#![feature(async_await)]
#![deny(warnings, rust_2018_idioms)]

use tokio_udp::UdpSocket;

#[tokio::test]
async fn send_recv() -> std::io::Result<()> {
    let mut sender = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let mut receiver = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;

    sender.connect(&receiver.local_addr()?)?;
    receiver.connect(&sender.local_addr()?)?;

    let message = b"hello!";
    sender.send(message).await?;

    let mut recv_buf = [0u8; 32];
    let len = receiver.recv(&mut recv_buf[..]).await?;

    assert_eq!(&recv_buf[..len], message);
    Ok(())
}

#[tokio::test]
async fn send_to_recv_from() -> std::io::Result<()> {
    let mut sender = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let mut receiver = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;

    let message = b"hello!";
    let receiver_addr = receiver.local_addr()?;
    sender.send_to(message, &receiver_addr).await?;

    let mut recv_buf = [0u8; 32];
    let (len, addr) = receiver.recv_from(&mut recv_buf[..]).await?;

    assert_eq!(&recv_buf[..len], message);
    assert_eq!(addr, sender.local_addr()?);
    Ok(())
}

#[tokio::test]
async fn split() -> std::io::Result<()> {
    let socket = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let (mut r, mut s) = socket.split();

    let msg = b"hello";
    let addr = s.as_ref().local_addr()?;
    tokio::spawn(async move {
        s.send_to(msg, &addr).await.unwrap();
    });
    let mut recv_buf = [0u8; 32];
    let (len, _) = r.recv_from(&mut recv_buf[..]).await?;
    assert_eq!(&recv_buf[..len], msg);
    Ok(())
}

#[tokio::test]
async fn reunite() -> std::io::Result<()> {
    let socket = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let (s, r) = socket.split();
    assert!(s.reunite(r).is_ok());
    Ok(())
}

#[tokio::test]
async fn reunite_error() -> std::io::Result<()> {
    let socket = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let socket1 = UdpSocket::bind(&"127.0.0.1:0".parse().unwrap())?;
    let (s, _) = socket.split();
    let (_, r1) = socket1.split();
    assert!(s.reunite(r1).is_err());
    Ok(())
}

// pub struct ByteCodec;

// impl Decoder for ByteCodec {
//     type Item = Vec<u8>;
//     type Error = io::Error;

//     fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<Vec<u8>>, io::Error> {
//         let len = buf.len();
//         Ok(Some(buf.split_to(len).to_vec()))
//     }
// }

// impl Encoder for ByteCodec {
//     type Item = Vec<u8>;
//     type Error = io::Error;

//     fn encode(&mut self, data: Vec<u8>, buf: &mut BytesMut) -> Result<(), io::Error> {
//         buf.reserve(data.len());
//         buf.put(data);
//         Ok(())
//     }
// }

// #[test]
// fn send_framed() {
//     drop(env_logger::try_init());

//     let mut a_soc = t!(UdpSocket::bind(&t!("127.0.0.1:0".parse())));
//     let mut b_soc = t!(UdpSocket::bind(&t!("127.0.0.1:0".parse())));
//     let a_addr = t!(a_soc.local_addr());
//     let b_addr = t!(b_soc.local_addr());

//     {
//         let a = UdpFramed::new(a_soc, ByteCodec);
//         let b = UdpFramed::new(b_soc, ByteCodec);

//         let msg = b"4567".to_vec();

//         let send = a.send((msg.clone(), b_addr));
//         let recv = b.into_future().map_err(|e| e.0);
//         let (sendt, received) = t!(send.join(recv).wait());

//         let (data, addr) = received.0.unwrap();
//         assert_eq!(msg, data);
//         assert_eq!(a_addr, addr);

//         a_soc = sendt.into_inner();
//         b_soc = received.1.into_inner();
//     }

//     {
//         let a = UdpFramed::new(a_soc, ByteCodec);
//         let b = UdpFramed::new(b_soc, ByteCodec);

//         let msg = b"".to_vec();

//         let send = a.send((msg.clone(), b_addr));
//         let recv = b.into_future().map_err(|e| e.0);
//         let received = t!(send.join(recv).wait()).1;

//         let (data, addr) = received.0.unwrap();
//         assert_eq!(msg, data);
//         assert_eq!(a_addr, addr);
//     }
// }