path: root/calendar/alarm-notify/alarm-queue.c

/*
 * Alarm queueing engine
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Federico Mena-Quintero <federico@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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

#ifdef HAVE_CANBERRA
#include <canberra-gtk.h>
#endif

#ifdef HAVE_LIBNOTIFY
#include <libnotify/notify.h>
#endif

#include "alarm.h"
#include "alarm-notify-dialog.h"
#include "alarm-queue.h"
#include "alarm-notify.h"
#include "config-data.h"
#include "util.h"

#include "calendar/gui/print.h"

/* The dialog with alarm nofications */
static AlarmNotificationsDialog *alarm_notifications_dialog = NULL;

/* Whether the queueing system has been initialized */
static gboolean alarm_queue_inited = FALSE;

/* Clients we are monitoring for alarms */
static GHashTable *client_alarms_hash = NULL;

/* List of tray icons being displayed */
static GList *tray_icons_list = NULL;

/* Top Tray Image */
static GtkStatusIcon *tray_icon = NULL;
static gint tray_blink_id = -1;
static gint tray_blink_countdown = 0;
static AlarmNotify *an;

/* Structure that stores a client we are monitoring */
typedef struct {
    /* Monitored client */
    ECalClient *cal_client;

    /* The live view to the calendar */
    ECalClientView *view;

    /* Hash table of component UID -> CompQueuedAlarms.  If an element is
     * present here, then it means its cqa->queued_alarms contains at least
     * one queued alarm.  When all the alarms for a component have been
     * dequeued, the CompQueuedAlarms structure is removed from the hash
     * table.  Thus a CQA exists <=> it has queued alarms.
     */
    GHashTable *uid_alarms_hash;
} ClientAlarms;

/* Pair of a ECalComponentAlarms and the mapping from queued alarm IDs to the
 * actual alarm instance structures.
 */
typedef struct {
    /* The parent client alarms structure */
    ClientAlarms *parent_client;

    /* The component's UID */
    ECalComponentId *id;

    /* The actual component and its alarm instances */
    ECalComponentAlarms *alarms;

    /* List of QueuedAlarm structures */
    GSList *queued_alarms;

    /* Flags */
    gboolean expecting_update;
} CompQueuedAlarms;

/* Pair of a queued alarm ID and the alarm trigger instance it refers to */
typedef struct {
    /* Alarm ID from alarm.h */
    gpointer alarm_id;

    /* Instance from our parent CompQueuedAlarms->alarms->alarms list */
    ECalComponentAlarmInstance *instance;

    /* original trigger of the instance from component */
    time_t orig_trigger;

    /* Whether this is a snoozed queued alarm or a normal one */
    guint snooze : 1;
} QueuedAlarm;

/* Alarm ID for the midnight refresh function */
static gpointer midnight_refresh_id = NULL;
static time_t midnight = 0;

static void remove_client_alarms        (ClientAlarms *ca);
static void display_notification        (time_t trigger,
                         CompQueuedAlarms *cqa,
                         gpointer alarm_id,
                         gboolean use_description);
static void audio_notification      (time_t trigger,
                         CompQueuedAlarms *cqa,
                         gpointer alarm_id);
static void mail_notification       (time_t trigger,
                         CompQueuedAlarms *cqa,
                         gpointer alarm_id);
static void procedure_notification      (time_t trigger,
                         CompQueuedAlarms *cqa,
                         gpointer alarm_id);
#ifdef HAVE_LIBNOTIFY
static void popup_notification      (time_t trigger,
                         CompQueuedAlarms *cqa,
                         gpointer alarm_id,
                         gboolean use_description);
#endif
static void query_objects_modified_cb   (ECalClientView *view,
                         const GSList *objects,
                         gpointer data);
static void query_objects_removed_cb    (ECalClientView *view,
                         const GSList *uids,
                         gpointer data);

static void update_cqa          (CompQueuedAlarms *cqa,
                         ECalComponent *comp);
static void update_qa           (ECalComponentAlarms *alarms,
                         QueuedAlarm *qa);
static void tray_list_remove_cqa        (CompQueuedAlarms *cqa);
static void on_dialog_objs_removed_cb   (ECalClientView *view,
                         const GSList *uids,
                         gpointer data);

/* Alarm queue engine */

static void load_alarms_for_today       (ClientAlarms *ca);
static void midnight_refresh_cb     (gpointer alarm_id,
                         time_t trigger,
                         gpointer data);

/* Simple asynchronous message dispatcher */

typedef struct _Message Message;
typedef void (*MessageFunc) (Message *msg);

struct _Message {
    MessageFunc func;
};

/*
static void
message_proxy (Message *msg)
{
    g_return_if_fail (msg->func != NULL);
 *
    msg->func (msg);
}
 *
static gpointer
create_thread_pool (void)
{
    return g_thread_pool_new ((GFunc) message_proxy, NULL, 1, FALSE, NULL);
}*/

static void
message_push (Message *msg)
{
    /* This used be pushed through the thread pool. This fix is made to
     * work-around the crashers in dbus due to threading. The threading
     * is not completely removed as its better to have alarm daemon
     * running in a thread rather than blocking main thread.  This is
     * the reason the creation of thread pool is commented out. */
    msg->func (msg);
}

/*
 * use a static ring-buffer so we can call this twice
 * in a printf without getting nonsense results.
 */
static const gchar *
e_ctime (const time_t *timep)
{
    static gchar *buffer[4] = { 0, };
    static gint next = 0;
    const gchar *ret;

    g_free (buffer[next]);
    ret = buffer[next++] = g_strdup (ctime (timep));
    if (buffer[next - 1] && *buffer[next - 1]) {
        gint len = strlen (buffer[next - 1]);
        while (len > 0 && (buffer[next - 1][len - 1] == '\n' ||
            buffer[next - 1][len - 1] == '\r' ||
            g_ascii_isspace (buffer[next - 1][len - 1])))
            len--;

        buffer[next - 1][len - 1] = 0;
    }

    if (next >= G_N_ELEMENTS (buffer))
        next = 0;

    return ret;
}

/* Queues an alarm trigger for midnight so that we can load the next
 * day's worth of alarms. */
static void
queue_midnight_refresh (void)
{
    icaltimezone *zone;

    if (midnight_refresh_id != NULL) {
        alarm_remove (midnight_refresh_id);
        midnight_refresh_id = NULL;
    }

    zone = config_data_get_timezone ();
    midnight = time_day_end_with_zone (time (NULL), zone);

    debug (("Refresh at %s", e_ctime (&midnight)));

    midnight_refresh_id = alarm_add (
        midnight, midnight_refresh_cb, NULL, NULL);
    if (!midnight_refresh_id) {
        debug (("Could not setup the midnight refresh alarm"));
        /* FIXME: what to do? */
    }
}

/* Loads a client's alarms; called from g_hash_table_foreach() */
static void
add_client_alarms_cb (gpointer key,
                      gpointer value,
                      gpointer data)
{
    ClientAlarms *ca = (ClientAlarms *) value;

    debug (("Adding %p", ca));

    load_alarms_for_today (ca);
}

struct _midnight_refresh_msg {
    Message header;
    gboolean remove;
};

/* Loads the alarms for the new day every midnight */
static void
midnight_refresh_async (struct _midnight_refresh_msg *msg)
{
    debug (("..."));

    /* Re-load the alarms for all clients */
    g_hash_table_foreach (client_alarms_hash, add_client_alarms_cb, NULL);

    /* Re-schedule the midnight update */
    if (msg->remove && midnight_refresh_id != NULL) {
        debug (("Reschedule the midnight update"));
        alarm_remove (midnight_refresh_id);
        midnight_refresh_id = NULL;
    }

    queue_midnight_refresh ();

    g_slice_free (struct _midnight_refresh_msg, msg);
}

static void
midnight_refresh_cb (gpointer alarm_id,
                     time_t trigger,
                     gpointer data)
{
    struct _midnight_refresh_msg *msg;

    msg = g_slice_new0 (struct _midnight_refresh_msg);
    msg->header.func = (MessageFunc) midnight_refresh_async;
    msg->remove = TRUE;

    message_push ((Message *) msg);
}

/* Looks up a client in the client alarms hash table */
static ClientAlarms *
lookup_client (ECalClient *cal_client)
{
    return g_hash_table_lookup (client_alarms_hash, cal_client);
}

/* Looks up a queued alarm based on its alarm ID */
static QueuedAlarm *
lookup_queued_alarm (CompQueuedAlarms *cqa,
                     gpointer alarm_id)
{
    GSList *l;
    QueuedAlarm *qa;

    qa = NULL;

    for (l = cqa->queued_alarms; l; l = l->next) {
        qa = l->data;
        if (qa->alarm_id == alarm_id)
            return qa;
    }

