protonReloadTime = 20;
    private int protonDelayCount;
    private GreenfootImage rocket = new GreenfootImage("rocket.png");    
    private GreenfootImage rocketWithThrust = new GreenfootImage("rocketWithThrust.png");
    /**
     * Initialise this rocket.
     */
    public Rocket() {
        reloadDelayCount = 5;
        protonDelayCount = 20;
        setImage(rocket);
    }

    /**
     * Do what a rocket's gotta do. (Which is: mostly flying about, and turning,
     * accelerating and shooting when the right keys are pressed.)
     */
    public void act() {
        checkKeys();
        reloadDelayCount++;
        protonDelayCount++;
        move();
        checkAsteroidCollision();
    }
    
    public void checkAsteroidCollision() {
        Asteroid asteroid = (Asteroid)getOneIntersectingObject(Asteroid.class);
        if(asteroid !=null) {
            Explosion explosion = new Explosion();
            Space space = (Space) getWorld();
            space.addObject(explosion,getX(),getY());
            
            space.removeObject(this);
            
            int score=space.getCounter().getValue();
            ScoreBoard board=new ScoreBoard(score);
            space.addObject(board, space.getWidth()/2, space.getHeight()/2);        
        }
    }
    
    /**
     * Check whether there are any key pressed and react to them.
     */
    private void checkKeys() 
    {
        if (Greenfoot.isKeyDown("space")) {
            fire();
        }
        if (Greenfoot.isKeyDown("z")) {
            fireproton();
        }
        if (Greenfoot.isKeyDown("left")) {
            turn(-5);
        }
        if (Greenfoot.isKeyDown("right")) {
            turn(5);
        }
        if (Greenfoot.isKeyDown("up")) {
            int rotation = getRotation();
            addToVelocity(new Vector(rotation,1));
            setImage(rocketWithThrust);        
        }
        else {
            setImage(rocket);
        }
    }
    
    /**
     * Fire a bullet if the gun is ready.
     */
    private void fire() {
        if (reloadDelayCount >= gunReloadTime) {
            Bullet bullet = new Bullet (getVelocity(), getRotation());
            getWorld().addObject (bullet, getX(), getY());
            bullet.move ();
            reloadDelayCount = 0;
        }       
    }
     
    private void fireproton() {
        if (protonDelayCount >= protonReloadTime) {
            ProtonWave wave = new ProtonWave ();
            getWorld().addObject (wave, getX(), getY());
            protonDelayCount = 0;
        }            
    }
}