using System;
using Sirenix.OdinInspector;
using UnityEngine;

namespace UnityTest.ZXL
{
    /// <summary>
    /// 继承MonoBehavior的单例基类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class BaseAutoMono<T> : SerializedMonoBehaviour where T : MonoBehaviour
    {
        private static T instance;

        public static T Instance()
        {
            if (instance == null)
            {
                var findObjectsOfType = GameObject.FindObjectsOfType<T>();
                if (findObjectsOfType.Length > 1)
                {
                    throw new Exception($"{typeof(T)}' count is larger than 1");
                }

                if (findObjectsOfType.Length == 0)
                {
                    GameObject go = new GameObject();
                    go.name = typeof(T).ToString();
                    DontDestroyOnLoad(go);
                    instance = go.AddComponent<T>();
                }
                else
                {
                    instance = findObjectsOfType[0];
                }
            }

            return instance;
        }

        void Awake()
        {
            instance = this.gameObject.GetComponent<T>();
        }
    }
}