/* GDBus - GLib D-Bus Library
 *
 * Copyright (C) 2008-2010 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 2.1 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/>.
 *
 * Author: David Zeuthen <davidz@redhat.com>
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <locale.h>

#include <gio/gio.h>

#include <gi18n.h>

#ifdef G_OS_WIN32
#include "glib/glib-private.h"
#endif

/* ---------------------------------------------------------------------------------------------------- */

G_GNUC_UNUSED static void completion_debug (const gchar *format, ...);

/* Uncomment to get debug traces in /tmp/gdbus-completion-debug.txt (nice
 * to not have it interfere with stdout/stderr)
 */
#if 0
G_GNUC_UNUSED static void
completion_debug (const gchar *format, ...)
{
  va_list var_args;
  gchar *s;
  static FILE *f = NULL;

  va_start (var_args, format);
  s = g_strdup_vprintf (format, var_args);
  if (f == NULL)
    {
      f = fopen ("/tmp/gdbus-completion-debug.txt", "a+");
    }
  fprintf (f, "%s\n", s);
  g_free (s);
}
#else
static void
completion_debug (const gchar *format, ...)
{
}
#endif

/* ---------------------------------------------------------------------------------------------------- */


static void
remove_arg (gint num, gint *argc, gchar **argv[])
{
  gint n;

  g_assert (num <= (*argc));

  for (n = num; (*argv)[n] != NULL; n++)
    (*argv)[n] = (*argv)[n+1];
  (*argv)[n] = NULL;
  (*argc) = (*argc) - 1;
}

static void
usage (gint *argc, gchar **argv[], gboolean use_stdout)
{
  GOptionContext *o;
  gchar *s;
  gchar *program_name;

  o = g_option_context_new (_("COMMAND"));
  g_option_context_set_help_enabled (o, FALSE);
  /* Ignore parsing result */
  g_option_context_parse (o, argc, argv, NULL);
  program_name = g_path_get_basename ((*argv)[0]);
  s = g_strdup_printf (_("Commands:\n"
                         "  help         Shows this information\n"
                         "  introspect   Introspect a remote object\n"
                         "  monitor      Monitor a remote object\n"
                         "  call         Invoke a method on a remote object\n"
                         "  emit         Emit a signal\n"
                         "  wait         Wait for a bus name to appear\n"
                         "\n"
                         "Use “%s COMMAND --help” to get help on each command.\n"),
                       program_name);
  g_free (program_name);
  g_option_context_set_description (o, s);
  g_free (s);
  s = g_option_context_get_help (o, FALSE, NULL);
  if (use_stdout)
    g_print ("%s", s);
  else
    g_printerr ("%s", s);
  g_free (s);
  g_option_context_free (o);
}

static void
modify_argv0_for_command (gint *argc, gchar **argv[], const gchar *command)
{
  gchar *s;
  gchar *program_name;

  /* TODO:
   *  1. get a g_set_prgname() ?; or
   *  2. save old argv[0] and restore later
   */

  g_assert (g_strcmp0 ((*argv)[1], command) == 0);
  remove_arg (1, argc, argv);

  program_name = g_path_get_basename ((*argv)[0]);
  s = g_strdup_printf ("%s %s", (*argv)[0], command);
  (*argv)[0] = s;
  g_free (program_name);
}

/* ---------------------------------------------------------------------------------------------------- */

static void
print_methods (GDBusConnection *c,
               const gchar *name,
               const gchar *path)
{
  GVariant *result;
  GError *error;
  const gchar *xml_data;
  GDBusNodeInfo *node;
  guint n;
  guint m;

  error = NULL;
  result = g_dbus_connection_call_sync (c,
                                        name,
                                        path,
                                        "org.freedesktop.DBus.Introspectable",
                                        "Introspect",
                                        NULL,
                                        G_VARIANT_TYPE ("(s)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 secs */
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }
  g_variant_get (result, "(&s)", &xml_data);

  error = NULL;
  node = g_dbus_node_info_new_for_xml (xml_data, &error);
  g_variant_unref (result);
  if (node == NULL)
    {
      g_printerr (_("Error parsing introspection XML: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }

  for (n = 0; node->interfaces != NULL && node->interfaces[n] != NULL; n++)
    {
      const GDBusInterfaceInfo *iface = node->interfaces[n];
      for (m = 0; iface->methods != NULL && iface->methods[m] != NULL; m++)
        {
          const GDBusMethodInfo *method = iface->methods[m];
          g_print ("%s.%s \n", iface->name, method->name);
        }
    }
  g_dbus_node_info_unref (node);

 out:
  ;
}

static void
print_paths (GDBusConnection *c,
             const gchar *name,
             const gchar *path)
{
  GVariant *result;
  GError *error;
  const gchar *xml_data;
  GDBusNodeInfo *node;
  guint n;

  if (!g_dbus_is_name (name))
    {
      g_printerr (_("Error: %s is not a valid name\n"), name);
      goto out;
    }

  error = NULL;
  result = g_dbus_connection_call_sync (c,
                                        name,
                                        path,
                                        "org.freedesktop.DBus.Introspectable",
                                        "Introspect",
                                        NULL,
                                        G_VARIANT_TYPE ("(s)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 secs */
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }
  g_variant_get (result, "(&s)", &xml_data);

  //g_printerr ("xml='%s'", xml_data);

  error = NULL;
  node = g_dbus_node_info_new_for_xml (xml_data, &error);
  g_variant_unref (result);
  if (node == NULL)
    {
      g_printerr (_("Error parsing introspection XML: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }

  //g_printerr ("bar '%s'\n", path);

  if (node->interfaces != NULL)
    g_print ("%s \n", path);

  for (n = 0; node->nodes != NULL && node->nodes[n] != NULL; n++)
    {
      gchar *s;

      //g_printerr ("foo '%s'\n", node->nodes[n].path);

      if (g_strcmp0 (path, "/") == 0)
        s = g_strdup_printf ("/%s", node->nodes[n]->path);
      else
        s = g_strdup_printf ("%s/%s", path, node->nodes[n]->path);

      print_paths (c, name, s);

      g_free (s);
    }
  g_dbus_node_info_unref (node);

 out:
  ;
}

static void
print_names (GDBusConnection *c,
             gboolean         include_unique_names)
{
  GVariant *result;
  GError *error;
  GVariantIter *iter;
  gchar *str;
  GHashTable *name_set;
  GList *keys;
  GList *l;

  name_set = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);

  error = NULL;
  result = g_dbus_connection_call_sync (c,
                                        "org.freedesktop.DBus",
                                        "/org/freedesktop/DBus",
                                        "org.freedesktop.DBus",
                                        "ListNames",
                                        NULL,
                                        G_VARIANT_TYPE ("(as)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 secs */
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }
  g_variant_get (result, "(as)", &iter);
  while (g_variant_iter_loop (iter, "s", &str))
    g_hash_table_insert (name_set, g_strdup (str), NULL);
  g_variant_iter_free (iter);
  g_variant_unref (result);

  error = NULL;
  result = g_dbus_connection_call_sync (c,
                                        "org.freedesktop.DBus",
                                        "/org/freedesktop/DBus",
                                        "org.freedesktop.DBus",
                                        "ListActivatableNames",
                                        NULL,
                                        G_VARIANT_TYPE ("(as)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 secs */
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }
  g_variant_get (result, "(as)", &iter);
  while (g_variant_iter_loop (iter, "s", &str))
    g_hash_table_insert (name_set, g_strdup (str), NULL);
  g_variant_iter_free (iter);
  g_variant_unref (result);

  keys = g_hash_table_get_keys (name_set);
  keys = g_list_sort (keys, (GCompareFunc) g_strcmp0);
  for (l = keys; l != NULL; l = l->next)
    {
      const gchar *name = l->data;
      if (!include_unique_names && g_str_has_prefix (name, ":"))
        continue;

      g_print ("%s \n", name);
    }
  g_list_free (keys);

