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

/**
 * Write a description of class MyWorld here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class MyWorld extends World
{
    // Defines the background image as a variable
    private Background scrollworld, scrollworld2;
    // Add healthbar as an object to the world
    private HealthBar healthbar = new HealthBar();
    private ScoreBoard score;

    public MyWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(980, 575, 1, false); 

        score = new ScoreBoard(this);
        prepare();

        // Sets order of actors in world
        setPaintOrder(Ship.class, Laser.class, Alien.class, Star.class, HealthBar.class, Background.class);

        // Adds background to world and sets it to the middle 
        scrollworld = new Background();
        addObject(scrollworld, getWidth()/2, getHeight()/2);

        // Continues the scrolling effect
        scrollworld2 = new Background(); 
        addObject(scrollworld2, getWidth() + getWidth()/2, getHeight()/2);
    }

    public void act() {
        // Allows background to move infinitely
        if (true) {
            scrollworld.scroll();
            scrollworld2.scroll(); 
        }
    }

    public HealthBar getHealthBar() {
        // Updates healthbar
        return healthbar;
    }

    private void prepare()
    {
        // Adds all objects to world
        
        WaveCounter wavecounter = new WaveCounter(score);
        addObject(wavecounter, 0, 0); 
        
        Ship ship = new Ship(score);
        addObject(ship,490,300);
        
        addObject(healthbar,100,550);
        
        BigAlien bigalien = new BigAlien();
        addObject(bigalien, 900, 100);
        BigAlien bigalien2 = new BigAlien();
        addObject(bigalien2, 900, 500);
        BigAlien bigalien3 = new BigAlien();
        addObject(bigalien3, 100, 500);
        BigAlien bigalien4 = new BigAlien();
        addObject(bigalien4, 100, 100);
    }

    
}