LottoDevice.js

import { Random } from "@woowacourse/mission-utils";
import Lotto from "./Lotto.js";

const DEFAULT_RANKS = [
  [1, 0],
  [2, 0],
  [3, 0],
  [4, 0],
  [5, 0],
  [0, 0],
];

class LottoDevice {
  #lottos;

  constructor() {
    this.#lottos = [];
  }

  issueLottos(amount) {
    const issuedCount = LottoDevice.getCanIssueAmount(amount);
    while (this.#lottos.length !== issuedCount) {
      const numbers = LottoDevice.getRandomLottoNumbers();
      const lotto = new Lotto(numbers);
      this.#lottos.push(lotto);
    }
  }

  getLottos() {
    return this.#lottos.map((lotto) => lotto.getLottoNumbers());
  }

  static getCanIssueAmount(amount) {
    return amount / Lotto.cost;
  }

  static getRandomLottoNumbers() {
    return Random.pickUniqueNumbersInRange(1, 30, 5).sort((a, b) => a - b);
  }

  getRankResult(winningNumbers, bonusNumber) {
    const ranks = new Map(DEFAULT_RANKS);

    this.#lottos.forEach((lotto) => {
      const rank = LottoDevice.calcRank(lotto, winningNumbers, bonusNumber);
      const prev = ranks.get(rank);
      ranks.set(rank, prev + 1);
    });

    return ranks;
  }

  static calcRank(lotto, numbers, bonusNumber) {
    let correctCount = 0;
    const lottoNumbers = lotto.getLottoNumbers();

    numbers.forEach((n) => {
      if (lottoNumbers.includes(n)) correctCount += 1;
    });
    const isBonusNumCorrect = lottoNumbers.includes(bonusNumber);

    if (correctCount === 5) return 1;
    if (correctCount === 4 && isBonusNumCorrect) return 2;
    if (correctCount === 4) return 3;
    if (correctCount === 3 && isBonusNumCorrect) return 4;
    if (correctCount === 2 && isBonusNumCorrect) return 5;
    return 0;
  }
}

export default LottoDevice;