export const mapCamelCaseToUnderscore = (obj) => {
  return Object.keys(obj).reduce((acc, curr) => {
    const newKey = curr.replace(/\.?([A-Z])/g, function (x,y) { return "_" + y.toLowerCase(); }).replace(/^_/, "");
    acc[newKey] = obj[curr];
    return acc;
  }, {});
};

export const stringifyArrayParams = (obj) => {
  return Object.keys(obj).reduce((acc, curr) => {
    if (obj[curr] instanceof Array) {
      acc[curr] = obj[curr].join(" ");
    } else {
      acc[curr] = obj[curr];
    }
    return acc;
  }, {});
};

export const formatQueryString = (queryObject) => {
  return Object.keys(queryObject)
        .map(q => `${q}=${encodeURIComponent(queryObject[q])}`)
        .join("&");
};

export default {
  mapCamelCaseToUnderscore,
  stringifyArrayParams,
  formatQueryString
};