number-name/src/systems/tl/base/hundredTimes.ts

import { Digit } from '../../../common'
import NAMES from '../names'

interface HundredTimes {
  (x100: Digit): string
}

/**
 * Get the name of some number in the hundreds place.
 * @param {number} x100 - The number in the hundreds place.
 * @returns {string} The name of the number in the hundreds place.
 */
const hundredTimes: HundredTimes = (x100) => {
  if (x100 === 0) {
    return NAMES.units[0]
  }

  const hundredFactor = NAMES.units[x100]
  let hundredFactorCombining: string
  let infix: string
  let hundredSuffixCombining: string

  switch (Number(x100)) {
    case 1:
      hundredFactorCombining = hundredFactor.slice(1)
      infix = 'n'
      hundredSuffixCombining = NAMES.hundred
      break
    case 2:
    case 5:
      hundredFactorCombining = hundredFactor
      infix = 'n'
      hundredSuffixCombining = NAMES.hundred
      break
    default:
    case 3:
    case 7:
    case 8:
      hundredFactorCombining = hundredFactor
      infix = 'ng'
      hundredSuffixCombining = NAMES.hundred
      break
    case 4:
    case 6:
    case 9:
      hundredFactorCombining = hundredFactor
      infix = 'na'
      hundredSuffixCombining = 'r' + NAMES.hundred.slice(1)
      break
  }

  return [hundredFactorCombining, infix, hundredSuffixCombining].join('')
}

export default hundredTimes