/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*\
|                                                               |
|          Made by Jason Helman © Jason Tech And Games          |
|   I do not condone the use of my work without my permission   |
|                                                               |
\*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

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

public class ObjectPool : MonoBehaviour
{
    public GameObject obj;
    public int maxAmount;

    private List<GameObject> objs;
    // private List<GameObject> objsOverflow;

    void Start ()
    {
        for(int i = 0; i < maxAmount; i++)
        {
            GameObject objRef = Instantiate(obj, Vector3.zero, Quaternion.identity, transform);
            objRef.SetActive(false);
            objs.Add(objRef);
        }
    }

    public GameObject Instantiate(Vector3 pos)
    {
        GameObject go;
        int val = -1;
        for(int i = 0; i < objs.Count; i++)
        {
            if(objs[i].activeSelf == false)
            {
                val = i;
                break;
            }
        }
        if (val == -1)
        {
            go = Instantiate(obj, pos, Quaternion.identity, transform);
            // objsOverflow.Add(go);
        }
        else
        {
            objs[val].transform.position = pos;
            go = objs[val];
        }

        return go;
    }

    public void Destroy(/*ref*/ GameObject obj)
    {
        // objs.Find(obj);
        int val = -1;
        for(int i = 0; i < objs.Count; i++)
        {
            if(objs[i].Equals(obj))
            {
                val = i;
                break;
            }
        }
        if(val == -1)
        {
            Destroy(obj);
        }
        else
        {
            objs[val].SetActive(false);
        }
    }

    public IEnumerator Destroy( /*Ref<GameObject>*/ GameObject obj, float delay)
    {
        // Invoke("Destroy(obj)", delay);
        // Wait(obj, delay);

        yield return new WaitForSeconds(delay);
        Destroy(obj/*.Value*/);
    }

    /*private IEnumerator Wait(GameObject obj, float delay)
    {
        yield return new WaitForSeconds(delay);
        Destroy(obj);
    }*/
}
/*
public class Ref<T>
{
    private T backing;
    public T Value { get { return backing; } }
    public Ref(T reference)
    {
        backing = reference;
    }
}
*/