protected void Validate(IIndexable<CardInstance> selectedCards)
{
if (selectedCards == null)
{
return;
}
if (selectedCards.Count == 0)
{
throw new InteractionValidationFailException("Zero-length array is not allowed.");
}
else if (Mode == SelectMode.Single && selectedCards.Count > 1)
{
throw new InteractionValidationFailException("Only one card can be selected.");
}
else if (!selectedCards.Unique())
{
throw new InteractionValidationFailException("The selected cards has duplicate.");
}
else if (selectedCards.Any(card => !Candidates.Contains(card)))
{
throw new InteractionValidationFailException("Some of the cards can't be selected.");
}
}