'use strict';

var has = Object.prototype.hasOwnProperty;

/**
 * Decode a URI encoded string.
 *
 * @param {String} input The URI encoded string.
 * @returns {String} The decoded string.
 * @api private
 */
function decode(input) {
  return decodeURIComponent(input.replace(/\+/g, ' '));
}

/**
 * Simple query string parser.
 *
 * @param {String} query The query string that needs to be parsed.
 * @returns {Object}
 * @api public
 */
function querystring(query) {
  var parser = /([^=?&]+)=?([^&]*)/g
    , result = {}
    , part;

  while (part = parser.exec(query)) {
    var key = decode(part[1])
      , value = decode(part[2]);

    //
    // Prevent overriding of existing properties. This ensures that build-in
    // methods like `toString` or __proto__ are not overriden by malicious
    // querystrings.
    //
    if (key in result) continue;
    result[key] = value;
  }

  return result;
}

/**
 * Transform a query string to an object.
 *
 * @param {Object} obj Object that should be transformed.
 * @param {String} prefix Optional prefix.
 * @returns {String}
 * @api public
 */
function querystringify(obj, prefix) {
  prefix = prefix || '';

  var pairs = [];

  //
  // Optionally prefix with a '?' if needed
  //
  if ('string' !== typeof prefix) prefix = '?';

  for (var key in obj) {
    if (has.call(obj, key)) {
      pairs.push(encodeURIComponent(key) +'='+ encodeURIComponent(obj[key]));
    }
  }

  return pairs.length ? prefix + pairs.join('&') : '';
}

//
// Expose the module.
//
exports.stringify = querystringify;
exports.parse = querystring;