using UnityEngine;
using System.Collections.Generic;

namespace packt.FoodyGO.Managers
{
    public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour
    {
        private static T _instance;

        public static T Instance
        {
            get
            {
                if (_instance == null)
                {
                    var type = typeof(T);
                    var objects = FindObjectsOfType<T>();

                    if (objects.Length > 0)
                    {
                        _instance = objects[0];
                        if (objects.Length > 1)
                        {
                            Debug.LogWarning("There is more than one instance of Singleton of type \"" + type + "\". Keeping the first. Destroying the others.");
                            for (var i = 1; i < objects.Length; i++)
                                DestroyImmediate(objects[i].gameObject);
                        }
                        return _instance;
                    }

                    var gameObject = new GameObject();
                    gameObject.name = type.ToString();

                    _instance = gameObject.AddComponent<T>();
                    DontDestroyOnLoad(gameObject);
                }
                return _instance;
            }
        }
    }
    
}