    /* not found, might have been updated/removed */
    return NULL;
}

/* Removes an alarm from the list of alarms of a component.  If the alarm was
 * the last one listed for the component, it removes the component itself.
 */
static gboolean
remove_queued_alarm (CompQueuedAlarms *cqa,
                     gpointer alarm_id,
                     gboolean free_object,
                     gboolean remove_alarm)
{
    QueuedAlarm *qa = NULL;
    GSList *l;

    debug (("..."));

    for (l = cqa->queued_alarms; l; l = l->next) {
        qa = l->data;
        if (qa->alarm_id == alarm_id)
            break;
    }

    if (!l)
        return FALSE;

    cqa->queued_alarms = g_slist_delete_link (cqa->queued_alarms, l);

    if (remove_alarm) {
        GError *error = NULL;
        ECalComponentId *id;

        id = e_cal_component_get_id (cqa->alarms->comp);
        if (id) {
            cqa->expecting_update = TRUE;
            e_cal_client_discard_alarm_sync (
                cqa->parent_client->cal_client, id->uid,
                id->rid, qa->instance->auid, NULL, &error);
            cqa->expecting_update = FALSE;

            if (g_error_matches (error, E_CLIENT_ERROR, E_CLIENT_ERROR_NOT_SUPPORTED)) {
                g_error_free (error);

            } else if (error != NULL) {
                g_warning (
                    "%s: Failed to discard alarm: %s",
                    G_STRFUNC, error->message);
                g_error_free (error);
            }

            e_cal_component_free_id (id);
        }
    }

    g_free (qa);

    /* If this was the last queued alarm for this component, remove the
     * component itself.
     */

    if (cqa->queued_alarms != NULL)
        return FALSE;

    debug (("Last Component. Removing CQA- Free=%d", free_object));
    if (free_object) {
        cqa->id = NULL;
        cqa->parent_client = NULL;
        e_cal_component_alarms_free (cqa->alarms);
        g_free (cqa);
    } else {
        e_cal_component_alarms_free (cqa->alarms);
        cqa->alarms = NULL;
    }

    return TRUE;
}

/**
 * has_known_notification:
 * Test for notification method and returns if it knows it or not.
 * @comp: Component with an alarm.
 * @alarm_uid: ID of the alarm in the comp to test.
 *
 * Returns: %TRUE when we know the notification type, %FALSE otherwise.
 */
static gboolean
has_known_notification (ECalComponent *comp,
                        const gchar *alarm_uid)
{
    ECalComponentAlarm *alarm;
    ECalComponentAlarmAction action;

    g_return_val_if_fail (comp != NULL, FALSE);
    g_return_val_if_fail (alarm_uid != NULL, FALSE);

    alarm = e_cal_component_get_alarm (comp, alarm_uid);
    if (!alarm)
         return FALSE;

    e_cal_component_alarm_get_action (alarm, &action);
    e_cal_component_alarm_free (alarm);

    switch (action) {
        case E_CAL_COMPONENT_ALARM_AUDIO:
        case E_CAL_COMPONENT_ALARM_DISPLAY:
        case E_CAL_COMPONENT_ALARM_EMAIL:
        case E_CAL_COMPONENT_ALARM_PROCEDURE:
            return TRUE;
        default:
            break;
    }

    return FALSE;
}

/* Callback used when an alarm triggers */
static void
alarm_trigger_cb (gpointer alarm_id,
                  time_t trigger,
                  gpointer data)
{
    CompQueuedAlarms *cqa;
    ECalComponent *comp;
    QueuedAlarm *qa;
    ECalComponentAlarm *alarm;
    ECalComponentAlarmAction action;

    cqa = data;
    comp = cqa->alarms->comp;

    config_data_set_last_notification_time (
        cqa->parent_client->cal_client, trigger);
    debug (("Setting Last notification time to %s", e_ctime (&trigger)));

    qa = lookup_queued_alarm (cqa, alarm_id);
    if (!qa)
        return;

    /* Decide what to do based on the alarm action.  We use the trigger that
     * is passed to us instead of the one from the instance structure
     * because this may be a snoozed alarm instead of an original
     * occurrence.
     */

    alarm = e_cal_component_get_alarm (comp, qa->instance->auid);
    if (!alarm)
         return;

    e_cal_component_alarm_get_action (alarm, &action);
    e_cal_component_alarm_free (alarm);

    switch (action) {
    case E_CAL_COMPONENT_ALARM_AUDIO:
        audio_notification (trigger, cqa, alarm_id);
        break;

    case E_CAL_COMPONENT_ALARM_DISPLAY:
#ifdef HAVE_LIBNOTIFY
        popup_notification (trigger, cqa, alarm_id, TRUE);
#endif
        display_notification (trigger, cqa, alarm_id, TRUE);
        break;

    case E_CAL_COMPONENT_ALARM_EMAIL:
        mail_notification (trigger, cqa, alarm_id);
        break;

    case E_CAL_COMPONENT_ALARM_PROCEDURE:
        procedure_notification (trigger, cqa, alarm_id);
        break;

    default:
        g_return_if_reached ();
    }
    debug (("Notification sent: %d", action));
}

/* Adds the alarms in a ECalComponentAlarms structure to the alarms queued for a
 * particular client.  Also puts the triggers in the alarm timer queue.
 */
static void
add_component_alarms (ClientAlarms *ca,
                      ECalComponentAlarms *alarms)
{
    ECalComponentId *id;
    CompQueuedAlarms *cqa;
    GSList *l;

    /* No alarms? */
    if (alarms == NULL || alarms->alarms == NULL) {
        debug (("No alarms to add"));
        if (alarms)
            e_cal_component_alarms_free (alarms);
        return;
    }

    cqa = g_new (CompQueuedAlarms, 1);
    cqa->parent_client = ca;
    cqa->alarms = alarms;
    cqa->expecting_update = FALSE;

    cqa->queued_alarms = NULL;
    debug (("Creating CQA %p", cqa));

    for (l = alarms->alarms; l; l = l->next) {
        ECalComponentAlarmInstance *instance;
        gpointer alarm_id;
        QueuedAlarm *qa;

        instance = l->data;

        if (!has_known_notification (cqa->alarms->comp, instance->auid))
            continue;

        alarm_id = alarm_add (
            instance->trigger, alarm_trigger_cb, cqa, NULL);
        if (!alarm_id)
            continue;

        qa = g_new (QueuedAlarm, 1);
        qa->alarm_id = alarm_id;
        qa->instance = instance;
        qa->orig_trigger = instance->trigger;
        qa->snooze = FALSE;

        cqa->queued_alarms = g_slist_prepend (cqa->queued_alarms, qa);
    }

    id = e_cal_component_get_id (alarms->comp);

    /* If we failed to add all the alarms, then we should get rid of the cqa */
    if (cqa->queued_alarms == NULL) {
        e_cal_component_alarms_free (cqa->alarms);
        cqa->alarms = NULL;
        debug (("Failed to add all : %p", cqa));
        g_free (cqa);
        return;
    }

    cqa->queued_alarms = g_slist_reverse (cqa->queued_alarms);
    cqa->id = id;
    debug (("Alarm added for %s", id->uid));
    g_hash_table_insert (ca->uid_alarms_hash, cqa->id, cqa);
}

/* Loads the alarms of a client for a given range of time */
static void
load_alarms (ClientAlarms *ca,
             time_t start,
             time_t end)
{
    gchar *str_query, *iso_start, *iso_end;
    GError *error = NULL;

    debug (("..."));

    iso_start = isodate_from_time_t (start);
    if (!iso_start)
        return;

    iso_end = isodate_from_time_t (end);
    if (!iso_end) {
        g_free (iso_start);
        return;
    }

    str_query = g_strdup_printf (
        "(has-alarms-in-range? (make-time \"%s\") "
        "(make-time \"%s\"))", iso_start, iso_end);
    g_free (iso_start);
    g_free (iso_end);

    /* create the live query */
    if (ca->view) {
        debug (("Disconnecting old queries"));
        g_signal_handlers_disconnect_matched (
            ca->view, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, ca);
        g_object_unref (ca->view);
        ca->view = NULL;
    }

    e_cal_client_get_view_sync (
        ca->cal_client, str_query, &ca->view, NULL, &error);

    if (error != NULL) {
        g_warning (
            "%s: Could not get query for client: %s",
            G_STRFUNC, error->message);
        g_error_free (error);
    } else {
        debug (("Setting Call backs"));

        g_signal_connect (
            ca->view, "objects-added",
            G_CALLBACK (query_objects_modified_cb), ca);
        g_signal_connect (
            ca->view, "objects-modified",
            G_CALLBACK (query_objects_modified_cb), ca);
        g_signal_connect (
            ca->view, "objects-removed",
            G_CALLBACK (query_objects_removed_cb), ca);

        e_cal_client_view_start (ca->view, &error);

        if (error != NULL) {
            g_warning (
                "%s: Failed to start view: %s",
                G_STRFUNC, error->message);
            g_error_free (error);
        }
    }

    g_free (str_query);
}

/* Loads today's remaining alarms for a client */
static void
load_alarms_for_today (ClientAlarms *ca)
{
    time_t now, from, day_end, day_start;
    icaltimezone *zone;

    now = time (NULL);
    zone = config_data_get_timezone ();
    day_start = time_day_begin_with_zone (now, zone);

