4853788370

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github

Committed by Alexander V. Wolf

Commit Message

Special patch for John Simple

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/src/core/StelLocationMgr.cpp

/*
 * Copyright (C) 2008 Fabien Chereau
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335, USA.
 */

#include "StelLocationMgr.hpp"
#include "StelLocationMgr_p.hpp"

#include "StelApp.hpp"
#include "StelCore.hpp"
#include "StelFileMgr.hpp"
#include "StelUtils.hpp"
#include "StelJsonParser.hpp"

#include <QStringListModel>
#include <QDebug>
#include <QFile>
#include <QDir>
#include <QNetworkInterface>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QUrl>
#include <QUrlQuery>
#include <QSettings>
#include <QTimeZone>
#include <QTimer>
#include <QApplication>
#include <QRegularExpression>

TimezoneNameMap StelLocationMgr::locationDBToIANAtranslations;
QString StelLocationMgr::tzfFileName = "data/timezone.tab";
QList<GeoRegion> StelLocationMgr::regions;
QMap<QString, QString> StelLocationMgr::countryCodeToRegionMap;
QMap<QString, QString> StelLocationMgr::countryNameToCodeMap;
bool StelLocationMgr::unknownTZ = false;

#ifdef ENABLE_GPS
#ifdef ENABLE_LIBGPS
LibGPSLookupHelper::LibGPSLookupHelper(QObject *parent)
        : GPSLookupHelper(parent), ready(false)
{
        QSettings* conf = StelApp::getInstance().getSettings();

        QString gpsdHostname=conf->value("gui/gpsd_hostname", "localhost").toString();
        QString gpsdPort=conf->value("gui/gpsd_port", DEFAULT_GPSD_PORT).toString();

        timer.setSingleShot(false);
        if (qApp->property("verbose").toBool())
                qDebug() << "Opening GPSD connection to" << gpsdHostname << ":" << gpsdPort;
        // Example almost straight from http://www.catb.org/gpsd/client-howto.html
        gps_rec = new gpsmm(gpsdHostname.toUtf8(), gpsdPort.toUtf8());
        if(gps_rec->is_open())
        {
                ready = gps_rec->stream(WATCH_ENABLE|WATCH_JSON);
        }
        if(ready)
        {
                connect(&timer, SIGNAL(timeout()), this, SLOT(query()));
        }
        else
                qWarning()<<"libGPS lookup not ready, GPSD probably not running.";
}

LibGPSLookupHelper::~LibGPSLookupHelper()
{
        delete gps_rec;
}

bool LibGPSLookupHelper::isReady()
{
        return ready;
}

void LibGPSLookupHelper::setPeriodicQuery(int interval)
{
        if (interval==0)
                timer.stop();
        else
                {
                        timer.start(interval);
                }
}
void LibGPSLookupHelper::query()
{
        bool verbose=qApp->property("verbose").toBool();

        if(!ready)
        {
                emit queryError("GPSD helper not ready");
                return;
        }

        StelLocation loc;

        int tries=0;
        int fixmode=0;
        while (tries<10)
        {
                tries++;
                if (verbose)
                        qDebug() << "query(): tries=" << tries;

                if (!gps_rec->waiting(750000)) // argument usec. wait 0.75 sec. (example had 50s)
                {
                        qDebug() << " - waiting timed out after 0.75sec.";
                        continue;
                }

                struct gps_data_t* newdata;
                if ((newdata = gps_rec->read()) == Q_NULLPTR)
                {
                        emit queryError("GPSD query: Read error.");
                        return;
                }
                else
                {
// It is unclear why some data elements seem to be not filled by gps_rec.read().
//                        if (newdata->status==0) // no fix?
//                        {
//                                // This can happen indoors.
//                                qDebug() << "GPS has no fix.";
//                                emit queryError("GPSD query: No Fix.");
//                                return;
//                        }
#if GPSD_API_MAJOR_VERSION < 9
                        if (newdata->online==0.0) // no device?
#else
                        if (newdata->online.tv_sec == 0 && newdata->online.tv_nsec == 0) // no device?
#endif
                        {
                                // This can happen when unplugging the GPS while running Stellarium,
                                // or running gpsd with no GPS receiver.
                                emit queryError("GPS seems offline. No fix.");
                                return;
                        }


                        fixmode=newdata->fix.mode; // 0:not_seen, 1:no_fix, 2:2Dfix(no alt), 3:3Dfix(perfect)
                        if (verbose)
                                qDebug() << "GPSD newdata->fix.mode=" << fixmode;

                        if (fixmode==0)
                        {
                                // This may come just after creation of the GPSDhelper.
                                // It seems to take some time to fill the data.
                                if (verbose)
                                        qDebug() << "GPSD seems not ready yet. Retry.";
                                continue;
                        }

                        if (verbose)
                        {
                                //qDebug() << "newdata->online=" << newdata->online;
                                qDebug() << "Solution from " << newdata->satellites_used << "out of " << newdata->satellites_visible << " visible Satellites.";
                                dop_t dop=newdata->dop;
#if GPSD_API_MAJOR_VERSION < 9
                                qDebug() << "GPSD data: Long" << newdata->fix.longitude << "Lat" << newdata->fix.latitude << "Alt" << newdata->fix.altitude;
#else
                                qDebug() << "GPSD data: Long" << newdata->fix.longitude << "Lat" << newdata->fix.latitude << "Alt" << newdata->fix.altHAE;
#endif
                                qDebug() << "Dilution of Precision:";
                                qDebug() << " - xdop:" << dop.xdop << "ydop:" << dop.ydop;
                                qDebug() << " - pdop:" << dop.pdop << "hdop:" << dop.hdop;
                                qDebug() << " - vdop:" << dop.vdop << "tdop:" << dop.tdop << "gdop:" << dop.gdop;
                                // GPSD API 8.0:
                                // * Remove epe from gps_data_t, it duplicates gps_fix_t eph
                                // * Added sep (estimated spherical error, 3D)
                                // Details: https://github.com/Stellarium/stellarium/issues/733
                                // #if GPSD_API_MAJOR_VERSION >= 8
                                // qDebug() << "Spherical Position Error (sep):" << newdata->fix.sep;
                                // #else
                                // qDebug() << "Spherical Position Error (epe):" << newdata->epe;
                                // #endif
                        }
                        loc.setLongitude(static_cast<float> (newdata->fix.longitude));
                        loc.setLatitude (static_cast<float> (newdata->fix.latitude));
                        // Frequently hdop, vdop and satellite counts are NaN. Sometimes they show OK. This is minor issue.
                        if ((verbose) && (fixmode<3))
                        {
                                qDebug() << "GPSDfix " << fixmode << ": Location" << QString("lat %1, long %2, alt %3").arg(loc.getLatitude()).arg(loc.getLongitude()).arg(loc.altitude);
                                qDebug() << "    Estimated HDOP " << newdata->dop.hdop << "m from " << newdata->satellites_used << "(of" << newdata->satellites_visible  << "visible) satellites";
                        }
                        else
                        {
#if GPSD_API_MAJOR_VERSION < 9
                                loc.altitude=static_cast<int>(newdata->fix.altitude);
#else
                                loc.altitude=static_cast<int>(newdata->fix.altHAE);
#endif
                                if (verbose)
                                {
                                        qDebug() << "GPSDfix " << fixmode << ": Location" << QString("lat %1, long %2, alt %3").arg(loc.getLatitude()).arg(loc.getLongitude()).arg(loc.altitude);
                                        qDebug() << "    Estimated HDOP " << newdata->dop.hdop << "m, VDOP " << newdata->dop.vdop <<  "m from " << newdata->satellites_used << "(of" << newdata->satellites_visible  << "visible) satellites";
                                }
                                break; // escape from the tries loop
                        }
                }
        }

