using UnityEngine;
using UnityEngine.Pool;
public sealed class PrefabPoolLab : MonoBehaviour
{
    [SerializeField] private GameObject inactivePrefab;
    private ObjectPool<GameObject> pool;
    private void Awake()
    {
        if (inactivePrefab == null || inactivePrefab.activeSelf)
        { Debug.LogError("Assign a prefab whose root is inactive.", this); enabled = false; return; }
        pool = new ObjectPool<GameObject>(
            () => Instantiate(inactivePrefab, transform),
            item => { item.transform.localPosition = Vector3.zero; item.SetActive(true); },
            item => item.SetActive(false),
            item => { if (item != null) Destroy(item); },
            true, 4, 16);
    }
    [ContextMenu("Rent And Return")]
    public void RentAndReturn()
    {
        if (!Application.isPlaying || pool == null) return;
        GameObject item = pool.Get();
        Debug.Log("Borrowed instance: " + item.GetInstanceID(), item);
        pool.Release(item);
        Debug.Log("Created=" + pool.CountAll + ", Inactive=" + pool.CountInactive, this);
    }
    private void OnDestroy() { if (pool != null) pool.Dispose(); }
}