    /* Make sure we don't miss some events from the last notification.
     * We add 1 to the saved notification time to make the time ranges
     * half-open; we do not want to display the "last" displayed alarm
     * twice, once when it occurs and once when the alarm daemon restarts.
     */
    from = config_data_get_last_notification_time (ca->cal_client) + 1;
    if (from <= 0)
        from = MAX (from, day_start);

    /* Add one hour after midnight, just to cover the delay in 30 minutes
     * midnight checking. */
    day_end = time_day_end_with_zone (now, zone) + (60 * 60);
    debug (("From %s to %s", e_ctime (&from), e_ctime (&day_end)));
    load_alarms (ca, from, day_end);
}

/* Looks up a component's queued alarm structure in a client alarms structure */
static CompQueuedAlarms *
lookup_comp_queued_alarms (ClientAlarms *ca,
                           const ECalComponentId *id)
{
    return g_hash_table_lookup (ca->uid_alarms_hash, id);
}

static void
remove_alarms (CompQueuedAlarms *cqa,
               gboolean free_object)
{
    GSList *l;

    debug (("Removing for %p", cqa));

    tray_list_remove_cqa (cqa);

    for (l = cqa->queued_alarms; l;) {
        QueuedAlarm *qa;

        qa = l->data;

        /* Get the next element here because the list element will go
         * away in remove_queued_alarm().  The qa will be freed there as
         * well.
         */
        l = l->next;

        alarm_remove (qa->alarm_id);
        remove_queued_alarm (cqa, qa->alarm_id, free_object, FALSE);
    }
}

/* Removes a component an its alarms */
static void
remove_comp (ClientAlarms *ca,
             ECalComponentId *id)
{
    CompQueuedAlarms *cqa;

    debug (("Removing uid %s", id->uid));

    if (id->rid && !(*(id->rid))) {
        g_free (id->rid);
        id->rid = NULL;
    }

    cqa = lookup_comp_queued_alarms (ca, id);
    if (!cqa)
        return;

    /* If a component is present, then it means we must have alarms queued
     * for it.
     */
    g_return_if_fail (cqa->queued_alarms != NULL);

    debug (("Removing CQA %p", cqa));
    remove_alarms (cqa, TRUE);
}

/* Called when a calendar component changes; we must reload its corresponding
 * alarms.
 */
struct _query_msg {
    Message header;
    GSList *objects;
    gpointer data;
};

static GSList *
duplicate_ical (const GSList *in_list)
{
    const GSList *l;
    GSList *out_list = NULL;
    for (l = in_list; l; l = l->next) {
        out_list = g_slist_prepend (
            out_list, icalcomponent_new_clone (l->data));
    }

    return g_slist_reverse (out_list);
}

static GSList *
duplicate_ecal (const GSList *in_list)
{
    const GSList *l;
    GSList *out_list = NULL;
    for (l = in_list; l; l = l->next) {
        ECalComponentId *id, *old;
        old = l->data;
        id = g_new0 (ECalComponentId, 1);
        id->uid = g_strdup (old->uid);
        id->rid = g_strdup (old->rid);
        out_list = g_slist_prepend (out_list, id);
    }

    return g_slist_reverse (out_list);
}

static gboolean
get_alarms_for_object (ECalClient *cal_client,
                       const ECalComponentId *id,
                       time_t start,
                       time_t end,
                       ECalComponentAlarms **alarms)
{
    icalcomponent *icalcomp = NULL;
    ECalComponent *comp;
    ECalComponentAlarmAction omit[] = {-1};

    g_return_val_if_fail (cal_client != NULL, FALSE);
    g_return_val_if_fail (id != NULL, FALSE);
    g_return_val_if_fail (alarms != NULL, FALSE);
    g_return_val_if_fail (start >= 0 && end >= 0, FALSE);
    g_return_val_if_fail (start <= end, FALSE);

    e_cal_client_get_object_sync (
        cal_client, id->uid, id->rid, &icalcomp, NULL, NULL);

    if (icalcomp == NULL)
        return FALSE;

    comp = e_cal_component_new ();
    if (!e_cal_component_set_icalcomponent (comp, icalcomp)) {
        icalcomponent_free (icalcomp);
        g_object_unref (comp);
        return FALSE;
    }

    *alarms = e_cal_util_generate_alarms_for_comp (
        comp, start, end, omit, e_cal_client_resolve_tzid_cb,
        cal_client, e_cal_client_get_default_timezone (cal_client));

    g_object_unref (comp);

    return TRUE;
}

static void
query_objects_changed_async (struct _query_msg *msg)
{
    ClientAlarms *ca;
    time_t from, day_end;
    ECalComponentAlarms *alarms;
    gboolean found;
    icaltimezone *zone;
    CompQueuedAlarms *cqa;
    GSList *l;
    GSList *objects;

    ca = msg->data;
    objects = msg->objects;

    from = config_data_get_last_notification_time (ca->cal_client);
    if (from == -1)
        from = time (NULL);
    else
        from += 1; /* we add 1 to make sure the alarm is not displayed twice */

    zone = config_data_get_timezone ();

    day_end = time_day_end_with_zone (time (NULL), zone);

    for (l = objects; l != NULL; l = l->next) {
        ECalComponentId *id;
        GSList *sl;
        ECalComponent *comp = e_cal_component_new ();

        e_cal_component_set_icalcomponent (comp, l->data);

        id = e_cal_component_get_id (comp);
        found = get_alarms_for_object (ca->cal_client, id, from, day_end, &alarms);

        if (!found) {
            debug (("No Alarm found for client %p", ca->cal_client));
            tray_list_remove_cqa (lookup_comp_queued_alarms (ca, id));
            remove_comp (ca, id);
            g_hash_table_remove (ca->uid_alarms_hash, id);
            e_cal_component_free_id (id);
            g_object_unref (comp);
            comp = NULL;
            continue;
        }

        cqa = lookup_comp_queued_alarms (ca, id);
        if (!cqa) {
            debug (("No currently queued alarms for %s", id->uid));
            add_component_alarms (ca, alarms);
            g_object_unref (comp);
            comp = NULL;
            continue;
        }

        debug (("Alarm Already Exist for %s", id->uid));
        /* If the alarms or the alarms list is empty,
         * remove it after updating the cqa structure. */
        if (alarms == NULL || alarms->alarms == NULL) {

            /* Update the cqa and its queued alarms
             * for changes in summary and alarm_uid.  */
            update_cqa (cqa, comp);

            if (alarms)
                e_cal_component_alarms_free (alarms);
            continue;
        }

        /* if already in the list, just update it */
        remove_alarms (cqa, FALSE);
        cqa->alarms = alarms;
        cqa->queued_alarms = NULL;

        /* add the new alarms */
        for (sl = cqa->alarms->alarms; sl; sl = sl->next) {
            ECalComponentAlarmInstance *instance;
            gpointer alarm_id;
            QueuedAlarm *qa;

            instance = sl->data;

            if (!has_known_notification (cqa->alarms->comp, instance->auid))
                continue;

            alarm_id = alarm_add (instance->trigger, alarm_trigger_cb, cqa, NULL);
            if (!alarm_id)
                continue;

            qa = g_new (QueuedAlarm, 1);
            qa->alarm_id = alarm_id;
            qa->instance = instance;
            qa->snooze = FALSE;
            qa->orig_trigger = instance->trigger;
            cqa->queued_alarms = g_slist_prepend (cqa->queued_alarms, qa);
            debug (("Adding %p to queue", qa));
        }

        cqa->queued_alarms = g_slist_reverse (cqa->queued_alarms);
        g_object_unref (comp);
        comp = NULL;
    }
    g_slist_free (objects);

    g_slice_free (struct _query_msg, msg);
}

static void
query_objects_modified_cb (ECalClientView *view,
                           const GSList *objects,
                           gpointer data)
{
    struct _query_msg *msg;

    msg = g_slice_new0 (struct _query_msg);
    msg->header.func = (MessageFunc) query_objects_changed_async;
    msg->objects = duplicate_ical (objects);
    msg->data = data;

    message_push ((Message *) msg);
}

/* Called when a calendar component is removed; we must delete its corresponding
 * alarms.
 */
static void
query_objects_removed_async (struct _query_msg *msg)
{
    ClientAlarms *ca;
    GSList *l;
    GSList *objects;

    ca = msg->data;
    objects = msg->objects;

    debug (("Removing %d objects", g_slist_length (objects)));