        if (fixmode <2)
        {
                emit queryError("GPSD: Could not get valid position.");
                return;
        }
        if ((verbose) && (fixmode<3))
        {
                qDebug() << "Fix only quality " << fixmode << " after " << tries << " tries";
        }
        if (verbose)
                qDebug() << "GPSD location" << QString("lat %1, long %2, alt %3").arg(loc.getLatitude()).arg(loc.getLongitude()).arg(loc.altitude);

        emit queryFinished(loc);
}

#endif

NMEALookupHelper::NMEALookupHelper(QObject *parent)
        : GPSLookupHelper(parent), serial(Q_NULLPTR), nmea(Q_NULLPTR)
{
        //use RAII
        // Getting a list of ports may enable auto-detection!
        QList<QSerialPortInfo> portInfoList=QSerialPortInfo::availablePorts();

        if (portInfoList.size()==0)
        {
                qDebug() << "No connected devices found. NMEA GPS lookup failed.";
                return;
        }

        QSettings* conf = StelApp::getInstance().getSettings();

        // As long as we only have one, this is OK. Else we must do something about COM3, COM4 etc.
        QSerialPortInfo portInfo;
        if (portInfoList.size()==1)
        {
                portInfo=portInfoList.at(0);
                qDebug() << "Only one port found at " << portInfo.portName();
        }
        else
        {
                #ifdef Q_OS_WIN
                QString portName=conf->value("gui/gps_interface", "COM3").toString();
                #else
                QString portName=conf->value("gui/gps_interface", "ttyUSB0").toString();
                #endif
                bool portFound=false;
                for (int i=0; i<portInfoList.size(); ++i)
                {
                        QSerialPortInfo pi=portInfoList.at(i);
                        qDebug() << "Serial port list. Make sure you are using the right configuration.";
                        qDebug() << "Port: " << pi.portName();
                        qDebug() << "  SystemLocation:" << pi.systemLocation();
                        qDebug() << "  Description:"    << pi.description();
                        qDebug() << "  Manufacturer:"   << pi.manufacturer();
                        qDebug() << "  VendorID:"       << pi.vendorIdentifier();
                        qDebug() << "  ProductID:"      << pi.productIdentifier();
                        qDebug() << "  SerialNumber:"   << pi.serialNumber();
#if (QT_VERSION<QT_VERSION_CHECK(5,14,0))
                        qDebug() << "  Busy:"           << pi.isBusy();
#endif
                        qDebug() << "  Null:"           << pi.isNull();
                        if (pi.portName()==portName)
                        {
                                portInfo=pi;
                                portFound=true;
                        }
                }
                if (!portFound)
                {
                        qDebug() << "Configured port" << portName << "not found. No GPS query.";
                        return;
                }
        }

        // NMEA-0183 specifies device sends at 4800bps, 8N1. Some devices however send at 9600, allow this.
        // baudrate is configurable via config
        qint32 baudrate=conf->value("gui/gps_baudrate", 4800).toInt();

        nmea=new QNmeaPositionInfoSource(QNmeaPositionInfoSource::RealTimeMode,this);
        //serial = new QSerialPort(portInfo, nmea);
        serial = new QSerialPort(portInfo, this);
        serial->setBaudRate(baudrate);
        serial->setDataBits(QSerialPort::Data8);
        serial->setParity(QSerialPort::NoParity);
        serial->setStopBits(QSerialPort::OneStop);
        serial->setFlowControl(QSerialPort::NoFlowControl);
        if (serial->open(QIODevice::ReadOnly)) // may fail when line used by other program!
        {
                nmea->setDevice(serial);
                qDebug() << "Query GPS NMEA device at port " << serial->portName();
                connect(nmea, SIGNAL(positionUpdated(const QGeoPositionInfo)),this,SLOT(nmeaUpdated(const QGeoPositionInfo)));
                #if (QT_VERSION>=QT_VERSION_CHECK(6,0,0))
                connect(nmea, SIGNAL(errorOccurred(QGeoPositionInfoSource::Error)), this, SLOT(nmeaError(QGeoPositionInfoSource::Error)));
                #else
                connect(nmea, SIGNAL(error(QGeoPositionInfoSource::Error)), this, SLOT(nmeaError(QGeoPositionInfoSource::Error)));
                connect(nmea, SIGNAL(updateTimeout()),this,SLOT(nmeaTimeout()));
                #endif
        }
        else qWarning() << "Cannot open serial port to NMEA device at port " << serial->portName();
        // This may leave an un-ready object. Must be cleaned-up later.
}
NMEALookupHelper::~NMEALookupHelper()
{
        if(nmea)
        {
                delete nmea;
                nmea=Q_NULLPTR;
        }
        if (serial)
        {
                if (serial->isOpen())
                {
                        //qDebug() << "NMEALookupHelper destructor: Close serial first";
                        serial->clear();
                        serial->close();
                }
                delete serial;
                serial=Q_NULLPTR;
        }
}

void NMEALookupHelper::query()
{
        if(isReady())
        {
                //kick off a single update request
                nmea->requestUpdate(3000);
        }
        else
                emit queryError("NMEA helper not ready");
}
void NMEALookupHelper::setPeriodicQuery(int interval)
{
        if(isReady())
        {
                if (interval==0)
                        nmea->stopUpdates();
                else
                {
                        nmea->setUpdateInterval(interval);
                        nmea->startUpdates();
                }
        }
        else
                emit queryError("NMEA helper not ready");
}

void NMEALookupHelper::nmeaUpdated(const QGeoPositionInfo &update)
{
        bool verbose=qApp->property("verbose").toBool();
        if (verbose)
                qDebug() << "NMEA updated";

