fix(Core/Spells): Far Sight auras are supposed to extend view distance and allows seeing objects from further distance (#7068)

- Closes #5793.

src/server/game/Entities/Object/Object.cpp

@@ -1670,6 +1670,11 @@ bool WorldObject::CanSeeOrDetect(WorldObject const* obj, bool ignoreStealth, boo
 
             if (thisPlayer->GetViewpoint())
                 viewpoint = thisPlayer->GetViewpoint();
+
+            if (thisPlayer->GetFarSightDistance() && !thisPlayer->isInFront(obj))
+            {
+                return false;
+            }
         }
 
         // Xinef: check reversely obj vs viewpoint, object could be a gameObject which overrides _IsWithinDist function to include gameobject size

src/server/game/Entities/Object/Object.h

@@ -919,7 +919,7 @@ public:
 
     [[nodiscard]] float GetGridActivationRange() const;
     [[nodiscard]] float GetVisibilityRange() const;
-    float GetSightRange(const WorldObject* target = nullptr) const;
+    virtual float GetSightRange(const WorldObject* target = nullptr) const;
     //bool CanSeeOrDetect(WorldObject const* obj, bool ignoreStealth = false, bool distanceCheck = false) const;
     bool CanSeeOrDetect(WorldObject const* obj, bool ignoreStealth = false, bool distanceCheck = false, bool checkAlert = false) const;
 

src/server/game/Entities/Player/Player.cpp

@@ -15154,3 +15154,29 @@ void Player::SetServerSideVisibilityDetect(ServerSideVisibilityType type, Accoun
 
     m_serverSideVisibilityDetect.SetValue(type, sec);
 }
+
+void Player::SetFarSightDistance(float radius)
+{
+    _farSightDistance = radius;
+}
+
+void Player::ResetFarSightDistance()
+{
+    _farSightDistance.reset();
+}
+
+Optional<float> Player::GetFarSightDistance() const
+{
+    return _farSightDistance;
+}
+
+float Player::GetSightRange(const WorldObject* target) const
+{
+    float sightRange = WorldObject::GetSightRange(target);
+    if (_farSightDistance)
+    {
+        sightRange += *_farSightDistance;
+    }
+
+    return sightRange;
+}

src/server/game/Entities/Player/Player.h

@@ -17,6 +17,7 @@
 #include "KillRewarder.h"
 #include "MapReference.h"
 #include "ObjectMgr.h"
+#include "Optional.h"
 #include "PetDefines.h"
 #include "PlayerTaxi.h"
 #include "QuestDef.h"
@@ -2521,7 +2522,13 @@ public:
     std::string GetMapAreaAndZoneString();
     std::string GetCoordsMapAreaAndZoneString();
 
-protected:
+    void SetFarSightDistance(float radius);
+    void ResetFarSightDistance();
+    Optional<float> GetFarSightDistance() const;
+
+    float GetSightRange(const WorldObject* target = nullptr) const override;
+
+ protected:
     // Gamemaster whisper whitelist
     WhisperListContainer WhisperList;
 
@@ -2874,6 +2881,8 @@ private:
     Creature* m_CinematicObject;
 
     WorldLocation _corpseLocation;
+
+    Optional<float> _farSightDistance = { };
 };
 
 void AddItemsSetItem(Player* player, Item* item);

src/server/game/Entities/Unit/Unit.cpp

@@ -19173,8 +19173,13 @@ bool Unit::UpdatePosition(float x, float y, float z, float orientation, bool tel
             GetMap()->CreatureRelocation(ToCreature(), x, y, z, orientation);
     }
     else if (turn)
+    {
         UpdateOrientation(orientation);
 
+        if (GetTypeId() == TYPEID_PLAYER && ToPlayer()->GetFarSightDistance())
+            UpdateObjectVisibility(false);
+    }
+
     return (relocated || turn);
 }
 
@@ -19687,24 +19692,31 @@ void Unit::ExecuteDelayedUnitRelocationEvent()
             if (active->IsVehicle())
                 active = player;
 
-            float dx = active->m_last_notify_position.GetPositionX() - active->GetPositionX();
-            float dy = active->m_last_notify_position.GetPositionY() - active->GetPositionY();
-            float dz = active->m_last_notify_position.GetPositionZ() - active->GetPositionZ();
-            float distsq = dx * dx + dy * dy + dz * dz;
+            if (!player->GetFarSightDistance())
+            {
+                float dx     = active->m_last_notify_position.GetPositionX() - active->GetPositionX();
+                float dy     = active->m_last_notify_position.GetPositionY() - active->GetPositionY();
+                float dz     = active->m_last_notify_position.GetPositionZ() - active->GetPositionZ();
+                float distsq = dx * dx + dy * dy + dz * dz;
 
-            float mindistsq = DynamicVisibilityMgr::GetReqMoveDistSq(active->FindMap()->GetEntry()->map_type);
-            if (distsq < mindistsq)
-                return;
+                float mindistsq = DynamicVisibilityMgr::GetReqMoveDistSq(active->FindMap()->GetEntry()->map_type);
+                if (distsq < mindistsq)
+                    return;
 
-            active->m_last_notify_position.Relocate(active->GetPositionX(), active->GetPositionY(), active->GetPositionZ());
+                active->m_last_notify_position.Relocate(active->GetPositionX(), active->GetPositionY(), active->GetPositionZ());
+            }
         }
 
         Acore::PlayerRelocationNotifier relocateNoLarge(*player, false); // visit only objects which are not large; default distance
         Cell::VisitAllObjects(viewPoint, relocateNoLarge, player->GetSightRange() + VISIBILITY_INC_FOR_GOBJECTS);
         relocateNoLarge.SendToSelf();
-        Acore::PlayerRelocationNotifier relocateLarge(*player, true);    // visit only large objects; maximum distance
-        Cell::VisitAllObjects(viewPoint, relocateLarge, MAX_VISIBILITY_DISTANCE);
-        relocateLarge.SendToSelf();
+
+        if (!player->GetFarSightDistance())
+        {
+            Acore::PlayerRelocationNotifier relocateLarge(*player, true); // visit only large objects; maximum distance
+            Cell::VisitAllObjects(viewPoint, relocateLarge, MAX_VISIBILITY_DISTANCE);
+            relocateLarge.SendToSelf();
+        }
 
         this->AddToNotify(NOTIFY_AI_RELOCATION);
     }