    for (l = objects; l != NULL; l = l->next) {
        /* If the alarm is already triggered remove it. */
        tray_list_remove_cqa (lookup_comp_queued_alarms (ca, l->data));
        remove_comp (ca, l->data);
        g_hash_table_remove (ca->uid_alarms_hash, l->data);
        e_cal_component_free_id (l->data);
    }

    g_slist_free (objects);

    g_slice_free (struct _query_msg, msg);
}

static void
query_objects_removed_cb (ECalClientView *view,
                          const GSList *uids,
                          gpointer data)
{
    struct _query_msg *msg;

    msg = g_slice_new0 (struct _query_msg);
    msg->header.func = (MessageFunc) query_objects_removed_async;
    msg->objects = duplicate_ecal (uids);
    msg->data = data;

    message_push ((Message *) msg);
}

/* Notification functions */

/* Creates a snooze alarm based on an existing one.  The snooze offset is
 * compued with respect to the current time.
 */
static void
create_snooze (CompQueuedAlarms *cqa,
               gpointer alarm_id,
               gint snooze_mins)
{
    QueuedAlarm *orig_qa;
    time_t t;
    gpointer new_id;

    orig_qa = lookup_queued_alarm (cqa, alarm_id);
    if (!orig_qa)
        return;

    t = time (NULL);
    t += snooze_mins * 60;

    new_id = alarm_add (t, alarm_trigger_cb, cqa, NULL);
    if (!new_id) {
        debug (("Unable to schedule trigger for %s", e_ctime (&t)));
        return;
    }

    orig_qa->instance->trigger = t;
    orig_qa->alarm_id = new_id;
    orig_qa->snooze = TRUE;
    debug (("Adding a alarm at %s", e_ctime (&t)));
}

/* Launches a component editor for a component */
static void
edit_component (ECalClient *cal_client,
                ECalComponent *comp)
{
    ESource *source;
    gchar *command_line;
    const gchar *scheme;
    const gchar *comp_uid;
    const gchar *source_uid;
    GError *error = NULL;

    /* XXX Don't we have a function to construct these URIs?
     *     How are other apps expected to know this stuff? */

    source = e_client_get_source (E_CLIENT (cal_client));
    source_uid = e_source_get_uid (source);

    e_cal_component_get_uid (comp, &comp_uid);

    switch (e_cal_client_get_source_type (cal_client)) {
        case E_CAL_CLIENT_SOURCE_TYPE_EVENTS:
            scheme = "calendar:";
            break;
        case E_CAL_CLIENT_SOURCE_TYPE_TASKS:
            scheme = "task:";
            break;
        case E_CAL_CLIENT_SOURCE_TYPE_MEMOS:
            scheme = "memo:";
            break;
        default:
            g_return_if_reached ();
    }

    command_line = g_strdup_printf (
        "%s %s///?source-uid=%s&comp-uid=%s",
        PACKAGE, scheme, source_uid, comp_uid);

    if (!g_spawn_command_line_async (command_line, &error)) {
        g_critical ("%s", error->message);
        g_error_free (error);
    }

    g_free (command_line);
}

static void
print_component (ECalClient *cal_client,
                 ECalComponent *comp)
{
    print_comp (
        comp,
        cal_client,
        config_data_get_timezone (),
        config_data_get_24_hour_format (),
        GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG);
}

typedef struct {
    gchar *summary;
    gchar *description;
    gchar *location;
    gboolean blink_state;
    gboolean snooze_set;
    gint blink_id;
    time_t trigger;
    CompQueuedAlarms *cqa;
    gpointer alarm_id;
    ECalComponent *comp;
    ECalClient *cal_client;
    ECalClientView *view;
    GdkPixbuf *image;
    GtkTreeIter iter;
    gboolean is_in_tree;
} TrayIconData;

static void
free_tray_icon_data (TrayIconData *tray_data)
{
    g_return_if_fail (tray_data != NULL);

    if (tray_data->summary) {
        g_free (tray_data->summary);
        tray_data->summary = NULL;
    }

    if (tray_data->description) {
        g_free (tray_data->description);
        tray_data->description = NULL;
    }

    if (tray_data->location) {
        g_free (tray_data->location);
        tray_data->location = NULL;
    }

    g_object_unref (tray_data->cal_client);
    tray_data->cal_client = NULL;

    g_signal_handlers_disconnect_matched (
        tray_data->view, G_SIGNAL_MATCH_FUNC,
        0, 0, NULL, on_dialog_objs_removed_cb, NULL);
    g_object_unref (tray_data->view);
    tray_data->view = NULL;

    g_object_unref (tray_data->comp);
    tray_data->comp = NULL;

    tray_data->cqa = NULL;
    tray_data->alarm_id = NULL;
    tray_data->image = NULL;

    g_free (tray_data);
}

static void
on_dialog_objs_removed_async (struct _query_msg *msg)
{
    TrayIconData *tray_data;
    GSList *l, *objects;
    ECalComponentId *our_id;

    debug (("..."));

    tray_data = msg->data;
    objects = msg->objects;

    our_id = e_cal_component_get_id (tray_data->comp);
    g_return_if_fail (our_id);

    for (l = objects; l != NULL; l = l->next) {
        ECalComponentId *id = l->data;

        if (!id)
            continue;

        if (tray_data &&
            g_strcmp0 (id->uid, our_id->uid) == 0 &&
            g_strcmp0 (id->rid, our_id->rid) == 0) {
            tray_data->cqa = NULL;
            tray_data->alarm_id = NULL;
            tray_icons_list = g_list_remove (
                tray_icons_list, tray_data);
            tray_data = NULL;
        }

        e_cal_component_free_id (id);
    }

    e_cal_component_free_id (our_id);
    g_slist_free (objects);
    g_slice_free (struct _query_msg, msg);
}

static void
on_dialog_objs_removed_cb (ECalClientView *view,
                           const GSList *uids,
                           gpointer data)
{
    struct _query_msg *msg;

    msg = g_slice_new0 (struct _query_msg);
    msg->header.func = (MessageFunc) on_dialog_objs_removed_async;
    msg->objects = duplicate_ecal (uids);
    msg->data = data;

    message_push ((Message *) msg);
}

struct _tray_cqa_msg {
    Message header;
    CompQueuedAlarms *cqa;
};

static void
tray_list_remove_cqa_async (struct _tray_cqa_msg *msg)
{
    CompQueuedAlarms *cqa = msg->cqa;
    GList *list = tray_icons_list;

    debug (("Removing CQA %p from tray list", cqa));

    while (list) {
        TrayIconData *tray_data = list->data;
        GList *tmp = list;
        GtkTreeModel *model;

        list = list->next;
        if (tray_data->cqa == cqa) {
            debug (("Found"));
            tray_icons_list = g_list_delete_link (tray_icons_list, tmp);
            if (alarm_notifications_dialog && tray_data->is_in_tree) {
                model = gtk_tree_view_get_model (
                    GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
                gtk_list_store_remove (GTK_LIST_STORE (model), &(tray_data->iter));
                tray_data->is_in_tree = FALSE;
            }
            free_tray_icon_data (tray_data);
        }
    }

    debug (("%d alarms left", g_list_length (tray_icons_list)));

    if (alarm_notifications_dialog) {
        if (!g_list_length (tray_icons_list)) {
            gtk_widget_destroy (alarm_notifications_dialog->dialog);
            g_free (alarm_notifications_dialog);
            alarm_notifications_dialog = NULL;
        } else {
            GtkTreeIter iter;
            GtkTreeModel *model;
            GtkTreeSelection *sel;

            model = gtk_tree_view_get_model (
                GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
            if (gtk_tree_model_get_iter_first (model, &iter)) {
                sel = gtk_tree_view_get_selection (
                    GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
                gtk_tree_selection_select_iter (sel, &iter);
            }
        }
    }

    g_slice_free (struct _tray_cqa_msg, msg);
}

static void
tray_list_remove_cqa (CompQueuedAlarms *cqa)
{
    struct _tray_cqa_msg *msg;

    msg = g_slice_new0 (struct _tray_cqa_msg);
    msg->header.func = (MessageFunc) tray_list_remove_cqa_async;
    msg->cqa = cqa;

    message_push ((Message *) msg);
}

/* Callback used from the alarm notify dialog */
static void
tray_list_remove_async (Message *msg)
{
    GList *list = tray_icons_list;

    debug (("Removing %d alarms", g_list_length (list)));
    while (list != NULL) {

        TrayIconData *tray_data = list->data;

        if (!tray_data->snooze_set) {
            GList *temp = list->next;
            gboolean status;