        QGeoCoordinate coord=update.coordinate();
        QDateTime timestamp=update.timestamp();

        if (verbose)
        {
                qDebug() << " - time: " << timestamp.toString();
                qDebug() << " - location: Long=" << coord.longitude() << " Lat=" << coord.latitude() << " Alt=" << coord.altitude();
        }
        if (update.isValid()) // emit queryFinished(loc) with new location
        {
                StelLocation loc;
                loc.setLongitude(static_cast<float>(coord.longitude()));
                loc.setLatitude(static_cast<float>(coord.latitude()));
                // 2D fix may have only long/lat, invalid altitude.
                loc.altitude=( qIsNaN(coord.altitude()) ? 0 : static_cast<int>(floor(coord.altitude())));
                emit queryFinished(loc);
        }
        else
        {
                if (verbose)
                        qDebug() << "(This position update was an invalid package)";
                emit queryError("NMEA update: invalid package");
        }
}

void NMEALookupHelper::nmeaError(QGeoPositionInfoSource::Error error)
{
#if (QT_VERSION>=QT_VERSION_CHECK(6,0,0))
        emit queryError(QString("NMEA general error: %1").arg(QVariant::fromValue(error).toString()));
#else
        emit queryError(QString("NMEA general error: %1").arg(error));
#endif
}
#if (QT_VERSION<QT_VERSION_CHECK(6,0,0))
void NMEALookupHelper::nmeaTimeout()
{
        emit queryError("NMEA timeout");
}
#endif
#endif

StelLocationMgr::StelLocationMgr()
        : nmeaHelper(Q_NULLPTR), libGpsHelper(Q_NULLPTR)
{
        QSettings* conf = StelApp::getInstance().getSettings();

        // N.B. Further missing TZ names will be printed out in the log.txt. Resolve these by adding into data/timezone.tab file.
        loadTimeZoneFixes();

        loadCountries();
        loadRegions();
        // The line below allows to re-generate the location file, you still need to gunzip it manually afterward.
        if (conf->value("devel/convert_locations_list", false).toBool())
                generateBinaryLocationFile("data/base_locations.txt", false, "data/base_locations.bin");

        locations = loadCitiesBin("data/base_locations.bin.gz");
#if QT_VERSION >= QT_VERSION_CHECK(5,15,0)
        locations.insert(loadCities("data/user_locations.txt", true));
#else
        locations.unite(loadCities("data/user_locations.txt", true));
#endif
        // Init to Paris France because it's the center of the world.
        lastResortLocation = locationForString(conf->value("init_location/last_location", "Paris, Western Europe").toString());
}

StelLocationMgr::~StelLocationMgr()
{
        if (nmeaHelper)
        {
                delete nmeaHelper;
                nmeaHelper=Q_NULLPTR;
        }
        if (libGpsHelper)
        {
                delete libGpsHelper;
                libGpsHelper=Q_NULLPTR;
        }
}

StelLocationMgr::StelLocationMgr(const LocationList &locations)
        : nmeaHelper(Q_NULLPTR), libGpsHelper(Q_NULLPTR)
{
        setLocations(locations);

        QSettings* conf = StelApp::getInstance().getSettings();
        // Init to Paris France because it's the center of the world.
        lastResortLocation = locationForString(conf->value("init_location/last_location", "Paris, Western Europe").toString());
}

void StelLocationMgr::setLocations(const LocationList &locations)
{
        this->locations.clear();
        for (const auto& loc : locations)
        {
                this->locations.insert(loc.getID(), loc);
        }

        emit locationListChanged();
}

void StelLocationMgr::generateBinaryLocationFile(const QString& fileName, bool isUserLocation, const QString& binFilePath) const
{
        qDebug() << "Generating a locations list...";
        const QMap<QString, StelLocation>& cities = loadCities(fileName, isUserLocation);
        QFile binfile(StelFileMgr::findFile(binFilePath, StelFileMgr::New));
        if(binfile.open(QIODevice::WriteOnly))
        {
                QDataStream out(&binfile);
                out.setVersion(QDataStream::Qt_5_2);
                out << cities;
                binfile.flush();
                binfile.close();
        }
        qDebug() << "[...] Please use 'gzip -nc base_locations.bin > base_locations.bin.gz' to pack a locations list.";
}

LocationMap StelLocationMgr::loadCitiesBin(const QString& fileName)
{
        QMap<QString, StelLocation> res;
        QString cityDataPath = StelFileMgr::findFile(fileName);
        if (cityDataPath.isEmpty())
                return res;

        QFile sourcefile(cityDataPath);
        if (!sourcefile.open(QIODevice::ReadOnly))
        {
                qWarning() << "ERROR: Could not open location data file: " << QDir::toNativeSeparators(cityDataPath);
                return res;
        }

        if (fileName.endsWith(".gz"))
        {
                QDataStream in(StelUtils::uncompress(sourcefile.readAll()));
                in.setVersion(QDataStream::Qt_5_2);
                in >> res;
        }
        else
        {
                QDataStream in(&sourcefile);
                in.setVersion(QDataStream::Qt_5_2);
                in >> res;
        }
        // Now res has all location data. However, some timezone names are not available in various versions of Qt.
        // Sanity checks: It seems we must translate timezone names. Quite a number on Windows, but also still some on Linux.
        QList<QByteArray> availableTimeZoneList=QTimeZone::availableTimeZoneIds();
        QStringList unknownTZlist;
        for (auto& loc : res)
        {
                if ((loc.ianaTimeZone!="LMST") && (loc.ianaTimeZone!="LTST") && ( ! availableTimeZoneList.contains(loc.ianaTimeZone.toUtf8())) )
                {
                        // TZ name which is currently unknown to Qt detected. See if we can translate it, if not: complain to qDebug().
                        QString fixTZname=sanitizeTimezoneStringFromLocationDB(loc.ianaTimeZone);
                        if (availableTimeZoneList.contains(fixTZname.toUtf8()))
                        {
                                loc.ianaTimeZone=fixTZname;
                        }
                        else
                        {
                                qDebug() << "StelLocationMgr::loadCitiesBin(): TimeZone for " << loc.name <<  " not found: " << loc.ianaTimeZone;
                                unknownTZlist.append(loc.ianaTimeZone);
                        }
                }
        }
        if (!unknownTZlist.isEmpty())
        {
                unknownTZlist.removeDuplicates();
                unknownTZ = true;
                qDebug() << "StelLocationMgr::loadCitiesBin(): Summary of unknown TimeZones:";
                for (const auto& tz : unknownTZlist)
                {
                        qDebug() << tz;
                }
                qDebug() << "Please report these timezone names (this logfile) to the Stellarium developers.";
                // Note to developers: Fill those names and replacements to the map above.
        }

        return res;
}

// Done in the following: TZ name sanitizing also for text file!
LocationMap StelLocationMgr::loadCities(const QString& fileName, bool isUserLocation)
{
        // Load the cities from data file
        QMap<QString, StelLocation> locations;
        QString cityDataPath = StelFileMgr::findFile(fileName);
        if (cityDataPath.isEmpty())
        {
                // Note it is quite normal not to have a user locations file (e.g. first run)
                if (!isUserLocation)
                        qWarning() << "WARNING: Failed to locate location data file: " << QDir::toNativeSeparators(fileName);
                return locations;
        }

