obix 0.4.1

mod helpers;

use futures::stream::StreamExt;
use obix::{EventSequence, MailboxConfig, OutboxEvent, out::OutboxEventMarker};
use serde::{Deserialize, Serialize};
use serial_test::file_serial;

use helpers::{init_outbox, init_pool};

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
enum TestEvent {
    Ping(u64),
    LargePayload(String),
}

// Test the OutboxEvent derive macro
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
struct PingEvent(u64);

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
struct PongEvent(String);

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, OutboxEvent)]
#[serde(tag = "type")]
enum DerivedEvent {
    Ping(PingEvent),
    Pong(PongEvent),
    #[serde(other)]
    Unknown,
}

#[test]
fn outbox_event_derive_generates_marker_impls() {
    // Test From impls
    let ping = PingEvent(42);
    let event: DerivedEvent = ping.clone().into();
    assert_eq!(event, DerivedEvent::Ping(PingEvent(42)));

    let pong = PongEvent("hello".to_string());
    let event: DerivedEvent = pong.clone().into();
    assert_eq!(event, DerivedEvent::Pong(PongEvent("hello".to_string())));

    // Test OutboxEventMarker::as_event
    let event = DerivedEvent::Ping(PingEvent(42));
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PingEvent>>::as_event(&event),
        Some(&PingEvent(42))
    );
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PongEvent>>::as_event(&event),
        None
    );

    let event = DerivedEvent::Pong(PongEvent("test".to_string()));
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PongEvent>>::as_event(&event),
        Some(&PongEvent("test".to_string()))
    );
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PingEvent>>::as_event(&event),
        None
    );

    // Unknown variant returns None for all
    let event = DerivedEvent::Unknown;
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PingEvent>>::as_event(&event),
        None
    );
    assert_eq!(
        <DerivedEvent as OutboxEventMarker<PongEvent>>::as_event(&event),
        None
    );
}

#[tokio::test]
#[file_serial]
async fn events_via_short_circuit() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut listener = outbox.listen_persisted(None);

    let mut op = outbox.begin_op().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(0))
        .await?;
    op.commit().await?;

    let Some(event) = listener.next().await else {
        anyhow::bail!("expected event from listener");
    };
    assert!(matches!(event.payload, Some(TestEvent::Ping(0))));
    Ok(())
}

#[tokio::test]
#[file_serial]
async fn events_via_pg_notify() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut listener = outbox.listen_persisted(None);

    let mut op = pool.begin().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(0))
        .await?;
    op.commit().await?;

    let Some(event) = listener.next().await else {
        anyhow::bail!("expected event from listener");
    };
    assert!(matches!(event.payload, Some(TestEvent::Ping(0))));
    Ok(())
}

#[tokio::test]
#[file_serial]
async fn events_via_cache() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut pre_listener = outbox.listen_persisted(None);

    let mut op = pool.begin().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(0))
        .await?;
    op.commit().await?;
    pre_listener.next().await.expect("event was cached");

    let mut listener = outbox.listen_persisted(EventSequence::BEGIN);

    let Some(event) =
        tokio::time::timeout(std::time::Duration::from_secs(1), listener.next()).await?
    else {
        anyhow::bail!("expected event from listener");
    };
    assert!(matches!(event.payload, Some(TestEvent::Ping(0))));

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn events_not_in_cache_backfilled_from_pg() -> anyhow::Result<()> {
    let pool = init_pool().await?;
    let config = MailboxConfig::builder()
        .event_cache_trim_percent(50)
        .event_cache_size(2)
        .build()
        .expect("Couldn't build MailboxConfig");
    let outbox = init_outbox::<TestEvent>(&pool, config).await?;

    // Create listener before publish to track when all events are processed
    let mut pre_listener = outbox.listen_persisted(None);

    let mut op = pool.begin().await?;
    outbox
        .publish_all_persisted(&mut op, (0..10).map(TestEvent::Ping))
        .await?;
    op.commit().await?;

