function getURL(os, extended, version) {
  const extendedStr = extended => {
    if (extended === "true") {
      return "extended_";
    } else {
      return "";
    // } else {
    //   throw new Error(`Invalid input (extended): ${extended}`);
    }
  };

  const ext = os => {
    if (os === "Windows") {
      return "zip";
    } else {
      return "tar.gz";
    }
  };

  const hugoName = `hugo_${extendedStr(extended)}${version}_${os}-64bit`;
  const baseURL = "https://github.com/gohugoio/hugo/releases/download";
  const url = `${baseURL}/v${version}/${hugoName}.${ext(os)}`;

  return url;
}

module.exports = getURL;