/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2005-2007 Richard Hughes <richard@hughsie.com>
 *
 * Taken in part from:
 *  - lshal   (C) 2003 David Zeuthen, <david@fubar.dk>
 *  - notibat (C) 2004 Benjamin Kahn, <xkahn@zoned.net>
 *
 * Licensed under the GNU General Public License Version 2
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <locale.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <gtk/gtk.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>

#include "gpm-stock-icons.h"
#include "gpm-common.h"
#include "gpm-manager.h"
#include "gpm-session.h"

#include "org.gnome.PowerManager.h"

#include "egg-debug.h"

/**
 * gpm_object_register:
 * @connection: What we want to register to
 * @object: The GObject we want to register
 *
 * Register org.gnome.PowerManager on the session bus.
 * This function MUST be called before DBUS service will work.
 *
 * Return value: success
 **/
static gboolean
gpm_object_register (DBusGConnection *connection,
		     GObject	     *object)
{
	DBusGProxy *bus_proxy = NULL;
	GError *error = NULL;
	guint request_name_result;
	gboolean ret;

	bus_proxy = dbus_g_proxy_new_for_name (connection,
					       DBUS_SERVICE_DBUS,
					       DBUS_PATH_DBUS,
					       DBUS_INTERFACE_DBUS);

	ret = dbus_g_proxy_call (bus_proxy, "RequestName", &error,
				 G_TYPE_STRING, GPM_DBUS_SERVICE,
				 G_TYPE_UINT, 0,
				 G_TYPE_INVALID,
				 G_TYPE_UINT, &request_name_result,
				 G_TYPE_INVALID);
	if (error) {
		egg_debug ("ERROR: %s", error->message);
		g_error_free (error);
	}
	if (!ret) {
		/* abort as the DBUS method failed */
		egg_warning ("RequestName failed!");
		return FALSE;
	}

	/* free the bus_proxy */
	g_object_unref (G_OBJECT (bus_proxy));

	/* already running */
 	if (request_name_result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
		return FALSE;
	}

	dbus_g_object_type_install_info (GPM_TYPE_MANAGER, &dbus_glib_gpm_manager_object_info);
	dbus_g_error_domain_register (GPM_MANAGER_ERROR, NULL, GPM_MANAGER_TYPE_ERROR);
	dbus_g_connection_register_g_object (connection, GPM_DBUS_PATH, object);

	return TRUE;
}

/**
 * timed_exit_cb:
 * @loop: The main loop
 *
 * Exits the main loop, which is helpful for valgrinding g-p-m.
 *
 * Return value: FALSE, as we don't want to repeat this action.
 **/
static gboolean
timed_exit_cb (GMainLoop *loop)
{
	g_main_loop_quit (loop);
	return FALSE;
}

/**
 * gpm_main_stop_cb:
 **/
static void
gpm_main_stop_cb (GpmSession *session, GMainLoop *loop)
{
	g_main_loop_quit (loop);
}

/**
 * gpm_main_query_end_session_cb:
 **/
static void
gpm_main_query_end_session_cb (GpmSession *session, guint flags, GMainLoop *loop)
{
	/* just send response */
	gpm_session_end_session_response (session, TRUE, NULL);
}

/**
 * gpm_main_end_session_cb:
 **/
static void
gpm_main_end_session_cb (GpmSession *session, guint flags, GMainLoop *loop)
{
	/* send response */
	gpm_session_end_session_response (session, TRUE, NULL);

	/* exit loop, will unref manager */
	g_main_loop_quit (loop);
}

/**
 * main:
 **/
int
main (int argc, char *argv[])
{
	GMainLoop *loop;
	DBusGConnection *system_connection;
	DBusGConnection *session_connection;
	gboolean verbose = FALSE;
	gboolean version = FALSE;
	gboolean timed_exit = FALSE;
	gboolean immediate_exit = FALSE;
	GpmSession *session = NULL;
	GpmManager *manager = NULL;
	GError *error = NULL;
	GOptionContext *context;
	gint ret;
	guint timer_id;