        QFile sourcefile(cityDataPath);
        if (!sourcefile.open(QIODevice::ReadOnly | QIODevice::Text))
        {
                qWarning() << "ERROR: Could not open location data file: " << QDir::toNativeSeparators(cityDataPath);
                return locations;
        }

        // Read the data serialized from the file.
        // Code below borrowed from Marble (http://edu.kde.org/marble/)
        QTextStream sourcestream(&sourcefile);
#if (QT_VERSION>=QT_VERSION_CHECK(6,0,0))
        sourcestream.setEncoding(QStringConverter::Utf8);
#else
        sourcestream.setCodec("UTF-8");
#endif
        StelLocation loc;
        while (!sourcestream.atEnd())
        {
                const QString& rawline=sourcestream.readLine();
                if (rawline.isEmpty() || rawline.startsWith('#') || (rawline.split("\t").count() < 8))
                        continue;
                loc = StelLocation::createFromLine(rawline);
                loc.isUserLocation = isUserLocation;
                const QString& locId = loc.getID();

                if (locations.contains(locId))
                {
                        // Add the state in the name of the existing one and the new one to differentiate
                        StelLocation loc2 = locations[locId];
                        if (!loc2.state.isEmpty())
                                loc2.name += " ("+loc2.state+")";
                        // remove and re-add the fixed version
                        locations.remove(locId);
                        locations.insert(loc2.getID(), loc2);

                        if (!loc.state.isEmpty())
                                loc.name += " ("+loc.state+")";
                        locations.insert(loc.getID(), loc);
                }
                else
                {
                        locations.insert(locId, loc);
                }
        }
        sourcefile.close();
        return locations;
}

static float parseAngle(const QString& s, bool* ok)
{
        float ret;
        // First try normal decimal value.
        ret = s.toFloat(ok);
        if (*ok) return ret;
        // Try GPS coordinate like +121°33'38.28"
        static const QRegularExpression reg("([+-]?[\\d.]+)°(?:([\\d.]+)')?(?:([\\d.]+)\")?");
        QRegularExpressionMatch match=reg.match(s);
        if (match.hasMatch())
        {
                float deg = match.captured(1).toFloat(ok);
                if (!*ok) return 0;
                float min = match.captured(2).isEmpty()? 0 : match.captured(2).toFloat(ok);
                if (!*ok) return 0;
                float sec = match.captured(3).isEmpty()? 0 : match.captured(3).toFloat(ok);
                if (!*ok) return 0;
                if (deg < 0)
                        return deg - min / 60 - sec / 3600;
                else
                        return deg + min / 60 + sec / 3600;
        }
        return 0;
}

const StelLocation StelLocationMgr::locationForString(const QString& s) const
{
        auto iter = locations.find(s);
        if (iter!=locations.end())
        {
                return iter.value();
        }
        // Maybe this is a city and country names (old format of the data)?
        static const QRegularExpression cnreg("(.+),\\s+(.+)$");
        QRegularExpressionMatch cnMatch=cnreg.match(s);
        if (cnMatch.hasMatch())
        {
                // NOTE: This method will give wrong data for some Russians and U.S. locations
                //       (Asian locations for Russia and for locations on Hawaii for U.S.)
                QString city = cnMatch.captured(1).trimmed();
                QString country = cnMatch.captured(2).trimmed();
                auto iter = locations.find(QString("%1, %2").arg(city, pickRegionFromCountry(country)));
                if (iter!=locations.end())
                {
                        return iter.value();
                }
        }
        // Maybe a full Location line? (e.g. ObservationLists)
        if (s.count("\t")>6) // heuristic. Regular locations should not have tabs in the name.
                return StelLocation::createFromLine(s);

        StelLocation ret;
        // Maybe it is a coordinate set with elevation?
        static const QRegularExpression csreg("(.+),\\s*(.+),\\s*(.+)");
        QRegularExpressionMatch csMatch=csreg.match(s);
        if (csMatch.hasMatch())
        {
                bool ok;
                // We have a set of coordinates
                ret.setLatitude(parseAngle(csMatch.captured(1).trimmed(), &ok));
                if (!ok) ret.role = '!';
                ret.setLongitude(parseAngle(csMatch.captured(2).trimmed(), &ok));
                if (!ok) ret.role = '!';
                ret.altitude = csMatch.captured(3).trimmed().toInt(&ok);
                if (!ok) ret.role = '!';
                ret.name = QString("%1, %2").arg(QString::number(ret.getLatitude(), 'f', 2), QString::number(ret.getLongitude(), 'f', 2));
                ret.planetName = "Earth";
                return ret;
        }
        // Maybe it is a coordinate set without elevation? (e.g. GPS 25.107363,121.558807 )
        static const QRegularExpression reg("(?:(.+)\\s+)?(.+),\\s*(.+)"); // FIXME: Seems regexp is not very good
        QRegularExpressionMatch match=reg.match(s);
        if (match.hasMatch())
        {
                bool ok;
                // We have a set of coordinates
                ret.setLatitude(parseAngle(match.captured(2).trimmed(), &ok));
                if (!ok) ret.role = '!';
                ret.setLongitude(parseAngle(match.captured(3).trimmed(), &ok));
                if (!ok) ret.role = '!';
                ret.name = match.captured(1).trimmed();
                ret.planetName = "Earth";
                return ret;
        }
        // All attempts to decode have failed. Return invalid location with this name.
        ret.name=s;
        ret.planetName = "Earth";
        ret.role = '!';
        return ret;
}

const StelLocation StelLocationMgr::locationFromCLI() const
{
        StelLocation ret;
        QSettings* conf = StelApp::getInstance().getSettings();
        conf->beginGroup("location_run_once");

        const auto latVar = conf->value("latitude");
        if (latVar.isValid())
                ret.setLatitude(180/M_PI * latVar.toDouble());
        else
                ret.role = '!';

        const auto lonVar = conf->value("longitude");
        if (lonVar.isValid())
                ret.setLongitude(180/M_PI * lonVar.toDouble());
        else
                ret.role = '!';
        bool ok;
        ret.altitude = conf->value("altitude", 0).toInt(&ok);
        ret.planetName = conf->value("home_planet", "Earth").toString();
        ret.landscapeKey = conf->value("landscape_name", "guereins").toString();
        conf->endGroup();
        conf->remove("location_run_once");
        ret.state="CLI"; // flag this location with a marker for handling in LandscapeMgr::init(). state is not displayed anywhere, so I expect no issues from that.
        return ret;
}

