/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2011 Red Hat, Inc.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#include "config.h"

#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <locale.h>

#include <glib.h>
#include <glib/gi18n.h>

#include <cups/cups.h>
#include <libnotify/notify.h>

#include "gnome-settings-profile.h"
#include "gsd-print-notifications-manager.h"

#define GSD_PRINT_NOTIFICATIONS_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GSD_TYPE_PRINT_NOTIFICATIONS_MANAGER, GsdPrintNotificationsManagerPrivate))

#define CUPS_DBUS_NAME      "org.cups.cupsd.Notifier"
#define CUPS_DBUS_PATH      "/org/cups/cupsd/Notifier"
#define CUPS_DBUS_INTERFACE "org.cups.cupsd.Notifier"

#define RENEW_INTERVAL        3500
#define SUBSCRIPTION_DURATION 3600

struct GsdPrintNotificationsManagerPrivate
{
        GDBusProxy                   *cups_proxy;
        GDBusConnection              *cups_bus_connection;
        gint                          subscription_id;
        cups_dest_t                  *dests;
        gint                          num_dests;
        gboolean                      scp_handler_spawned;
        GPid                          scp_handler_pid;
};

enum {
        PROP_0,
};

static void     gsd_print_notifications_manager_class_init  (GsdPrintNotificationsManagerClass *klass);
static void     gsd_print_notifications_manager_init        (GsdPrintNotificationsManager      *print_notifications_manager);
static void     gsd_print_notifications_manager_finalize    (GObject                           *object);

G_DEFINE_TYPE (GsdPrintNotificationsManager, gsd_print_notifications_manager, G_TYPE_OBJECT)

static gpointer manager_object = NULL;

static char *
get_dest_attr (const char *dest_name,
               const char *attr,
               cups_dest_t *dests,
               int          num_dests)
{
        cups_dest_t *dest;
        const char  *value;
        char        *ret;

        if (dest_name == NULL)
                return NULL;

        ret = NULL;

        dest = cupsGetDest (dest_name, NULL, num_dests, dests);
        if (dest == NULL) {
                g_debug ("Unable to find a printer named '%s'", dest_name);
                goto out;
        }

        value = cupsGetOption (attr, dest->num_options, dest->options);
        if (value == NULL) {
                g_debug ("Unable to get %s for '%s'", attr, dest_name);
                goto out;
        }
        ret = g_strdup (value);
 out:
        return ret;
}

static gboolean
is_local_dest (const char  *name,
               cups_dest_t *dests,
               int          num_dests)
{
        char        *type_str;
        cups_ptype_t type;
        gboolean     is_remote;

        is_remote = TRUE;

        type_str = get_dest_attr (name, "printer-type", dests, num_dests);
        if (type_str == NULL) {
                goto out;
        }

        type = atoi (type_str);
        is_remote = type & (CUPS_PRINTER_REMOTE | CUPS_PRINTER_IMPLICIT);
        g_free (type_str);
 out:
        return !is_remote;
}

static int
strcmp0(const void *a, const void *b)
{
        return g_strcmp0 (*((gchar **) a), *((gchar **) b));
}

static void
on_cups_notification (GDBusConnection *connection,
                      const char      *sender_name,
                      const char      *object_path,
                      const char      *interface_name,
                      const char      *signal_name,
                      GVariant        *parameters,
                      gpointer         user_data)
{
        GsdPrintNotificationsManager *manager = (GsdPrintNotificationsManager *) user_data;
        gboolean                     printer_is_accepting_jobs;
        gboolean                     my_job = FALSE;
        http_t                      *http;
        gchar                       *printer_name = NULL;
        gchar                       *display_name = NULL;
        gchar                       *primary_text = NULL;
        gchar                       *secondary_text = NULL;
        gchar                       *text = NULL;
        gchar                       *printer_uri = NULL;
        gchar                       *printer_state_reasons = NULL;
        gchar                       *job_state_reasons = NULL;
        gchar                       *job_name = NULL;
        gchar                       *job_uri = NULL;
        guint                        job_id;
        ipp_t                       *request, *response;
        gint                         printer_state;
        gint                         job_state;
        gint                         job_impressions_completed;
        static const char * const reasons[] = {
                "toner-low",
                "toner-empty",
                "connecting-to-device",
                "cover-open",
                "cups-missing-filter",
                "door-open",
                "marker-supply-low",
                "marker-supply-empty",
                "media-low",
                "media-empty",
                "offline",
                "other"};

