Core/Spells: Fixed spell duration scaling with combo points

Port From (https://github.com/TrinityCore/TrinityCore/commit/9e68fd1458551ab0f007b6044c9220da8f7d4199)

Source/Game/BattleGrounds/Zones/ArathiBasin.cs

@@ -14,7 +14,6 @@ namespace Game.BattleGrounds.Zones
         public BgArathiBasin(BattlegroundTemplate battlegroundTemplate) : base(battlegroundTemplate)
         {
             m_IsInformedNearVictory = false;
-            m_BuffChange = true;
             BgObjects = new ObjectGuid[ABObjectTypes.Max];
             BgCreatures = new ObjectGuid[ABBattlegroundNodes.AllCount + 5];//+5 for aura triggers
 

Source/Game/BattleGrounds/Zones/EyeofStorm.cs

@@ -27,7 +27,6 @@ namespace Game.BattleGrounds.Zones
     {
         public BgEyeofStorm(BattlegroundTemplate battlegroundTemplate) : base(battlegroundTemplate)
         {
-            m_BuffChange = true;
             BgObjects = new ObjectGuid[EotSObjectTypes.Max];
             BgCreatures= new ObjectGuid[EotSCreaturesTypes.Max];
             m_Points_Trigger[EotSPoints.FelReaver] = EotSPointsTrigger.FelReaverBuff;

Source/Game/Entities/Object/WorldObject.cs

@@ -15,6 +15,7 @@ using Game.Scenarios;
 using Game.Spells;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Numerics;
 
 namespace Game.Entities
@@ -1874,27 +1875,39 @@ namespace Game.Entities
             return value;
         }
 
-        public int CalcSpellDuration(SpellInfo spellInfo)
+        public int CalcSpellDuration(SpellInfo spellInfo, List<SpellPowerCost> powerCosts)
         {
-            int comboPoints = 0;
-            int maxComboPoints = 5;
-            Unit unit = ToUnit();
-            if (unit != null)
-            {
-                comboPoints = unit.GetPower(PowerType.ComboPoints);
-                maxComboPoints = unit.GetMaxPower(PowerType.ComboPoints);
-            }
-
             int minduration = spellInfo.GetDuration();
+            if (minduration <= 0)
+                return minduration;
+
             int maxduration = spellInfo.GetMaxDuration();
+            if (minduration == maxduration)
+                return minduration;
 
-            int duration;
-            if (comboPoints != 0 && minduration != -1 && minduration != maxduration)
-                duration = minduration + ((maxduration - minduration) * comboPoints / maxComboPoints);
-            else
-                duration = minduration;
+            Unit unit = ToUnit();
+            if (unit == null)
+                return minduration;
 
-            return duration;
+            if (powerCosts == null)
+                return minduration;
+
+            // we want only baseline cost here
+            var powerCostRecord = spellInfo.PowerCosts.FirstOrDefault(powerEntry => powerEntry != null && powerEntry.PowerType == PowerType.ComboPoints && (powerEntry.RequiredAuraSpellID == 0 || unit.HasAura(powerEntry.RequiredAuraSpellID)));
+            if (powerCostRecord == null)
+                return minduration;
+
+            var consumedCost = powerCosts.Find(consumed => consumed.Power == PowerType.ComboPoints);
+            if (consumedCost == null)
+                return minduration;
+
+            int baseComboCost = powerCostRecord.ManaCost + (int)powerCostRecord.OptionalCost;
+            var powerTypeEntry = Global.DB2Mgr.GetPowerTypeEntry(PowerType.ComboPoints);
+            if (powerTypeEntry != null)
+                baseComboCost += MathFunctions.CalculatePct(powerTypeEntry.MaxBasePower, powerCostRecord.PowerCostPct + powerCostRecord.OptionalCostPct);
+
+            float durationPerComboPoint = (float)(maxduration - minduration) / baseComboCost;
+            return minduration + (int)(durationPerComboPoint * consumedCost.Amount);
         }
 
         public int ModSpellDuration(SpellInfo spellInfo, WorldObject target, int duration, bool positive, uint effectMask)

Source/Game/Spells/Auras/Aura.cs

@@ -742,10 +742,10 @@ namespace Game.Spells
 
         public int CalcMaxDuration(Unit caster)
         {
-            return CalcMaxDuration(GetSpellInfo(), caster);
+            return CalcMaxDuration(GetSpellInfo(), caster, null);
         }
 
