RentPrice.js

import Price     from '../price_format'
import I18next   from 'i18next'
// noinspection ES6UnusedImports
import i18n, {ru_rule} from "../../../config/i18n"

export default class RentPrice {
  /** Среди цен на аренду (prices) найдёт минимальную цену (с учётом скидки)
   *  и выдаст отформатированную строку с учётом локали.
   *
   * @param prices          {array}   of Objects like {value, currency, uom, season, duration, discount}
   * @param country         {string}  'en', 'ru' (ISO 3166-1 alpha-2)
   * @returns               {string}  '$ 4,050 per 3 days'
   */
  static starts_from(prices, country) {
    if (!prices.length) return ''

    const min       = prices.reduce((price, data) => RentPrice.calc(data.value, data.discount) < RentPrice.calc(price.value, data.discount) ? data : price);
    const print_val = Price.format(RentPrice.calc(min.value, min.discount), min.currency.symbol, country)
    const suffix    = RentPrice.suffix(min.uom.index, min.duration, country)

    return `${print_val} ${suffix}`
  }

  /** Создаём суффикс: "в день", "в неделю",...
   *
   * @param   uom_index   {string}  day, hour, month, week
   * @param   duration    {string}  длительность периода для плюрализации суффикса
   * @param   country     {string}  en, ru (ISO 3166-1 alpha-2)
   * @returns             {string}
   */
  static suffix(uom_index, duration, country) {
    let result, d = Number(duration)

    if (country === 'ru')
      result = I18next.t(`charter_attributes.charter_${uom_index}_${ru_rule(d)}`, { lng: country, duration: d })
    else
      result = I18next.t(`charter_attributes.charter_${uom_index}`, { lng: country, duration: d, count: d})

    if (d > 1) result = result.split('.5').join('&frac12;')
    return result.split('.0').join('')
  }

  static calc(val, p) {
    return +val - (+val * (+p / 100))
  }

}

test.en.js

import RentPrice                                  from '../rent_price'
import { UOM_DAY, UOM_HOUR, UOM_MONTH, UOM_WEEK } from "../../../../config/dictionaries"

describe('.suffix [EN]', () => {

  describe('single', () => {
    test(UOM_HOUR, () => {
      expect(RentPrice.suffix(UOM_HOUR, '1.0', 'en')).toBe('per hour')
    })

    test(UOM_DAY, () => {
      expect(RentPrice.suffix(UOM_DAY, '1.0', 'en')).toBe('per day')
    })

    test(UOM_WEEK, () => {
      expect(RentPrice.suffix(UOM_WEEK, '1.0', 'en')).toBe('per week')
    })

    test(UOM_MONTH, () => {
      expect(RentPrice.suffix(UOM_MONTH, '1.0', 'en')).toBe('per month')
    })
  })

  describe('multiple', () => {
    test('2 hours', () => {
      expect(RentPrice.suffix(UOM_HOUR, '2.0', 'en')).toBe('per 2 hours')
    })

    test('6 hours', () => {
      expect(RentPrice.suffix(UOM_HOUR, '6.0', 'en')).toBe('per 6 hours')
    })

    test('2 days', () => {
      expect(RentPrice.suffix(UOM_DAY, '2.0', 'en')).toBe('per 2 days')
    })

    test('5 days', () => {
      expect(RentPrice.suffix(UOM_DAY, '5.0', 'en')).toBe('per 5 days')
    })

    test('3 weeks', () => {
      expect(RentPrice.suffix(UOM_WEEK, '3.0', 'en')).toBe('per 3 weeks')
    })

    test('5 weeks', () => {
      expect(RentPrice.suffix(UOM_WEEK, '5.0', 'en')).toBe('per 5 weeks')
    })

    test('2 months', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.0', 'en')).toBe('per 2 months')
    })

    test('5 months', () => {
      expect(RentPrice.suffix(UOM_MONTH, '5.0', 'en')).toBe('per 5 months')
    })
  })

  describe('fract', () => {
    test('0.5 hours', () => {
      expect(RentPrice.suffix(UOM_HOUR, '0.5', 'en')).toBe('per 0.5 hours')
    })
    //
    test('1.3 weeks', () => {
      expect(RentPrice.suffix(UOM_WEEK, '1.3', 'en')).toBe('per 1.3 weeks')
    })
    //
    test('2.7 months', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.7', 'en')).toBe('per 2.7 months')
    })

    test('2.5 hours', () => {
      expect(RentPrice.suffix(UOM_HOUR, '2.5', 'en')).toBe('per 2½ hours')
    })

    test('6.5 hours', () => {
      expect(RentPrice.suffix(UOM_HOUR, '6.5', 'en')).toBe('per 6½ hours')
    })

    test('2.5 days', () => {
      expect(RentPrice.suffix(UOM_DAY, '2.5', 'en')).toBe('per 2½ days')
    })

    test('5.5 days', () => {
      expect(RentPrice.suffix(UOM_DAY, '5.5', 'en')).toBe('per 5½ days')
    })

    test('3.5 weeks', () => {
      expect(RentPrice.suffix(UOM_WEEK, '3.5', 'en')).toBe('per 3½ weeks')
    })

    test('5.5 weeks', () => {
      expect(RentPrice.suffix(UOM_WEEK, '5.5', 'en')).toBe('per 5½ weeks')
    })

    test('2.5 months', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.5', 'en')).toBe('per 2½ months')
    })

    test('5.5 months', () => {
      expect(RentPrice.suffix(UOM_MONTH, '5.5', 'en')).toBe('per 5½ months')
    })
  })
})

test.ru.js

import RentPrice                                  from '../rent_price'
import { UOM_DAY, UOM_HOUR, UOM_MONTH, UOM_WEEK } from "../../../../config/dictionaries"