 out:
  g_hash_table_unref (name_set);
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean  opt_connection_system  = FALSE;
static gboolean  opt_connection_session = FALSE;
static gchar    *opt_connection_address = NULL;

static const GOptionEntry connection_entries[] =
{
  { "system", 'y', 0, G_OPTION_ARG_NONE, &opt_connection_system, N_("Connect to the system bus"), NULL},
  { "session", 'e', 0, G_OPTION_ARG_NONE, &opt_connection_session, N_("Connect to the session bus"), NULL},
  { "address", 'a', 0, G_OPTION_ARG_STRING, &opt_connection_address, N_("Connect to given D-Bus address"), NULL},
  { NULL }
};

static GOptionGroup *
connection_get_group (void)
{
  static GOptionGroup *g;

  g = g_option_group_new ("connection",
                          N_("Connection Endpoint Options:"),
                          N_("Options specifying the connection endpoint"),
                          NULL,
                          NULL);
  g_option_group_set_translation_domain (g, GETTEXT_PACKAGE);
  g_option_group_add_entries (g, connection_entries);

  return g;
}

static GDBusConnection *
connection_get_dbus_connection (GError **error)
{
  GDBusConnection *c;

  c = NULL;

  /* First, ensure we have exactly one connect */
  if (!opt_connection_system && !opt_connection_session && opt_connection_address == NULL)
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_FAILED,
                   _("No connection endpoint specified"));
      goto out;
    }
  else if ((opt_connection_system && (opt_connection_session || opt_connection_address != NULL)) ||
           (opt_connection_session && (opt_connection_system || opt_connection_address != NULL)) ||
           (opt_connection_address != NULL && (opt_connection_system || opt_connection_session)))
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_FAILED,
                   _("Multiple connection endpoints specified"));
      goto out;
    }

  if (opt_connection_system)
    {
      c = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, error);
    }
  else if (opt_connection_session)
    {
      c = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, error);
    }
  else if (opt_connection_address != NULL)
    {
      c = g_dbus_connection_new_for_address_sync (opt_connection_address,
                                                  G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
                                                  NULL, /* GDBusAuthObserver */
                                                  NULL, /* GCancellable */
                                                  error);
    }

 out:
  return c;
}

/* ---------------------------------------------------------------------------------------------------- */

static GPtrArray *
call_helper_get_method_in_signature (GDBusConnection  *c,
                                     const gchar      *dest,
                                     const gchar      *path,
                                     const gchar      *interface_name,
                                     const gchar      *method_name,
                                     GError          **error)
{
  GPtrArray *ret;
  GVariant *result;
  GDBusNodeInfo *node_info;
  const gchar *xml_data;
  GDBusInterfaceInfo *interface_info;
  GDBusMethodInfo *method_info;
  guint n;

  ret = NULL;
  result = NULL;
  node_info = NULL;

  result = g_dbus_connection_call_sync (c,
                                        dest,
                                        path,
                                        "org.freedesktop.DBus.Introspectable",
                                        "Introspect",
                                        NULL,
                                        G_VARIANT_TYPE ("(s)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 secs */
                                        NULL,
                                        error);
  if (result == NULL)
    goto out;

  g_variant_get (result, "(&s)", &xml_data);
  node_info = g_dbus_node_info_new_for_xml (xml_data, error);
  if (node_info == NULL)
      goto out;

  interface_info = g_dbus_node_info_lookup_interface (node_info, interface_name);
  if (interface_info == NULL)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                   _("Warning: According to introspection data, interface “%s” does not exist\n"),
                   interface_name);
      goto out;
    }

  method_info = g_dbus_interface_info_lookup_method (interface_info, method_name);
  if (method_info == NULL)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
                   _("Warning: According to introspection data, method “%s” does not exist on interface “%s”\n"),
                   method_name,
                   interface_name);
      goto out;
    }

  ret = g_ptr_array_new_with_free_func ((GDestroyNotify) g_variant_type_free);
  for (n = 0; method_info->in_args != NULL && method_info->in_args[n] != NULL; n++)
    {
      g_ptr_array_add (ret, g_variant_type_new (method_info->in_args[n]->signature));
    }

 out:
  if (node_info != NULL)
    g_dbus_node_info_unref (node_info);
  if (result != NULL)
    g_variant_unref (result);

  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static GVariant *
_g_variant_parse_me_harder (GVariantType   *type,
                            const gchar    *given_str,
                            GError        **error)
{
  GVariant *value;
  gchar *s;
  guint n;
  GString *str;

  str = g_string_new ("\"");
  for (n = 0; given_str[n] != '\0'; n++)
    {
      if (G_UNLIKELY (given_str[n] == '\"'))
        g_string_append (str, "\\\"");
      else
        g_string_append_c (str, given_str[n]);
    }
  g_string_append_c (str, '"');
  s = g_string_free (str, FALSE);

  value = g_variant_parse (type,
                           s,
                           NULL,
                           NULL,
                           error);
  g_free (s);

  return value;
}

/* ---------------------------------------------------------------------------------------------------- */

static gchar *opt_emit_dest = NULL;
static gchar *opt_emit_object_path = NULL;
static gchar *opt_emit_signal = NULL;

static const GOptionEntry emit_entries[] =
{
  { "dest", 'd', 0, G_OPTION_ARG_STRING, &opt_emit_dest, N_("Optional destination for signal (unique name)"), NULL},
  { "object-path", 'o', 0, G_OPTION_ARG_STRING, &opt_emit_object_path, N_("Object path to emit signal on"), NULL},
  { "signal", 's', 0, G_OPTION_ARG_STRING, &opt_emit_signal, N_("Signal and interface name"), NULL},
  { NULL }
};

static gboolean
handle_emit (gint        *argc,
             gchar      **argv[],
             gboolean     request_completion,
             const gchar *completion_cur,
             const gchar *completion_prev)
{
  gint ret;
  GOptionContext *o;
  gchar *s;
  GError *error;
  GDBusConnection *c;
  GVariant *parameters;
  gchar *interface_name;
  gchar *signal_name;
  GVariantBuilder builder;
  gboolean skip_dashes;
  guint parm;
  guint n;

  ret = FALSE;
  c = NULL;
  parameters = NULL;
  interface_name = NULL;
  signal_name = NULL;

  modify_argv0_for_command (argc, argv, "emit");

  o = g_option_context_new (NULL);
  g_option_context_set_help_enabled (o, FALSE);
  g_option_context_set_summary (o, _("Emit a signal."));
  g_option_context_add_main_entries (o, emit_entries, GETTEXT_PACKAGE);
  g_option_context_add_group (o, connection_get_group ());

  if (!g_option_context_parse (o, argc, argv, NULL))
    {
      if (!request_completion)
        {
          s = g_option_context_get_help (o, FALSE, NULL);
          g_printerr ("%s", s);
          g_free (s);
          goto out;
        }
    }

  error = NULL;
  c = connection_get_dbus_connection (&error);
  if (c == NULL)
    {
      if (request_completion)
        {
          if (g_strcmp0 (completion_prev, "--address") == 0)
            {
              g_print ("unix:\n"
                       "tcp:\n"
                       "nonce-tcp:\n");
            }
          else
            {
              g_print ("--system \n--session \n--address \n");
            }
        }
      else
        {
          g_printerr (_("Error connecting: %s\n"), error->message);
          g_error_free (error);
        }
      goto out;
    }