// Get whether a location can be permanently added to the list of user locations
bool StelLocationMgr::canSaveUserLocation(const StelLocation& loc) const
{
        return loc.isValid() && locations.find(loc.getID())==locations.end();
}

// Add permanently a location to the list of user locations
bool StelLocationMgr::saveUserLocation(const StelLocation& loc)
{
        if (!canSaveUserLocation(loc))
                return false;

        // Add in the program
        locations[loc.getID()]=loc;

        //emit before saving the list
        emit locationListChanged();

        // Append to the user location file
        QString cityDataPath = StelFileMgr::findFile("data/user_locations.txt", StelFileMgr::Flags(StelFileMgr::Writable|StelFileMgr::File));
        if (cityDataPath.isEmpty())
        {
                if (!StelFileMgr::exists(StelFileMgr::getUserDir()+"/data"))
                {
                        if (!StelFileMgr::mkDir(StelFileMgr::getUserDir()+"/data"))
                        {
                                qWarning() << "ERROR - cannot create non-existent data directory" << QDir::toNativeSeparators(StelFileMgr::getUserDir()+"/data");
                                qWarning() << "Location cannot be saved";
                                return false;
                        }
                }

                cityDataPath = StelFileMgr::getUserDir()+"/data/user_locations.txt";
                qWarning() << "Will create a new user location file: " << QDir::toNativeSeparators(cityDataPath);
        }

        QFile sourcefile(cityDataPath);
        if (!sourcefile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append))
        {
                qWarning() << "ERROR: Could not open location data file: " << QDir::toNativeSeparators(cityDataPath);
                return false;
        }

        QTextStream outstream(&sourcefile);
#if (QT_VERSION>=QT_VERSION_CHECK(6,0,0))
        outstream.setEncoding(QStringConverter::Utf8);
#else
        outstream.setCodec("UTF-8");
#endif
        outstream << loc.serializeToLine() << '\n';
        sourcefile.close();

        return true;
}

// Get whether a location can be deleted from the list of user locations
// If the location comes from the base read only list, it cannot be deleted
bool StelLocationMgr::canDeleteUserLocation(const QString& id) const
{
        auto iter=locations.find(id);

        // If it's not known at all there is a problem
        if (iter==locations.end())
                return false;

        return iter.value().isUserLocation;
}

// Delete permanently the given location from the list of user locations
// If the location comes from the base read only list, it cannot be deleted and false is returned
bool StelLocationMgr::deleteUserLocation(const QString& id)
{
        if (!canDeleteUserLocation(id))
                return false;

        locations.remove(id);

        //emit before saving the list
        emit locationListChanged();

        // Resave the whole remaining user locations file
        QString cityDataPath = StelFileMgr::findFile("data/user_locations.txt", StelFileMgr::Writable);
        if (cityDataPath.isEmpty())
        {
                if (!StelFileMgr::exists(StelFileMgr::getUserDir()+"/data"))
                {
                        if (!StelFileMgr::mkDir(StelFileMgr::getUserDir()+"/data"))
                        {
                                qWarning() << "ERROR - cannot create non-existent data directory" << QDir::toNativeSeparators(StelFileMgr::getUserDir()+"/data");
                                qWarning() << "Location cannot be saved";
                                return false;
                        }
                }

                cityDataPath = StelFileMgr::getUserDir()+"/data/user_locations.txt";
                qWarning() << "Will create a new user location file: " << QDir::toNativeSeparators(cityDataPath);
        }

        QFile sourcefile(cityDataPath);
        if (!sourcefile.open(QIODevice::WriteOnly | QIODevice::Text))
        {
                qWarning() << "ERROR: Could not open location data file: " << QDir::toNativeSeparators(cityDataPath);
                return false;
        }

        QTextStream outstream(&sourcefile);
#if (QT_VERSION>=QT_VERSION_CHECK(6,0,0))
        outstream.setEncoding(QStringConverter::Utf8);
#else
        outstream.setCodec("UTF-8");
#endif

        for (QMap<QString, StelLocation>::ConstIterator iter=locations.constBegin();iter!=locations.constEnd();++iter)
        {
                if (iter.value().isUserLocation)
                {
                        outstream << iter.value().serializeToLine() << '\n';
                }
        }

        sourcefile.close();
        return true;
}

// lookup location from IP address.
void StelLocationMgr::locationFromIP()
{
        QSettings* conf = StelApp::getInstance().getSettings();
        QNetworkRequest req( QUrl( conf->value("main/geoip_api_url", "https://freegeoip.stellarium.org/json/").toString() ) );
        req.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
        req.setRawHeader("User-Agent", StelUtils::getUserAgentString().toLatin1());
        QNetworkReply* networkReply=StelApp::getInstance().getNetworkAccessManager()->get(req);
        connect(networkReply, SIGNAL(finished()), this, SLOT(changeLocationFromNetworkLookup()));
}

#ifdef ENABLE_GPS
void StelLocationMgr::locationFromGPS(int interval)
{
        bool verbose=qApp->property("verbose").toBool();

