use std::{io::{Read, Write}, net::TcpListener};

const PORT: usize = 10000;
const BUFF_SIZE: usize = 1;
fn main() -> std::io::Result<()> {

    let listener = TcpListener::bind(format!("127.0.0.1:{PORT}"))?;

    for stream in listener.incoming() {
        match stream {
            Ok(mut stream) => {
                loop {
                    let mut buf: [u8; BUFF_SIZE] = [0; BUFF_SIZE];

                    if let Ok(_) = stream.read_exact(&mut buf) {
                        stream.write(&buf)?;
                    } else {
                        break;
                    }
                }
            },
            Err(e) => panic!("{:?}", e)
        }
    }

    Ok(())
}