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

/**
 * Write a description of class Spaceship here.
 * 
 * @author Jannis Andrija Schnitzer
 * @version 2011-01-16
 */
public class Spaceship  extends QuantumObject
{
    /**
     * Act - do whatever the Spaceship wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() {
        super.act();
        for (int i = 0; i < N_GUNS; i++)
        {
            if (guns[i] != null)
                guns[i].tick();
        }
    }
    
    protected static int N_GUNS = 3;
    protected Gun[] guns;
    
    public Spaceship()
    {
        guns = new Gun[N_GUNS];
        guns[0] = null;
        guns[1] = null;
        guns[2] = null;
        
        // set height to some value, used for calculation of starting point
    }
    
    public void addGun(int position, Gun new_gun)
    {
        guns[position] = new_gun;
    }
    
    public void removeGun(int position)
    {
        guns[position] = null;
    }
    
    protected void fire() {
        int x = getX();
        int y = getY();
        World world = getWorld();
        for (int i = 0; i < N_GUNS; i++)
        {
            if (guns[i] != null)
            {
                Missile m = guns[i].missile();
                if (m != null)
                    world.addObject(m, x + guns[i].get_dx(), y - guns[i].get_dy());
                    // subtracting dy here because greenfoot has 0,0 at the top left corner
            }
        }
    }
}