using Gtk;

public class TextViewUrl : Gtk.TextView
{
  protected static string browser = "E:\\Firefox\\firefox.exe";
  protected Gtk.TextTag url_tag;

  construct
  {
    Gdk.Color blue;
    blue.red = 1300;
    blue.green = 1200;
    blue.blue = 60000;

    Gtk.TextTagTable tagTbl = this.buffer.get_tag_table ();

    this.url_tag = new Gtk.TextTag ("url_tag");
    this.url_tag.underline = Pango.Underline.SINGLE;
    this.url_tag.underline_set = true;
    this.url_tag.foreground_gdk = &blue;
    this.url_tag.event += TextViewUrl.event;
    tagTbl.add (this.url_tag);
  }

  [Callback]
  private static bool event (Gtk.TextTag sender, GLib.Object event_object,
                             Gdk.Event event, Gtk.TextIter iter)
  {
    bool ret = false;

    if (event.type == Gdk.EventType.BUTTON_RELEASE)
    {
      weak Gdk.EventButton event_btn = (Gdk.EventButton)event;

      if (event_btn.button == 1)
      {
        ret = TextViewUrl.url_activate (sender, iter);
      }
    }
    return ret;
  }

  private static bool url_activate (Gtk.TextTag sender, Gtk.TextIter iter)
  {
    bool ret = false;
    Gtk.TextIter start, end;
    string link;

    if (iter.toggles_tag (sender) == false)
    {
      // Go backward until this tag begins
      start = iter;
      while (start.begins_tag (sender) == false)
      {
        start.backward_char ();
      }

      // Go backward until this tag ends
      end = iter;
      while (end.ends_tag(sender) == false)
      {
        end.forward_char();
      }

      link = start.get_text (end);
      if (link != null)
      {
        try
        {
          string[] argv = new string[3];
          argv[0] = TextViewUrl.browser;
          argv[1] = link;
          argv[2] = null;
          GLib.Process.spawn_async (null, argv, null,
                                    GLib.SpawnFlags.SEARCH_PATH, null, null,
                                    null);
          ret = true;
        }
        catch (GLib.Error e)
        {
          GLib.critical (e.message);
        }
      }
    }
    return ret;
  }

  public void insert_url (Gtk.TextIter iter, string! url)
  {
    Gtk.TextIter start, end;
    Gtk.TextMark startOfURL;

    this.buffer.get_end_iter (out start);
    startOfURL = this.buffer.create_mark ("url_mark", start, true);

    this.buffer.insert (iter, url, -1);
    this.buffer.get_end_iter (out end);
    this.buffer.get_iter_at_mark (out start, startOfURL);
    this.buffer.apply_tag (this.url_tag, start, end);
    this.buffer.delete_mark (startOfURL);
  }
}