/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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(":/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);
            }
        }
    }
}

QGeoPositionInfoSource::Error LogFilePositionSource::error() const
{
    return QGeoPositionInfoSource::NoError;
}