Core/Spells: Fix SPELL_AURA_MOD_POWER_COST_SCHOOL and SPELL_AURA_MOD_POWER_COST_SCHOOL_PCT

(cherry picked from commit be07a7d)

Author: Shocker

src/server/game/Spells/SpellInfo.cpp

@@ -3281,8 +3281,15 @@ int32 SpellInfo::CalcPowerCost(WorldObject const* caster, SpellSchoolMask school
     }
     SpellSchools school = GetFirstSchoolInMask(schoolMask);
     // Flat mod from caster auras by spell school
-    powerCost += unitCaster->GetInt32Value(UNIT_FIELD_POWER_COST_MODIFIER + AsUnderlyingType(school));
-
+    AuraEffectList const& auras = unitCaster->GetAuraEffectsByType(SPELL_AURA_MOD_POWER_COST_SCHOOL);
+    for (AuraEffectList::const_iterator i = auras.begin(); i != auras.end(); ++i)
+    {
+        if (!((*i)->GetMiscValue() & schoolMask))
+            continue;
+        if (!((*i)->GetMiscValueB() & (1 << PowerType)))
+            continue;
+        powerCost += (*i)->GetAmount();
+    }
     // Shiv - costs 20 + weaponSpeed*10 energy (apply only to non-triggered spell with energy cost)
     if (HasAttribute(SPELL_ATTR4_SPELL_VS_EXTEND_COST))
     {
@@ -3311,7 +3318,15 @@ int32 SpellInfo::CalcPowerCost(WorldObject const* caster, SpellSchoolMask school
     }
 
     // PCT mod from user auras by school
-    powerCost = int32(powerCost * (1.0f + unitCaster->GetFloatValue(UNIT_FIELD_POWER_COST_MULTIPLIER + AsUnderlyingType(school))));
+    AuraEffectList const& aurasPct = unitCaster->GetAuraEffectsByType(SPELL_AURA_MOD_POWER_COST_SCHOOL_PCT);
+    for (AuraEffectList::const_iterator i = aurasPct.begin(); i != aurasPct.end(); ++i)
+    {
+        if (!((*i)->GetMiscValue() & schoolMask))
+            continue;
+        if (!((*i)->GetMiscValueB() & (1 << PowerType)))
+            continue;
+        powerCost += CalculatePct(powerCost, (*i)->GetAmount());
+    }
     if (powerCost < 0)
         powerCost = 0;
     return powerCost;