    // Wait for all 10 events
    tokio::time::timeout(
        std::time::Duration::from_secs(1),
        (&mut pre_listener).take(5).for_each(|_| async {}),
    )
    .await?;

    let mut listener = outbox.listen_persisted(EventSequence::BEGIN);

    // This should now work because backfill will fetch from PG even if events are not in cache
    let mut events = Vec::new();
    for _ in 0..10 {
        let event = tokio::time::timeout(std::time::Duration::from_secs(1), listener.next())
            .await
            .expect("should receive event via PG backfill")
            .expect("should have event");
        events.push(event);
    }

    // Verify we got all 10 events in order
    for (i, event) in events.iter().enumerate() {
        assert!(matches!(event.payload, Some(TestEvent::Ping(n)) if n == i as u64));
    }

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn large_payload_via_pg_notify_fetches_from_db() -> anyhow::Result<()> {
    let pool = init_pool().await?;
    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;
    let mut listener = outbox.listen_persisted(None);

    let large_string = "x".repeat(10_000);

    let expected_events = vec![
        TestEvent::Ping(0),
        TestEvent::LargePayload(large_string.clone()),
        TestEvent::Ping(1),
        TestEvent::Ping(2),
        TestEvent::LargePayload(format!("y{}", "y".repeat(9_999))),
        TestEvent::Ping(3),
        TestEvent::LargePayload(large_string.clone()),
        TestEvent::Ping(4),
    ];

    let mut op = pool.begin().await?;
    for event in &expected_events {
        outbox
            .publish_persisted_in_op(&mut op, event.clone())
            .await?;
    }
    op.commit().await?;

    let mut received_events = Vec::new();
    for i in 0..expected_events.len() {
        let event = tokio::time::timeout(std::time::Duration::from_secs(2), listener.next())
            .await
            .unwrap_or_else(|_| panic!("timeout waiting for event {}", i))
            .unwrap_or_else(|| panic!("expected event {} but got None", i));
        received_events.push(event);
    }

    for (i, (received, expected)) in received_events.iter().zip(&expected_events).enumerate() {
        let payload = received
            .payload
            .as_ref()
            .unwrap_or_else(|| panic!("event {} payload should not be None", i));

        assert_eq!(
            payload, expected,
            "event {} should match expected payload",
            i
        );
        if let TestEvent::LargePayload(s) = payload {
            assert!(
                s.len() >= 10_000,
                "event {} large payload should be complete, got {} bytes",
                i,
                s.len()
            );
        }
    }

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn large_batch_persisted_in_bounded_chunks() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let batch_size = 5;
    let total = 23;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .persist_events_batch_size(batch_size)
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut op = outbox.begin_op().await?;
    outbox
        .publish_all_persisted(&mut op, (0..10).map(TestEvent::Ping))
        .await?;
    outbox
        .publish_all_persisted(&mut op, (10..total).map(TestEvent::Ping))
        .await?;
    op.commit().await?;

    let mut listener = outbox.listen_persisted(EventSequence::BEGIN);

    let mut events = Vec::new();
    for i in 0..total {
        let event = tokio::time::timeout(std::time::Duration::from_secs(2), listener.next())
            .await
            .unwrap_or_else(|_| panic!("timeout waiting for event {i}"))
            .unwrap_or_else(|| panic!("expected event {i} but got None"));
        events.push(event);
    }

    assert_eq!(events.len() as u64, total, "all events should be persisted");

    let mut last_sequence: Option<EventSequence> = None;
    for (i, event) in events.iter().enumerate() {
        assert!(
            matches!(event.payload, Some(TestEvent::Ping(n)) if n == i as u64),
            "event {i} payload should match publish order",
        );
        if let Some(prev) = last_sequence {
            assert!(
                event.sequence > prev,
                "sequences must be strictly increasing across chunk boundaries",
            );
        }
        last_sequence = Some(event.sequence);
    }

