require! \prelude-ls : {is-type, map}

errors =
  not_found: 404
  forbidden: 403
  'Error on Delete': 500

class Request

  instance: null
  sent: false

  ([@req, @res, @next]) ->
    @_Parse!

  Send: !->
    return if @sent

    if it is null
      @sent = true
      return @res.status(404).send "Cannot #{@method.toUpperCase!} #{@url}"

    if is-type 'Array' it
      it := map (-> if it.ToJSON? => it.ToJSON! else it), it

    if it.ToJSON? => @res.status(200).send it.ToJSON!
    else          => @res.status(200).send it

    @sent = true

  SendError: ->
    return if @sent

    status = it.code || errors[it.status] || 500

    it = that if it.message?

    @res.status(status).send err: it
    @sent = true

  SetInstance: !->
    if it._promise?
      it
        .Then ~>
          @req._instance = it
          @instance = it
          @next()
        .Catch ~> @SendError it
    else
      @req._instance = it
      @instance = it
      @next()

  _Parse: ->
    import @req
    @instance = @_instance if @_instance?

Request.errors = errors
module.exports = Request