airspacemonitor.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 "core/airspacemonitor.h"
 
#include <QDateTime>
#include <QTime>
#include <QVariant>
#include <Qt>
 
#include "config/buildconfig.h"
#include "core/aircraftmatcher.h"
#include "core/airspaceanalyzer.h"
#include "core/application.h"
#include "core/context/contextnetwork.h"
#include "core/fsd/fsdclient.h"
#include "core/vatsim/vatsimdatafilereader.h"
#include "core/webdataservices.h"
#include "misc/aviation/aircraftparts.h"
#include "misc/aviation/aircraftsituation.h"
#include "misc/aviation/comsystem.h"
#include "misc/aviation/modulator.h"
#include "misc/aviation/transponder.h"
#include "misc/eventloop.h"
#include "misc/geo/elevationplane.h"
#include "misc/iterator.h"
#include "misc/logmessage.h"
#include "misc/mixin/mixincompare.h"
#include "misc/network/user.h"
#include "misc/network/voicecapabilities.h"
#include "misc/pq/units.h"
#include "misc/propertyindexvariantmap.h"
#include "misc/range.h"
#include "misc/sequence.h"
#include "misc/statusmessagelist.h"
#include "misc/test/testing.h"
#include "misc/threadutils.h"
#include "misc/variant.h"
#include "misc/verify.h"
#include "misc/worker.h"
 
using namespace swift::config;
using namespace swift::misc;
using namespace swift::misc::aviation;
using namespace swift::misc::geo;
using namespace swift::misc::simulation;
using namespace swift::misc::test;
using namespace swift::misc::json;
using namespace swift::misc::network;
using namespace swift::misc::physical_quantities;
using namespace swift::misc::weather;
using namespace swift::core::fsd;
using namespace swift::core::vatsim;
 
namespace swift::core
{
    CAirspaceMonitor::CAirspaceMonitor(IOwnAircraftProvider *ownAircraftProvider,
                                       IAircraftModelSetProvider *modelSetProvider, CFSDClient *fsdClient,
                                       QObject *parent)
        : CRemoteAircraftProvider(parent), COwnAircraftAware(ownAircraftProvider), m_modelSetProvider(modelSetProvider),
          m_fsdClient(fsdClient), m_analyzer(new CAirspaceAnalyzer(ownAircraftProvider, m_fsdClient, this))
    {
        this->setObjectName("CAirspaceMonitor");
        this->enableReverseLookupMessages(sApp->isDeveloperFlagSet() || CBuildConfig::isLocalDeveloperDebugBuild() ?
                                              RevLogEnabled :
                                              RevLogEnabledSimplified);
 
        // FSD runs in its own thread!
        connect(m_fsdClient, &CFSDClient::atcDataUpdateReceived, this, &CAirspaceMonitor::onAtcPositionUpdate);
        connect(m_fsdClient, &CFSDClient::atisReplyReceived, this, &CAirspaceMonitor::onAtisReceived);
        connect(m_fsdClient, &CFSDClient::atisLogoffTimeReplyReceived, this,
                &CAirspaceMonitor::onAtisLogoffTimeReceived);
        connect(m_fsdClient, &CFSDClient::flightPlanReceived, this, &CAirspaceMonitor::onFlightPlanReceived);
        connect(m_fsdClient, &CFSDClient::realNameResponseReceived, this, &CAirspaceMonitor::onRealNameReplyReceived);
        connect(m_fsdClient, &CFSDClient::planeInformationReceived, this, &CAirspaceMonitor::onIcaoCodesReceived);
        connect(m_fsdClient, &CFSDClient::deletePilotReceived, this, &CAirspaceMonitor::onPilotDisconnected);
        connect(m_fsdClient, &CFSDClient::deleteAtcReceived, this, &CAirspaceMonitor::onAtcControllerDisconnected);
        connect(m_fsdClient, &CFSDClient::pilotDataUpdateReceived, this, &CAirspaceMonitor::onAircraftUpdateReceived);
        connect(m_fsdClient, &CFSDClient::interimPilotDataUpdatedReceived, this,
                &CAirspaceMonitor::onAircraftInterimUpdateReceived);
        connect(m_fsdClient, &CFSDClient::visualPilotDataUpdateReceived, this,
                &CAirspaceMonitor::onAircraftVisualUpdateReceived);
        connect(m_fsdClient, &CFSDClient::euroscopeSimDataUpdatedReceived, this,
                &CAirspaceMonitor::onAircraftSimDataUpdateReceived);
        connect(m_fsdClient, &CFSDClient::com1FrequencyResponseReceived, this, &CAirspaceMonitor::onFrequencyReceived);
        connect(m_fsdClient, &CFSDClient::capabilityResponseReceived, this,
                &CAirspaceMonitor::onCapabilitiesReplyReceived);
        connect(m_fsdClient, &CFSDClient::planeInformationFsinnReceived, this,
                &CAirspaceMonitor::onCustomFSInnPacketReceived);
        connect(m_fsdClient, &CFSDClient::serverResponseReceived, this, &CAirspaceMonitor::onServerReplyReceived);
        connect(m_fsdClient, &CFSDClient::aircraftConfigReceived, this, &CAirspaceMonitor::onAircraftConfigReceived);
        connect(m_fsdClient, &CFSDClient::connectionStatusChanged, this, &CAirspaceMonitor::onConnectionStatusChanged);
 
        Q_ASSERT_X(sApp && sApp->hasWebDataServices(), Q_FUNC_INFO, "Missing data reader");
 
        if (this->supportsVatsimDataFile())
        {
            connect(sApp->getWebDataServices()->getVatsimDataFileReader(), &CVatsimDataFileReader::dataFileRead, this,
                    &CAirspaceMonitor::onReceivedVatsimDataFile);
        }
 
        // Force snapshot in the main event loop
        connect(m_analyzer, &CAirspaceAnalyzer::airspaceAircraftSnapshot, this,
                &CAirspaceMonitor::airspaceAircraftSnapshot, Qt::QueuedConnection);
 
        // Analyzer
        connect(m_analyzer, &CAirspaceAnalyzer::timeoutAircraft, this, &CAirspaceMonitor::onPilotDisconnected,
                Qt::QueuedConnection);
        connect(m_analyzer, &CAirspaceAnalyzer::timeoutAtc, this, &CAirspaceMonitor::onAtcControllerDisconnected,
                Qt::QueuedConnection);
 
        // timers
        connect(&m_fastProcessTimer, &QTimer::timeout, this, &CAirspaceMonitor::fastProcessing);
        connect(&m_slowProcessTimer, &QTimer::timeout, this, &CAirspaceMonitor::slowProcessing);
        m_fastProcessTimer.start(FastProcessIntervalMs);
        m_slowProcessTimer.start(SlowProcessIntervalMs);
 
        // dot command
        CAirspaceMonitor::registerHelp();
    }
 
    bool CAirspaceMonitor::updateFastPositionEnabled(const CCallsign &callsign, bool enableFastPositonUpdates)
    {
        const bool r = CRemoteAircraftProvider::updateFastPositionEnabled(callsign, enableFastPositonUpdates);
        if (m_fsdClient && sApp && !sApp->isShuttingDown())
        {
            // thread safe update of m_network
            const QPointer<CAirspaceMonitor> myself(this);
            QTimer::singleShot(0, m_fsdClient, [=, this] {
                if (!myself) { return; }
                if (m_fsdClient)
                {
                    if (enableFastPositonUpdates) { m_fsdClient->addInterimPositionReceiver(callsign); }
                    else { m_fsdClient->removeInterimPositionReceiver(callsign); }
                }
            });
        }
        return r;
    }
 
    const QStringList &CAirspaceMonitor::getLogCategories()
    {
        static const QStringList cats { CLogCategories::matching(), CLogCategories::network() };
        return cats;
    }
 
    CAirspaceAircraftSnapshot CAirspaceMonitor::getLatestAirspaceAircraftSnapshot() const
    {
        Q_ASSERT_X(m_analyzer, Q_FUNC_INFO, "No analyzer");
        return m_analyzer->getLatestAirspaceAircraftSnapshot();
    }
 
    CFlightPlan CAirspaceMonitor::loadFlightPlanFromNetwork(const CCallsign &callsign)
    {
        CFlightPlan plan;
        QPointer<CAirspaceMonitor> myself(this);
 
        // use cache, but not for own callsign (always reload)
        if (m_flightPlanCache.contains(callsign)) { plan = m_flightPlanCache[callsign]; }
        const bool ownAircraft = this->getOwnCallsign() == callsign;
        if (ownAircraft || !plan.wasSentOrLoaded() || plan.timeDiffSentOrLoadedMs() > 30 * 1000)
        {
            // outdated, or not in cache at all, or NOT own aircraft
            plan = CFlightPlan(); // reset
            m_flightPlanCache.remove(callsign); // loading FP from network
            m_fsdClient->sendClientQueryFlightPlan(callsign);
 
            // with this little trick we try to make an asynchronous signal / slot based approach
            // a synchronous return value
            CEventLoop eventLoop(this);
            eventLoop.stopWhen(m_fsdClient, &CFSDClient::flightPlanReceived,
                               [=](const auto &cs, const auto &) { return cs == callsign; });
            if (eventLoop.exec(1500))
            {
                if (!myself || !sApp || sApp->isShuttingDown()) // cppcheck-suppress knownConditionTrueFalse
                {
                    return {};
                }
                if (m_flightPlanCache.contains(callsign)) { plan = m_flightPlanCache[callsign]; }
            }
        }
        return plan;
    }
 
    CFlightPlanRemarks CAirspaceMonitor::tryToGetFlightPlanRemarks(const CCallsign &callsign) const
    {
        if (callsign.isEmpty()) { return {}; }
 
