flightplan.cpp

// SPDX-FileCopyrightText: Copyright (C) 2013 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
#include "misc/aviation/flightplan.h"
 
#include <QDateTime>
#include <QDomDocument>
#include <QFile>
#include <QRegularExpression>
#include <QStringBuilder>
#include <QTimeZone>
 
#include "misc/aviation/airlineicaocode.h"
#include "misc/aviation/altitude.h"
#include "misc/fileutils.h"
#include "misc/iconlist.h"
#include "misc/json.h"
#include "misc/pq/speed.h"
#include "misc/pq/time.h"
#include "misc/propertyindexvariantmap.h" // needed for mixin::Index::apply
#include "misc/stringutils.h"
 
using namespace swift::misc::network;
using namespace swift::misc::physical_quantities;
 
SWIFT_DEFINE_VALUEOBJECT_MIXINS(swift::misc::aviation, CFlightPlanRemarks)
SWIFT_DEFINE_VALUEOBJECT_MIXINS(swift::misc::aviation, CFlightPlan)
 
namespace swift::misc::aviation
{
    CFlightPlanRemarks::CFlightPlanRemarks() {}
 
    CFlightPlanRemarks::CFlightPlanRemarks(const QString &remarks, bool parse) : m_remarks(cleanRemarks(remarks))
    {
        if (parse) { this->parseFlightPlanRemarks(); }
    }
 
    CFlightPlanRemarks::CFlightPlanRemarks(const QString &remarks, CVoiceCapabilities voiceCapabilities, bool parse)
        : m_remarks(cleanRemarks(remarks)), m_voiceCapabilities(voiceCapabilities)
    {
        if (parse) { this->parseFlightPlanRemarks(); }
    }
 
    bool CFlightPlanRemarks::setSelcalCode(const QString &selcal)
    {
        if (m_selcalCode == selcal || selcal.length() != 4) { return false; }
        const QString r =
            CFlightPlanRemarks::replaceRemark(m_remarks, QStringLiteral("SEL/"), QStringLiteral("SEL/%1").arg(selcal));
        m_remarks = r;
        return true;
    }
 
    void CFlightPlanRemarks::setVoiceCapabilities(const CVoiceCapabilities &capabilities)
    {
        m_voiceCapabilities = capabilities;
        const QString r =
            CFlightPlanRemarks::replaceVoiceCapabilities(m_voiceCapabilities.toFlightPlanRemarks(), m_remarks);
        m_remarks = r;
    }
 
    bool CFlightPlanRemarks::hasAnyParsedRemarks() const
    {
        if (!m_isParsed) { return false; }
        return this->hasParsedAirlineRemarks() || m_selcalCode.isValid() || !m_voiceCapabilities.isUnknown();
    }
 
    bool CFlightPlanRemarks::hasParsedAirlineRemarks() const
    {
        if (!m_isParsed) { return false; }
        return !m_radioTelephony.isEmpty() || !m_flightOperator.isEmpty() || m_airlineIcao.hasValidDesignator();
    }
 
    QString CFlightPlanRemarks::convertToQString(bool i18n) const
    {
        const QString s = (m_registration.isEmpty() ? QString() : u"reg.: " % m_registration.toQString(i18n)) %
                          (!this->hasValidAirlineIcao() ? QString() : u" airline: " % m_airlineIcao.getDesignator()) %
                          (m_radioTelephony.isEmpty() ? QString() : u" radio tel.:" % m_radioTelephony) %
                          (m_flightOperator.isEmpty() ? QString() : u" operator: " % m_flightOperator) %
                          (!m_selcalCode.isValid() ? QString() : u" SELCAL: " % m_selcalCode.getCode()) % u" voice: " %
                          m_voiceCapabilities.toQString(i18n);
        return s.simplified().trimmed();
    }
 
    QString CFlightPlanRemarks::textToVoiceCapabilitiesRemarks(const QString &text)
    {
        const CVoiceCapabilities vc = CVoiceCapabilities::fromText(text);
        return vc.toFlightPlanRemarks();
    }
 
    QString CFlightPlanRemarks::replaceVoiceCapabilities(const QString &newCapRemarks, const QString &oldRemarks)
    {
        if (newCapRemarks.isEmpty()) { return oldRemarks; }
        if (oldRemarks.isEmpty()) { return newCapRemarks; }
 
