Game/AI: Implement new targettype SMART_TARGET_CLOSEST_UNSPAWNED_GAMEOBJECT

Port From (https://github.com/TrinityCore/TrinityCore/commit/db825c3221de16cdb757711781318d76b414213f)

Source/Framework/Constants/SmartAIConst.cs

@@ -435,7 +435,7 @@ namespace Framework.Constants
         LootRecipients = 27,   // all players that have tagged this creature (for kill credit)
         Farthest = 28,   // maxDist, playerOnly, isInLos
         VehiclePassenger = 29,   // seatMask (0 - all seats)
-        SpellTarget = 30,
+        ClosestUnspawnedGameobject = 30,
 
         End = 31
     }

Source/Game/AI/CoreAI/CreatureAI.cs

@@ -493,17 +493,17 @@ namespace Game.AI
         public virtual void SpellHitTarget(Unit target, SpellInfo spellInfo) { }
         public virtual void SpellHitTargetGameObject(GameObject target, SpellInfo spellInfo) { }
 
-        // Should return true if the NPC is currently being escorted
-        public virtual bool IsEscorted() { return false; }
-
-        public virtual void MovementInform(MovementGeneratorType type, uint id) { }
-
         // Called when a spell cast gets interrupted
         public virtual void OnSpellCastInterrupt(SpellInfo spell) { }
 
         // Called when a spell cast has been successfully finished
         public virtual void OnSuccessfulSpellCast(SpellInfo spell) { }
 
+        // Should return true if the NPC is currently being escorted
+        public virtual bool IsEscorted() { return false; }
+
+        public virtual void MovementInform(MovementGeneratorType type, uint id) { }
+
         // Called at reaching home after evade
         public virtual void JustReachedHome() { }
 

Source/Game/AI/SmartScripts/SmartAIManager.cs

@@ -513,7 +513,7 @@ namespace Game.AI
                 case SmartTargets.LootRecipients:
                 case SmartTargets.Farthest:
                 case SmartTargets.VehiclePassenger:
-                case SmartTargets.SpellTarget:
+                case SmartTargets.ClosestUnspawnedGameobject:
                     break;
                 default:
                     Log.outError(LogFilter.ScriptsAi, "SmartAIMgr: Not handled target_type({0}), Entry {1} SourceType {2} Event {3} Action {4}, skipped.", e.GetTargetType(), e.EntryOrGuid, e.GetScriptType(), e.EventId, e.GetActionType());

Source/Game/AI/SmartScripts/SmartScript.cs

@@ -2006,7 +2006,8 @@ namespace Game.AI
                                      e.GetTargetType() == SmartTargets.GameobjectGuid || e.GetTargetType() == SmartTargets.GameobjectDistance ||
                                      e.GetTargetType() == SmartTargets.ClosestCreature || e.GetTargetType() == SmartTargets.ClosestGameobject ||
                                      e.GetTargetType() == SmartTargets.OwnerOrSummoner || e.GetTargetType() == SmartTargets.ActionInvoker ||
-                                     e.GetTargetType() == SmartTargets.ClosestEnemy || e.GetTargetType() == SmartTargets.ClosestFriendly)
+                                     e.GetTargetType() == SmartTargets.ClosestEnemy || e.GetTargetType() == SmartTargets.ClosestFriendly ||
+                                     e.GetTargetType() == SmartTargets.ClosestUnspawnedGameobject)
                             {
                                 target.ToCreature().SetHomePosition(target.GetPositionX(), target.GetPositionY(), target.GetPositionZ(), target.GetOrientation());
                             }
@@ -3089,6 +3090,13 @@ namespace Game.AI
                     }
                     break;
                 }
+                case SmartTargets.ClosestUnspawnedGameobject:
+                {
+                    GameObject target = baseObject.FindNearestUnspawnedGameObject(e.Target.closest.entry, (float)(e.Target.closest.dist != 0 ? e.Target.closest.dist : 100));
+                    if (target != null)
+                        targets.Add(target);
+                    break;
+                }
                 case SmartTargets.Position:
                 default:
                     break;

Source/Game/Entities/Object/WorldObject.cs

@@ -1540,6 +1540,15 @@ namespace Game.Entities
             return searcher.GetTarget();
         }
 
+        public GameObject FindNearestUnspawnedGameObject(uint entry, float range)
+        {
+            NearestUnspawnedGameObjectEntryInObjectRangeCheck checker = new(this, entry, range);
+            GameObjectLastSearcher searcher = new(this, checker);
+
+            Cell.VisitGridObjects(this, searcher, range);
+            return searcher.GetTarget();
+        }
+
         public GameObject FindNearestGameObjectOfType(GameObjectTypes type, float range)
         {
             var checker = new NearestGameObjectTypeInObjectRangeCheck(this, type, range);

Source/Game/Maps/GridNotifiers.cs

@@ -2772,6 +2772,31 @@ namespace Game.Maps
         float i_range;
     }
 
+    // Success at unit in range, range update for next check (this can be use with GameobjectLastSearcher to find nearest unspawned GO)
+    class NearestUnspawnedGameObjectEntryInObjectRangeCheck : ICheck<GameObject>
+    {
+        WorldObject i_obj;
+        uint i_entry;
+        float i_range;
+
+        public NearestUnspawnedGameObjectEntryInObjectRangeCheck(WorldObject obj, uint entry, float range)
+        {
+            i_obj = obj;
+            i_entry = entry;
+            i_range = range;
+        }
+
+        public bool Invoke(GameObject go)
+        {
+            if (!go.IsSpawned() && go.GetEntry() == i_entry && go.GetGUID() != i_obj.GetGUID() && i_obj.IsWithinDistInMap(go, i_range))
+            {
+                i_range = i_obj.GetDistance(go);        // use found GO range as new range limit for next check
+                return true;
+            }
+            return false;
+        }
+    }
+    
     // Success at unit in range, range update for next check (this can be use with GameobjectLastSearcher to find nearest GO with a certain type)
     class NearestGameObjectTypeInObjectRangeCheck : ICheck<GameObject>
     {