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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2007 Collabora Ltd.
 *
 * 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.
 * 
 * Authors: Xavier Claessens <xclaesse@gmail.com>
 */

#include <config.h>

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

#include <libtelepathy/tp-helpers.h>

#include <libmissioncontrol/mission-control.h>

#include "empathy-idle.h"
#include "gossip-utils.h" 
#include "gossip-debug.h"

#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
               EMPATHY_TYPE_IDLE, EmpathyIdlePriv))

#define DEBUG_DOMAIN "Idle"

/* Number of seconds before entering extended autoaway. */
#define EXT_AWAY_TIME (30*60)

enum {
    LAST_SIGNAL
};

struct _EmpathyIdlePriv {
    MissionControl *mc;
    DBusGProxy     *gs_proxy;
    gboolean        is_idle;
    McPresence      saved_state;
    gchar          *saved_status;
    guint           ext_away_timeout;
};

static void     empathy_idle_class_init      (EmpathyIdleClass *klass);
static void     empathy_idle_init            (EmpathyIdle      *idle);
static void     idle_finalize                (GObject          *object);
static void     idle_session_idle_changed_cb (DBusGProxy       *gs_proxy,
                          gboolean          is_idle,
                          EmpathyIdle      *idle);
static void     idle_ext_away_start          (EmpathyIdle      *idle);
static void     idle_ext_away_stop           (EmpathyIdle      *idle);
static gboolean idle_ext_away_cb             (EmpathyIdle      *idle);

//static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE (EmpathyIdle, empathy_idle, G_TYPE_OBJECT)

static void
empathy_idle_class_init (EmpathyIdleClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->finalize = idle_finalize;

    g_type_class_add_private (object_class, sizeof (EmpathyIdlePriv));
}

static void
empathy_idle_init (EmpathyIdle *idle)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (idle);

    priv->is_idle = FALSE;
    priv->mc = gossip_mission_control_new ();
    priv->gs_proxy = dbus_g_proxy_new_for_name (tp_get_bus (),
                            "org.gnome.ScreenSaver",
                            "/org/gnome/ScreenSaver",
                            "org.gnome.ScreenSaver");
    if (!priv->gs_proxy) {
        gossip_debug (DEBUG_DOMAIN, "Failed to get gs proxy");
        return;
    }

    dbus_g_proxy_add_signal (priv->gs_proxy, "SessionIdleChanged",
                 G_TYPE_BOOLEAN,
                 G_TYPE_INVALID);
    dbus_g_proxy_connect_signal (priv->gs_proxy, "SessionIdleChanged",
                     G_CALLBACK (idle_session_idle_changed_cb),
                     idle, NULL);
}

static void
idle_finalize (GObject *object)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (object);

    g_free (priv->saved_status);
    g_object_unref (priv->mc);

    if (priv->gs_proxy) {
        g_object_unref (priv->gs_proxy);
    }

    idle_ext_away_stop (EMPATHY_IDLE (object));
}

EmpathyIdle *
empathy_idle_new (void)
{
    static EmpathyIdle *idle = NULL;

    if (!idle) {
        idle = g_object_new (EMPATHY_TYPE_IDLE, NULL);
        g_object_add_weak_pointer (G_OBJECT (idle), (gpointer) &idle);
    } else {
        g_object_ref (idle);
    }

    return idle;
}

static void
idle_session_idle_changed_cb (DBusGProxy  *gs_proxy,
                  gboolean     is_idle,
                  EmpathyIdle *idle)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (idle);

    gossip_debug (DEBUG_DOMAIN, "Session idle state changed, %s -> %s",
              priv->is_idle ? "yes" : "no",
              is_idle ? "yes" : "no");

    if (is_idle && !priv->is_idle) {
        McPresence new_state = MC_PRESENCE_AWAY;
        /* We are now idle, set state to away */

        priv->saved_state = mission_control_get_presence_actual (priv->mc, NULL);

        if (priv->saved_state <= MC_PRESENCE_OFFLINE ||
            priv->saved_state == MC_PRESENCE_HIDDEN) {
            /* We are not online so nothing to do here */
            return;
        } else if (priv->saved_state == MC_PRESENCE_AWAY ||
               priv->saved_state == MC_PRESENCE_EXTENDED_AWAY) {
            /* User set away manually, when coming back we restore
             * default presence. */
            new_state = priv->saved_state;
            priv->saved_state = MC_PRESENCE_AVAILABLE;
            priv->saved_status = NULL;
        }

        priv->saved_status = mission_control_get_presence_message_actual (priv->mc, NULL);

        gossip_debug (DEBUG_DOMAIN, "Going to autoaway");
        mission_control_set_presence (priv->mc,
                          new_state,
                          priv->saved_status,
                          NULL, NULL);
        idle_ext_away_start (idle);
    } else if (!is_idle && priv->is_idle) {
        /* We are no more idle, restore state */
        idle_ext_away_stop (idle);

        gossip_debug (DEBUG_DOMAIN, "Restoring state to %d %s",
                  priv->saved_state,
                  priv->saved_status);

        mission_control_set_presence (priv->mc,
                          priv->saved_state,
                          priv->saved_status,
                          NULL, NULL);
        g_free (priv->saved_status);
        priv->saved_status = NULL;
    }

    priv->is_idle = is_idle;
}

static void
idle_ext_away_start (EmpathyIdle *idle)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (idle);

    idle_ext_away_stop (idle);
    priv->ext_away_timeout = g_timeout_add (EXT_AWAY_TIME * 1000,
                        (GSourceFunc) idle_ext_away_cb,
                        idle);
}

static void
idle_ext_away_stop (EmpathyIdle *idle)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (idle);

    if (priv->ext_away_timeout) {
        g_source_remove (priv->ext_away_timeout);
        priv->ext_away_timeout = 0;
    }
}

static gboolean
idle_ext_away_cb (EmpathyIdle *idle)
{
    EmpathyIdlePriv *priv;

    priv = GET_PRIV (idle);

    gossip_debug (DEBUG_DOMAIN, "Going to extended autoaway");
    mission_control_set_presence (priv->mc,
                      MC_PRESENCE_EXTENDED_AWAY,
                      priv->saved_status,
                      NULL, NULL);

    priv->ext_away_timeout = 0;

    return FALSE;
}