/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
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** License version 2.1 as published by the Free Software Foundation and
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** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
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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.
**
** 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
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** file. Please review the following information to ensure the GNU General
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** $QT_END_LICENSE$
**
****************************************************************************/


#include "qhoversensorgesturerecognizer.h"
QT_BEGIN_NAMESPACE

QHoverSensorGestureRecognizer::QHoverSensorGestureRecognizer(QObject *parent) :
    QSensorGestureRecognizer(parent),
    hoverOk(0), lastLightReading(0), detecting(0)
{
}

QHoverSensorGestureRecognizer::~QHoverSensorGestureRecognizer()
{
}

void QHoverSensorGestureRecognizer::create()
{
    light = new QLightSensor(this);
    light->connectToBackend();

    timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(timeout()));
    timer->setSingleShot(true);
    timer->setInterval(1000);

    timer2 = new QTimer(this);
    connect(timer2,SIGNAL(timeout()),this,SLOT(timeout2()));
    timer2->setSingleShot(true);
    timer2->setInterval(3000);
}

QString QHoverSensorGestureRecognizer::id() const
{
    return QString("QtSensors.hover");
}

bool QHoverSensorGestureRecognizer::start()
{
    connect(light,SIGNAL(readingChanged()), this,SLOT(lightChanged()));
    light->start();
    return light->isActive();
}

bool QHoverSensorGestureRecognizer::stop()
{
   light->stop();
   disconnect(light,SIGNAL(readingChanged()),this,SLOT(lightChanged()));
   return light->isActive();
}

bool QHoverSensorGestureRecognizer::isActive()
{
    return light->isActive();
}

void QHoverSensorGestureRecognizer::lightChanged()
{
    qreal lightReading = light->reading()->lux();

    int difference = 100 - (lightReading/lastLightReading) * 100;

    if (difference == 0) {
        return;
    }

    if (!detecting && difference > 19) {
//        if (lightReading < lastLightReading ) {
        detecting = true;
        timer->start();
        timer2->start();
    } else if (hoverOk && detecting && difference < -24) {
        // went light again after 1 seconds
//            qDebug() << "hover";
            Q_EMIT hover();
            Q_EMIT detected("hover");
            hoverOk = false;
            detecting = false;
    }
    lastLightReading = lightReading;
}

void QHoverSensorGestureRecognizer::timeout()
{
    hoverOk = true;
}


void QHoverSensorGestureRecognizer::timeout2()
{
    detecting = false;
}
QT_END_NAMESPACE