defmodule Nasty do

  require Logger

  def start() do
    {:ok, lsock} =  listen()
    server_accept_loop(%{lsock: lsock})
  end

  def listen() do
    {:ok, lsock} = :socket.open(:inet, :stream, :tcp)
    :ok = :socket.bind(lsock, %{family: :inet,
                             port: 4090,
                             addr: {127, 0, 0, 1}})
    :ok = :socket.listen(lsock)

    {:ok, lsock}
  end

  def server_accept_loop(%{lsock: lsock} = state) do
    case :socket.accept(lsock, 1000) do
      {:ok, sock} ->
        #Logger.info("New connection accepted!")
        #:ok = :socket.setopt(sock, :socket, :sndbuf, 10)
        #spawn(fn -> do_recv(sock) end)
        server_accept_loop(state)
      _ ->
        server_accept_loop(state)
    end
  end

  def do_recv(sock) do
    Process.sleep(80_000)
    case recv_and_respond(sock) do
      :ok ->
        do_recv(sock)
      _ ->
        Logger.error("Problem with recv and respond")
    end
  end

  def recv_and_respond(sock) do
    case :socket.recv(sock) do
      {:ok, _msg} ->
        Logger.info("Message received, now responding!")
        :socket.shutdown(sock, :write)
        #:socket.send(sock, MLLP.Envelope.wrap_message(:binary.copy("X", 40)))
      _ ->
        :booo
    end
  end
end