import type { TarotCard } from './cards';

export type Pick = { card: TarotCard; position: string; reversed: boolean };

export function fisherYates<T>(input: T[]): T[] {
  const a = [...input];
  for (let i = a.length - 1; i > 0; i -= 1) {
    const j = Math.floor(Math.random() * (i + 1));
    [a[i], a[j]] = [a[j], a[i]];
  }
  return a;
}

export function buildShuffle(deck: TarotCard[], size: number): (TarotCard & { reversed: boolean })[] {
  return fisherYates(deck)
    .slice(0, size)
    .map((c) => ({ ...c, reversed: Math.random() < 0.5 }));
}