-        public static int CalcMaxDuration(SpellInfo spellInfo, WorldObject caster)
+        public static int CalcMaxDuration(SpellInfo spellInfo, WorldObject caster, List<SpellPowerCost> powerCosts)
         {
             Player modOwner = null;
             int maxDuration;
@@ -753,7 +753,7 @@ namespace Game.Spells
             if (caster != null)
             {
                 modOwner = caster.GetSpellModOwner();
-                maxDuration = caster.CalcSpellDuration(spellInfo);
+                maxDuration = caster.CalcSpellDuration(spellInfo, powerCosts);
             }
             else
                 maxDuration = spellInfo.GetDuration();

Source/Game/Spells/Auras/AuraEffect.cs

@@ -152,7 +152,7 @@ namespace Game.Spells
 
         public static float CalculateEstimatedfTotalPeriodicAmount(Unit caster, Unit target, SpellInfo spellInfo, SpellEffectInfo spellEffectInfo, float amount, byte stack)
         {
-            int maxDuration = Aura.CalcMaxDuration(spellInfo, caster);
+            int maxDuration = Aura.CalcMaxDuration(spellInfo, caster, null);
             if (maxDuration <= 0)
                 return 0.0f;
 

Source/Game/Spells/Spell.cs

@@ -2239,7 +2239,7 @@ namespace Game.Spells
                     }
                 }
 
-                hitInfo.AuraDuration = Aura.CalcMaxDuration(m_spellInfo, origCaster);
+                hitInfo.AuraDuration = Aura.CalcMaxDuration(m_spellInfo, origCaster, m_powerCost);
 
                 // unit is immune to aura if it was diminished to 0 duration
                 if (!hitInfo.Positive && !unit.ApplyDiminishingToDuration(m_spellInfo, ref hitInfo.AuraDuration, origCaster, diminishLevel))

Source/Game/Spells/SpellInfo.cs

@@ -2792,25 +2792,19 @@ namespace Game.Spells
             if (power.RequiredAuraSpellID != 0 && !unitCaster.HasAura(power.RequiredAuraSpellID))
                 return null;
 
-            SpellPowerCost cost = new();
-
             // Spell drain all exist power on cast (Only paladin lay of Hands)
             if (HasAttribute(SpellAttr1.UseAllMana))
             {
+                if (optionalCost)
+                    return null;
+
                 // If power type - health drain all
                 if (power.PowerType == PowerType.Health)
-                {
-                    cost.Power = PowerType.Health;
-                    cost.Amount = (int)unitCaster.GetHealth();
-                    return cost;
-                }
+                    return new SpellPowerCost() { Power = PowerType.Health, Amount = (int)unitCaster.GetHealth() };
+
                 // Else drain all power
                 if (power.PowerType < PowerType.Max)
-                {
-                    cost.Power = power.PowerType;
-                    cost.Amount = unitCaster.GetPower(cost.Power);
-                    return cost;
-                }
+                    return new SpellPowerCost() { Power = power.PowerType, Amount = unitCaster.GetPower(power.PowerType) };
 
                 Log.outError(LogFilter.Spells, $"SpellInfo.CalcPowerCost: Unknown power type '{power.PowerType}' in spell {Id}");
                 return default;
@@ -2997,9 +2991,7 @@ namespace Game.Spells
             if (initiallyNegative != (powerCost < 0))
                 powerCost = 0;
 
-            cost.Power = power.PowerType;
-            cost.Amount = powerCost;
-            return cost;
+            return new SpellPowerCost() { Power = power.PowerType, Amount = powerCost };
         }
 
         public List<SpellPowerCost> CalcPowerCost(WorldObject caster, SpellSchoolMask schoolMask, Spell spell = null)
@@ -3013,11 +3005,8 @@ namespace Game.Spells
                     if (itr != null)
                         return itr;
 
-                    SpellPowerCost cost = new();
-                    cost.Power = powerType;
-                    cost.Amount = 0;
-                    costs.Add(cost);
-                    return costs.Last();
+                    costs.Add(new SpellPowerCost() { Power = powerType, Amount = 0 });
+                return costs.Last();
                 }
 
                 foreach (SpellPowerRecord power in PowerCosts)