using Android.App;
using Android.Content;
using Android.Widget;
using System;

namespace XXCpzs.Droid
{
    public class FileDownload
    {
        #region --自动更新--
        
        /// <summary>
        /// 使用DownloadManager下载安装文件
        /// </summary>
        /// <param name="mContext"></param>
        /// <param name="apkAddress"></param>
        public static void DownloadUpdateFile(Context mContext, string apkAddress)
        {
            var apkFileName = System.IO.Path.GetFileName(apkAddress);
            DownloadManager.Request request = new DownloadManager.Request(Android.Net.Uri.Parse(apkAddress));
            // request.SetAllowedNetworkTypes(DownloadNetwork.Wifi);//网络环境
            //request.SetDestinationInExternalPublicDir("download", "update1.apk");
            request.SetDestinationInExternalFilesDir(mContext, Android.OS.Environment.DirectoryDownloads, apkFileName);
            request.SetNotificationVisibility(DownloadVisibility.VisibleNotifyCompleted);
            request.SetMimeType("application/vnd.android.package-archive");
            //设置通知信息
            request.SetTitle(apkFileName);
            request.SetDescription("软件更新");
            //设置为可见和可管理
            request.SetVisibleInDownloadsUi(true);
            //设置为可被媒体扫描器找到
            request.AllowScanningByMediaScanner();
            request.SetAllowedOverRoaming(false);

            //下载管理
            DownloadManager downManager = (DownloadManager)mContext.GetSystemService(Context.DownloadService);
            //获取此次下载的ID,返回一个唯一编号(用于识别通知来源)
            var refrence = downManager.Enqueue(request);

            // 注册广播监听系统的下载完成事件。
            IntentFilter intentFilter = new IntentFilter(DownloadManager.ActionDownloadComplete);
            var boradcastReceiver = new DownloadReceiver(refrence);
            mContext.RegisterReceiver(boradcastReceiver, intentFilter);

            /*备注:服务器端apk文件mime类型为application/vnd.android.package-archive
             * 需要权限:android.permission.INTERNET和android.permission.WRITE_EXTERNAL_STORAGE
             */
        }
         
        /// <summary>
        /// 自定义下载更新
        /// </summary>
        /// <param name="mContext"></param>
        /// <param name="apkAddress"></param>
        public void DownloadUpdateFile2(Context mContext, String apkAddress)
        {
            //权限检查
            if (mContext.CheckSelfPermission(Android.Manifest.Permission.WriteExternalStorage) != Android.Content.PM.Permission.Granted)
            {
                MainActivity.Instance.RequestPermissions(new string[] { Android.Manifest.Permission.WriteExternalStorage }, 1001);
                return;
            }

            Java.IO.FileOutputStream outputStream = null;
            System.IO.Stream inputStream = null;
            Java.Net.HttpURLConnection connection = null;
            Java.IO.File installFile = null;
            try
            {
                var url = new Java.Net.URL(apkAddress);
                connection = (Java.Net.HttpURLConnection)url.OpenConnection();
                connection.ConnectTimeout = 60 * 1000;//1分钟
                connection.ReadTimeout = 60 * 10 * 1000;
                connection.Connect();
                if (connection.ResponseCode != Java.Net.HttpStatus.Ok)
                {
                    var errorMessage = connection.ResponseCode.ToString() + " " + connection.ResponseMessage;
                    return;
                }
                var contentLength = connection.ContentLength;
                inputStream = connection.InputStream;
                var downloadFile = Android.Net.Uri.FromFile(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads));
                installFile = new Java.IO.File(downloadFile.Path, System.IO.Path.GetFileName(apkAddress));
                outputStream = new Java.IO.FileOutputStream(installFile, false);//需要获取存储权限
                byte[] data = new byte[4096];
                long total = 0;
                int count;
                while ((count = inputStream.Read(data, 0, data.Length)) > 0)
                {
                    total += count;
                    outputStream.Write(data, 0, count);
                }
            }
            catch (Exception ex)
            {
                Toast.MakeText(mContext, ex.Message, ToastLength.Long).Show();
            }

            if (outputStream != null)
                outputStream.Close();
            if (inputStream != null)
                inputStream.Close();
            if (connection != null)
                connection.Disconnect();

            if (installFile != null && installFile.Exists())
            {
                var installIntent = new Intent(Intent.ActionView);
                installIntent.SetDataAndType(Android.Net.Uri.FromFile(installFile), "application/vnd.android.package-archive");
                mContext.StartActivity(installIntent);
            }
        }
        #endregion
    }
}