Core/Spells: Implement spell queue

Port From (https://github.com/TrinityCore/TrinityCore/commit/27019a62a4294f8dd48d975f85b1907c5adee0e3)

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

@@ -110,6 +110,7 @@ namespace Game.Entities
         public Spell m_spellModTakingSpell;
         uint m_oldpetspell;
         Dictionary<uint, StoredAuraTeleportLocation> m_storedAuraTeleportLocations = new();
+        SpellCastRequest _pendingSpellCastRequest;
 
         //Mail
         List<Mail> m_mail = new();

Source/Game/Entities/Player/Player.Spells.cs

@@ -1433,7 +1433,7 @@ namespace Game.Entities
 
             return 0;
         }
-        
+
         int SkillGainChance(uint SkillValue, uint GrayLevel, uint GreenLevel, uint YellowLevel)
         {
             if (SkillValue >= GrayLevel)
@@ -1702,7 +1702,7 @@ namespace Game.Entities
 
             return -1;
         }
-        
+
         int FindEmptyProfessionSlotFor(uint skillId)
         {
             SkillLineRecord skillEntry = CliDB.SkillLineStorage.LookupByKey(skillId);
@@ -3759,6 +3759,269 @@ namespace Game.Entities
             SkillInfo skillInfo = m_values.ModifyValue(m_activePlayerData).ModifyValue(m_activePlayerData.Skill);
             SetUpdateFieldValue(ref skillInfo.ModifyValue(skillInfo.SkillPermBonus, (int)pos), bonus);
         }
+
+        public void RequestSpellCast(SpellCastRequest castRequest)
+        {
+            // We are overriding an already existing spell cast request so inform the client that the old cast is being replaced
+            if (_pendingSpellCastRequest != null)
+                CancelPendingCastRequest();
+
+            _pendingSpellCastRequest = castRequest;
+
+            // If we can process the cast request right now, do it.
+            if (CanExecutePendingSpellCastRequest())
+                ExecutePendingSpellCastRequest();
+        }
+
+        public void CancelPendingCastRequest()
+        {
+            if (_pendingSpellCastRequest == null)
+                return;
+
+            // We have to inform the client that the cast has been canceled. Otherwise the cast button will remain highlightened
+            CastFailed castFailed = new();
+            castFailed.CastID = _pendingSpellCastRequest.CastRequest.CastID;
+            castFailed.SpellID = (int)_pendingSpellCastRequest.CastRequest.SpellID;
+            castFailed.Reason = SpellCastResult.DontReport;
+            SendPacket(castFailed);
+
+            _pendingSpellCastRequest = null;
+        }
+
+        // A spell can be queued up within 400 milliseconds before global cooldown expires or the cast finishes
+        static TimeSpan SPELL_QUEUE_TIME_WINDOW = TimeSpan.FromMilliseconds(400);
+
+        public bool CanRequestSpellCast(SpellInfo spellInfo, Unit castingUnit)
+        {
+            if (castingUnit.GetSpellHistory().GetRemainingGlobalCooldown(spellInfo) > SPELL_QUEUE_TIME_WINDOW)
+                return false;
+
+            foreach (CurrentSpellTypes spellSlot in new[] { CurrentSpellTypes.Melee, CurrentSpellTypes.Generic })
+            {
+                Spell spell = GetCurrentSpell(spellSlot);
+                if (spell != null && TimeSpan.FromMilliseconds(spell.GetRemainingCastTime()) > SPELL_QUEUE_TIME_WINDOW)
+                    return false;
+            }
+
+            return true;
+        }
+
+        void ExecutePendingSpellCastRequest()
+        {
+            if (_pendingSpellCastRequest == null)
+                return;
+
+            TriggerCastFlags triggerFlag = TriggerCastFlags.None;
+
+            Unit castingUnit = _pendingSpellCastRequest.CastingUnitGUID == GetGUID() ? this : Global.ObjAccessor.GetUnit(this, _pendingSpellCastRequest.CastingUnitGUID);
+
+            // client provided targets
+            SpellCastTargets targets = new(castingUnit, _pendingSpellCastRequest.CastRequest);
+
+            // The spell cast has been requested by using an item. Handle the cast accordingly.
+            if (_pendingSpellCastRequest.ItemData != null)
+            {
+                if (ProcessItemCast(_pendingSpellCastRequest, targets))
+                    _pendingSpellCastRequest = null;
+                else
+                    CancelPendingCastRequest();
+                return;
+            }
+