            tray_icons_list = g_list_remove_link (tray_icons_list, list);
            if (alarm_notifications_dialog && tray_data->is_in_tree) {
                GtkTreeModel *model = gtk_tree_view_get_model (GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
                gtk_list_store_remove (GTK_LIST_STORE (model), &tray_data->iter);
                tray_data->is_in_tree = FALSE;
            }
            status = remove_queued_alarm (
                tray_data->cqa,
                tray_data->alarm_id, FALSE, TRUE);
            if (status) {
                g_hash_table_remove (
                    tray_data->cqa->parent_client->uid_alarms_hash,
                    tray_data->cqa->id);
                e_cal_component_free_id (tray_data->cqa->id);
                g_free (tray_data->cqa);
            }
            free_tray_icon_data (tray_data);
            tray_data = NULL;
            g_list_free_1 (list);
            if (tray_icons_list != list)    /* List head is modified */
                list = tray_icons_list;
            else
                list = temp;
        } else
            list = list->next;
    }

    g_slice_free (Message, msg);
}

static void
tray_list_remove_icons (void)
{
    Message *msg;

    msg = g_slice_new0 (Message);
    msg->func = tray_list_remove_async;

    message_push (msg);
}

struct _tray_msg {
    Message header;
    TrayIconData *data;
};

static void
tray_list_remove_data_async (struct _tray_msg *msg)
{
    TrayIconData *tray_data = msg->data;

    debug (("Removing %p from tray list", tray_data));

    tray_icons_list = g_list_remove_all (tray_icons_list, tray_data);
    free_tray_icon_data (tray_data);
    tray_data = NULL;

    g_slice_free (struct _tray_msg, msg);
}

static void
tray_list_remove_data (TrayIconData *data)
{
    struct _tray_msg *msg;

    msg = g_slice_new0 (struct _tray_msg);
    msg->header.func = (MessageFunc) tray_list_remove_data_async;
    msg->data = data;

    message_push ((Message *) msg);
}

static void
notify_dialog_cb (AlarmNotifyResult result,
                  gint snooze_mins,
                  gpointer data)
{
    TrayIconData *tray_data = data;

    debug (("Received from dialog"));

    g_signal_handlers_disconnect_matched (
        tray_data->view, G_SIGNAL_MATCH_FUNC,
        0, 0, NULL, on_dialog_objs_removed_cb, NULL);

    switch (result) {
    case ALARM_NOTIFY_SNOOZE:
        debug (("Creating a snooze"));
        create_snooze (tray_data->cqa, tray_data->alarm_id, snooze_mins);
        tray_data->snooze_set = TRUE;
        tray_list_remove_data (tray_data);
        if (alarm_notifications_dialog) {
            GtkTreeSelection *selection =
                gtk_tree_view_get_selection (
                    GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
            GtkTreeIter iter;
            GtkTreeModel *model = NULL;

            /* We can also use tray_data->iter */
            if (gtk_tree_selection_get_selected (selection, &model, &iter)) {
                gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
                tray_data->is_in_tree = FALSE;
                if (!gtk_tree_model_get_iter_first (model, &iter)) {
                    /* We removed the last one */
                    gtk_widget_destroy (alarm_notifications_dialog->dialog);
                    g_free (alarm_notifications_dialog);
                    alarm_notifications_dialog = NULL;
                } else {
                    /* Select the first */
                    gtk_tree_selection_select_iter (selection, &iter);
                }
            }

        }

        break;

    case ALARM_NOTIFY_EDIT:
        edit_component (tray_data->cal_client, tray_data->comp);

        break;

    case ALARM_NOTIFY_PRINT:
        print_component (tray_data->cal_client, tray_data->comp);

        break;

    case ALARM_NOTIFY_DISMISS:
        if (alarm_notifications_dialog && tray_data->is_in_tree) {
            GtkTreeModel *model;

            model = gtk_tree_view_get_model (
                GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
            gtk_list_store_remove (GTK_LIST_STORE (model), &tray_data->iter);
            tray_data->is_in_tree = FALSE;
        }
        break;

    case ALARM_NOTIFY_CLOSE:
        debug (("Dialog close"));
        if (alarm_notifications_dialog) {
            GtkTreeIter iter;
            GtkTreeModel *model =
                gtk_tree_view_get_model (
                    GTK_TREE_VIEW (alarm_notifications_dialog->treeview));
            gboolean valid = gtk_tree_model_get_iter_first (model, &iter);

            /* Maybe we should warn about this first? */
            while (valid) {
                valid = gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
            }

            gtk_widget_destroy (alarm_notifications_dialog->dialog);
            g_free (alarm_notifications_dialog);
            alarm_notifications_dialog = NULL;

            /* Task to remove the tray icons */
            tray_list_remove_icons ();
        }

        break;

    default:
        g_return_if_reached ();
    }

    return;
}

static void
remove_tray_icon (void)
{
    if (tray_blink_id > -1)
        g_source_remove (tray_blink_id);
    tray_blink_id = -1;

    if (tray_icon) {
        gtk_status_icon_set_visible (tray_icon, FALSE);
        g_object_unref (tray_icon);
        tray_icon = NULL;
    }
}

/* Callbacks.  */
static gboolean
open_alarm_dialog (TrayIconData *tray_data)
{
    QueuedAlarm *qa;

    debug (("..."));
    qa = lookup_queued_alarm (tray_data->cqa, tray_data->alarm_id);
    if (qa) {
        gboolean is_first = !alarm_notifications_dialog;

        remove_tray_icon ();

        if (!alarm_notifications_dialog)
            alarm_notifications_dialog = notified_alarms_dialog_new ();

        if (alarm_notifications_dialog) {

            GtkTreeSelection *selection = NULL;

            selection = gtk_tree_view_get_selection (
                GTK_TREE_VIEW (alarm_notifications_dialog->treeview));

            tray_data->iter = add_alarm_to_notified_alarms_dialog (
                alarm_notifications_dialog,
                tray_data->trigger,
                qa->instance->occur_start,
                qa->instance->occur_end,
                e_cal_component_get_vtype (tray_data->comp),
                tray_data->summary,
                tray_data->description,
                tray_data->location,
                notify_dialog_cb, tray_data);

            tray_data->is_in_tree = TRUE;

            if (is_first)
                gtk_tree_selection_select_iter (selection, &tray_data->iter);

            gtk_window_present (GTK_WINDOW (alarm_notifications_dialog->dialog));
        }

    } else {
        remove_tray_icon ();
    }

    return TRUE;
}

static gint
tray_icon_clicked_cb (GtkWidget *widget,
                      GdkEvent *event,
                      gpointer user_data)
{
    if (event->type == GDK_BUTTON_PRESS) {
        guint event_button = 0;

        debug (("left click and %d alarms", g_list_length (tray_icons_list)));

        gdk_event_get_button (event, &event_button);
        if (event_button == 1 && g_list_length (tray_icons_list) > 0) {
            GList *tmp;
            for (tmp = tray_icons_list; tmp; tmp = tmp->next) {
                open_alarm_dialog (tmp->data);
            }

            return TRUE;
        } else if (event_button == 3) {
            debug (("right click"));

            remove_tray_icon ();
            return TRUE;
        }
    }

    return FALSE;
}

static void
icon_activated (GtkStatusIcon *icon)
{
    GdkEvent event;

    event.type = GDK_BUTTON_PRESS;
    event.button.button = 1;
    event.button.time = gtk_get_current_event_time ();

    tray_icon_clicked_cb (NULL, &event, NULL);
}

static void
popup_menu (GtkStatusIcon *icon,
            guint button,
            guint activate_time)
{
    if (button == 3) {
        /* right click */
        GdkEvent event;

        event.type = GDK_BUTTON_PRESS;
        event.button.button = 3;
        event.button.time = gtk_get_current_event_time ();

        tray_icon_clicked_cb (NULL, &event, NULL);
    }
}

static gboolean
tray_icon_blink_cb (gpointer data)
{
    static gboolean tray_blink_state = FALSE;
    const gchar *icon_name;

    tray_blink_countdown--;
    tray_blink_state = !tray_blink_state;

    if (tray_blink_state || tray_blink_countdown <= 0)
        icon_name = "appointment-missed";
    else
        icon_name = "appointment-soon";

    if (tray_icon)
        gtk_status_icon_set_from_icon_name (tray_icon, icon_name);

    if (tray_blink_countdown <= 0)
        tray_blink_id = -1;

    return tray_blink_countdown > 0;
}

/* Add a new data to tray list */

static void
tray_list_add_async (struct _tray_msg *msg)
{
    tray_icons_list = g_list_prepend (tray_icons_list, msg->data);

    g_slice_free (struct _tray_msg, msg);
}

static void
tray_list_add_new (TrayIconData *data)
{
    struct _tray_msg *msg;

    msg = g_slice_new0 (struct _tray_msg);
    msg->header.func = (MessageFunc) tray_list_add_async;
    msg->data = data;

