/*
A small wrapper utility to load indicators and put them as menu items
into the gnome-panel using it's applet interface.

Copyright 2009 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>

This program is free software: you can redistribute it and/or modify it 
under the terms of the GNU General Public License version 3, as published 
by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranties of 
MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
*/


#include <gtk/gtk.h>
#include <libdbusmenu-gtk/client.h>

#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-bindings.h>

#include <libindicator/indicator.h>
INDICATOR_SET_VERSION
INDICATOR_SET_NAME("users-status-session")

#include "dbus-shared-names.h"
#include "status-service-client.h"

static DbusmenuGtkClient * status_client = NULL;
static DbusmenuGtkClient * users_client = NULL;
static DbusmenuGtkClient * session_client = NULL;

static GtkMenu * main_menu = NULL;

static GtkWidget * status_separator = NULL;
static GtkWidget * users_separator = NULL;
#define SEPARATOR_SHOWN(sep) (sep != NULL && GTK_WIDGET_VISIBLE(sep))
static GtkWidget * loading_item = NULL;

static DBusGConnection * connection = NULL;
static DBusGProxy * proxy = NULL;

typedef enum {
	STATUS_SECTION,
	USERS_SECTION,
	SESSION_SECTION,
	END_OF_SECTIONS
} section_t;

static void child_added (DbusmenuMenuitem * parent, DbusmenuMenuitem * child, guint position, gpointer section);
static guint status_menu_pos_offset (void);
static guint users_menu_pos_offset (void);
static guint session_menu_pos_offset (void);

GtkLabel *
get_label (void)
{
	GtkLabel * returnval = GTK_LABEL(gtk_label_new(g_get_user_name()));
	gtk_widget_show(GTK_WIDGET(returnval));
	return returnval;
}

GtkImage *
get_icon (void)
{
	GtkImage * image = GTK_IMAGE(gtk_image_new_from_icon_name("user-offline", GTK_ICON_SIZE_MENU));
	return image;
}

static void
child_added (DbusmenuMenuitem * parent, DbusmenuMenuitem * child, guint position, gpointer section)
{
	DbusmenuGtkClient * client = NULL;
	gchar * errorstr = NULL;
	guint (*posfunc) (void) = NULL;

	switch (GPOINTER_TO_UINT(section)) {
		case STATUS_SECTION:
			client = status_client;
			errorstr = "Status";
			posfunc = status_menu_pos_offset;
			break;
		case USERS_SECTION:
			client = users_client;
			errorstr = "Users";
			posfunc = users_menu_pos_offset;
			break;
		case SESSION_SECTION:
			client = session_client;
			errorstr = "Session";
			posfunc = session_menu_pos_offset;
			break;
		default:
			g_warning("Child Added called with an unknown position function!");
			return;
	}

	position += posfunc();
	g_debug("SUS: Adding child: %d", position);
	GtkMenuItem * widget = dbusmenu_gtkclient_menuitem_get(client, child);

	if (widget == NULL) {
		g_warning("Had a menu item added to the %s menu, but yet it didn't have a GtkWidget with it.  Can't add that to a menu now can we?  You need to figure this @#$# out!", errorstr);
		return;
	}

	gtk_menu_insert(main_menu, GTK_WIDGET(widget), position);
	gtk_widget_show(GTK_WIDGET(widget));

	gtk_widget_hide(loading_item);

	return;
}

static void
child_moved (DbusmenuMenuitem * parent, DbusmenuMenuitem * child, guint newpos, guint oldpos, guint (*posfunc) (void))
{


}


/* Status Menu */
static guint
status_menu_pos_offset (void)
{
	return 0;
}

static void
status_menu_added (DbusmenuMenuitem * root, DbusmenuMenuitem * child, guint position, gpointer user_data)
{
	gtk_widget_show(GTK_WIDGET(status_separator));
	return;
}

static void
status_menu_removed (DbusmenuMenuitem * root, DbusmenuMenuitem * child, gpointer user_data)
{
	if (g_list_length(dbusmenu_menuitem_get_children(root)) == 0) {
		gtk_widget_hide(GTK_WIDGET(status_separator));
	}

	return;
}

static void
status_menu_root_changed(DbusmenuGtkClient * client, DbusmenuMenuitem * newroot, GtkMenu * main)
{
	if (newroot == NULL) {
		gtk_widget_hide(GTK_WIDGET(status_separator));
		return;
	}

	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_ADDED,   G_CALLBACK(child_added),           GUINT_TO_POINTER(STATUS_SECTION));
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED, G_CALLBACK(status_menu_added),     NULL);
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED, G_CALLBACK(status_menu_removed),   NULL);
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_MOVED,   G_CALLBACK(child_moved),           GUINT_TO_POINTER(STATUS_SECTION));

