/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qcoversensorgesturerecognizer.h"
#include "qtsensorgesturesensorhandler.h"

QT_BEGIN_NAMESPACE

QCoverSensorGestureRecognizer::QCoverSensorGestureRecognizer(QObject *parent)
    : QSensorGestureRecognizer(parent),
      orientationReading(0),
      proximityReading(0),
      timer(0),
      active(0),
      detecting(0)
{
}

QCoverSensorGestureRecognizer::~QCoverSensorGestureRecognizer()
{
}

void QCoverSensorGestureRecognizer::create()
{
    timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(timeout()));
    timer->setSingleShot(true);
    timer->setInterval(750);
}

QString QCoverSensorGestureRecognizer::id() const
{
    return QString("QtSensors.cover");
}

bool QCoverSensorGestureRecognizer::start()
{
    if (QtSensorGestureSensorHandler::instance()->startSensor(QtSensorGestureSensorHandler::Proximity)) {
        if (QtSensorGestureSensorHandler::instance()->startSensor(QtSensorGestureSensorHandler::Orientation)) {
            active = true;
            connect(QtSensorGestureSensorHandler::instance(),SIGNAL(proximityReadingChanged(QProximityReading*)),
                    this,SLOT(proximityChanged(QProximityReading*)));

            connect(QtSensorGestureSensorHandler::instance(),SIGNAL(orientationReadingChanged(QOrientationReading*)),
                    this,SLOT(orientationReadingChanged(QOrientationReading*)));
        } else {
            QtSensorGestureSensorHandler::instance()->stopSensor(QtSensorGestureSensorHandler::Proximity);
            active = false;
        }
    } else {
        active = false;
    }
    return active;
}

bool QCoverSensorGestureRecognizer::stop()
{
    QtSensorGestureSensorHandler::instance()->stopSensor(QtSensorGestureSensorHandler::Proximity);
    QtSensorGestureSensorHandler::instance()->stopSensor(QtSensorGestureSensorHandler::Orientation);

    disconnect(QtSensorGestureSensorHandler::instance(),SIGNAL(proximityReadingChanged(QProximityReading*)),
               this,SLOT(proximityChanged(QProximityReading*)));
    disconnect(QtSensorGestureSensorHandler::instance(),SIGNAL(orientationReadingChanged(QOrientationReading*)),
               this,SLOT(orientationReadingChanged(QOrientationReading*)));

    active = false;
    timer->stop();
    return active;
}

bool QCoverSensorGestureRecognizer::isActive()
{
    return active;
}

void QCoverSensorGestureRecognizer::proximityChanged(QProximityReading *reading)
{
    if (orientationReading == 0)
        return;

    proximityReading = reading->close();

    // look at case of face up->face down->face up.
    if (orientationReading->orientation() ==  QOrientationReading::FaceUp
            && proximityReading) {
        if (!timer->isActive()) {
            timer->start();
            detecting = true;
        }
    }
}

void QCoverSensorGestureRecognizer::orientationReadingChanged(QOrientationReading *reading)
{
    orientationReading = reading;
}

void QCoverSensorGestureRecognizer::timeout()
{
    if ((orientationReading->orientation() == QOrientationReading::FaceUp)
            && proximityReading) {
        Q_EMIT cover();
        Q_EMIT detected("cover");
        detecting = false;
    }
}

QT_END_NAMESPACE