    message_push ((Message *) msg);
}

static void
alarm_queue_get_alarm_summary (ECalClient *cal_client,
                               ECalComponent *comp,
                               const ECalComponentAlarmInstance *instance,
                               ECalComponentText *text,
                               ECalComponentAlarm **palarm)
{
    g_return_if_fail (comp != NULL);
    g_return_if_fail (instance != NULL);
    g_return_if_fail (instance->auid != NULL);
    g_return_if_fail (text != NULL);
    g_return_if_fail (palarm != NULL);

    text->value = NULL;

    if (e_client_check_capability (E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_ALARM_DESCRIPTION)) {
        *palarm = e_cal_component_get_alarm (comp, instance->auid);
        if (*palarm) {
            e_cal_component_alarm_get_description (*palarm, text);
            if (!text->value || !*text->value) {
                text->value = NULL;
                e_cal_component_alarm_free (*palarm);
                *palarm = NULL;
            }
        } else {
            *palarm = NULL;
        }
    }

    if (!text->value)
        e_cal_component_get_summary (comp, text);
}

/* Performs notification of a display alarm */
static void
display_notification (time_t trigger,
                      CompQueuedAlarms *cqa,
                      gpointer alarm_id,
                      gboolean use_description)
{
    QueuedAlarm *qa;
    ECalComponent *comp;
    ECalComponentAlarm *comp_alarm = NULL;
    const gchar *summary, *description, *location;
    TrayIconData *tray_data;
    ECalComponentText text;
    GSList *text_list;
    gchar *str, *start_str, *end_str, *alarm_str, *time_str;
    icaltimezone *current_zone;
    ECalComponentOrganizer organiser;

    debug (("..."));

    comp = cqa->alarms->comp;
    qa = lookup_queued_alarm (cqa, alarm_id);
    if (!qa)
        return;

    /* get a sensible description for the event */
    alarm_queue_get_alarm_summary (cqa->parent_client->cal_client, comp, qa->instance, &text, &comp_alarm);
    e_cal_component_get_organizer (comp, &organiser);

    if (text.value)
        summary = text.value;
    else
        summary = _("No summary available.");

    e_cal_component_get_description_list (comp, &text_list);

    if (text_list) {
        text = *((ECalComponentText *) text_list->data);
        if (text.value)
            description = text.value;
        else
            description = _("No description available.");
    } else {
        description = _("No description available.");
    }

    e_cal_component_free_text_list (text_list);

    e_cal_component_get_location (comp, &location);

    if (!location)
        location = _("No location information available.");

    /* create the tray icon */
    if (tray_icon == NULL) {
        tray_icon = gtk_status_icon_new ();
        gtk_status_icon_set_title (tray_icon, _("Evolution Reminders"));
        gtk_status_icon_set_from_icon_name (
            tray_icon, "appointment-soon");
        g_signal_connect (
            tray_icon, "activate",
            G_CALLBACK (icon_activated), NULL);
        g_signal_connect (
            tray_icon, "popup-menu",
            G_CALLBACK (popup_menu), NULL);
    }

    current_zone = config_data_get_timezone ();
    alarm_str = timet_to_str_with_zone (trigger, current_zone);
    start_str = timet_to_str_with_zone (qa->instance->occur_start, current_zone);
    end_str = timet_to_str_with_zone (qa->instance->occur_end, current_zone);
    time_str = calculate_time (qa->instance->occur_start, qa->instance->occur_end);

    str = g_strdup_printf (
        "%s\n%s %s",
        summary, start_str, time_str);

    /* create the private structure */
    tray_data = g_new0 (TrayIconData, 1);
    tray_data->summary = g_strdup (summary);
    tray_data->description = g_strdup (description);
    tray_data->location = g_strdup (location);
    tray_data->trigger = trigger;
    tray_data->cqa = cqa;
    tray_data->alarm_id = alarm_id;
    tray_data->comp = e_cal_component_clone (comp);
    tray_data->cal_client = cqa->parent_client->cal_client;
    tray_data->view = g_object_ref (cqa->parent_client->view);
    tray_data->blink_state = FALSE;
    tray_data->snooze_set = FALSE;
    tray_data->is_in_tree = FALSE;
    g_object_ref (tray_data->cal_client);

    /* Task to add tray_data to the global tray_icon_list */
    tray_list_add_new (tray_data);

    if (g_list_length (tray_icons_list) > 1) {
        gchar *tip;

        tip =  g_strdup_printf (ngettext (
            "You have %d reminder", "You have %d reminders",
            g_list_length (tray_icons_list)),
            g_list_length (tray_icons_list));
        gtk_status_icon_set_tooltip_text (tray_icon, tip);
    }
    else {
        gtk_status_icon_set_tooltip_text (tray_icon, str);
    }

    if (comp_alarm)
        e_cal_component_alarm_free (comp_alarm);
    g_free (start_str);
    g_free (end_str);
    g_free (alarm_str);
    g_free (time_str);
    g_free (str);

    g_signal_connect (
        tray_data->view, "objects_removed",
        G_CALLBACK (on_dialog_objs_removed_cb), tray_data);

    /* FIXME: We should remove this check */
    if (!config_data_get_notify_with_tray ()) {
        tray_blink_id = -1;
        open_alarm_dialog (tray_data);
        if (alarm_notifications_dialog)
            gtk_window_stick (GTK_WINDOW (
                alarm_notifications_dialog->dialog));
    } else {
        if (tray_blink_id == -1) {
            tray_blink_countdown = 30;
            tray_blink_id = g_timeout_add (500, tray_icon_blink_cb, tray_data);
        }
    }
}

#ifdef HAVE_LIBNOTIFY
static void
popup_notification (time_t trigger,
                    CompQueuedAlarms *cqa,
                    gpointer alarm_id,
                    gboolean use_description)
{
    QueuedAlarm *qa;
    ECalComponent *comp;
    ECalComponentAlarm *comp_alarm = NULL;
    const gchar *summary, *location;
    ECalComponentText text;
    gchar *str, *start_str, *end_str, *alarm_str, *time_str;
    icaltimezone *current_zone;
    ECalComponentOrganizer organiser;
    NotifyNotification *notify;
    gchar *body;

    debug (("..."));

    comp = cqa->alarms->comp;
    qa = lookup_queued_alarm (cqa, alarm_id);
    if (!qa)
        return;
    if (!notify_is_initted ())
        notify_init (_("Evolution Reminders"));

    /* get a sensible description for the event */
    alarm_queue_get_alarm_summary (cqa->parent_client->cal_client, comp, qa->instance, &text, &comp_alarm);
    e_cal_component_get_organizer (comp, &organiser);

    if (text.value)
        summary = text.value;
    else
        summary = _("No summary available.");

    e_cal_component_get_location (comp, &location);

    /* create the tray icon */

    current_zone = config_data_get_timezone ();
    alarm_str = timet_to_str_with_zone (trigger, current_zone);
    start_str = timet_to_str_with_zone (qa->instance->occur_start, current_zone);
    end_str = timet_to_str_with_zone (qa->instance->occur_end, current_zone);
    time_str = calculate_time (qa->instance->occur_start, qa->instance->occur_end);

    str = g_strdup_printf (
        "%s %s",
        start_str, time_str);

    if (organiser.cn) {
        if (location)
            body = g_strdup_printf (
                "<b>%s</b>\n%s %s\n%s %s",
                organiser.cn, _("Location:"),
                location, start_str, time_str);
        else
            body = g_strdup_printf (
                "<b>%s</b>\n%s %s",
                organiser.cn, start_str, time_str);
    }
    else {
        if (location)
            body = g_strdup_printf (
                "%s %s\n%s %s", _("Location:"),
                location, start_str, time_str);
        else
            body = g_strdup_printf (
                "%s %s", start_str, time_str);
    }

    notify = notify_notification_new (summary, body, "appointment-soon");

    /* If the user wants Evolution notifications suppressed, honor
     * it even though evolution-alarm-notify is a separate process
     * with its own .desktop file. */
    notify_notification_set_hint (
        notify, "desktop-entry",
        g_variant_new_string (PACKAGE));

    if (!notify_notification_show (notify, NULL))
        g_warning ("Could not send notification to daemon\n");

    if (comp_alarm)
        e_cal_component_alarm_free (comp_alarm);
    /* create the private structure */
    g_free (start_str);
    g_free (end_str);
    g_free (alarm_str);
    g_free (time_str);
    g_free (str);

