// file: crates/ksp-onchain-transport-lib/unit_tests/ws_session.rs
// version: 1

use futures_util::SinkExt; // rust-rules: trait-import
use futures_util::StreamExt; // rust-rules: trait-import

fn local_endpoint(url: &str) -> crate::WsEndpointSettings {
    return crate::WsEndpointSettings::new(
        "local_ws",
        true,
        crate::WsProviderName::new("local-fixture"),
        crate::WsClusterName::new("local"),
        crate::WsProtocolKind::SolanaStandard,
        crate::WsEndpointUrl::parse(url).expect("local test WebSocket URL must parse"),
        crate::WsSessionSettings::default(),
    );
}

async fn bind_local_listener() -> (tokio::net::TcpListener, std::string::String) {
    let listener = tokio::net::TcpListener::bind("127.0.0.1:0").await.expect("local listener must bind");
    let address = listener.local_addr().expect("local listener must expose address");
    return (listener, format!("ws://{address}"));
}

async fn read_request(websocket: &mut tokio_tungstenite::WebSocketStream<tokio::net::TcpStream>) -> serde_json::Value {
    let message = websocket.next().await.expect("request message must exist").expect("request message must decode");
    let text = message.to_text().expect("request must be text");
    return serde_json::from_str(text).expect("request must contain JSON");
}

async fn send_result(websocket: &mut tokio_tungstenite::WebSocketStream<tokio::net::TcpStream>, request: &serde_json::Value, result: serde_json::Value) {
    let id = request.get("id").and_then(serde_json::Value::as_u64).expect("request id must be numeric");
    let response = serde_json::json!({"jsonrpc":"2.0","id":id,"result":result});
    websocket.send(tokio_tungstenite::tungstenite::Message::Text(response.to_string().into())).await.expect("local response must send");
}

#[tokio::test(flavor = "current_thread")]
async fn websocket_session_connects_and_round_trips_internal_json_rpc() {
    let (listener, url) = bind_local_listener().await;
    let server = tokio::spawn(async move {
        let (stream, _) = listener.accept().await.expect("local server must accept client");
        let mut websocket = tokio_tungstenite::accept_async(stream).await.expect("local WebSocket handshake must succeed");
        let request = read_request(&mut websocket).await;
        assert_eq!(request.get("method").and_then(serde_json::Value::as_str), std::option::Option::Some("getVersion"));
        send_result(&mut websocket, &request, serde_json::json!({"solana-core":"fixture"})).await;
    });
    let session = crate::WsSession::connect(local_endpoint(url.as_str())).await.expect("client handshake must succeed");
    assert_eq!(session.state(), crate::WsSessionState::Active);
    assert_eq!(session.snapshot().pending_request_count(), 0);
    let result = session.execute_json_rpc("getVersion", std::vec::Vec::new()).await.expect("fixture JSON-RPC call must succeed");
    assert_eq!(result.get("solana-core").and_then(serde_json::Value::as_str), std::option::Option::Some("fixture"));
    tokio::task::yield_now().await;
    assert_eq!(session.snapshot().pending_request_count(), 0);
    server.await.expect("local server task must complete");
}

#[tokio::test(flavor = "current_thread")]
async fn websocket_sessions_are_physical_and_distinct_even_for_the_same_url() {
    let (listener, url) = bind_local_listener().await;
    let server = tokio::spawn(async move {
        let first = listener.accept().await.expect("first local client must connect");
        let first_ws = tokio_tungstenite::accept_async(first.0).await.expect("first handshake must succeed");
        let second = listener.accept().await.expect("second local client must connect");
        let second_ws = tokio_tungstenite::accept_async(second.0).await.expect("second handshake must succeed");
        return (first_ws, second_ws);
    });
    let first = crate::WsSession::connect(local_endpoint(url.as_str())).await.expect("first client must connect");
    let second = crate::WsSession::connect(local_endpoint(url.as_str())).await.expect("second client must connect");
    assert_ne!(first.id(), second.id());
    assert_eq!(first.snapshot().endpoint_name(), second.snapshot().endpoint_name());
    let _ = server.await.expect("local server task must complete");
}