  /* All done with completion now */
  if (request_completion)
    goto out;

  if (opt_emit_object_path == NULL)
    {
      g_printerr (_("Error: object path not specified.\n"));
      goto out;
    }
  if (!g_variant_is_object_path (opt_emit_object_path))
    {
      g_printerr (_("Error: %s is not a valid object path\n"), opt_emit_object_path);
      goto out;
    }

  if (opt_emit_signal == NULL)
    {
      g_printerr (_("Error: signal not specified.\n"));
      goto out;
    }

  s = strrchr (opt_emit_signal, '.');
  if (s == NULL)
    {
      g_printerr (_("Error: signal must be the fully-qualified name.\n"));
      goto out;
    }
  signal_name = g_strdup (s + 1);
  interface_name = g_strndup (opt_emit_signal, s - opt_emit_signal);

  if (!g_dbus_is_interface_name (interface_name))
    {
      g_printerr (_("Error: %s is not a valid interface name\n"), interface_name);
      goto out;
    }

  if (!g_dbus_is_member_name (signal_name))
    {
      g_printerr (_("Error: %s is not a valid member name\n"), signal_name);
      goto out;
    }

  if (opt_emit_dest != NULL && !g_dbus_is_unique_name (opt_emit_dest))
    {
      g_printerr (_("Error: %s is not a valid unique bus name.\n"), opt_emit_dest);
      goto out;
    }

  /* Read parameters */
  g_variant_builder_init (&builder, G_VARIANT_TYPE_TUPLE);
  skip_dashes = TRUE;
  parm = 0;
  for (n = 1; n < (guint) *argc; n++)
    {
      GVariant *value;

      /* Under certain conditions, g_option_context_parse returns the "--"
         itself (setting off unparsed arguments), too: */
      if (skip_dashes && g_strcmp0 ((*argv)[n], "--") == 0)
        {
          skip_dashes = FALSE;
          continue;
        }

      error = NULL;
      value = g_variant_parse (NULL,
                               (*argv)[n],
                               NULL,
                               NULL,
                               &error);
      if (value == NULL)
        {
          gchar *context;

          context = g_variant_parse_error_print_context (error, (*argv)[n]);
          g_error_free (error);
          error = NULL;
          value = _g_variant_parse_me_harder (NULL, (*argv)[n], &error);
          if (value == NULL)
            {
              /* Use the original non-"parse-me-harder" error */
              g_printerr (_("Error parsing parameter %d: %s\n"),
                          parm + 1,
                          context);
              g_error_free (error);
              g_free (context);
              g_variant_builder_clear (&builder);
              goto out;
            }
          g_free (context);
        }
      g_variant_builder_add_value (&builder, value);
      ++parm;
    }
  parameters = g_variant_builder_end (&builder);

  if (parameters != NULL)
    parameters = g_variant_ref_sink (parameters);
  if (!g_dbus_connection_emit_signal (c,
                                      opt_emit_dest,
                                      opt_emit_object_path,
                                      interface_name,
                                      signal_name,
                                      parameters,
                                      &error))
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }

  if (!g_dbus_connection_flush_sync (c, NULL, &error))
    {
      g_printerr (_("Error flushing connection: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }

  ret = TRUE;

 out:
  if (c != NULL)
    g_object_unref (c);
  if (parameters != NULL)
    g_variant_unref (parameters);
  g_free (interface_name);
  g_free (signal_name);
  g_option_context_free (o);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static gchar *opt_call_dest = NULL;
static gchar *opt_call_object_path = NULL;
static gchar *opt_call_method = NULL;
static gint opt_call_timeout = -1;

static const GOptionEntry call_entries[] =
{
  { "dest", 'd', 0, G_OPTION_ARG_STRING, &opt_call_dest, N_("Destination name to invoke method on"), NULL},
  { "object-path", 'o', 0, G_OPTION_ARG_STRING, &opt_call_object_path, N_("Object path to invoke method on"), NULL},
  { "method", 'm', 0, G_OPTION_ARG_STRING, &opt_call_method, N_("Method and interface name"), NULL},
  { "timeout", 't', 0, G_OPTION_ARG_INT, &opt_call_timeout, N_("Timeout in seconds"), NULL},
  { NULL }
};

static gboolean
handle_call (gint        *argc,
             gchar      **argv[],
             gboolean     request_completion,
             const gchar *completion_cur,
             const gchar *completion_prev)
{
  gint ret;
  GOptionContext *o;
  gchar *s;
  GError *error;
  GDBusConnection *c;
  GVariant *parameters;
  gchar *interface_name;
  gchar *method_name;
  GVariant *result;
  GPtrArray *in_signature_types;
  gboolean complete_names;
  gboolean complete_paths;
  gboolean complete_methods;
  GVariantBuilder builder;
  gboolean skip_dashes;
  guint parm;
  guint n;

  ret = FALSE;
  c = NULL;
  parameters = NULL;
  interface_name = NULL;
  method_name = NULL;
  result = NULL;
  in_signature_types = NULL;

  modify_argv0_for_command (argc, argv, "call");

  o = g_option_context_new (NULL);
  g_option_context_set_help_enabled (o, FALSE);
  g_option_context_set_summary (o, _("Invoke a method on a remote object."));
  g_option_context_add_main_entries (o, call_entries, GETTEXT_PACKAGE);
  g_option_context_add_group (o, connection_get_group ());

  complete_names = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--dest") == 0)
    {
      complete_names = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  complete_paths = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--object-path") == 0)
    {
      complete_paths = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  complete_methods = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--method") == 0)
    {
      complete_methods = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  if (!g_option_context_parse (o, argc, argv, NULL))
    {
      if (!request_completion)
        {
          s = g_option_context_get_help (o, FALSE, NULL);
          g_printerr ("%s", s);
          g_free (s);
          goto out;
        }
    }

  error = NULL;
  c = connection_get_dbus_connection (&error);
  if (c == NULL)
    {
      if (request_completion)
        {
          if (g_strcmp0 (completion_prev, "--address") == 0)
            {
              g_print ("unix:\n"
                       "tcp:\n"
                       "nonce-tcp:\n");
            }
          else
            {
              g_print ("--system \n--session \n--address \n");
            }
        }
      else
        {
          g_printerr (_("Error connecting: %s\n"), error->message);
          g_error_free (error);
        }
      goto out;
    }

  /* validate and complete destination (bus name) */
  if (g_dbus_connection_get_unique_name (c) != NULL)
    {
      /* this only makes sense on message bus connections */
      if (complete_names)
        {
          print_names (c, FALSE);
          goto out;
        }
      if (opt_call_dest == NULL)
        {
          if (request_completion)
            g_print ("--dest \n");
          else
            g_printerr (_("Error: Destination is not specified\n"));
          goto out;
        }
      if (request_completion && g_strcmp0 ("--dest", completion_prev) == 0)
        {
          print_names (c, g_str_has_prefix (opt_call_dest, ":"));
          goto out;
        }
    }

  if (!request_completion && !g_dbus_is_name (opt_call_dest))
    {
      g_printerr (_("Error: %s is not a valid bus name\n"), opt_call_dest);
      goto out;
    }

  /* validate and complete object path */
  if (complete_paths)
    {
      print_paths (c, opt_call_dest, "/");
      goto out;
    }
  if (opt_call_object_path == NULL)
    {
      if (request_completion)
        g_print ("--object-path \n");
      else
        g_printerr (_("Error: Object path is not specified\n"));
      goto out;
    }
  if (request_completion && g_strcmp0 ("--object-path", completion_prev) == 0)
    {
      gchar *p;
      s = g_strdup (opt_call_object_path);
      p = strrchr (s, '/');
      if (p != NULL)
        {
          if (p == s)
            p++;
          *p = '\0';
        }
      print_paths (c, opt_call_dest, s);
      g_free (s);
      goto out;
    }
  if (!request_completion && !g_variant_is_object_path (opt_call_object_path))
    {
      g_printerr (_("Error: %s is not a valid object path\n"), opt_call_object_path);
      goto out;
    }