        QString r(oldRemarks);
        if (r.contains("/V/", Qt::CaseInsensitive))
        {
            r.replace("/V/", newCapRemarks, Qt::CaseInsensitive);
            return r;
        }
        if (r.contains("/R/", Qt::CaseInsensitive))
        {
            r.replace("/R/", newCapRemarks, Qt::CaseInsensitive);
            return r;
        }
        if (r.contains("/T/", Qt::CaseInsensitive))
        {
            r.replace("/T/", newCapRemarks, Qt::CaseInsensitive);
            return r;
        }
        return newCapRemarks % u' ' % r;
    }
 
    QString CFlightPlanRemarks::cleanRemarks(const QString &remarksIn)
    {
        QString r = remarksIn;
        r.replace(':', ' ');
        r = asciiOnlyString(simplifyAccents(r));
        return r;
    }
 
    void CFlightPlanRemarks::parseFlightPlanRemarks(bool force)
    {
        // examples: VFPS = VATSIM Flightplan Prefile System
        // 1) RT/KESTREL OPR/MYTRAVEL REG/G-DAJC SEL/FP-ES PER/C NAV/RNP10
        // 2) OPR/UAL CALLSIGN/UNITED
        // 3) /v/FPL-VIR9-IS-A346/DEP/S-EGLL/ARR/KJFK/REG/G-VGAS/TCAS RVR/200 OPR/VIRGIN AIRLINES
 
        if (!force && m_isParsed) { return; }
        m_isParsed = true;
        if (m_remarks.isEmpty()) { return; }
        const QString remarks = m_remarks.toUpper();
        const QString callsign =
            CCallsign::unifyCallsign(this->getRemark(remarks, "REG/")); // registration is a callsign
        if (CCallsign::isValidAircraftCallsign(callsign)) { m_registration = CCallsign(callsign, CCallsign::Aircraft); }
        m_voiceCapabilities = m_voiceCapabilities.isUnknown() ? CVoiceCapabilities(m_remarks) : m_voiceCapabilities;
        m_flightOperator =
            this->getRemark(remarks, "OPR/"); // operator, e.g. British airways, sometimes people use ICAO code here
        m_selcalCode = CSelcal(this->getRemark(remarks, "SEL/"));
        m_radioTelephony = getRemark(remarks, "CALLSIGN/"); // used similar to radio telephony
        if (m_radioTelephony.isEmpty()) { m_radioTelephony = getRemark(remarks, "RT/"); }
        if (!m_flightOperator.isEmpty() && CAirlineIcaoCode::isValidAirlineDesignator(m_flightOperator))
        {
            // if people use ICAO code as flight operator swap with airline ICAO
            m_airlineIcao = CAirlineIcaoCode(m_flightOperator);
            m_flightOperator.clear();
        }
    }
 
    QString CFlightPlanRemarks::getRemark(const QString &remarks, const QString &marker)
    {
        const int maxIndex = remarks.size() - 1;
        int f = remarks.indexOf(marker);
        if (f < 0) { return {}; }
        f += marker.length();
        if (maxIndex <= f) { return {}; }
 
        // the remarks are poorly formatted:
        // 1) sometimes the values are enclosed in "/", like "/REG/D-AMBZ/"
        // 2) sometimes the values are containing space, like "/OPR/DELTA AIRLINES"
        // 3) in many cases the end delimiter is a new marker or the EOL (otherwise 1 applies)
 
        thread_local const QRegularExpression nextMarker("\\s+\\w*/|$");
        int to1 = remarks.indexOf(nextMarker, f + 1); // for case 2,3
        if (to1 < 0) { to1 = maxIndex + 1; }
        int to2 = remarks.indexOf('/', f + 1); // for case 1
        if (to2 < 0) { to2 = maxIndex + 1; } // no more end markers, ends after last character
        const int to = qMin(to1, to2);
        const QString cut = remarks.mid(f, to - f).simplified();
        return cut;
    }
 
