'use strict'
  
  var qs = require('qs')
    , querystring = require('querystring')
  
  
  function Querystring (request) {
    this.request = request
    this.lib = null
    this.useQuerystring = null
    this.parseOptions = null
    this.stringifyOptions = null
  }
  
  Querystring.prototype.init = function (options) {
    if (this.lib) {return}
  
    this.useQuerystring = options.useQuerystring
    this.lib = (this.useQuerystring ? querystring : qs)
  
    this.parseOptions = options.qsParseOptions || {}
    this.stringifyOptions = options.qsStringifyOptions || {}
  }
  
  Querystring.prototype.stringify = function (obj) {
    return (this.useQuerystring)
      ? this.rfc3986(this.lib.stringify(obj,
        this.stringifyOptions.sep || null,
        this.stringifyOptions.eq || null,
        this.stringifyOptions))
      : this.lib.stringify(obj, this.stringifyOptions)
  }
  
  Querystring.prototype.parse = function (str) {
    return (this.useQuerystring)
      ? this.lib.parse(str,
        this.parseOptions.sep || null,
        this.parseOptions.eq || null,
        this.parseOptions)
      : this.lib.parse(str, this.parseOptions)
  }
  
  Querystring.prototype.rfc3986 = function (str) {
    return str.replace(/[!'()*]/g, function (c) {
      return '%' + c.charCodeAt(0).toString(16).toUpperCase()
    })
  }
  
  Querystring.prototype.unescape = querystring.unescape
  
  exports.Querystring = Querystring