using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;
using System.IO;
using MessageBox = System.Windows.MessageBox;
using System.Net;
using System.Globalization;
using ModernWpf.Controls;
using System.Windows.Forms;

namespace EZPPClient_Installer
{
  /// <summary>
  /// Interaction logic for MainWindow.xaml
  /// </summary>
  public partial class MainWindow : Window
  {

    [DllImport("kernel32.dll")]
    private static extern bool CreateSymbolicLink(string lpSymlinkFileName, string lpTargetFileName, SymbolicLink dwFlags);

    private static double VERSION = 1.6;

    public MainWindow()
    {
      InitializeComponent();
      DownloadUtil.FilesToDownload("yeet");
      Init();
    }

    private async void Init()
    {

      UpdateInstallButton(false);

      UpdateState status = await CheckForInstallerUpdates();

      switch (status)
      {
        case UpdateState.UpdateFound:
          ShowInstallerUpdateDialog();
          return;
        case UpdateState.Error:
          return;
      }


      string versionString = "v" + VERSION;
      InstallerWindow.Title = "EZPPClient Installer " + versionString.Replace(",", ".");

      string osuPath = "";
      bool isValidFolder = await isValidOsuFolder(osuPath);
      UpdateInstallButton(!string.IsNullOrEmpty(osuPath));
      
      if(!string.IsNullOrEmpty(osuPath) && isValidFolder)
      {
        bool foundInstall = await isEZPPClientInstallationFound(osuPath);
        if (foundInstall)
        {
          Uninstall_Button.Visibility = Visibility.Visible;
          UpdateInstallButton(false);



        }
        
        folderTextbox.Text = osuPath;
      }
      else
        await new ContentDialog()
        {
          Title = "Hmmm..",
          Content = "We failed to locate your osu! Installation path, please define it manually qwq",
          PrimaryButtonText = "Okay qwq"
        }.ShowAsync();

    }

    private async Task<UpdateState> CheckForInstallerUpdates()
    {
#if !DEBUG
      try
      {
        using (WebClient client = new WebClient())
        {
          string newVersionString = client.DownloadString("https://ez-pp.farm/static/client/installer.ver");
          double ver = 0;
          try
          {
            ver = double.Parse(newVersionString, CultureInfo.InvariantCulture);
          }
          catch (FormatException)
          {
          }

          if (ver > VERSION)
            return UpdateState.UpdateFound;
        }
      }
      catch (WebException e)
      {
        ShowErrorDialog(e.Message);
        return UpdateState.Error;
      }
#endif
      return UpdateState.UpToDate;
    }

    private async void ShowErrorDialog(string error)
    {
      var dialog = new ContentDialog()
      {
        Title = "Oops...",
        Content = "Failed to connect to the EZPPFarm Website.\n" + error,
        PrimaryButtonText = "Exit"
      };
      await dialog.ShowAsync();
      this.Close();
    }

    private async void ShowInstallerUpdateDialog()
    {
      UpdateInstallButton(false);
      var dialog = new ContentDialog()
      {
        Title = "New version available.",
        Content = "Please download the latest version.",
        PrimaryButtonText = "Download"
      };
      var result = await dialog.ShowAsync();

      if (result == ContentDialogResult.Primary)
      {
        System.Diagnostics.Process.Start("https://ez-pp.farm/download");
        ShowInstallerUpdateDialog();
      }
    }

    private void UpdateInstallButton(bool enable)
    {
      InstallButton.IsEnabled = enable;
      linkFoldersCheckbox.IsEnabled = enable;
    }

    private async void Install_Click(object sender, RoutedEventArgs e)
    {
      string osuFolder = folderTextbox.Text;
      bool isValid = await isValidOsuFolder(osuFolder);
      if (!isValid)
      {
        await new ContentDialog()
        {
          Title = "Hmmm..",
          Content = "It seems like the selected folder is not a osu! installation.",
          PrimaryButtonText = "Okay qwq"
        }.ShowAsync();
        return;
      }
      
      
    }

    private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
    {
      System.Diagnostics.Process.Start("https://ez-pp.farm/");
      e.Handled = true;
    }

    private async void Browse_Click(object sender, RoutedEventArgs e)
    {
      using (var fbd = new FolderBrowserDialog())
      {
        DialogResult result = fbd.ShowDialog();

        if (result == System.Windows.Forms.DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
        {
          bool isValid = await isValidOsuFolder(fbd.SelectedPath);

          if (!isValid)
          {
            await new ContentDialog()
            {
              Title = "Hmmm..",
              Content = "It seems like this location is not an osu! installation.",
              PrimaryButtonText = "Okay qwq"
            }.ShowAsync();
          }
          else
          {
            bool foundInstall = await isEZPPClientInstallationFound(fbd.SelectedPath);
            folderTextbox.Text = fbd.SelectedPath;

            if (foundInstall)
            {
              Uninstall_Button.Visibility = Visibility.Visible;
              UpdateInstallButton(false);

              string osuEZPPPath = folderTextbox.Text + @"\EZPPClient";
              List<string> outdatedFiles = DownloadUtil.FilesToDownload(osuEZPPPath);

              if (!IsEmpty(outdatedFiles))
              {
                InstallButton.Content = "Update";
                UpdateInstallButton(true);
              }

            }else
            UpdateInstallButton(true);
          }
        }
      }
    }

    private async Task<bool> isEZPPClientInstallationFound(string folder)
    {
      string[] subDirs = Directory.GetDirectories(folder, "*");
      bool doesExist = false;
      
      foreach (string dir in subDirs)
      {
        if(dir.Contains("EZPPClient"))
        {
          doesExist = true;
          break;
        }
      }

      return doesExist;
    }

    private async Task<bool> isValidOsuFolder(string folder)
    {
      if(string.IsNullOrEmpty(folder) || string.IsNullOrWhiteSpace(folder))
        return false;
      string[] files = Directory.GetFiles(folder, "*");
      string[] subDirs = Directory.GetDirectories(folder, "*");
      bool hasSongsFolder = false;
      bool hasSkinsFolder = false;
      bool hasOsuExecutable = false;
      foreach(string file in files)
      {
        if (file.Contains("osu!.exe"))
        {
          hasOsuExecutable = true;
          break;
        }
      }

      foreach (string dir in subDirs)
      {
        if (dir.Contains("Songs") && !hasSongsFolder)
          hasSongsFolder = true;
        if (dir.Contains("Skins") && !hasSkinsFolder)
          hasSkinsFolder = true;

        if (hasSkinsFolder && hasSongsFolder)
          break;
      }

      return hasOsuExecutable && hasSkinsFolder && hasSongsFolder;
    }

    public static bool IsEmpty<T>(List<T> list)
    {
      if (list == null)
      {
        return true;
      }

      return !list.Any();
    }

    private enum SymbolicLink
    {
      File,
      Directory
    }

  }
}