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::*;

use server::actions::Action::*;

use server::actions::Action;

use log;

pub struct HWClient {

    sock: TcpStream,

    decoder: ProtocolDecoder,

}

impl HWClient {

        HWClient {

            sock: sock,

            decoder: ProtocolDecoder::new(),

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

        }

    }

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

        poll.register(&self.sock, token, Ready::all(),

                      PollOpt::edge())

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

        self.send_msg(Connected(utils::PROTOCOL_VERSION));

    }

    pub fn deregister(&mut self, poll: &Poll) {

        poll.deregister(&self.sock);

    }

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

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

        self.flush();

    }

    pub fn send_string(&mut self, msg: &String) {

        self.send_raw_msg(&msg.as_bytes());

    }

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

        self.send_string(&msg.to_raw_protocol());

    }

    fn flush(&mut self) {

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

        self.sock.flush();

    }

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

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

        debug!("Read {} bytes", v);

        let mut response = Vec::new();

        {

            let msgs = self.decoder.extract_messages();

            for msg in msgs {

                match msg {

                    Ping => response.push(SendMe(Pong.to_raw_protocol())),

                    Quit(Some(msg)) => response.push(ByeClient("User quit: ".to_string() + msg)),

                    Quit(None) => response.push(ByeClient("User quit".to_string())),

                    Malformed => warn!("Malformed/unknown message"),

                    Empty => warn!("Empty message"),

                    _ => unimplemented!(),

                }

            }

        }

        self.decoder.sweep();

        response

    }

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

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

        Ok(())

    }

    pub fn error(&mut self, poll: &Poll) -> Vec<Action> {

        return vec![ByeClient("Connection reset".to_string())]

    }

}