private static PatienceField Move(PatienceField field, CardStack from, CardStack to)
{
if (from == null || to == null)
{
Console.WriteLine("Invalid move: unknown stack");
return(field);
}
var cardToMove = from.GetMovableCards().FirstOrDefault(c => to.CanAccept(c, from));
if (cardToMove == null)
{
Console.WriteLine("Invalid move: none of the cards on from can enter destination");
return(field);
}
return(field.Move(cardToMove, from, to));
}
public PatienceField Move(Card toMove, CardStack from, CardStack to)
{
var newto = to.Accept(toMove, from);
var newfrom = from.Remove(toMove);
var newstock = Replace(Stock, from, newfrom);
var newplaystacks = PlayStacks;
var newfinishstacks = FinishStacks;
if (from is PlayStack)
newplaystacks = newplaystacks.Select(ps => Replace(ps, from, newfrom));
else if (from is FinishStack)
newfinishstacks = newfinishstacks.Select(ps => Replace(ps, from, newfrom));
if (to is PlayStack)
newplaystacks = newplaystacks.Select(ps => Replace(ps, to, newto));
else if (to is FinishStack)
newfinishstacks = newfinishstacks.Select(ps => Replace(ps, to, newto));
return new PatienceField(newstock, newplaystacks, newfinishstacks);
}
protected override CardStack DoAccept(Card c, CardStack from)
{
return(new FinishStack(this, c));
}
protected abstract CardStack DoAccept(Card c, CardStack from);
public abstract bool CanAccept(Card c, CardStack from);
public override bool CanAccept(Card c, CardStack from)
{
return(false);
}
protected override CardStack DoAccept(Card c, CardStack from)
{
// Cards cannot return to stock
throw new InvalidOperationException();
}