  /* validate and complete method (interface + method name) */
  if (complete_methods)
    {
      print_methods (c, opt_call_dest, opt_call_object_path);
      goto out;
    }
  if (opt_call_method == NULL)
    {
      if (request_completion)
        g_print ("--method \n");
      else
        g_printerr (_("Error: Method name is not specified\n"));
      goto out;
    }
  if (request_completion && g_strcmp0 ("--method", completion_prev) == 0)
    {
      print_methods (c, opt_call_dest, opt_call_object_path);
      goto out;
    }
  s = strrchr (opt_call_method, '.');
  if (!request_completion && s == NULL)
    {
      g_printerr (_("Error: Method name “%s” is invalid\n"), opt_call_method);
      goto out;
    }
  method_name = g_strdup (s + 1);
  interface_name = g_strndup (opt_call_method, s - opt_call_method);

  /* All done with completion now */
  if (request_completion)
    goto out;

  /* Introspect, for easy conversion - it's not fatal if we can't do this */
  in_signature_types = call_helper_get_method_in_signature (c,
                                                            opt_call_dest,
                                                            opt_call_object_path,
                                                            interface_name,
                                                            method_name,
                                                            &error);
  if (in_signature_types == NULL)
    {
      //g_printerr ("Error getting introspection data: %s\n", error->message);
      g_error_free (error);
      error = NULL;
    }

  /* Read parameters */
  g_variant_builder_init (&builder, G_VARIANT_TYPE_TUPLE);
  skip_dashes = TRUE;
  parm = 0;
  for (n = 1; n < (guint) *argc; n++)
    {
      GVariant *value;
      GVariantType *type;

      /* Under certain conditions, g_option_context_parse returns the "--"
         itself (setting off unparsed arguments), too: */
      if (skip_dashes && g_strcmp0 ((*argv)[n], "--") == 0)
        {
          skip_dashes = FALSE;
          continue;
        }

      type = NULL;
      if (in_signature_types != NULL)
        {
          if (parm >= in_signature_types->len)
            {
              /* Only warn for the first param */
              if (parm == in_signature_types->len)
                {
                  g_printerr ("Warning: Introspection data indicates %d parameters but more was passed\n",
                              in_signature_types->len);
                }
            }
          else
            {
              type = in_signature_types->pdata[parm];
            }
        }

      error = NULL;
      value = g_variant_parse (type,
                               (*argv)[n],
                               NULL,
                               NULL,
                               &error);
      if (value == NULL)
        {
          gchar *context;

          context = g_variant_parse_error_print_context (error, (*argv)[n]);
          g_error_free (error);
          error = NULL;
          value = _g_variant_parse_me_harder (type, (*argv)[n], &error);
          if (value == NULL)
            {
              if (type != NULL)
                {
                  s = g_variant_type_dup_string (type);
                  g_printerr (_("Error parsing parameter %d of type “%s”: %s\n"),
                              parm + 1,
                              s,
                              context);
                  g_free (s);
                }
              else
                {
                  g_printerr (_("Error parsing parameter %d: %s\n"),
                              parm + 1,
                              context);
                }
              g_error_free (error);
              g_variant_builder_clear (&builder);
              g_free (context);
              goto out;
            }
          g_free (context);
        }
      g_variant_builder_add_value (&builder, value);
      ++parm;
    }
  parameters = g_variant_builder_end (&builder);

  if (parameters != NULL)
    parameters = g_variant_ref_sink (parameters);
  result = g_dbus_connection_call_sync (c,
                                        opt_call_dest,
                                        opt_call_object_path,
                                        interface_name,
                                        method_name,
                                        parameters,
                                        NULL,
                                        G_DBUS_CALL_FLAGS_NONE,
                                        opt_call_timeout > 0 ? opt_call_timeout * 1000 : opt_call_timeout,
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);

      if (g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS) && in_signature_types != NULL)
        {
          if (in_signature_types->len > 0)
            {
              GString *s;
              s = g_string_new (NULL);

              for (n = 0; n < in_signature_types->len; n++)
                {
                  GVariantType *type = in_signature_types->pdata[n];
                  g_string_append_len (s,
                                       g_variant_type_peek_string (type),
                                       g_variant_type_get_string_length (type));
                }

              g_printerr ("(According to introspection data, you need to pass '%s')\n", s->str);
              g_string_free (s, TRUE);
            }
          else
            g_printerr ("(According to introspection data, you need to pass no arguments)\n");
        }

      g_error_free (error);
      goto out;
    }

  s = g_variant_print (result, TRUE);
  g_print ("%s\n", s);
  g_free (s);

  ret = TRUE;

 out:
  if (in_signature_types != NULL)
    g_ptr_array_unref (in_signature_types);
  if (result != NULL)
    g_variant_unref (result);
  if (c != NULL)
    g_object_unref (c);
  if (parameters != NULL)
    g_variant_unref (parameters);
  g_free (interface_name);
  g_free (method_name);
  g_option_context_free (o);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static gchar *opt_introspect_dest = NULL;
static gchar *opt_introspect_object_path = NULL;
static gboolean opt_introspect_xml = FALSE;
static gboolean opt_introspect_recurse = FALSE;
static gboolean opt_introspect_only_properties = FALSE;

static void
dump_annotation (const GDBusAnnotationInfo *o,
                 guint indent,
                 gboolean ignore_indent)
{
  guint n;
  g_print ("%*s@%s(\"%s\")\n",
           ignore_indent ? 0 : indent, "",
           o->key,
           o->value);
  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent + 2, FALSE);
}

static void
dump_arg (const GDBusArgInfo *o,
          guint indent,
          const gchar *direction,
          gboolean ignore_indent,
          gboolean include_newline)
{
  guint n;

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    {
      dump_annotation (o->annotations[n], indent, ignore_indent);
      ignore_indent = FALSE;
    }

  g_print ("%*s%s%s %s%s",
           ignore_indent ? 0 : indent, "",
           direction,
           o->signature,
           o->name,
           include_newline ? ",\n" : "");
}

static guint
count_args (GDBusArgInfo **args)
{
  guint n;
  n = 0;
  if (args == NULL)
    goto out;
  while (args[n] != NULL)
    n++;
 out:
  return n;
}

static void
dump_method (const GDBusMethodInfo *o,
             guint                  indent)
{
  guint n;
  guint m;
  guint name_len;
  guint total_num_args;

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent, FALSE);

  g_print ("%*s%s(", indent, "", o->name);
  name_len = strlen (o->name);
  total_num_args = count_args (o->in_args) + count_args (o->out_args);
  for (n = 0, m = 0; o->in_args != NULL && o->in_args[n] != NULL; n++, m++)
    {
      gboolean ignore_indent = (m == 0);
      gboolean include_newline = (m != total_num_args - 1);

      dump_arg (o->in_args[n],
                indent + name_len + 1,
                "in  ",
                ignore_indent,
                include_newline);
    }
  for (n = 0; o->out_args != NULL && o->out_args[n] != NULL; n++, m++)
    {
      gboolean ignore_indent = (m == 0);
      gboolean include_newline = (m != total_num_args - 1);
      dump_arg (o->out_args[n],
                indent + name_len + 1,
                "out ",
                ignore_indent,
                include_newline);
    }
  g_print (");\n");
}

static void
dump_signal (const GDBusSignalInfo *o,
             guint                  indent)
{
  guint n;
  guint name_len;
  guint total_num_args;

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent, FALSE);

  g_print ("%*s%s(", indent, "", o->name);
  name_len = strlen (o->name);
  total_num_args = count_args (o->args);
  for (n = 0; o->args != NULL && o->args[n] != NULL; n++)
    {
      gboolean ignore_indent = (n == 0);
      gboolean include_newline = (n != total_num_args - 1);
      dump_arg (o->args[n],
                indent + name_len + 1,
                "",
                ignore_indent,
                include_newline);
    }
  g_print (");\n");
}

static void
dump_property (const GDBusPropertyInfo *o,
               guint                    indent,
               GVariant                *value)
{
  const gchar *access;
  guint n;

  if (o->flags == G_DBUS_PROPERTY_INFO_FLAGS_READABLE)
    access = "readonly";
  else if (o->flags == G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE)
    access = "writeonly";
  else if (o->flags == (G_DBUS_PROPERTY_INFO_FLAGS_READABLE | G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE))
    access = "readwrite";
  else
    g_assert_not_reached ();

