using System;

using System.Collections.Generic;

using System.Linq;

using System.Numerics;

using System.Text;

using System.Threading.Tasks;

namespace ObjectPoolExample

{

internal class ObjectPool<T> where T : GameObject

{

T prefab;

bool autoExpand = false;

List<T> pool;

GameObject container = null;

public ObjectPool(T _prefab, int _count, bool _autoExpand = false)

{

prefab = _prefab;

autoExpand = _autoExpand;

CreatePool(_count);

}

public ObjectPool(T _prefab, int _count, GameObject _container, bool _autoExpand = false)

{

prefab = _prefab;

autoExpand = _autoExpand;

container = _container;

CreatePool(_count);

}

public void CreatePool(int _count)

{

pool = new List<T>();

for (int i = 0; i < _count; i++)

{

CreateObject(false);

}

}

private T CreateObject(bool _activeSelf)

{

var obj = (T)new GameObject(prefab);

obj.SetActive(_activeSelf);

obj.SetParent(container);

pool.Add(obj);

return obj;

}

public T GetFreeElement()

{

var gameObject = pool.Find(x => x.activeSelf == false);

if(gameObject != null)

{

gameObject.SetActive(true);

return gameObject;

}

if(autoExpand)

{

return CreateObject(true);

}

Console.WriteLine($"[ERROR] - Pool don't have any other free elements of {typeof(T).Name}");

return null;

}

public override string ToString()

{

var stringBuilder = new StringBuilder();

stringBuilder.AppendLine("Active Elements:");

var activeObjects = pool.FindAll(x => x.activeSelf == true);

foreach (T obj in activeObjects)

{

stringBuilder.AppendLine(obj.ToString());

}

stringBuilder.AppendLine($"Count of active objects: {activeObjects.Count}");

stringBuilder.AppendLine($"Total count objects: {pool.Count}");

return stringBuilder.ToString();

}

}

}