use std::{io, str};

use constants::{Nick, Pass, User};
use message::Message;

pub struct ClientBuilder {
    nick: String,
    pass: Option<String>,
    realname: String,
    username: String,

    hostname: Option<String>,

    servername: String,
    port: u16,
}

pub struct Client {
    conn: io::BufferedStream<io::TcpStream>,
}

impl ClientBuilder {
    pub fn new (nick: &str, servername: &str) -> ClientBuilder {
        ClientBuilder {
            nick: nick.to_string(),
            pass: None,
            realname: nick.to_string(),
            username: nick.to_string(),

            hostname: None,

            servername: servername.to_string(),
            port: 6667,
        }
    }

    pub fn set_pass (&mut self, pass: &str) -> &mut ClientBuilder {
        self.pass = Some(pass.to_string());
        self
    }

    pub fn set_username (&mut self, username: &str) -> &mut ClientBuilder {
        self.username = username.to_string();
        self
    }

    pub fn set_realname (&mut self, realname: &str) -> &mut ClientBuilder {
        self.realname = realname.to_string();
        self
    }

    pub fn set_hostname (&mut self, hostname: &str) -> &mut ClientBuilder {
        self.hostname = Some(hostname.to_string());
        self
    }

    pub fn set_port (&mut self, port: u16) -> &mut ClientBuilder {
        self.port = port;
        self
    }

    pub fn connect (self) -> Client {
        let nick = self.nick.clone();
        let pass = self.pass.clone();
        let hostname = match self.hostname {
            Some(ref host) => host.clone(),
            None => {
                // XXX get the name of the local end of the connection
                "localhost".to_string()
            },
        };
        let username = self.username.clone();
        let servername = self.servername.clone();
        let realname = self.realname.clone();

        let mut client = self.connect_raw();

        match pass {
            Some(pass) => {
                client.write(Message::new(None, Pass, vec![pass]));
            },
            None => {},
        }

        client.write(Message::new(None, Nick, vec![nick]));

        client.write(
            Message::new(
                None, User, vec![ username, hostname, servername, realname ],
            )
        );
        client
    }

    pub fn connect_raw (self) -> Client {
        let mut stream = io::TcpStream::connect(self.servername.as_slice(), self.port);
        Client { conn: io::BufferedStream::new(stream.unwrap()) }
    }
}

impl Client {
    pub fn read (&mut self) -> Message {
        // \n isn't valid inside a message, so this should be fine. if the \n
        // we find isn't preceded by a \r, this will be caught by the message
        // parser.
        let buf = self.conn.read_until(b'\n');
        // XXX handle different encodings
        // XXX proper error handling
        Message::parse(str::from_utf8(buf.unwrap().as_slice()).unwrap()).unwrap()
    }

    pub fn write (&mut self, msg: Message) {
        msg.write_protocol_string(&mut self.conn);
    }
}