lsh4/Assets/Scripts/Monsters/MonsterGroupManager.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class MonsterGroupManager : MonoBehaviour
{
    public MonsterData monsterType;
    public int numberOfMonsters = 5;
    public float respawnTime = 300f; // 5 min
    public Vector3 spawnCenter;
    public float spacing = 1.5f;

    private List<GameObject> spawnedMonsters = new();
    private bool isRespawning = false;

    void Start()
    {
        SpawnMonsters();
    }

    public void SpawnMonsters()
    {
        for (int i = 0; i < numberOfMonsters; i++)
        {
            Vector3 spawnPos = spawnCenter + new Vector3((i % 3) * spacing, 0, -(i / 3) * spacing);
            GameObject m = Instantiate(monsterType.prefab, spawnPos, Quaternion.identity);
            MonsterController ctrl = m.GetComponent<MonsterController>();
            ctrl.data = monsterType;
            ctrl.Setup(this);
            spawnedMonsters.Add(m);
        }
    }

    public void OnMonsterDefeated(GameObject monster)
    {
        spawnedMonsters.Remove(monster);
        Destroy(monster);

        if (!isRespawning && spawnedMonsters.Count == 0)
            StartCoroutine(RespawnDelay());
    }

    IEnumerator RespawnDelay()
    {
        isRespawning = true;
        yield return new WaitForSeconds(respawnTime);
        SpawnMonsters();
        isRespawning = false;
    }
}