using UnityEngine;
using System.Collections;

namespace DevelopEngine
{
	public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
	{
		private static T instance = null;
		public static T Instance {
			get {
				if (instance == null)
				{
					instance = FindObjectOfType(typeof(T)) as T;
					if (instance == null)
					{
						instance = new GameObject("_" + typeof(T).Name).AddComponent<T>();
						DontDestroyOnLoad(instance);
					}
					if (instance == null)
						Console.LogError("Failed to create instance of " + typeof(T).FullName + ".");
				}
				return instance;
			}
		}
		
		void OnApplicationQuit () { if (instance != null) instance = null; }
		
		public static T CreateInstance ()
		{
			if (Instance != null) Instance.OnCreate();
			return Instance;
		}
		
		protected virtual void OnCreate ()
		{
			
		}
	}
    /// <summary>
    /// 无DontDestroyOnLoad属性的单例泛型模板
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class SingletonMono<T> : MonoBehaviour where T : SingletonMono<T>
    {
        private static T instance = null;
        public static T Instance
        {
            get
            {
                if (instance == null)
                {
                    instance = FindObjectOfType(typeof(T)) as T;
                    if (instance == null)
                    {
                        instance = new GameObject("_" + typeof(T).Name).AddComponent<T>();
                        //DontDestroyOnLoad(instance);
                    }
                    if (instance == null)
                        Console.LogError("Failed to create instance of " + typeof(T).FullName + ".");
                }
                return instance;
            }
        }

        void OnApplicationQuit() { if (instance != null) instance = null; }

        public static T CreateInstance()
        {
            if (Instance != null) Instance.OnCreate();
            return Instance;
        }

        protected virtual void OnCreate()
        {

        }
    }
}