    QString CFlightPlanRemarks::replaceRemark(const QString &remarks, const QString &marker, const QString &newRemark)
    {
        QString r(remarks);
        const int maxIndex = remarks.size() - 1;
        int f = remarks.indexOf(marker);
        if (f >= 0)
        {
            f += marker.length();
            if (maxIndex <= f) { return remarks; }
            thread_local const QRegularExpression nextMarker("\\s+\\w*/|$");
            int to1 = remarks.indexOf(nextMarker, f + 1); // for case 2,3
            if (to1 < 0) { to1 = maxIndex + 1; }
            int to2 = remarks.indexOf('/', f + 1); // for case 1
            if (to2 < 0) { to2 = maxIndex + 1; } // no more end markers, ends after last character
            const int to = qMin(to1, to2);
            r.remove(f, to - f);
        }
        return r.isEmpty() ? newRemark : r % u" " % newRemark;
    }
 
    const QStringList &CFlightPlan::getLogCategories()
    {
        static const QStringList cats { CLogCategories::flightPlan() };
        return cats;
    }
 
    CFlightPlan::CFlightPlan(const CCallsign &callsign, const CFlightPlanAircraftInfo &aircraftInfo,
                             const CAirportIcaoCode &originAirportIcao, const CAirportIcaoCode &destinationAirportIcao,
                             const CAirportIcaoCode &alternateAirportIcao, const QDateTime &takeoffTimePlanned,
                             const QDateTime &takeoffTimeActual, const physical_quantities::CTime &enrouteTime,
                             const physical_quantities::CTime &fuelTime, const CAltitude &cruiseAltitude,
                             const physical_quantities::CSpeed &cruiseTrueAirspeed,
                             CFlightPlan::FlightRules flightRules, const QString &route, const QString &remarks)
        : m_callsign(callsign), m_aircraftInfo(aircraftInfo), m_originAirportIcao(originAirportIcao),
          m_destinationAirportIcao(destinationAirportIcao), m_alternateAirportIcao(alternateAirportIcao),
          m_takeoffTimePlanned(takeoffTimePlanned), m_takeoffTimeActual(takeoffTimeActual), m_enrouteTime(enrouteTime),
          m_fuelTime(fuelTime), m_cruiseAltitude(cruiseAltitude), m_cruiseTrueAirspeed(cruiseTrueAirspeed),
          m_flightRules(flightRules), m_route(route.trimmed().left(MaxRouteLength).toUpper()),
          m_remarks(remarks.trimmed().left(MaxRemarksLength).toUpper())
    {
        m_callsign.setTypeHint(CCallsign::Aircraft);
        m_enrouteTime.switchUnit(swift::misc::physical_quantities::CTimeUnit::hrmin());
        m_fuelTime.switchUnit(swift::misc::physical_quantities::CTimeUnit::hrmin());
    }
 
    void CFlightPlan::setCallsign(const CCallsign &callsign)
    {
        m_callsign = callsign;
        m_callsign.setTypeHint(CCallsign::Aircraft);
    }
 
    void CFlightPlan::setAircraftInfo(const CFlightPlanAircraftInfo &aircraftInfo) { m_aircraftInfo = aircraftInfo; }
 
    void CFlightPlan::setTakeoffTimePlanned(const QDateTime &takeoffTimePlanned)
    {
        m_takeoffTimePlanned = takeoffTimePlanned.toUTC();
    }
 
    void CFlightPlan::setTakeoffTimeActual(const QDateTime &takeoffTimeActual)
    {
        m_takeoffTimeActual = takeoffTimeActual.toUTC();
    }
 
    void CFlightPlan::setFlightRule(const QString &flightRule)
    {
        const CFlightPlan::FlightRules r = CFlightPlan::stringToFlightRules(flightRule);
        this->setFlightRule(r);
    }
 
    void CFlightPlan::setRoute(const QString &route)
    {
        QString r = route;
        r.replace(':', ' ');
        m_route = asciiOnlyString(r).left(MaxRouteLength).toUpper();
    }
 
    void CFlightPlan::setRemarks(const QString &remarks) { m_remarks = CFlightPlanRemarks(remarks, true); }
 
    void CFlightPlan::setVoiceCapabilities(const QString &capabilities)
    {
        const CVoiceCapabilities vc = CVoiceCapabilities::fromText(capabilities);
        m_remarks.setVoiceCapabilities(vc);
    }
 
    QString CFlightPlan::getTakeoffTimePlannedHourMin() const { return m_takeoffTimePlanned.toString("hh:mm"); }
 
    QString CFlightPlan::getTakeoffTimeActualHourMin() const { return m_takeoffTimeActual.toString("hh:mm"); }
 
    QVariant CFlightPlan::propertyByIndex(CPropertyIndexRef index) const
    {
        if (index.isMyself()) { return QVariant::fromValue(*this); }
        if (ITimestampBased::canHandleIndex(index)) { return ITimestampBased::propertyByIndex(index); }
 
        const ColumnIndex i = index.frontCasted<ColumnIndex>();
        switch (i)
        {
        case IndexAlternateAirportIcao: return m_alternateAirportIcao.propertyByIndex(index.copyFrontRemoved());
        case IndexDestinationAirportIcao: return m_destinationAirportIcao.propertyByIndex(index.copyFrontRemoved());
        case IndexOriginAirportIcao: return m_originAirportIcao.propertyByIndex(index.copyFrontRemoved());
        case IndexCallsign: return m_callsign.propertyByIndex(index.copyFrontRemoved());
        case IndexRemarks: return QVariant::fromValue(m_remarks);
        default: return CValueObject::propertyByIndex(index);
        }
    }
 
    void CFlightPlan::setPropertyByIndex(CPropertyIndexRef index, const QVariant &variant)
    {
        if (index.isMyself())
        {
            (*this) = variant.value<CFlightPlan>();
            return;
        }
        if (ITimestampBased::canHandleIndex(index))
        {
            ITimestampBased::setPropertyByIndex(index, variant);
            return;
        }
 
        const ColumnIndex i = index.frontCasted<ColumnIndex>();
        switch (i)
        {
        case IndexAlternateAirportIcao:
            m_alternateAirportIcao.setPropertyByIndex(index.copyFrontRemoved(), variant);
            break;
        case IndexDestinationAirportIcao:
            m_destinationAirportIcao.setPropertyByIndex(index.copyFrontRemoved(), variant);
            break;
        case IndexOriginAirportIcao: m_originAirportIcao.setPropertyByIndex(index.copyFrontRemoved(), variant); break;
        case IndexCallsign: m_callsign.setPropertyByIndex(index.copyFrontRemoved(), variant); break;
        case IndexRemarks: this->setRemarks(variant.toString()); break;
        default: CValueObject::setPropertyByIndex(index, variant); break;
        }
    }
 
    QString CFlightPlan::convertToQString(bool i18n) const { return this->buildString(i18n, " "); }
 
    QString CFlightPlan::asHTML(bool i18n) const { return this->buildString(i18n, "<br>"); }
 
    QString CFlightPlan::buildString(bool i18n, const QString &separator) const
    {
        const QString s =
            m_callsign.toQString(i18n) % u" aircraft: " % m_aircraftInfo.asIcaoString() % separator % u"origin: " %
            m_originAirportIcao.toQString(i18n) % u" destination: " % m_destinationAirportIcao.toQString(i18n) %
            u" alternate: " % m_alternateAirportIcao.toQString(i18n) % separator % u"takeoff planed: " %
            m_takeoffTimePlanned.toString("ddhhmm") % u" actual: " % m_takeoffTimeActual.toString("ddhhmm") %
            separator % u"enroute time: " % m_enrouteTime.toQString(i18n) % u" fuel time:" %
            m_fuelTime.toQString(i18n) % separator % u"altitude: " % m_cruiseAltitude.toQString(i18n) % u" speed: " %
            m_cruiseTrueAirspeed.toQString(i18n) % separator % u"route: " % m_route % separator % u"remarks: " %
            this->getRemarks();
        return s;
    }
 
