using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Schema;
using System.IO.Compression;
using System.IO;
using System.Linq.Expressions;

namespace OnDocUpdate
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        public void Update() { 
            try
            {
                Application.DoEvents();
                string filename = Params.UpdatePath + @"\version.txt";
                string version = "";
                if (System.IO.File.Exists(filename))
                {
                    version = System.IO.File.ReadAllText(filename);
                    if (version != Params.Version)
                    {
                        MessageBox.Show("Die angeforderte Update-Version " + Params.Version + " ist nicht verfügbar", "OnDoc-Update", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        return;
                    }

                }
                string sourcefilename = Params.UpdatePath + @"\" + Params.Version.Replace(".", "_") + "_OnDocUpdate.zip";
                string destfilename = Params.DestPath + @"\" + Params.Version.Replace(".", "_") + "_OnDocUpdate.zip";
                if (!System.IO.File.Exists(sourcefilename))
                {
                    MessageBox.Show("Die angeforderte Update-Datei " + sourcefilename + " ist nicht vorhanden", "OnDoc-Update", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    this.Close();
                    return;
                }
                if (!System.IO.Directory.Exists(Params.DestPath))
                {
                    MessageBox.Show("Die angegebene Zielverzeichnis " + Params.DestPath + " ist nicht vorhanden", "OnDoc-Update", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                System.IO.File.Copy(sourcefilename, destfilename, true);
                if (ExtractAndOverwrite(destfilename, Params.DestPath))
                {
                    if (Params.StartApp != "")
                    {
                        Process.Start(Params.StartApp);
                    }
                }
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }
        private bool ExtractAndOverwrite(string zipfile, string destpath)
        {
            try
            {
                string zipPath = zipfile;
                string tempPath = Path.Combine(destpath, "tempUnzip");
                string extractPath = destpath;
                if (!System.IO.Directory.Exists(tempPath)) 
                { 
                    System.IO.Directory.CreateDirectory(tempPath);
                }
                ZipFile.ExtractToDirectory(zipPath, tempPath);

                //build an array of the unzipped files
                string[] files = Directory.GetFiles(tempPath);

                foreach (string file in files)
                {
                    FileInfo f = new FileInfo(file);
                    //Check if the file exists already, if so delete it and then move the new file to the extract folder
                    if (File.Exists(Path.Combine(extractPath, f.Name)))
                    {
                        File.Delete(Path.Combine(extractPath, f.Name));
                        File.Move(f.FullName, Path.Combine(extractPath, f.Name));
                    }
                    else
                    {
                        File.Move(f.FullName, Path.Combine(extractPath, f.Name));
                    }
                }
                //Delete the temporary directory.
                Directory.Delete(tempPath);
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            Update();
            this.Close();
        }
    }
}