using UnityEngine;

namespace AibisDream.Kit
{
    public abstract class Singleton<T> : MonoBehaviour, ISingleton where T : Singleton<T>
    {
        public static T Instance { get; private set; }

        protected virtual void Awake()
        {
            if (Instance != null)
            {
                Destroy(gameObject);
            }
            else
            {
                Instance = (T)this;
                OnSingletonInit();
            }
        }

        public virtual void OnSingletonInit()
        {
        }

        public static bool IsInitialized => Instance != null;

        protected virtual void OnDestroy()
        {
            if (Instance == this)
            {
                Instance = null;
            }
        }
    }
}