Core/Battlegrounds: Moved AreaSpiritHealer resurrection handling to respective npc flags

Port From (https://github.com/TrinityCore/TrinityCore/commit/205aba1ff3a6f1ff92a8b26af646fd25f139c697)

Source/Game/Entities/Creature/Creature.cs

@@ -427,6 +427,9 @@ namespace Game.Entities
         {
             if (IsAIEnabled() && triggerJustAppeared && m_deathState != DeathState.Dead)
             {
+                if (IsAreaSpiritHealer() && !IsAreaSpiritHealerIndividual())
+                    CastSpell(null, BattlegroundConst.SpellSpiritHealChannelAoE, false);
+
                 if (m_respawnCompatibilityMode && VehicleKit != null)
                     VehicleKit.Reset();
 
@@ -1129,6 +1132,19 @@ namespace Game.Entities
             SetHomePosition(GetPosition());
         }
 
+        public void SummonGraveyardTeleporter()
+        {
+            if (!IsAreaSpiritHealer())
+                return;
+
+            uint npcEntry = GetFaction() == (uint)FactionTemplates.AllianceGeneric ? 26350 : 26351u;
+
+            // maybe NPC is summoned with these spells:
+            // ID - 24237 Summon Alliance Graveyard Teleporter (SERVERSIDE)
+            // ID - 46894 Summon Horde Graveyard Teleporter (SERVERSIDE)
+            SummonCreature(npcEntry, GetPosition(), TempSummonType.TimedDespawn, TimeSpan.FromSeconds(1), 0, 0);
+        }
+
         public bool HasFlag(CreatureStaticFlags flag)  { return _staticFlags.HasFlag(flag); }
         public bool HasFlag(CreatureStaticFlags2 flag)  { return _staticFlags.HasFlag(flag); }
         public bool HasFlag(CreatureStaticFlags3 flag)  { return _staticFlags.HasFlag(flag); }

Source/Game/Entities/Player/Player.Fields.cs

@@ -55,6 +55,7 @@ namespace Game.Entities
         long m_lastHonorUpdateTime;
         uint m_contestedPvPTimer;
         bool _usePvpItemLevels;
+        ObjectGuid _areaSpiritHealerGUID;
 
         //Groups/Raids
         GroupReference m_group = new();

Source/Game/Entities/Player/Player.cs

@@ -3938,6 +3938,8 @@ namespace Game.Entities
 
         public void ResurrectPlayer(float restore_percent, bool applySickness = false)
         {
+            SetAreaSpiritHealer(null);
+
             DeathReleaseLoc packet = new();
             packet.MapID = -1;
             SendPacket(packet);
@@ -4021,6 +4023,44 @@ namespace Game.Entities
             }
         }
 
+        ObjectGuid GetSpiritHealerGUID() { return _areaSpiritHealerGUID; }
+        
+        public bool CanAcceptAreaSpiritHealFrom(Unit spiritHealer) { return spiritHealer.GetGUID() == _areaSpiritHealerGUID; }
+        
+        public void SetAreaSpiritHealer(Creature creature)
+        {
+            if (!creature)
+            {
+                _areaSpiritHealerGUID = ObjectGuid.Empty;
+                RemoveAurasDueToSpell(BattlegroundConst.SpellWaitingForResurrect);
+                return;
+            }
+
+            if (!creature.IsAreaSpiritHealer())
+                return;
+
+            _areaSpiritHealerGUID = creature.GetGUID();
+            CastSpell(null, BattlegroundConst.SpellWaitingForResurrect);
+        }
+
+        public void SendAreaSpiritHealerTime(Unit spiritHealer)
+        {
+            int timeLeft = 0;
+            Spell spell = spiritHealer.GetCurrentSpell(CurrentSpellTypes.Channeled);
+            if (spell != null)
+                timeLeft = spell.GetTimer();
+
+            SendAreaSpiritHealerTime(spiritHealer.GetGUID(), timeLeft);
+        }
+
+        public void SendAreaSpiritHealerTime(ObjectGuid spiritHealerGUID, int timeLeft)
+        {
+            AreaSpiritHealerTime areaSpiritHealerTime = new();
+            areaSpiritHealerTime.HealerGuid = spiritHealerGUID;
+            areaSpiritHealerTime.TimeLeft = (uint)timeLeft;
+            SendPacket(areaSpiritHealerTime);
+        }
+        
         public void KillPlayer()
         {
             if (IsFlying() && GetTransport() == null)

Source/Game/Entities/Unit/Unit.cs

@@ -466,6 +466,9 @@ namespace Game.Entities
 
             if (IsInWorld)
             {
+                if (IsAreaSpiritHealer())
+                    ToCreature()?.SummonGraveyardTeleporter();
+
                 m_duringRemoveFromWorld = true;
                 UnitAI ai = GetAI();
                 if (ai != null)
@@ -847,6 +850,7 @@ namespace Game.Entities
                 NPCFlags.AreaSpiritHealer | NPCFlags.TabardDesigner | NPCFlags.Auctioneer);
         }
         public bool IsSpiritService() { return HasNpcFlag(NPCFlags.SpiritHealer | NPCFlags.AreaSpiritHealer); }
+        public bool IsAreaSpiritHealerIndividual() { return HasNpcFlag2(NPCFlags2.AreaSpiritHealerIndividual); }
         public bool IsCritter() { return GetCreatureType() == CreatureType.Critter; }
         public bool IsInFlight() { return HasUnitState(UnitState.InFlight); }