#![cfg(feature = "early-data")]

use std::io::{self, Read, Write};
use std::net::{SocketAddr, TcpListener};
use std::sync::Arc;
use std::thread;

use rustls::pki_types::ServerName;
use rustls::{self, ClientConfig, ServerConnection, Stream};
use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
use tokio::net::TcpStream;
use tokio_rustls::client::TlsStream;
use tokio_rustls::TlsConnector;

async fn send<S: AsyncRead + AsyncWrite + Unpin>(
    config: Arc<ClientConfig>,
    addr: SocketAddr,
    wrapper: impl Fn(TcpStream) -> S,
    data: &[u8],
    vectored: bool,
) -> io::Result<(TlsStream<S>, Vec<u8>)> {
    let connector = TlsConnector::from(config).early_data(true);
    let stream = wrapper(TcpStream::connect(&addr).await?);
    let domain = ServerName::try_from("foobar.com").unwrap();

    let mut stream = connector.connect(domain, stream).await?;
    utils::write(&mut stream, data, vectored).await?;
    stream.flush().await?;
    stream.shutdown().await?;

    let mut buf = Vec::new();
    stream.read_to_end(&mut buf).await?;

    Ok((stream, buf))
}

#[tokio::test]
async fn test_0rtt() -> io::Result<()> {
    test_0rtt_impl(|s| s, false).await
}

#[tokio::test]
async fn test_0rtt_vectored() -> io::Result<()> {
    test_0rtt_impl(|s| s, true).await
}

#[tokio::test]
async fn test_0rtt_vectored_flush_pending() -> io::Result<()> {
    test_0rtt_impl(utils::FlushWrapper::new, false).await
}

async fn test_0rtt_impl<S: AsyncRead + AsyncWrite + Unpin>(
    wrapper: impl Fn(TcpStream) -> S,
    vectored: bool,
) -> io::Result<()> {
    let (mut server, mut client) = utils::make_configs();
    server.max_early_data_size = 8192;
    let server = Arc::new(server);

    let listener = TcpListener::bind("127.0.0.1:0")?;
    let server_port = listener.local_addr().unwrap().port();
    thread::spawn(move || loop {
        let (mut sock, _addr) = listener.accept().unwrap();

        let server = Arc::clone(&server);
        thread::spawn(move || {
            let mut conn = ServerConnection::new(server).unwrap();
            conn.complete_io(&mut sock).unwrap();

            if let Some(mut early_data) = conn.early_data() {
                let mut buf = Vec::new();
                early_data.read_to_end(&mut buf).unwrap();
                let mut stream = Stream::new(&mut conn, &mut sock);
                stream.write_all(b"EARLY:").unwrap();
                stream.write_all(&buf).unwrap();
            }

            let mut stream = Stream::new(&mut conn, &mut sock);
            stream.write_all(b"LATE:").unwrap();
            loop {
                let mut buf = [0; 1024];
                let n = stream.read(&mut buf).unwrap();
                if n == 0 {
                    conn.send_close_notify();
                    conn.complete_io(&mut sock).unwrap();
                    break;
                }
                stream.write_all(&buf[..n]).unwrap();
            }
        });
    });

    client.enable_early_data = true;
    let client = Arc::new(client);
    let addr = SocketAddr::from(([127, 0, 0, 1], server_port));

    let (io, buf) = send(client.clone(), addr, &wrapper, b"hello", vectored).await?;
    assert!(!io.get_ref().1.is_early_data_accepted());
    assert_eq!("LATE:hello", String::from_utf8_lossy(&buf));

    let (io, buf) = send(client, addr, wrapper, b"world!", vectored).await?;
    assert!(io.get_ref().1.is_early_data_accepted());
    assert_eq!("EARLY:world!LATE:", String::from_utf8_lossy(&buf));

    Ok(())
}

// Include `utils` module
include!("utils.rs");