static GameState defended(GameState state, Card defenseCard, CardPair toDefeat)
{
var newDefender = state.defender.withCards(_ => _.Remove(defenseCard));
var newOnTable = state.onTable.Replace(
toDefeat,
new CardPair(toDefeat.placed, new Option <Card>(defenseCard))
);
return(state.withDefender(newDefender).withOnTable(newOnTable));
}
public static Option <Card> pickForDefense(
Player defender, CardPair toDefeatPair,
Suit trumpSuit, IComparer <Card> trumpComparer
)
{
var sameSuitePicks =
defender.cards
.Where(card => card.suit == toDefeatPair.placed.suit && card.CompareTo(toDefeatPair.placed) > 0)
.OrderBy(_ => _, trumpComparer);
var trumpCards =
defender.cards
.Where(card =>
card.suit == trumpSuit && (
toDefeatPair.placed.suit != trumpSuit ||
card.CompareTo(toDefeatPair.placed) > 0
)
)
.OrderBy(_ => _, trumpComparer);
var possiblePicks = sameSuitePicks.Concat(trumpCards);
return(possiblePicks.head());
}
