import libConfig from './libConfig'

const mathFunctionMap: { [type: string]: (x: number) => number } = {
  up: Math.ceil,
  down: Math.floor,
  off: Math.round,
  '': Math.round,
}

export default function getDisplayRoundNumber (value: number, rounding: IOrderRounding = libConfig.rounding): string {
  if (value == null) return '0'
  value = Number(value)

  const mathFunction = mathFunctionMap[rounding.type]
  if (mathFunction == null) {
    return value.toFixed(rounding.digits)
  }
  const digitsAdjust = Math.pow(10, rounding.digits)
  return (mathFunction(value * digitsAdjust) / digitsAdjust).toFixed(rounding.digits)
}