Core/Loot: Set loot dungeon encounter id before generating

Port From (https://github.com/TrinityCore/TrinityCore/commit/5f1a4cf9044d9ad65b49eb859ec36e1f62c2be10)

Source/Game/AI/ScriptedAI/ScriptedAI.cs

@@ -547,16 +547,7 @@ namespace Game.AI
             summons.DespawnAll();
             _scheduler.CancelAll();
             if (instance != null)
-            {
-                if (me.loot != null)
-                {
-                    DungeonEncounterRecord dungeonEncounter = instance.GetBossDungeonEncounter(_bossId);
-                    if (dungeonEncounter != null)
-                        me.loot.SetDungeonEncounterId(dungeonEncounter.Id);
-                }
-
                 instance.SetBossState(_bossId, EncounterState.Done);
-            }
         }
 
         public void _JustEngagedWith(Unit who)
@@ -587,7 +578,7 @@ namespace Game.AI
             {
                 Unit target = pair.Value.GetOther(me);
                 if (target.IsControlledByPlayer() && !IsInBoundary(target))
-                        target.NearTeleportTo(x, y, z, 0);
+                    target.NearTeleportTo(x, y, z, 0);
             }
         }
 
@@ -689,6 +680,8 @@ namespace Game.AI
         public override bool CanAIAttack(Unit victim) { return IsInBoundary(victim); }
 
         public void _JustReachedHome() { me.SetActive(false); }
+
+        public uint GetBossId() { return _bossId; }
     }
 
     public class WorldBossAI : ScriptedAI

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -20,6 +20,7 @@ using Game.AI;
 using Game.BattleFields;
 using Game.BattleGrounds;
 using Game.Combat;
+using Game.DataStorage;
 using Game.Groups;
 using Game.Loots;
 using Game.Maps;
@@ -778,6 +779,14 @@ namespace Game.Entities
                     if (creature.GetMap().Is25ManRaid())
                         loot.maxDuplicates = 3;
 
+                    InstanceScript instance = creature.GetInstanceScript();
+                    if (instance != null)
+                    {
+                        DungeonEncounterRecord dungeonEncounter = instance.GetBossDungeonEncounter(creature);
+                        if (dungeonEncounter != null)
+                            loot.SetDungeonEncounterId(dungeonEncounter.Id);
+                    }
+
                     uint lootid = creature.GetCreatureTemplate().LootId;
                     if (lootid != 0)
                         loot.FillLoot(lootid, LootStorage.Creature, looter, false, false, creature.GetLootMode(), creature.GetMap().GetDifficultyLootItemContext());

Source/Game/Maps/Instances/InstanceScript.cs

@@ -16,18 +16,15 @@
  */
 
 using Framework.Constants;
-using Framework.Database;
-using Framework.IO;
+using Game.AI;
 using Game.DataStorage;
 using Game.Entities;
 using Game.Groups;
 using Game.Networking.Packets;
-using Game.Scenarios;
 using Game.Spells;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
 
 namespace Game.Maps
 {
@@ -703,6 +700,15 @@ namespace Game.Maps
         {
             return id < bosses.Count ? bosses[id].GetDungeonEncounterForDifficulty(instance.GetDifficultyID()) : null;
         }
+
+        public DungeonEncounterRecord GetBossDungeonEncounter(Creature creature)
+        {
+            BossAI bossAi = (BossAI)creature.GetAI();
+            if (bossAi != null)
+                return GetBossDungeonEncounter(bossAi.GetBossId());
+
+            return null;
+        }
         
         public virtual bool CheckAchievementCriteriaMeet(uint criteria_id, Player source, Unit target = null, uint miscvalue1 = 0)
         {

Source/Game/Spells/SpellEffects.cs

@@ -1259,6 +1259,7 @@ namespace Game.Spells
                                 loot = new(gameObjTarget.GetMap(), guid, loottype, groupRules ? group : null);
                                 gameObjTarget.loot = loot;
 
+                                loot.SetDungeonEncounterId(gameObjTarget.GetGoInfo().Chest.DungeonEncounter);
                                 loot.FillLoot(lootId, LootStorage.Gameobject, player, !groupRules, false, gameObjTarget.GetLootMode(), gameObjTarget.GetMap().GetDifficultyLootItemContext());
 
                                 if (gameObjTarget.GetLootMode() > 0)
@@ -1267,8 +1268,6 @@ namespace Game.Spells
                                     if (addon != null)
                                         loot.GenerateMoneyLoot(addon.Mingold, addon.Maxgold);
                                 }
-
-                                loot.SetDungeonEncounterId(gameObjTarget.GetGoInfo().Chest.DungeonEncounter);
                             }
 
                             /// @todo possible must be moved to loot release (in different from linked triggering)