using Cysharp.Threading.Tasks;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
using YooAsset;

public class ScenesManager : MonoBehaviour
{
    public static ScenesManager Instance { get; private set; }

    private AsyncOperation ao;
    public SceneHandle handle;
    //测试
    private Image panel;
    private Image progress;
    private Text loading;
    //测试

    private void Awake()
    {
        Instance = this;
    }

    private void Update()
    {
        if (/*SceneManager.GetActiveScene().name == "LoadingScene" && */progress == null && loading == null)
        {
            GameObject canvas = GameObject.Find("UIRoot").gameObject;
            panel = canvas.transform.Find("LoadingPanel").GetComponent<Image>();
            progress = panel.transform.Find("LoadingBar/LoadingProgress").GetComponent<Image>();
            loading = panel.transform.Find("ProgressTxt").GetComponent<Text>();
        }

        //LoadingInProgress();
        YooAssetLoadingProgress();
    }

    /// <summary>
    /// 通过YooAsset加载场景
    /// </summary>
    /// <param name="sceneName"></param>
    /// <returns></returns>
    public async UniTask SceneLoadByYooAsset(string sceneName)
    {
        await YooAssetManager.Instance.LoadScene(sceneName);
    }

    /// <summary>
    /// YooAsset加载过程
    /// </summary>
    void YooAssetLoadingProgress()
    {
        if (handle != null)
        {
            //Debug.Log(handle.Progress);
            if (progress != null)
            {
                progress.fillAmount = handle.Progress;//
                loading.text = (int)((handle.Progress) * 100) + "%";//
            }

            if (handle.Progress >= 0.9f)
            {
                if (progress != null)
                {
                    progress.fillAmount = 1;//
                    loading.text = 100 + "%";//
                }

                handle.UnSuspend();
                UIManager.Instance.HideUI(WindowID.LoadingPanel);
                SceneManager.sceneLoaded += StepAdd;
            }
        }
    }


    /// <summary>
    /// 场景加载+SceneName
    /// </summary>
    /// <param name="sceneName"></param>
    public void SceneLoad(string sceneName)
    {
        StartCoroutine(SceneLoadCoroutine(sceneName));
    }
    /// <summary>
    /// 场景加载+index
    /// </summary>
    public void SceneLoad()
    {
        StartCoroutine(SceneLoadCoroutine());
    }
    /// <summary>
    /// 场景加载+SceneName(协程封装)
    /// </summary>
    /// <param name="sceneName"></param>
    public IEnumerator SceneLoadCoroutine(string sceneName)
    {
        if (SceneManager.GetActiveScene().name == "GetInitPos")
        {
            SceneManager.LoadScene("LoadingScene");
        }

        yield return new WaitForSeconds(2f);
        AsyncLoadScene(sceneName);
    }
    /// <summary>
    /// 场景加载+index(协程封装)
    /// </summary>
    public IEnumerator SceneLoadCoroutine()
    {
        int index = SceneManager.GetActiveScene().buildIndex + 1;
        if (SceneManager.GetActiveScene().name == "GetInitPos" )
        {
            SceneManager.LoadScene("LoadingScene");
        }

        yield return new WaitForSeconds(2f);
        AsyncLoadScene(index);

    }
    /// <summary>
    /// 异步加载场景+index
    /// </summary>
    /// <param name="sceneName"></param>
    public void AsyncLoadScene(int index)
    {
        ao = SceneManager.LoadSceneAsync(index);
        ao.allowSceneActivation = false;
    }
    /// <summary>
    /// 异步加载场景+SceneName
    /// </summary>
    /// <param name="sceneName"></param>
    public void AsyncLoadScene(string sceneName)
    {
        ao = SceneManager.LoadSceneAsync(sceneName);
        ao.allowSceneActivation = false;
    }

    /// <summary>
    /// 加载过程
    /// </summary>
    private void LoadingInProgress()
    {
        if(ao != null && ao.allowSceneActivation == false)
        {
            if (progress != null)
            {
                progress.fillAmount = ao.progress;//
                loading.text = (int)(ao.progress * 100) + "%";//
            }

            if (ao.progress >= 0.9f)
            {
                if (progress != null)
                {
                    progress.fillAmount = 1;//
                    loading.text = 100 + "%";//
                }

                //if (GameObject.Find("GameManager").GetComponent<StepManager>())
                //{
                //    Destroy(GameObject.Find("GameManager").GetComponent<StepManager>());
                //}
                ao.allowSceneActivation = true;
                SceneManager.sceneLoaded += StepAdd;
            }
        }
        
    }
    /// <summary>
    /// 切换场景结束回调/StepManager重新赋值
    /// </summary>
    /// <param name="s"></param>
    /// <param name="sceneType"></param>
    public void StepAdd(Scene s, LoadSceneMode sceneType)
    {
        //if (!GameObject.Find("GameManager").GetComponent<StepManager>())
        //{
        //    GameObject.Find("GameManager").AddComponent<StepManager>();
        //}
        ao = null;
        handle = null;
    }

}