+            // check known spell or raid marker spell (which not requires player to know it)
+            SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo(_pendingSpellCastRequest.CastRequest.SpellID, GetMap().GetDifficultyID());
+            Player plrCaster = castingUnit.ToPlayer();
+            if (plrCaster != null && !plrCaster.HasActiveSpell(spellInfo.Id) && !spellInfo.HasAttribute(SpellAttr8.SkipIsKnownCheck))
+            {
+                bool allow = false;
+
+                // allow casting of unknown spells for special lock cases
+                GameObject go = targets.GetGOTarget();
+                if (go != null && go.GetSpellForLock(plrCaster) == spellInfo)
+                    allow = true;
+
+                // allow casting of spells triggered by clientside periodic trigger auras
+                if (castingUnit.HasAuraTypeWithTriggerSpell(AuraType.PeriodicTriggerSpellFromClient, spellInfo.Id))
+                {
+                    allow = true;
+                    triggerFlag = TriggerCastFlags.FullMask;
+                }
+
+                if (!allow)
+                {
+                    CancelPendingCastRequest();
+                    return;
+                }
+            }
+
+            // Check possible spell cast overrides
+            spellInfo = castingUnit.GetCastSpellInfo(spellInfo, triggerFlag);
+            if (spellInfo.IsPassive())
+            {
+                CancelPendingCastRequest();
+                return;
+            }
+
+            // can't use our own spells when we're in possession of another unit
+            if (IsPossessing())
+            {
+                CancelPendingCastRequest();
+                return;
+            }
+
+            // Client is resending autoshot cast opcode when other spell is cast during shoot rotation
+            // Skip it to prevent "interrupt" message
+            // Also check targets! target may have changed and we need to interrupt current spell
+            if (spellInfo.IsAutoRepeatRangedSpell())
+            {
+                Spell currentSpell = castingUnit.GetCurrentSpell(CurrentSpellTypes.AutoRepeat);
+                if (currentSpell != null)
+                {
+                    if (currentSpell.m_spellInfo == spellInfo && currentSpell.m_targets.GetUnitTargetGUID() == targets.GetUnitTargetGUID())
+                    {
+                        CancelPendingCastRequest();
+                        return;
+                    }
+                }
+            }
+
+            // auto-selection buff level base at target level (in spellInfo)
+            if (targets.GetUnitTarget() != null)
+            {
+                SpellInfo actualSpellInfo = spellInfo.GetAuraRankForLevel(targets.GetUnitTarget().GetLevelForTarget(this));
+
+                // if rank not found then function return NULL but in explicit cast case original spell can be cast and later failed with appropriate error message
+                if (actualSpellInfo != null)
+                    spellInfo = actualSpellInfo;
+            }
+
+            Spell spell = new Spell(castingUnit, spellInfo, triggerFlag);
+
+            SpellPrepare spellPrepare = new();
+            spellPrepare.ClientCastID = _pendingSpellCastRequest.CastRequest.CastID;
+            spellPrepare.ServerCastID = spell.m_castId;
+            SendPacket(spellPrepare);
+
+            spell.m_fromClient = true;
+            spell.m_misc.Data0 = _pendingSpellCastRequest.CastRequest.Misc[0];
+            spell.m_misc.Data1 = _pendingSpellCastRequest.CastRequest.Misc[1];
+            spell.Prepare(targets);
+
+            _pendingSpellCastRequest = null;
+        }
+
+        bool ProcessItemCast(SpellCastRequest castRequest, SpellCastTargets targets)
+        {
+            Item item = GetUseableItemByPos(castRequest.ItemData.PackSlot, castRequest.ItemData.Slot);
+            if (item == null)
+            {
+                SendEquipError(InventoryResult.ItemNotFound);
+                return false;
+            }
+
+            if (item.GetGUID() != castRequest.ItemData.CastItem)
+            {
+                SendEquipError(InventoryResult.ItemNotFound);
+                return false;
+            }
+
+            ItemTemplate proto = item.GetTemplate();
+            if (proto == null)
+            {