	const GOptionEntry options[] = {
		{ "verbose", '\0', 0, G_OPTION_ARG_NONE, &verbose,
		  N_("Show extra debugging information"), NULL },
		{ "version", '\0', 0, G_OPTION_ARG_NONE, &version,
		  N_("Show version of installed program and exit"), NULL },
		{ "timed-exit", '\0', 0, G_OPTION_ARG_NONE, &timed_exit,
		  N_("Exit after a small delay (for debugging)"), NULL },
		{ "immediate-exit", '\0', 0, G_OPTION_ARG_NONE, &immediate_exit,
		  N_("Exit after the manager has loaded (for debugging)"), NULL },
		{ NULL}
	};

	setlocale (LC_ALL, "");
	bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);
	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
	textdomain (GETTEXT_PACKAGE);

	if (! g_thread_supported ())
		g_thread_init (NULL);
	dbus_g_thread_init ();
	g_type_init ();

	context = g_option_context_new (N_("GNOME Power Manager"));
	/* TRANSLATORS: program name, a simple app to view pending updates */
	g_option_context_add_main_entries (context, options, GETTEXT_PACKAGE);
	g_option_context_set_translation_domain(context, GETTEXT_PACKAGE);
	g_option_context_set_summary (context, _("GNOME Power Manager"));
	g_option_context_parse (context, &argc, &argv, NULL);

	if (version) {
		g_print ("Version %s\n", VERSION);
		goto unref_program;
	}

	if (!g_thread_supported ())
		g_thread_init (NULL);
	dbus_g_thread_init ();

	gtk_init (&argc, &argv);
	egg_debug_init (verbose);

	egg_debug ("GNOME %s %s", GPM_NAME, VERSION);

	/* check dbus connections, exit if not valid */
	system_connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
	if (error) {
		egg_warning ("%s", error->message);
		g_error_free (error);
		egg_error ("This program cannot start until you start "
			   "the dbus system service.\n"
			   "It is <b>strongly recommended</b> you reboot "
			   "your computer after starting this service.");
	}

	session_connection = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
	if (error) {
		egg_warning ("%s", error->message);
		g_error_free (error);
		egg_error ("This program cannot start until you start the "
			   "dbus session service.\n\n"
			   "This is usually started automatically in X "
			   "or gnome startup when you start a new session.");
	}

	/* add application specific icons to search path */
	gtk_icon_theme_append_search_path (gtk_icon_theme_get_default (),
                                           GPM_DATA G_DIR_SEPARATOR_S "icons");

	loop = g_main_loop_new (NULL, FALSE);

	/* optionally register with the session */
	session = gpm_session_new ();
	g_signal_connect (session, "stop", G_CALLBACK (gpm_main_stop_cb), loop);
	g_signal_connect (session, "query-end-session", G_CALLBACK (gpm_main_query_end_session_cb), loop);
	g_signal_connect (session, "end-session", G_CALLBACK (gpm_main_end_session_cb), loop);
	gpm_session_register_client (session, "gnome-power-manager", getenv ("DESKTOP_AUTOSTART_ID"));

	/* create a new gui object */
	manager = gpm_manager_new ();

	if (!gpm_object_register (session_connection, G_OBJECT (manager))) {
		egg_error ("%s is already running in this session.", GPM_NAME);
		return 0;
	}

	/* register to be a policy agent, just like kpackagekit does */
	ret = dbus_bus_request_name(dbus_g_connection_get_connection(system_connection),
				    "org.freedesktop.Policy.Power",
				    DBUS_NAME_FLAG_REPLACE_EXISTING, NULL);
	switch (ret) {
	case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
		egg_debug ("Successfully acquired interface org.freedesktop.Policy.Power.");
		break;
	case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
		egg_debug ("Queued for interface org.freedesktop.Policy.Power.");
		break;
	default:
		break;
	};

	/* Only timeout and close the mainloop if we have specified it
	 * on the command line */
	if (timed_exit) {
		timer_id = g_timeout_add_seconds (20, (GSourceFunc) timed_exit_cb, loop);
#if GLIB_CHECK_VERSION(2,25,8)
		g_source_set_name_by_id (timer_id, "[GpmMain] timed-exit");
#endif
	}

	if (immediate_exit == FALSE) {
		g_main_loop_run (loop);
	}

	g_main_loop_unref (loop);

	g_object_unref (session);
	g_object_unref (manager);
unref_program:
	g_option_context_free (context);
	return 0;
}
