using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using UpdateLib.Data;

namespace UpdateLib.UI
{
    public partial class frmUpdater : Form
    {
        int index = 0;
        private UpdateSaveFile localInfoFile;
        private String baseUrl;

        public frmUpdater(UpdateSaveFile file, String baseUrl)
        {
            InitializeComponent();

            localInfoFile = file;
            pbInstall.Maximum = (file.UpdateFileCollection.Count) * 100;
            this.baseUrl = baseUrl;

            foreach (UpdateFileInfo fileInfo in file.UpdateFileCollection)
            {
                ListViewItem lvItem = new ListViewItem(new String[] { fileInfo.Name, "Waiting...", fileInfo.Description });
                lvItems.Items.Add(lvItem);
            }
        }

        private void btnInstall_Click(object sender, EventArgs e)
        {
            if (btnInstall.Text.Equals("Finish"))
            {
                MessageBox.Show("Update erfolgreich. Programm wird beendet");
                Application.Exit();
            }
            else
            {
                btnInstall.Enabled = false;
                DownloadFile();
            }
        }

        private void DownloadFile()
        {
            WebClient downloadClient = new WebClient();

            downloadClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(downloadClient_DownloadProgressChanged);
            downloadClient.DownloadFileCompleted += new AsyncCompletedEventHandler(downloadClient_DownloadFileCompleted);

            ListViewItem currItem = lvItems.Items[index];
            String name = currItem.SubItems[0].Text;

            SetStatus(String.Format("Downloading {0} ...", name));
            currItem.SubItems[1].Text = "Downloading...";

            String local = String.Format(@".\{0}", name);
            String online = String.Format("{0}{1}", baseUrl, name);

            if (File.Exists(local))
            {
                if (File.Exists(local + ".old"))
                    File.Delete(local + ".old");
                File.Move(local, local + ".old");
            }
            downloadClient.DownloadFileAsync(new Uri(online), local);
        }

        private void SetStatus(string p)
        {
            lblStatus.Text = String.Format("Status: {0}", p);
        }

        private void downloadClient_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            ListViewItem currItem = lvItems.Items[index];
            currItem.SubItems[1].Text = "Downloaded";

            pbInstall.Increment(100);
            pbDownload.Value = 0;
            index++;

            if (lvItems.Items.Count - 1 >= index)
                DownloadFile();
            else
            {
                SetStatus("Finished!");
                btnInstall.Text = "Finish";
                btnInstall.Enabled = true;

            }
        }

        private void downloadClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            pbDownload.Value = e.ProgressPercentage;
        }
    }
}