//! Tracing coverage tests
//!
//! These tests ensure tracing statements are executed during coverage runs.
//! They set up a tracing subscriber and exercise all code paths that contain
//! tracing statements.

#[cfg(feature = "tracing")]
#[cfg(test)]
mod tracing_tests {
    use announcement::Announcement;
    use std::sync::Arc;
    use std::thread;
    use std::time::Duration;
    use tracing::Level;
    use tracing_subscriber::fmt::format::FmtSpan;

    /// Test: Tracing test: all tracing paths
    ///
    /// Verifies: Verifies all tracing paths
    /// Category: tracing
    /// Test that exercises all tracing statements in src/lib.rs
    #[test]
    fn test_all_tracing_paths() {
        // Set up tracing subscriber to capture all trace/debug messages
        let subscriber = tracing_subscriber::fmt()
            .with_max_level(Level::TRACE)
            .with_span_events(FmtSpan::FULL)
            .with_test_writer()
            .finish();

        tracing::subscriber::with_default(subscriber, || {
            // Test 1: Announcement::new() - covers line 286-287
            let (announcer, announcement) = Announcement::<i32>::new();

            // Test 2: announce() - covers lines 422-423, 440, 444
            let listener = announcement.listener();
            announcer.announce(42).unwrap();
            assert_eq!(listener.try_listen(), Some(42));

            // Test 3: close() - covers lines 486, 492-493
            let (announcer2, announcement2) = Announcement::<String>::new();
            let _listener2 = announcement2.listener();
            announcer2.close();
            assert!(announcement2.is_closed());

            // Test 4: Drop (auto-close) - covers lines 531-532, 538-539
            let (announcer3, announcement3) = Announcement::<Vec<u8>>::new();
            let _listener3 = announcement3.listener();
            drop(announcer3); // Triggers Drop impl
            assert!(announcement3.is_closed());

            // Test 5: listen() async fast path - covers lines 653-654
            let (announcer4, announcement4) = Announcement::<String>::new();
            announcer4.announce("fast".to_string()).unwrap();
            let listener4 = announcement4.listener();
            let rt = tokio::runtime::Runtime::new().unwrap();
            let result = rt.block_on(async { listener4.listen().await });
            assert_eq!(result, Ok("fast".to_string()));

            // Test 6: listen() async slow path - covers lines 660-661, 666-667, 675-677, 682-683, 691
            let (announcer5, announcement5) = Announcement::<i32>::new();
            let listener5 = announcement5.listener();

            let rt2 = tokio::runtime::Runtime::new().unwrap();
            rt2.block_on(async {
                let listen_future = listener5.listen();

                // Spawn a task to announce after a delay
                let ann5_clone = announcer5;
                tokio::spawn(async move {
                    tokio::time::sleep(Duration::from_millis(10)).await;
                    ann5_clone.announce(99).unwrap();
                });

                let result = listen_future.await;
                assert_eq!(result, Ok(99));
            });

            // Test 7: listen() async with closed announcer - covers lines 660-661, 666-667, 682-683
            let (announcer6, announcement6) = Announcement::<String>::new();
            let listener6 = announcement6.listener();

            let rt3 = tokio::runtime::Runtime::new().unwrap();
            rt3.block_on(async {
                let listen_future = listener6.listen();

                // Close the announcer
                let ann6_clone = announcer6;
                tokio::spawn(async move {
                    tokio::time::sleep(Duration::from_millis(10)).await;
                    ann6_clone.close();
                });

                let result = listen_future.await;
                assert!(result.is_err());
            });
        });
    }

    /// Test: Tracing test: blocking with tracing
    ///
    /// Verifies: Verifies blocking with tracing
    /// Category: tracing
    /// Test blocking operations with tracing
    #[cfg(feature = "std")]
    #[test]
    fn test_blocking_with_tracing() {
        let subscriber = tracing_subscriber::fmt()
            .with_max_level(Level::TRACE)
            .with_test_writer()
            .finish();

        tracing::subscriber::with_default(subscriber, || {
            // listen_blocking() - exercises tracing in blocking wait
            let (announcer, announcement) = Announcement::<i32>::new();
            let listener = announcement.listener();

            thread::spawn(move || {
                thread::sleep(Duration::from_millis(10));
                announcer.announce(123).unwrap();
            });

            let result = listener.listen_blocking();
            assert_eq!(result, Ok(123));
        });
    }

    /// Test: Tracing test: concurrent tracing
    ///
    /// Verifies: Verifies concurrent tracing
    /// Category: tracing
    /// Test concurrent tracing paths
    #[test]
    fn test_concurrent_tracing() {
        let subscriber = tracing_subscriber::fmt()
            .with_max_level(Level::TRACE)
            .with_test_writer()
            .finish();

        tracing::subscriber::with_default(subscriber, || {
            let (announcer, announcement) = Announcement::<Arc<String>>::new();

            // Announce first
            announcer
                .announce(Arc::new("concurrent".to_string()))
                .unwrap();

            let mut handles = vec![];

            // Create multiple listeners concurrently after announce
            for _ in 0..10 {
                let listener = announcement.listener();
                handles.push(thread::spawn(move || listener.try_listen()));
            }

            // Verify all threads received the value
            for handle in handles {
                let result = handle.join().unwrap();
                assert_eq!(result, Some(Arc::new("concurrent".to_string())));
            }
        });
    }
}