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn sequence_gap_from_rolled_back_transaction() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut listener = outbox.listen_persisted(None);

    // Publish an event (seq N)
    let mut op = outbox.begin_op().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(0))
        .await?;
    op.commit().await?;

    let event = tokio::time::timeout(std::time::Duration::from_secs(2), listener.next())
        .await?
        .expect("should receive first event");
    assert!(matches!(event.payload, Some(TestEvent::Ping(0))));

    // Create a gap by consuming a sequence number without inserting a row
    sqlx::query!("SELECT nextval('persistent_outbox_events_sequence_seq')")
        .fetch_one(&pool)
        .await?;

    // Publish another event (seq N+2, skipping the consumed N+1)
    let mut op = outbox.begin_op().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(1))
        .await?;
    op.commit().await?;

    // Should receive the gap-filled placeholder (None payload) followed by the real event
    let gap_event = tokio::time::timeout(std::time::Duration::from_secs(5), listener.next())
        .await?
        .expect("should receive gap-filled placeholder");
    assert!(
        gap_event.payload.is_none(),
        "gap-filled event should have None payload"
    );

    let real_event = tokio::time::timeout(std::time::Duration::from_secs(2), listener.next())
        .await?
        .expect("should receive real event after gap");
    assert!(matches!(real_event.payload, Some(TestEvent::Ping(1))));

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn ephemeral_events_via_cache() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut listener = outbox.listen_ephemeral();

    // Publish an ephemeral event
    let event_type = obix::out::EphemeralEventType::new("test_type");
    outbox
        .publish_ephemeral(event_type.clone(), TestEvent::Ping(42))
        .await?;

    // Should receive the event from the cache
    let Some(event) =
        tokio::time::timeout(std::time::Duration::from_secs(1), listener.next()).await?
    else {
        anyhow::bail!("expected event from listener");
    };
    assert_eq!(event.event_type, event_type);
    assert!(matches!(event.payload, TestEvent::Ping(42)));

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn ephemeral_events_multiple_types() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    // Publish events before creating listener
    let type1 = obix::out::EphemeralEventType::new("type1");
    let type2 = obix::out::EphemeralEventType::new("type2");

    outbox
        .publish_ephemeral(type1.clone(), TestEvent::Ping(1))
        .await?;
    outbox
        .publish_ephemeral(type2.clone(), TestEvent::Ping(2))
        .await?;

    // Give the cache time to process
    tokio::time::sleep(std::time::Duration::from_millis(100)).await;

    // Create listener - should receive backfill of current events
    let mut listener = outbox.listen_ephemeral();

    let mut received_events = Vec::new();
    for _ in 0..2 {
        let event = tokio::time::timeout(std::time::Duration::from_secs(1), listener.next())
            .await?
            .expect("should have event");
        received_events.push(event);
    }

    // Should have received both events (order may vary since it's a HashMap)
    assert_eq!(received_events.len(), 2);
    let has_type1 = received_events.iter().any(|e| e.event_type == type1);
    let has_type2 = received_events.iter().any(|e| e.event_type == type2);
    assert!(has_type1, "should have received type1 event");
    assert!(has_type2, "should have received type2 event");

    Ok(())
}

#[tokio::test]
#[file_serial]
async fn ephemeral_events_replace_same_type() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    // Publish events of the same type - later should replace earlier
    let event_type = obix::out::EphemeralEventType::new("replaceable");

    outbox
        .publish_ephemeral(event_type.clone(), TestEvent::Ping(1))
        .await?;
    outbox
        .publish_ephemeral(event_type.clone(), TestEvent::Ping(2))
        .await?;
    outbox
        .publish_ephemeral(event_type.clone(), TestEvent::Ping(3))
        .await?;

    // Give the cache time to process
    tokio::time::sleep(std::time::Duration::from_millis(100)).await;