+                SendEquipError(InventoryResult.ItemNotFound, item);
+                return false;
+            }
+
+            // some item classes can be used only in equipped state
+            if (proto.GetInventoryType() != InventoryType.NonEquip && !item.IsEquipped())
+            {
+                SendEquipError(InventoryResult.ItemNotFound, item);
+                return false;
+            }
+
+            InventoryResult msg = CanUseItem(item);
+            if (msg != InventoryResult.Ok)
+            {
+                SendEquipError(msg, item, null);
+                return false;
+            }
+
+            // only allow conjured consumable, bandage, poisons (all should have the 2^21 item flag set in DB)
+            if (proto.GetClass() == ItemClass.Consumable && !proto.HasFlag(ItemFlags.IgnoreDefaultArenaRestrictions) && InArena())
+            {
+                SendEquipError(InventoryResult.NotDuringArenaMatch, item);
+                return false;
+            }
+
+            // don't allow items banned in arena
+            if (proto.HasFlag(ItemFlags.NotUseableInArena) && InArena())
+            {
+                SendEquipError(InventoryResult.NotDuringArenaMatch, item);
+                return false;
+            }
+
+            if (IsInCombat())
+            {
+                foreach (var effect in item.GetEffects())
+                {
+                    SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo((uint)effect.SpellID, GetMap().GetDifficultyID());
+                    if (spellInfo != null)
+                    {
+                        if (!spellInfo.CanBeUsedInCombat(this))
+                        {
+                            SendEquipError(InventoryResult.NotInCombat, item);
+                            return false;
+                        }
+                    }
+                }
+            }
+
+            // check also  BIND_ON_ACQUIRE and BIND_QUEST for .additem or .additemset case by GM (not binded at adding to inventory)
+            if (item.GetBonding() == ItemBondingType.OnUse || item.GetBonding() == ItemBondingType.OnAcquire || item.GetBonding() == ItemBondingType.Quest)
+            {
+                if (!item.IsSoulBound())
+                {
+                    item.SetState(ItemUpdateState.Changed, this);
+                    item.SetBinding(true);
+                    GetSession().GetCollectionMgr().AddItemAppearance(item);
+                }
+            }
+
+            RemoveAurasWithInterruptFlags(SpellAuraInterruptFlags.ItemUse);
+
+            // Note: If script stop casting it must send appropriate data to client to prevent stuck item in gray state.
+            if (!Global.ScriptMgr.OnItemUse(this, item, targets, castRequest.CastRequest.CastID))
+            {
+                // no script or script not process request by self
+                CastItemUseSpell(item, targets, castRequest.CastRequest.CastID, castRequest.CastRequest.Misc);
+            }
+
+            return true;
+        }
+
+        bool CanExecutePendingSpellCastRequest()
+        {
+            if (_pendingSpellCastRequest == null)
+                return false;
+
+            Unit castingUnit = _pendingSpellCastRequest.CastingUnitGUID == GetGUID() ? this : Global.ObjAccessor.GetUnit(this, _pendingSpellCastRequest.CastingUnitGUID);
+            if (castingUnit == null || !castingUnit.IsInWorld || (castingUnit != this && GetUnitBeingMoved() != castingUnit))
+            {
+                // If the casting unit is no longer available, just cancel the entire spell cast request and be done with it
+                CancelPendingCastRequest();
+                return false;
+            }
+
+            // Generic and melee spells have to wait, channeled spells can be processed immediately.
+            if (castingUnit.GetCurrentSpell(CurrentSpellTypes.Channeled) == null && castingUnit.HasUnitState(UnitState.Casting))
+                return false;
+
+            // Waiting for the global cooldown to expire before attempting to execute the cast request
+            if (castingUnit.GetSpellHistory().GetRemainingGlobalCooldown(Global.SpellMgr.GetSpellInfo(_pendingSpellCastRequest.CastRequest.SpellID, GetMap().GetDifficultyID())) > TimeSpan.Zero)
+                return false;
+
+            return true;
+        }
     }
 
