Core/Threat: Re-add fixtate system. I am being told Netherspite needs it.

(cherry picked from commit fd33b1cd02a1c69fc78f47f079eadc43c331d054)

2 files changed, 36 insertions, 1 deletions

diff --git a/src/server/game/Combat/ThreatManager.cpp b/src/server/game/Combat/ThreatManager.cpp
index ad1c513ffd1..82e98c91dbf 100644
--- a/src/server/game/Combat/ThreatManager.cpp
+++ b/src/server/game/Combat/ThreatManager.cpp
@@ -459,10 +459,36 @@ void ThreatManager::ClearAllThreat()
     while (!_myThreatListEntries.empty());
 }
 
+void ThreatManager::FixtateTarget(Unit* target)
+{
+    if (target)
+    {
+        auto it = _myThreatListEntries.find(target->GetGUID());
+        if (it != _myThreatListEntries.end())
+        {
+            _fixtateRef = it->second;
+            return;
+        }
+    }
+    _fixtateRef = nullptr;
+}
+
+Unit* ThreatManager::GetFixtateTarget() const
+{
+    if (_fixtateRef)
+        return _fixtateRef->GetVictim();
+    else
+        return nullptr;
+}
+
 ThreatReference const* ThreatManager::ReselectVictim()
 {
+    // fixtated target is always preferred
+    if (_fixtateRef && _fixtateRef->IsAvailable())
+        return _fixtateRef;
+
     ThreatReference const* oldVictimRef = _currentVictimRef;
-    if (oldVictimRef && !oldVictimRef->IsAvailable())
+    if (oldVictimRef && oldVictimRef->IsOffline())
         oldVictimRef = nullptr;
     // in 99% of cases - we won't need to actually look at anything beyond the first element
     ThreatReference const* highest = _sortedThreatList.top();
@@ -705,6 +731,8 @@ void ThreatManager::PurgeThreatListRef(ObjectGuid const& guid, bool sendRemove)
 
     if (_currentVictimRef == ref)
         _currentVictimRef = nullptr;
+    if (_fixtateRef == ref)
+        _fixtateRef = nullptr;
 
     _sortedThreatList.erase(ref->_handle);
     if (sendRemove && ref->IsAvailable())
diff --git a/src/server/game/Combat/ThreatManager.h b/src/server/game/Combat/ThreatManager.h
index a10807cb061..a3755fdf167 100644
--- a/src/server/game/Combat/ThreatManager.h
+++ b/src/server/game/Combat/ThreatManager.h
@@ -160,6 +160,12 @@ class TC_GAME_API ThreatManager
         // Removes all targets from the threat list (will cause evade in UpdateVictim if called)
         void ClearAllThreat();
 
+        // Fixtate on the passed target; this target will always be selected until the fixtate is cleared
+        // (if the target is not in the threat list, does nothing)
+        void FixtateTarget(Unit* target);
+        void ClearFixtate() { FixtateTarget(nullptr); }
+        Unit* GetFixtateTarget() const;
+
         // sends SMSG_THREAT_UPDATE to all nearby clients (used by client to forward threat list info to addons)
         void SendThreatListToClients() const;
 
@@ -204,6 +210,7 @@ class TC_GAME_API ThreatManager
         std::unordered_map<ObjectGuid, ThreatReference*> _myThreatListEntries;
         ThreatReference const* _currentVictimRef;
         ThreatReference const* ReselectVictim();
+        ThreatReference const* _fixtateRef;
 
         ///== OTHERS' THREAT LISTS ==
         void PutThreatenedByMeRef(ObjectGuid const& guid, ThreatReference* ref);