    // Create listener - should only receive the latest event for this type
    let mut listener = outbox.listen_ephemeral();

    let event = tokio::time::timeout(std::time::Duration::from_secs(1), listener.next())
        .await?
        .expect("should have event");

    assert_eq!(event.event_type, event_type);
    assert!(matches!(event.payload, TestEvent::Ping(3)));

    // Should not receive any more events from backfill
    let timeout_result =
        tokio::time::timeout(std::time::Duration::from_millis(200), listener.next()).await;

    assert!(
        timeout_result.is_err(),
        "should not have received additional events from backfill"
    );

    Ok(())
}

/// Regression: an event whose NOTIFY fires while the LISTEN connection is
/// down must still reach consumers.
///
/// Publishing through a plain transaction delivers exclusively via pg_notify
/// (no same-process short-circuit hook), so the event below travels the wire
/// path or not at all. The LISTEN backends are terminated *inside* the
/// publishing transaction: they die at statement time and the NOTIFY fires at
/// COMMIT moments later, guaranteeing it is sent while no listener connection
/// exists — that notification is unrecoverably lost.
///
/// Before the fix the pump ran on `PgListener::recv()`, which silently
/// swallows the reconnect marker, so a notification lost in the gap was never
/// resynced and the consumer stalled forever (and when the internal reconnect
/// itself failed, the pump task exited, dropping the notification senders and
/// killing the cache loops outright — the sb-realtime staging wedge, where
/// every outbox consumer froze mid-sequence while its listener job kept
/// heartbeating). With the fix the pump surfaces the gap (`try_recv` +
/// `NotifyMessage::Resync`) and the caches re-read the tables.
#[tokio::test]
#[file_serial]
async fn delivers_events_notified_while_listen_connection_down() -> anyhow::Result<()> {
    let pool = init_pool().await?;

    let outbox = init_outbox::<TestEvent>(
        &pool,
        MailboxConfig::builder()
            .build()
            .expect("Couldn't build MailboxConfig"),
    )
    .await?;

    let mut listener = outbox.listen_persisted(None);

    // Baseline: the pg_notify path works.
    let mut op = pool.begin().await?;
    outbox
        .publish_persisted_in_op(&mut op, TestEvent::Ping(1))
        .await?;
    op.commit().await?;

    let event = tokio::time::timeout(std::time::Duration::from_secs(10), listener.next())
        .await
        .map_err(|_| anyhow::anyhow!("baseline pg_notify delivery timed out"))?
        .ok_or_else(|| anyhow::anyhow!("listener stream ended"))?;
    assert!(matches!(event.payload, Some(TestEvent::Ping(1))));

    // Terminate every LISTEN backend and insert the event in ONE autocommit
    // statement: the backends die mid-statement and the insert trigger's
    // NOTIFY fires at that same statement's commit, before any client-side
    // reconnect round trip can complete — so the notification is
    // deterministically sent while no LISTEN connection exists. (Publishing
    // in a separate statement is racy: sqlx's eager reconnect re-subscribes off
    // a warm pool connection faster than a second round trip.)
    sqlx::query(
        r#"
        WITH kill AS (
            SELECT pg_terminate_backend(pid)
            FROM pg_stat_activity
            WHERE pid <> pg_backend_pid() AND query LIKE 'LISTEN%'
        )
        INSERT INTO persistent_outbox_events (payload)
        SELECT $1::jsonb FROM (SELECT count(*) FROM kill) _forced
        "#,
    )
    .bind(r#"{"Ping": 2}"#)
    .execute(&pool)
    .await?;

    let event = tokio::time::timeout(std::time::Duration::from_secs(10), listener.next())
        .await
        .map_err(|_| {
            anyhow::anyhow!(
                "event published while the LISTEN connection was down was never delivered \
                 (missed notification not resynced)"
            )
        })?
        .ok_or_else(|| anyhow::anyhow!("listener stream ended"))?;
    assert!(matches!(event.payload, Some(TestEvent::Ping(2))));

    Ok(())
}