From 902b217d885b5def817a62cf469b56d8eb547706 Mon Sep 17 00:00:00 2001
From: hondacrx <prelude_20032002@yahoo.com>
Date: Tue, 30 Jan 2024 09:39:40 -0500
Subject: [PATCH] Core/Auras: Implement
 SPELL_ATTR13_PERIODIC_REFRESH_EXTENDS_DURATION

Port From (https://github.com/TrinityCore/TrinityCore/commit/e1f345756ba34ccf4d4dd07b90c254097a240b51)
---
 Source/Game/Spells/Auras/Aura.cs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Source/Game/Spells/Auras/Aura.cs b/Source/Game/Spells/Auras/Aura.cs
index 1ec98040f..d7b1aca8e 100644
--- a/Source/Game/Spells/Auras/Aura.cs
+++ b/Source/Game/Spells/Auras/Aura.cs
@@ -817,7 +817,18 @@ namespace Game.Spells
         {
             m_maxDuration = CalcMaxDuration();
 
+            // Pandemic Mechanic
+            if (m_spellInfo.HasAttribute(SpellAttr13.PeriodicRefreshExtendsDuration))
+            {
+                // Pandemic doesn't reset periodic timer
+                resetPeriodicTimer = false;
+
+                int pandemicDuration = MathFunctions.CalculatePct(m_maxDuration, 30.0f);
+                m_maxDuration = Math.Max(GetDuration(), Math.Min(pandemicDuration, GetDuration()) + m_maxDuration);
+            }
+
             RefreshDuration();
+
             Unit caster = GetCaster();
             for (byte i = 0; i < SpellConst.MaxEffects; ++i)
             {