        static const char * statuses_first[] = {
                /* Translators: The printer is low on toner (same as in system-config-printer) */
                N_("Toner low"),
                /* Translators: The printer has no toner left (same as in system-config-printer) */
                N_("Toner empty"),
                /* Translators: The printer is in the process of connecting to a shared network output device (same as in system-config-printer) */
                N_("Not connected?"),
                /* Translators: One or more covers on the printer are open (same as in system-config-printer) */
                N_("Cover open"),
                /* Trnaslators: A filter or backend is not installed (same as in system-config-printer) */
                N_("Printer configuration error"),
                /* Translators: One or more doors on the printer are open (same as in system-config-printer) */
                N_("Door open"),
                /* Translators: "marker" is one color bin of the printer */
                N_("Marker supply low"),
                /* Translators: "marker" is one color bin of the printer */
                N_("Out of a marker supply"),
                /* Translators: At least one input tray is low on media (same as in system-config-printer) */
                N_("Paper low"),
                /* Translators: At least one input tray is empty (same as in system-config-printer) */
                N_("Out of paper"),
                /* Translators: The printer is offline (same as in system-config-printer) */
                N_("Printer off-line"),
                /* Translators: The printer has detected an error (same as in system-config-printer) */
                N_("Printer error") };

        static const char * statuses_second[] = {
                /* Translators: The printer is low on toner (same as in system-config-printer) */
                N_("Printer '%s' is low on toner."),
                /* Translators: The printer has no toner left (same as in system-config-printer) */
                N_("Printer '%s' has no toner left."),
                /* Translators: The printer is in the process of connecting to a shared network output device (same as in system-config-printer) */
                N_("Printer '%s' may not be connected."),
                /* Translators: One or more covers on the printer are open (same as in system-config-printer) */
                N_("The cover is open on printer '%s'."),
                /* Trnaslators: A filter or backend is not installed (same as in system-config-printer) */
                N_("There is a missing print filter for "
                   "printer '%s'."),
                /* Translators: One or more doors on the printer are open (same as in system-config-printer) */
                N_("The door is open on printer '%s'."),
                /* Translators: "marker" is one color bin of the printer */
                N_("Printer '%s' is low on a marker supply."),
                /* Translators: "marker" is one color bin of the printer */
                N_("Printer '%s' is out of a marker supply."),
                /* Translators: At least one input tray is low on media (same as in system-config-printer) */
                N_("Printer '%s' is low on paper."),
                /* Translators: At least one input tray is empty (same as in system-config-printer) */
                N_("Printer '%s' is out of paper."),
                /* Translators: The printer is offline (same as in system-config-printer) */
                N_("Printer '%s' is currently off-line."),
                /* Translators: The printer has detected an error (same as in system-config-printer) */
                N_("There is a problem on printer '%s'.") };

        if (g_strcmp0 (signal_name, "PrinterAdded") != 0 &&
            g_strcmp0 (signal_name, "PrinterDeleted") != 0 &&
            g_strcmp0 (signal_name, "PrinterStateChanged") != 0 &&
            g_strcmp0 (signal_name, "JobCompleted") != 0 &&
            g_strcmp0 (signal_name, "JobState") != 0 &&
            g_strcmp0 (signal_name, "JobCreated") != 0)
                return;