}
#endif

/* Performs notification of an audio alarm */
static void
audio_notification (time_t trigger,
                    CompQueuedAlarms *cqa,
                    gpointer alarm_id)
{
    QueuedAlarm *qa;
    ECalComponent *comp;
    ECalComponentAlarm *alarm;
    icalattach *attach;
    gint    flag = 0;

    debug (("..."));

    comp = cqa->alarms->comp;
    qa = lookup_queued_alarm (cqa, alarm_id);
    if (!qa)
        return;

    alarm = e_cal_component_get_alarm (comp, qa->instance->auid);
    g_return_if_fail (alarm != NULL);

    e_cal_component_alarm_get_attach (alarm, &attach);
    e_cal_component_alarm_free (alarm);

    if (attach && icalattach_get_is_url (attach)) {
        const gchar *url;

        url = icalattach_get_url (attach);
        if (url && *url) {
            gchar *filename;
            GError *error = NULL;

            filename = g_filename_from_uri (url, NULL, &error);

            if (error != NULL) {
                g_warning ("%s: %s", G_STRFUNC, error->message);
                g_error_free (error);
            } else if (filename && g_file_test (filename, G_FILE_TEST_EXISTS)) {
#ifdef HAVE_CANBERRA
                flag = 1;
                ca_context_play (
                    ca_gtk_context_get (), 0,
                    CA_PROP_MEDIA_FILENAME, filename, NULL);
#endif
            }

            g_free (filename);
        }
    }

    if (!flag)
        gdk_beep ();

    if (attach)
        icalattach_unref (attach);

}

/* Performs notification of a mail alarm */
static void
mail_notification (time_t trigger,
                   CompQueuedAlarms *cqa,
                   gpointer alarm_id)
{
    if (!e_client_check_capability (
        E_CLIENT (cqa->parent_client->cal_client),
        CAL_STATIC_CAPABILITY_NO_EMAIL_ALARMS))
        return;

    /* FIXME Implement this. */
}

/* Performs notification of a procedure alarm */
static gboolean
procedure_notification_dialog (const gchar *cmd,
                               const gchar *url)
{
    GtkWidget *container;
    GtkWidget *dialog;
    GtkWidget *label;
    GtkWidget *checkbox;
    gchar *str;
    gint btn;

    debug (("..."));

    if (config_data_is_blessed_program (url))
        return TRUE;

    dialog = gtk_dialog_new_with_buttons (
        _("Warning"), NULL, 0,
        GTK_STOCK_NO, GTK_RESPONSE_CANCEL,
        GTK_STOCK_YES, GTK_RESPONSE_OK,
        NULL);

    str = g_strdup_printf (
        _("An Evolution Calendar reminder is about to trigger. "
        "This reminder is configured to run the following program:\n\n"
        "        %s\n\n"
        "Are you sure you want to run this program?"),
        cmd);
    label = gtk_label_new (str);
    gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
    gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
    gtk_widget_show (label);

    container = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
    gtk_box_pack_start (GTK_BOX (container), label, TRUE, TRUE, 4);
    g_free (str);

    checkbox = gtk_check_button_new_with_label
        (_("Do not ask me about this program again."));
    gtk_widget_show (checkbox);
    gtk_box_pack_start (GTK_BOX (container), checkbox, TRUE, TRUE, 4);

    /* Run the dialog */
    btn = gtk_dialog_run (GTK_DIALOG (dialog));
    if (btn == GTK_RESPONSE_OK &&
        gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (checkbox)))
        config_data_save_blessed_program (url);
    gtk_widget_destroy (dialog);

    return (btn == GTK_RESPONSE_OK);
}

static void
procedure_notification (time_t trigger,
                        CompQueuedAlarms *cqa,
                        gpointer alarm_id)
{
    QueuedAlarm *qa;
    ECalComponent *comp;
    ECalComponentAlarm *alarm;
    ECalComponentText description;
    icalattach *attach;
    const gchar *url;
    gchar *cmd;
    gboolean result = TRUE;

    debug (("..."));

    comp = cqa->alarms->comp;
    qa = lookup_queued_alarm (cqa, alarm_id);
    if (!qa)
        return;

    alarm = e_cal_component_get_alarm (comp, qa->instance->auid);
    g_return_if_fail (alarm != NULL);

    e_cal_component_alarm_get_attach (alarm, &attach);
    e_cal_component_alarm_get_description (alarm, &description);
    e_cal_component_alarm_free (alarm);

    /* If the alarm has no attachment, simply display a notification dialog. */
    if (!attach)
        goto fallback;

    if (!icalattach_get_is_url (attach)) {
        icalattach_unref (attach);
        goto fallback;
    }

    url = icalattach_get_url (attach);
    g_return_if_fail (url != NULL);

    /* Ask for confirmation before executing the stuff */
    if (description.value)
        cmd = g_strconcat (url, " ", description.value, NULL);
    else
        cmd = (gchar *) url;

    if (procedure_notification_dialog (cmd, url))
        result = g_spawn_command_line_async (cmd, NULL);

    if (cmd != (gchar *) url)
        g_free (cmd);

    icalattach_unref (attach);

    /* Fall back to display notification if we got an error */
    if (result == FALSE)
        goto fallback;

    return;

 fallback:

    display_notification (trigger, cqa, alarm_id, FALSE);
}

static gboolean
check_midnight_refresh (gpointer user_data)
{
    time_t new_midnight;
    icaltimezone *zone;

    debug (("..."));

    zone = config_data_get_timezone ();
    new_midnight = time_day_end_with_zone (time (NULL), zone);

    if (new_midnight > midnight) {
        struct _midnight_refresh_msg *msg;

        msg = g_slice_new0 (struct _midnight_refresh_msg);
        msg->header.func = (MessageFunc) midnight_refresh_async;
        msg->remove = FALSE;

        message_push ((Message *) msg);
    }

    return TRUE;
}

static gboolean
check_wall_clock_time_changed (gpointer user_data)
{
    static gint64 expected_wall_clock_time = 0;
    gint64 wall_clock_time;

    #define ADD_SECONDS(to, secs) ((to) + ((secs) * 1000000))

    wall_clock_time = g_get_real_time ();

    /* use one second margin */
    if (wall_clock_time > ADD_SECONDS (expected_wall_clock_time, 1) ||
        wall_clock_time < ADD_SECONDS (expected_wall_clock_time, -1)) {
        debug (("Current wall-clock time differs from expected, rescheduling alarms"));
        check_midnight_refresh (NULL);
        alarm_reschedule_timeout ();
    }

    expected_wall_clock_time = ADD_SECONDS (wall_clock_time, 60);

    #undef ADD_SECONDS

    return TRUE;
}

/**
 * alarm_queue_init:
 *
 * Initializes the alarm queueing system.  This should be called near the
 * beginning of the program.
 **/
void
alarm_queue_init (gpointer data)
{
    an = data;
    g_return_if_fail (alarm_queue_inited == FALSE);

    debug (("..."));

    client_alarms_hash = g_hash_table_new (g_direct_hash, g_direct_equal);
    queue_midnight_refresh ();

    if (config_data_get_last_notification_time (NULL) == -1) {
        time_t tmval = time_day_begin (time (NULL));
        debug (("Setting last notification time to %s", e_ctime (&tmval)));
        config_data_set_last_notification_time (NULL, tmval);
    }

    /* install timeout handler (every 30 mins) for not missing the midnight refresh */
    g_timeout_add_seconds (1800, check_midnight_refresh, NULL);

    /* monotonic time doesn't change during hibernation, while the wall clock time does,
     * thus check for wall clock time changes and reschedule alarms when it changes */
    g_timeout_add_seconds (60, check_wall_clock_time_changed, NULL);

#ifdef HAVE_LIBNOTIFY
    notify_init (_("Evolution Reminders"));
#endif

    alarm_queue_inited = TRUE;
}

static gboolean
free_client_alarms_cb (gpointer key,
                       gpointer value,
                       gpointer user_data)
{
    ClientAlarms *ca = value;

    debug (("ca=%p", ca));

    if (ca) {
        remove_client_alarms (ca);
        if (ca->cal_client) {
            debug (("Disconnecting Client"));

            g_signal_handlers_disconnect_matched (
                ca->cal_client, G_SIGNAL_MATCH_DATA,
                0, 0, NULL, NULL, ca);
            g_object_unref (ca->cal_client);
        }

        if (ca->view) {
            debug (("Disconnecting Query"));

            g_signal_handlers_disconnect_matched (
                ca->view, G_SIGNAL_MATCH_DATA,
                0, 0, NULL, NULL, ca);
            g_object_unref (ca->view);
        }

        g_hash_table_destroy (ca->uid_alarms_hash);

        g_free (ca);
        return TRUE;
    }

    return FALSE;
}

/**
 * alarm_queue_done:
 *
 * Shuts down the alarm queueing system.  This should be called near the end
 * of the program.  All the monitored calendar clients should already have been
 * unregistered with alarm_queue_remove_client().
 **/
void
alarm_queue_done (void)
{
    g_return_if_fail (alarm_queue_inited);

