/*
     This file is part of GNUnet.
     (C) 2012 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file src/gns/gnunet-gns-gtk.c
 * @brief Main function of gnunet-gns-gtk
 * @author Christian Grothoff
 */
#include "gnunet_gtk.h"
#include <gnunet/gnunet_namestore_service.h>

/**
 * Handle to our main loop.
 */
static struct GNUNET_GTK_MainLoop *ml;

/**
 * Should gnunet-gns-gtk start in tray mode?
 */
static int tray_only;

/**
 * Hash of the public key of our zone.
 */
static GNUNET_HashCode zone;

/**
 * Private key for the our zone.
 */
static struct GNUNET_CRYPTO_RsaPrivateKey *zone_pkey;

/**
 * Handle to the namestore.
 */
static struct GNUNET_NAMESTORE_Handle *ns;

/**
 * Name of our zone as a string.
 */
static char *zone_as_string;

/**
 * Default directory of zone files as a string.
 */
static char *zonefile_directory;

static GtkWidget *main_window;

/**
 * Get cfg.
 */
static const struct GNUNET_CONFIGURATION_Handle *
get_configuration ()
{
  return GNUNET_GTK_main_loop_get_configuration (ml);
}


/**
 * Get an object from the main window.
 *
 * @param name name of the object
 * @return NULL on error
 */
static GObject *
get_object (const char *name)
{
  return GNUNET_GTK_main_loop_get_object (ml, name);
}


/**
 * The user edited the preferred name (PSEU) of this namespace.
 * Push the update to the namestore.
 *
 * @param editable the edited widget
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_pseu_entry_changed_cb (GtkEditable *editable,
				      gpointer user_data)
{
  GNUNET_break (0); // FIXME, not implemented
}


/**
 * The user toggled the 'autoshort' option.  Update the configuration.
 *
 * @param checkmenuitem the menu item
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_autoshort_imagemenuitem_toggled_cb (GtkCheckMenuItem *checkmenuitem,
						   gpointer user_data)
{
  GNUNET_break (0); // FIXME, not implemented
}


/**
 * The user selected 'NEW' in the menu.  Open a dialog to enter a filename
 * to create a new zone (for editing).
 *
 * @param checkmenuitem the menu item
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_new_imagemenuitem_activate_cb (GtkMenuItem *menuitem,
					      gpointer user_data)
{
  GNUNET_break (0); // FIXME, not implemented
}


/**
 * Function called from the open-directory dialog upon completion.
 *
 * @param dialog the pseudonym selection dialog
 * @param response_id response code from the dialog
 * @param user_data the builder of the dialog
 */
void
GNUNET_GNS_GTK_zone_open_dialog_response_cb (GtkDialog * dialog,
					     gint response_id,
					     gpointer user_data)
{
  GtkBuilder *builder = user_data;
  char *filename;

  if (GTK_RESPONSE_OK != response_id)
  {
    gtk_widget_destroy (GTK_WIDGET (dialog));
    g_object_unref (G_OBJECT (builder));
    return;
  }
  filename = GNUNET_GTK_filechooser_get_filename_utf8 (GTK_FILE_CHOOSER (dialog));
  gtk_widget_destroy (GTK_WIDGET (dialog));
  g_object_unref (G_OBJECT (builder));

  /* FIXME: move to new zone 'filename' */
  fprintf (stderr, "Got zone `%s'\n", filename);
  GNUNET_free (filename);  
}


/**
 * The user selected 'OPEN' in the menu.  Open a dialog to select
 * a different zonefile (for editing).
 *
 * @param checkmenuitem the menu item
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_open_imagemenuitem_activate_cb (GtkMenuItem *menuitem,
					       gpointer user_data)
{
  GtkWidget *ad;
  GtkBuilder *builder;
  GtkWidget *toplevel;

  builder =
    GNUNET_GTK_get_new_builder ("gnunet_gns_gtk_zone_open.glade", NULL);
  if (NULL == builder)
  {
    GNUNET_break (0);
    return;
  }
  ad = GTK_WIDGET (gtk_builder_get_object
                   (builder, "GNUNET_GNS_GTK_zone_open_filechooserdialog"));
  toplevel = gtk_widget_get_toplevel (menuitem);
  if (GTK_IS_WINDOW (toplevel))
    gtk_window_set_transient_for (GTK_WINDOW (ad), GTK_WINDOW (toplevel));
  gtk_window_present (GTK_WINDOW (ad));
}


/**
 * The user clicked on the 'copy' button.  Copy the full string
 * with the hash of our public key to the clipboard.
 *
 * @param button the button that was clicked
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_public_key_copy_button_clicked_cb (GtkButton *button,
						  gpointer user_data)
{
  GtkClipboard *cb;

  cb = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
  gtk_clipboard_set_text (cb, zone_as_string, -1);
}


