From 1051cc5751c2ea3a01e7b929003442285c5ea9ae Mon Sep 17 00:00:00 2001
From: Roland Rossgotterer <roland.rossgotterer@gmail.com>
Date: Wed, 16 Oct 2019 16:24:30 +0200
Subject: [PATCH] [AFV] Add fuzzy callsign matching before aliasing a HF
 station

# Conflicts:
#	src/blackcore/afv/clients/afvclient.h
---
 src/blackcore/afv/clients/afvclient.cpp | 40 +++++++++++++++++++++++--
 src/blackcore/afv/clients/afvclient.h   |  3 ++
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/src/blackcore/afv/clients/afvclient.cpp b/src/blackcore/afv/clients/afvclient.cpp
index 5d22ebb3f..197917ef1 100644
--- a/src/blackcore/afv/clients/afvclient.cpp
+++ b/src/blackcore/afv/clients/afvclient.cpp
@@ -943,13 +943,49 @@ namespace BlackCore
 
                     if (it != m_aliasedStations.end())
                     {
-                        CLogMessage(this).debug(u"Aliasing %1Hz [VHF] to %2Hz [HF]")  << frequencyHz << it->frequencyHz;
-                        roundedFrequencyHz = it->frequencyHz;
+                        if (sApp->getIContextNetwork())
+                        {
+                            // Get the callsign for this frequency and fuzzy compare with our alias station
+                            const CComSystem::ChannelSpacing spacing = CComSystem::ChannelSpacing25KHz;
+                            CFrequency f(static_cast<int>(roundedFrequencyHz), CFrequencyUnit::Hz());
+                            CAtcStationList matchingAtcStations = sApp->getIContextNetwork()->getOnlineStationsForFrequency(f, spacing);
+                            CAtcStation closest = matchingAtcStations.findClosest(1, sApp->getIContextOwnAircraft()->getOwnAircraftSituation().getPosition()).frontOrDefault();
+
+                            if (fuzzyMatchCallSign(it->name, closest.getCallsign().asString()))
+                            {
+                                CLogMessage(this).debug(u"Aliasing %1Hz [VHF] to %2Hz [HF]")  << frequencyHz << it->frequencyHz;
+                                roundedFrequencyHz = it->frequencyHz;
+                            }
+                        }
+                        else
+                        {
+                            CLogMessage(this).debug(u"Aliasing %1Hz [VHF] to %2Hz [HF]")  << frequencyHz << it->frequencyHz;
+                            roundedFrequencyHz = it->frequencyHz;
+                        }
                     }
                 }
                 return roundedFrequencyHz;
             }
 
+            bool CAfvClient::fuzzyMatchCallSign(const QString &callsign, const QString &compareTo) const
+            {
+                QString prefixA;
+                QString suffixA;
+                QString prefixB;
+                QString suffixB;
+                getPrefixSuffix(callsign, prefixA, suffixA);
+                getPrefixSuffix(compareTo, prefixB, suffixB);
+                return (prefixA == prefixB) && (suffixA == suffixB);
+            }
+
+            void CAfvClient::getPrefixSuffix(const QString &callsign, QString &prefix, QString &suffix) const
+            {
+                QRegularExpression separator("[(-|_)]");
+                QStringList parts = callsign.split(separator);
+                prefix = parts.first();
+                suffix = parts.last();
+            }
+
             quint16 CAfvClient::comUnitToTransceiverId(CComSystem::ComUnit comUnit)
             {
                 switch (comUnit)
diff --git a/src/blackcore/afv/clients/afvclient.h b/src/blackcore/afv/clients/afvclient.h
index d41889f4a..339c141a7 100644
--- a/src/blackcore/afv/clients/afvclient.h
+++ b/src/blackcore/afv/clients/afvclient.h
@@ -292,6 +292,9 @@ namespace BlackCore
                 //! \threadsafe
                 quint32 getAliasFrequencyHz(quint32 frequencyHz) const;
 
+                bool fuzzyMatchCallSign(const QString &callsign, const QString &compareTo) const;
+                void getPrefixSuffix(const QString &callsign, QString &prefix, QString &suffix) const;
+
                 static constexpr int PositionUpdatesMs = 20000; //!< position timer
                 static constexpr int SampleRate   = 48000;
                 static constexpr int FrameSize    = static_cast<int>(SampleRate * 0.02); //!< 20ms