     public class PlayerSpell

Source/Game/Entities/Player/Player.cs

@@ -358,6 +358,10 @@ namespace Game.Entities
             base.Update(diff);
             SetCanDelayTeleport(false);
 
+            // Unit::Update updates the spell history and spell states. We can now check if we can launch another pending cast.
+            if (CanExecutePendingSpellCastRequest())
+                ExecutePendingSpellCastRequest();
+
             long now = GameTime.GetGameTime();
 
             UpdatePvPFlag(now);
@@ -642,6 +646,9 @@ namespace Game.Entities
                     return;
                 }
 
+                // clear all pending spell cast requests when dying
+                CancelPendingCastRequest();
+
                 // drunken state is cleared on death
                 SetDrunkValue(0);
 

Source/Game/Handlers/SpellHandler.cs

@@ -20,97 +20,22 @@ namespace Game
         [WorldPacketHandler(ClientOpcodes.UseItem, Processing = PacketProcessing.Inplace)]
         void HandleUseItem(UseItem packet)
         {
-            Player user = GetPlayer();
-
             // ignore for remote control state
-            if (user.GetUnitBeingMoved() != user)
+            if (_player.GetUnitBeingMoved() != _player)
                 return;
 
-            Item item = user.GetUseableItemByPos(packet.PackSlot, packet.Slot);
-            if (item == null)
+            // Skip casting invalid spells right away
+            SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo(packet.Cast.SpellID, _player.GetMap().GetDifficultyID());
+            if (spellInfo == null)
             {
-                user.SendEquipError(InventoryResult.ItemNotFound);
+                Log.outError(LogFilter.Network, $"WorldSession::HandleUseItemOpcode: attempted to cast a non-existing spell (Id: {packet.Cast.SpellID})");
                 return;
             }
 
-            if (item.GetGUID() != packet.CastItem)
-            {
-                user.SendEquipError(InventoryResult.ItemNotFound);
-                return;
-            }
-
-            ItemTemplate proto = item.GetTemplate();
-            if (proto == null)
-            {
-                user.SendEquipError(InventoryResult.ItemNotFound, item);
-                return;
-            }
-
-            // some item classes can be used only in equipped state
-            if (proto.GetInventoryType() != InventoryType.NonEquip && !item.IsEquipped())
-            {
-                user.SendEquipError(InventoryResult.ItemNotFound, item);
-                return;
-            }
-
-            InventoryResult msg = user.CanUseItem(item);
-            if (msg != InventoryResult.Ok)
-            {
-                user.SendEquipError(msg, item);
-                return;
-            }
-
-            // only allow conjured consumable, bandage, poisons (all should have the 2^21 item flag set in DB)
-            if (proto.GetClass() == ItemClass.Consumable && !proto.HasFlag(ItemFlags.IgnoreDefaultArenaRestrictions) && user.InArena())
-            {
-                user.SendEquipError(InventoryResult.NotDuringArenaMatch, item);
-                return;
-            }
-
-            // don't allow items banned in arena
-            if (proto.HasFlag(ItemFlags.NotUseableInArena) && user.InArena())
-            {
-                user.SendEquipError(InventoryResult.NotDuringArenaMatch, item);
-                return;
-            }
-
-            if (user.IsInCombat())
-            {
-                foreach (ItemEffectRecord effect in item.GetEffects())
-                {
-                    SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo((uint)effect.SpellID, user.GetMap().GetDifficultyID());
-                    if (spellInfo != null)
-                    {
-                        if (!spellInfo.CanBeUsedInCombat(user))
-                        {
-                            user.SendEquipError(InventoryResult.NotInCombat, item);
-                            return;
-                        }
-                    }
-                }
-            }
-
-            // check also  BIND_WHEN_PICKED_UP and BIND_QUEST_ITEM for .additem or .additemset case by GM (not binded at adding to inventory)
-            if (item.GetBonding() == ItemBondingType.OnUse || item.GetBonding() == ItemBondingType.OnAcquire || item.GetBonding() == ItemBondingType.Quest)
-            {
-                if (!item.IsSoulBound())
-                {
-                    item.SetState(ItemUpdateState.Changed, user);
-                    item.SetBinding(true);
-                    GetCollectionMgr().AddItemAppearance(item);
-                }
-            }
-
-            user.RemoveAurasWithInterruptFlags(SpellAuraInterruptFlags.ItemUse);
-
-            SpellCastTargets targets = new(user, packet.Cast);
-
-            // Note: If script stop casting it must send appropriate data to client to prevent stuck item in gray state.
-            if (!Global.ScriptMgr.OnItemUse(user, item, targets, packet.Cast.CastID))
-            {
-                // no script or script not process request by self
-                user.CastItemUseSpell(item, targets, packet.Cast.CastID, packet.Cast.Misc);
-            }
+            if (_player.CanRequestSpellCast(spellInfo, _player))
+                _player.RequestSpellCast(new SpellCastRequest(packet.Cast, _player.GetGUID(), new SpellCastRequestItemData(packet.PackSlot, packet.Slot, packet.CastItem)));
+            else
+                Spell.SendCastResult(_player, spellInfo, default, packet.Cast.CastID, SpellCastResult.SpellInProgress);
         }
 
