private int CalcDamage(DealDamage damage)
{
// First check for immunities, then resistance, then vulnerability (p. 197 Player's Handbook)
if (Immunities.Contains(damage.DamageType))
{
return(0);
}
int actualHpDamage = damage.Hp;
// Resistances and vulnerabilities do not stack, so one does as much as multiple.
if (Resistances.Contains(damage.DamageType))
{
actualHpDamage /= 2; // integer division correctly rounds down
}
// It is technically possible to have a resistance and a vulnerability for the same damage type.
// https://rpg.stackexchange.com/a/167448
if (Vulnerabilities.Contains(damage.DamageType))
{
actualHpDamage *= 2;
}
return(actualHpDamage);
// Possible future refactor: It's a little bit inefficient to check all of the
// lists every time, especially since this function is called from in a loop.
}
private bool IsVulnerable(DamageType damageType)
{
return(Vulnerabilities.Contains(damageType));
}