/*
An object that stores the registration of all the application
indicators.  It also communicates this to the indicator visualization.

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/>.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <dbus/dbus-glib.h>
#include "application-service-appstore.h"
#include "application-service-marshal.h"
#include "dbus-properties-client.h"
#include "dbus-shared.h"

/* DBus Prototypes */
static gboolean _application_service_server_get_applications (ApplicationServiceAppstore * appstore, GArray ** apps);

#include "application-service-server.h"

#define NOTIFICATION_ITEM_PROP_ID         "Id"
#define NOTIFICATION_ITEM_PROP_CATEGORY   "Category"
#define NOTIFICATION_ITEM_PROP_STATUS     "Status"
#define NOTIFICATION_ITEM_PROP_ICON_NAME  "IconName"
#define NOTIFICATION_ITEM_PROP_AICON_NAME "AttentionIconName"
#define NOTIFICATION_ITEM_PROP_MENU       "Menu"

/* Private Stuff */
typedef struct _ApplicationServiceAppstorePrivate ApplicationServiceAppstorePrivate;
struct _ApplicationServiceAppstorePrivate {
	DBusGConnection * bus;
	GList * applications;
};

typedef struct _Application Application;
struct _Application {
	gchar * dbus_name;
	gchar * dbus_object;
	ApplicationServiceAppstore * appstore; /* not ref'd */
	DBusGProxy * dbus_proxy;
	DBusGProxy * prop_proxy;
};

#define APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(o) \
			(G_TYPE_INSTANCE_GET_PRIVATE ((o), APPLICATION_SERVICE_APPSTORE_TYPE, ApplicationServiceAppstorePrivate))

/* Signals Stuff */
enum {
	APPLICATION_ADDED,
	APPLICATION_REMOVED,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

/* GObject stuff */
static void application_service_appstore_class_init (ApplicationServiceAppstoreClass *klass);
static void application_service_appstore_init       (ApplicationServiceAppstore *self);
static void application_service_appstore_dispose    (GObject *object);
static void application_service_appstore_finalize   (GObject *object);

G_DEFINE_TYPE (ApplicationServiceAppstore, application_service_appstore, G_TYPE_OBJECT);

static void
application_service_appstore_class_init (ApplicationServiceAppstoreClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (ApplicationServiceAppstorePrivate));

	object_class->dispose = application_service_appstore_dispose;
	object_class->finalize = application_service_appstore_finalize;

	signals[APPLICATION_ADDED] = g_signal_new ("application-added",
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET (ApplicationServiceAppstore, application_added),
	                                           NULL, NULL,
	                                           _application_service_marshal_VOID__STRING_INT_STRING_STRING,
	                                           G_TYPE_NONE, 4, G_TYPE_STRING, G_TYPE_INT, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_NONE);
	signals[APPLICATION_REMOVED] = g_signal_new ("application-removed",
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET (ApplicationServiceAppstore, application_removed),
	                                           NULL, NULL,
	                                           g_cclosure_marshal_VOID__INT,
	                                           G_TYPE_NONE, 1, G_TYPE_INT, G_TYPE_NONE);


	dbus_g_object_type_install_info(APPLICATION_SERVICE_APPSTORE_TYPE,
	                                &dbus_glib__application_service_server_object_info);

	return;
}

static void
application_service_appstore_init (ApplicationServiceAppstore *self)
{
	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(self);

	priv->applications = NULL;
	
	GError * error = NULL;
	priv->bus = dbus_g_bus_get(DBUS_BUS_STARTER, &error);
	if (error != NULL) {
		g_error("Unable to get session bus: %s", error->message);
		g_error_free(error);
		return;
	}

	dbus_g_connection_register_g_object(priv->bus,
	                                    INDICATOR_APPLICATION_DBUS_OBJ,
	                                    G_OBJECT(self));

	return;
}

static void
application_service_appstore_dispose (GObject *object)
{
	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(object);

	while (priv->applications != NULL) {
		application_service_appstore_application_remove(APPLICATION_SERVICE_APPSTORE(object),
		                                           ((Application *)priv->applications->data)->dbus_name,
		                                           ((Application *)priv->applications->data)->dbus_object);
	}

	G_OBJECT_CLASS (application_service_appstore_parent_class)->dispose (object);
	return;
}

static void
application_service_appstore_finalize (GObject *object)
{

	G_OBJECT_CLASS (application_service_appstore_parent_class)->finalize (object);
	return;
}

static void
get_all_properties_cb (DBusGProxy * proxy, GHashTable * properties, GError * error, gpointer data)
{
	if (error != NULL) {
		g_warning("Unable to get properties: %s", error->message);
		return;
	}

	Application * app = (Application *)data;

	if (g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_MENU) == NULL ||
			g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ICON_NAME) == NULL) {
		g_warning("Notification Item on object %s of %s doesn't have enough properties.", app->dbus_object, app->dbus_name);
		g_free(app); // Need to do more than this, but it gives the idea of the flow we're going for.
		return;
	}