        // full flight plan's remarks
        if (m_flightPlanCache.contains(callsign)) { return m_flightPlanCache[callsign].getFlightPlanRemarks(); }
 
        // remarks only
        if (this->supportsVatsimDataFile())
        {
            return sApp->getWebDataServices()->getVatsimDataFileReader()->getFlightPlanRemarksForCallsign(callsign);
        }
 
        // unsupported
        return {};
    }
 
    CAtcStationList CAirspaceMonitor::getAtcStationsOnlineRecalculated()
    {
        m_atcStationsOnline.calculcateAndUpdateRelativeDistanceAndBearing(this->getOwnAircraftSituation());
        return m_atcStationsOnline;
    }
 
    CUserList CAirspaceMonitor::getUsers() const
    {
        CUserList users;
        for (const CAtcStation &station : m_atcStationsOnline)
        {
            CUser user = station.getController();
            if (!user.hasCallsign()) { user.setCallsign(station.getCallsign()); }
            users.push_back(user);
        }
        for (const CSimulatedAircraft &aircraft : this->getAircraftInRange())
        {
            CUser user = aircraft.getPilot();
            if (!user.hasCallsign()) { user.setCallsign(aircraft.getCallsign()); }
            users.push_back(user);
        }
        return users;
    }
 
    CUserList CAirspaceMonitor::getUsersForCallsigns(const CCallsignSet &callsigns) const
    {
        CUserList users;
        if (callsigns.isEmpty()) { return users; }
        CCallsignSet searchList(callsigns);
 
        // myself, which is not in the lists below
        const CSimulatedAircraft myAircraft(getOwnAircraft());
        if (!myAircraft.getCallsign().isEmpty() && searchList.contains(myAircraft.getCallsign()))
        {
            searchList.remove(myAircraft.getCallsign());
            users.push_back(myAircraft.getPilot());
        }
 
        // do aircraft first, this will handle most callsigns
        for (const CSimulatedAircraft &aircraft : this->getAircraftInRange())
        {
            if (searchList.isEmpty()) { break; }
            const CCallsign callsign = aircraft.getCallsign();
            if (searchList.contains(callsign))
            {
                const CUser user = aircraft.getPilot();
                users.push_back(user);
                searchList.remove(callsign);
            }
        }
 
        for (const CAtcStation &station : m_atcStationsOnline)
        {
            if (searchList.isEmpty()) { break; }
            const CCallsign callsign = station.getCallsign();
            if (searchList.contains(callsign))
            {
                const CUser user = station.getController();
                users.push_back(user);
                searchList.remove(callsign);
            }
        }
 
        // we might have unresolved callsigns
        // those are the ones not in range
        for (const CCallsign &callsign : std::as_const(searchList))
        {
            const CUserList usersByCallsign = sApp->getWebDataServices()->getUsersForCallsign(callsign);
            if (usersByCallsign.isEmpty())
            {
                const CUser user(callsign);
                users.push_back(user);
            }
            else { users.push_back(usersByCallsign[0]); }
        }
        return users;
    }
 
    CAtcStation CAirspaceMonitor::getAtcStationForComUnit(const CComSystem &comSystem) const
    {
        CAtcStationList stations = m_atcStationsOnline.findIfComUnitTunedInChannelSpacing(comSystem);
        if (stations.isEmpty()) { return {}; }
        stations.sortByDistanceToReferencePosition();
        return stations.front();
    }
 
    void CAirspaceMonitor::requestAircraftDataUpdates()
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        const CSimulatedAircraftList aircraftInRange(this->getAircraftInRange());
        for (const CSimulatedAircraft &aircraft : aircraftInRange)
        {
            // staggered version
            const CCallsign cs(aircraft.getCallsign());
            if (!m_queryPilot.contains(cs)) { m_queryPilot.enqueue(aircraft.getCallsign()); }
        }
    }
 
    void CAirspaceMonitor::requestAtisUpdates()
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        const CAtcStationList stations(this->getAtcStationsOnline());
        for (const CAtcStation &station : stations)
        {
            const CCallsign cs = station.getCallsign();
            if (!m_queryAtis.contains(cs)) { m_queryAtis.enqueue(cs); }
        }
    }
 
    void CAirspaceMonitor::testCreateDummyOnlineAtcStations(int number)
    {
        if (number < 1) { return; }
        m_atcStationsOnline.push_back(CTesting::createAtcStations(number));
        emit this->changedAtcStationsOnline();
    }
 
    void CAirspaceMonitor::testAddAircraftParts(const CCallsign &callsign, const CAircraftParts &parts,
                                                bool incremental)
    {
        this->onAircraftConfigReceived(callsign, incremental ? parts.toIncrementalJson() : parts.toFullJson(), 5000);
    }
 
    const QString &CAirspaceMonitor::enumFlagToString(CAirspaceMonitor::MatchingReadinessFlag r)
    {
        static const QString nr("not ready");
        static const QString icao("rec. ICAO");
        static const QString fsinn("rec. FsInn");
        static const QString ready("ready sent");
        static const QString rec("recursive");
        switch (r)
        {
        case NotReady: return nr;
        case ReceivedIcaoCodes: return icao;
        case ReceivedFsInnPacket: return fsinn;
        case ReadyForMatchingSent: return ready;
        case RecursiveCall: return rec;
        default: break;
        }
        static const QString unknown("????");
        return unknown;
    }
 
    QString CAirspaceMonitor::enumToString(MatchingReadiness r)
    {
        QStringList s;
        if (r.testFlag(NotReady)) { s << enumFlagToString(NotReady); }
        if (r.testFlag(ReceivedIcaoCodes)) { s << enumFlagToString(ReceivedIcaoCodes); }
        if (r.testFlag(ReceivedFsInnPacket)) { s << enumFlagToString(ReceivedFsInnPacket); }
        if (r.testFlag(ReadyForMatchingSent)) { s << enumFlagToString(ReadyForMatchingSent); }
        if (r.testFlag(RecursiveCall)) { s << enumFlagToString(RecursiveCall); }
        return s.join(", ");
    }
 
    bool CAirspaceMonitor::parseCommandLine(const QString &commandLine, const CIdentifier &originator)
    {
        Q_UNUSED(originator;)
        if (commandLine.isEmpty()) { return false; }
        static const QStringList cmds({ ".fsd" });
        CSimpleCommandParser parser(cmds);
        parser.parse(commandLine);
        if (!parser.isKnownCommand()) { return false; }
        if (parser.matchesCommand(".fsd"))
        {
            if (parser.countParts() < 2) { return false; }
            if (parser.matchesPart(1, "range") && parser.countParts() > 2)
            {
                const QString r = parser.part(2);
                const CLength d = CLength::parsedFromString(r);
                this->setMaxRange(d);
            }
        }
        return false;
    }
 
    void CAirspaceMonitor::fastProcessing()
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        // only send one query
        const bool send = this->sendNextStaggeredAtisQuery();
        if (!send) { this->sendNextStaggeredPilotDataQuery(); }
    }
 
    void CAirspaceMonitor::slowProcessing()
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        this->queryAllOnlineAtcStations();
    }
 
    void CAirspaceMonitor::clear()
    {
        m_flightPlanCache.clear();
        m_tempFsInnPackets.clear();
        m_readiness.clear();
        this->removeAllOnlineAtcStations();
        this->removeAllAircraft();
        this->clearClients();
 
        m_foundInNonMovingAircraft = 0;
        m_foundInElevationsOnGnd = 0;
    }
 
    void CAirspaceMonitor::gracefulShutdown() { QObject::disconnect(this); }
 
    int CAirspaceMonitor::reInitializeAllAircraft()
    {
        const CSimulatedAircraftList aircraft = this->getAircraftInRange();
        CRemoteAircraftProvider::removeAllAircraft();
        this->asyncReInitializeAllAircraft(aircraft, true);
        return aircraft.size();
    }
 
    void CAirspaceMonitor::setMaxRange(const CLength &range)
    {
        if (range.isNull() || range.isNegativeWithEpsilonConsidered() || range.isZeroEpsilonConsidered())
        {
            // off
            m_maxDistanceNM = -1;
            m_maxDistanceNMHysteresis = -1;
            CLogMessage(this).info(u"No airspace range restriction");
            return;
        }
 
        const int rIntNM = range.valueInteger(CLengthUnit::NM());
        CLogMessage(this).info(u"Set airspace max. range to %1NM") << rIntNM;
        m_maxDistanceNM = rIntNM;
        m_maxDistanceNMHysteresis = qRound(rIntNM * 1.1);
    }
 
    void CAirspaceMonitor::onRealNameReplyReceived(const CCallsign &callsign, const QString &realname)
    {
        if (!this->isConnectedAndNotShuttingDown() || realname.isEmpty()) { return; }
        if (!sApp || sApp->isShuttingDown() || !sApp->getWebDataServices()) { return; }
 
        bool wasAtc = false;
        const QString rn = CUser::beautifyRealName(realname);
 
        if (callsign.hasSuffix())
        {
            // very likely and ATC callsign
            const CPropertyIndexVariantMap vm =
                CPropertyIndexVariantMap({ CAtcStation::IndexController, CUser::IndexRealName }, rn);
            const int c1 = this->updateOnlineStation(callsign, vm, false, true);
            wasAtc = c1 > 0;
        }
 
        if (!wasAtc)
        {
            const CPropertyIndexVariantMap vm =
                CPropertyIndexVariantMap({ CSimulatedAircraft::IndexPilot, CUser::IndexRealName }, rn);
            this->updateAircraftInRange(callsign, vm);
        }
 