        if (g_variant_n_children (parameters) == 1) {
                g_variant_get (parameters, "(&s)", &text);
        } else if (g_variant_n_children (parameters) == 6) {
                g_variant_get (parameters, "(&s&s&su&sb)",
                               &text,
                               &printer_uri,
                               &printer_name,
                               &printer_state,
                               &printer_state_reasons,
                               &printer_is_accepting_jobs);
        } else if (g_variant_n_children (parameters) == 11) {
                ipp_attribute_t *attr;

                g_variant_get (parameters, "(&s&s&su&sbuu&s&su)",
                               &text,
                               &printer_uri,
                               &printer_name,
                               &printer_state,
                               &printer_state_reasons,
                               &printer_is_accepting_jobs,
                               &job_id,
                               &job_state,
                               &job_state_reasons,
                               &job_name,
                               &job_impressions_completed);

                if ((http = httpConnectEncrypt (cupsServer (), ippPort (),
                                                cupsEncryption ())) == NULL) {
                        g_debug ("Connection to CUPS server \'%s\' failed.", cupsServer ());
                }
                else {
                        job_uri = g_strdup_printf ("ipp://localhost/jobs/%d", job_id);

                        request = ippNewRequest(IPP_GET_JOB_ATTRIBUTES);
                        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "job-uri", NULL, job_uri);
                        ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                                     "requested-attributes", NULL, "job-originating-user-name");
                        response = cupsDoRequest(http, request, "/");

                        if (response) {
                                if (response->request.status.status_code <= IPP_OK_CONFLICT &&
                                    (attr = ippFindAttribute(response, "job-originating-user-name",
                                                             IPP_TAG_NAME))) {
                                        if (g_strcmp0 (attr->values[0].string.text, cupsUser ()) == 0)
                                                my_job = TRUE;
                                }
                                ippDelete(response);
                        }
                        g_free (job_uri);
                }
        }

        if (g_strcmp0 (signal_name, "PrinterAdded") == 0) {
                cupsFreeDests (manager->priv->num_dests, manager->priv->dests);
                manager->priv->num_dests = cupsGetDests (&manager->priv->dests);

                /* Translators: New printer has been added */
                if (is_local_dest (printer_name,
                                   manager->priv->dests,
                                   manager->priv->num_dests)) {
                        primary_text = g_strdup (_("Printer added"));
                        secondary_text = g_strdup (printer_name);
                }
        } else if (g_strcmp0 (signal_name, "PrinterDeleted") == 0) {
                /* Translators: A printer has been removed */
                if (is_local_dest (printer_name,
                                   manager->priv->dests,
                                   manager->priv->num_dests)) {
                        primary_text = g_strdup (_("Printer removed"));
                        secondary_text = g_strdup (printer_name);
                }

                cupsFreeDests (manager->priv->num_dests, manager->priv->dests);
                manager->priv->num_dests = cupsGetDests (&manager->priv->dests);
        } else if (g_strcmp0 (signal_name, "JobCompleted") == 0 && my_job) {
                /* FIXME: get a better human readable name */
                display_name = g_strdup (printer_name);

                switch (job_state) {
                        case IPP_JOB_PENDING:
                        case IPP_JOB_HELD:
                        case IPP_JOB_PROCESSING:
                                break;
                        case IPP_JOB_STOPPED:
                                /* Translators: A print job has been stopped */
                                primary_text = g_strdup (_("Printing stopped"));
                                /* Translators: "print-job xy" on a printer */
                                secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                                break;
                        case IPP_JOB_CANCELED:
                                /* Translators: A print job has been canceled */
                                primary_text = g_strdup (_("Printing canceled"));
                                /* Translators: "print-job xy" on a printer */
                                secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                                break;
                        case IPP_JOB_ABORTED:
                                /* Translators: A print job has been aborted */
                                primary_text = g_strdup (_("Printing aborted"));
                                /* Translators: "print-job xy" on a printer */
                                secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                                break;
                        case IPP_JOB_COMPLETED:
                                /* Translators: A print job has been completed */
                                primary_text = g_strdup (_("Printing completed"));
                                /* Translators: "print-job xy" on a printer */
                                secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                                break;
                }
        } else if (g_strcmp0 (signal_name, "JobState") == 0 && my_job) {
                display_name = get_dest_attr (printer_name,
                                              "printer-info",
                                              manager->priv->dests,
                                              manager->priv->num_dests);

