'use strict';

const quote = /[\s"'#]/;
function stringifyPair([key, val]) {
  let strval = "";
  switch (typeof val) {
    case "string":
      try {
        JSON.parse(val);
        strval = val;
      } catch (e) {
        strval = quote.test(val) ? JSON.stringify(val) : val;
      }
      break;
    case "boolean":
    case "number":
      strval = String(val);
      break;
    case "undefined":
      strval = "";
      break;
    case "object":
      if (val !== null) {
        strval = JSON.stringify(val);
      }
      break;
  }
  return `${key}=${strval}`;
}
function stringify(obj) {
  if (typeof obj !== "object") {
    throw new Error("stringify() expects an object");
  }
  return Object.entries(obj).map(stringifyPair).join("\n");
}

module.exports = stringify;