import type { CardColor, Hand } from '../types';

export function computePlayable(hand: Hand, ledColor: CardColor | null): Set<string> {
  const keys = Object.keys(hand);
  if (!ledColor) return new Set(keys);

  const ledKeys = keys.filter((k) => hand[k].color === ledColor);
  if (ledKeys.length > 0) return new Set(ledKeys);

  const heartKeys = keys.filter((k) => hand[k].color === 'HEARTS');
  if (heartKeys.length > 0) return new Set(heartKeys);

  return new Set(keys);
}