using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;

public class ObjectPool : MonoBehaviour
{
    public static ObjectPool instance;
    public static Dictionary<string, List<GameObject>> pool = new Dictionary<string, List<GameObject>>();

    void Awake(){
        pool = new Dictionary<string, List<GameObject>>();
        instance= this;
    }

    public static GameObject Spawn(GameObject obj, Vector3 position, int ttl = 0){
        if(pool.ContainsKey(obj.name)){
            // Debug.Log($"Has key : {pool[obj.name].Count}");
            //use from pool
            if(pool[obj.name].Count <=0){
                GameObject go = Instantiate(obj, position, Quaternion.identity);
                return go;
            }else{
                GameObject chosen = pool[obj.name][0].gameObject;
                chosen.gameObject.SetActive(true);
                chosen.transform.position = position;
                pool[obj.name].RemoveAt(0);
                // Debug.Log("Reusing");
                if (ttl > 0)
                {
                    Deactivate(chosen, ttl);
                }
                return chosen;
            }
        }else{
            GameObject go = Instantiate(obj, position, Quaternion.identity);
            if(ttl > 0) { Deactivate(go, ttl);}
            return go;
        }
    }

    async static void Deactivate(GameObject go, int ttl)
    {
        await Task.Delay(ttl);

        Despawn(go);
    }

    public static void Despawn(GameObject obj){
        string objName = obj.name.Replace("(Clone)","");
        if(!pool.ContainsKey(objName)){
         pool.Add(objName, new List<GameObject>());
        }

        pool[objName].Add(obj);

        obj.SetActive(false);

        // Debug.Log($"Adding {objName} back to pool, " + pool[objName].Count);
    } 
}