	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(app->appstore);
	priv->applications = g_list_prepend(priv->applications, app);
	
	/* TODO: We need to have the position determined better.  This
	   would involve looking at the name and category and sorting
	   it with the other entries. */

	g_signal_emit(G_OBJECT(app->appstore),
	              signals[APPLICATION_ADDED], 0, 
	              g_value_get_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ICON_NAME)),
	              0, /* Position */
	              app->dbus_name,
	              g_value_get_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_MENU)),
	              TRUE);

	return;
}

/* A simple global function for dealing with freeing the information
   in an Application structure */
static void
application_free (Application * app)
{
	if (app == NULL) return;

	if (app->dbus_name != NULL) {
		g_free(app->dbus_name);
	}
	if (app->dbus_object != NULL) {
		g_free(app->dbus_object);
	}

	g_free(app);
	return;
}

/* Gets called when the proxy is destroyed, which is usually when it
   drops off of the bus. */
static void
application_removed_cb (DBusGProxy * proxy, gpointer userdata)
{
	Application * app = (Application *)userdata;
	ApplicationServiceAppstore * appstore = app->appstore;
	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(appstore);

	GList * applistitem = g_list_find(priv->applications, app);
	if (applistitem == NULL) {
		g_warning("Removing an application that isn't in the application list?");
		return;
	}

	gint position = g_list_position(priv->applications, applistitem);

	g_signal_emit(G_OBJECT(appstore),
	              signals[APPLICATION_REMOVED], 0, 
	              position, TRUE);

	priv->applications = g_list_remove(priv->applications, app);

	application_free(app);
	return;
}

/* Adding a new NotificationItem object from DBus in to the
   appstore.  First, we need to get the information on it
   though. */
void
application_service_appstore_application_add (ApplicationServiceAppstore * appstore, const gchar * dbus_name, const gchar * dbus_object)
{
	g_debug("Adding new application: %s:%s", dbus_name, dbus_object);

	/* Make sure we got a sensible request */
	g_return_if_fail(IS_APPLICATION_SERVICE_APPSTORE(appstore));
	g_return_if_fail(dbus_name != NULL && dbus_name[0] != '\0');
	g_return_if_fail(dbus_object != NULL && dbus_object[0] != '\0');
	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(appstore);

	/* Build the application entry.  This will be carried
	   along until we're sure we've got everything. */
	Application * app = g_new(Application, 1);

	app->dbus_name = g_strdup(dbus_name);
	app->dbus_object = g_strdup(dbus_object);
	app->appstore = appstore;

	/* Get the DBus proxy for the NotificationItem interface */
	GError * error = NULL;
	app->dbus_proxy = dbus_g_proxy_new_for_name_owner(priv->bus,
	                                                  app->dbus_name,
	                                                  app->dbus_object,
	                                                  NOTIFICATION_ITEM_DBUS_IFACE,
	                                                  &error);

	if (error != NULL) {
		g_warning("Unable to get notification item proxy for object '%s' on host '%s': %s", dbus_object, dbus_name, error->message);
		g_error_free(error);
		g_free(app);
		return;
	}
	
	/* We've got it, let's watch it for destruction */
	g_signal_connect(G_OBJECT(app->dbus_proxy), "destroy", G_CALLBACK(application_removed_cb), app);

	/* Grab the property proxy interface */
	app->prop_proxy = dbus_g_proxy_new_for_name_owner(priv->bus,
	                                                  app->dbus_name,
	                                                  app->dbus_object,
	                                                  DBUS_INTERFACE_PROPERTIES,
	                                                  &error);

	if (error != NULL) {
		g_warning("Unable to get property proxy for object '%s' on host '%s': %s", dbus_object, dbus_name, error->message);
		g_error_free(error);
		g_object_unref(app->dbus_proxy);
		g_free(app);
		return;
	}

	/* Get all the propertiees */
	org_freedesktop_DBus_Properties_get_all_async(app->prop_proxy,
	                                              NOTIFICATION_ITEM_DBUS_IFACE,
	                                              get_all_properties_cb,
	                                              app);

	/* We're returning, nothing is yet added until the properties
	   come back and give us more info. */
	return;
}

void
application_service_appstore_application_remove (ApplicationServiceAppstore * appstore, const gchar * dbus_name, const gchar * dbus_object)
{
	g_return_if_fail(IS_APPLICATION_SERVICE_APPSTORE(appstore));
	g_return_if_fail(dbus_name != NULL && dbus_name[0] != '\0');
	g_return_if_fail(dbus_object != NULL && dbus_object[0] != '\0');


	return;
}

/* DBus Interface */
static gboolean
_application_service_server_get_applications (ApplicationServiceAppstore * appstore, GArray ** apps)
{

	return FALSE;
}