    /* All clients must be unregistered by now */
    g_return_if_fail (g_hash_table_size (client_alarms_hash) == 0);

    debug (("..."));

    g_hash_table_foreach_remove (
        client_alarms_hash, (GHRFunc) free_client_alarms_cb, NULL);
    g_hash_table_destroy (client_alarms_hash);
    client_alarms_hash = NULL;

    if (midnight_refresh_id != NULL) {
        alarm_remove (midnight_refresh_id);
        midnight_refresh_id = NULL;
    }

    alarm_queue_inited = FALSE;
}

static gboolean
compare_ids (gpointer a,
             gpointer b)
{
    ECalComponentId *id, *id1;

    id = a;
    id1 = b;
    if (id->uid != NULL && id1->uid != NULL) {
        if (g_str_equal (id->uid, id1->uid)) {

            if (id->rid && id1->rid)
                return g_str_equal (id->rid, id1->rid);
            else if (!(id->rid && id1->rid))
                return TRUE;
        }
    }
    return FALSE;
}

static guint
hash_ids (gpointer a)
{
    ECalComponentId *id =a;

    return g_str_hash (id->uid);
}

struct _alarm_client_msg {
    Message header;
    ECalClient *cal_client;
};

static void
alarm_queue_add_async (struct _alarm_client_msg *msg)
{
    ClientAlarms *ca;
    ECalClient *cal_client = msg->cal_client;

    g_return_if_fail (alarm_queue_inited);
    g_return_if_fail (cal_client != NULL);
    g_return_if_fail (E_IS_CAL_CLIENT (cal_client));

    ca = lookup_client (cal_client);
    if (ca) {
        /* We already have it. Unref the passed one*/
        g_object_unref (cal_client);
        return;
    }

    debug (("client=%p", cal_client));

    ca = g_new (ClientAlarms, 1);

    ca->cal_client = cal_client;
    ca->view = NULL;

    g_hash_table_insert (client_alarms_hash, cal_client, ca);

    ca->uid_alarms_hash = g_hash_table_new (
        (GHashFunc) hash_ids, (GEqualFunc) compare_ids);

    load_alarms_for_today (ca);

    g_slice_free (struct _alarm_client_msg, msg);
}

/**
 * alarm_queue_add_client:
 * @cal_client: A calendar client.
 *
 * Adds a calendar client to the alarm queueing system.  Alarm trigger
 * notifications will be presented at the appropriate times.  The client should
 * be removed with alarm_queue_remove_client() when receiving notifications
 * from it is no longer desired.
 *
 * A client can be added any number of times to the alarm queueing system,
 * but any single alarm trigger will only be presented once for a particular
 * client.  The client must still be removed the same number of times from the
 * queueing system when it is no longer wanted.
 **/
void
alarm_queue_add_client (ECalClient *cal_client)
{
    struct _alarm_client_msg *msg;

    msg = g_slice_new0 (struct _alarm_client_msg);
    msg->header.func = (MessageFunc) alarm_queue_add_async;
    msg->cal_client = g_object_ref (cal_client);

    message_push ((Message *) msg);
}

/* Removes a component an its alarms */
static void
remove_cqa (ClientAlarms *ca,
            ECalComponentId *id,
            CompQueuedAlarms *cqa)
{

    /* If a component is present, then it means we must have alarms queued
     * for it.
     */
    g_return_if_fail (cqa->queued_alarms != NULL);

    debug (("removing %d alarms", g_slist_length (cqa->queued_alarms)));
    remove_alarms (cqa, TRUE);
}

static gboolean
remove_comp_by_id (gpointer key,
                   gpointer value,
                   gpointer userdata)
{

    ClientAlarms *ca = (ClientAlarms *) userdata;

    debug (("..."));

/*  if (!g_hash_table_size (ca->uid_alarms_hash)) */
/*      return; */

    remove_cqa (ca, (ECalComponentId *) key, (CompQueuedAlarms *) value);

    return TRUE;
}

/* Removes all the alarms queued for a particular calendar client */
static void
remove_client_alarms (ClientAlarms *ca)
{
    debug (("size %d", g_hash_table_size (ca->uid_alarms_hash)));

    g_hash_table_foreach_remove  (
        ca->uid_alarms_hash, (GHRFunc) remove_comp_by_id, ca);

    /* The hash table should be empty now */
    g_return_if_fail (g_hash_table_size (ca->uid_alarms_hash) == 0);
}

/**
 * alarm_queue_remove_client:
 * @client: A calendar client.
 *
 * Removes a calendar client from the alarm queueing system.
 **/
static void
alarm_queue_remove_async (struct _alarm_client_msg *msg)
{
    ClientAlarms *ca;
    ECalClient *cal_client = msg->cal_client;

    g_return_if_fail (alarm_queue_inited);
    g_return_if_fail (cal_client != NULL);
    g_return_if_fail (E_IS_CAL_CLIENT (cal_client));

    ca = lookup_client (cal_client);
    g_return_if_fail (ca != NULL);

    debug (("..."));
    remove_client_alarms (ca);

    /* Clean up */
    if (ca->cal_client) {
        debug (("Disconnecting Client"));

        g_signal_handlers_disconnect_matched (
            ca->cal_client, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, ca);
        g_object_unref (ca->cal_client);
        ca->cal_client = NULL;
    }

    if (ca->view) {
        debug (("Disconnecting Query"));

        g_signal_handlers_disconnect_matched (
            ca->view, G_SIGNAL_MATCH_DATA,
            0, 0, NULL, NULL, ca);
        g_object_unref (ca->view);
        ca->view = NULL;
    }

    g_hash_table_destroy (ca->uid_alarms_hash);
    ca->uid_alarms_hash = NULL;

    g_free (ca);

    g_hash_table_remove (client_alarms_hash, cal_client);

    g_slice_free (struct _alarm_client_msg, msg);
}

/** alarm_queue_remove_client
 *
 * asynchronously remove client from alarm queue.
 * @cal_client: Client to remove.
 * @immediately: Indicates whether use thread or do it right now.
 */

void
alarm_queue_remove_client (ECalClient *cal_client,
                           gboolean immediately)
{
    struct _alarm_client_msg *msg;

    msg = g_slice_new0 (struct _alarm_client_msg);
    msg->header.func = (MessageFunc) alarm_queue_remove_async;
    msg->cal_client = cal_client;

    if (immediately) {
        alarm_queue_remove_async (msg);
    } else
        message_push ((Message *) msg);
}

/* Update non-time related variables for various structures on modification
 * of an existing component to be called only from query_objects_changed_cb */
static void
update_cqa (CompQueuedAlarms *cqa,
            ECalComponent *newcomp)
{
    ECalComponent *oldcomp;
    ECalComponentAlarms *alarms = NULL;
    GSList *qa_list;    /* List of current QueuedAlarms corresponding to cqa */
    time_t from, to;
    icaltimezone *zone;
    ECalComponentAlarmAction omit[] = {-1};

    oldcomp = cqa->alarms->comp;

    zone = config_data_get_timezone ();
    from = time_day_begin_with_zone (time (NULL), zone);
    to = time_day_end_with_zone (time (NULL), zone);

    debug (("Generating alarms between %s and %s", e_ctime (&from), e_ctime (&to)));
    alarms = e_cal_util_generate_alarms_for_comp (
        newcomp, from, to, omit, e_cal_client_resolve_tzid_cb,
        cqa->parent_client->cal_client, zone);

    /* Update auids in Queued Alarms*/
    for (qa_list = cqa->queued_alarms; qa_list; qa_list = qa_list->next) {
        QueuedAlarm *qa = qa_list->data;
        gchar *check_auid = (gchar *) qa->instance->auid;
        ECalComponentAlarm *alarm;

        alarm = e_cal_component_get_alarm (newcomp, check_auid);
        if (alarm) {
            e_cal_component_alarm_free (alarm);
            continue;
        } else {
            alarm = e_cal_component_get_alarm (oldcomp, check_auid);
            if (alarm) { /* Need to update QueuedAlarms */
                e_cal_component_alarm_free (alarm);
                if (alarms == NULL) {
                    debug (("No alarms found in the modified component"));
                    break;
                }
                update_qa (alarms, qa);
            }
            else
                g_warning ("Failed in auid lookup for old component also\n");
        }
    }

    /* Update the actual component stored in CompQueuedAlarms structure */
    g_object_unref (cqa->alarms->comp);
    cqa->alarms->comp = newcomp;
    if (alarms != NULL)
        e_cal_component_alarms_free (alarms);
}

static void
update_qa (ECalComponentAlarms *alarms,
           QueuedAlarm *qa)
{
    ECalComponentAlarmInstance *al_inst;
    GSList *instance_list;

    debug (("..."));
    for (instance_list = alarms->alarms;
         instance_list;
         instance_list = instance_list->next) {
        al_inst = instance_list->data;
        /* FIXME If two or more alarm instances (audio, note)
         *       for same component have same trigger... */
        if (al_inst->trigger == qa->orig_trigger) {
            g_free ((gchar *) qa->instance->auid);
            qa->instance->auid = g_strdup (al_inst->auid);
            break;
        }
    }
}