#ifdef ENABLE_LIBGPS
        if(!libGpsHelper)
        {
                libGpsHelper = new LibGPSLookupHelper(this);
                connect(libGpsHelper, SIGNAL(queryFinished(StelLocation)), this, SLOT(changeLocationFromGPSQuery(StelLocation)));
                connect(libGpsHelper, SIGNAL(queryError(QString)), this, SLOT(gpsQueryError(QString)));
        }
        if(libGpsHelper->isReady())
        {
                if (interval<0)
                        libGpsHelper->query();
                else
                {
                        libGpsHelper->setPeriodicQuery(interval);
                        // It seemed possible to leave the LibGPShelper object alive once created, because it does not block
                        // access to the GPS device. However, under pathological circumstances (start/stop of GPSD daemon
                        // after first query and while Stellarium is running, annoying GPSD in other ways, etc.,
                        // the LibGPSLookupHelper may signal ready but still shows problems.
                        // It seems better to also destroy it after finish of queries here and in case of non-readiness below.
                        if (interval==0)
                        {
                                if (verbose)
                                        qDebug() << "Deactivating and deleting LibGPShelper...";
                                delete libGpsHelper;
                                libGpsHelper=Q_NULLPTR;
                                emit gpsQueryFinished(true); // signal "successful operation", avoid showing any error in GUI.
                                if (verbose)
                                        qDebug() << "Deactivating and deleting LibGPShelper... DONE";
                        }
                }
                return;
        }
        else
        {
                qDebug() << "LibGPSHelper not ready. Attempting a direct NMEA connection instead.";
                delete libGpsHelper;
                libGpsHelper=Q_NULLPTR;
        }
#endif
        if(!nmeaHelper)
        {
                if (verbose)
                        qDebug() << "Creating new NMEAhelper...";
                nmeaHelper = new NMEALookupHelper(this);
                connect(nmeaHelper, SIGNAL(queryFinished(StelLocation)), this, SLOT(changeLocationFromGPSQuery(StelLocation)));
                connect(nmeaHelper, SIGNAL(queryError(QString)), this, SLOT(gpsQueryError(QString)));
                if (verbose)
                        qDebug() << "Creating new NMEAhelper...done";
        }
        if(nmeaHelper->isReady())
        {
                if (interval<0)
                        nmeaHelper->query();
                else
                {
                        nmeaHelper->setPeriodicQuery(interval);
                        if (interval==0)
                        {
                                if (verbose)
                                        qDebug() << "Deactivating and deleting NMEAhelper...";
                                delete nmeaHelper;
                                nmeaHelper=Q_NULLPTR;
                                emit gpsQueryFinished(true); // signal "successful operation", avoid showing any error in GUI.
                                if (verbose)
                                        qDebug() << "Deactivating and deleting NMEAhelper... DONE";
                        }
                }
        }
        else
        {
                // something went wrong. However, a dysfunctional nmeaHelper may still exist, better delete it.
                if (verbose)
                        qDebug() << "nmeaHelper not ready. Something went wrong.";
                delete nmeaHelper;
                nmeaHelper=Q_NULLPTR;
#ifndef Q_OS_WIN
                emit gpsQueryFinished(false);
#else
                if (!positionSource)
                        positionSource = QGeoPositionInfoSource::createDefaultSource(this);
                if (positionSource)
                {
                        if (interval)
                        {
                                if (verbose)
                                        qDebug() << "Creating new positionSource...";
                                positionSource->setUpdateInterval(interval);
                                connect(positionSource, SIGNAL(positionUpdated(QGeoPositionInfo)), this, SLOT(positionUpdated(QGeoPositionInfo)));
                                positionSource->startUpdates();
                                if (verbose)
                                        qDebug() << "Creating new positionSource...done";
                        }
                        else
                        {
                                if (verbose)
                                        qDebug() << "Deactivating and deleting gps...";
                                positionSource->stopUpdates();
                                delete positionSource;
                                positionSource=Q_NULLPTR;
                        }
                        emit gpsQueryFinished(true); // signal "successful operation", avoid showing any error in GUI.
                }
                else
                {
                        emit gpsQueryFinished(false);
                }
#endif
        }
}

#ifdef Q_OS_WIN
void StelLocationMgr::positionUpdated(QGeoPositionInfo info)
{
        bool verbose=qApp->property("verbose").toBool();
        StelLocation loc;
        if (info.isValid())
        {
                loc.setLongitude(info.coordinate().longitude());
                loc.setLatitude(info.coordinate().latitude());
                double a = info.coordinate().altitude();
                loc.altitude = qIsNaN(a) ? 0 : qRound(a);
                changeLocationFromGPSQuery(loc);
        }
        else
        {
                // something went wrong. However, a dysfunctional positionSource may still exist, better delete it.
                if (verbose)
                        qDebug() << "gps not ready. Something went wrong.";
                positionSource->stopUpdates();
                delete positionSource;
                positionSource=Q_NULLPTR;
                emit gpsQueryFinished(false);
        }
}
#endif

void StelLocationMgr::changeLocationFromGPSQuery(const StelLocation &locin)
{
        bool verbose=qApp->property("verbose").toBool();
        StelCore *core=StelApp::getInstance().getCore();
        StelLocation loc=locin;
        loc.lightPollutionLuminance=StelLocation::DEFAULT_LIGHT_POLLUTION_LUMINANCE;
        // Usually you don't leave your time zone with GPS.
        loc.ianaTimeZone=core->getCurrentTimeZone();
        loc.isUserLocation=true;
        loc.planetName="Earth";
        loc.name=QString("GPS %1%2 %3%4")
                .arg(loc.getLatitude()<0?"S":"N").arg(qRound(abs(loc.getLatitude())))
                .arg(loc.getLongitude()<0?"W":"E").arg(qRound(abs(loc.getLongitude())));

        core->moveObserverTo(loc, 0.0, 0.0);
        if (nmeaHelper)
        {
                if (verbose)
                        qDebug() << "Change location from NMEA... successful. NMEAhelper stays active.";
        }
        if (verbose)
        {
                qDebug() << "Location in progress: Long=" << loc.getLongitude() << " Lat=" << loc.getLatitude() << " Alt" << loc.altitude;
                qDebug() << "New location named " << loc.name;
                qDebug() << "queryOK, resetting GUI";
        }
        emit gpsQueryFinished(true);
}

void StelLocationMgr::gpsQueryError(const QString &err)
{
        qWarning()<<err;
        if (nmeaHelper)
        {
                nmeaHelper->setPeriodicQuery(0); // stop queries if they came periodically.
                //qDebug() << "Would Close nmeaHelper during error...";
                // We should close the serial line to let other programs use the GPS device. (Not needed for the GPSD solution!)
                //delete nmeaHelper;
                //nmeaHelper=Q_NULLPTR;
                //qDebug() << "Would Close nmeaHelper during error.....successful";
        }
        qDebug() << "GPS queryError, resetting GUI";
        emit gpsQueryFinished(false);
}
#endif

// slot that receives IP-based location data from the network.
void StelLocationMgr::changeLocationFromNetworkLookup()
{
        StelCore *core=StelApp::getInstance().getCore();
        QNetworkReply* networkReply = qobject_cast<QNetworkReply*>(sender());
        if (!networkReply)
            return;

        if (networkReply->error() == QNetworkReply::NoError && networkReply->bytesAvailable()>0)
        {
                // success                 
                try
                {
                        QVariantMap locMap = StelJsonParser::parse(networkReply->readAll()).toMap();

