/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
 * Copyright © 2012 – 2017 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include "goaidentityutils.h"

#include <string.h>

#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <gio/gio.h>

void
goa_identity_utils_split_identifier (const char  *identifier,
                                     char       **user,
                                     char       **domain)
{
  char **components;

  if (user != NULL)
    *user = NULL;

  if (domain != NULL)
    *domain = NULL;

  components = g_strsplit (identifier, "@", -1);

  if (components[0] != NULL)
    {
      if (user != NULL)
        *user = g_strdup (components[0]);

      if (components[1] != NULL && domain != NULL)
        *domain = g_strdup (components[1]);
    }

  g_strfreev (components);
}

char *
goa_identity_utils_escape_object_path (const char *data,
                                       gsize       length)
{
  const char *p;
  char *object_path;
  GString *string;

  g_return_val_if_fail (data != NULL, NULL);

  string = g_string_sized_new ((length + 1) * 6);

  for (p = data; *p != '\0'; p++)
    {
      guchar character;

      character = (guchar) * p;

      if (((character >= ((guchar) 'a')) &&
           (character <= ((guchar) 'z'))) ||
          ((character >= ((guchar) 'A')) &&
           (character <= ((guchar) 'Z'))) ||
          ((character >= ((guchar) '0')) && (character <= ((guchar) '9'))))
        {
          g_string_append_c (string, (char) character);
          continue;
        }

      g_string_append_printf (string, "_%x_", character);
    }

  object_path = string->str;

  g_string_free (string, FALSE);

  return object_path;
}

static char *
dashed_string_to_studly_caps (const char *dashed_string)
{
  char *studly_string;
  size_t studly_string_length;
  size_t i;

  i = 0;

  studly_string = g_strdup (dashed_string);
  studly_string_length = strlen (studly_string);

  studly_string[i] = g_ascii_toupper (studly_string[i]);
  i++;

  while (i < studly_string_length)
    {
      if (studly_string[i] == '-' || studly_string[i] == '_')
        {
          g_memmove (studly_string + i,
                     studly_string + i + 1,
                     studly_string_length - i - 1);
          studly_string_length--;
          if (g_ascii_isalpha (studly_string[i]))
            studly_string[i] = g_ascii_toupper (studly_string[i]);
        }
      i++;
    }
  studly_string[studly_string_length] = '\0';

  return studly_string;
}

static char *
dashed_string_to_dbus_error_string (const char *dashed_string,
                                    const char *old_prefix,
                                    const char *new_prefix,
                                    const char *suffix)
{
  char *studly_suffix;
  char *dbus_error_string;
  size_t dbus_error_string_length;
  size_t i;

  i = 0;

  if (g_str_has_prefix (dashed_string, old_prefix) &&
      (dashed_string[strlen (old_prefix)] == '-' ||
       dashed_string[strlen (old_prefix)] == '_'))
    dashed_string += strlen (old_prefix) + 1;

  studly_suffix = dashed_string_to_studly_caps (suffix);
  dbus_error_string =
    g_strdup_printf ("%s.%s.%s", new_prefix, dashed_string, studly_suffix);
  g_free (studly_suffix);
  i += strlen (new_prefix) + 1;

  dbus_error_string_length = strlen (dbus_error_string);

  dbus_error_string[i] = g_ascii_toupper (dbus_error_string[i]);
  i++;

  while (i < dbus_error_string_length)
    {
      if (dbus_error_string[i] == '_' || dbus_error_string[i] == '-')
        {
          dbus_error_string[i] = '.';

          if (g_ascii_isalpha (dbus_error_string[i + 1]))
            dbus_error_string[i + 1] = g_ascii_toupper (dbus_error_string[i + 1]);
        }

      i++;
    }

  return dbus_error_string;
}

void
goa_identity_utils_register_error_domain (GQuark error_domain,
                                          GType  error_enum)
{
  const char *error_domain_string;
  char *type_name = NULL;
  GType type;
  GTypeClass *type_class = NULL;
  const GEnumClass *enum_class;
  guint i;

  error_domain_string = g_quark_to_string (error_domain);
  type_name = dashed_string_to_studly_caps (error_domain_string);
  type = g_type_from_name (type_name);
  type_class = g_type_class_ref (type);

  if (type_class == NULL)
    {
      g_warning ("GoaIdentityUtils: Could not identity type %s", type_name);
      goto out;
    }

  enum_class = G_ENUM_CLASS (type_class);

  for (i = 0; i < enum_class->n_values; i++)
    {
      char *dbus_error_string;

      dbus_error_string = dashed_string_to_dbus_error_string (error_domain_string,
                                                              "goa",
                                                              "org.gnome",
                                                              enum_class->values[i].
                                                              value_nick);

      g_debug ("GoaIdentityUtils: Registering dbus error %s", dbus_error_string);
      g_dbus_error_register_error (error_domain,
                                   enum_class->values[i].value, dbus_error_string);
      g_free (dbus_error_string);
    }

 out:
  g_clear_pointer (&type_class, g_type_class_unref);
  g_free (type_name);
}