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#include <QtCore>

#include "logfilepositionsource.h"

LogFilePositionSource::LogFilePositionSource(QObject *parent)

    : QGeoPositionInfoSource(parent),

      logFile(new QFile(this)),

      timer(new QTimer(this))

{

    connect(timer, SIGNAL(timeout()), this, SLOT(readNextPosition()));

    logFile->setFileName(QCoreApplication::applicationDirPath()

            + QDir::separator() + "simplelog.txt");

    if (!logFile->open(QIODevice::ReadOnly))

        qWarning() << "Error: cannot open source file" << logFile->fileName();

}

QGeoPositionInfo LogFilePositionSource::lastKnownPosition(bool /*fromSatellitePositioningMethodsOnly*/) const

{

    return lastPosition;

}

LogFilePositionSource::PositioningMethods LogFilePositionSource::supportedPositioningMethods() const

{

    return AllPositioningMethods;

}

int LogFilePositionSource::minimumUpdateInterval() const

{

    return 500;

}

void LogFilePositionSource::startUpdates()

{

    int interval = updateInterval();

    if (interval < minimumUpdateInterval())

        interval = minimumUpdateInterval();

    timer->start(interval);

}

void LogFilePositionSource::stopUpdates()

{

    timer->stop();

}

void LogFilePositionSource::requestUpdate(int /*timeout*/)

{

    // For simplicity, ignore timeout - assume that if data is not available

    // now, no data will be added to the file later

    if (logFile->canReadLine())

        readNextPosition();

    else

        emit updateTimeout();

}

void LogFilePositionSource::readNextPosition()

{

    QByteArray line = logFile->readLine().trimmed();

    if (!line.isEmpty()) {

        QList<QByteArray> data = line.split(' ');

        double latitude;

        double longitude;

        bool hasLatitude = false;

        bool hasLongitude = false;

        QDateTime timestamp = QDateTime::fromString(QString(data.value(0)), Qt::ISODate);

        latitude = data.value(1).toDouble(&hasLatitude);

        longitude = data.value(2).toDouble(&hasLongitude);

        if (hasLatitude && hasLongitude && timestamp.isValid()) {

            QGeoCoordinate coordinate(latitude, longitude);

            QGeoPositionInfo info(coordinate, timestamp);

            if (info.isValid()) {

                lastPosition = info;

                emit positionUpdated(info);

            }

        }

    }

}