demo.js

import { pipe, gt, any, not, either, propEq } from 'ramda';
import { getGetter, renderState, getState } from '@/helpers/vuex';
import { paymentEnum } from '@/constant/payment-info';

/** 由 [取得運費 + 應付金額] API 取得 [分期門檻] */
const installmentLimit = renderState('AmountDetail', 'installmentLimit');

/** 小於 [信用卡分期門檻] */
const lessThanInstallmentLimit = pipe(
  getGetter('AmountDetail', 'realAmount'),
  gt(installmentLimit),
);

/** PaymentInfo 的 payments 天生就沒有 [信用卡分期] */
const noIstallmentInPayments = pipe(
  getState('PaymentInfo', 'payments'),
  any(propEq('payment', paymentEnum.creditCardInstallment)),
  not,
);

/** 小於 [信用卡分期門檻] */
/** 或 */
/** PaymentInfo 的 payments 天生就沒有 [信用卡分期] */
/** 就顯示提示訊息 */
export const isShowDesc = either(
  lessThanInstallmentLimit,
  noIstallmentInPayments,
);