//! Integration tests for the maestro-web reverse-proxy.
//!
//! Points maestro-web at a `MockDaemon` and exercises both the HTTP and WS
//! proxy paths end-to-end.

use maestro_testing::MockDaemon;
use std::net::{Ipv4Addr, SocketAddr};
use std::time::Duration;

use futures_util::{SinkExt, StreamExt};
use maestro_web::config::WebConfig;
use tokio::net::TcpListener;
use tokio::sync::oneshot;
use tokio_tungstenite::tungstenite::Message as WsMessage;

async fn spawn_web(daemon_url: String) -> (SocketAddr, oneshot::Sender<()>) {
    let cfg = WebConfig {
        bind_addr: SocketAddr::from((Ipv4Addr::LOCALHOST, 0)),
        daemon_url,
    };
    let router = maestro_web::router(&cfg).expect("router");
    let listener = TcpListener::bind(cfg.bind_addr).await.unwrap();
    let addr = listener.local_addr().unwrap();
    let (tx, rx) = oneshot::channel::<()>();
    tokio::spawn(async move {
        let _ = axum::serve(listener, router)
            .with_graceful_shutdown(async move {
                let _ = rx.await;
            })
            .await;
    });
    (addr, tx)
}

#[tokio::test]
async fn http_get_api_path_forwards_to_daemon() {
    let daemon = MockDaemon::start().await;
    let daemon_addr = daemon.addr();
    let (web_addr, _w) = spawn_web(format!("http://{daemon_addr}")).await;

    let body: serde_json::Value = reqwest::get(format!("http://{web_addr}/api/sessions"))
        .await
        .unwrap()
        .json()
        .await
        .unwrap();
    assert!(body.as_array().expect("array").is_empty());
}

#[tokio::test]
async fn http_get_unrelated_path_falls_back_to_spa_index() {
    let daemon = MockDaemon::start().await;
    let daemon_addr = daemon.addr();
    let (web_addr, _w) = spawn_web(format!("http://{daemon_addr}")).await;

    // The bundle is empty in test builds — the placeholder index.html serves.
    let resp = reqwest::get(format!("http://{web_addr}/some/route"))
        .await
        .unwrap();
    assert_eq!(resp.status(), reqwest::StatusCode::OK);
    let ct = resp
        .headers()
        .get(reqwest::header::CONTENT_TYPE)
        .and_then(|v| v.to_str().ok())
        .unwrap_or("");
    assert!(ct.starts_with("text/html"), "ct={ct}");
}

#[tokio::test]
async fn ws_api_attach_forwards_to_daemon_and_echoes() {
    let daemon = MockDaemon::start().await;
    let id = uuid::Uuid::from_u128(7);
    daemon.add_session(maestro_testing::session(id, "/home/mock", "bash"));
    let daemon_addr = daemon.addr();
    let (web_addr, _w) = spawn_web(format!("http://{daemon_addr}")).await;

    let url = format!("ws://{web_addr}/api/attach/{id}");
    let (mut ws, _) = tokio_tungstenite::connect_async(url).await.unwrap();
    ws.send(WsMessage::Binary(b"hello".to_vec())).await.unwrap();

    let echoed = tokio::time::timeout(Duration::from_secs(1), ws.next())
        .await
        .unwrap();
    match echoed {
        Some(Ok(WsMessage::Binary(b))) => assert_eq!(b, b"hello"),
        other => panic!("unexpected frame: {other:?}"),
    }
}

/// The client is upgraded before the upstream connection is attempted, so an
/// upstream rejection has to come back as a close code. This is the end-to-end
/// counterpart to `upstream_close_reason`, which had only unit tests: the
/// daemon's own message must reach the browser rather than a generic failure.
#[tokio::test]
async fn ws_attach_to_an_unknown_session_closes_with_the_daemon_reason() {
    let daemon = MockDaemon::start().await;
    let (web_addr, _w) = spawn_web(format!("http://{}", daemon.addr())).await;

    let url = format!("ws://{web_addr}/api/attach/{}", uuid::Uuid::new_v4());
    let (mut ws, _) = tokio_tungstenite::connect_async(url)
        .await
        .expect("upgrade");

    let frame = tokio::time::timeout(Duration::from_secs(2), ws.next())
        .await
        .expect("close frame");
    match frame {
        Some(Ok(WsMessage::Close(Some(cf)))) => {
            assert_eq!(u16::from(cf.code), 4502);
            assert!(
                cf.reason.contains("no such session"),
                "expected the daemon's message, got {:?}",
                cf.reason
            );
        }
        other => panic!("expected a Close frame with a reason, got {other:?}"),
    }
}

#[tokio::test]
async fn proxy_returns_502_when_daemon_unreachable() {
    // Bind a port, immediately drop the listener, hand the address to the
    // proxy. Connections to it will be refused.
    let listener = TcpListener::bind(SocketAddr::from((Ipv4Addr::LOCALHOST, 0)))
        .await
        .unwrap();
    let dead_addr = listener.local_addr().unwrap();
    drop(listener);

    let (web_addr, _w) = spawn_web(format!("http://{dead_addr}")).await;

    let resp = reqwest::get(format!("http://{web_addr}/api/sessions"))
        .await
        .unwrap();
    assert_eq!(resp.status(), reqwest::StatusCode::BAD_GATEWAY);
    let body: serde_json::Value = resp.json().await.unwrap();
    assert_eq!(body["error"]["code"], "proxy_failed");
}