use std::net::{TcpListener, TcpStream};
use std::thread::spawn;

use env_logger::Builder;
use log::{LevelFilter, error, info};

use tungstenite::extensions::deflate::{DeflateExt, DeflateConfigBuilder};
use tungstenite::handshake::HandshakeRole;
use tungstenite::protocol::WebSocketConfig;
use tungstenite::server::accept_with_config;
use tungstenite::{Error, HandshakeError, Message, Result};

fn must_not_block<Role: HandshakeRole>(err: HandshakeError<Role>) -> Error {
    match err {
        HandshakeError::Interrupted(_) => panic!("Bug: blocking socket would block"),
        HandshakeError::Failure(f) => f,
    }
}

fn handle_client(stream: TcpStream) -> Result<()> {
    let deflate_config = DeflateConfigBuilder::default()
        .max_message_size(None)
        .build();

    let mut socket = accept_with_config(
        stream,
        Some(WebSocketConfig {
            max_send_queue: None,
            max_frame_size: Some(16 << 20),
            encoder: DeflateExt::new(deflate_config),
        }),
    )
    .map_err(must_not_block)?;
    info!("Running test");
    loop {
        match socket.read_message()? {
            msg @ Message::Text(_) | msg @ Message::Binary(_) => {
                socket.write_message(msg)?;
            }
            Message::Ping(_) | Message::Pong(_) | Message::Close(_) => {}
        }
    }
}

fn main() {
    let mut builder = Builder::new();
    builder.filter_level(LevelFilter::Trace);
    builder.init();

    let server = TcpListener::bind("127.0.0.1:9002").unwrap();

    for stream in server.incoming() {
        spawn(move || match stream {
            Ok(stream) => {
                if let Err(err) = handle_client(stream) {
                    match err {
                        Error::ConnectionClosed | Error::Protocol(_) | Error::Utf8 => (),
                        e => error!("test: {}", e),
                    }
                }
            }
            Err(e) => error!("Error accepting stream: {}", e),
        });
    }
}