         [WorldPacketHandler(ClientOpcodes.OpenItem, Processing = PacketProcessing.Inplace)]
@@ -279,108 +204,46 @@ namespace Game
         [WorldPacketHandler(ClientOpcodes.CastSpell, Processing = PacketProcessing.ThreadSafe)]
         void HandleCastSpell(CastSpell cast)
         {
-            // ignore for remote control state (for player case)
-            Unit mover = GetPlayer().GetUnitBeingMoved();
-            if (mover != GetPlayer() && mover.IsTypeId(TypeId.Player))
-                return;
-
-            SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo(cast.Cast.SpellID, mover.GetMap().GetDifficultyID());
+            SpellInfo spellInfo = Global.SpellMgr.GetSpellInfo(cast.Cast.SpellID, _player.GetMap().GetDifficultyID());
             if (spellInfo == null)
             {
-                Log.outError(LogFilter.Network, "WORLD: unknown spell id {0}", cast.Cast.SpellID);
+                Log.outError(LogFilter.Network, $"WorldSession::HandleCastSpellOpcode: attempted to cast a non-existing spell (Id: {cast.Cast.SpellID})");
                 return;
             }
 
-            Unit caster = mover;
-            if (caster.IsTypeId(TypeId.Unit) && !caster.ToCreature().HasSpell(spellInfo.Id))
+            // ignore for remote control state (for player case)
+            Unit mover = _player.GetUnitBeingMoved();
+            if (mover != _player && mover.IsPlayer())
+                return;
+
+            Unit castingUnit = mover;
+            if (castingUnit.IsCreature() && !castingUnit.ToCreature().HasSpell(spellInfo.Id))
             {
                 // If the vehicle creature does not have the spell but it allows the passenger to cast own spells
                 // change caster to player and let him cast
-                if (!GetPlayer().IsOnVehicle(caster) || spellInfo.CheckVehicle(GetPlayer()) != SpellCastResult.SpellCastOk)
+                if (!GetPlayer().IsOnVehicle(castingUnit) || spellInfo.CheckVehicle(GetPlayer()) != SpellCastResult.SpellCastOk)
                     return;
 
-                caster = GetPlayer();
-            }
-
-            TriggerCastFlags triggerFlag = TriggerCastFlags.None;
-
-            // client provided targets
-            SpellCastTargets targets = new(caster, cast.Cast);
-
-            // check known spell or raid marker spell (which not requires player to know it)
-            if (caster.IsTypeId(TypeId.Player) && !caster.ToPlayer().HasActiveSpell(spellInfo.Id) && !spellInfo.HasAttribute(SpellAttr8.SkipIsKnownCheck))
-            {
-                bool allow = false;
-
-                // allow casting of unknown spells for special lock cases
-                GameObject go = targets.GetGOTarget();
-                if (go != null)
-                    if (go.GetSpellForLock(caster.ToPlayer()) == spellInfo)
-                        allow = true;
-
-                // allow casting of spells triggered by clientside periodic trigger auras
-                if (caster.HasAuraTypeWithTriggerSpell(AuraType.PeriodicTriggerSpellFromClient, spellInfo.Id))
-                {
-                    allow = true;
-                    triggerFlag = TriggerCastFlags.FullMask;
-                }
-
-                if (!allow)
-                    return;
-            }
-
-            // Check possible spell cast overrides
-            spellInfo = caster.GetCastSpellInfo(spellInfo, triggerFlag);
-
-            if (spellInfo.IsPassive())
-                return;
-
-            // can't use our own spells when we're in possession of another unit,
-            if (GetPlayer().IsPossessing())
-                return;
-
-            // Client is resending autoshot cast opcode when other spell is cast during shoot rotation
-            // Skip it to prevent "interrupt" message
-            // Also check targets! target may have changed and we need to interrupt current spell
-            if (spellInfo.IsAutoRepeatRangedSpell())
-            {
-                Spell autoRepeatSpell = caster.GetCurrentSpell(CurrentSpellTypes.AutoRepeat);
-                if (autoRepeatSpell != null)
-                    if (autoRepeatSpell.m_spellInfo == spellInfo && autoRepeatSpell.m_targets.GetUnitTargetGUID() == targets.GetUnitTargetGUID())
-                        return;
-            }
-
-            // auto-selection buff level base at target level (in spellInfo)
-            if (targets.GetUnitTarget() != null)
-            {
-                SpellInfo actualSpellInfo = spellInfo.GetAuraRankForLevel(targets.GetUnitTarget().GetLevelForTarget(caster));
-
-                // if rank not found then function return NULL but in explicit cast case original spell can be casted and later failed with appropriate error message
-                if (actualSpellInfo != null)
-                    spellInfo = actualSpellInfo;
+                castingUnit = GetPlayer();
             }
 