        // Client
        const CVoiceCapabilities voiceCaps = sApp->getWebDataServices()->getVoiceCapabilityForCallsign(callsign);
        CPropertyIndexVariantMap vm = CPropertyIndexVariantMap({ CClient::IndexUser, CUser::IndexRealName }, rn);
        vm.addValue({ CClient::IndexVoiceCapabilities }, voiceCaps);
        this->updateOrAddClient(callsign, vm, false);
    }
 
    void CAirspaceMonitor::onCapabilitiesReplyReceived(const CCallsign &callsign, CClient::Capabilities clientCaps)
    {
        if (!this->isConnectedAndNotShuttingDown() || callsign.isEmpty()) { return; }
        const CVoiceCapabilities voiceCaps = sApp->getWebDataServices()->getVoiceCapabilityForCallsign(callsign);
        CPropertyIndexVariantMap vm(CClient::IndexCapabilities, CVariant::fromValue(clientCaps));
        vm.addValue({ CClient::IndexVoiceCapabilities }, voiceCaps);
        this->updateOrAddClient(callsign, vm, false);
 
        // for aircraft parts
        if (clientCaps.testFlag(CClient::FsdWithAircraftConfig))
        {
            m_fsdClient->sendClientQueryAircraftConfig(callsign);
        }
    }
 
    void CAirspaceMonitor::onServerReplyReceived(const CCallsign &callsign, const QString &server)
    {
        if (!this->isConnectedAndNotShuttingDown() || callsign.isEmpty() || server.isEmpty()) { return; }
        const CPropertyIndexVariantMap vm(CClient::IndexServer, server);
        this->updateOrAddClient(callsign, vm);
    }
 
    void CAirspaceMonitor::onFlightPlanReceived(const CCallsign &callsign, const CFlightPlan &flightPlan)
    {
        if (!this->isConnectedAndNotShuttingDown() || callsign.isEmpty()) { return; }
        CFlightPlan plan(flightPlan);
        plan.setWhenLastSentOrLoaded(QDateTime::currentDateTimeUtc());
        m_flightPlanCache.insert(callsign, plan);
    }
 
    void CAirspaceMonitor::removeAllOnlineAtcStations()
    {
        m_atcStationsOnline.clear();
        m_queryAtis.clear();
    }
 
    void CAirspaceMonitor::removeAllAircraft()
    {
        CRemoteAircraftProvider::removeAllAircraft();
 
        // non thread safe parts
        m_flightPlanCache.clear();
        m_readiness.clear();
        m_queryPilot.clear();
    }
 
    void CAirspaceMonitor::removeFromAircraftCachesAndLogs(const CCallsign &callsign)
    {
        if (callsign.isEmpty()) { return; }
        m_flightPlanCache.remove(callsign);
        m_readiness.remove(callsign);
        this->removeReverseLookupMessages(callsign);
    }
 
    void CAirspaceMonitor::onReceivedVatsimDataFile()
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
        if (!sApp || sApp->isShuttingDown() || !sApp->getWebDataServices()) { return; }
        CClientList clients(this->getClients()); // copy
        bool changed = false;
        for (auto &client : clients)
        {
            if (client.hasSpecifiedVoiceCapabilities()) { continue; } // we already have voice caps
            const CVoiceCapabilities vc =
                sApp->getWebDataServices()->getVoiceCapabilityForCallsign(client.getCallsign());
            if (vc.isUnknown()) { continue; }
            changed = true;
            client.setVoiceCapabilities(vc);
        }
        if (!changed) { return; }
        this->setClients(clients);
    }
 
    CAirspaceMonitor::Readiness &CAirspaceMonitor::addMatchingReadinessFlag(const CCallsign &callsign,
                                                                            CAirspaceMonitor::MatchingReadinessFlag mrf)
    {
        Readiness &readiness = m_readiness[callsign].addFlag(mrf);
        return readiness;
    }
 
    void CAirspaceMonitor::sendReadyForModelMatching(const CCallsign &callsign, MatchingReadinessFlag rf)
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        Q_ASSERT_X(!callsign.isEmpty(), Q_FUNC_INFO, "missing callsign");
 
        // set flag and init ts
        Readiness &readiness = this->addMatchingReadinessFlag(callsign, rf);
 
        // skip if already sent in the last x seconds
        const qint64 ageMs = readiness.getAgeMs();
        if (readiness.wasMatchingSent() && readiness.getAgeMs() < MMMaxAgeThresholdMs) { return; }
 
        // checking for min. situations ensures the aircraft is stable, can be interpolated ...
        const CSimulatedAircraft remoteAircraft = this->getAircraftInRangeForCallsign(callsign);
        const bool validRemoteCs = remoteAircraft.hasValidCallsign();
        const bool minSituations = this->remoteAircraftSituationsCount(callsign) > 1;
        const bool complete = validRemoteCs && minSituations &&
                              (readiness.receivedAll() ||
                               // disable, because it can be model string is unknown in FsInn data
                               // (remoteAircraft.getModel().getModelType() == CAircraftModel::TypeFSInnData) || // here
                               // we know we have all data
                               (remoteAircraft.hasModelString()) // we cannot expect more info
                              );
 
        const ReverseLookupLogging revLogEnabled = this->whatToReverseLog();
        if (rf != Verified && validRemoteCs && ageMs <= MMMaxAgeMs && !complete)
        {
            static const QString ws("Wait for further data, '%1' age: %2ms ts: %3");
            static const QString format("hh:mm:ss.zzz");
            if (!revLogEnabled.testFlag(RevLogSimplifiedInfo))
            {
                this->addReverseLookupMessage(
                    callsign,
                    ws.arg(readiness.toQString()).arg(ageMs).arg(QDateTime::currentDateTimeUtc().toString(format)));
            }
 
            const QPointer<CAirspaceMonitor> myself(this);
            QTimer::singleShot(MMCheckAgainMs, this, [=, this]() {
                if (!myself || !sApp || sApp->isShuttingDown()) { return; }
                if (!this->isAircraftInRange(callsign))
                {
                    const CStatusMessage m =
                        CCallsign::logMessage(callsign, "No longer in range", CAirspaceMonitor::getLogCategories());
                    this->addReverseLookupMessage(callsign, m);
                    return;
                }
                if (rf != ReceivedFsInnPacket)
                {
                    // here we call recursively like an FsInn packet was received
                    if (this->recallFsInnPacket(callsign)) { return; }
                }
 
                // check again
                this->sendReadyForModelMatching(callsign, RecursiveCall); // recursively
            });
 
            // end as we will call again in some time
            return;
 
        } // not yet complete
 
        // some checks for special conditions, e.g. logout -> empty list, but still signals pending
        if (validRemoteCs)
        {
            static const QString readyForMatching(
                "Ready (%1) for matching callsign '%2' with model type '%3', ICAO: '%4' '%5'");
 
            readiness.setFlag(ReadyForMatchingSent); // stored in readiness as reference
            const QString readyMsg = readyForMatching.arg(readiness.toQString(), callsign.toQString(),
                                                          remoteAircraft.getModel().getModelTypeAsString(),
                                                          remoteAircraft.getAircraftIcaoCode().getDesignatorDbKey(),
                                                          remoteAircraft.getAirlineIcaoCode().getDesignatorDbKey());
            const CStatusMessage m = CCallsign::logMessage(callsign, readyMsg, getLogCategories());
            this->addReverseLookupMessage(callsign, m);
 
            emit this->readyForModelMatching(remoteAircraft);
        }
        else
        {
            const CStatusMessage m = CCallsign::logMessage(
                callsign, "Ignoring this aircraft, not found in range list, disconnected, or no callsign",
                CAirspaceMonitor::getLogCategories(), CStatusMessage::SeverityWarning);
            this->addReverseLookupMessage(callsign, m);
            m_readiness.remove(callsign);
        }
    }
 
    void CAirspaceMonitor::verifyReceivedIcaoData(const CCallsign &callsign)
    {
        if (callsign.isEmpty() || !this->isAircraftInRange(callsign)) { return; }
 
        // set flag and init ts
        Readiness &readiness = m_readiness[callsign];
        if (readiness.wasMatchingSent()) { return; }
        if (readiness.wasVerified())
        {
            CLogMessage(this).warning(u"Verfied ICAO data of '%1' again, using it as it is! Most likely incomplete "
                                      u"data from the other client")
                << callsign;
            this->sendReadyForModelMatching(callsign, Verified);
            return;
        }
 
        // new trial
        readiness.addFlag(Verified);
 
        if (!readiness.receivedIcaoCodes())
        {
            CLogMessage(this).info(u"Query ICAO codes for '%1' again") << callsign;
            this->sendInitialPilotQueries(callsign, true, true);
 
            // if the queries now yield a result all will be fine
            // otherwise we need to check again
            const QPointer<CAirspaceMonitor> myself(this);
            QTimer::singleShot(MMVerifyMs, this, [=, this]() {
                // makes sure we have ICAO data
                if (!myself || !sApp || sApp->isShuttingDown()) { return; }
                this->verifyReceivedIcaoData(callsign);
            });
            return;
        }
 
        // normally we should never get here
        CLogMessage(this).info(u"Verified '%1' again, has ICAO codes, ready for matching!") << callsign;
        this->sendReadyForModelMatching(callsign, Verified);
    }
 
    void CAirspaceMonitor::onAtcPositionUpdate(const CCallsign &callsign, const CFrequency &frequency,
                                               const CCoordinateGeodetic &position,
                                               const swift::misc::physical_quantities::CLength &range)
    {
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "wrong thread");
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        const CAtcStationList stationsWithCallsign = m_atcStationsOnline.findByCallsign(callsign);
        if (stationsWithCallsign.isEmpty())
        {
            CAtcStation station;
 
            // if connected to VATSIM, init with data from data file
            if (this->getConnectedServer().getEcosystem() == CEcosystem::vatsim())
            {
                station = sApp->getWebDataServices()->getAtcStationsForCallsign(callsign).frontOrDefault();
            }
 
            station.setCallsign(callsign);
            station.setRange(range);
            station.setFrequency(frequency);
            station.setPosition(position);
            station.setOnline(true);
            station.calculcateAndUpdateRelativeDistanceAndBearing(this->getOwnAircraftPosition());
 
            m_atcStationsOnline.push_back(station);
 
            // subsequent queries
            this->sendInitialAtcQueries(callsign);
 
            // update distances
            m_atcStationsOnline.calculcateAndUpdateRelativeDistanceAndBearing(this->getOwnAircraftSituation());
 
            emit this->changedAtcStationsOnline();
        }
        else
        {
            // update
            CPropertyIndexVariantMap vm;
            vm.addValue(CAtcStation::IndexFrequency, frequency);
            vm.addValue(CAtcStation::IndexPosition, position);
            vm.addValue(CAtcStation::IndexRange, range);
            const int changed = m_atcStationsOnline.applyIfCallsign(callsign, vm, true);
            if (changed > 0) { emit this->changedAtcStationsOnline(); }
        }
    }
 
    void CAirspaceMonitor::onAtcControllerDisconnected(const CCallsign &callsign)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        this->removeClient(callsign);
        if (m_atcStationsOnline.containsCallsign(callsign))
        {
            const CAtcStation removedStation = m_atcStationsOnline.findFirstByCallsign(callsign);
            m_atcStationsOnline.removeByCallsign(callsign);
            emit this->changedAtcStationsOnline();
            emit this->atcStationDisconnected(removedStation);
        }
    }
 
    void CAirspaceMonitor::onAtisReceived(const CCallsign &callsign, const CInformationMessage &atisMessage)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
        if (!this->isConnectedAndNotShuttingDown() || callsign.isEmpty()) return;
        const bool changedAtis = m_atcStationsOnline.updateIfMessageChanged(atisMessage, callsign, true);
 
        // signal
        if (changedAtis) { emit this->changedAtisReceived(callsign); }
    }
 
    void CAirspaceMonitor::onAtisLogoffTimeReceived(const CCallsign &callsign, const QString &zuluTime)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        if (zuluTime.length() == 5) // for example 2000z
        {
            // Logic to set logoff time
 
            QStringView zuluTimeView(zuluTime);
            // TODO Replace with Qt 6.0 QStringView::slice()
            zuluTimeView.chop(1); // Remove z
 
            bool ok {};
            const int h = zuluTimeView.left(2).toInt(&ok);
            if (!ok) { return; }
            const int m = zuluTimeView.right(2).toInt(&ok);
            if (!ok) { return; }
            QDateTime logoffDateTime = QDateTime::currentDateTimeUtc();
            logoffDateTime.setTime(QTime(h, m));
 
            const CPropertyIndexVariantMap vm(CAtcStation::IndexLogoffTime, CVariant(logoffDateTime));
            this->updateOnlineStation(callsign, vm);
        }
    }
 
    void CAirspaceMonitor::onCustomFSInnPacketReceived(const CCallsign &callsign, const QString &airlineIcaoDesignator,
                                                       const QString &aircraftIcaoDesignator,
                                                       const QString &combinedAircraftType, const QString &modelString)
    {
        // it can happen this is called before any queries
        // ES sends FsInn packets for callsigns such as ACCGER1, which are hard to distinguish
        // 1) checking if they are already in the list checks again ATC position which is safe
        // 2) the ATC alike callsign check is guessing
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "not in main thread");
        if (!callsign.isValid()) { return; } // aircraft OBS, other invalid callsigns
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        const bool isAircraft = this->isAircraftInRange(callsign);
        const bool isAtc = m_atcStationsOnline.containsCallsign(callsign);
        if (!isAircraft && !isAtc)
        {
            // we have no idea what we are dealing with, so we store it
            const FsInnPacket fsInn(aircraftIcaoDesignator, airlineIcaoDesignator, combinedAircraftType, modelString);
            m_tempFsInnPackets[callsign] = fsInn;
            return;
        }
 
        // Request of other client, I can get the other's model from that
        // we do not ignore model string here
        const CPropertyIndexVariantMap vm(CClient::IndexModelString, modelString);
        this->updateOrAddClient(callsign, vm);
 
        if (isAircraft)
        {
            this->addMatchingReadinessFlag(callsign, ReceivedFsInnPacket); // in any case we did receive it
 
            const ReverseLookupLogging reverseLookupEnabled = this->isReverseLookupMessagesEnabled();
            CStatusMessageList reverseLookupMessages;
            CStatusMessageList *pReverseLookupMessages =
                reverseLookupEnabled.testFlag(RevLogEnabled) ? &reverseLookupMessages : nullptr;
 
            CCallsign::addLogDetailsToList(
                pReverseLookupMessages, callsign,
                QStringLiteral("FsInn data from network: aircraft '%1', airline '%2', model '%3', combined '%4'")
                    .arg(aircraftIcaoDesignator, airlineIcaoDesignator, modelString, combinedAircraftType));
 
            QString usedModelString = modelString;
 
            const CAircraftMatcherSetup setup = m_matchingSettings.get();
            if (!modelString.isEmpty() && !setup.isReverseLookupModelString())
            {
                usedModelString.clear();
                CCallsign::addLogDetailsToList(
                    pReverseLookupMessages, callsign,
                    QStringLiteral("FsInn modelstring '%1' ignored because of setup").arg(modelString));
            }
            else if (!CAircraftMatcher::isKnownModelString(modelString, callsign, pReverseLookupMessages))
            {
                // from the T701 test, do NOT use if model string is unknown
                // this can overrride "swift livery strings", FsInn here only is useful with a known model string
                usedModelString.clear();
                CCallsign::addLogDetailsToList(
                    pReverseLookupMessages, callsign,
                    QStringLiteral("FsInn modelstring ignored, as modelstring '%1' is not known").arg(modelString));
            }
 
            // if model string is empty, FsInn data are pointless
            // in order not to override swift livery string data, we ignore those
            if (!usedModelString.isEmpty())
            {
                this->addOrUpdateAircraftInRange(callsign, aircraftIcaoDesignator, airlineIcaoDesignator, QString(),
                                                 usedModelString, CAircraftModel::TypeFSInnData,
                                                 pReverseLookupMessages);
                this->addReverseLookupMessages(callsign, reverseLookupMessages);
            }
            this->sendReadyForModelMatching(callsign, ReceivedFsInnPacket); // from FSInn
        }
    }
 
    void CAirspaceMonitor::onIcaoCodesReceived(const CCallsign &callsign, const QString &aircraftIcaoDesignator,
                                               const QString &airlineIcaoDesignator, const QString &livery)
    {
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "not in main thread");
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        if (CBuildConfig::isLocalDeveloperDebugBuild())
        {
            SWIFT_VERIFY_X(callsign.isValid(), Q_FUNC_INFO, "invalid callsign");
        }
        if (!callsign.isValid()) { return; }
        if (!this->isAircraftInRange(callsign)) { return; } // FSD overload issue, do not do anything if unknown
 
        const ReverseLookupLogging reverseLookupEnabled = this->isReverseLookupMessagesEnabled();
        CStatusMessageList reverseLookupMessages;
        CStatusMessageList *pReverseLookupMessages =
            reverseLookupEnabled.testFlag(RevLogEnabled) ? &reverseLookupMessages : nullptr;
        CCallsign::addLogDetailsToList(pReverseLookupMessages, callsign,
                                       QStringLiteral("Data from network: aircraft '%1', airline '%2', livery '%3'")
                                           .arg(aircraftIcaoDesignator, airlineIcaoDesignator, livery),
                                       CAirspaceMonitor::getLogCategories());
 
        const CClient client = this->getClientOrDefaultForCallsign(callsign);
        this->addOrUpdateAircraftInRange(callsign, aircraftIcaoDesignator, airlineIcaoDesignator, livery,
                                         client.getQueriedModelString(), CAircraftModel::TypeQueriedFromNetwork,
                                         pReverseLookupMessages);
        this->addReverseLookupMessages(callsign, reverseLookupMessages);
        this->sendReadyForModelMatching(callsign, ReceivedIcaoCodes); // ICAO codes received
 
        emit this->requestedNewAircraft(callsign, aircraftIcaoDesignator, airlineIcaoDesignator, livery);
    }
 
    CAircraftModel CAirspaceMonitor::reverseLookupModelWithFlightplanData(
        const CCallsign &callsign, const QString &aircraftIcaoString, const QString &airlineIcaoString,
        const QString &liveryString, const QString &modelString, CAircraftModel::ModelType type,
        CStatusMessageList *log, bool runMatchinScript)
    {
        const int modelSetCount = m_modelSetProvider->getModelSetCount();
        CCallsign::addLogDetailsToList(
            log, callsign, QStringLiteral("Reverse lookup (with FP data), model set count: %1").arg(modelSetCount),
            CAirspaceMonitor::getLogCategories());
 
        const DBTripleIds ids = CAircraftModel::parseNetworkLiveryString(liveryString);
        const bool hasAnyId = ids.hasAnyId();
        if (hasAnyId) { this->markAsSwiftClient(callsign); }
 