                switch (job_state) {
                        case IPP_JOB_PROCESSING:
                                /* Translators: A job is printing */
                                primary_text = g_strdup (_("Printing"));
                                /* Translators: "print-job xy" on a printer */
                                secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                                break;
                        default:
                                break;
                }
        } else if (g_strcmp0 (signal_name, "JobCreated") == 0 && my_job) {
                display_name = get_dest_attr (printer_name,
                                              "printer-info",
                                              manager->priv->dests,
                                              manager->priv->num_dests);

                if (job_state == IPP_JOB_PROCESSING) {
                        /* Translators: A job is printing */
                        primary_text = g_strdup (_("Printing"));
                        /* Translators: "print-job xy" on a printer */
                        secondary_text = g_strdup_printf (_("\"%s\" on %s"), job_name, display_name);
                }
        } else if (g_strcmp0 (signal_name, "PrinterStateChanged") == 0) {
                cups_dest_t  *dest = NULL;
                const gchar  *tmp_printer_state_reasons = NULL;
                GSList       *added_reasons = NULL;
                GSList       *tmp_list = NULL;
                gchar       **old_state_reasons = NULL;
                gchar       **new_state_reasons = NULL;
                gint          i, j;

                /* FIXME: get a better human readable name */
                display_name = g_strdup (printer_name);

                dest = cupsGetDest (printer_name,
                                    NULL,
                                    manager->priv->num_dests,
                                    manager->priv->dests);
                if (dest)
                        tmp_printer_state_reasons = cupsGetOption ("printer-state-reasons",
                                                                   dest->num_options,
                                                                   dest->options);

                if (tmp_printer_state_reasons)
                        old_state_reasons = g_strsplit (tmp_printer_state_reasons, ",", -1);

                cupsFreeDests (manager->priv->num_dests, manager->priv->dests);
                manager->priv->num_dests = cupsGetDests (&manager->priv->dests);

                dest = cupsGetDest (printer_name,
                                    NULL,
                                    manager->priv->num_dests,
                                    manager->priv->dests);
                if (dest)
                        tmp_printer_state_reasons = cupsGetOption ("printer-state-reasons",
                                                                   dest->num_options,
                                                                   dest->options);

                if (tmp_printer_state_reasons)
                        new_state_reasons = g_strsplit (tmp_printer_state_reasons, ",", -1);

                if (new_state_reasons)
                        qsort (new_state_reasons,
                               g_strv_length (new_state_reasons),
                               sizeof (gchar *),
                               strcmp0);

                if (old_state_reasons) {
                        qsort (old_state_reasons,
                               g_strv_length (old_state_reasons),
                               sizeof (gchar *),
                               strcmp0);

                        j = 0;
                        for (i = 0; i < g_strv_length (new_state_reasons); i++) {
                                while (old_state_reasons[j] &&
                                       g_strcmp0 (old_state_reasons[j], new_state_reasons[i]) < 0)
                                        j++;

