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

/**
 * Write a description of class PreyPopulation here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class PreyPopulation extends World
{
    int prePop, preMut, preHung, preRep;
    /**
     * Constructor for objects of class PreyPopulation.
     * 
     */
    public PreyPopulation()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        prePop = Integer.parseInt(Greenfoot.ask("How many population at the start?"));
        preMut = Integer.parseInt(Greenfoot.ask("How much mutation rate?"));
        preHung = Integer.parseInt(Greenfoot.ask("How much hunger?"));
        preRep = Integer.parseInt(Greenfoot.ask("How much reproduction?"));
    }
    public int getPrePop()
    {
        return prePop;
    }
    public void act()
    {
        if(Greenfoot.isKeyDown("Enter")) Greenfoot.setWorld(new MyWorld());
    }
}

public class MyWorld extends World
{
    /**
     * Constructor for objects of class MyWorld.
     * 
     */
    int preyPop, preyMut, preyHung, preyRep;
    int predatorPopulation = 15;
    int plantCounter = 1;
    int gameEnd = 60;
    public MyWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        preyPop = Integer.parseInt(Greenfoot.ask("How many population at the start?"));
        preyMut = Integer.parseInt(Greenfoot.ask("How much mutation rate?"));
        preyRep = Integer.parseInt(Greenfoot.ask("How much reproduction?"));
        for (int i = 0; i < 100; i++)
        {
            setUp(new Plant());
        }
        for (int i = 0; i < preyPop; i++)
        {
            setUp(new Prey());
        }
        for (int i = 0; i < predatorPopulation; i++)
        {
            setUp(new Predator());
        }
    }
    private void setUp(Actor object)
    {   
        int x = Greenfoot.getRandomNumber(600); 
        int y = Greenfoot.getRandomNumber(400); 
        addObject(object,x,y); 
    }
    public void act()
    {
        plantCheck();
        checkExtinct();
    }
    public void plantCheck()
    {
        plantCounter -= 1;
        if(plantCounter == 0)
        {
            setUp(new Plant());
            plantCounter = 1;
        }
    }
    public void checkExtinct()
    {
        if(getObjects(Predator.class).isEmpty())
        {
            Greenfoot.setWorld(new GameOver());   
        }
        if(getObjects(Prey.class).isEmpty())
        {
            Greenfoot.setWorld(new GameOver());
        }
    }
    public void getPrePop()
    {
        PreyPopulation world = (PreyPopulation)getWorld();
        world.getPrePop();
        
    }
    public int getPreyMut()
    {
        return preyMut;
    }
}

int receivedMut;
int mutation = Greenfoot.getRandomNumber(getMutation()) + 1;

public int getMutation()
    {
        MyWorld world = (MyWorld) getWorld();
        int receivedMut = world.getPreyMut();
        return receivedMut;
    }