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent, FALSE);

  if (value != NULL)
    {
      gchar *s = g_variant_print (value, FALSE);
      g_print ("%*s%s %s %s = %s;\n", indent, "", access, o->signature, o->name, s);
      g_free (s);
    }
  else
    {
      g_print ("%*s%s %s %s;\n", indent, "", access, o->signature, o->name);
    }
}

static void
dump_interface (GDBusConnection          *c,
                const gchar              *name,
                const GDBusInterfaceInfo *o,
                guint                     indent,
                const gchar              *object_path)
{
  guint n;
  GHashTable *properties;

  properties = g_hash_table_new_full (g_str_hash,
                                      g_str_equal,
                                      g_free,
                                      (GDestroyNotify) g_variant_unref);

  /* Try to get properties */
  if (c != NULL && name != NULL && object_path != NULL && o->properties != NULL)
    {
      GVariant *result;
      result = g_dbus_connection_call_sync (c,
                                            name,
                                            object_path,
                                            "org.freedesktop.DBus.Properties",
                                            "GetAll",
                                            g_variant_new ("(s)", o->name),
                                            NULL,
                                            G_DBUS_CALL_FLAGS_NONE,
                                            3000,
                                            NULL,
                                            NULL);
      if (result != NULL)
        {
          if (g_variant_is_of_type (result, G_VARIANT_TYPE ("(a{sv})")))
            {
              GVariantIter *iter;
              GVariant *item;
              g_variant_get (result,
                             "(a{sv})",
                             &iter);
              while ((item = g_variant_iter_next_value (iter)))
                {
                  gchar *key;
                  GVariant *value;
                  g_variant_get (item,
                                 "{sv}",
                                 &key,
                                 &value);

                  g_hash_table_insert (properties, key, g_variant_ref (value));
                }
            }
          g_variant_unref (result);
        }
      else
        {
          guint n;
          for (n = 0; o->properties != NULL && o->properties[n] != NULL; n++)
            {
              result = g_dbus_connection_call_sync (c,
                                                    name,
                                                    object_path,
                                                    "org.freedesktop.DBus.Properties",
                                                    "Get",
                                                    g_variant_new ("(ss)", o->name, o->properties[n]->name),
                                                    G_VARIANT_TYPE ("(v)"),
                                                    G_DBUS_CALL_FLAGS_NONE,
                                                    3000,
                                                    NULL,
                                                    NULL);
              if (result != NULL)
                {
                  GVariant *property_value;
                  g_variant_get (result,
                                 "(v)",
                                 &property_value);
                  g_hash_table_insert (properties,
                                       g_strdup (o->properties[n]->name),
                                       g_variant_ref (property_value));
                  g_variant_unref (result);
                }
            }
        }
    }

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent, FALSE);

  g_print ("%*sinterface %s {\n", indent, "", o->name);
  if (o->methods != NULL && !opt_introspect_only_properties)
    {
      g_print ("%*s  methods:\n", indent, "");
      for (n = 0; o->methods[n] != NULL; n++)
        dump_method (o->methods[n], indent + 4);
    }
  if (o->signals != NULL && !opt_introspect_only_properties)
    {
      g_print ("%*s  signals:\n", indent, "");
      for (n = 0; o->signals[n] != NULL; n++)
        dump_signal (o->signals[n], indent + 4);
    }
  if (o->properties != NULL)
    {
      g_print ("%*s  properties:\n", indent, "");
      for (n = 0; o->properties[n] != NULL; n++)
        {
          dump_property (o->properties[n],
                         indent + 4,
                         g_hash_table_lookup (properties, (o->properties[n])->name));
        }
    }
  g_print ("%*s};\n",
           indent, "");

  g_hash_table_unref (properties);
}

static gboolean
introspect_do (GDBusConnection *c,
               const gchar     *object_path,
               guint            indent);

static void
dump_node (GDBusConnection      *c,
           const gchar          *name,
           const GDBusNodeInfo  *o,
           guint                 indent,
           const gchar          *object_path,
           gboolean              recurse)
{
  guint n;
  const gchar *object_path_to_print;

  object_path_to_print = object_path;
  if (o->path != NULL)
    object_path_to_print = o->path;

  for (n = 0; o->annotations != NULL && o->annotations[n] != NULL; n++)
    dump_annotation (o->annotations[n], indent, FALSE);

  g_print ("%*snode %s", indent, "", object_path_to_print != NULL ? object_path_to_print : "(not set)");
  if (o->interfaces != NULL || o->nodes != NULL)
    {
      g_print (" {\n");
      for (n = 0; o->interfaces != NULL && o->interfaces[n] != NULL; n++)
        {
          if (opt_introspect_only_properties)
            {
              if (o->interfaces[n]->properties != NULL && o->interfaces[n]->properties[0] != NULL)
                dump_interface (c, name, o->interfaces[n], indent + 2, object_path);
            }
          else
            {
              dump_interface (c, name, o->interfaces[n], indent + 2, object_path);
            }
        }
      for (n = 0; o->nodes != NULL && o->nodes[n] != NULL; n++)
        {
          if (recurse)
            {
              gchar *child_path;
              if (g_variant_is_object_path (o->nodes[n]->path))
                {
                  child_path = g_strdup (o->nodes[n]->path);
                  /* avoid infinite loops */
                  if (g_str_has_prefix (child_path, object_path))
                    {
                      introspect_do (c, child_path, indent + 2);
                    }
                  else
                    {
                      g_print ("Skipping path %s that is not enclosed by parent %s\n",
                               child_path, object_path);
                    }
                }
              else
                {
                  if (g_strcmp0 (object_path, "/") == 0)
                    child_path = g_strdup_printf ("/%s", o->nodes[n]->path);
                  else
                    child_path = g_strdup_printf ("%s/%s", object_path, o->nodes[n]->path);
                  introspect_do (c, child_path, indent + 2);
                }
              g_free (child_path);
            }
          else
            {
              dump_node (NULL, NULL, o->nodes[n], indent + 2, NULL, recurse);
            }
        }
      g_print ("%*s};\n",
               indent, "");
    }
  else
    {
      g_print ("\n");
    }
}

static const GOptionEntry introspect_entries[] =
{
  { "dest", 'd', 0, G_OPTION_ARG_STRING, &opt_introspect_dest, N_("Destination name to introspect"), NULL},
  { "object-path", 'o', 0, G_OPTION_ARG_STRING, &opt_introspect_object_path, N_("Object path to introspect"), NULL},
  { "xml", 'x', 0, G_OPTION_ARG_NONE, &opt_introspect_xml, N_("Print XML"), NULL},
  { "recurse", 'r', 0, G_OPTION_ARG_NONE, &opt_introspect_recurse, N_("Introspect children"), NULL},
  { "only-properties", 'p', 0, G_OPTION_ARG_NONE, &opt_introspect_only_properties, N_("Only print properties"), NULL},
  { NULL }
};

static gboolean
introspect_do (GDBusConnection *c,
               const gchar     *object_path,
               guint            indent)
{
  GError *error;
  GVariant *result;
  GDBusNodeInfo *node;
  gboolean ret;
  const gchar *xml_data;

  ret = FALSE;
  node = NULL;
  result = NULL;

  error = NULL;
  result = g_dbus_connection_call_sync (c,
                                        opt_introspect_dest,
                                        object_path,
                                        "org.freedesktop.DBus.Introspectable",
                                        "Introspect",
                                        NULL,
                                        G_VARIANT_TYPE ("(s)"),
                                        G_DBUS_CALL_FLAGS_NONE,
                                        3000, /* 3 sec */
                                        NULL,
                                        &error);
  if (result == NULL)
    {
      g_printerr (_("Error: %s\n"), error->message);
      g_error_free (error);
      goto out;
    }
  g_variant_get (result, "(&s)", &xml_data);