#[tokio::test(flavor = "current_thread")]
async fn websocket_pending_map_dispatches_out_of_order_responses_by_request_id() {
    let (listener, url) = bind_local_listener().await;
    let server = tokio::spawn(async move {
        let (stream, _) = listener.accept().await.expect("local server must accept client");
        let mut websocket = tokio_tungstenite::accept_async(stream).await.expect("local WebSocket handshake must succeed");
        let first = read_request(&mut websocket).await;
        let second = read_request(&mut websocket).await;
        send_result(&mut websocket, &second, serde_json::json!("second")).await;
        send_result(&mut websocket, &first, serde_json::json!("first")).await;
    });
    let session = crate::WsSession::connect(local_endpoint(url.as_str())).await.expect("client handshake must succeed");
    let first_session = session.clone();
    let second_session = session.clone();
    let (first, second) = tokio::join!(
        first_session.execute_json_rpc("firstMethod", std::vec::Vec::new()),
        second_session.execute_json_rpc("secondMethod", std::vec::Vec::new())
    );
    assert_eq!(first.expect("first response must dispatch"), serde_json::json!("first"));
    assert_eq!(second.expect("second response must dispatch"), serde_json::json!("second"));
    tokio::task::yield_now().await;
    assert_eq!(session.snapshot().pending_request_count(), 0);
    server.await.expect("local server task must complete");
}

#[tokio::test(flavor = "current_thread")]
async fn websocket_rpc_application_error_does_not_fail_the_physical_session() {
    let (listener, url) = bind_local_listener().await;
    let server = tokio::spawn(async move {
        let (stream, _) = listener.accept().await.expect("local server must accept client");
        let mut websocket = tokio_tungstenite::accept_async(stream).await.expect("local WebSocket handshake must succeed");
        let request = read_request(&mut websocket).await;
        let id = request.get("id").and_then(serde_json::Value::as_u64).expect("request id must be numeric");
        let response = serde_json::json!({"jsonrpc":"2.0","id":id,"error":{"code":-32602,"message":"fixture invalid params"}});
        websocket.send(tokio_tungstenite::tungstenite::Message::Text(response.to_string().into())).await.expect("local error response must send");
        let request = read_request(&mut websocket).await;
        send_result(&mut websocket, &request, serde_json::json!(true)).await;
    });
    let session = crate::WsSession::connect(local_endpoint(url.as_str())).await.expect("client handshake must succeed");
    let error = session.execute_json_rpc("badMethod", std::vec::Vec::new()).await.expect_err("RPC application error must surface");
    assert_eq!(error.code(), crate::ERROR_CODE_RPC_APPLICATION_ERROR);
    assert_eq!(session.state(), crate::WsSessionState::Active);
    let result = session.execute_json_rpc("goodMethod", std::vec::Vec::new()).await.expect("session must remain usable");
    assert_eq!(result, serde_json::json!(true));
    server.await.expect("local server task must complete");
}

#[tokio::test(flavor = "current_thread")]
async fn websocket_connection_errors_do_not_echo_url_credentials() {
    let defaults = crate::WsSessionSettings::default();
    let short_session = crate::WsSessionSettings::new(
        std::time::Duration::from_millis(150),
        defaults.close_timeout(),
        defaults.reconnect().clone(),
        defaults.resubscribe(),
        defaults.command_queue_capacity(),
        defaults.notification_queue_capacity(),
        defaults.max_active_subscriptions(),
        defaults.max_pending_requests(),
        defaults.max_message_size_bytes(),
        defaults.max_frame_size_bytes(),
        defaults.max_write_buffer_size_bytes(),
    );
    let endpoint = crate::WsEndpointSettings::new(
        "redaction_fixture",
        true,
        crate::WsProviderName::new("fixture-provider"),
        crate::WsClusterName::new("local"),
        crate::WsProtocolKind::SolanaStandard,
        crate::WsEndpointUrl::parse("ws://user:password@127.0.0.1:1/private?api-key=SECRET-CANARY").expect("test URL must parse"),
        short_session,
    );
    let error = crate::WsSession::connect(endpoint).await.expect_err("unreachable local endpoint must fail");
    let rendered = format!("{error:?}");
    assert!(!rendered.contains("SECRET-CANARY"));
    assert!(!rendered.contains("password"));
    assert!(!rendered.contains("private?"));
}