using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Accessibility;
using UnityEngine.SceneManagement;

public class SceneOverlayManager : MonoBehaviour
{
    public static SceneOverlayManager Instance;

    public string _normal_scene = "深圳市民中心_白天_HD";
    string _last_loaded_scene;

    private List<AsyncOperation> operations = new List<AsyncOperation>();

    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            if (Instance != this)
            {
                Debug.Log("warning: multiple Manager creating!");
                GameObject.Destroy(gameObject);
            }
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        //if (!string.IsNullOrEmpty(_normal_scene))
        //{
        //    LoadSceneAsync(_normal_scene);
        //}
        //if (GameInit.Instance == null)
        //    LoadSceneAsync("深圳市民中心_白天_HD", true, (_async) =>
        //    {
        //        LoadSceneAsync("无人机组件控制器", false);
        //    });
    }

    /// <summary>
    /// 异步加载场景
    /// </summary>
    /// <param name="_load_scene_name">场景名</param>
    /// <param name="_unload_last_scene">是否卸载上一个加载的场景</param>
    /// <param name="_load_complete_callback">加载完成回调事件</param>
    /// <param name="_unload_complete_callback">卸载完成回调事件</param>
    /// <param name="_load_scene_mode">加载模式</param>
    public void LoadSceneAsync(string _load_scene_name, bool _unload_last_scene = true, Action<AsyncOperation> _load_complete_callback = null, Action<AsyncOperation> _unload_complete_callback = null, LoadSceneMode _load_scene_mode = LoadSceneMode.Additive)
    {
        try
        {
            //卸载上一个场景
            if (_unload_last_scene)
            {
                if (!string.IsNullOrEmpty(_last_loaded_scene) && _load_scene_name != _last_loaded_scene)
                {
                    var _unload_async = SceneManager.UnloadSceneAsync(_last_loaded_scene);
                    _unload_async.completed += _unload_complete_callback;
                }
            }
        }
        catch (Exception e)
        {

        }

        //加载目标场景
        var _load_scene = SceneManager.GetSceneByName(_load_scene_name);
        if (_load_scene != null && !_load_scene.isLoaded)
        {
            var _load_async = SceneManager.LoadSceneAsync(_load_scene_name, _load_scene_mode);
            _load_async.completed += _load_complete_callback;
        }

        if (_unload_last_scene)
            _last_loaded_scene = _load_scene_name;
    }
}