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use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Client, Request, Response, Server, Uri};
use std::net::SocketAddr;

async fn upstream_req(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
    println!("hit: {}", req.uri());
    let req_uri = req.uri();
    let upstream_uri = Uri::builder()
        .scheme("http")
        .authority("localhost:9200")
        .path_and_query(req_uri.path_and_query().unwrap().as_str())
        .build()
        .unwrap();

    let res = Client::new().get(upstream_uri).await?;
    println!("resp!");
    Ok(res)
}

async fn shutdown_signal() {
    // Wait for the CTRL+C signal
    tokio::signal::ctrl_c()
        .await
        .expect("failed to install CTRL+C signal handler");
}

async fn run_server(addr: SocketAddr) {
    println!("Listening on http://{}", addr);

    let serve_future = Server::bind(&addr)
        .serve(make_service_fn(|_| async {
            Ok::<_, hyper::Error>(service_fn(upstream_req))
        }));
    let graceful = serve_future.with_graceful_shutdown(shutdown_signal());

    if let Err(e) = graceful.await {
        eprintln!("server error: {}", e);
    }
}

#[tokio::main]
async fn main() {
  let addr = SocketAddr::from(([127, 0, 0, 1], 3030));

  run_server(addr).await;
}