//! Echo example.
//! Use `nc 127.0.0.1 30000` to connect.

use futures::StreamExt;
use mini_rust_runtime::executor::Executor;
use mini_rust_runtime::tcp::TcpListener;
use tokio::io::{AsyncReadExt, AsyncWriteExt};

fn main() {
    let ex = Executor::new(); // 执行器实例
    ex.block_on(test); // 协程最开始的地方
}

async fn test(){
    let test1 = serve;
    let test2= serve2;
    // 并发执行 test1 test2
    let ((),()) = futures::join!(test1(), test2());
}

async fn serve2(){
    let mut listener2 = TcpListener::bind("127.0.0.1:30001").unwrap(); // 绑定地址:端口
    while let Some(ret) = listener2.next().await {
        if let Ok((mut stream, addr)) = ret {
            println!("accept a new connection from {} successfully", addr);
            let f = async move {
                let mut buf = [0; 4096];
                loop {
                    match stream.read(&mut buf).await {
                        Ok(n) => {
                            if n == 0 || stream.write_all(&buf[..n]).await.is_err() {
                                // 回写
                                return;
                            }
                        }
                        Err(_) => {
                            return;
                        }
                    }
                }
            };
            Executor::spawn(f);
        }
    }
}

async fn serve() {
    let mut listener = TcpListener::bind("127.0.0.1:30000").unwrap(); // 绑定地址:端口
    while let Some(ret) = listener.next().await {
        if let Ok((mut stream, addr)) = ret {
            println!("accept a new connection from {} successfully", addr);
            let f = async move {
                let mut buf = [0; 4096];
                loop {
                    match stream.read(&mut buf).await {
                        Ok(n) => {
                            if n == 0 || stream.write_all(&buf[..n]).await.is_err() {
                                // 回写
                                return;
                            }
                        }
                        Err(_) => {
                            return;
                        }
                    }
                }
            };
            Executor::spawn(f);
        }
    }
}