/*
 *   Copyright 2007 Aaron Seigo <aseigo@kde.org>
 *   Copyright 2008 Alex Merry <alex.merry@kdemail.net>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 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 Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "timeengine.h"

#include <QDBusConnection>
#include <QStringList>
#include <QDateTime>
#include <KLocale>
#include <KSystemTimeZones>
#include <Solid/PowerManagement>
#include <KDebug>

#include "timesource.h"

TimeEngine::TimeEngine(QObject *parent, const QVariantList &args)
    : Plasma::DataEngine(parent, args)
{
    Q_UNUSED(args)
    setMinimumPollingInterval(333);

    // To have translated timezone names
    // (effectively a noop if the catalog is already present).
    KGlobal::locale()->insertCatalog("timezones4");
}

TimeEngine::~TimeEngine()
{
}

void TimeEngine::init()
{
    QDBusConnection dbus = QDBusConnection::sessionBus();
    dbus.connect(QString(), "/org/kde/kcmshell_clock", "org.kde.kcmshell_clock", "clockUpdated", this, SLOT(clockSkewed()));

    connect(Solid::PowerManagement::notifier(), SIGNAL(resumingFromSuspend()), this , SLOT(clockSkewed()));

    m_tz = KSystemTimeZones::local().name();
    QTimer::singleShot(3000, this, SLOT(checkTZ()));
}

void TimeEngine::clockSkewed()
{
    kDebug() << "Time engine Clock skew signaled";
    updateAllSources();
    forceImmediateUpdateOfAllVisualizations();
}

void TimeEngine::checkTZ()
{
    const QString localtz = KSystemTimeZones::local().name();
    if (localtz != m_tz) {
        m_tz = localtz;

        TimeSource *s = qobject_cast<TimeSource *>(containerForSource("Local"));

        if (s) {
            s->setTimeZone("Local");
        }

        updateAllSources();
    }
    QTimer::singleShot(3000, this, SLOT(checkTZ()));
}

QStringList TimeEngine::sources() const
{
    const KTimeZoneList timezones = KSystemTimeZones::zones();
    QStringList timezonenames;
    timezonenames.reserve(timezones.size());
    foreach (const KTimeZone &zone, timezones) {
        timezonenames.append(zone.name());
    }
    timezonenames << QString::fromLatin1("Local");
    return timezonenames;
}

bool TimeEngine::sourceRequestEvent(const QString &name)
{
    addSource(new TimeSource(name, this));
    return true;
}

bool TimeEngine::updateSourceEvent(const QString &tz)
{
    TimeSource *s = qobject_cast<TimeSource *>(containerForSource(tz));

    if (s) {
        s->updateTime();
        scheduleSourcesUpdated();
        return true;
    }

    return false;
}

K_EXPORT_PLASMA_DATAENGINE(time, TimeEngine)

#include "moc_timeengine.cpp"