//! Basic integration tests for iroh that can be run both in browsers & natively.
//!
//! At the moment, these tests unfortunately interact with deployed services, specifically
//! the "real" DNS server infrastructure and "real" relays.
//!
//! The main reason is that running rust code natively and simultaneously in endpoint.js via
//! wasm-bindgen-test is not trivial. We want to avoid a situation where you need to
//! remember to run *another* binary simultaneously to running `cargo test --test integration`.
//!
//! In the past we've hit relay rate-limits from all the tests in our CI, but I expect
//! we won't hit these with only this integration test.
use iroh::{
    Endpoint, RelayMode,
    address_lookup::{AddressLookup, pkarr::PkarrResolver},
    endpoint::presets,
};
use n0_error::{Result, StdResultExt};
use n0_future::{
    StreamExt, task,
    time::{self, Duration},
};
#[cfg(not(wasm_browser))]
use tokio::test;
use tracing::{Instrument, info_span};
#[cfg(wasm_browser)]
use wasm_bindgen_test::wasm_bindgen_test as test;

// Enable this if you want to run these tests in the browser.
// Unfortunately it's either-or: Enable this and you can run in the browser, disable to run in nodejs.
// #[cfg(wasm_browser)]
// wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);

const ECHO_ALPN: &[u8] = b"echo";

#[test]
async fn simple_endpoint_id_based_connection_transfer() -> Result {
    std::panic::set_hook(Box::new(console_error_panic_hook::hook));
    setup_logging();
    let client = Endpoint::builder(presets::N0)
        .relay_mode(RelayMode::Staging)
        .bind()
        .await?;
    tracing::info!("started client, id {}", client.id().fmt_short());
    let server = Endpoint::builder(presets::N0)
        .relay_mode(RelayMode::Staging)
        .alpns(vec![ECHO_ALPN.to_vec()])
        .bind()
        .await?;
    tracing::info!("started server, id {}", server.id().fmt_short());

    // ensure the server has connected to a relay
    // and therefore has enough information to publish
    tracing::info!("waiting for server to go online");
    time::timeout(Duration::from_secs(20), server.online())
        .await
        .std_context("server endpoint took too long to get online")?;

    // Make the server respond to requests with an echo
    task::spawn({
        tracing::info!("waiting for incoming connections on the server");
        let server = server.clone();
        async move {
            while let Some(incoming) = server.accept().await {
                tracing::info!("accepting connection");
                let conn = incoming.await?;
                let endpoint_id = conn.remote_id();
                tracing::info!(endpoint_id = %endpoint_id.fmt_short(), "Accepted connection");

                let (mut send, mut recv) = conn.accept_bi().await.anyerr()?;
                let mut bytes_sent = 0;
                while let Some(chunk) = recv.read_chunk(10_000).await.anyerr()? {
                    bytes_sent += chunk.len();
                    send.write_chunk(chunk).await.anyerr()?;
                }
                send.finish().anyerr()?;
                tracing::info!("Copied over {bytes_sent} byte(s)");

                let code = conn.closed().await;
                tracing::info!("Closed with code: {code:?}");
            }

            n0_error::Ok(())
        }
        .instrument(info_span!("server"))
    });

    // Wait for pkarr records to be published
    time::timeout(Duration::from_secs(20), {
        let endpoint_id = server.id();
        tracing::info!(
            "start timeout waiting for records to be published, waiting for {endpoint_id} address lookup"
        );
        let tls_config = server.tls_config().clone();
        async move {
            let resolver = PkarrResolver::n0_dns().build(tls_config);
            loop {
                // Very rudimentary non-backoff algorithm
                time::sleep(Duration::from_secs(1)).await;

                let Some(mut stream) = resolver.resolve(endpoint_id) else {
                    tracing::info!("unable to get resolver stream, looping");
                    continue;
                };
                let Ok(Some(item)) = stream.try_next().await else {
                    tracing::info!("no items on stream when resolving, looping");
                    continue;
                };
                if item.relay_urls().next().is_some() {
                    tracing::info!("home relay found");
                    break;
                }
            }
        }
    })
    .await
    .anyerr()?;

    tracing::info!(to = %server.id().fmt_short(), "Opening a connection");
    let conn = client.connect(server.id(), ECHO_ALPN).await?;
    tracing::info!("Connection opened");

    let (mut send, mut recv) = conn.open_bi().await.anyerr()?;
    send.write_all(b"Hello, World!").await.anyerr()?;
    send.finish().anyerr()?;
    tracing::info!("Sent request");

    let response = recv.read_to_end(10_000).await.anyerr()?;
    tracing::info!(len = response.len(), "Received response");
    assert_eq!(&response, b"Hello, World!");

    tracing::info!("Closing connection");
    conn.close(1u32.into(), b"thank you, bye");

    client.close().await;
    server.close().await;

    Ok(())
}

#[cfg(wasm_browser)]
fn setup_logging() {
    use tracing::Level;

    let mut config = wasm_tracing::WasmLayerConfig::new();
    config.set_max_level(Level::TRACE);
    wasm_tracing::set_as_global_default_with_config(config).unwrap();
}

#[cfg(not(wasm_browser))]
fn setup_logging() {
    tracing_subscriber::fmt()
        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
        .init();
}