        CAircraftModel lookupModel; // result
        const CAircraftModelList modelSet = m_modelSetProvider->getModelSet();
        const CAircraftMatcherSetup setup = m_matchingSettings.get();
        do {
            // directly check model string
            if (!modelString.isEmpty())
            {
                lookupModel = CAircraftMatcher::reverseLookupModelStringInDB(modelString, callsign,
                                                                             setup.isReverseLookupModelString(), log);
                if (lookupModel.hasValidDbKey()) { break; } // found by model string
            }
 
            CLivery livery;
            CAirlineIcaoCode airlineIcao;
            CAircraftIcaoCode aircraftIcao;
 
            if (!setup.isReverseLookupSwiftLiveryIds())
            {
                CCallsign::addLogDetailsToList(
                    log, callsign, QStringLiteral("Reverse lookup of livery string '%1' disabled").arg(liveryString));
            }
            else if (hasAnyId)
            {
                if (ids.model >= 0)
                {
                    lookupModel = CAircraftMatcher::reverseLookupModelId(ids.model, callsign, log);
                    if (lookupModel.hasValidDbKey()) { break; } // found by model id from livery string
                }
 
                CAircraftMatcher::reverseLookupByIds(ids, aircraftIcao, livery, callsign, log);
                if (livery.hasValidDbKey()) { airlineIcao = livery.getAirlineIcaoCode(); }
 
                if (aircraftIcao.hasValidDbKey() && livery.hasValidDbKey())
                {
                    CCallsign::addLogDetailsToList(
                        log, callsign,
                        QStringLiteral("Using DB livery %1 and aircraft ICAO %2 to create model")
                            .arg(livery.getDbKeyAsString(), aircraftIcao.getDbKeyAsString()),
                        CAirspaceMonitor::getLogCategories());
 
                    // we have a valid livery from DB + valid aircraft ICAO from DB
                    lookupModel =
                        CAircraftModel(modelString, type, "By DB livery and aircraft ICAO", aircraftIcao, livery);
                    break;
                }
            }
 
            // now fuzzy search on aircraft
            if (!aircraftIcao.hasValidDbKey())
            {
                aircraftIcao = CAircraftIcaoCode(aircraftIcaoString);
                const bool knownAircraftIcao =
                    CAircraftMatcher::isKnownAircraftDesignator(aircraftIcaoString, callsign, log);
                if (airlineIcao.isLoadedFromDb() && !knownAircraftIcao)
                {
                    // we have no valid aircraft ICAO, so we do a fuzzy search among those
                    CCallsign::addLogDetailsToList(
                        log, callsign,
                        QStringLiteral("Fuzzy search among airline aircraft because '%1' is not known ICAO designator")
                            .arg(aircraftIcaoString));
                    const CAircraftIcaoCode foundIcao =
                        CAircraftMatcher::searchAmongAirlineAircraft(aircraftIcaoString, airlineIcao, callsign, log);
                    if (foundIcao.isLoadedFromDb()) { aircraftIcao = foundIcao; }
                }
            }
 
            // if we have a livery, we already know the airline, or the livery is a color livery
            if (!airlineIcao.hasValidDbKey() && !livery.hasValidDbKey())
            {
                const CFlightPlanRemarks fpRemarks = this->tryToGetFlightPlanRemarks(callsign);
                // const bool hasParsedAirlineRemarks = fpRemarks.hasParsedAirlineRemarks();
 
                QString airlineNameLookup;
                QString telephonyLookup;
                QString telephonyFromFp;
                QString airlineNameFromFp;
                QString airlineIcaoFromFp;
 
                if (fpRemarks.isEmpty())
                {
                    CCallsign::addLogDetailsToList(log, callsign,
                                                   QStringLiteral("No flight plan remarks, skipping FP resolution"));
                }
                else
                {
                    CCallsign::addLogDetailsToList(log, callsign,
                                                   QStringLiteral("FP remarks: '%1'").arg(fpRemarks.getRemarks()));
                    CCallsign::addLogDetailsToList(
                        log, callsign, QStringLiteral("FP rem.parsed: '%1'").arg(fpRemarks.toQString(true)));
 
                    // FP data if any
                    telephonyFromFp = CAircraftMatcher::reverseLookupTelephonyDesignator(fpRemarks.getRadioTelephony(),
                                                                                         callsign, log);
                    airlineNameFromFp =
                        CAircraftMatcher::reverseLookupAirlineName(fpRemarks.getFlightOperator(), callsign, log);
                    airlineIcaoFromFp = fpRemarks.getAirlineIcao().getDesignator();
 
                    // turn into names as in DB
                    airlineNameLookup = CAircraftMatcher::reverseLookupAirlineName(airlineNameFromFp);
                    telephonyLookup = CAircraftMatcher::reverseLookupTelephonyDesignator(telephonyFromFp);
                    if (!airlineNameLookup.isEmpty())
                    {
                        CCallsign::addLogDetailsToList(
                            log, callsign,
                            QStringLiteral("Using resolved airline name '%1' found by FP name '%2'")
                                .arg(airlineNameLookup, airlineNameFromFp),
                            CAirspaceMonitor::getLogCategories());
                    }
                    if (!telephonyLookup.isEmpty())
                    {
                        CCallsign::addLogDetailsToList(
                            log, callsign,
                            QStringLiteral("Using resolved telephony designator '%1' found by FP telephoy '%2'")
                                .arg(telephonyLookup, telephonyFromFp),
                            CAirspaceMonitor::getLogCategories());
                    }
                }
 
                // This code is needed WITH and WITHOUT FP data
 
                // INFO: CModelMatcherComponent::reverseLookup() contains the simulated lookup
                // changed with T701: resolve first against model set, then all DB data
                // if an airline is ambiguous most likely the one in the set is the best choice
                airlineIcao = CAircraftMatcher::failoverValidAirlineIcaoDesignatorModelsFirst(
                    callsign, airlineIcaoString, airlineIcaoFromFp, true, airlineNameFromFp, telephonyFromFp, modelSet,
                    log);
 
                // not found, create a search patterm
                if (!airlineIcao.isLoadedFromDb())
                {
                    if (!airlineIcao.hasValidDesignator())
                    {
                        airlineIcao.setDesignator(airlineIcaoString.isEmpty() ? callsign.getAirlinePrefix() :
                                                                                airlineIcaoString);
                    }
                    if (!airlineNameLookup.isEmpty()) { airlineIcao.setName(airlineNameLookup); }
                    if (!telephonyLookup.isEmpty()) { airlineIcao.setTelephonyDesignator(telephonyLookup); }
 
                    // already try to resolve at this stage by a smart lookup with all the filled data from above
                    airlineIcao = CAircraftMatcher::reverseLookupAirlineIcao(airlineIcao, callsign, log);
                }
            }
 
            CCallsign::addLogDetailsToList(log, callsign,
                                           QStringLiteral("Used aircraft ICAO: '%1'").arg(aircraftIcao.toQString(true)),
                                           CAirspaceMonitor::getLogCategories());
            CCallsign::addLogDetailsToList(log, callsign,
                                           QStringLiteral("Used airline ICAO: '%1'").arg(airlineIcao.toQString(true)),
                                           CAirspaceMonitor::getLogCategories());
 
            // matching script is used below
            lookupModel = CAircraftMatcher::reverseLookupModel(callsign, aircraftIcao, airlineIcao, liveryString,
                                                               modelString, setup, modelSet, type, log);
        }
        while (false);
 
        // model found
        lookupModel.setCallsign(callsign);
 
        // script
        if (runMatchinScript && setup.doRunMsReverseLookupScript())
        {
            const MatchingScriptReturnValues rv =
                CAircraftMatcher::reverseLookupScript(lookupModel, setup, modelSet, log);
            if (rv.runScriptAndModified())
            {
                if (rv.runScriptAndRerun())
                {
                    CCallsign::addLogDetailsToList(
                        log, callsign, QStringLiteral("Matching script: Re-run reverseLookupModelWithFlightplanData"),
                        CAirspaceMonitor::getLogCategories());
                    return CAirspaceMonitor::reverseLookupModelWithFlightplanData(
                        callsign, rv.model.getAircraftIcaoCodeDesignator(), rv.model.getAirlineIcaoCodeVDesignator(),
                        rv.model.getLivery().getCombinedCode(), modelString, type, log, false);
                }
                lookupModel = rv.model;
                CCallsign::addLogDetailsToList(log, callsign,
                                               QStringLiteral("Matching script: Using model from matching script"),
                                               CAirspaceMonitor::getLogCategories());
            }
        }
        else { CCallsign::addLogDetailsToList(log, callsign, QStringLiteral("No reverse lookup script used")); }
 
        // done
        lookupModel.setCallsign(callsign); // set again just in case modified by script
        return lookupModel;
    }
 
    bool CAirspaceMonitor::addNewAircraftInRange(const CSimulatedAircraft &aircraft)
    {
        const CCallsign callsign = aircraft.getCallsign();
        Q_ASSERT_X(!callsign.isEmpty(), Q_FUNC_INFO, "Missing callsign");
 
        if (!sApp || sApp->isShuttingDown() || !sApp->getWebDataServices()) { return false; }
 
