WildRoot/Assets/Script/GameStep.cs

using UnityEngine;

public class NewMonoBehaviourScript : MonoBehaviour
{
    public GameObject[] spawners;
    public Rotator rotator;

    private GameManager gameManager;
    private int currentStep = 0;

    void Start()
    {
        gameManager = FindFirstObjectByType<GameManager>();

        InitializeDifficulty();
    }

    void Update()
    {
        if (gameManager == null) return;

        float currentTime = gameManager.GetSurviveTime();
        int targetStep = 1;

        if (currentTime > 30f) targetStep = 4;
        else if (currentTime > 20f) targetStep = 3;
        else if (currentTime > 10f) targetStep = 2;
        else targetStep = 1;

        if (currentStep != targetStep)
        {
            UpdateStep(targetStep);
        }
    }


    void InitializeDifficulty()
    {
        foreach (var s in spawners) s.SetActive(false);
        if (rotator != null) rotator.enabled = false;

        UpdateStep(1);
    }

    void UpdateStep(int step)
    {
        currentStep = step;
        switch (step)
        {
            case 1 :
                SetSpawnersActive(2);
                if (rotator != null) rotator.enabled = false;
                break;

            case 2 :
                SetSpawnersActive(4);
                break;

            case 3 :
                SetSpawnersActive(4);
                if (rotator != null) rotator.enabled = true;
                break;

            case 4:
                SetSpawnersActive(4);
                if (rotator != null) rotator.enabled = true;
                UpgradeBullSpeed(12f);
                break;
        }
    }

    void SetSpawnersActive(int count)
    {
        for(int i = 0; i < spawners.Length; i++)
        {
            spawners[i].SetActive(i < count);
        }
    }

    void UpgradeBullSpeed(float newSpeed)
    {
        foreach (var obj in spawners)
        {
            if (obj == null) continue;
            BulletSpawner spawner = obj.GetComponent<BulletSpawner>();
            if (spawner != null) spawner.bulletSpeed = newSpeed;
        }
    }
}