/*!
 * Connect - urlencoded
 * Copyright(c) 2010 Sencha Inc.
 * Copyright(c) 2011 TJ Holowaychuk
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var utils = require('../utils')
  , _limit = require('./limit')
  , qs = require('qs');

/**
 * noop middleware.
 */

function noop(req, res, next) {
  next();
}

/**
 * Urlencoded:
 * 
 *  Parse x-ww-form-urlencoded request bodies,
 *  providing the parsed object as `req.body`.
 *
 * Options:
 *
 *    - `limit`  byte limit disabled by default
 *
 * @param {Object} options
 * @return {Function}
 * @api public
 */

exports = module.exports = function(options){
  options = options || {};

  var limit = options.limit
    ? _limit(options.limit)
    : noop;

  return function urlencoded(req, res, next) {
    if (req._body) return next();
    req.body = req.body || {};

    if (!utils.hasBody(req)) return next();

    // check Content-Type
    if ('application/x-www-form-urlencoded' != utils.mime(req)) return next();

    // flag as parsed
    req._body = true;

    // parse
    limit(req, res, function(err){
      if (err) return next(err);
      var buf = '';
      req.setEncoding('utf8');
      req.on('data', function(chunk){ buf += chunk });
      req.on('end', function(){
        try {
          req.body = buf.length
            ? qs.parse(buf, options)
            : {};
        } catch (err){
          err.body = buf;
          return next(err);
        }
        next();
      });
    });
  }
};