import greenfoot.*;
import java.util.*; // For Lists

/**
 * Write a description of class LaserBeam here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class LaserBeam extends Actor
{
    /**
     * Constructs the LaserBeam, pointing in the right direction
     */
    public LaserBeam(int direction)
    {
        setRotation(direction);
    }
    
    /**
     * Act - do whatever the LaserBeam wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        // Add your action code here.
        move(10);
        
        // Vanish if we reach the edge of the world
        World choirWorld = getWorld();
        if (getX() <= 0 || getY() <= 0 || getX() >= choirWorld.getWidth() || getY() >= choirWorld.getHeight())
        {
            List<LaserCat> cats = choirWorld.getObjects(LaserCat.class);
            if (!cats.isEmpty())
            {
                LaserCat theCat = cats.get(0);
                theCat.resetLaser();
            }

            choirWorld.removeObject(this);
        }
        else 
        {
            // Check to see what we've hit
            // If it's the squeaker, remove them
            ChoirSinger choirSqueaker = (ChoirSinger)getOneIntersectingObject(ChoirSinger.class);  
          
            if (choirSqueaker != null && choirSqueaker.Squeak())
            {
                List<LaserCat> cats = choirWorld.getObjects(LaserCat.class);
                if (!cats.isEmpty())
                {
                    LaserCat theCat = cats.get(0);
                    theCat.resetLaser();
                }
                
                choirSqueaker.unblock();
                choirWorld.removeObject(choirSqueaker);
                choirWorld.removeObject(this);
            }
        }
    }    
}