feat(Core/Scripting): implement OnlyOnceAreaTrigger & Zul'Gurub's in… (#8850)

Co-authored-by: Treeston <treeston.mmoc@gmail.com>

src/server/scripts/EasternKingdoms/ZulGurub/boss_hakkar.cpp

@@ -24,6 +24,7 @@ Category: Zul'Gurub
 
 #include "ScriptedCreature.h"
 #include "ScriptMgr.h"
+#include "Player.h"
 #include "zulgurub.h"
 
 enum Says
@@ -175,7 +176,35 @@ public:
     }
 };
 
+class at_zulgurub_entrance_speech : public OnlyOnceAreaTriggerScript
+{
+public:
+    at_zulgurub_entrance_speech() : OnlyOnceAreaTriggerScript("at_zulgurub_entrance_speech") {}
+
+    bool _OnTrigger(Player* player, const AreaTrigger* /*at*/) override
+    {
+        if (InstanceScript* instance = player->GetInstanceScript())
+        {
+            // Instance map's enormous, Hakkar's GRID is not loaded by the time players enter.
+            // Without this, the creature never says anything, because it doesn't load in time.
+            player->GetMap()->LoadGrid(-11783.99f, -1655.27f);
+
+            if (Creature* hakkar = ObjectAccessor::GetCreature(*player, instance->GetGuidData(DATA_HAKKAR)))
+            {
+                hakkar->setActive(true);
+                if (hakkar->GetAI())
+                {
+                    hakkar->AI()->Talk(SAY_PROTECT_ALTAR);
+                }
+            }
+            return false;
+        }
+        return false;
+    }
+};
+
 void AddSC_boss_hakkar()
 {
     new boss_hakkar();
+    new at_zulgurub_entrance_speech();
 }

src/server/scripts/EasternKingdoms/ZulGurub/instance_zulgurub.cpp

@@ -73,6 +73,9 @@ public:
                 case NPC_ARLOKK:
                     _arlokkGUID = creature->GetGUID();
                     break;
+                case NPC_HAKKAR:
+                    _hakkarGUID = creature->GetGUID();
+                    break;
             }
         }
 
@@ -123,6 +126,8 @@ public:
                     return _arlokkGUID;
                 case GO_GONG_OF_BETHEKK:
                     return _goGongOfBethekkGUID;
+                case DATA_HAKKAR:
+                    return _hakkarGUID;
             }
 
             return ObjectGuid::Empty;
@@ -181,6 +186,7 @@ public:
         ObjectGuid _vilebranchSpeakerGUID;
         ObjectGuid _arlokkGUID;
         ObjectGuid _goGongOfBethekkGUID;
+        ObjectGuid _hakkarGUID;
     };
 
     InstanceScript* GetInstanceScript(InstanceMap* map) const override

src/server/scripts/EasternKingdoms/ZulGurub/zulgurub.h

@@ -57,7 +57,8 @@ enum CreatureIds
     NPC_MANDOKIR            = 11382, // Mandokir Event
     NPC_OHGAN               = 14988, // Mandokir Event
     NPC_VILEBRANCH_SPEAKER  = 11391, // Mandokir Event
-    NPC_CHAINED_SPIRT       = 15117  // Mandokir Event
+    NPC_CHAINED_SPIRT       = 15117,  // Mandokir Event
+    NPC_HAKKAR              = 14834
 };
 
 enum GameobjectIds