    CFlightPlan CFlightPlan::fromSB4Format(const QString &sbData)
    {
        if (sbData.isEmpty()) { return CFlightPlan(); }
        CFlightPlan fp;
        const QMap<QString, QString> values = parseIniValues(sbData);
        const QString altStr = values.value("Altitude");
        const CAltitude alt(altStr.length() < 4 ? "FL" + altStr : altStr + "ft");
 
        const QString type = values.value("Type"); // IFR/VFR
        fp.setFlightRule(type == "0" ? IFR : VFR);
 
        const int fuelMins = values.value("FuelMinutes").toInt() + 60 * values.value("FuelHours").toInt();
        const CTime fuelTime(fuelMins, CTimeUnit::min());
 
        const int enrouteMins = values.value("FlightMinutes").toInt() + 60 * values.value("FlightHours").toInt();
        const CTime enrouteTime(enrouteMins, CTimeUnit::min());
 
        fp.setOriginAirportIcao(values.value("Departure"));
        fp.setDestinationAirportIcao(values.value("Arrival"));
        fp.setAlternateAirportIcao(values.value("Alternate"));
        fp.setRemarks(values.value("Remarks"));
        fp.setRoute(values.value("Route"));
 
        fp.setCruiseAltitude(alt);
        fp.setFuelTime(fuelTime);
        fp.setEnrouteTime(enrouteTime);
 
        fp.setTakeoffTimePlanned(QDateTime::currentDateTimeUtc());
 
        int airspeedKts = values.value("Airspeed").toInt();
        const CSpeed airspeed(airspeedKts, CSpeedUnit::kts());
        fp.setCruiseTrueAirspeed(airspeed);
 
        // Ignoring Heavy flag
 
        return fp;
    }
 
    CFlightPlan CFlightPlan::fromSimBriefFormat(const QString &simBrief)
    {
        if (simBrief.isEmpty()) { return CFlightPlan(); }
        CFlightPlan fp;
        QDomDocument doc;
        doc.setContent(simBrief);
        const QDomNodeList originList = doc.elementsByTagName("origin");
        if (!originList.isEmpty())
        {
            const QDomNode origin = originList.at(0);
            const QString icao = origin.firstChildElement("icao_code").text();
            fp.setOriginAirportIcao(icao);
        }
        const QDomNodeList destList = doc.elementsByTagName("destination");
        if (!destList.isEmpty())
        {
            const QDomNode dest = destList.at(0);
            const QString icao = dest.firstChildElement("icao_code").text();
            fp.setDestinationAirportIcao(icao);
        }
        const QDomNodeList altList = doc.elementsByTagName("alternate");
        if (!altList.isEmpty())
        {
            const QDomNode alternate = altList.at(0);
            const QString icao = alternate.firstChildElement("icao_code").text();
            fp.setAlternateAirportIcao(icao);
        }
        const QDomNodeList generalList = doc.elementsByTagName("general");
        if (!generalList.isEmpty())
        {
            bool ok;
            const QDomNode general = generalList.at(0);
            QString route = general.firstChildElement("route").text();
            fp.setRoute(route.remove("DCT").simplified().trimmed());
            const QString airline = general.firstChildElement("icao_airline").text();
            const QString flightNumber = general.firstChildElement("flight_number").text();
            fp.setCallsign(CCallsign(airline + flightNumber, CCallsign::Aircraft));
            const QString cruiseAlt = general.firstChildElement("initial_altitude").text();
            const int cruiseAltFt = cruiseAlt.toInt(&ok);
            if (ok)
            {
                CAltitude ca(cruiseAltFt, CAltitude::MeanSeaLevel, CLengthUnit::ft());
                if (cruiseAlt.endsWith("00") && cruiseAltFt > 5000) { ca.toFlightLevel(); }
                fp.setCruiseAltitude(ca);
                if (cruiseAltFt >= 10000) { fp.setFlightRule(CFlightPlan::IFR); } // good guess
                else { fp.setFlightRule(CFlightPlan::VFR); }
            }
            else { fp.setCruiseAltitudeString(cruiseAlt); }
            const QString tas = general.firstChildElement("cruise_tas").text();
            const int tasKts = tas.toInt(&ok);
            if (ok) { fp.setCruiseTrueAirspeed(CSpeed(tasKts, CSpeedUnit::kts())); }
        }
 