describe('.suffix [RU]', () => {

  describe('single', () => {
    test(UOM_HOUR, () => {
      expect(RentPrice.suffix(UOM_HOUR, '1.0', 'ru')).toBe('в час')
    })

    test(UOM_DAY, () => {
      expect(RentPrice.suffix(UOM_DAY, '1.0', 'ru')).toBe('в день')
    })

    test(UOM_WEEK, () => {
      expect(RentPrice.suffix(UOM_WEEK, '1.0', 'ru')).toBe('в неделю')
    })

    test(UOM_MONTH, () => {
      expect(RentPrice.suffix(UOM_MONTH, '1.0', 'ru')).toBe('в месяц')
    })
  })

  describe('multiple', () => {
    test('2 часа', () => {
      expect(RentPrice.suffix(UOM_HOUR, '2.0', 'ru')).toBe('за 2 часа')
    })

    test('6 часов', () => {
      expect(RentPrice.suffix(UOM_HOUR, '6.0', 'ru')).toBe('за 6 часов')
    })

    test('2 дня', () => {
      expect(RentPrice.suffix(UOM_DAY, '2.0', 'ru')).toBe('за 2 дня')
    })

    test('5 дней', () => {
      expect(RentPrice.suffix(UOM_DAY, '5.0', 'ru')).toBe('за 5 дней')
    })

    test('3 недели', () => {
      expect(RentPrice.suffix(UOM_WEEK, '3.0', 'ru')).toBe('за 3 недели')
    })

    test('5 недель', () => {
      expect(RentPrice.suffix(UOM_WEEK, '5.0', 'ru')).toBe('за 5 недель')
    })

    test('2 месяца', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.0', 'ru')).toBe('за 2 месяца')
    })

    test('5 месяцев', () => {
      expect(RentPrice.suffix(UOM_MONTH, '5.0', 'ru')).toBe('за 5 месяцев')
    })
  })

  describe('fract', () => {
    test('0.5 часа', () => {
      expect(RentPrice.suffix(UOM_HOUR, '0.5', 'ru')).toBe('за 0.5 часа')
    })

    test('6.6 часов', () => {
      expect(RentPrice.suffix(UOM_HOUR, '6.6', 'ru')).toBe('за 6.6 часов')
    })

    test('1.3 недели', () => {
      expect(RentPrice.suffix(UOM_WEEK, '1.3', 'ru')).toBe('за 1.3 недели')
    })

    test('2.7 месяцев', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.7', 'ru')).toBe('за 2.7 месяца')
    })

    //
    test('6.6 месяцев', () => {
      expect(RentPrice.suffix(UOM_MONTH, '6.6', 'ru')).toBe('за 6.6 месяцев')
    })

    test('2.5 часа', () => {
      expect(RentPrice.suffix(UOM_HOUR, '2.5', 'ru')).toBe('за 2½ часа')
    })

    test('6.5 часов', () => {
      expect(RentPrice.suffix(UOM_HOUR, '6.5', 'ru')).toBe('за 6½ часов')
    })

    test('2.5 дня', () => {
      expect(RentPrice.suffix(UOM_DAY, '2.5', 'ru')).toBe('за 2½ дня')
    })

    test('5.5 дня', () => {
      expect(RentPrice.suffix(UOM_DAY, '5.5', 'ru')).toBe('за 5½ дней')
    })

    test('3.5 недели', () => {
      expect(RentPrice.suffix(UOM_WEEK, '3.5', 'ru')).toBe('за 3½ недели')
    })

    test('5.5 недель', () => {
      expect(RentPrice.suffix(UOM_WEEK, '5.5', 'ru')).toBe('за 5½ недель')
    })

    test('2.5 месяца', () => {
      expect(RentPrice.suffix(UOM_MONTH, '2.5', 'ru')).toBe('за 2½ месяца')
    })

    test('5.5 месяцев', () => {
      expect(RentPrice.suffix(UOM_MONTH, '5.5', 'ru')).toBe('за 5½ месяцев')
    })
  })
})

zdata.json

{
  "__desc__": "Указаны цены аренды за все периоды всех сезонов. Минимальная цена - 4500, со скидкой 10% - 4050",
  "prices": {
    "list":     [
      {
        "season":   {
          "id":    1,
          "index": "low"
        },
        "uom":      {
          "id":    2,
          "index": "day"
        },
        "duration": "3.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "4500",
        "discount": "10.00"
      },
      {
        "season":   {
          "id":    2,
          "index": "high"
        },
        "uom":      {
          "id":    2,
          "index": "day"
        },
        "duration": "3.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "4500",
        "discount": "3.00"
      },
      {
        "season":   {
          "id":    1,
          "index": "low"
        },
        "uom":      {
          "id":    3,
          "index": "week"
        },
        "duration": "1.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "32000",
        "discount": "0.00"
      },
      {
        "season":   {
          "id":    2,
          "index": "high"
        },
        "uom":      {
          "id":    3,
          "index": "week"
        },
        "duration": "1.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "36000",
        "discount": "0.00"
      },
      {
        "season":   {
          "id":    1,
          "index": "low"
        },
        "uom":      {
          "id":    4,
          "index": "month"
        },
        "duration": "1.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "84456",
        "discount": "0.00"
      },
      {
        "season":   {
          "id":    2,
          "index": "high"
        },
        "uom":      {
          "id":    4,
          "index": "month"
        },
        "duration": "1.0",
        "currency": {
          "id":     1,
          "index":  "USD",
          "symbol": "$"
        },
        "value":    "109800",
        "discount": "0.00"
      }
    ],
    "business": {
      "index": "rent",
      "id":    1
    }
  }
}