                                if (old_state_reasons[j] == NULL ||
                                    g_strcmp0 (old_state_reasons[j], new_state_reasons[i]) != 0)
                                        added_reasons = g_slist_append (added_reasons,
                                                                        new_state_reasons[i]);
                        }
                }
                else {
                        for (i = 0; i < g_strv_length (new_state_reasons); i++) {
                                added_reasons = g_slist_append (added_reasons,
                                                                new_state_reasons[i]);
                        }
                }

                for (tmp_list = added_reasons; tmp_list; tmp_list = tmp_list->next) {
                        gchar *data = (gchar *) tmp_list->data;
                        for (j = 0; j < G_N_ELEMENTS (reasons); j++) {
                                if (strncmp (data,
                                             reasons[j],
                                             strlen (reasons[j])) == 0) {
                                        NotifyNotification *notification;
                                        gchar *second_row = g_strdup_printf (statuses_second[j], printer_name);

                                        notification = notify_notification_new (statuses_first[j],
                                                                                second_row,
                                                                                "printer-symbolic");
                                        notify_notification_set_hint (notification,
                                                                      "transient",
                                                                      g_variant_new_boolean (TRUE));
                                        notify_notification_show (notification, NULL);

                                        g_object_unref (notification);
                                        g_free (second_row);
                                }
                        }
                }
                g_slist_free (added_reasons);
        }

        g_free (display_name);


        if (primary_text) {
                NotifyNotification *notification;
                notification = notify_notification_new (primary_text,
                                                        secondary_text,
                                                        "printer-symbolic");
                notify_notification_set_hint (notification, "transient", g_variant_new_boolean (TRUE));

                notify_notification_show (notification, NULL);
                g_object_unref (notification);
                g_free (primary_text);
                g_free (secondary_text);
        }
}

static void
scp_handler (GsdPrintNotificationsManager *manager,
             gboolean                      start)
{
        if (start) {
                GError *error = NULL;
                char *args[2];

                if (manager->priv->scp_handler_spawned)
                        return;

                args[0] = LIBEXECDIR "/gsd-printer";
                args[1] = NULL;

                g_spawn_async (NULL, args, NULL,
                               0, NULL, NULL,
                               &manager->priv->scp_handler_pid, &error);

                manager->priv->scp_handler_spawned = (error == NULL);

                if (error) {
                        g_warning ("Could not execute system-config-printer-udev handler: %s",
                                   error->message);
                        g_error_free (error);
                }
        }
        else if (manager->priv->scp_handler_spawned) {
                kill (manager->priv->scp_handler_pid, SIGHUP);
                g_spawn_close_pid (manager->priv->scp_handler_pid);
                manager->priv->scp_handler_spawned = FALSE;
        }
}

static void
cancel_subscription (gint id)
{
        http_t *http;
        ipp_t  *request;

        if (id >= 0 &&
            ((http = httpConnectEncrypt (cupsServer (), ippPort (),
                                        cupsEncryption ())) != NULL)) {
                request = ippNewRequest (IPP_CANCEL_SUBSCRIPTION);
                ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_URI,
                             "printer-uri", NULL, "/");
                ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                             "requesting-user-name", NULL, cupsUser ());
                ippAddInteger (request, IPP_TAG_OPERATION, IPP_TAG_INTEGER,
                              "notify-subscription-id", id);
                ippDelete (cupsDoRequest (http, request, "/"));
        }
}

static gboolean
renew_subscription (gpointer data)
{
        GsdPrintNotificationsManager *manager = (GsdPrintNotificationsManager *) data;
        ipp_attribute_t              *attr = NULL;
        http_t                       *http;
        ipp_t                        *request;
        ipp_t                        *response;
        gint                          num_events = 7;
        static const char * const events[] = {
                "job-created",
                "job-completed",
                "job-state-changed",
                "job-state",
                "printer-added",
                "printer-deleted",
                "printer-state-changed"};