        CSimulatedAircraft newAircraft(aircraft);
        newAircraft.setRendered(false); // reset rendering
        newAircraft.calculcateAndUpdateRelativeDistanceAndBearing(
            this->getOwnAircraftPosition()); // distance from myself
 
        if (this->getConnectedServer().getEcosystem() == CEcosystem::vatsim())
        {
            sApp->getWebDataServices()->updateWithVatsimDataFileData(newAircraft);
        }
        const bool added = CRemoteAircraftProvider::addNewAircraftInRange(newAircraft);
        if (added)
        {
            const QPointer<CAirspaceMonitor> myself(this);
            QTimer::singleShot(MMVerifyMs, this, [=, this]() {
                // makes sure we have ICAO data
                if (!myself || !sApp || sApp->isShuttingDown()) { return; }
                this->verifyReceivedIcaoData(callsign);
            });
 
            if (aircraft.hasModelString())
            {
                // most likely I could take the CG at this time from aircraft
                // to make sure it is really the DB value I query again
                const CAircraftModel model =
                    sApp->getWebDataServices()->getModelForModelString(aircraft.getModelString());
                const CLength cg = model.hasValidDbKey() ? model.getCG() : CLength::null();
                this->rememberCGFromDB(cg, aircraft.getModelString());
                this->rememberCGFromDB(cg, aircraft.getCallsign());
            }
        }
        return added;
    }
 
    void CAirspaceMonitor::asyncReInitializeAllAircraft(const CSimulatedAircraftList &aircraft,
                                                        bool readyForModelMatching)
    {
        if (aircraft.isEmpty()) { return; }
        if (!sApp || sApp->isShuttingDown()) { return; }
 
        int c = 1;
        QPointer<CAirspaceMonitor> myself(this);
        for (const CSimulatedAircraft &ac : aircraft)
        {
            QTimer::singleShot(c++ * 25, this, [=, this] {
                if (!myself) { return; }
                myself->addNewAircraftInRange(ac);
                if (!readyForModelMatching) { return; }
                const CCallsign cs = ac.getCallsign();
 
                m_readiness.remove(cs); // cleanup
                const MatchingReadinessFlag ready = ReceivedAll;
                myself->sendReadyForModelMatching(cs, ready); // airspace monitor adding all aicraft
            });
        }
    }
 
    int CAirspaceMonitor::updateOnlineStation(const CCallsign &callsign, const CPropertyIndexVariantMap &vm,
                                              bool skipEqualValues, bool sendSignal)
    {
        const int c = m_atcStationsOnline.applyIfCallsign(callsign, vm, skipEqualValues);
        if (c > 0 && sendSignal) { emit this->changedAtcStationsOnline(); }
        return c;
    }
 
    bool CAirspaceMonitor::handleMaxRange(const CAircraftSituation &situation)
    {
        if (situation.isNull()) { return false; }
        if (m_maxDistanceNM < 0) { return true; }
        const int distanceNM =
            this->getOwnAircraft().calculateGreatCircleDistance(situation).valueInteger(CLengthUnit::NM());
        if (distanceNM > m_maxDistanceNMHysteresis)
        {
            this->removeAircraft(situation.getCallsign());
            return false;
        }
        return distanceNM <= m_maxDistanceNM;
    }
 
    bool CAirspaceMonitor::recallFsInnPacket(const CCallsign &callsign)
    {
        if (!m_tempFsInnPackets.contains(callsign)) { return false; }
        const FsInnPacket packet = m_tempFsInnPackets[callsign];
        m_tempFsInnPackets.remove(callsign);
        this->onCustomFSInnPacketReceived(callsign, packet.airlineIcaoDesignator, packet.aircraftIcaoDesignator,
                                          packet.combinedCode, packet.modelString);
        return true;
    }
 
    CSimulatedAircraft CAirspaceMonitor::addOrUpdateAircraftInRange(
        const CCallsign &callsign, const QString &aircraftIcao, const QString &airlineIcao, const QString &livery,
        const QString &modelString, CAircraftModel::ModelType modelType, CStatusMessageList *log)
    {
        const CSimulatedAircraft aircraft = this->getAircraftInRangeForCallsign(callsign);
        if (aircraft.hasValidCallsign())
        {
            // only if we do not have a DB model yet
            if (!aircraft.getModel().hasValidDbKey())
            {
                CAircraftModel model = this->reverseLookupModelWithFlightplanData(callsign, aircraftIcao, airlineIcao,
                                                                                  livery, modelString, modelType, log);
                model.updateMissingParts(aircraft.getModel());
                // Use anonymous as originator here, since the remote aircraft provider is ourselves and the call to
                // updateAircraftModel() would return without doing anything.
                this->updateAircraftModel(callsign, model, CIdentifier::null());
                this->updateAircraftNetworkModel(callsign, model, CIdentifier::null());
            }
        }
        else
        {
            /* FSD overload issue, do NOT to add new aircraft other than from positions
            const CAircraftModel model = this->reverseLookupModelWithFlightplanData(callsign, aircraftIcao, airlineIcao,
            livery, modelString, modelType, log); const CSimulatedAircraft initAircraft(model);
            this->addNewAircraftInRange(initAircraft);
            */
        }
        return aircraft;
    }
 
    bool CAirspaceMonitor::extrapolateElevation(CAircraftSituationList &situations,
                                                const CAircraftSituationChange &change)
    {
        if (situations.size() < 3) { return false; }
        // Q_ASSERT_X(situations.m_tsAdjustedSortHint == CAircraftSituationList::AdjustedTimestampLatestFirst,
        // Q_FUNC_INFO, "Need latest first");
        const CAircraftSituation old = situations[1];
        const CAircraftSituation older = situations[2];
        return extrapolateElevation(situations.front(), old, older, change);
    }
 
    bool CAirspaceMonitor::extrapolateElevation(CAircraftSituation &situationToBeUpdated,
                                                const CAircraftSituation &oldSituation,
                                                const CAircraftSituation &olderSituation,
                                                const CAircraftSituationChange &oldChange)
    {
        if (situationToBeUpdated.hasGroundElevation()) { return false; }
 
        // if acceptable transfer
        if (oldSituation.transferGroundElevationFromMe(situationToBeUpdated))
        {
            // change or keep type is the question
            // situationToBeUpdated.setGroundElevationInfo(Extrapolated);
            return true;
        }
        if (oldSituation.isNull() || olderSituation.isNull()) { return false; }
 
        if (oldChange.isNull()) { return false; }
        if (oldChange.isConstOnGround() && oldChange.hasAltitudeDevWithinAllowedRange() &&
            oldChange.hasElevationDevWithinAllowedRange())
        {
            // we have almost const altitudes and elevations
            const double deltaAltFt = qAbs(situationToBeUpdated.getAltitude().value(CLengthUnit::ft()) -
                                           olderSituation.getAltitude().value(CLengthUnit::ft()));
            if (deltaAltFt <= CAircraftSituation::allowedAltitudeDeviation().value(CLengthUnit::ft()))
            {
                // the current alt is also not much different
                situationToBeUpdated.setGroundElevation(oldSituation.getGroundElevation(),
                                                        CAircraftSituation::Extrapolated);
                return true;
            }
        }
 
        return false;
    }
 
    void CAirspaceMonitor::onAircraftUpdateReceived(const CAircraftSituation &situation,
                                                    const CTransponder &transponder)
    {
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "Called in different thread");
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        const CCallsign callsign(situation.getCallsign());
        Q_ASSERT_X(!callsign.isEmpty(), Q_FUNC_INFO, "Empty callsign");
 
        if (this->isCopilotAircraft(callsign)) { return; }
 
        // range (FSD overload issue)
        const bool validMaxRange = this->handleMaxRange(situation);
        const bool existsInRange = this->isAircraftInRange(callsign); // AFTER valid max.range check!
        if (!validMaxRange && !existsInRange) { return; } // not valid at all
 
        // update client info
        this->autoAdjustCientGndCapability(situation);
 
        // store situation history
        this->storeAircraftSituation(situation); // updates situation
 
        // in case we only have
        if (!existsInRange && validMaxRange)
        {
            // NEW aircraft
            const bool hasFsInnPacket = m_tempFsInnPackets.contains(callsign);
 
            CSimulatedAircraft aircraft;
            aircraft.setCallsign(callsign);
            aircraft.setSituation(situation);
            aircraft.setTransponder(transponder);
            this->addNewAircraftInRange(aircraft);
            this->sendInitialPilotQueries(callsign, true, !hasFsInnPacket);
 
            // new client, there is a chance it has been already created by custom packet
            const CClient client(callsign);
            this->addNewClient(client);
        }
        else if (existsInRange)
        {
            // update, aircraft already exists
            CPropertyIndexVariantMap vm;
            vm.addValue(CSimulatedAircraft::IndexTransponder, transponder);
            vm.addValue(CSimulatedAircraft::IndexSituation, situation);
            vm.addValue(CSimulatedAircraft::IndexRelativeDistance, this->calculateDistanceToOwnAircraft(situation));
            vm.addValue(CSimulatedAircraft::IndexRelativeBearing, this->calculateBearingToOwnAircraft(situation));
            this->updateAircraftInRange(callsign, vm);
        }
    }
 
    void CAirspaceMonitor::onAircraftInterimUpdateReceived(const CAircraftSituation &situation)
    {
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "Called in different thread");
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        const CCallsign callsign(situation.getCallsign());
 
        // checks
        Q_ASSERT_X(!callsign.isEmpty(), Q_FUNC_INFO, "Empty callsign");
 
        if (isCopilotAircraft(callsign)) { return; }
        if (!this->isAircraftInRange(callsign)) { return; }
 
        if (CBuildConfig::isLocalDeveloperDebugBuild())
        {
            Q_ASSERT_X(!situation.isNaNVectorDouble(), Q_FUNC_INFO, "Detected NaN");
            Q_ASSERT_X(!situation.isInfVectorDouble(), Q_FUNC_INFO, "Detected inf");
            Q_ASSERT_X(situation.isValidVectorRange(), Q_FUNC_INFO, "out of range [-1,1]");
        }
 
        // Interim packets do not have groundspeed, hence set the last known value.
        // If there is no full position available yet, throw this interim position away.
        CAircraftSituation interimSituation(situation);
        CAircraftSituationList history = this->remoteAircraftSituations(callsign);
        if (history.isEmpty()) { return; } // we need one full situation at least
        const CAircraftSituation lastSituation = history.latestObject();
 