	GList * child = NULL;
	guint count = 0;
	for (child = dbusmenu_menuitem_get_children(newroot); child != NULL; child = g_list_next(child), count++) {
		child_added(newroot, DBUSMENU_MENUITEM(child->data), count, GUINT_TO_POINTER(STATUS_SECTION));
	}

	if (count > 0) {
		gtk_widget_show(GTK_WIDGET(status_separator));
	}

	return;
}

static gboolean
build_status_menu (gpointer userdata)
{
	g_debug("Building Status Menu");
	guint returnval = 0;
	GError * error = NULL;

	if (proxy == NULL) {
		/* If we don't have DBus, let's stay in the idle loop */
		return TRUE;
	}

	if (!org_freedesktop_DBus_start_service_by_name (proxy, INDICATOR_STATUS_DBUS_NAME, 0, &returnval, &error)) {
		g_error("Unable to send message to DBus to start service: %s", error != NULL ? error->message : "(NULL error)" );
		g_error_free(error);
		return FALSE;
	}

	if (returnval != DBUS_START_REPLY_SUCCESS && returnval != DBUS_START_REPLY_ALREADY_RUNNING) {
		g_error("Return value isn't indicative of success: %d", returnval);
		return FALSE;
	}

	status_client = dbusmenu_gtkclient_new(INDICATOR_STATUS_DBUS_NAME, INDICATOR_STATUS_DBUS_OBJECT);
	g_signal_connect(G_OBJECT(status_client), DBUSMENU_GTKCLIENT_SIGNAL_ROOT_CHANGED, G_CALLBACK(status_menu_root_changed), main_menu);

	status_separator = gtk_separator_menu_item_new();
	gtk_menu_shell_append(GTK_MENU_SHELL(main_menu), status_separator);
	gtk_widget_hide(status_separator); /* Should be default, I'm just being explicit.  $(%*#$ hide already!  */

	return FALSE;
}

/* Users menu */

static guint
users_menu_pos_offset (void)
{
	guint position = 0;
	if (SEPARATOR_SHOWN(status_separator)) {
		GList * location = g_list_find(GTK_MENU_SHELL(main_menu)->children, status_separator);
		position = g_list_position(GTK_MENU_SHELL(main_menu)->children, location) + 1;
	}

	return position;
}

static void
users_menu_added (DbusmenuMenuitem * root, DbusmenuMenuitem * child, guint position, gpointer user_data)
{
	gtk_widget_show(GTK_WIDGET(users_separator));
	return;
}

static void
users_menu_removed (DbusmenuMenuitem * root, DbusmenuMenuitem * child, gpointer user_data)
{
	if (g_list_length(dbusmenu_menuitem_get_children(root)) == 0) {
		gtk_widget_hide(GTK_WIDGET(users_separator));
	}

	return;
}

static void
users_menu_root_changed(DbusmenuGtkClient * client, DbusmenuMenuitem * newroot, GtkMenu * main)
{
	if (newroot == NULL) {
		gtk_widget_hide(GTK_WIDGET(users_separator));
		return;
	}

	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_ADDED,   G_CALLBACK(child_added),           GUINT_TO_POINTER(USERS_SECTION));
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED, G_CALLBACK(users_menu_added),      NULL);
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED, G_CALLBACK(users_menu_removed),    NULL);
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_MOVED,   G_CALLBACK(child_moved),           GUINT_TO_POINTER(USERS_SECTION));

	GList * child = NULL;
	guint count = 0;
	for (child = dbusmenu_menuitem_get_children(newroot); child != NULL; child = g_list_next(child), count++) {
		child_added(newroot, DBUSMENU_MENUITEM(child->data), count, GUINT_TO_POINTER(USERS_SECTION));
	}

	if (count > 0) {
		gtk_widget_show(GTK_WIDGET(users_separator));
	}

	return;
}

static gboolean
build_users_menu (gpointer userdata)
{
	g_debug("Building Users Menu");
	guint returnval = 0;
	GError * error = NULL;

	if (proxy == NULL) {
		/* If we don't have DBus, let's stay in the idle loop */
		return TRUE;
	}

	if (!org_freedesktop_DBus_start_service_by_name (proxy, INDICATOR_USERS_DBUS_NAME, 0, &returnval, &error)) {
		g_error("Unable to send message to DBus to start service: %s", error != NULL ? error->message : "(NULL error)" );
		g_error_free(error);
		return FALSE;
	}

