feat(Core/Scripting): Implement ScheduleEnrageTimer() helper (#21597)

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

@@ -633,6 +633,7 @@ void BossAI::_Reset()
     me->ResetLootMode();
     events.Reset();
     scheduler.CancelAll();
+    me->m_Events.KillAllEvents(false);
     summons.DespawnAll();
     ClearUniqueTimedEventsDone();
     _healthCheckEvents.clear();
@@ -787,6 +788,20 @@ void BossAI::ScheduleHealthCheckEvent(std::initializer_list<uint8> healthPct, st
     _nextHealthCheck = _healthCheckEvents.front();
 }
 
+void BossAI::ScheduleEnrageTimer(uint32 spellId, Milliseconds timer, uint8 textId /*= 0*/)
+{
+    me->m_Events.AddEventAtOffset([this, spellId, textId]
+    {
+        if (!me->IsAlive())
+            return;
+
+        if (textId)
+            Talk(textId);
+
+        DoCastSelf(spellId, true);
+    }, timer);
+}
+
 // WorldBossAI - for non-instanced bosses
 
 WorldBossAI::WorldBossAI(Creature* creature) :

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

@@ -485,6 +485,12 @@ public:
     void ScheduleHealthCheckEvent(uint32 healthPct, std::function<void()> exec);
     void ScheduleHealthCheckEvent(std::initializer_list<uint8> healthPct, std::function<void()> exec);
 
+    // @brief Casts the spell after the fixed time and says the text id if provided. Timer will run even if the creature is casting or out of combat.
+    // @param spellId The spell to cast.
+    // @param timer The time to wait before casting the spell.
+    // @param textId The text id to say.
+    void ScheduleEnrageTimer(uint32 spellId, Milliseconds timer, uint8 textId = 0);
+
     // Hook used to execute events scheduled into EventMap without the need
     // to override UpdateAI
     // note: You must re-schedule the event within this method if the event