import type Rule from './rule'
import Card from '../card'

let rule: Rule
rule = function(pile) {
  if (pile.cards.length < 1) return null

  return pile
    .cards
    .reduce((accumulator: Card, card: Card) => {
      if (card.decimalIndex > accumulator.decimalIndex) return card
      return accumulator
    }, pile.cards[0] as Card)
}
export default rule