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

/// <summary>
/// Object Pool
/// </summary>
public class ObjectPool : Singleton<ObjectPool>
{
   /// <summary>
   /// List of the objects to be pooled
   /// </summary>
   public List<GameObject> PrefabsForPool;
   
   /// <summary>
   /// List of the pooled objects
   /// </summary>
   private List<GameObject> _pooledObjects = new List<GameObject>();

   public GameObject GetObjectFromPool(string objectName)
   {
      // Try to get a pooled instance
      var instance = _pooledObjects.FirstOrDefault(obj => obj.name == objectName);
      
      // If we have a pooled instance already
      if (instance != null)
      {
         // Remove it from the list of pooled objects
         _pooledObjects.Remove(instance);
         
         // Enable it
         instance.SetActive(true);
         
         return instance;
      }
      
      // If we don't have a pooled instance
      var prefab = PrefabsForPool.FirstOrDefault(obj => obj.name == objectName);
      if (prefab != null)
      {
         // Create a new instance
         var newInstace = Instantiate(prefab, Vector3.zero, Quaternion.identity, transform);
         
         // Make sure you set it's name (so you remove the Clone that Unity ads)
         newInstace.name = objectName;
         
         // Set it's position to zero
         newInstace.transform.localPosition = Vector3.zero;
         
         return newInstace;
      }
      
      Debug.LogWarning("Object pool doesn't have a prefab for the object with name " + objectName);
      return null;
   }

   public void PoolObject(GameObject obj)
   {
      // Disable the object
      obj.SetActive(false);
      
      // Add it to the list of pooled objects
      _pooledObjects.Add(obj);
   }
}