use super::*;
use super::nodes::{PipeStream, RootStream};
use crate::ast::types::{PipeFn, Value};

#[test]
fn test_root_to_pipe_flow() {
    let root = RootStream::new();
    let pipe = Rc::new(RefCell::new(PipeStream::new(
        "test-pipe".to_string(),
        1,
        None,
    )));

    root.add_observer(pipe.clone());

    // Cycle 1: Root ticks 10.0
    root.tick(Value::Float(10.0));

    let sig = pipe.borrow().current_signal().unwrap();
    assert_eq!(sig.cycle_id, 1);
    if let Value::Float(v) = sig.value {
        assert_eq!(v, 10.0);
    } else {
        panic!("Value must be Float(10.0)");
    }

    // Cycle 2: Root ticks 20.0
    root.tick(Value::Float(20.0));
    let sig2 = pipe.borrow().current_signal().unwrap();
    assert_eq!(sig2.cycle_id, 2);
    if let Value::Float(v) = sig2.value {
        assert_eq!(v, 20.0);
    } else {
        panic!("Value must be Float(20.0)");
    }
}

#[test]
fn test_barrier_sync() {
    // Pipe with 2 inputs
    let pipe = Rc::new(RefCell::new(PipeStream::new(
        "barrier-pipe".to_string(),
        2,
        None,
    )));

    // Manual notifications simulate different input streams
    pipe.borrow_mut().notify(0, 1, Value::Float(10.0));
    assert!(
        pipe.borrow().current_signal().is_none(),
        "Barrier should NOT be reached after 1st input"
    );

    pipe.borrow_mut().notify(1, 1, Value::Float(20.0));
    assert!(
        pipe.borrow().current_signal().is_some(),
        "Barrier SHOULD be reached after 2nd input"
    );

    let sig = pipe.borrow().current_signal().unwrap();
    assert_eq!(sig.cycle_id, 1);
}

/// Validates the wrapper-executor pattern for `pipe-series`:
/// A closure wraps push + fill gate + user lambda, reusing standard PipeStream.
#[test]
fn test_buffered_pipe_fill_gate() {
    use crate::ast::rtl::series::data::ScalarSeries;
    use crate::ast::types::SeriesStorage;

    let root = RootStream::new();

    // Internal series with lookback 3 (simulates what pipe-series creates)
    let series: Rc<dyn SeriesStorage> =
        Rc::new(ScalarSeries::<f64>::new("FloatSeries", 3));
    let series_clone = Rc::clone(&series);

    // Wrapper-executor: push → fill gate → user lambda (s[0] + s[1])
    let mut fill_gate_open = false;
    let lookback: usize = 3;
    let wrapper: Box<PipeFn> = Box::new(move |args: &[Value]| {
        // 1. Push incoming value into internal series
        series_clone
            .as_pushable()
            .unwrap()
            .push_value(args[0].clone());

        // 2. Fill gate: wait until series has enough data
        if !fill_gate_open {
            if series_clone.len() >= lookback {
                fill_gate_open = true;
            } else {
                return Value::Void; // Filtered by PipeStream::notify
            }
        }

        // 3. User lambda: s[0] + s[1] (two most recent values)
        let v0 = series_clone.get_item(0).unwrap();
        let v1 = series_clone.get_item(1).unwrap();
        if let (Value::Float(a), Value::Float(b)) = (&v0, &v1) {
            Value::Float(a + b)
        } else {
            Value::Void
        }
    });

    // Wire up: RootStream → PipeStream with wrapper executor (manual wiring)
    let pipe = Rc::new(RefCell::new(PipeStream::new_typed(
        "buffered-test".to_string(),
        1,
        Some(wrapper),
        StaticType::Float,
    )));
    root.add_observer(pipe.clone());

    // Tick 1: series has 1 element → fill gate closed → Void → no signal
    root.tick(Value::Float(10.0));
    assert!(
        pipe.borrow().current_signal().is_none(),
        "Tick 1: fill gate should block (1 < 3)"
    );

    // Tick 2: series has 2 elements → still blocked
    root.tick(Value::Float(20.0));
    assert!(
        pipe.borrow().current_signal().is_none(),
        "Tick 2: fill gate should block (2 < 3)"
    );

    // Tick 3: series has 3 elements → fill gate opens → s[0]+s[1] = 30+20 = 50
    root.tick(Value::Float(30.0));
    let sig3 = pipe.borrow().current_signal().unwrap();
    assert_eq!(sig3.cycle_id, 3);
    assert!(
        matches!(sig3.value, Value::Float(v) if (v - 50.0).abs() < f64::EPSILON),
        "Tick 3: expected 50.0 (30+20), got {:?}",
        sig3.value
    );

    // Tick 4: fill gate stays open → s[0]+s[1] = 40+30 = 70
    root.tick(Value::Float(40.0));
    let sig4 = pipe.borrow().current_signal().unwrap();
    assert_eq!(sig4.cycle_id, 4);
    assert!(
        matches!(sig4.value, Value::Float(v) if (v - 70.0).abs() < f64::EPSILON),
        "Tick 4: expected 70.0 (40+30), got {:?}",
        sig4.value
    );
}