        if ((http = httpConnectEncrypt (cupsServer (), ippPort (),
                                        cupsEncryption ())) == NULL) {
                g_debug ("Connection to CUPS server \'%s\' failed.", cupsServer ());
        }
        else {
                if (manager->priv->subscription_id >= 0) {
                        request = ippNewRequest (IPP_RENEW_SUBSCRIPTION);
                        ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_URI,
                                     "printer-uri", NULL, "/");
                        ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                                     "requesting-user-name", NULL, cupsUser ());
                        ippAddInteger (request, IPP_TAG_OPERATION, IPP_TAG_INTEGER,
                                      "notify-subscription-id", manager->priv->subscription_id);
                        ippAddInteger (request, IPP_TAG_SUBSCRIPTION, IPP_TAG_INTEGER,
                                      "notify-lease-duration", SUBSCRIPTION_DURATION);
                        ippDelete (cupsDoRequest (http, request, "/"));
                }
                else {
                        request = ippNewRequest (IPP_CREATE_PRINTER_SUBSCRIPTION);
                        ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_URI,
                                      "printer-uri", NULL,
                                      "/");
                        ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_NAME,
                                      "requesting-user-name", NULL, cupsUser ());
                        ippAddStrings (request, IPP_TAG_SUBSCRIPTION, IPP_TAG_KEYWORD,
                                       "notify-events", num_events, NULL, events);
                        ippAddString (request, IPP_TAG_SUBSCRIPTION, IPP_TAG_KEYWORD,
                                      "notify-pull-method", NULL, "ippget");
                        ippAddString (request, IPP_TAG_SUBSCRIPTION, IPP_TAG_URI,
                                      "notify-recipient-uri", NULL, "dbus://");
                        ippAddInteger (request, IPP_TAG_SUBSCRIPTION, IPP_TAG_INTEGER,
                                       "notify-lease-duration", SUBSCRIPTION_DURATION);
                        response = cupsDoRequest (http, request, "/");

                        if (response != NULL && response->request.status.status_code <= IPP_OK_CONFLICT) {
                                if ((attr = ippFindAttribute (response, "notify-subscription-id",
                                                              IPP_TAG_INTEGER)) == NULL)
                                        g_debug ("No notify-subscription-id in response!\n");
                                else
                                        manager->priv->subscription_id = attr->values[0].integer;
                        }

                        if (response)
                                ippDelete (response);
                }
                httpClose (http);
        }
        return TRUE;
}

static void
cancel_old_subscriptions ()
{
        http_t *http;
        ipp_t  *request;
        ipp_t  *response;
        static const char * const old_events[] = {
                "printer-state-changed",
                "printer-restarted",
                "printer-shutdown",
                "printer-stopped",
                "printer-added",
                "printer-deleted",
                "job-state-changed",
                "job-created",
                "job-completed",
                "job-stopped" };
        static const char * const older_events[] = {
                "printer-added",
                "printer-deleted",
                "job-state-changed",
                "job-created",
                "job-completed",
                "job-stopped" };

        if ((http = httpConnectEncrypt (cupsServer (), ippPort (),
                                        cupsEncryption ())) == NULL) {
                g_debug ("Connection to CUPS server \'%s\' failed.", cupsServer ());
        }
        else {
                request = ippNewRequest (IPP_GET_SUBSCRIPTIONS);
                ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_URI,
                              "printer-uri", NULL, "/");
                ippAddString (request, IPP_TAG_OPERATION, IPP_TAG_NAME, "requesting-user-name",
                              NULL, cupsUser ());
                ippAddBoolean (request, IPP_TAG_SUBSCRIPTION, "my-subscriptions", 1);
                response = cupsDoRequest (http, request, "/");

                if (response != NULL && response->request.status.status_code <= IPP_OK_CONFLICT) {
                        ipp_attribute_t *events;
                        ipp_attribute_t *attr;
                        gchar           *recipient_uri;
                        gint             lease_duration;
                        gint             id;
                        gint             i, j;

                        for (attr = response->attrs; attr; attr = attr->next) {
                                recipient_uri = NULL;
                                events = NULL;
                                id = -1;
                                lease_duration = -1;

                                while (attr && attr->group_tag != IPP_TAG_SUBSCRIPTION)
                                        attr = attr->next;