                        QString ipRegion = locMap.value("region_name").toString();
                        if (ipRegion.isEmpty())
                                ipRegion = locMap.value("region").toString();
                        QString ipCity = locMap.value("city").toString();
                        QString ipCountry = locMap.value("country_name").toString(); // NOTE: Got a short name of country
                        QString ipCountryCode = locMap.value("country_code").toString();
                        QString ipTimeZone = locMap.value("time_zone").toString();
                        if (ipTimeZone.isEmpty())
                                ipTimeZone = locMap.value("timezone").toString();
                        double latitude=locMap.value("latitude").toDouble();
                        double longitude=locMap.value("longitude").toDouble();

                        qDebug() << "Got location" << QString("%1, %2, %3 (%4, %5; %6)").arg(ipCity, ipRegion, ipCountry).arg(latitude).arg(longitude).arg(ipTimeZone) << "for IP" << locMap.value("ip").toString();

                        StelLocation loc;
                        loc.name    = (ipCity.isEmpty() ? QString("%1, %2").arg(latitude).arg(longitude) : ipCity);
                        loc.state   = (ipRegion.isEmpty() ? "IPregion"  : ipRegion);
                        loc.region = pickRegionFromCountryCode(ipCountryCode.isEmpty() ? "" : ipCountryCode.toLower());
                        loc.role    = QChar(0x0058); // char 'X'
                        loc.population = 0;
                        loc.setLatitude  (static_cast<float>(latitude));
                        loc.setLongitude (static_cast<float>(longitude));
                        loc.altitude = 0;
                        loc.lightPollutionLuminance = StelLocation::DEFAULT_LIGHT_POLLUTION_LUMINANCE;
                        loc.ianaTimeZone = (ipTimeZone.isEmpty() ? "" : ipTimeZone);
                        loc.planetName = "Earth";
                        loc.landscapeKey = "";

                        // Ensure that ipTimeZone is a valid IANA timezone name!
                        QTimeZone ipTZ(ipTimeZone.toUtf8());
                        core->setCurrentTimeZone( !ipTZ.isValid() || ipTimeZone.isEmpty() ? "LMST" : ipTimeZone);
                        core->moveObserverTo(loc, 0.0, 0.0);
                        QSettings* conf = StelApp::getInstance().getSettings();
                        conf->setValue("init_location/last_location", QString("%1, %2").arg(latitude).arg(longitude));
                }
                catch (const std::exception& e)
                {
                        qDebug() << "Failure getting IP-based location: answer is in not acceptable format! Error: " << e.what()
                                        << "\nLet's use Paris, France as default location...";
                        core->moveObserverTo(getLastResortLocation(), 0.0, 0.0); // Answer is not in JSON format! A possible block by DNS server or firewall
                }
        }
        else
        {
                qDebug() << "Failure getting IP-based location: \n\t" << networkReply->errorString();
                // If there is a problem, this must not change to some other location! Just ignore.
        }
        networkReply->deleteLater();
}

LocationMap StelLocationMgr::pickLocationsNearby(const QString planetName, const float longitude, const float latitude, const float radiusDegrees)
{
        QMap<QString, StelLocation> results;
        QMapIterator<QString, StelLocation> iter(locations);
        while (iter.hasNext())
        {
                iter.next();
                const StelLocation *loc=&iter.value();
                if ( (loc->planetName == planetName) &&
                                (StelLocation::distanceDegrees(longitude, latitude, loc->getLongitude(), loc->getLatitude()) <= radiusDegrees) )
                {
                        results.insert(iter.key(), iter.value());
                }
        }
        return results;
}

LocationMap StelLocationMgr::pickLocationsInRegion(const QString region)
{
        QMap<QString, StelLocation> results;
        QMapIterator<QString, StelLocation> iter(locations);
        while (iter.hasNext())
        {
                iter.next();
                const StelLocation *loc=&iter.value();
                if (loc->region == region)
                {
                        results.insert(iter.key(), iter.value());
                }
        }
        return results;
}

void StelLocationMgr::loadCountries()
{
        // Load ISO 3166-1 two-letter country codes from file
        // The format is "[code][tab][country name containing spaces][newline]"
        countryNameToCodeMap.clear();
        QFile textFile(StelFileMgr::findFile("data/iso3166.tab"));
        if(textFile.open(QFile::ReadOnly | QFile::Text))
        {
                QString line;
                int readOk=0;
                while(!textFile.atEnd())
                {
                        line = QString::fromUtf8(textFile.readLine());
                        if (line.startsWith("//") || line.startsWith("#") || line.isEmpty())
                                continue;

                        if (!line.isEmpty())
                        {
                                #if (QT_VERSION>=QT_VERSION_CHECK(5, 14, 0))
                                QStringList list=line.split("\t", Qt::KeepEmptyParts);
                                #else
                                QStringList list=line.split("\t", QString::KeepEmptyParts);
                                #endif
                                QString code = list.at(0).trimmed().toLower();
                                QString country = list.at(1).trimmed().replace("&", "and");
                                countryNameToCodeMap.insert(country, code);
                                readOk++;
                        }
                }
                textFile.close();
                if (readOk>0)
                        qDebug() << "Loaded" << readOk << "countries";
                else
                        qDebug() << "ERROR: List of countries was not loaded!";
        }
        // aliases for some countries to backward compatibility
        countryNameToCodeMap.insert("Russian Federation", "ru");
        countryNameToCodeMap.insert("Taiwan (Provice of China)", "tw");
}

void StelLocationMgr::loadTimeZoneFixes()
{
        QString tzFilePath = StelFileMgr::findFile(tzfFileName);
        if (tzFilePath.isEmpty())
        {
                tzFilePath = StelFileMgr::findFile(tzfFileName, StelFileMgr::New);
                // Create a default TZF (timezone fixes) file
                QFile tzSrc(":/data/timezone.tab");
                if (!tzSrc.copy(tzFilePath))
                {
                        qWarning() << "Cannot copy timezone fixes to " + QDir::toNativeSeparators(tzFilePath);
                        return;
                }
                QFile dest(tzFilePath);
                // fix file permissions
                dest.setPermissions(dest.permissions() | QFile::WriteOwner);
        }
        QFile tzFile(tzFilePath);

        if(tzFile.open(QFile::ReadOnly | QFile::Text))
        {
                locationDBToIANAtranslations.clear();
                QString line;
                locationDBToIANAtranslations.insert("", "UTC"); // a first fix
                int readOk = 1;
                static const QRegularExpression dataRx("^([\\w\\/]+)\\t([\\w\\/\\+\\-:]+)\\s*(.*)$");
                while(!tzFile.atEnd())
                {
                        line = QString::fromUtf8(tzFile.readLine());
                        if (line.startsWith("//") || line.startsWith("#") || line.isEmpty())
                                continue;

