feat(Core/Unit): Combat pulse (#14792)

Co-authored-by: Treeston <treeston@users.noreply.github.com>

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -572,6 +572,7 @@ void BossAI::_Reset()
     if (!me->IsAlive())
         return;
 
+    me->SetCombatPulseDelay(0);
     me->ResetLootMode();
     events.Reset();
     scheduler.CancelAll();
@@ -594,6 +595,7 @@ void BossAI::_JustDied()
 
 void BossAI::_EnterCombat()
 {
+    me->SetCombatPulseDelay(5);
     me->setActive(true);
     DoZoneInCombat();
     ScheduleTasks();

src/server/game/Entities/Creature/Creature.cpp

@@ -217,7 +217,7 @@ bool TemporaryThreatModifierEvent::Execute(uint64 /*e_time*/, uint32 /*p_time*/)
 
 Creature::Creature(bool isWorldObject): Unit(isWorldObject), MovableMapObject(), m_groupLootTimer(0), lootingGroupLowGUID(0), m_lootRecipientGroup(0),
     m_corpseRemoveTime(0), m_respawnTime(0), m_respawnDelay(300), m_corpseDelay(60), m_wanderDistance(0.0f), m_boundaryCheckTime(2500),
-    m_transportCheckTimer(1000), lootPickPocketRestoreTime(0),  m_reactState(REACT_AGGRESSIVE), m_defaultMovementType(IDLE_MOTION_TYPE),
+    m_transportCheckTimer(1000), lootPickPocketRestoreTime(0), m_combatPulseTime(0), m_combatPulseDelay(0), m_reactState(REACT_AGGRESSIVE), m_defaultMovementType(IDLE_MOTION_TYPE),
     m_spawnId(0), m_equipmentId(0), m_originalEquipmentId(0), m_AlreadyCallAssistance(false),
     m_AlreadySearchedAssistance(false), m_regenHealth(true), m_regenPower(true), m_AI_locked(false), m_meleeDamageSchoolMask(SPELL_SCHOOL_MASK_NORMAL), m_originalEntry(0), m_moveInLineOfSightDisabled(false), m_moveInLineOfSightStrictlyDisabled(false),
     m_homePosition(), m_transportHomePosition(), m_creatureInfo(nullptr), m_creatureData(nullptr), m_detectionDistance(20.0f), m_waypointID(0), m_path_id(0), m_formation(nullptr), _lastDamagedTime(nullptr), m_cannotReachTimer(0),
@@ -718,6 +718,24 @@ void Creature::Update(uint32 diff)
                 SelectVictim();
             }
 
+            // if periodic combat pulse is enabled and we are both in combat and in a dungeon, do this now
+            if (m_combatPulseDelay > 0 && IsInCombat() && GetMap()->IsDungeon())
+            {
+                if (diff > m_combatPulseTime)
+                    m_combatPulseTime = 0;
+                else
+                    m_combatPulseTime -= diff;
+
+                if (m_combatPulseTime == 0)
+                {
+                    if (AI())
+                        AI()->DoZoneInCombat();
+                    else
+                        SetInCombatWithZone();
+                    m_combatPulseTime = m_combatPulseDelay * IN_MILLISECONDS;
+                }
+            }
+
             // periodic check to see if the creature has passed an evade boundary
             if (IsAIEnabled && !IsInEvadeMode() && IsEngaged())
             {

src/server/game/Entities/Creature/Creature.h

@@ -283,6 +283,14 @@ public:
     [[nodiscard]] uint32 GetRespawnDelay() const { return m_respawnDelay; }
     void SetRespawnDelay(uint32 delay) { m_respawnDelay = delay; }
 
+    uint32 GetCombatPulseDelay() const { return m_combatPulseDelay; }
+    void SetCombatPulseDelay(uint32 delay) // (secs) interval at which the creature pulses the entire zone into combat (only works in dungeons)
+    {
+        m_combatPulseDelay = delay;
+        if (m_combatPulseTime == 0 || m_combatPulseTime > delay)
+            m_combatPulseTime = delay;
+    }
+
     [[nodiscard]] float GetWanderDistance() const { return m_wanderDistance; }
     void SetWanderDistance(float dist) { m_wanderDistance = dist; }
 
@@ -408,6 +416,8 @@ protected:
     uint32 m_boundaryCheckTime;                         // (msecs) remaining time for next evade boundary check
     uint16 m_transportCheckTimer;
     uint32 lootPickPocketRestoreTime;
+    uint32 m_combatPulseTime;                           // (msecs) remaining time for next zone-in-combat pulse
+    uint32 m_combatPulseDelay;
 
     ReactStates m_reactState;                           // for AI, not charmInfo
     void RegenerateHealth();