using System.Collections;
using System.IO;
using Blue;
#if UNITY_EDITOR
using UnityEditor;
#endif
using UnityEngine;
using UnityEngine.Networking;

public class DownloadPointFile : AbstractController
{
    private UnityWebRequest webRequestPointByte;
    private UnityWebRequest webRequestPointJson;
    private void Awake()
    {
        this.SubscribeEvent<DownLoadMapFileEvent>(Download).UnSubScribeWhenGameObjectDestroyed(gameObject);
    }

    private void Download(DownLoadMapFileEvent e)
    {
        if (e.FileType == "json")
            StartCoroutine(DownLoadFile(webRequestPointJson, e.Url, "." + e.FileType, e.ProjectID.ToString()));
        else
            StartCoroutine(DownLoadFile(webRequestPointByte, e.Url, "." + e.FileType, e.ProjectID.ToString()));
    }
    private IEnumerator DownLoadFile(UnityWebRequest webRequestPoint, string downloadingUrl, string fileType, string projectId)
    {
        string fileName = this.GetUtility<GetFileNameUtility>().GetFileName(downloadingUrl, fileType);

        if (!PlayerPrefs.HasKey(projectId+ fileType) || 
            PlayerPrefs.GetString(projectId+ fileType) != fileName||
            !File.Exists(Application.persistentDataPath + "/Map Data/" + fileName))
        {
            PlayerPrefs.SetString(projectId+ fileType, fileName);
            Debug.LogError("文件不存在，下载文件");
            //发送请求
            webRequestPoint = UnityWebRequest.Get(downloadingUrl);
            webRequestPoint.timeout = 30;//设置超时，若webRequest.SendWebRequest()连接超时会返回，且isNetworkError为true
            yield return webRequestPoint.SendWebRequest();

            if (webRequestPoint.result == UnityWebRequest.Result.ConnectionError) Debug.Log("Download Point Cloud Error:" + webRequestPoint.error);
            else
            {
                if (Directory.Exists(Application.persistentDataPath + "/Map Data") == false)
                    Directory.CreateDirectory(Application.persistentDataPath + "/Map Data");
                if (System.IO.File.Exists(Application.persistentDataPath + "/Map Data/" + fileName))
                    System.IO.File.Delete(Application.persistentDataPath + "/Map Data/" + fileName);
                //获取二进制数据
                var File = webRequestPoint.downloadHandler.data;
                //创建文件写入对象
                FileStream nFile = new FileStream(Application.persistentDataPath + "/Map Data/" + fileName, FileMode.Create);
                //写入数据
                nFile.Write(File, 0, File.Length);
                //关闭当前流并释放与之相关联的所有系统资源
                nFile.Close(); nFile.Dispose(); nFile = null;
                if (fileType == ".bytes")
                {
#if UNITY_EDITOR
                    AssetDatabase.Refresh();
#endif
                    this.SendCommand(new LoadMapFileCommand(fileName) { });
                }
            }
        }
        else
        {
            Debug.LogError("文件已存在");
            if (fileType == ".bytes")
            {
                this.SendCommand(new LoadMapFileCommand(fileName) { });
            }
            
        }
    }

    /// <summary>
    /// 获取下载进度
    /// </summary>
    public float GetProcess(UnityWebRequest webRequestPoint)
    {
        if (webRequestPoint!=null)
        {
            return webRequestPoint.downloadProgress;
        }
        return 0;
    }
    /// <summary>
    /// 获取当前下载内容长度
    /// </summary>
    public long GetCurrentLength(UnityWebRequest webRequestPoint)
    {
        if (webRequestPoint != null)
        {
            return (long)webRequestPoint.downloadedBytes;
        }
        return 0;
    }
}