  if (opt_introspect_xml)
    {
      g_print ("%s", xml_data);
    }
  else
    {
      error = NULL;
      node = g_dbus_node_info_new_for_xml (xml_data, &error);
      if (node == NULL)
        {
          g_printerr (_("Error parsing introspection XML: %s\n"), error->message);
          g_error_free (error);
          goto out;
        }

      dump_node (c, opt_introspect_dest, node, indent, object_path, opt_introspect_recurse);
    }

  ret = TRUE;

 out:
  if (node != NULL)
    g_dbus_node_info_unref (node);
  if (result != NULL)
    g_variant_unref (result);
  return ret;
}

static gboolean
handle_introspect (gint        *argc,
                   gchar      **argv[],
                   gboolean     request_completion,
                   const gchar *completion_cur,
                   const gchar *completion_prev)
{
  gint ret;
  GOptionContext *o;
  gchar *s;
  GError *error;
  GDBusConnection *c;
  gboolean complete_names;
  gboolean complete_paths;

  ret = FALSE;
  c = NULL;

  modify_argv0_for_command (argc, argv, "introspect");

  o = g_option_context_new (NULL);
  if (request_completion)
    g_option_context_set_ignore_unknown_options (o, TRUE);
  g_option_context_set_help_enabled (o, FALSE);
  g_option_context_set_summary (o, _("Introspect a remote object."));
  g_option_context_add_main_entries (o, introspect_entries, GETTEXT_PACKAGE);
  g_option_context_add_group (o, connection_get_group ());

  complete_names = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--dest") == 0)
    {
      complete_names = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  complete_paths = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--object-path") == 0)
    {
      complete_paths = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  if (!g_option_context_parse (o, argc, argv, NULL))
    {
      if (!request_completion)
        {
          s = g_option_context_get_help (o, FALSE, NULL);
          g_printerr ("%s", s);
          g_free (s);
          goto out;
        }
    }

  error = NULL;
  c = connection_get_dbus_connection (&error);
  if (c == NULL)
    {
      if (request_completion)
        {
          if (g_strcmp0 (completion_prev, "--address") == 0)
            {
              g_print ("unix:\n"
                       "tcp:\n"
                       "nonce-tcp:\n");
            }
          else
            {
              g_print ("--system \n--session \n--address \n");
            }
        }
      else
        {
          g_printerr (_("Error connecting: %s\n"), error->message);
          g_error_free (error);
        }
      goto out;
    }

  if (g_dbus_connection_get_unique_name (c) != NULL)
    {
      if (complete_names)
        {
          print_names (c, FALSE);
          goto out;
        }
      /* this only makes sense on message bus connections */
      if (opt_introspect_dest == NULL)
        {
          if (request_completion)
            g_print ("--dest \n");
          else
            g_printerr (_("Error: Destination is not specified\n"));
          goto out;
        }
      if (request_completion && g_strcmp0 ("--dest", completion_prev) == 0)
        {
          print_names (c, g_str_has_prefix (opt_introspect_dest, ":"));
          goto out;
        }
    }
  if (complete_paths)
    {
      print_paths (c, opt_introspect_dest, "/");
      goto out;
    }

  if (!request_completion && !g_dbus_is_name (opt_introspect_dest))
    {
        g_printerr (_("Error: %s is not a valid bus name\n"), opt_introspect_dest);
      goto out;
    }

  if (opt_introspect_object_path == NULL)
    {
      if (request_completion)
        g_print ("--object-path \n");
      else
        g_printerr (_("Error: Object path is not specified\n"));
      goto out;
    }
  if (request_completion && g_strcmp0 ("--object-path", completion_prev) == 0)
    {
      gchar *p;
      s = g_strdup (opt_introspect_object_path);
      p = strrchr (s, '/');
      if (p != NULL)
        {
          if (p == s)
            p++;
          *p = '\0';
        }
      print_paths (c, opt_introspect_dest, s);
      g_free (s);
      goto out;
    }
  if (!request_completion && !g_variant_is_object_path (opt_introspect_object_path))
    {
      g_printerr (_("Error: %s is not a valid object path\n"), opt_introspect_object_path);
      goto out;
    }

  if (request_completion && opt_introspect_object_path != NULL && !opt_introspect_recurse)
    {
      g_print ("--recurse \n");
    }

  if (request_completion && opt_introspect_object_path != NULL && !opt_introspect_only_properties)
    {
      g_print ("--only-properties \n");
    }

  /* All done with completion now */
  if (request_completion)
    goto out;

  if (!introspect_do (c, opt_introspect_object_path, 0))
    goto out;

  ret = TRUE;

 out:
  if (c != NULL)
    g_object_unref (c);
  g_option_context_free (o);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static gchar *opt_monitor_dest = NULL;
static gchar *opt_monitor_object_path = NULL;

static guint monitor_filter_id = 0;

static void
monitor_signal_cb (GDBusConnection *connection,
                   const gchar     *sender_name,
                   const gchar     *object_path,
                   const gchar     *interface_name,
                   const gchar     *signal_name,
                   GVariant        *parameters,
                   gpointer         user_data)
{
  gchar *s;
  s = g_variant_print (parameters, TRUE);
  g_print ("%s: %s.%s %s\n",
           object_path,
           interface_name,
           signal_name,
           s);
  g_free (s);
}

static void
monitor_on_name_appeared (GDBusConnection *connection,
                          const gchar *name,
                          const gchar *name_owner,
                          gpointer user_data)
{
  g_print ("The name %s is owned by %s\n", name, name_owner);
  g_assert (monitor_filter_id == 0);
  monitor_filter_id = g_dbus_connection_signal_subscribe (connection,
                                                          name_owner,
                                                          NULL,  /* any interface */
                                                          NULL,  /* any member */
                                                          opt_monitor_object_path,
                                                          NULL,  /* arg0 */
                                                          G_DBUS_SIGNAL_FLAGS_NONE,
                                                          monitor_signal_cb,
                                                          NULL,  /* user_data */
                                                          NULL); /* user_data destroy notify */
}

static void
monitor_on_name_vanished (GDBusConnection *connection,
                          const gchar *name,
                          gpointer user_data)
{
  g_print ("The name %s does not have an owner\n", name);

  if (monitor_filter_id != 0)
    {
      g_dbus_connection_signal_unsubscribe (connection, monitor_filter_id);
      monitor_filter_id = 0;
    }
}

static const GOptionEntry monitor_entries[] =
{
  { "dest", 'd', 0, G_OPTION_ARG_STRING, &opt_monitor_dest, N_("Destination name to monitor"), NULL},
  { "object-path", 'o', 0, G_OPTION_ARG_STRING, &opt_monitor_object_path, N_("Object path to monitor"), NULL},
  { NULL }
};

static gboolean
handle_monitor (gint        *argc,
                gchar      **argv[],
                gboolean     request_completion,
                const gchar *completion_cur,
                const gchar *completion_prev)
{
  gint ret;
  GOptionContext *o;
  gchar *s;
  GError *error;
  GDBusConnection *c;
  gboolean complete_names;
  gboolean complete_paths;
  GMainLoop *loop;

  ret = FALSE;
  c = NULL;

  modify_argv0_for_command (argc, argv, "monitor");

  o = g_option_context_new (NULL);
  if (request_completion)
    g_option_context_set_ignore_unknown_options (o, TRUE);
  g_option_context_set_help_enabled (o, FALSE);
  g_option_context_set_summary (o, _("Monitor a remote object."));
  g_option_context_add_main_entries (o, monitor_entries, GETTEXT_PACKAGE);
  g_option_context_add_group (o, connection_get_group ());

  complete_names = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--dest") == 0)
    {
      complete_names = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  complete_paths = FALSE;
  if (request_completion && *argc > 1 && g_strcmp0 ((*argv)[(*argc)-1], "--object-path") == 0)
    {
      complete_paths = TRUE;
      remove_arg ((*argc) - 1, argc, argv);
    }

