import {  oneDigit,  twoDigits,  threeDigits,  GetNumericGroupTitle} from "./converter.jsx";

const convertToWords = (currency) => {
  if (currency !=0 && !currency) return "invalid input";

  let numericGroup = 1; // thousands , millions
  let result = "";

  try {
    while (currency != 0) {
      let tempResult = "";
      let remain = currency % 1000;

      if (remain < 10) tempResult = oneDigit(remain);
      else if (remain < 100) tempResult = twoDigits(remain);
      else tempResult = threeDigits(remain);

      if (tempResult)
        //for numbers like 1,000,001 that thousands part is empty
        result = `${tempResult} ${GetNumericGroupTitle(numericGroup)} ${result}`.trim();

      currency = Math.floor(currency / 1000);
      numericGroup++;
    }
    return result;
  } catch (e) {
    throw new Error("Exception in parsing");
  }
};

const completeDollarWords = (dollars, dollarAmountWord = "dollar") => {
  if (!dollars) dollars = "zero";
  return dollars + (dollars === "one" ? ` ${dollarAmountWord}` : ` ${dollarAmountWord}s`);
};

const completeCentsWords = (cents, centAmountWord = "cent") => {
  if (!cents) return "";
  return ` and ${cents} ` + (cents === "one" ? `${centAmountWord}` : `${centAmountWord}s`);
};

export const CurrencyToWords = (value, dollarText = "dollar", centText = "cent") => {
  
  const currency = (value + "").replace(" ", "").split(".");

  const dollarInWords = convertToWords(Number.parseInt(currency[0]));
  const centsInWords =
    currency.length == 2
      ? convertToWords(
          Number.parseInt(
            currency[1].length == 1 ? `${currency[1]}0` : currency[1]
          )
        )
      : "";

  return completeDollarWords(dollarInWords, dollarText) + completeCentsWords(centsInWords, centText);
};

export default CurrencyToWords;