'use strict';

const Stream = require('stream');
const Koa = require('../..');

module.exports = function(req, res){
  const socket = new Stream.Duplex();
  req = req || { headers: {}, socket: socket, __proto__: Stream.Readable.prototype };
  res = res || { _headers: {}, socket: socket, __proto__: Stream.Writable.prototype };
  res.getHeader = function(k){ return res._headers[k.toLowerCase()]; };
  res.setHeader = function(k, v){ res._headers[k.toLowerCase()] = v; };
  res.removeHeader = function(k, v){ delete res._headers[k.toLowerCase()]; };
  return (new Koa()).createContext(req, res);
};

module.exports.request = function(req, res){
  return module.exports(req, res).request;
};

module.exports.response = function(req, res){
  return module.exports(req, res).response;
};