        const QDomNodeList timeList = doc.elementsByTagName("times");
        if (!timeList.isEmpty())
        {
            bool ok;
            const QDomNode times = timeList.at(0);
            const QString enroute = times.firstChildElement("est_time_enroute").text();
            const int enrouteSecs = enroute.toInt(&ok);
            if (ok) { fp.setEnrouteTime(CTime(enrouteSecs, CTimeUnit::s())); }
            const QString endurance = times.firstChildElement("endurance").text();
            const int enduranceSecs = endurance.toInt(&ok);
            if (ok) { fp.setFuelTime(CTime(enduranceSecs, CTimeUnit::s())); }
            const QString depTime = times.firstChildElement("sched_out").text();
            const int depTimeUnixTs = depTime.toInt(&ok);
            if (ok)
            {
                QDateTime depTs = QDateTime::fromSecsSinceEpoch(depTimeUnixTs, QTimeZone::utc());
                depTs.setTimeZone(QTimeZone::utc());
                fp.setTakeoffTimePlanned(depTs);
            }
        }
 
        const QDomNodeList aircraftList = doc.elementsByTagName("aircraft");
        if (!aircraftList.isEmpty())
        {
            const QDomNode aircraft = aircraftList.at(0);
            const QString equipment = aircraft.firstChildElement("equip").text();
            // H-SDE2E3GHIJ1J3J4J5LM1ORWXY/LB1D1
            const int b = equipment.indexOf('-');
            const int e = equipment.indexOf('/');
 
            if (e > b && e >= 0 && b >= 0 && equipment.size() > e)
            {
                // Do not read aircraft ICAO code as this is read/overwritten from the simulator
 
                const QChar wtcChar = equipment.mid(0, 1).at(0);
                const CWakeTurbulenceCategory wtc(wtcChar);
 
                const QString comNavEquipmentString = equipment.mid(b + 1, e - b - 1);
                const CComNavEquipment comNavEquipment(comNavEquipmentString);
 
                const QString ssrEquipmentString = equipment.mid(e + 1);
                const CSsrEquipment ssrEquipment(ssrEquipmentString);
 
                const CFlightPlanAircraftInfo info(fp.getAircraftInfo().getAircraftIcao(), comNavEquipment,
                                                   ssrEquipment, wtc);
                fp.setAircraftInfo(info);
            }
 
            CFlightPlanRemarks r = fp.getFlightPlanRemarks();
            bool remarksChanged = false;
            const QString selcal = aircraft.firstChildElement("selcal").text();
            if (selcal.length() == 4)
            {
                const bool c = r.setSelcalCode(selcal);
                remarksChanged = c || remarksChanged;
            }
 
            if (remarksChanged) { fp.setFlightPlanRemarks(r); }
        }
 
        return fp;
    }
 
    CFlightPlan CFlightPlan::fromMultipleFormats(const QString &data, const QString &fileSuffix)
    {
        if (data.isEmpty()) { return CFlightPlan(); }
        if (fileSuffix.contains("xml", Qt::CaseInsensitive))
        {
            if (data.contains("<OFP>", Qt::CaseInsensitive) && data.contains("<general>", Qt::CaseInsensitive))
            {
                return CFlightPlan::fromSimBriefFormat(data);
            }
        }
 
        if (data.contains("[SBFlightPlan]", Qt::CaseInsensitive)) { return CFlightPlan::fromSB4Format(data); }
        return CFlightPlan::fromJson(data);
    }
 
    CFlightPlan CFlightPlan::loadFromMultipleFormats(const QString &fileName, CStatusMessageList *msgs)
    {
        try
        {
            QFileInfo fi(fileName);
            if (fileName.isEmpty())
            {
                if (msgs)
                {
                    msgs->push_back(
                        CStatusMessage(static_cast<CFlightPlan *>(nullptr)).validationError(u"No file name"));
                }
                return CFlightPlan();
            }
            else
            {
                if (!fi.exists())
                {
                    if (msgs)
                    {
                        msgs->push_back(CStatusMessage(static_cast<CFlightPlan *>(nullptr))
                                            .validationError(u"File '%1' does not exist")
                                        << fileName);
                    }
                    return CFlightPlan();
                }
            }
 
            const QString data = CFileUtils::readFileToString(fileName);
            if (data.isEmpty())
            {
                if (msgs)
                {
                    msgs->push_back(CStatusMessage(static_cast<CFlightPlan *>(nullptr))
                                        .validationError(u"File '%1' does not contain data")
                                    << fileName);
                }
                return CFlightPlan();
            }
 
