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 static final int protonTime = 60; 
    
    private int protonDelayCount;
    
    private int reloadDelayCount;               // How long ago we fired the gun the last time.
    
    private GreenfootImage rocket= new GreenfootImage("rocket.png");    
    private GreenfootImage rocketWithThrus= new GreenfootImage("rocketWithThrust.png");
    
    /**
     * Initialise this rocket.
     */
    public Rocket()
    {
        reloadDelayCount = 5;
        protonDelayCount = 60 ;
    }

    /**
     * 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();
        checkAsteroidHit();
    }
    
    /**
     * Check whether there are any key pressed and react to them.
     */
    private void checkKeys() 
    {
        if (Greenfoot.isKeyDown("space")) 
        {
            fire();
        }
        if (Greenfoot.isKeyDown("z")) {
            fireProtonWave();
        }
        if (Greenfoot.isKeyDown("left")) {
            turn(-15);
        }
        if (Greenfoot.isKeyDown("right")) {
            turn(15);
        }
        if (Greenfoot.isKeyDown("up")){
            setImage(rocketWithThrus);
            int degree = getRotation();
            Vector v = new Vector(degree,1.0);
            addToVelocity(v);
        }else {
            setImage(rocket);
        }
    }
    
    public void fireProtonWave(){
        if(protonDelayCount >= protonTime){
            ProtonWave pw = new ProtonWave();
            getWorld().addObject(pw, getX(), getY());
            protonDelayCount = 0;
        }
    }
    
    /**
     * 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 checkAsteroidHit()
    {
        Asteroid asteroid = (Asteroid) getOneIntersectingObject(Asteroid.class);
        if (asteroid != null)
        {
            Explosion explosion = new Explosion();
            Space space = (Space) getWorld();
            space.addObject(explosion, getX(), getY());
            
            getWorld().removeObject(this);
            
            int score = space.getCounter().getValue();
            ScoreBoard board = new ScoreBoard(score);
            space.addObject(board, 300, 250);
        }
    }
    
}