                                while (attr && attr->group_tag == IPP_TAG_SUBSCRIPTION) {
                                        if (g_strcmp0 (attr->name, "notify-subscription-id") == 0)
                                                id = attr->values[0].integer;
                                        else if (g_strcmp0 (attr->name, "notify-recipient-uri") == 0)
                                                recipient_uri = attr->values[0].string.text;
                                        else if (g_strcmp0 (attr->name, "notify-lease-duration") == 0)
                                                lease_duration = attr->values[0].integer;
                                        else if (g_strcmp0 (attr->name, "notify-events") == 0)
                                                events = attr;
                                        attr = attr->next;
                                }

                                if (recipient_uri && events && id >= 0 && lease_duration >=0) {
                                        gboolean remove = TRUE;
                                        gboolean have;
                                        gint length = 0;
                                        gint length2 = 0;

                                        if (lease_duration != 0)
                                                remove = FALSE;

                                        if (g_strcmp0 (recipient_uri, "dbus://") != 0)
                                                remove = FALSE;

                                        length = G_N_ELEMENTS (old_events);
                                        length2 = G_N_ELEMENTS (older_events);
                                        if (events->num_values != length &&
                                            events->num_values != length2)
                                                remove = FALSE;
                                        else {
                                                if (events->num_values == length)
                                                        for (i = 0; i < events->num_values; i++) {
                                                                have = FALSE;
                                                                for (j = 0; j < length; j++) {
                                                                        if (g_strcmp0 (events->values[i].string.text, old_events[j]) == 0)
                                                                                have = TRUE;
                                                                }
                                                                if (!have)
                                                                        remove = FALSE;
                                                        }

                                                if (events->num_values == length2)
                                                        for (i = 0; i < events->num_values; i++) {
                                                                have = FALSE;
                                                                for (j = 0; j < length2; j++) {
                                                                        if (g_strcmp0 (events->values[i].string.text, older_events[j]) == 0)
                                                                                have = TRUE;
                                                                }
                                                                if (!have)
                                                                        remove = FALSE;
                                                        }
                                        }

                                        if (remove)
                                                cancel_subscription (id);
                                }

                                if (!attr)
                                        break;
                        }
                }

                if (response) {
                        ippDelete (response);
                        response = NULL;
                }
        }
}

gboolean
gsd_print_notifications_manager_start (GsdPrintNotificationsManager *manager,
                                       GError                      **error)
{
        GError     *lerror;

        g_debug ("Starting print-notifications manager");

        gnome_settings_profile_start (NULL);

        manager->priv->subscription_id = -1;
        manager->priv->dests = NULL;
        manager->priv->num_dests = 0;
        manager->priv->scp_handler_spawned = FALSE;

        cancel_old_subscriptions ();

        renew_subscription (manager);
        g_timeout_add_seconds (RENEW_INTERVAL, renew_subscription, manager);

        manager->priv->num_dests = cupsGetDests (&manager->priv->dests);

        lerror = NULL;
        manager->priv->cups_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
                                                                   0,
                                                                   NULL,
                                                                   CUPS_DBUS_NAME,
                                                                   CUPS_DBUS_PATH,
                                                                   CUPS_DBUS_INTERFACE,
                                                                   NULL,
                                                                   &lerror);

        if (lerror != NULL) {
                g_propagate_error (error, lerror);
                return FALSE;
        }

        manager->priv->cups_bus_connection = g_dbus_proxy_get_connection (manager->priv->cups_proxy);

        g_dbus_connection_signal_subscribe (manager->priv->cups_bus_connection,
                                            NULL,
                                            CUPS_DBUS_INTERFACE,
                                            NULL,
                                            CUPS_DBUS_PATH,
                                            NULL,
                                            0,
                                            on_cups_notification,
                                            manager,
                                            NULL);

        scp_handler (manager, TRUE);

        gnome_settings_profile_end (NULL);

