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);
  }
}