/*
 * panel-gsettings.c: various small extensions to gsettings
 *
 * Copyright (C) 2011 Novell, Inc.
 *
 * This program 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 of the
 * License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Authors:
 *	Vincent Untz <vuntz@gnome.org>
 */

#include <gio/gio.h>

#include "panel-gsettings.h"

/* Adapted from is_valid_keyname() in glib (gio/glib-compile-schemas.c)
 * Differences:
 *  - gettext support removed (we don't need translations here)
 *  - remove support for allow_any_name
 */
gboolean
panel_gsettings_is_valid_keyname (const gchar  *key,
                                  GError      **error)
{
  gint i;

  if (key[0] == '\0')
    {
      g_set_error_literal (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                           "empty names are not permitted");
      return FALSE;
    }

  if (!g_ascii_islower (key[0]))
    {
      g_set_error (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                   "invalid name '%s': names must begin "
                     "with a lowercase letter", key);
      return FALSE;
    }

  for (i = 1; key[i]; i++)
    {
      if (key[i] != '-' &&
          !g_ascii_islower (key[i]) &&
          !g_ascii_isdigit (key[i]))
        {
          g_set_error (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                       "invalid name '%s': invalid character '%c'; "
                         "only lowercase letters, numbers and dash ('-') "
                         "are permitted.", key, key[i]);
          return FALSE;
        }

      if (key[i] == '-' && key[i + 1] == '-')
        {
          g_set_error (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                       "invalid name '%s': two successive dashes ('--') "
                         "are not permitted.", key);
          return FALSE;
        }
    }

  if (key[i - 1] == '-')
    {
      g_set_error (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                   "invalid name '%s': the last character may not be a "
                     "dash ('-').", key);
      return FALSE;
    }

  if (i > 32)
    {
      g_set_error (error, G_MARKUP_ERROR, G_MARKUP_ERROR_INVALID_CONTENT,
                   "invalid name '%s': maximum length is 32", key);
      return FALSE;
    }

  return TRUE;
}

gboolean
panel_gsettings_append_strv (GSettings   *settings,
                             const gchar *key,
                             const gchar *value)
{
        gchar    **old;
        gchar    **new;
        gint       size;
        gboolean   retval;

        old = g_settings_get_strv (settings, key);

        for (size = 0; old[size] != NULL; size++);

        size += 1; /* appended value */
        size += 1; /* NULL */

        new = g_realloc_n (old, size, sizeof (gchar *));

        new[size - 2] = g_strdup (value);
        new[size - 1] = NULL;

        retval = g_settings_set_strv (settings, key,
                                      (const gchar **) new);

        g_strfreev (new);

        return retval;
}

gboolean
panel_gsettings_remove_all_from_strv (GSettings   *settings,
                                      const gchar *key,
                                      const gchar *value)
{
        GArray    *array;
        gchar    **old;
        gint       i;
        gboolean   retval;

        old = g_settings_get_strv (settings, key);
        array = g_array_new (TRUE, TRUE, sizeof (gchar *));

        for (i = 0; old[i] != NULL; i++) {
                if (g_strcmp0 (old[i], value) != 0)
                        array = g_array_append_val (array, old[i]);
        }

        retval = g_settings_set_strv (settings, key,
                                      (const gchar **) array->data);

        g_strfreev (old);
        g_array_free (array, TRUE);

        return retval;
}
