###*
500 (Server Error) Response

Usage:
return res.serverError();
return res.serverError(err);
return res.serverError(err, 'some/specific/error/view');

NOTE:
If something throws in a policy or controller, or an internal
error is encountered, Sails will call `res.serverError()`
automatically.
###
module.exports = serverError = (data, options) ->
  
  # Get access to `req`, `res`, & `sails`
  req = @req
  res = @res
  sails = req._sails
  
  # Set status code
  res.status 500
  
  # Log error to console
  if data isnt `undefined`
    sails.log.error "Sending 500 (\"Server Error\") response: \n", data
  else
    sails.log.error "Sending empty 500 (\"Server Error\") response"
  
  # Only include errors in response if application environment
  # is not set to 'production'.  In production, we shouldn't
  # send back any identifying information about errors.
  data = `undefined`  if sails.config.environment is "production"
  
  # If the user-agent wants JSON, always respond with JSON
  return res.jsonx(data)  if req.wantsJSON
  
  # If second argument is a string, we take that to mean it refers to a view.
  # If it was omitted, use an empty object (`{}`)
  options = (if (typeof options is "string") then view: options else options or {})
  
  # If a view was provided in options, serve it.
  # Otherwise try to guess an appropriate view, or if that doesn't
  # work, just send JSON.
  if options.view
    res.view options.view,
      data: data

  
  # If no second argument provided, try to serve the default view,
  # but fall back to sending JSON(P) if any errors occur.
  else
    res.view "500",
      data: data
    , (err, html) ->
      
      # If a view error occured, fall back to JSON(P).
      if err
        
        #
        # Additionally:
        # • If the view was missing, ignore the error but provide a verbose log.
        if err.code is "E_VIEW_FAILED"
          sails.log.verbose "res.serverError() :: Could not locate view for error page (sending JSON instead).  Details: ", err
        
        # Otherwise, if this was a more serious error, log to the console with the details.
        else
          sails.log.warn "res.serverError() :: When attempting to render error page view, an error occured (sending JSON instead).  Details: ", err
        return res.jsonx(data)
      res.send html