using ICSharpCode.SharpZipLib.Zip;
using System;
using System.IO;
using System.Net;
using System.Windows.Forms;

namespace UAS_AutoUpdate
{
    public partial class CheckUpdateWindow : Form
    {

        public static bool Zipped = false;

        public CheckUpdateWindow()
        {
            InitializeComponent();
            StartPosition = FormStartPosition.CenterScreen;
        }

        private void CheckUpdateWindow_Load(object sender, EventArgs e)
        {

            //使用WebClient从指定位置下载文件，然后进行解压缩覆盖
            WebClient wc = new WebClient();
            wc.DownloadProgressChanged += Wc_DownloadProgressChanged;
            wc.DownloadFileAsync(new Uri("http://172.16.11.99/UAS_MES.zip"), "UAS_MES.zip");
        }

        private void Wc_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            Action act = () =>
            {
                _progressbar.Value = e.ProgressPercentage;
                _processrate.Text = e.ProgressPercentage + "%";
            };
            if (IsHandleCreated)
                this.Invoke(act);
            if (e.ProgressPercentage == 100)
            {
                if (!Zipped)
                {
                    ZipHelper.UnZip(Application.StartupPath + @"\UAS_MES.zip", Application.StartupPath);
                }
                else
                {
                    Close();
                }
            }
        }
    }

    public class ZipHelper
    {
        /// <summary>
        /// 用于解压缩Zip文件
        /// </summary>
        /// <param name="ZipFilePath"></param>
        /// <param name="UnZipPath"></param>
        public static void UnZip(string ZipFilePath, string UnZipPath)
        {
            if (!File.Exists(ZipFilePath))
            {
                throw new FileNotFoundException(string.Format("未能找到文件 '{0}' ", ZipFilePath));
            }

            if (!Directory.Exists(UnZipPath))
            {
                Directory.CreateDirectory(UnZipPath);
            }

            using (var s = new ZipInputStream(File.OpenRead(ZipFilePath)))
            {
                ZipEntry theEntry;
                while ((theEntry = s.GetNextEntry()) != null)
                {
                    if (theEntry.IsDirectory)
                    {
                        continue;
                    }
                    string directorName = Path.Combine(UnZipPath, Path.GetDirectoryName(theEntry.Name));
                    string fileName = Path.Combine(directorName, Path.GetFileName(theEntry.Name));
                    if (!Directory.Exists(directorName))
                    {
                        Directory.CreateDirectory(directorName);
                    }
                    if (!string.IsNullOrEmpty(fileName))
                    {
                        try
                        {
                            //防止文件正在使用中报错
                            using (FileStream streamWriter = File.Create(fileName))
                            {
                                int size = 4096;
                                byte[] data = new byte[size];
                                while (size > 0)
                                {
                                    size = s.Read(data, 0, data.Length);
                                    streamWriter.Write(data, 0, size);
                                }
                            }
                        }
                        catch (Exception)
                        {
                        }
                    }
                }
                File.Delete(Application.StartupPath + @"\UAS_MES.zip");
                CheckUpdateWindow.Zipped = true;
            }
        }
    }
}