import Big from 'big.js';
import * as R from 'ramda';
import { formatDecimalNoRound } from './formatDecimalNoRound';
import { RestParams } from './interface';

/**
 * 大数字转小数字
 * @param translateUnit 
 */
export const bigToSmall = (translateUnit: number) => {
  return (num: number | string, params?: RestParams) => {
    const decimalNumber = params?.decimalNumber || 2;
    const fn = params?.fn || 'toFixed';

    if (R.isEmpty(num) || R.isNil(num)) return num;
    if (isNaN(Number(num))) {
      return NaN;
    }

    const newNumber = new Big(Number(num)).div(translateUnit);
    if (fn === 'toFixed') {
      return Number(newNumber.toFixed(decimalNumber));
    } else if (fn === 'floor') {
      return formatDecimalNoRound(Number(newNumber), decimalNumber);
    }

    return num;
  }
}