using System;
using Framework.Asset;
using Framework.Timer;
using UnityEngine;
using UnityEngine.SceneManagement;
using YooAsset;

namespace StateSystem.Loader
{
    public enum SceneName
    {
        //初始化入口
        InitScene,

        //主页面
        MainScene,

        //游戏场景
        GameScene
    }

    public class SceneLoader : ILoader
    {
        private readonly string        _targetScene;
        private          SceneHandle   _asyncLoader;
        private          Action        _onComplete;
        private          Action<float> _onLoading;
        private          TimeHandler   _actionTimer;
        public           bool          IsAutoLoad = false;

        public SceneLoader (string targetScene)
        {
            this._targetScene = targetScene;
        }

        public SceneLoader (SceneName targetScene, bool isAutoLoad = false)
        {
            this.IsAutoLoad   = isAutoLoad;
            this._targetScene = AssetManager.ResRootPath + "Scenes/" + targetScene.ToString () + ".unity";
            Debug.Log ("准备进入Scene： " + this._targetScene);
        }

        public void BeginLoad (Action<float> onLoading, Action onComplete)
        {
            this._onLoading   = onLoading;
            this._onComplete  = onComplete;
            this._asyncLoader = YooAssets.LoadSceneAsync (this._targetScene , LoadSceneMode.Single);
            GameUpdateMgr.Instance.AddUpdater (OnUpdate);
        }

        public void Active ()
        {
            Debug.Log ("ActiveScene");
            GameUpdateMgr.Instance.RemoveUpdater (OnUpdate);
            //最大超时3s后强制回调场景进入完成， 若期间_asyncLoader.progress >= 1 则表示已经进入场景
            this._actionTimer = GameUpdateMgr.Instance.CreateTimer (3, OnActive, CheckActiveState);
            this._asyncLoader.ActivateScene ();
        }

        private void CheckActiveState (float obj)
        {
            if (this._asyncLoader.Progress >= 1)
            {
                this._actionTimer.Kill ();
                OnActive ();
            }
        }

        private void OnActive ()
        {
            var onComplete = this._onComplete;
            this._onComplete = null;
            onComplete?.Invoke ();
        }

        private void OnUpdate ()
        {
            //Unity的异步加载在90%的时候会自动停止，除非开启自动跳转才会加载后续部分，因此在加载到90%时判断加载完成即可。
            var percent = this._asyncLoader.Progress;
            // Debug.Log("加载进度: " + percent);
            if (percent >= 0.9f)
            {
                GameUpdateMgr.Instance.RemoveUpdater (OnUpdate);
                this._onLoading?.Invoke (1);
                if (this.IsAutoLoad)
                {
                    Active ();
                }
            }
            else
            {
                this._onLoading?.Invoke (percent);
            }
        }

        private bool _isKill;

        public void Kill ()
        {
            if (!this._isKill)
            {
                this._isKill = true;
                this._actionTimer?.Kill ();
                GameUpdateMgr.Instance.RemoveUpdater (OnUpdate);
                // this._asyncLoader.UnloadAsync ();
            }
        }
    }
}