web/packages/common/utils/numberFormatting.ts

import { CurrencyEnum } from "../constants/currency"
import { PointType } from "../constants/pointType"
import { logger } from "../logger"

import type { IntlShape } from "react-intl"

/**
 * Function to parse number with single decimal if any
 * @param n
 * @returns number in float type with single digit decimal if any
 */
export function getSingleDecimal(n: Number | string) {
  return parseFloat(Number(n).toFixed(1))
}

/**
 * Function to parse number for i18n format for prices with currency
 * @param intl - react-intl object
 * @param price - number to be formatted
 * @param currency - currency code
 * @param additionalPrice - number (obtained in reward nights and Corporate cheque scenarios)
 * @param additionalPriceCurrency - currency code (obtained in reward nights and Corporate cheque scenarios)
 * @param pointsType - type of points when currency is points
 * @returns localized and formatted number in string type with currency
 */
export function formatPrice(
  intl: IntlShape,
  price: number,
  currency: string | CurrencyEnum,
  additionalPrice?: number,
  additionalPriceCurrency?: string,
  pointsType?: PointType | null
) {
  const localizedPrice = intl.formatNumber(price, {
    minimumFractionDigits: 0,
    maximumFractionDigits: 2,
  })

  let formattedAdditionalPrice: string = ""
  if (additionalPrice && additionalPriceCurrency) {
    const localizedAdditionalPrice = intl.formatNumber(additionalPrice, {
      minimumFractionDigits: 0,
      maximumFractionDigits: 2,
    })
    formattedAdditionalPrice = ` + ${localizedAdditionalPrice} ${additionalPriceCurrency}`
  }

  const currencyText = getCurrencyText(intl, price, currency, pointsType)

  return `${localizedPrice} ${currencyText}${formattedAdditionalPrice}`
}

function getCurrencyText(
  intl: IntlShape,
  price: number,
  currency: string | CurrencyEnum,
  pointsType?: PointType | null
) {
  if (currency === CurrencyEnum.Voucher) {
    return intl.formatMessage(
      {
        id: "price.numberOfVouchers",
        defaultMessage:
          "{numberOfVouchers, plural, one {Voucher} other {Vouchers}}",
      },
      {
        numberOfVouchers: price,
      }
    )
  }

  if (currency === CurrencyEnum.POINTS) {
    if (!pointsType) return currency

    switch (pointsType) {
      case PointType.SCANDIC: {
        return intl.formatMessage(
          {
            id: "price.numberOfScandicPoints",
            defaultMessage:
              "{numberOfScandicPoints, plural, one {Point} other {Points}}",
          },
          {
            numberOfScandicPoints: price,
          }
        )
      }
      case PointType.EUROBONUS: {
        return intl.formatMessage(
          {
            id: "price.numberOfEuroBonusPoints",
            defaultMessage:
              "{numberOfEuroBonusPoints, plural, one {EB Point} other {EB Points}}",
          },
          {
            numberOfEuroBonusPoints: price,
          }
        )
      }
      default: {
        const _exhaustiveCheck: never = pointsType
        void _exhaustiveCheck
        logger.warn(`Unknown point type provided: ${pointsType}`)
        return currency
      }
    }
  }

  return currency
}