            if (fileName.endsWith(".sfp", Qt::CaseInsensitive)) { return CFlightPlan::fromSB4Format(data); }
            if (fileName.endsWith(".json", Qt::CaseInsensitive))
            {
                do {
                    CStatusMessage m;
                    if (!json::looksLikeSwiftJson(data))
                    {
                        m = CStatusMessage(static_cast<CFlightPlan *>(nullptr), CStatusMessage::SeverityWarning,
                                           u"Reading '%1' yields no data", true)
                            << fileName;
                        if (msgs) { msgs->push_back(m); }
                        break;
                    }
 
                    try
                    {
                        const QJsonObject jsonObject = json::jsonObjectFromString(data);
                        if (json::looksLikeSwiftTypeValuePairJson(jsonObject))
                        {
                            // CVariant format
                            CVariant variant;
                            variant.convertFromJson(jsonObject);
                            if (variant.canConvert<CFlightPlan>())
                            {
                                const CFlightPlan fp = variant.value<CFlightPlan>();
                                return fp;
                            }
                            else
                            {
                                m = CStatusMessage(static_cast<CFlightPlan *>(nullptr), CStatusMessage::SeverityWarning,
                                                   u"Wrong format for flight plan in '%1'")
                                    << fileName;
                                if (msgs) { msgs->push_back(m); }
                            }
                        }
                        else
                        {
                            const CFlightPlan fp = CFlightPlan::fromJson(jsonObject);
                            return fp;
                        }
                    }
                    catch (const CJsonException &ex)
                    {
                        m = CStatusMessage::fromJsonException(ex, static_cast<CFlightPlan *>(nullptr),
                                                              "Parse error in " + fileName);
                        if (msgs) { msgs->push_back(m); }
                        break;
                    }
                }
                while (false);
            }
 
            return CFlightPlan::fromMultipleFormats(data, fi.suffix());
        }
        catch (const CJsonException &ex)
        {
            if (msgs)
            {
                msgs->push_back(CStatusMessage::fromJsonException(
                    ex, static_cast<CFlightPlan *>(nullptr),
                    QStringLiteral("Parsing flight plan from '%1' failed.").arg(fileName)));
            }
        }
        return CFlightPlan();
    }
 
    const QString &CFlightPlan::flightRulesToString(CFlightPlan::FlightRules rules)
    {
        static const QString v("VFR");
        static const QString i("IFR");
        static const QString s("SVFR");
        static const QString d("DVFR");
        static const QString unknown("???");
 
        switch (rules)
        {
        case VFR: return v;
        case IFR: return i;
        case SVFR: return s;
        case DVFR: return d;
        case UNKNOWN:
        default: break;
        }
        return unknown;
    }
 
    CFlightPlan::FlightRules CFlightPlan::stringToFlightRules(const QString &flightRules)
    {
        if (flightRules.length() < 3) { return UNKNOWN; }
        const QString fr(flightRules.toUpper().trimmed());
        if (fr.startsWith("DVFR")) { return DVFR; }
        if (fr.startsWith("SVFR")) { return SVFR; }
        if (fr.startsWith("VFR")) { return VFR; }
        if (fr.startsWith("IFR")) { return IFR; }
        return UNKNOWN;
    }
 
    const QStringList &CFlightPlan::flightRules()
    {
        static const QStringList r({ "IFR", "VFR", "SVFR", "DVFR" });
        return r;
    }
 
    bool CFlightPlan::isVFRRules(CFlightPlan::FlightRules rule)
    {
        return rule == CFlightPlan::VFR || rule == CFlightPlan::DVFR || rule == CFlightPlan::SVFR;
    }
 
    bool CFlightPlan::isVFRRules(const QString &rule)
    {
        const CFlightPlan::FlightRules r = CFlightPlan::stringToFlightRules(rule);
        return CFlightPlan::isVFRRules(r);
    }
 
    bool CFlightPlan::isIFRRules(CFlightPlan::FlightRules rule) { return rule == CFlightPlan::IFR; }
 
    bool CFlightPlan::isIFRRules(const QString &rule)
    {
        const CFlightPlan::FlightRules r = CFlightPlan::stringToFlightRules(rule);
        return CFlightPlan::isIFRRules(r);
    }
 
    CIcons::IconIndex CFlightPlan::toIcon() const { return CIcons::StandardIconAppFlightPlan16; }
 
} // namespace swift::misc::aviation