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use std::io;
use std::net::SocketAddr;
use std::any::Any;
use std::fmt::Debug;
use std::fmt::Display;
use std::fmt::Formatter;

use tokio_core::reactor;
use tokio_io::AsyncRead;
use tokio_io::AsyncWrite;

use futures::stream::Stream;
use futures::Future;

use server_conf::ServerConf;


pub trait ToSocketListener {
    fn to_listener(&self, conf: &ServerConf) -> Box<ToTokioListener + Send>;

    fn cleanup(&self);
}

#[derive(Clone)]
pub enum AnySocketAddr {
    Inet(SocketAddr),
    Unix(String)
}

impl Display for AnySocketAddr {
    fn fmt(&self, f: &mut Formatter) -> ::std::fmt::Result {
          match *self {
            AnySocketAddr::Inet(ref inet_addr) => Display::fmt(inet_addr, f),
            AnySocketAddr::Unix(ref unix_addr) => Display::fmt(unix_addr, f),
        }
    }
}

impl AnySocketAddr {
    pub fn port(&self) -> io::Result<u16> {
         match self {
            &AnySocketAddr::Inet(ref inet_addr) => Ok(inet_addr.port()),
            &AnySocketAddr::Unix(_) =>
                Err(io::Error::new(io::ErrorKind::Other, "Cannot get port from unix domain socket"))
        }
    }
}

impl ToSocketListener for AnySocketAddr {
    fn to_listener(&self, conf: &ServerConf) -> Box<ToTokioListener + Send> {
        match self {
            &AnySocketAddr::Inet(ref inet_addr) => inet_addr.to_listener(conf),
            #[cfg(unix)]
            &AnySocketAddr::Unix(ref unix_addr) => unix_addr.to_listener(conf),
            #[cfg(not(unix))]
            // TODO: error instead of panic
            &AnySocketAddr::Unix(..) => panic!("cannot use unix sockets on non-unix"),
        }
    }

    fn cleanup(&self) {
        match self {
            &AnySocketAddr::Inet(ref inet_addr) => inet_addr.cleanup(),
            #[cfg(unix)]
            &AnySocketAddr::Unix(ref unix_addr) => unix_addr.cleanup(),
            #[cfg(not(unix))]
            &AnySocketAddr::Unix(..) => {},
        }
    }
}

impl ToClientStream for AnySocketAddr {
    fn connect(&self, handle: &reactor::Handle)
        -> Box<Future<Item=Box<StreamItem>, Error=io::Error> + Send>
    {
        match self {
            &AnySocketAddr::Inet(ref inet_addr) => inet_addr.connect(handle),
            #[cfg(unix)]
            &AnySocketAddr::Unix(ref unix_addr) => unix_addr.connect(handle),
            #[cfg(not(unix))]
            &AnySocketAddr::Unix(..) => panic!("cannot use unix sockets on non-unix"),
        }
    }
}

pub trait ToTokioListener {
    fn to_tokio_listener(self: Box<Self>, handle: &reactor::Handle) -> Box<ToServerStream>;

    fn local_addr(&self) -> io::Result<AnySocketAddr>;
}

pub trait ToServerStream {
    fn incoming(self: Box<Self>)
        -> Box<Stream<Item=(Box<StreamItem>, Box<Any>), Error=io::Error>>;
}

pub trait ToClientStream:
        Display +
        Send + Sync
{
    fn connect(&self, handle: &reactor::Handle)
        -> Box<Future<Item=Box<StreamItem>, Error=io::Error> + Send>;
}

pub trait StreamItem:
        AsyncRead +
        AsyncWrite +
        io::Read +
        io::Write +
        Debug +
        Send + Sync
{
    fn is_tcp(&self) -> bool;

    fn set_nodelay(&self, no_delay: bool) -> io::Result<()>;
}