/*
     This file is part of anastasis-gtk.
     Copyright (C) 2021 Anastasis SARL

     Anastasis 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 3, or (at your
     option) any later version.

     Anastasis 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 Anastasis; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/

/**
 * @file src/anastasis/anastasis-gtk_print.c
 * @brief Implementation of the "Save as" button for the user attributes
 * @author Christian Grothoff
 */
#include <gnunet/platform.h>
#include <gnunet/gnunet_util_lib.h>
#include "anastasis-gtk_attributes.h"
#include "anastasis-gtk_helper.h"
#include <jansson.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "print.h"


/**
 * Generate PDF of the user's personal attributes
 * and output it to @a filename.
 *
 * @param parent_window the parent window of the button
 * @param filename where to store the result
 */
static void
print_to_file (GtkWindow *parent_window,
               const char *filename)
{
  json_t *attr;
  json_t *attrs;
  json_t *uattrs;
  int ret;
  json_t *av;
  json_t *ra;
  const char *key;

  ra = json_object_get (AG_redux_state,
                        "required_attributes");
  attr = AG_collect_attributes (false);
  attrs = json_object_get (attr,
                           "identity_attributes");
  /*
     Example for ATTRS is now:
     "full_name": "Max",
     "birthdate": "1980-09-22",
     "sq_number": "4"
  */
  /* Convert JSON key 'full_name' to (possibly translated) version
     of "Full name" using the "required_attributes" data structure
     in 'ra' */
  uattrs = json_object ();
  json_object_foreach (attrs, key, av)
  {
    json_t *pos;
    size_t off;
    bool found = false;

    json_array_foreach (ra, off, pos)
    {
      const char *name = json_string_value (json_object_get (pos,
                                                             "name"));

      if (NULL == name)
      {
        GNUNET_break (0);
        continue;
      }
      if (0 == strcmp (name,
                       key))
      {
        const char *tkey;
        struct GNUNET_JSON_Specification spec[] = {
          GNUNET_JSON_spec_string ("label",
                                   &tkey),
          GNUNET_JSON_spec_end ()
        };

        if (GNUNET_OK !=
            GNUNET_JSON_parse (pos,
                               spec,
                               NULL, NULL))
        {
          GNUNET_break (0);
          continue;
        }
        found = true;
        GNUNET_break (0 ==
                      json_object_set (uattrs,
                                       dgettext ("anastasis",
                                                 tkey),
                                       av));
      }
    }
    if (! found)
    {
      GNUNET_break (0);
      GNUNET_break (0 ==
                    json_object_set (uattrs,
                                     key,
                                     av));
    }
  }
  json_decref (attrs);

  /* now convert to PDF */
  ret = AG_print (uattrs,
                  filename);
  json_decref (uattrs);
  if (0 != ret)
  {
    /* report something went wrong; alas, we don't have a good
       error message here (yet)...*/
    GtkDialogFlags flags = GTK_DIALOG_DESTROY_WITH_PARENT;
    GtkWidget *dialog;

    dialog = gtk_message_dialog_new (parent_window,
                                     flags,
                                     GTK_MESSAGE_ERROR,
                                     GTK_BUTTONS_CLOSE,
                                     _ ("Failed to generate PDF file."));
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
  }
}


/**
 * The user clicked the 'save as' button to save their personal
 * details. Try to save them as a PDF.
 *
 * @param button the button that triggered printing
 * @param user_data the builder for the dialog
 */
void
anastasis_gtk_print_details_button_clicked_cb (GtkWidget *button,
                                               gpointer user_data)
{
  GtkWidget *dialog;
  GtkFileChooser *chooser;
  GtkFileChooserAction action = GTK_FILE_CHOOSER_ACTION_SAVE;
  gint res;
  GtkWindow *parent_window;
  GtkWidget *top;

  (void) user_data;
  top = gtk_widget_get_toplevel (button);
  if (GTK_IS_WINDOW (top))
  {
    parent_window = GTK_WINDOW (top);
  }
  else
  {
    GNUNET_break (0);
    parent_window = NULL;
  }
  dialog = gtk_file_chooser_dialog_new ("Save Personal Details to PDF file",
                                        parent_window,
                                        action,
                                        _ ("_Cancel"),
                                        GTK_RESPONSE_CANCEL,
                                        _ ("_Save"),
                                        GTK_RESPONSE_ACCEPT,
                                        NULL);
  chooser = GTK_FILE_CHOOSER (dialog);
  gtk_file_chooser_set_do_overwrite_confirmation (chooser,
                                                  TRUE);
  gtk_file_chooser_set_current_name (chooser,
                                     _ ("anastasis-personal-details.pdf"));
  res = gtk_dialog_run (GTK_DIALOG (dialog));
  gtk_widget_hide (GTK_WIDGET (dialog));
  if (res == GTK_RESPONSE_ACCEPT)
  {
    char *filename;

    filename = gtk_file_chooser_get_filename (chooser);
    print_to_file (parent_window,
                   filename);
    g_free (filename);
  }
  gtk_widget_destroy (dialog);
}