using System;
using UnityEngine;

namespace NBC
{
    public class App : MonoBehaviour
    {
        public static App Inst { get; private set; }

        private static Scene _scene;
        public static Scene Main => _scene;
        private static event Action OnInitialized;

        public static event Action OnUpdate;
        public static event Action OnLateUpdate;
        public static event Action OnFixedUpdate;
        public static event Action OnApplicationQuitAction;
        public static event Action OnApplicationPauseAction;

        /// <summary>
        /// Scene下的事件系统组件
        /// </summary>
        public static UIComponent UI { get; internal set; }

        public static void Init(Action callback = null)
        {
            if (Inst != null) return;
            new GameObject("App").AddComponent<App>();
            OnInitialized += callback;
        }

        private void Awake()
        {
            Inst = this;
            DontDestroyOnLoad(gameObject);
        }

        private void Start()
        {
            StartAsync().Coroutine();
        }

        private void Update()
        {
            OnUpdate?.Invoke();
        }

        private void LateUpdate()
        {
            OnLateUpdate?.Invoke();
        }

        private void FixedUpdate()
        {
            OnFixedUpdate?.Invoke();
        }

        private void OnApplicationQuit()
        {
            OnApplicationQuitAction?.Invoke();
        }

        private void OnApplicationPause(bool pauseStatus)
        {
            OnApplicationPauseAction?.Invoke();
        }

        private void OnDestroy()
        {
            _scene?.Dispose();
        }

        private async FTask StartAsync()
        {
            // 初始化框架
            await NBC.Platform.Unity.Entry.Initialize(GetType().Assembly);
            _scene = await Scene.Create(SceneRuntimeMode.MainThread);
            UI = _scene.AddComponent<UIComponent>();
            OnInitialized?.Invoke();
        }
    }
}