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/*
An indicator to show information that is in messaging applications
that the user is using.

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 <string.h>
#include <gtk/gtk.h>
#include <libindicate/listener.h>

#include "im-menu-item.h"
#include "app-menu-item.h"

static IndicateListener * listener;
static GList * imList;
static GHashTable * serverHash;
static GtkWidget * main_image;
static GtkWidget * main_menu;

typedef struct _imList_t imList_t;
struct _imList_t {
	IndicateListenerServer * server;
	IndicateListenerIndicator * indicator;
	GtkWidget * menuitem;
};

static gboolean
imList_equal (gconstpointer a, gconstpointer b)
{
	imList_t * pa, * pb;

	pa = (imList_t *)a;
	pb = (imList_t *)b;

	gchar * pas = INDICATE_LISTENER_SERVER_DBUS_NAME(pa->server);
	gchar * pbs = INDICATE_LISTENER_SERVER_DBUS_NAME(pb->server);

	guint pai = INDICATE_LISTENER_INDICATOR_ID(pa->indicator);
	guint pbi = INDICATE_LISTENER_INDICATOR_ID(pb->indicator);

	g_debug("\tComparing (%s %d) to (%s %d)", pas, pai, pbs, pbi);

	return !((!strcmp(pas, pbs)) && (pai == pbi));
}


void 
server_added (IndicateListener * listener, IndicateListenerServer * server, gchar * type, gpointer data)
{
	g_debug("Server Added '%s' of type '%s'.", INDICATE_LISTENER_SERVER_DBUS_NAME(server), type);
	if (type == NULL) {
		return;
	}

	if (type[0] == '\0') {
		return;
	}

	if (strncmp(type, "message", strlen("message"))) {
		g_debug("\tServer type '%s' is not a message based type.", type);
		return;
	}

	GtkMenuShell * menushell = GTK_MENU_SHELL(data);
	if (menushell == NULL) {
		g_error("\tData in callback is not a menushell");
		return;
	}

	gchar * servername = g_strdup(INDICATE_LISTENER_SERVER_DBUS_NAME(server));
	AppMenuItem * menuitem = app_menu_item_new(listener, server);

	g_hash_table_insert(serverHash, servername, menuitem);
	gtk_menu_shell_prepend(menushell, GTK_WIDGET(menuitem));
	gtk_widget_show(menuitem);
	gtk_widget_show(main_menu);

	return;
}

void 
server_removed (IndicateListener * listener, IndicateListenerServer * server, gchar * type, gpointer data)
{
	g_debug("Removing server: %s", INDICATE_LISTENER_SERVER_DBUS_NAME(server));
	gpointer lookup = g_hash_table_lookup(serverHash, INDICATE_LISTENER_SERVER_DBUS_NAME(server));

	if (lookup == NULL) {
		g_debug("\tUnable to find server: %s", INDICATE_LISTENER_SERVER_DBUS_NAME(server));
		return;
	}

	g_hash_table_remove(serverHash, INDICATE_LISTENER_SERVER_DBUS_NAME(server));

	AppMenuItem * menuitem = APP_MENU_ITEM(lookup);
	g_return_if_fail(menuitem != NULL);

	gtk_widget_hide(GTK_WIDGET(menuitem));
	gtk_container_remove(GTK_CONTAINER(data), GTK_WIDGET(menuitem));

	if (g_list_length(g_hash_table_get_keys(serverHash)) == 0 && g_list_length(imList) == 0) {
		gtk_widget_hide(main_menu);
	}

	return;
}

static void
subtype_cb (IndicateListener * listener, IndicateListenerServer * server, IndicateListenerIndicator * indicator, gchar * property, gchar * propertydata, gpointer data)
{
	GtkMenuShell * menushell = GTK_MENU_SHELL(data);
	if (menushell == NULL) {
		g_error("Data in callback is not a menushell");
		return;
	}

	if (property == NULL || strcmp(property, "subtype")) {
		/* We should only ever get subtypes, but just in case */
		g_warning("Subtype callback got a property '%s'", property);
		return;
	}

	if (propertydata == NULL || propertydata[0] == '\0') {
		/* It's possible that this message didn't have a subtype.  That's
		 * okay, but we don't want to display those */
		g_debug("No subtype");
		return;
	}

