using UnityEngine;
using System.Collections;

namespace BF
{
    public class MonoSingleton<T> : MonoBehaviour where T : Component
    {
        bool inited;

        static T instance;
        public static T Instance
        {
            get
            {
                if (instance == null)
                {
                    instance = FindObjectOfType(typeof(T)) as T;
                    if (instance == null)
                    {
                        var obj = new GameObject();
#if UNITY_EDITOR
                        obj.hideFlags = HideFlags.DontSave;
#else
                        obj.hideFlags = HideFlags.HideAndDontSave;
#endif
                        obj.name = typeof(T).ToString();
                        instance = (T)obj.AddComponent(typeof(T));
                    }
                    else
                    {
                        var ms = instance as MonoSingleton<T>;
                        ms.Init();
                    }
                }
                return instance;
            }
        }

        protected virtual void Init()
        {
            if (inited)
            {
                return;
            }
            inited = true;
        }

        protected virtual void Awake()
        {
            DontDestroyOnLoad(gameObject);
            if (instance == null)
            {
#if UNITY_EDITOR
                gameObject.hideFlags = HideFlags.DontSave;
#else
                gameObject.hideFlags = HideFlags.HideAndDontSave;
#endif
                gameObject.name = typeof(T).ToString();

                instance = this as T;
                var ms = instance as MonoSingleton<T>;
                ms.Init();
            }
        }
    }
}