  if (!g_option_context_parse (o, argc, argv, NULL))
    {
      if (!request_completion)
        {
          s = g_option_context_get_help (o, FALSE, NULL);
          g_printerr ("%s", s);
          g_free (s);
          goto out;
        }
    }

  error = NULL;
  c = connection_get_dbus_connection (&error);
  if (c == NULL)
    {
      if (request_completion)
        {
          if (g_strcmp0 (completion_prev, "--address") == 0)
            {
              g_print ("unix:\n"
                       "tcp:\n"
                       "nonce-tcp:\n");
            }
          else
            {
              g_print ("--system \n--session \n--address \n");
            }
        }
      else
        {
          g_printerr (_("Error connecting: %s\n"), error->message);
          g_error_free (error);
        }
      goto out;
    }

  if (g_dbus_connection_get_unique_name (c) != NULL)
    {
      if (complete_names)
        {
          print_names (c, FALSE);
          goto out;
        }
      /* this only makes sense on message bus connections */
      if (opt_monitor_dest == NULL)
        {
          if (request_completion)
            g_print ("--dest \n");
          else
            g_printerr (_("Error: Destination is not specified\n"));
          goto out;
        }
      if (request_completion && g_strcmp0 ("--dest", completion_prev) == 0)
        {
          print_names (c, g_str_has_prefix (opt_monitor_dest, ":"));
          goto out;
        }
    }

  if (!request_completion && !g_dbus_is_name (opt_monitor_dest))
    {
      g_printerr (_("Error: %s is not a valid bus name\n"), opt_monitor_dest);
      goto out;
    }

  if (complete_paths)
    {
      print_paths (c, opt_monitor_dest, "/");
      goto out;
    }
  if (opt_monitor_object_path == NULL)
    {
      if (request_completion)
        {
          g_print ("--object-path \n");
          goto out;
        }
      /* it's fine to not have an object path */
    }
  if (request_completion && g_strcmp0 ("--object-path", completion_prev) == 0)
    {
      gchar *p;
      s = g_strdup (opt_monitor_object_path);
      p = strrchr (s, '/');
      if (p != NULL)
        {
          if (p == s)
            p++;
          *p = '\0';
        }
      print_paths (c, opt_monitor_dest, s);
      g_free (s);
      goto out;
    }
  if (!request_completion && (opt_monitor_object_path != NULL && !g_variant_is_object_path (opt_monitor_object_path)))
    {
      g_printerr (_("Error: %s is not a valid object path\n"), opt_monitor_object_path);
      goto out;
    }

  /* All done with completion now */
  if (request_completion)
    goto out;

  if (opt_monitor_object_path != NULL)
    g_print ("Monitoring signals on object %s owned by %s\n", opt_monitor_object_path, opt_monitor_dest);
  else
    g_print ("Monitoring signals from all objects owned by %s\n", opt_monitor_dest);

  loop = g_main_loop_new (NULL, FALSE);
  g_bus_watch_name_on_connection (c,
                                  opt_monitor_dest,
                                  G_BUS_NAME_WATCHER_FLAGS_AUTO_START,
                                  monitor_on_name_appeared,
                                  monitor_on_name_vanished,
                                  NULL,
                                  NULL);

  g_main_loop_run (loop);
  g_main_loop_unref (loop);

  ret = TRUE;

 out:
  if (c != NULL)
    g_object_unref (c);
  g_option_context_free (o);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean opt_wait_activate_set = FALSE;
static gchar *opt_wait_activate_name = NULL;
static gint64 opt_wait_timeout = 0;  /* no timeout */

typedef enum {
  WAIT_STATE_RUNNING,  /* waiting to see the service */
  WAIT_STATE_SUCCESS,  /* seen it successfully */
  WAIT_STATE_TIMEOUT,  /* timed out before seeing it */
} WaitState;

static gboolean
opt_wait_activate_cb (const gchar  *option_name,
                      const gchar  *value,
                      gpointer      data,
                      GError      **error)
{
  /* @value may be NULL */
  opt_wait_activate_set = TRUE;
  opt_wait_activate_name = g_strdup (value);

  return TRUE;
}

static const GOptionEntry wait_entries[] =
{
  { "activate", 'a', G_OPTION_FLAG_OPTIONAL_ARG, G_OPTION_ARG_CALLBACK,
    opt_wait_activate_cb,
    N_("Service to activate before waiting for the other one (well-known name)"),
    "[NAME]" },
  { "timeout", 't', 0, G_OPTION_ARG_INT64, &opt_wait_timeout,
    N_("Timeout to wait for before exiting with an error (seconds); 0 for "
       "no timeout (default)"), "SECS" },
  { NULL }
};

static void
wait_name_appeared_cb (GDBusConnection *connection,
                       const gchar     *name,
                       const gchar     *name_owner,
                       gpointer         user_data)
{
  WaitState *wait_state = user_data;

  *wait_state = WAIT_STATE_SUCCESS;
}

static gboolean
wait_timeout_cb (gpointer user_data)
{
  WaitState *wait_state = user_data;

  *wait_state = WAIT_STATE_TIMEOUT;

  /* Removed in handle_wait(). */
  return G_SOURCE_CONTINUE;
}

static gboolean
handle_wait (gint        *argc,
             gchar      **argv[],
             gboolean     request_completion,
             const gchar *completion_cur,
             const gchar *completion_prev)
{
  gint ret;
  GOptionContext *o;
  gchar *s;
  GError *error;
  GDBusConnection *c;
  guint watch_id, timer_id = 0, activate_watch_id;
  const gchar *activate_service, *wait_service;
  WaitState wait_state = WAIT_STATE_RUNNING;

  ret = FALSE;
  c = NULL;

  modify_argv0_for_command (argc, argv, "wait");

  o = g_option_context_new (_("[OPTION…] BUS-NAME"));
  g_option_context_set_help_enabled (o, FALSE);
  g_option_context_set_summary (o, _("Wait for a bus name to appear."));
  g_option_context_add_main_entries (o, wait_entries, GETTEXT_PACKAGE);
  g_option_context_add_group (o, connection_get_group ());

  if (!g_option_context_parse (o, argc, argv, NULL))
    {
      if (!request_completion)
        {
          s = g_option_context_get_help (o, FALSE, NULL);
          g_printerr ("%s", s);
          g_free (s);
          goto out;
        }
    }

  error = NULL;
  c = connection_get_dbus_connection (&error);
  if (c == NULL)
    {
      if (request_completion)
        {
          if (g_strcmp0 (completion_prev, "--address") == 0)
            {
              g_print ("unix:\n"
                       "tcp:\n"
                       "nonce-tcp:\n");
            }
          else
            {
              g_print ("--system \n--session \n--address \n");
            }
        }
      else
        {
          g_printerr (_("Error connecting: %s\n"), error->message);
          g_error_free (error);
        }
      goto out;
    }

  /* All done with completion now */
  if (request_completion)
    goto out;