	g_debug("Message subtype: %s", propertydata);

	if (!strcmp(propertydata, "im")) {
		imList_t * listItem = g_new(imList_t, 1);
		listItem->server = server;
		listItem->indicator = indicator;

		g_debug("Building IM Item");
		ImMenuItem * menuitem = im_menu_item_new(listener, server, indicator);
		g_object_ref(G_OBJECT(menuitem));
		listItem->menuitem = GTK_WIDGET(menuitem);

		g_debug("Adding to IM Hash");
		imList = g_list_append(imList, listItem);

		g_debug("Placing in Shell");
		gtk_menu_shell_prepend(menushell, GTK_WIDGET(menuitem));
	}

	if (g_list_length(imList) != 0) {
		g_debug("Setting image to 'new'");
		gtk_image_set_from_icon_name(main_image, "indicator-messages-new", GTK_ICON_SIZE_MENU);
	} else {
		g_debug("Hmm, still no entries");
	}

	return;
}

static void
indicator_added (IndicateListener * listener, IndicateListenerServer * server, IndicateListenerIndicator * indicator, gchar * type, gpointer data)
{
	if (type == NULL || strcmp(type, "message")) {
		/* We only care about message type indicators
		   all of the others can go to the bit bucket */
		g_debug("Ignoreing indicator of type '%s'", type);
		return;
	}
	g_debug("Got a message");

	indicate_listener_get_property(listener, server, indicator, "subtype", subtype_cb, data);	
	return;
}

static void
indicator_removed (IndicateListener * listener, IndicateListenerServer * server, IndicateListenerIndicator * indicator, gchar * type, gpointer data)
{
	g_debug("Removing %s %d", (gchar*)server, (guint)indicator);
	if (type == NULL || strcmp(type, "message")) {
		/* We only care about message type indicators
		   all of the others can go to the bit bucket */
		g_debug("Ignoreing indicator of type '%s'", type);
		return;
	}

	gboolean removed = FALSE;

	/* Look in the IM Hash Table */
	imList_t listData;
	listData.server = server;
	listData.indicator = indicator;

	GList * listItem = g_list_find_custom(imList, &listData, imList_equal);
	GtkWidget * menuitem = NULL;
	if (listItem != NULL) {
		menuitem = ((imList_t *)listItem->data)->menuitem;
	}

	if (!removed && menuitem != NULL) {
		g_object_ref(menuitem);
		imList = g_list_remove(imList, listItem->data);

		gtk_widget_hide(menuitem);
		gtk_container_remove(GTK_CONTAINER(data), menuitem);

		g_object_unref(menuitem);
		removed = TRUE;
	}

	if (!removed) {
		g_warning("We were asked to remove %s %d but we didn't.", (gchar*)server, (guint)indicator);
	}

	if (g_list_length(imList) == 0) {
		gtk_image_set_from_icon_name(main_image, "indicator-messages", GTK_ICON_SIZE_MENU);
		if (g_list_length(g_hash_table_get_keys(serverHash)) == 0) {
			gtk_widget_hide(main_menu);
		}
	}

	return;
}

GtkWidget *
get_menu_item (void)
{
	listener = indicate_listener_new();
	imList = NULL;

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

	main_menu = gtk_menu_item_new();

	main_image = gtk_image_new_from_icon_name("indicator-messages", GTK_ICON_SIZE_MENU);
	gtk_widget_show(main_image);
	gtk_container_add(GTK_CONTAINER(main_menu), main_image);

	GtkWidget * submenu = gtk_menu_new();
	gtk_menu_item_set_submenu(GTK_MENU_ITEM(main_menu), submenu);
	gtk_widget_show(submenu);

	g_signal_connect(listener, INDICATE_LISTENER_SIGNAL_INDICATOR_ADDED, G_CALLBACK(indicator_added), submenu);
	g_signal_connect(listener, INDICATE_LISTENER_SIGNAL_INDICATOR_REMOVED, G_CALLBACK(indicator_removed), submenu);
	g_signal_connect(listener, INDICATE_LISTENER_SIGNAL_SERVER_ADDED, G_CALLBACK(server_added), submenu);
	g_signal_connect(listener, INDICATE_LISTENER_SIGNAL_SERVER_REMOVED, G_CALLBACK(server_removed), submenu);

	return main_menu;
}