/**
 * Task run on shutdown.
 *
 * @param cls unused
 * @param tc scheduler context, unused
 */
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  if (NULL != ns)
  {
    GNUNET_NAMESTORE_disconnect (ns, GNUNET_NO);
    ns = NULL;
  }
  if (NULL != zone_pkey)
  {
    GNUNET_CRYPTO_rsa_key_free (zone_pkey);
    zone_pkey = NULL;
  }
  if (NULL != zonefile_directory)
  {
    GNUNET_free (zonefile_directory);
    zonefile_directory = NULL;
  }
}


/**
 * Callback invoked if the application is supposed to exit (via menu).
 *
 * @param menuitem the quit menu
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_quit_imagemenuitem_activate_cb (GtkMenuItem *menuitem,
					       gpointer user_data)
{
  GNUNET_GTK_tray_icon_destroy ();
  GNUNET_GTK_main_loop_quit (ml);
  GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
}


/**
 * Callback invoked if the application is supposed to exit (via window-close).
 *
 * @param widget the main window
 * @param event deletion event
 * @param user_data unused
 */
void
GNUNET_GNS_GTK_main_window_delete_event_cb (GtkWidget *widget,
					    GdkEvent *event,
					    gpointer user_data)
{
  GNUNET_GTK_tray_icon_destroy ();
  GNUNET_GTK_main_loop_quit (ml);
  GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
}


/**
 * Actual main function run right after GNUnet's scheduler
 * is initialized.  Initializes up GTK and Glade.
 *
 * @param cls the 'struct GNUNET_GTK_MainLoop'
 * @param tc scheduler context
 */
static void
run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pub;

  char *keyfile;
  char *label;

  ml = cls;
  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (get_configuration (),
                                                            "namestore",
                                                            "ZONEFILE_DIRECTORY",
                                                            &zonefile_directory))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _("Option `%s' missing in section `%s'\n"),
                "ZONEFILE_DIRECTORY", "namestore");
    return;
  }

  if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (get_configuration (),
							    "gns",
							    "ZONEKEY",
							    &keyfile))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		_("Option `%s' missing in section `%s'\n"),
		"ZONEKEY", "gns");
    return;
  }
  zone_pkey = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
  GNUNET_free (keyfile);
  keyfile = NULL;
  if (NULL == zone_pkey)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		_("Failed to read or create private zone key\n"));
    return;
  }
  GNUNET_CRYPTO_rsa_key_get_public (zone_pkey,
				    &pub);
  GNUNET_CRYPTO_hash (&pub, sizeof (pub), &zone);

  ns = GNUNET_NAMESTORE_connect (get_configuration ());
  if (NULL == ns)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		_("Failed to connect to namestore\n"));
    GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
    return;
  }
  if (GNUNET_OK != GNUNET_GTK_main_loop_build_window (ml, NULL))
  {
    GNUNET_break (0);
    GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
    return;
  }
  zone_as_string = GNUNET_strdup (GNUNET_h2s_full (&zone));
  label = g_markup_printf_escaped (_("<b>Editing zone %s</b>"),
				   zone_as_string);
  gtk_label_set_markup (GTK_LABEL (get_object ("GNUNET_GNS_GTK_zone_label")),
			label);
  g_free (label);

  GNUNET_GTK_set_icon_search_path ();
  GNUNET_GTK_setup_nls ();
  /* setup main window */
  main_window = GTK_WIDGET (get_object ("GNUNET_GNS_GTK_main_window"));
  //gtk_window_maximize (GTK_WINDOW (main_window));
  GNUNET_GTK_tray_icon_create (GTK_WINDOW (main_window),
                               "gnunet-gtk" /* FIXME: different icon? */ ,
                               "gnunet-gns-gtk");

  /* make GUI visible */
  if (!tray_only)
  {
    gtk_widget_show (main_window);
    gtk_window_present (GTK_WINDOW (main_window));
  }
}


int
main (int argc, char *const *argv)
{
  static struct GNUNET_GETOPT_CommandLineOption options[] = {
    {'t', "tray", NULL,
     gettext_noop ("start in tray mode"), 0,
     &GNUNET_GETOPT_set_one, &tray_only},
    GNUNET_GETOPT_OPTION_END
  };

  if (GNUNET_OK !=
      GNUNET_GTK_main_loop_start ("gnunet-gns-gtk",
                                  "GTK GUI for editing our zone", argc,
                                  argv, options,
                                  "gnunet_gns_gtk_main_window.glade",
                                  &run))
    return 1;
  return 0;
}


/* end of gnunet-gns-gtk.c */