        // changed position, continue and copy values
        interimSituation.setCurrentUtcTime();
        interimSituation.setGroundSpeed(lastSituation.getGroundSpeed());
 
        // store situation history
        this->storeAircraftSituation(interimSituation);
 
        const bool samePosition = lastSituation.equalNormalVectorDouble(interimSituation);
        if (samePosition) { return; } // nothing to update
 
        // update aircraft
        this->updateAircraftInRangeDistanceBearing(callsign, interimSituation,
                                                   this->calculateDistanceToOwnAircraft(interimSituation),
                                                   this->calculateBearingToOwnAircraft(interimSituation));
    }
 
    void CAirspaceMonitor::onAircraftVisualUpdateReceived(const swift::misc::aviation::CAircraftSituation &situation)
    {
        Q_ASSERT_X(CThreadUtils::isInThisThread(this), Q_FUNC_INFO, "Called in different thread");
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        const CCallsign callsign(situation.getCallsign());
 
        // checks
        Q_ASSERT_X(!callsign.isEmpty(), Q_FUNC_INFO, "Empty callsign");
 
        if (isCopilotAircraft(callsign)) { return; }
        if (!this->isAircraftInRange(callsign)) { return; }
 
        if (CBuildConfig::isLocalDeveloperDebugBuild())
        {
            Q_ASSERT_X(!situation.isNaNVectorDouble(), Q_FUNC_INFO, "Detected NaN");
            Q_ASSERT_X(!situation.isInfVectorDouble(), Q_FUNC_INFO, "Detected inf");
            Q_ASSERT_X(situation.isValidVectorRange(), Q_FUNC_INFO, "out of range [-1,1]");
        }
 
        // Visual packets do not have groundspeed, hence set the last known value.
        // If there is no full position available yet, throw this interim position away.
        CAircraftSituation visualSituation(situation);
        CAircraftSituationList history = this->remoteAircraftSituations(callsign);
        if (history.empty()) { return; } // we need one full situation at least
        const CAircraftSituation lastSituation = history.latestObject();
 
        // changed position, continue and copy values
        visualSituation.setCurrentUtcTime();
        visualSituation.setGroundSpeed(lastSituation.getGroundSpeed());
 
        // store situation history
        this->storeAircraftSituation(visualSituation);
 
        const bool samePosition = lastSituation.equalNormalVectorDouble(visualSituation);
        if (samePosition) { return; } // nothing to update
 
        // update aircraft
        this->updateAircraftInRangeDistanceBearing(callsign, visualSituation,
                                                   this->calculateDistanceToOwnAircraft(visualSituation),
                                                   this->calculateBearingToOwnAircraft(visualSituation));
    }
 
    void CAirspaceMonitor::onAircraftSimDataUpdateReceived(const CAircraftSituation &situation,
                                                           const CAircraftParts &parts, qint64 currentOffsetMs,
                                                           const QString &aircraftIcao, const QString &airlineIcao)
    {
        onAircraftUpdateReceived(situation, CTransponder(2000, CTransponder::ModeC));
 
        const CSimulatedAircraft aircraft = getAircraftInRangeForCallsign(situation.getCallsign());
        const CAircraftModel &model = aircraft.getNetworkModel();
        if (model.getAircraftIcaoCodeDesignator() != aircraftIcao)
        {
            onIcaoCodesReceived(situation.getCallsign(), aircraftIcao, airlineIcao, airlineIcao);
        }
 
        onAircraftConfigReceived(situation.getCallsign(), parts.toFullJson(), currentOffsetMs);
    }
 
    void CAirspaceMonitor::onConnectionStatusChanged(CConnectionStatus oldStatus, CConnectionStatus newStatus)
    {
        Q_UNUSED(oldStatus)
        if (newStatus == CConnectionStatus::Connecting && m_fsdClient)
        {
            const CServer server = m_fsdClient->getServer();
            const bool isVatsim = server.getEcosystem().isSystem(CEcosystem::VATSIM);
            const CLength maxRange(isVatsim ? 125 : -1, CLengthUnit::NM());
            this->setMaxRange(maxRange);
        }
 
        if (newStatus.isDisconnected()) { this->clear(); }
    }
 
    void CAirspaceMonitor::onPilotDisconnected(const CCallsign &callsign)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
 
        // in case of inconsistencies I always remove here
        this->removeFromAircraftCachesAndLogs(callsign);
        const bool removed = CRemoteAircraftProvider::removeAircraft(callsign);
        this->removeClient(callsign);
        if (removed) { emit this->removedAircraft(callsign); }
    }
 
    void CAirspaceMonitor::onFrequencyReceived(const CCallsign &callsign, const CFrequency &frequency)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
 
        // update
        const CPropertyIndexVariantMap vm({ CSimulatedAircraft::IndexCom1System, CComSystem::IndexActiveFrequency },
                                          CVariant::fromValue(frequency));
        this->updateAircraftInRange(callsign, vm);
    }
 
    void CAirspaceMonitor::onAircraftConfigReceived(const CCallsign &callsign, const QJsonObject &jsonObject,
                                                    qint64 currentOffsetMs)
    {
        Q_ASSERT(CThreadUtils::isInThisThread(this));
        SWIFT_AUDIT_X(!callsign.isEmpty(), Q_FUNC_INFO, "Need callsign");
        if (callsign.isEmpty()) { return; }
 
        // store parts
        this->storeAircraftParts(callsign, jsonObject, currentOffsetMs);
 
        // update client capability
        CClient client = this->getClientOrDefaultForCallsign(callsign);
        client.setUserCallsign(callsign); // make valid by setting a callsign
        if (client.hasCapability(CClient::FsdWithAircraftConfig)) { return; }
        client.addCapability(CClient::FsdWithAircraftConfig);
        this->setOtherClient(client);
    }
 
    CAircraftSituation CAirspaceMonitor::storeAircraftSituation(const CAircraftSituation &situation,
                                                                bool allowTestOffset)
    {
        const CCallsign callsign(situation.getCallsign());
        SWIFT_VERIFY_X(!callsign.isEmpty(), Q_FUNC_INFO, "empty callsign");
        if (callsign.isEmpty()) { return situation; }
 
        CAircraftSituation correctedSituation(allowTestOffset ? this->addTestAltitudeOffsetToSituation(situation) :
                                                                situation);
        bool needToRequestElevation = false;
        bool canLikelySkipNearGround = correctedSituation.canLikelySkipNearGroundInterpolation();
        do {
            // Check if we can bail out and ignore all elevation handling
            //
            // rational:
            // a) elevation handling is expensive, and might even requests elevation from sim.
            // b) elevations not needed pollute the cache with "useless" values
            //
            if (canLikelySkipNearGround || correctedSituation.hasGroundElevation()) { break; }
 
            // set a defined state
            correctedSituation.resetGroundElevation();
 
            // Guessing gives better values, also for smaller planes
            // and avoids unnecessary elevation fetching for low flying smaller GA aircraft
            const CAircraftIcaoCode icao = this->getAircraftInRangeModelForCallsign(callsign).getAircraftIcaoCode();
            if (!icao.hasDesignator()) { break; } // what is that?
            if (icao.isVtol())
            {
                // VTOLs over 60kts likely not on ground
                // it could be that a low flying helicopter near ground
                if (situation.getGroundSpeed().value(CSpeedUnit::kts()) > 60) { break; }
            }
            else
            {
                // NO VTOL
                CLength cg(nullptr);
                CSpeed rotateSpeed(nullptr);
                icao.guessModelParameters(cg, rotateSpeed);
                if (!rotateSpeed.isNull())
                {
                    rotateSpeed *= 1.25; // some margin
                    if (situation.getGroundSpeed() > rotateSpeed) { break; }
                }
            }
 
            // fetch from cache or request
            const CAircraftSituationChange changesBeforeStoring =
                this->remoteAircraftSituationChanges(callsign).frontOrDefault();
 
            if (!changesBeforeStoring.isNull())
            {
                canLikelySkipNearGround = changesBeforeStoring.isConstAscending();
                if (canLikelySkipNearGround) { break; }
            }
 
            // we NEED elevation
            // actually distance of 200k/h 100ms is just 6.1 meters
            using namespace std::chrono_literals;
            const CLength dpt = correctedSituation.getDistancePerTime(100ms, CElevationPlane::singlePointRadius());
            const CAircraftSituationList situationsBeforeStoring = this->remoteAircraftSituations(callsign);
            const CAircraftSituation situationWithElvBeforeStoring =
                situationsBeforeStoring.findClosestElevationWithinRange(correctedSituation, dpt);
            if (situationWithElvBeforeStoring.transferGroundElevationFromMe(correctedSituation, dpt))
            {
                // from nearby situations of own aircraft, data was transferred above
                // we use transfer first as it is slightly faster as cache
            }
            else
            {
                // from cache
                const CLength distance(correctedSituation.getDistancePerTime250ms(
                    CElevationPlane::singlePointRadius())); // distance per ms
                const CElevationPlane ep = this->findClosestElevationWithinRange(correctedSituation, distance);
                needToRequestElevation = ep.isNull();
                Q_ASSERT_X(needToRequestElevation || !ep.getRadius().isNull(), Q_FUNC_INFO, "null radius");
 
                // also can handle NULL elevations
                correctedSituation.setGroundElevation(ep, CAircraftSituation::FromCache);
            }
 
