using System;
using Gtk;
using Glade;

class SimpleViewer2
{
  [Widget] Window Window1;
  [Widget] AboutDialog aboutdialog1;
  [Widget] TextView textview1;
  [Widget] CheckMenuItem menuWordWrap;

  public static void Main(string[] args)
  {
    new SimpleViewer2(args);
  }

  public SimpleViewer2(string[] args)
  {
    try
    {
      Application.Init();
      Glade.XML guiXml = new Glade.XML("SimpleViewer2.glade", "Window1", null);
      guiXml.Autoconnect(this);
      if( args.Length > 0 )
      {
        loadFile(args[0]);
      }
      Application.Run();
    }
    catch( Exception e )
    {
      Console.WriteLine("Error running application:\n\n" + e);
    }
  }

  public void OnWindow1DeleteEvent(object o, DeleteEventArgs args)
  {
    Console.WriteLine("OnWindow1DeleteEvent start");
    args.RetVal = doCloseApplication();
    Console.WriteLine("OnWindow1DeleteEvent done: {0}", args.RetVal);
  }

  private bool doCloseApplication()
  {
    Console.WriteLine("Application Quitting");
    // TODO: Any checks to determine whether or not the application
    // should stay active..
    //if( test-for-shutdown fails )
    //  return false;

    // By default, quit application and signal that we should
    // close the main window.
    Application.Quit();
    return true;
  }

  public void OnFileOpenEvent(object o, EventArgs args)
  {
    Console.WriteLine("OnFileOpenEvent start");

    FileChooserDialog fc = new FileChooserDialog("Select file to open",
        Window1,
        FileChooserAction.Open,
        "Cancel",ResponseType.Cancel,
        "Open",ResponseType.Accept);

    int resp = fc.Run();
    fc.Hide();
    if( resp == (int)ResponseType.Accept )
    {
      loadFile(fc.Filename);
    }
    fc.Destroy();
    Console.WriteLine("OnFileOpenEvent done");
  }

  private bool loadFile( string filename )
  {
    int err = 0;
    try
    {
      System.IO.StreamReader sr = new System.IO.StreamReader(filename);
      textview1.Buffer.Text = sr.ReadToEnd();
      sr.Close();
    }
    catch( UnauthorizedAccessException )
    {
      showError("You are not authorized to access this file.");
      err++;
    }
    catch( Exception e )
    {
      showError("Unexpected error while loading the file, please contact the author with the following information:\n\n" + e);
      err++;
    }
    return err == 0;
  }

  private void showError( string s )
  {
      MessageDialog md = new MessageDialog(Window1,
          DialogFlags.DestroyWithParent,
          MessageType.Error,
          ButtonsType.Close,
          s);
      md.Run();
      md.Destroy();
  }

  public void OnQuitEvent(object o, EventArgs args)
  {
    Console.WriteLine("OnQuitEvent start");
    doCloseApplication();
    Console.WriteLine("OnQuitEvent done");
  }

  public void OnWordWrapActivatedEvent(object o, EventArgs args)
  {
    textview1.WrapMode = menuWordWrap.Active ? WrapMode.WordChar : WrapMode.None;
  }

  public void OnMenuHelpAboutActivatedEvent(object o, EventArgs args)
  {
    try
    {
      Console.WriteLine("OnMenuHelpAboutActivatedEvent start");
      XML aboutXml = new XML("SimpleViewer2.glade", "aboutdialog1", null);
      aboutXml.Autoconnect(this);
      if( aboutdialog1 == null )
        Console.WriteLine("aboutdialog1 is null (?)");
      else
      {
        aboutdialog1.TransientFor = Window1;
        aboutdialog1.Run();
        aboutdialog1.Destroy();
      }
      Console.WriteLine("OnMenuHelpAboutActivatedEvent done");
    }
    catch( Exception e )
    {
      Console.WriteLine("Could not display the About dialog: {0}", e);
    }
  }
}