using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.Networking;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class LoadNight : MonoBehaviour
{
    public GameObject objXMZJ_Scene2;

    public GameObject objBtnReturn;

    bool loading;

    private void OnMouseDown()
    {
        if (!loading)
        {
            loading = true;

            string sceneName = "XMZJ_Scene2_2";

            string abName = Application.isEditor ? sceneName + "_win" : sceneName;

            string abPath = Application.streamingAssetsPath + "/Bundles/" + abName + ".unity3d";

            StartCoroutine(LoadAssetBundle_Scene(abPath, sceneName, scene2_2Loaded));
        }
    }

    GameObject objReturn;
    void scene2_2Loaded()
    {
        objXMZJ_Scene2.SetActive(false);
        objBtnReturn.SetActive(true);

        objReturn = GameObject.Find("BtnXMZJReturn");
        if (objReturn != null)
        {
            objReturn.SetActive(false);
        }

        SetCameraPosition();

        loading = false;
    }

    public void Return()
    {
        objXMZJ_Scene2.SetActive(true);
        objBtnReturn.SetActive(false);
        if (currentSceneName != null)
        {
            currentSceneBundle.Unload(true);
            SceneManager.UnloadSceneAsync(currentSceneName);
        }
        if (objReturn != null)
        {
            objReturn.SetActive(true);
        }

        SetCameraPosition();
    }

    /// <summary>
    /// 加载进度条
    /// </summary>
    public Slider sliderProgress;

    /// <summary>
    /// 显示进度条
    /// </summary>
    void ShowSlider()
    {
        if (sliderProgress.value != 1)
        {
            sliderProgress.gameObject.SetActive(true);
        }
    }

    AssetBundle oldSceneBundle;
    AssetBundle currentSceneBundle;
    string oldSceneName;
    string currentSceneName;
    public IEnumerator LoadAssetBundle_Scene(string abPath, string sceneName,
    UnityAction BundleLoaded = null, LoadSceneMode mode = LoadSceneMode.Additive)
    {
        sliderProgress.value = 0;
        ShowSlider();

        // Caching.ClearCache();

        UnityWebRequest download = UnityWebRequestAssetBundle.GetAssetBundle(abPath);
        download.SendWebRequest();
        while (!download.isDone)
        {
            sliderProgress.value = download.downloadProgress;
            yield return null;
        }
        yield return download;

        oldSceneBundle = currentSceneBundle;
        currentSceneBundle = DownloadHandlerAssetBundle.GetContent(download);

        // 异步加载场景
        var sceneAsync = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Additive);
        currentSceneName = sceneName;
        while (!sceneAsync.isDone)
        {
            yield return null;
        }

        sliderProgress.value = 1;
        sliderProgress.gameObject.SetActive(false);

        if (BundleLoaded != null)
        {
            BundleLoaded();
        }

        oldSceneName = sceneName;
    }

    /// <summary>
    /// 设置摄像机在先民足迹场景中的默认位置
    /// </summary>
    void SetCameraPosition()
    {
        GameObject objSP = GameObject.Find("StartPosition2");
        if (objSP != null)
        {
            Camera cam = Camera.main;
            cam.gameObject.SetActive(false);
            cam.transform.position = objSP.transform.position;
            cam.transform.rotation = objSP.transform.rotation;
            cam.gameObject.SetActive(true);
        }
    }
}