Core/Auras: implemented PROC_FLAG_HEARTBEAT and moved food/drink emote mechanic into heartbeat handling

Port From (https://github.com/TrinityCore/TrinityCore/commit/d60b4e5b199d56477010941fc1d3aff9eb7064a2)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -2538,7 +2538,7 @@ namespace Framework.Constants
     {
         None = 0x0,
 
-        Heartbeat = 0x01,    // 00 Killed by agressor - not sure about this flag
+        Heartbeat = 0x01,    // 00 Heartbeat
         Kill = 0x02,    // 01 Kill target (in most cases need XP/Honor reward)
 
         DealMeleeSwing = 0x04,    // 02 Done melee auto attack

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

@@ -148,7 +148,6 @@ namespace Game.Entities
         AttackSwingErr? m_swingErrorMsg;
         DateTime m_regenInterruptTimestamp;
         uint m_regenTimerCount;
-        uint m_foodEmoteTimerCount;
         uint m_weaponChangeTimer;
 
         //Quest

Source/Game/Entities/Player/Player.cs

@@ -3484,7 +3484,6 @@ namespace Game.Entities
         void RegenerateAll()
         {
             m_regenTimerCount += RegenTimer;
-            m_foodEmoteTimerCount += RegenTimer;
 
             for (PowerType power = PowerType.Mana; power < PowerType.Max; power++)// = power + 1)
                 if (power != PowerType.Runes)
@@ -3521,33 +3520,8 @@ namespace Game.Entities
             }
 
             RegenTimer = 0;
-
-            // Handles the emotes for drinking and eating.
-            // According to sniffs there is a background timer going on that repeats independed from the time window where the aura applies.
-            // That's why we dont need to reset the timer on apply. In sniffs I have seen that the first call for the spell visual is totally random, then after
-            // 5 seconds over and over again which confirms my theory that we have a independed timer.
-            if (m_foodEmoteTimerCount >= 5000)
-            {
-                List<AuraEffect> auraList = GetAuraEffectsByType(AuraType.ModRegen);
-                auraList.AddRange(GetAuraEffectsByType(AuraType.ModPowerRegen));
-
-                foreach (var auraEffect in auraList)
-                {
-                    // Food emote comes above drinking emote if we have to decide (mage regen food for example)
-                    if (auraEffect.GetBase().HasEffectType(AuraType.ModRegen) && auraEffect.GetSpellInfo().HasAuraInterruptFlag(SpellAuraInterruptFlags.Standing))
-                    {
-                        SendPlaySpellVisualKit(SpellConst.VisualKitFood, 0, 0);
-                        break;
-                    }
-                    else if (auraEffect.GetBase().HasEffectType(AuraType.ModPowerRegen) && auraEffect.GetSpellInfo().HasAuraInterruptFlag(SpellAuraInterruptFlags.Standing))
-                    {
-                        SendPlaySpellVisualKit(SpellConst.VisualKitDrink, 0, 0);
-                        break;
-                    }
-                }
-                m_foodEmoteTimerCount -= 5000;
-            }
         }
+
         void Regenerate(PowerType power)
         {
             // Skip regeneration for power type we cannot have

Source/Game/Entities/Unit/Unit.cs

@@ -2561,6 +2561,17 @@ namespace Game.Entities
 
             // SMSG_FLIGHT_SPLINE_SYNC for cyclic splines
             SendFlightSplineSyncUpdate();
+
+            // Trigger heartbeat procs and generic aura behavior such as food emotes
+            TriggerAuraHeartbeat();
+        }
+
+        void TriggerAuraHeartbeat()
+        {
+            foreach (var (_, auraApplication) in m_appliedAuras)
+                auraApplication.GetBase().Heartbeat();
+
+            Unit.ProcSkillsAndAuras(this, null, new ProcFlagsInit(ProcFlags.Heartbeat), new ProcFlagsInit(ProcFlags.None), ProcFlagsSpellType.MaskAll, ProcFlagsSpellPhase.None, ProcFlagsHit.None, null, null, null);
         }
 
         public bool HaveOffhandWeapon()

Source/Game/Spells/Auras/Aura.cs

@@ -364,6 +364,8 @@ namespace Game.Spells
             // m_casterLevel = cast item level/caster level, caster level should be saved to db, confirmed with sniffs
         }
 
+        public virtual void Heartbeat() { }
+
         public T GetScript<T>() where T : AuraScript
         {
             return (T)GetScriptByType(typeof(T));
@@ -2863,6 +2865,28 @@ namespace Game.Spells
             _staticApplications[target.GetGUID()] |= effMask;
         }
 
+        void Heartbeat()
+        {
+            base.Heartbeat();
+
+            // Periodic food and drink emote animation
+            HandlePeriodicFoodSpellVisualKit();
+        }
+
+        void HandlePeriodicFoodSpellVisualKit()
+        {
+            SpellSpecificType specificType = GetSpellInfo().GetSpellSpecific();
+
+            bool food = specificType == SpellSpecificType.Food || specificType == SpellSpecificType.FoodAndDrink;
+            bool drink = specificType == SpellSpecificType.Drink || specificType == SpellSpecificType.FoodAndDrink;
+
+            if (food)
+                GetUnitOwner().SendPlaySpellVisualKit(SpellConst.VisualKitFood, 0, 0);
+
+            if (drink)
+                GetUnitOwner().SendPlaySpellVisualKit(SpellConst.VisualKitDrink, 0, 0);
+        }
+
         // Allow Apply Aura Handler to modify and access m_AuraDRGroup
         public void SetDiminishGroup(DiminishingGroup group) { m_AuraDRGroup = group; }
         public DiminishingGroup GetDiminishGroup() { return m_AuraDRGroup; }