             if (cast.Cast.MoveUpdate != null)
                 HandleMovementOpcode(ClientOpcodes.MoveStop, cast.Cast.MoveUpdate);
 
-            Spell spell = new(caster, spellInfo, triggerFlag);
-
-            SpellPrepare spellPrepare = new();
-            spellPrepare.ClientCastID = cast.Cast.CastID;
-            spellPrepare.ServerCastID = spell.m_castId;
-            SendPacket(spellPrepare);
-
-            spell.m_fromClient = true;
-            spell.m_misc.Data0 = cast.Cast.Misc[0];
-            spell.m_misc.Data1 = cast.Cast.Misc[1];
-            spell.Prepare(targets);
+            if (_player.CanRequestSpellCast(spellInfo, castingUnit))
+                _player.RequestSpellCast(new SpellCastRequest(cast.Cast, castingUnit.GetGUID()));
+            else
+                Spell.SendCastResult(_player, spellInfo, default, cast.Cast.CastID, SpellCastResult.SpellInProgress);
         }
 
         [WorldPacketHandler(ClientOpcodes.CancelCast, Processing = PacketProcessing.ThreadSafe)]
         void HandleCancelCast(CancelCast packet)
         {
-            if (GetPlayer().IsNonMeleeSpellCast(false))
-                GetPlayer().InterruptNonMeleeSpells(false, packet.SpellID, false);
+            if (_player.IsNonMeleeSpellCast(false))
+            {
+                _player.InterruptNonMeleeSpells(false, packet.SpellID, false);
+                _player.CancelPendingCastRequest(); // canceling casts also cancels pending spell cast requests
+            }
         }
 
         [WorldPacketHandler(ClientOpcodes.CancelAura, Processing = PacketProcessing.Inplace)]
@@ -486,6 +349,12 @@ namespace Game
             _player.InterruptSpell(CurrentSpellTypes.AutoRepeat);
         }
 
+        [WorldPacketHandler(ClientOpcodes.CancelChannelling, Processing = PacketProcessing.Inplace)]
+        void HandleCancelQueuedSpellOpcode(CancelQueuedSpell cancelQueuedSpell)
+        {
+            _player.CancelPendingCastRequest();
+        }
+
         [WorldPacketHandler(ClientOpcodes.CancelChannelling, Processing = PacketProcessing.Inplace)]
         void HandleCancelChanneling(CancelChannelling cancelChanneling)
         {

Source/Game/Networking/Packets/SpellPackets.cs

@@ -44,7 +44,7 @@ namespace Game.Networking.Packets
 
         public int ChannelSpell;
         public int Reason;       // 40 = /run SpellStopCasting(), 16 = movement/AURA_INTERRUPT_FLAG_MOVE, 41 = turning/AURA_INTERRUPT_FLAG_TURNING
-                                // does not match SpellCastResult enum
+                                 // does not match SpellCastResult enum
     }
 
     class CancelGrowthAura : ClientPacket
@@ -181,11 +181,11 @@ namespace Game.Networking.Packets
 
     public class CastSpell : ClientPacket
     {
-        public SpellCastRequest Cast;
+        public SpellCastRequestPkt Cast;
 
