Core/Spells: Implement sqrt based aoe damage diminishing (#29192)

Co-authored-by: Shauren <shauren.trinity@gmail.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/server/game/Spells/SpellInfo.cpp b/src/server/game/Spells/SpellInfo.cpp
index f43fbf07847..7020e63b246 100644
--- a/src/server/game/Spells/SpellInfo.cpp
+++ b/src/server/game/Spells/SpellInfo.cpp
@@ -3568,6 +3568,41 @@ void SpellInfo::_LoadImmunityInfo()
     }
 }
 
+void SpellInfo::_LoadSqrtTargetLimit(int32 maxTargets, int32 numNonDiminishedTargets, Optional<SpellEffIndex> maxTargetsEffectValueHolder,
+    Optional<SpellEffIndex> numNonDiminishedTargetsEffectValueHolder)
+{
+    SqrtDamageAndHealingDiminishing.MaxTargets = maxTargets;
+    SqrtDamageAndHealingDiminishing.NumNonDiminishedTargets = numNonDiminishedTargets;
+
+    if (maxTargetsEffectValueHolder)
+    {
+        if (maxTargetsEffectValueHolder < GetEffects().size())
+        {
+            SpellEffectInfo const& valueHolder = GetEffect(*maxTargetsEffectValueHolder);
+            int32 expectedValue = valueHolder.CalcBaseValue(nullptr, nullptr, 0, -1);
+            if (maxTargets != expectedValue)
+                TC_LOG_ERROR("spells", "SpellInfo::_LoadSqrtTargetLimit(maxTargets): Spell {} has different value in effect {} than expected, recheck target caps (expected {}, got {})",
+                    Id, AsUnderlyingType(*maxTargetsEffectValueHolder), maxTargets, expectedValue);
+        }
+        else
+            TC_LOG_ERROR("spells", "SpellInfo::_LoadSqrtTargetLimit(maxTargets): Spell {} does not have effect {}", Id, AsUnderlyingType(*maxTargetsEffectValueHolder));
+    }
+
+    if (numNonDiminishedTargetsEffectValueHolder)
+    {
+        if (numNonDiminishedTargetsEffectValueHolder < GetEffects().size())
+        {
+            SpellEffectInfo const& valueHolder = GetEffect(*numNonDiminishedTargetsEffectValueHolder);
+            int32 expectedValue = valueHolder.CalcBaseValue(nullptr, nullptr, 0, -1);
+            if (numNonDiminishedTargets != expectedValue)
+                TC_LOG_ERROR("spells", "SpellInfo::_LoadSqrtTargetLimit(numNonDiminishedTargets): Spell {} has different value in effect {} than expected, recheck target caps (expected {}, got {})",
+                    Id, AsUnderlyingType(*numNonDiminishedTargetsEffectValueHolder), numNonDiminishedTargets, expectedValue);
+        }
+        else
+            TC_LOG_ERROR("spells", "SpellInfo::_LoadSqrtTargetLimit(numNonDiminishedTargets): Spell {} does not have effect {}", Id, AsUnderlyingType(*numNonDiminishedTargetsEffectValueHolder));
+    }
+}
+
 void SpellInfo::ApplyAllSpellImmunitiesTo(Unit* target, SpellEffectInfo const& spellEffectInfo, bool apply) const
 {
     SpellEffectInfo::ImmunityInfo const* immuneInfo = spellEffectInfo.GetImmunityInfo();