                        QRegularExpressionMatch dataMatch = dataRx.match(line);
                        if (dataMatch.hasMatch())
                        {
                                // The first entry is the DB name, the second is as we display it in the program.
                                locationDBToIANAtranslations.insert(dataMatch.captured(1).trimmed().toUtf8(), dataMatch.captured(2).trimmed().toUtf8());
                                readOk++;
                        }
                }
                qDebug() << "Loaded" << readOk << "fixes for time zones";
                tzFile.close();
        }
}

void StelLocationMgr::loadRegions()
{
        QFile geoFile(StelFileMgr::findFile("data/regions-geoscheme.tab"));
        if(geoFile.open(QFile::ReadOnly | QFile::Text))
        {
                QString line;
                int readOk=0;
                regions.clear();
                countryCodeToRegionMap.clear();
                while(!geoFile.atEnd())
                {
                        line = QString::fromUtf8(geoFile.readLine());
                        if (line.startsWith("//") || line.startsWith("#") || line.isEmpty())
                                continue;

                        if (!line.isEmpty())
                        {
                                #if (QT_VERSION>=QT_VERSION_CHECK(5, 14, 0))
                                QStringList list=line.split("\t", Qt::KeepEmptyParts);
                                #else
                                QStringList list=line.split("\t", QString::KeepEmptyParts);
                                #endif

                                QString regionName = list.at(2).trimmed();
                                QString countries;
                                if (list.size()>3)
                                        countries = list.at(3).trimmed().toLower();
                                GeoRegion region;
                                region.code = list.at(0).trimmed().toInt();
                                region.planet = list.at(1).trimmed();
                                region.regionName = regionName;
                                region.countries = countries;

                                if (!countries.isEmpty())
                                {
                                        #if (QT_VERSION>=QT_VERSION_CHECK(5, 14, 0))
                                        QStringList country=countries.split(",", Qt::KeepEmptyParts);
                                        #else
                                        QStringList country=countries.split(",", QString::KeepEmptyParts);
                                        #endif
                                        for (int i = 0; i<country.size(); i++)
                                        {
                                                countryCodeToRegionMap.insert(country.at(i), regionName);
                                        }
                                }

                                regions.push_back(region);
                                readOk++;
                        }
                }
                geoFile.close();
                if (readOk>0)
                        qDebug() << "Loaded" << readOk << "regions";
                else
                        qDebug() << "ERROR: List of regions was not loaded!";
        }
}

QStringList StelLocationMgr::getRegionNames(const QString& planet) const
{
        QStringList allregions;
        if (planet.isEmpty())
        {
                for (int i=0;i<regions.size();i++)
                        allregions.append(regions.at(i).regionName);
        }
        else
        {
                for (int i=0;i<regions.size();i++)
                {
                        if (planet.contains(regions.at(i).planet, Qt::CaseInsensitive) && !planet.contains("Observer", Qt::CaseInsensitive))
                                allregions.append(regions.at(i).regionName);
                }
        }

        return allregions;
}

QString StelLocationMgr::pickRegionFromCountryCode(const QString countryCode)
{
        QMap<QString, QString>::ConstIterator i = countryCodeToRegionMap.find(countryCode);
        return (i!=countryCodeToRegionMap.constEnd()) ? i.value() : QString();
}

QString StelLocationMgr::pickRegionFromCountry(const QString country)
{
        QMap<QString, QString>::ConstIterator i = countryNameToCodeMap.find(country);
        QString code = (i!=countryNameToCodeMap.constEnd()) ? i.value() : QString();
        return pickRegionFromCountryCode(code);
}

QString StelLocationMgr::pickRegionFromCode(int regionCode)
{
        QString region;
        for(int i=0;i<regions.size();i++)
        {
                if (regions.at(i).code == regionCode)
                        region = regions.at(i).regionName;
        }
        return region;
}

// Check timezone string and return either the same or the corresponding string that we use in the Stellarium location database.
// If timezone name starts with "UTC", always return unchanged.
// This is required to store timezone names exactly as we know them, and not mix ours and current-iana spelling flavour.
// In practice, reverse lookup to locationDBToIANAtranslations
QString StelLocationMgr::sanitizeTimezoneStringForLocationDB(QString tzString)
{
        if (tzString.startsWith("UTC"))
                return tzString;
        QByteArray res=locationDBToIANAtranslations.key(tzString.toUtf8(), "---");
        if ( res != "---")
                return QString(res);
        return tzString;
}

// Attempt to translate a timezone name from those used in Stellarium's location database to a name which is valid
// as ckeckable by QTimeZone::availableTimeZoneIds(). That list may be updated anytime and is known to differ
// between OSes. Some spellings may be different, or in some cases some names get simply translated to "UTC+HH:MM" style.
// The empty string gets translated to "UTC".
QString StelLocationMgr::sanitizeTimezoneStringFromLocationDB(QString dbString)
{
        if (dbString.startsWith("UTC"))
                return dbString;
        // Maybe silences a debug later:
        if (dbString=="")
                return "UTC";
        QByteArray res=locationDBToIANAtranslations.value(dbString.toUtf8(), "---");
        if ( res != "---")
                return QString(res);
        return dbString;
}

QStringList StelLocationMgr::getAllTimezoneNames() const
{
        QStringList ret;

        QMapIterator<QString, StelLocation> iter(locations);
        while (iter.hasNext())
        {
                iter.next();
                const StelLocation *loc=&iter.value();
                QString tz(loc->ianaTimeZone);
                if (!ret.contains(tz))
                        ret.append(tz);
        }
        // 0.19: So far, this includes the existing names, but QTimeZone also has a few other names.
        // Accept others after testing against sanitized names, and especially all UT+/- names!

        auto tzList = QTimeZone::availableTimeZoneIds(); // System dependent set of IANA timezone names.
        for (const auto& tz : qAsConst(tzList))
        {
                QString tzcand=sanitizeTimezoneStringFromLocationDB(tz); // try to find name as we use it in the program.
                if (!ret.contains(tzcand))
                {
                        //qDebug() << "Extra insert Qt/IANA TZ entry from QTimeZone::availableTimeZoneIds(): " << tz << "as" << tzcand;
                        ret.append(QString(tzcand));
                }
        }

        // Special cases!
        ret.append("LMST");
        ret.append("LTST");
        ret.append("system_default");
        ret.sort();
        return ret;
}

Stellarium / stellarium / 4853788370

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