Level1.java

import greenfoot.*;
import java.util.ArrayList;
import java.util.List;

public class Level1 extends World {
    private GreenfootImage bg;
    private GreenfootSound backgroundMusic;

    private int roomWidth = 700;
    private int roomHeight = 700;

    private Player player;
    private HealthBar healthBar;
    private Actor timeDisplay;

    private long startTime;
    private static final int GAME_TIME_LIMIT = 30 * 1000;
    private int remainingTime;

    private boolean gameWon = false;

    private int zombie4Count = 0, maxZombie4s = 5;
    private int zombie2Count = 0, maxZombie2s = 5;
    private int greatswordZombie4Count = 0, maxGreatswordZombie4s = 3;
    private int zombie3Count = 0, maxZombie3s = 2;

    private int zombie4Delay = 120; 
    private int zombie2Delay = 180;
    private int greatswordZombie4Delay = 250;
    private int zombie3Delay = 300;

    private int zombie4Timer = 0;
    private int zombie2Timer = 0;
    private int greatswordZombie4Timer = 0;
    private int zombie3Timer = 0;

    private ArrayList<int[]> portalPositions;

    public Level1() {
        super(700, 700, 1, false);
        bg = new GreenfootImage("background.png");
        setBackground(bg);

        backgroundMusic = new GreenfootSound("backsound.mp3");
        backgroundMusic.playLoop();

        startTime = System.currentTimeMillis();

        player = new Player();
        addObject(player, roomWidth / 2, roomHeight / 2);

        addWalls();

        healthBar = new HealthBar(player.getMaxHealth());
        addObject(healthBar, 130, 50);

        portalPositions = new ArrayList<>();
        addPortal(350, 30);
        addPortal(50, 300);
        addPortal(650, 300);

        timeDisplay = new Actor() { public void act() {} };
        addObject(timeDisplay, 150, 30);
    }

    private void addPortal(int x, int y) {
        Portal portal = new Portal();
        addObject(portal, x, y);
        if (x == 350 && y == 30) portal.setRotation(90);
        portalPositions.add(new int[]{x, y});
    }

    private void addWalls() {
        addObject(new Wall06(), 350, 20);
        addObject(new Wall07(), 350, 680);
        addObject(new Wall08(), 30, 350);
        addObject(new Wall09(), 670, 350);
    }

    public void act() {
        if (player == null) return;

        if (player.getHealth() <= 0 || player.isDead()) {
            gameOver();
            return;
        }
        if (System.currentTimeMillis() - startTime >= GAME_TIME_LIMIT) {
            victory();
            return;
        }

        healthBar.updateHealth(player.getHealth());
        remainingTime = (int) ((GAME_TIME_LIMIT - (System.currentTimeMillis() - startTime)) / 1000);
        updateTimeDisplay();

        handleSpawning();
    }

    private void handleSpawning() {
        zombie4Timer++;
        zombie2Timer++;
        greatswordZombie4Timer++;
        zombie3Timer++;

        if (zombie4Timer >= zombie4Delay && zombie4Count < maxZombie4s) {
            summonZombie4();
            zombie4Timer = 0;
        }

        if (zombie2Timer >= zombie2Delay && zombie2Count < maxZombie2s) {
            summonZombie2();
            zombie2Timer = 0;
        }

        if (greatswordZombie4Timer >= greatswordZombie4Delay && greatswordZombie4Count < maxGreatswordZombie4s) {
            summonGreatswordZombie4();
            greatswordZombie4Timer = 0;
        }

        if (zombie3Timer >= zombie3Delay && zombie3Count < maxZombie3s) {
            summonZombie3();
            zombie3Timer = 0;
        }
    }

    private void summonZombie4() {
        Zombie4 s = new Zombie4();
        int[] pos = portalPositions.get(Greenfoot.getRandomNumber(portalPositions.size()));
        addObject(s, pos[0], pos[1]);
        zombie4Count++;
    }

    private void summonZombie2() {
        Zombie2 z = new Zombie2();
        int[] pos = portalPositions.get(Greenfoot.getRandomNumber(portalPositions.size()));
        addObject(z, pos[0], pos[1]);
        zombie2Count++;
    }

    private void summonGreatswordZombie4() {
        Zombie1 g = new Zombie1();
        int[] pos = portalPositions.get(Greenfoot.getRandomNumber(portalPositions.size()));
        addObject(g, pos[0], pos[1]);
        greatswordZombie4Count++;
    }

    private void summonZombie3() {
        Zombie3 r = new Zombie3();
        int[] pos = portalPositions.get(Greenfoot.getRandomNumber(portalPositions.size()));
        addObject(r, pos[0], pos[1]);
        zombie3Count++;
    }

    public void stopped() {
        if (backgroundMusic != null) backgroundMusic.stop();
    }

    public void started() {
        if (backgroundMusic != null && !backgroundMusic.isPlaying()) backgroundMusic.playLoop();
    }

    private void gameOver() {
        backgroundMusic.stop();
        Greenfoot.setWorld(new GameOver());
    }

    private void victory() {
        backgroundMusic.stop();
        Greenfoot.setWorld(new Level2());
    }

    private void updateTimeDisplay() {
        GreenfootImage img = new GreenfootImage(220, 50);
        img.setColor(Color.WHITE);
        img.setFont(new Font(true, false, 20));
        img.drawString("Time: " + remainingTime + "s", 10, 30);
        timeDisplay.setImage(img);
    }
}