         public CastSpell(WorldPacket packet) : base(packet)
         {
-            Cast = new SpellCastRequest();
+            Cast = new SpellCastRequestPkt();
         }
 
         public override void Read()
@@ -197,11 +197,11 @@ namespace Game.Networking.Packets
     public class PetCastSpell : ClientPacket
     {
         public ObjectGuid PetGUID;
-        public SpellCastRequest Cast;
+        public SpellCastRequestPkt Cast;
 
         public PetCastSpell(WorldPacket packet) : base(packet)
         {
-            Cast = new SpellCastRequest();
+            Cast = new SpellCastRequestPkt();
         }
 
         public override void Read()
@@ -216,11 +216,11 @@ namespace Game.Networking.Packets
         public byte PackSlot;
         public byte Slot;
         public ObjectGuid CastItem;
-        public SpellCastRequest Cast;
+        public SpellCastRequestPkt Cast;
 
         public UseItem(WorldPacket packet) : base(packet)
         {
-            Cast = new SpellCastRequest();
+            Cast = new SpellCastRequestPkt();
         }
 
         public override void Read()
@@ -363,8 +363,8 @@ namespace Game.Networking.Packets
         public int SpellID;
         public SpellCastResult Reason;
         public int FailedArg1 = -1;
-        public int FailedArg2 = -1; 
-        
+        public int FailedArg2 = -1;
+
         public CastFailedBase(ServerOpcodes opcode, ConnectionType connectionType) : base(opcode, connectionType) { }
 
         public override void Write()
@@ -760,7 +760,7 @@ namespace Game.Networking.Packets
             _worldPacket.WriteInt32(Delay);
         }
     }
-    
+
     public class CancelCast : ClientPacket
     {
         public CancelCast(WorldPacket packet) : base(packet) { }
@@ -1161,7 +1161,14 @@ namespace Game.Networking.Packets
 
         public ushort OverrideID;
     }
-    
+
+    class CancelQueuedSpell : ClientPacket
+    {
+        public CancelQueuedSpell(WorldPacket packet) : base(packet) { }
+
+        public override void Read() { }
+    }
+
     //Structs
     public struct SpellLogPowerData
     {
@@ -1326,14 +1333,14 @@ namespace Game.Networking.Packets
         }
 
         public void Write(WorldPacket data)
-        {   
+        {
             data.WriteFloat(PlayerItemLevel);
             data.WriteFloat(TargetItemLevel);
             data.WriteInt16(PlayerLevelDelta);
             data.WriteUInt32(ScalingHealthItemLevelCurveID);
             data.WriteUInt8(TargetLevel);
             data.WriteUInt8(Expansion);
-            data.WriteInt8(TargetScalingLevelDelta); 
+            data.WriteInt8(TargetScalingLevelDelta);
             data.WriteUInt32((uint)Flags);
             data.WriteUInt32(PlayerContentTuningID);
             data.WriteUInt32(TargetContentTuningID);
@@ -1356,7 +1363,7 @@ namespace Game.Networking.Packets
         public int Unused927;
 
         public enum ContentTuningType
-        {        
+        {
             CreatureToPlayerDamage = 1,
             PlayerToCreatureDamage = 2,
             CreatureToCreatureDamage = 4,
@@ -1505,7 +1512,7 @@ namespace Game.Networking.Packets
     {
         public void Write(WorldPacket data)
         {
-            data .WriteUInt8(Slot);
+            data.WriteUInt8(Slot);
             data.WriteBit(AuraData != null);
             data.FlushBits();
 
@@ -1661,8 +1668,8 @@ namespace Game.Networking.Packets
         }
     }
 
-    public class SpellCastRequest
-    {   
+    public class SpellCastRequestPkt
+    {
         public ObjectGuid CastID;
         public uint SpellID;
         public SpellCastVisual Visual;
@@ -1852,7 +1859,7 @@ namespace Game.Networking.Packets
 
             Immunities.Write(data);
             Predict.Write(data);
- 
+
             data.WriteBits(HitTargets.Count, 16);
             data.WriteBits(MissTargets.Count, 16);
             data.WriteBits(HitStatus.Count, 16);
@@ -2000,7 +2007,7 @@ namespace Game.Networking.Packets
             data.FlushBits();
 
             if (unused622_1.HasValue)
-                data .WriteUInt32(unused622_1.Value);
+                data.WriteUInt32(unused622_1.Value);
             if (unused622_2.HasValue)
                 data.WriteUInt32(unused622_2.Value);
         }