        return TRUE;
}

void
gsd_print_notifications_manager_stop (GsdPrintNotificationsManager *manager)
{
        g_debug ("Stopping print-notifications manager");

        cupsFreeDests (manager->priv->num_dests, manager->priv->dests);
        manager->priv->num_dests = 0;
        manager->priv->dests = NULL;

        if (manager->priv->subscription_id >= 0)
                cancel_subscription (manager->priv->subscription_id);

        manager->priv->cups_bus_connection = NULL;

        if (manager->priv->cups_proxy != NULL) {
                g_object_unref (manager->priv->cups_proxy);
                manager->priv->cups_proxy = NULL;
        }

        scp_handler (manager, FALSE);
}

static void
gsd_print_notifications_manager_set_property (GObject        *object,
                                              guint           prop_id,
                                              const GValue   *value,
                                              GParamSpec     *pspec)
{
        switch (prop_id) {
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
                break;
        }
}

static void
gsd_print_notifications_manager_get_property (GObject        *object,
                                              guint           prop_id,
                                              GValue         *value,
                                              GParamSpec     *pspec)
{
        switch (prop_id) {
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
                break;
        }
}

static GObject *
gsd_print_notifications_manager_constructor (GType                  type,
                                             guint                  n_construct_properties,
                                             GObjectConstructParam *construct_properties)
{
        GsdPrintNotificationsManager      *print_notifications_manager;

        print_notifications_manager = GSD_PRINT_NOTIFICATIONS_MANAGER (G_OBJECT_CLASS (gsd_print_notifications_manager_parent_class)->constructor (type,
                                                                                                                                                   n_construct_properties,
                                                                                                                                                   construct_properties));

        return G_OBJECT (print_notifications_manager);
}

static void
gsd_print_notifications_manager_dispose (GObject *object)
{
        G_OBJECT_CLASS (gsd_print_notifications_manager_parent_class)->dispose (object);
}

static void
gsd_print_notifications_manager_class_init (GsdPrintNotificationsManagerClass *klass)
{
        GObjectClass   *object_class = G_OBJECT_CLASS (klass);

        object_class->get_property = gsd_print_notifications_manager_get_property;
        object_class->set_property = gsd_print_notifications_manager_set_property;
        object_class->constructor = gsd_print_notifications_manager_constructor;
        object_class->dispose = gsd_print_notifications_manager_dispose;
        object_class->finalize = gsd_print_notifications_manager_finalize;

        g_type_class_add_private (klass, sizeof (GsdPrintNotificationsManagerPrivate));
}

static void
gsd_print_notifications_manager_init (GsdPrintNotificationsManager *manager)
{
        manager->priv = GSD_PRINT_NOTIFICATIONS_MANAGER_GET_PRIVATE (manager);

}

static void
gsd_print_notifications_manager_finalize (GObject *object)
{
        GsdPrintNotificationsManager *manager;

        g_return_if_fail (object != NULL);
        g_return_if_fail (GSD_IS_PRINT_NOTIFICATIONS_MANAGER (object));

        manager = GSD_PRINT_NOTIFICATIONS_MANAGER (object);

        g_return_if_fail (manager->priv != NULL);

        if (manager->priv->cups_proxy != NULL) {
                g_object_unref (manager->priv->cups_proxy);
        }

        G_OBJECT_CLASS (gsd_print_notifications_manager_parent_class)->finalize (object);
}

GsdPrintNotificationsManager *
gsd_print_notifications_manager_new (void)
{
        if (manager_object != NULL) {
                g_object_ref (manager_object);
        } else {
                manager_object = g_object_new (GSD_TYPE_PRINT_NOTIFICATIONS_MANAGER, NULL);
                g_object_add_weak_pointer (manager_object,
                                           (gpointer *) &manager_object);
        }

        return GSD_PRINT_NOTIFICATIONS_MANAGER (manager_object);
}
