Core/Object: Implement FindNearestCreatureWithAura (#28410)

* Game/Object: Implement NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck class and FindNearestCreatureWithAura method

* moved arguments

(cherry picked from commit 9a3e29d416162a84dd6a11c5e248f5f65e98a604)

3 files changed, 43 insertions, 0 deletions

diff --git a/src/server/game/Entities/Object/Object.cpp b/src/server/game/Entities/Object/Object.cpp
index 31ba39d5a23..b944d94a666 100644
--- a/src/server/game/Entities/Object/Object.cpp
+++ b/src/server/game/Entities/Object/Object.cpp
@@ -2126,6 +2126,15 @@ Creature* WorldObject::FindNearestCreature(uint32 entry, float range, bool alive
     return creature;
 }
 
+Creature* WorldObject::FindNearestCreatureWithAura(uint32 entry, uint32 spellId, float range, bool alive) const
+{
+    Creature* creature = nullptr;
+    Trinity::NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck checker(*this, entry, spellId, alive, range);
+    Trinity::CreatureLastSearcher<Trinity::NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck> searcher(this, creature, checker);
+    Cell::VisitAllObjects(this, searcher, range);
+    return creature;
+}
+
 GameObject* WorldObject::FindNearestGameObject(uint32 entry, float range, bool spawnedOnly) const
 {
     GameObject* go = nullptr;
diff --git a/src/server/game/Entities/Object/Object.h b/src/server/game/Entities/Object/Object.h
index b3cd579df89..ac9a4dae5ee 100644
--- a/src/server/game/Entities/Object/Object.h
+++ b/src/server/game/Entities/Object/Object.h
@@ -426,6 +426,7 @@ class TC_GAME_API WorldObject : public Object, public WorldLocation
         void SummonCreatureGroup(uint8 group, std::list<TempSummon*>* list = nullptr);
 
         Creature*   FindNearestCreature(uint32 entry, float range, bool alive = true) const;
+        Creature*   FindNearestCreatureWithAura(uint32 entry, uint32 spellId, float range, bool alive = true) const;
         GameObject* FindNearestGameObject(uint32 entry, float range, bool spawnedOnly = true) const;
         GameObject* FindNearestUnspawnedGameObject(uint32 entry, float range) const;
         GameObject* FindNearestGameObjectOfType(GameobjectTypes type, float range) const;
diff --git a/src/server/game/Grids/Notifiers/GridNotifiers.h b/src/server/game/Grids/Notifiers/GridNotifiers.h
index 3603c2667e2..ef473e63e9d 100644
--- a/src/server/game/Grids/Notifiers/GridNotifiers.h
+++ b/src/server/game/Grids/Notifiers/GridNotifiers.h
@@ -1398,6 +1398,39 @@ namespace Trinity
             NearestCreatureEntryWithLiveStateInObjectRangeCheck(NearestCreatureEntryWithLiveStateInObjectRangeCheck const&) = delete;
     };
 
+    class NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck
+    {
+        public:
+            NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck(WorldObject const& obj, uint32 entry, uint32 spellId, bool alive, float range)
+                : i_obj(obj), i_entry(entry), i_spellId(spellId), i_alive(alive), i_range(range) { }
+
+        bool operator()(Creature* u)
+        {
+            if (u->getDeathState() != DEAD
+                && u->GetEntry() == i_entry
+                && u->HasAura(i_spellId)
+                && u->IsAlive() == i_alive
+                && u->GetGUID() != i_obj.GetGUID()
+                && i_obj.IsWithinDistInMap(u, i_range)
+                && u->CheckPrivateObjectOwnerVisibility(&i_obj))
+            {
+                i_range = i_obj.GetDistance(u);         // use found unit range as new range limit for next check
+                return true;
+            }
+            return false;
+        }
+
+    private:
+        WorldObject const& i_obj;
+        uint32 i_entry;
+        uint32 i_spellId;
+        bool   i_alive;
+        float  i_range;
+
+        // prevent clone this object
+        NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck(NearestCreatureEntryWithLiveStateAndAuraInObjectRangeCheck const&) = delete;
+    };
+
     class AnyPlayerInObjectRangeCheck
     {
         public: