use slab;

use mio::tcp::*;

use mio::*;

use std::io::Write;

use std::io;

use netbuf;

use utils;

use protocol::ProtocolDecoder;

use protocol::messages;

use protocol::messages::HWProtocolMessage::*;

pub struct HWClient {

    sock: TcpStream,

    decoder: ProtocolDecoder,

    buf_out: netbuf::Buf

}

impl HWClient {

    pub fn new(sock: TcpStream) -> HWClient {

        HWClient {

            sock: sock,

            decoder: ProtocolDecoder::new(),

            buf_out: netbuf::Buf::new(),

        }

    }

    pub fn register(&mut self, poll: &Poll, token: Token) {

                      PollOpt::edge())

            .ok().expect("could not register socket with event loop");

    }

    fn send_raw_msg(&mut self, msg: &[u8]) {

        self.buf_out.write(msg).unwrap();

        self.flush();

    }

    fn send_msg(&mut self, msg: messages::HWProtocolMessage) {

        self.send_raw_msg(&msg.to_raw_protocol().into_bytes());

    }

    fn flush(&mut self) {

        self.buf_out.write_to(&mut self.sock).unwrap();

        self.sock.flush();

    }

    pub fn readable(&mut self, poll: &Poll) -> io::Result<()> {

        let v = self.decoder.read_from(&mut self.sock)?;

        let mut response = Vec::new();

        {

            let msgs = self.decoder.extract_messages();

            for msg in msgs {

                match msg {

                    Ping => response.push(Pong),

                }

            }

        }

        for r in response {

            self.send_msg(r);

        }

        self.decoder.sweep();

        Ok(())

    }

    pub fn writable(&mut self, poll: &Poll) -> io::Result<()> {

        self.buf_out.write_to(&mut self.sock)?;

        Ok(())

    }

}