            // we have a new situation, so we try to get the elevation
            // we will requested it, but we set it upfront either by
            //
            // a) average value from other planes in the vicinity (cache, not moving) or
            // b) by extrapolating
            //
            // if we would NOT preset it, we could end up with oscillation
            //
            if (!correctedSituation.hasGroundElevation())
            {
                // average elevation
                // 1) from cache
                // 2) from planes on ground not moving
                bool fromNonMoving = false;
                bool triedExtrapolation = false;
                bool couldNotExtrapolate = false;
                int fromWhere = -1; // debugging
 
                CElevationPlane averagePlane =
                    this->averageElevationOfOnGroundAircraft(situation, CElevationPlane::minorAirportRadius(), 2, 3);
                if (averagePlane.isNull())
                {
                    averagePlane = this->averageElevationOfNonMovingAircraft(
                        situation, CElevationPlane::minorAirportRadius(), 2, 3);
                    fromNonMoving = true;
                }
 
                // do we have an elevation yet?
                if (!averagePlane.isNull())
                {
                    correctedSituation.setGroundElevation(averagePlane, CAircraftSituation::Average);
                    if (fromNonMoving) { m_foundInNonMovingAircraft++; }
                    else { m_foundInElevationsOnGnd++; }
                    fromWhere = 10;
                }
                else
                {
                    // values before updating (i.e. "storing") so the new situation is not yet considered
                    if (situationsBeforeStoring.size() > 1)
                    {
                        const bool extrapolated =
                            extrapolateElevation(correctedSituation, situationsBeforeStoring[0],
                                                 situationsBeforeStoring[1], changesBeforeStoring);
                        triedExtrapolation = true;
                        couldNotExtrapolate = !extrapolated;
                        fromWhere = 20;
                    }
                }
                Q_UNUSED(fromWhere)
 
                // still no elevation
                if (!correctedSituation.hasGroundElevation())
                {
                    if (CBuildConfig::isLocalDeveloperDebugBuild())
                    {
                        // experimental, could become ASSERT
                        SWIFT_VERIFY_X(needToRequestElevation, Q_FUNC_INFO, "Request should already be set");
                    }
                    needToRequestElevation = true; // should be "true" already
 
                    Q_UNUSED(triedExtrapolation)
                    Q_UNUSED(couldNotExtrapolate)
                }
                else
                {
                    // sanity check on the situation
                    if (CBuildConfig::isLocalDeveloperDebugBuild())
                    {
                        SWIFT_VERIFY_X(!correctedSituation.getGroundElevation().isZeroEpsilonConsidered(), Q_FUNC_INFO,
                                       "Suspicious elevation");
                    }
                }
            } // gnd. elevation
        }
        while (false); // do we need elevation, find on
 
        // do we already have ground details?
        if (situation.getOnGroundInfo().getGroundDetails() == COnGroundInfo::NotSetGroundDetails)
        {
            const CClient client = this->getClientOrDefaultForCallsign(callsign);
            if (client.hasCapability(CClient::FsdWithGroundFlag))
            {
                // we rely on situation gnd.flag
                correctedSituation.setOnGroundDetails(COnGroundInfo::InFromNetwork);
            }
            else if (client.hasCapability(CClient::FsdWithAircraftConfig))
            {
                const CAircraftPartsList parts = this->remoteAircraftParts(callsign);
                if (!parts.isEmpty()) { correctedSituation.adjustGroundFlag(parts, true); }
            }
        }
 
        // CG from provider
        const CLength cg = this->getSimulatorOrDbCG(
            callsign,
            this->getCGFromDB(
                callsign)); // always x-check against simulator to override guessed values and reflect changed CGs
        if (!cg.isNull()) { correctedSituation.setCG(cg); }
 
        // store corrected situation
        correctedSituation = CRemoteAircraftProvider::storeAircraftSituation(correctedSituation,
                                                                             false); // we already added offset if any
 
        // check if we need want to request
        if (needToRequestElevation && !canLikelySkipNearGround)
        {
            // we have not requested so far, but we are NEAR ground
            // we expect at least not transferred cache or we are moving and have no provider elevation yet
            if (correctedSituation.isOtherElevationInfoBetter(CAircraftSituation::FromCache, false) ||
                (correctedSituation.isMoving() &&
                 correctedSituation.isOtherElevationInfoBetter(CAircraftSituation::FromProvider, false)))
            {
                needToRequestElevation = this->requestElevation(correctedSituation);
            }
        }
 
        Q_UNUSED(needToRequestElevation)
        return correctedSituation;
    }
 
    void CAirspaceMonitor::sendInitialAtcQueries(const CCallsign &callsign)
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        m_fsdClient->sendClientQueryRealName(callsign);
        m_fsdClient->sendClientQueryAtis(callsign); // request ATIS and voice rooms
        m_fsdClient->sendClientQueryCapabilities(callsign);
        m_fsdClient->sendClientQueryServer(callsign);
    }
 
    void CAirspaceMonitor::queryAllOnlineAtcStations()
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
        const CAtcStationList onlineStations = this->getAtcStationsOnlineRecalculated();
        for (const CAtcStation &station : onlineStations)
        {
            const CCallsign cs = station.getCallsign();
            if (cs.isEmpty()) { continue; }
            m_fsdClient->sendClientQueryRealName(cs);
        }
    }
 
    bool CAirspaceMonitor::sendNextStaggeredAtisQuery()
    {
        if (m_queryAtis.isEmpty()) { return false; }
        if (!this->isConnectedAndNotShuttingDown()) { return false; }
        const CCallsign cs = m_queryAtis.dequeue();
        if (!m_atcStationsOnline.containsCallsign(cs)) { return false; }
        m_fsdClient->sendClientQueryAtis(cs);
        return true;
    }
 
    void CAirspaceMonitor::sendInitialPilotQueries(const CCallsign &callsign, bool withIcaoQuery, bool withFsInn)
    {
        if (!this->isConnectedAndNotShuttingDown()) { return; }
 
        if (withIcaoQuery) { m_fsdClient->sendPlaneInfoRequest(callsign); }
        if (withFsInn) { m_fsdClient->sendPlaneInfoRequestFsinn(callsign); }
 
        m_fsdClient->sendClientQueryCom1Freq(callsign);
        m_fsdClient->sendClientQueryRealName(callsign);
        m_fsdClient->sendClientQueryCapabilities(callsign);
        m_fsdClient->sendClientQueryServer(callsign);
    }
 
    bool CAirspaceMonitor::sendNextStaggeredPilotDataQuery()
    {
        if (m_queryPilot.isEmpty()) { return false; }
        if (!this->isConnectedAndNotShuttingDown()) { return false; }
        const CCallsign cs = m_queryPilot.dequeue();
        if (!this->isAircraftInRange(cs)) { return false; }
        m_fsdClient->sendClientQueryCom1Freq(cs);
 
        // we only query ICAO if we have none yet
        // it happens sometimes with some FSD servers (e.g our testserver) a first query is skipped
        // Important: this is only a workaround and must not replace a sendInitialPilotQueries
        if (!this->getAircraftInRangeForCallsign(cs).hasAircraftDesignator()) { m_fsdClient->sendPlaneInfoRequest(cs); }
        return true;
    }
 
    bool CAirspaceMonitor::isConnected() const
    {
        return m_fsdClient && m_fsdClient->getConnectionStatus().isConnected();
    }
 
    bool CAirspaceMonitor::isConnectedAndNotShuttingDown() const
    {
        if (!sApp || sApp->isShuttingDown()) { return false; }
        return this->isConnected();
    }
 
    const CServer &CAirspaceMonitor::getConnectedServer() const
    {
        static const CServer empty;
        if (!this->isConnected()) { return empty; }
        return m_fsdClient->getServer();
    }
 
    const CEcosystem &CAirspaceMonitor::getCurrentEcosystem() const
    {
        return this->getConnectedServer().getEcosystem();
    }
 
    bool CAirspaceMonitor::supportsVatsimDataFile() const
    {
        const bool dataFile =
            sApp && sApp->getWebDataServices() && sApp->getWebDataServices()->getVatsimDataFileReader();
        return dataFile && this->getConnectedServer().getEcosystem().isSystem(CEcosystem::VATSIM);
    }
 
    CLength CAirspaceMonitor::calculateDistanceToOwnAircraft(const CAircraftSituation &situation) const
    {
        CLength distance = this->getOwnAircraft().calculateGreatCircleDistance(situation);
        distance.switchUnit(CLengthUnit::NM());
        return distance;
    }
 
    CAngle CAirspaceMonitor::calculateBearingToOwnAircraft(const CAircraftSituation &situation) const
    {
        CAngle angle = this->getOwnAircraft().calculateBearing(situation);
        angle.switchUnit(CAngleUnit::deg());
        return angle;
    }
 
    bool CAirspaceMonitor::isCopilotAircraft(const CCallsign &callsign) const
    {
        if (!sApp || sApp->isShuttingDown() || !sApp->getIContextNetwork()) { return false; }
 
        // It is only relevant if we are logged in as observer
        if (sApp->getIContextNetwork()->getLoginMode() != swift::misc::network::CLoginMode::Observer) { return false; }
 
        const CCallsign ownCallsign = this->getOwnAircraft().getCallsign();
        return ownCallsign.isMaybeCopilotCallsign(callsign);
    }
 
    CAirspaceMonitor::FsInnPacket::FsInnPacket(const QString &aircraftIcaoDesignator,
                                               const QString &airlineIcaoDesignator, const QString &combinedCode,
                                               const QString &modelString)
        : aircraftIcaoDesignator(aircraftIcaoDesignator.trimmed().toUpper()),
          airlineIcaoDesignator(airlineIcaoDesignator.trimmed().toUpper()),
          combinedCode(combinedCode.trimmed().toUpper()), modelString(modelString.trimmed())
    {}
 
} // namespace swift::core