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namespace hyprwatch.Window
{
  using System;
  using System.Diagnostics;
  using System.Text.RegularExpressions;

  public partial class GetWindows
  {
    public static string ActiveWindow()
    {
      string desktopEnv = Environment.GetEnvironmentVariable("XDG_CURRENT_DESKTOP");
      string? activeWindow = null;

      try {
        Process process = new Process();
        process.StartInfo = new ProcessStartInfo();
        
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.CreateNoWindow = true;


        if(desktopEnv == "Hyprland")
        {
          process.StartInfo.FileName = "hyprctl";
          process.StartInfo.Arguments = "activewindow";
        } 
        else if(desktopEnv == "niri")
        {
          process.StartInfo.FileName = "niri";
          process.StartInfo.Arguments = "msg focused-window";
        }

        process.Start();

        string output = process.StandardOutput.ReadToEnd();
        process.WaitForExit();

        var classMatch = ClassRegex().Match(output);

        if(desktopEnv == "niri")
          {
            var match = Regex.Match(output, "App ID:\\s+\"([^\"]+)\"");
            if(match.Success)
            {
              activeWindow = match.Groups[1].Value.Trim();
            }
        }


        if(desktopEnv == "Hyprland")
        {
          if(classMatch.Success)
          {
            activeWindow = classMatch.Groups[1].Value.Trim();
          }
        }


      }
      catch(Exception ex)
      {
        Console.WriteLine(ex.Message);
      }

      if(activeWindow == null)
      {
        activeWindow = "Home-Screen";
      }

      return activeWindow ?? string.Empty;
    }

        [GeneratedRegex(@"class:(.+)")]
        private static partial Regex ClassRegex();
    }
}