	if (returnval != DBUS_START_REPLY_SUCCESS && returnval != DBUS_START_REPLY_ALREADY_RUNNING) {
		g_error("Return value isn't indicative of success: %d", returnval);
		return FALSE;
	}

	users_client = dbusmenu_gtkclient_new(INDICATOR_USERS_DBUS_NAME, INDICATOR_USERS_DBUS_OBJECT);
	g_signal_connect(G_OBJECT(users_client), DBUSMENU_GTKCLIENT_SIGNAL_ROOT_CHANGED, G_CALLBACK(users_menu_root_changed), main_menu);

	users_separator = gtk_separator_menu_item_new();
	gtk_menu_shell_append(GTK_MENU_SHELL(main_menu), users_separator);
	gtk_widget_hide(users_separator); /* Should be default, I'm just being explicit.  $(%*#$ hide already!  */

	return FALSE;
}

/* Session Menu Stuff */

static guint
session_menu_pos_offset (void)
{
	guint position = 0;
	if (SEPARATOR_SHOWN(users_separator)) {
		GList * location = g_list_find(GTK_MENU_SHELL(main_menu)->children, users_separator);
		position = g_list_position(GTK_MENU_SHELL(main_menu)->children, location) + 1;
	} else if (SEPARATOR_SHOWN(status_separator)) {
		GList * location = g_list_find(GTK_MENU_SHELL(main_menu)->children, status_separator);
		position = g_list_position(GTK_MENU_SHELL(main_menu)->children, location) + 1;
	}

	return position;
}

static void
session_menu_removed (DbusmenuMenuitem * root, DbusmenuMenuitem * child, gpointer user_data)
{
	return;
}

static void
session_menu_root_changed(DbusmenuGtkClient * client, DbusmenuMenuitem * newroot, GtkMenu * main)
{
	if (newroot == NULL) {
		/* We're assuming this'll crash the least so it doesn't
		   hide a separator.  May be a bad choice. */
		return;
	}

	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_ADDED,   G_CALLBACK(child_added),           GUINT_TO_POINTER(SESSION_SECTION));
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED, G_CALLBACK(session_menu_removed),  NULL);
	g_signal_connect(G_OBJECT(newroot), DBUSMENU_MENUITEM_SIGNAL_CHILD_MOVED,   G_CALLBACK(child_moved),           GUINT_TO_POINTER(SESSION_SECTION));

	GList * child = NULL;
	guint count = 0;
	for (child = dbusmenu_menuitem_get_children(newroot); child != NULL; child = g_list_next(child), count++) {
		child_added(newroot, DBUSMENU_MENUITEM(child->data), count, GUINT_TO_POINTER(SESSION_SECTION));
	}

	return;
}

static gboolean
build_session_menu (gpointer userdata)
{
	g_debug("Building Session Menu");
	guint returnval = 0;
	GError * error = NULL;

	if (proxy == NULL) {
		/* If we don't have DBus, let's stay in the idle loop */
		return TRUE;
	}

	if (!org_freedesktop_DBus_start_service_by_name (proxy, INDICATOR_SESSION_DBUS_NAME, 0, &returnval, &error)) {
		g_error("Unable to send message to DBus to start service: %s", error != NULL ? error->message : "(NULL error)" );
		g_error_free(error);
		return FALSE;
	}

	if (returnval != DBUS_START_REPLY_SUCCESS && returnval != DBUS_START_REPLY_ALREADY_RUNNING) {
		g_error("Return value isn't indicative of success: %d", returnval);
		return FALSE;
	}

	session_client = dbusmenu_gtkclient_new(INDICATOR_SESSION_DBUS_NAME, INDICATOR_SESSION_DBUS_OBJECT);
	g_signal_connect(G_OBJECT(session_client), DBUSMENU_GTKCLIENT_SIGNAL_ROOT_CHANGED, G_CALLBACK(session_menu_root_changed), main_menu);

	return FALSE;
}

/* Base menu stuff */

GtkMenu *
get_menu (void)
{
	connection = dbus_g_bus_get(DBUS_BUS_SESSION, NULL);
	proxy = dbus_g_proxy_new_for_name(connection, DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS);
	if (proxy == NULL) {
		g_warning("Unable to get proxy for DBus itself.  Seriously.");
	}

	g_idle_add(build_status_menu, NULL);
	g_idle_add(build_users_menu, NULL);
	g_idle_add(build_session_menu, NULL);

	main_menu = GTK_MENU(gtk_menu_new());
	loading_item = gtk_menu_item_new_with_label("Loading...");
	gtk_menu_shell_append(GTK_MENU_SHELL(main_menu), loading_item);
	gtk_widget_show(GTK_WIDGET(loading_item));

	return main_menu;
}