import greenfoot.*;

public class EnemyDeathEffect extends Actor
{
    private GreenfootImage[] frames;
    private int frameInterval = 5;
    private int currentFrame = 0;
    private int frameCounter = 0;
    private boolean fadingOut = false;
    private int fadeSteps = 20;
    private int fadeCounter = 0;
    private GreenfootImage originalImage;

    public EnemyDeathEffect()
    {
        frames = new GreenfootImage[] 
        {
            new GreenfootImage("splat1.png"),
            new GreenfootImage("splat2.png"),
            new GreenfootImage("splat3.png"),
            new GreenfootImage("splat4.png")
        };
        setImage(frames[0]);
    }

    public void act()
    {
        if (!fadingOut)
        {
            frameCounter++;
            if (frameCounter >= frameInterval)
            {
                frameCounter = 0;
                currentFrame++;
                if (currentFrame >= frames.length)
                {
                    //start fading out
                    fadingOut = true;
                    currentFrame = frames.length - 1;
                    originalImage = new GreenfootImage(frames[currentFrame]); //clone once
                    setImage(new GreenfootImage(originalImage)); //set a fresh copy
                }
                else
                {
                    setImage(frames[currentFrame]);
                }
            }
        }
        else
        {
            fadeCounter++;
            float alphaRatio = 1.0f - ((float)fadeCounter / fadeSteps);
            if (alphaRatio < 0) 
            {
                alphaRatio = 0;
            }

            GreenfootImage img = new GreenfootImage(originalImage); //reuse original
            img.setTransparency((int)(255 * alphaRatio));
            setImage(img);

            if (fadeCounter >= fadeSteps)
            {
                if (getWorld() != null)
                {
                    getWorld().removeObject(this);
                }
            }
        }
    }
}