Demon wall implementation (attack data, takes damage, dies, etc) but mostly placeholders

Zennysoft.Game.Ma.Implementation/Calculators/IDamageCalculator.cs

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+using Godot;
+using Zennysoft.Ma.Adapter.Entity;
+
+namespace Zennysoft.Ma.Adapter
+{
+  public class DamageCalculator : IDamageCalculator
+  {
+    public double CalculateDamage(double damage,
+      ElementType elementType,
+      double defense,
+      ElementalResistanceSet elementalResistanceSet,
+      bool isCriticalHit = false,
+      bool ignoreDefense = false,
+      bool ignoreElementalResistance = false)
+    {
+      var calculatedDamage = damage;
+      if (!ignoreElementalResistance)
+        calculatedDamage = CalculateElementalResistance(calculatedDamage, elementType, elementalResistanceSet);
+      if (!ignoreDefense)
+        calculatedDamage = CalculateDefenseResistance(calculatedDamage, defense);
+      if (isCriticalHit)
+        calculatedDamage *= 2;
+
+      return calculatedDamage;
+    }
+
+    private static double CalculateDefenseResistance(double incomingDamage, double defense)
+    {
+      return Mathf.Max(incomingDamage - defense, 0.0);
+    }
+
+    private static double CalculateElementalResistance(
+      double incomingDamage,
+      ElementType incomingElementType,
+      ElementalResistanceSet elementalResistanceSet)
+    {
+      var resistance = elementalResistanceSet.ElementalResistance[incomingElementType];
+      return Mathf.Max(incomingDamage - (incomingDamage * resistance), 0.0);
+    }
+  }
+
+  public interface IDamageCalculator
+  {
+    public double CalculateDamage(double damage,
+      ElementType elementType,
+      double defense,
+      ElementalResistanceSet elementalResistanceSet,
+      bool isCriticalHit = false,
+      bool ignoreDefense = false,
+      bool ignoreElementalResistance = false);
+  }
+}