'use strict';

var toFormData = require('./toFormData');

function encode(str) {
  var charMap = {
    '!': '%21',
    "'": '%27',
    '(': '%28',
    ')': '%29',
    '~': '%7E',
    '%20': '+',
    '%00': '\x00'
  };
  return encodeURIComponent(str).replace(/[!'\(\)~]|%20|%00/g, function replacer(match) {
    return charMap[match];
  });
}

function AxiosURLSearchParams(params, options) {
  this._pairs = [];

  params && toFormData(params, this, options);
}

var prototype = AxiosURLSearchParams.prototype;

prototype.append = function append(name, value) {
  this._pairs.push([name, value]);
};

prototype.toString = function toString(encoder) {
  var _encode = encoder ? function(value) {
    return encoder.call(this, value, encode);
  } : encode;

  return this._pairs.map(function each(pair) {
    return _encode(pair[0]) + '=' + _encode(pair[1]);
  }, '').join('&');
};

module.exports = AxiosURLSearchParams;