  /*
   * Try and disentangle the command line arguments, with the aim of supporting:
   *    gdbus wait --session --activate ActivateName WaitName
   *    gdbus wait --session --activate ActivateAndWaitName
   *    gdbus wait --activate --session ActivateAndWaitName
   *    gdbus wait --session WaitName
   */
  if (*argc == 2 && opt_wait_activate_set && opt_wait_activate_name != NULL)
    {
      activate_service = opt_wait_activate_name;
      wait_service = (*argv)[1];
    }
  else if (*argc == 2 &&
           opt_wait_activate_set && opt_wait_activate_name == NULL)
    {
      activate_service = (*argv)[1];
      wait_service = (*argv)[1];
    }
  else if (*argc == 2 && !opt_wait_activate_set)
    {
      activate_service = NULL;  /* disabled */
      wait_service = (*argv)[1];
    }
  else if (*argc == 1 &&
           opt_wait_activate_set && opt_wait_activate_name != NULL)
    {
      activate_service = opt_wait_activate_name;
      wait_service = opt_wait_activate_name;
    }
  else if (*argc == 1 &&
           opt_wait_activate_set && opt_wait_activate_name == NULL)
    {
      g_printerr (_("Error: A service to activate for must be specified.\n"));
      goto out;
    }
  else if (*argc == 1 && !opt_wait_activate_set)
    {
      g_printerr (_("Error: A service to wait for must be specified.\n"));
      goto out;
    }
  else /* if (*argc > 2) */
    {
      g_printerr (_("Error: Too many arguments.\n"));
      goto out;
    }

  if (activate_service != NULL &&
      (!g_dbus_is_name (activate_service) ||
       g_dbus_is_unique_name (activate_service)))
    {
      g_printerr (_("Error: %s is not a valid well-known bus name.\n"),
                  activate_service);
      goto out;
    }

  if (!g_dbus_is_name (wait_service) || g_dbus_is_unique_name (wait_service))
    {
      g_printerr (_("Error: %s is not a valid well-known bus name.\n"),
                  wait_service);
      goto out;
    }

  /* Start the prerequisite service if needed. */
  if (activate_service != NULL)
    {
      activate_watch_id = g_bus_watch_name_on_connection (c, activate_service,
                                                          G_BUS_NAME_WATCHER_FLAGS_AUTO_START,
                                                          NULL, NULL,
                                                          NULL, NULL);
    }
  else
    {
      activate_watch_id = 0;
    }

  /* Wait for the expected name to appear. */
  watch_id = g_bus_watch_name_on_connection (c,
                                             wait_service,
                                             G_BUS_NAME_WATCHER_FLAGS_NONE,
                                             wait_name_appeared_cb,
                                             NULL, &wait_state, NULL);

  /* Safety timeout. */
  if (opt_wait_timeout > 0)
    timer_id = g_timeout_add (opt_wait_timeout, wait_timeout_cb, &wait_state);

  while (wait_state == WAIT_STATE_RUNNING)
    g_main_context_iteration (NULL, TRUE);

  g_bus_unwatch_name (watch_id);
  if (timer_id != 0)
      g_source_remove (timer_id);
  if (activate_watch_id != 0)
      g_bus_unwatch_name (activate_watch_id);

  ret = (wait_state == WAIT_STATE_SUCCESS);

 out:
  g_clear_object (&c);
  g_option_context_free (o);
  g_free (opt_wait_activate_name);
  opt_wait_activate_name = NULL;

  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

static gchar *
pick_word_at (const gchar  *s,
              gint          cursor,
              gint         *out_word_begins_at)
{
  gint begin;
  gint end;

  if (s[0] == '\0')
    {
      if (out_word_begins_at != NULL)
        *out_word_begins_at = -1;
      return NULL;
    }

  if (g_ascii_isspace (s[cursor]) && ((cursor > 0 && g_ascii_isspace(s[cursor-1])) || cursor == 0))
    {
      if (out_word_begins_at != NULL)
        *out_word_begins_at = cursor;
      return g_strdup ("");
    }

  while (!g_ascii_isspace (s[cursor - 1]) && cursor > 0)
    cursor--;
  begin = cursor;

  end = begin;
  while (!g_ascii_isspace (s[end]) && s[end] != '\0')
    end++;

  if (out_word_begins_at != NULL)
    *out_word_begins_at = begin;

  return g_strndup (s + begin, end - begin);
}

gint
main (gint argc, gchar *argv[])
{
  gint ret;
  const gchar *command;
  gboolean request_completion;
  gchar *completion_cur;
  gchar *completion_prev;
#ifdef G_OS_WIN32
  gchar *tmp;
#endif

  setlocale (LC_ALL, "");
  textdomain (GETTEXT_PACKAGE);

#ifdef G_OS_WIN32
  tmp = _glib_get_locale_dir ();
  bindtextdomain (GETTEXT_PACKAGE, tmp);
  g_free (tmp);
#else
  bindtextdomain (GETTEXT_PACKAGE, GLIB_LOCALE_DIR);
#endif

#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#endif

  ret = 1;
  completion_cur = NULL;
  completion_prev = NULL;

  if (argc < 2)
    {
      usage (&argc, &argv, FALSE);
      goto out;
    }

  request_completion = FALSE;

  //completion_debug ("---- argc=%d --------------------------------------------------------", argc);

 again:
  command = argv[1];
  if (g_strcmp0 (command, "help") == 0)
    {
      if (request_completion)
        {
          /* do nothing */
        }
      else
        {
          usage (&argc, &argv, TRUE);
          ret = 0;
        }
      goto out;
    }
  else if (g_strcmp0 (command, "emit") == 0)
    {
      if (handle_emit (&argc,
                       &argv,
                       request_completion,
                       completion_cur,
                       completion_prev))
        ret = 0;
      goto out;
    }
  else if (g_strcmp0 (command, "call") == 0)
    {
      if (handle_call (&argc,
                       &argv,
                       request_completion,
                       completion_cur,
                       completion_prev))
        ret = 0;
      goto out;
    }
  else if (g_strcmp0 (command, "introspect") == 0)
    {
      if (handle_introspect (&argc,
                             &argv,
                             request_completion,
                             completion_cur,
                             completion_prev))
        ret = 0;
      goto out;
    }
  else if (g_strcmp0 (command, "monitor") == 0)
    {
      if (handle_monitor (&argc,
                          &argv,
                          request_completion,
                          completion_cur,
                          completion_prev))
        ret = 0;
      goto out;
    }
  else if (g_strcmp0 (command, "wait") == 0)
    {
      if (handle_wait (&argc,
                       &argv,
                       request_completion,
                       completion_cur,
                       completion_prev))
        ret = 0;
      goto out;
    }
  else if (g_strcmp0 (command, "complete") == 0 && argc == 4 && !request_completion)
    {
      const gchar *completion_line;
      gchar **completion_argv;
      gint completion_argc;
      gint completion_point;
      gchar *endp;
      gint cur_begin;

      request_completion = TRUE;

      completion_line = argv[2];
      completion_point = strtol (argv[3], &endp, 10);
      if (endp == argv[3] || *endp != '\0')
        goto out;

#if 0
      completion_debug ("completion_point=%d", completion_point);
      completion_debug ("----");
      completion_debug (" 0123456789012345678901234567890123456789012345678901234567890123456789");
      completion_debug ("'%s'", completion_line);
      completion_debug (" %*s^",
                         completion_point, "");
      completion_debug ("----");
#endif

      if (!g_shell_parse_argv (completion_line,
                               &completion_argc,
                               &completion_argv,
                               NULL))
        {
          /* it's very possible the command line can't be parsed (for
           * example, missing quotes etc) - in that case, we just
           * don't autocomplete at all
           */
          goto out;
        }

      /* compute cur and prev */
      completion_prev = NULL;
      completion_cur = pick_word_at (completion_line, completion_point, &cur_begin);
      if (cur_begin > 0)
        {
          gint prev_end;
          for (prev_end = cur_begin - 1; prev_end >= 0; prev_end--)
            {
              if (!g_ascii_isspace (completion_line[prev_end]))
                {
                  completion_prev = pick_word_at (completion_line, prev_end, NULL);
                  break;
                }
            }
        }
#if 0
      completion_debug (" cur='%s'", completion_cur);
      completion_debug ("prev='%s'", completion_prev);
#endif

      argc = completion_argc;
      argv = completion_argv;

      ret = 0;

      goto again;
    }
  else
    {
      if (request_completion)
        {
          g_print ("help \nemit \ncall \nintrospect \nmonitor \nwait \n");
          ret = 0;
          goto out;
        }
      else
        {
          g_printerr ("Unknown command '%s'\n", command);
          usage (&argc, &argv, FALSE);
          goto out;
        }
    }

 out:
  g_free (completion_cur);
  g_free (completion_prev);
  return ret;
}