Source/Game/Networking/Packets/ToyPackets.cs

@@ -29,7 +29,7 @@ namespace Game.Networking.Packets
             Cast.Read(_worldPacket);
         }
 
-        public SpellCastRequest Cast = new();
+        public SpellCastRequestPkt Cast = new();
     }
 
     class AccountToyUpdate : ServerPacket

Source/Game/Spells/Spell.cs

@@ -8121,6 +8121,8 @@ namespace Game.Spells
             return m_casttime;
         }
 
+        public int GetRemainingCastTime() { return m_timer; }
+
         bool IsAutoRepeat()
         {
             return m_autoRepeat;

Source/Game/Spells/SpellCastRequest.cs

@@ -0,0 +1,37 @@
+// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
+// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
+
+using Game.Entities;
+using Game.Networking.Packets;
+
+namespace Game.Spells
+{
+    public class SpellCastRequestItemData
+    {
+        public byte PackSlot;
+        public byte Slot;
+        public ObjectGuid CastItem;
+
+        public SpellCastRequestItemData(byte packSlot, byte slot, ObjectGuid castItem)
+        {
+            PackSlot = packSlot;
+            Slot = slot;
+            CastItem = castItem;
+        }
+    }
+
+    public class SpellCastRequest
+    {
+        public SpellCastRequestPkt CastRequest;
+        public ObjectGuid CastingUnitGUID;
+        public SpellCastRequestItemData ItemData;
+
+        public SpellCastRequest(SpellCastRequestPkt castRequest, ObjectGuid castingUnitGUID, SpellCastRequestItemData? itemData = null)
+        {
+            CastRequest = castRequest;
+            CastingUnitGUID = castingUnitGUID;
+            ItemData = itemData;
+        }
+    }
+
+}

Source/Game/Spells/SpellCastTargets.cs

@@ -18,7 +18,7 @@ namespace Game.Spells
             m_dst = new SpellDestination();
         }
 
-        public SpellCastTargets(Unit caster, SpellCastRequest spellCastRequest)
+        public SpellCastTargets(Unit caster, SpellCastRequestPkt spellCastRequest)
         {
             m_targetMask = spellCastRequest.Target.Flags;
             m_objectTargetGUID = spellCastRequest.Target.Unit;

Source/Game/Spells/SpellHistory.cs

@@ -537,7 +537,7 @@ namespace Game.Spells
             }
 
             if (cooldownEntry.CooldownEnd <= now)
-            {                
+            {
                 _categoryCooldowns.Remove(cooldownEntry.CategoryId);
                 _spellCooldowns.Remove(cooldownEntry.SpellId);
             }
@@ -697,7 +697,7 @@ namespace Game.Spells
         {
             return GetRemainingCategoryCooldown(spellInfo.GetCategory());
         }
-        
+
         public void LockSpellSchool(SpellSchoolMask schoolMask, TimeSpan lockoutTime)
         {
             DateTime now = GameTime.GetSystemTime();
@@ -921,6 +921,18 @@ namespace Game.Spells
             _globalCooldowns[spellInfo.StartRecoveryCategory] = new DateTime();
         }
 
+        public TimeSpan GetRemainingGlobalCooldown(SpellInfo spellInfo)
+        {
+            if (!_globalCooldowns.TryGetValue(spellInfo.StartRecoveryCategory, out DateTime end))
+                return TimeSpan.Zero;
+
+            DateTime now = GameTime.GetDateAndTime();
+            if (end < now)
+                return TimeSpan.Zero;
+
+            return end - now;
+        }
+
         public Player GetPlayerOwner()
         {
             return _owner.GetCharmerOrOwnerPlayerOrPlayerItself();
@@ -952,7 +964,7 @@ namespace Game.Spells
                 player.SendPacket(setSpellCharges);
             }
         }
-        
+
         void GetCooldownDurations(SpellInfo spellInfo, uint itemId, ref uint categoryId)
         {
             TimeSpan notUsed = TimeSpan.Zero;