/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtLocation module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
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** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qgeoareamonitor_polling_p.h"
#include "qgeocoordinate.h"

#include <QtCore/qmetaobject.h>

QT_BEGIN_NAMESPACE

#define UPDATE_INTERVAL_5S  5000

QGeoAreaMonitorPolling::QGeoAreaMonitorPolling(QObject *parent) : QGeoAreaMonitor(parent)
{
    insideArea = false;
    location = QGeoPositionInfoSource::createDefaultSource(this);
    if (location) {
        location->setUpdateInterval(UPDATE_INTERVAL_5S);
        connect(location, SIGNAL(positionUpdated(QGeoPositionInfo)),
                this, SLOT(positionUpdated(QGeoPositionInfo)));
    }
}

QGeoAreaMonitorPolling::~QGeoAreaMonitorPolling()
{
    if (location)
        location->stopUpdates();
}

void QGeoAreaMonitorPolling::setCenter(const QGeoCoordinate &coordinate)
{
    if (coordinate.isValid()) {
        QGeoAreaMonitor::setCenter(coordinate);
        checkStartStop();
    }
}

void QGeoAreaMonitorPolling::setRadius(qreal radius)
{
    QGeoAreaMonitor::setRadius(radius);
    checkStartStop();
}

static QMetaMethod areaEnteredSignal()
{
    static QMetaMethod signal = QMetaMethod::fromSignal(&QGeoAreaMonitorPolling::areaEntered);
    return signal;
}

static QMetaMethod areaExitedSignal()
{
    static QMetaMethod signal = QMetaMethod::fromSignal(&QGeoAreaMonitorPolling::areaExited);
    return signal;
}

void QGeoAreaMonitorPolling::connectNotify(const QMetaMethod &signal)
{
    if (signal == areaEnteredSignal() ||
            signal == areaExitedSignal())
        checkStartStop();
}

void QGeoAreaMonitorPolling::disconnectNotify(const QMetaMethod &signal)
{
    if (signal == areaEnteredSignal() ||
            signal == areaExitedSignal())
        checkStartStop();
}

void QGeoAreaMonitorPolling::checkStartStop()
{
    if (!location) return;

    if ((isSignalConnected(areaEnteredSignal()) ||
            isSignalConnected(areaExitedSignal())) &&
            QGeoAreaMonitor::center().isValid() &&
            QGeoAreaMonitor::radius() > qreal(0.0)) {
        location->startUpdates();
    } else {
        location->stopUpdates();
    }
}

void QGeoAreaMonitorPolling::positionUpdated(const QGeoPositionInfo &info)
{
    double distance = info.coordinate().distanceTo(QGeoAreaMonitor::center());

    if (distance <= QGeoAreaMonitor::radius()) {
        if (!insideArea)
            emit areaEntered(info);
        insideArea = true;
    } else if (insideArea) {
        emit areaExited(info);
        insideArea = false;
    }
}

#include "moc_qgeoareamonitor_polling_p.cpp"
QT_END_NAMESPACE