using UnityEngine;

public class MonoSingleton<T> : MonoBehaviour where T : MonoBehaviour
{
    protected static T _instance = null;
    public static T Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = FindObjectOfType(typeof(T)) as T;
                if (_instance == null)
                {
                    GameObject obj = new GameObject(nameof(T));
                    _instance = obj.AddComponent<T>();
                }
                
                DontDestroyOnLoad(_instance.gameObject);
            }
            return _instance;
        }
    }

    public static bool IsNull()
    {
        if (_instance == null)
        {
            _instance = FindObjectOfType(typeof(T)) as T;
        }
        return _instance == null;
    }

    public static void RemoveInstance()
    {
        if (_instance == null)
            return;
        _instance = null;
    }
}