derby = require 'derby'
{isProduction} = derby.util

module.exports = (root) ->
  staticPages = derby.createStatic root

  return (err, req, res, next) ->
    return next() unless err?

    console.log(if err.stack then err.stack else err)

    ## Customize error handling here ##
    message = err.message || err.toString()
    status = parseInt message
    if status is 404
      staticPages.render '404', res, {url: req.url}, 404
    else
      res.send if 400 <= status < 600 then status else 500