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//! Thrusting candlestick pattern.
use crate::ohlcv::Candle;
use crate::traits::Indicator;
/// Thrusting — a 2-bar bearish continuation, deeper than In-Neck but short of a
/// piercing reversal. A long black candle in a decline is followed by a white
/// candle that opens below the black bar's low and closes well into the black
/// body — but still below its midpoint, so the bounce is not yet a reversal.
///
/// ```text
/// long body = |close − open| >= 0.5 * (high − low)
/// bar1 black & long
/// bar2 white, opens below bar1's low (open2 < low1)
/// bar2 closes above the in-neck zone but below the body midpoint
/// (close1 + 0.1·body1 < close2 < midpoint(open1, close1))
/// ```
///
/// Output is `−1.0` when the pattern completes and `0.0` otherwise. Thrusting is a
/// single-direction (bearish-only) continuation, so it never emits `+1.0`. A close
/// at or above the midpoint would be a piercing pattern instead. The first bar
/// always returns `0.0` because the two-bar window is not yet filled. Body and
/// neckline thresholds follow the geometric house style rather than TA-Lib's
/// rolling averages. Pattern-shape check only — no trend filter is applied;
/// combine with a trend indicator for actionable signals.
///
/// # Signed ±1 encoding
///
/// This detector emits the uniform candlestick sign convention shared across the
/// pattern family — `−1.0` bearish, `0.0` no pattern — so it drops straight into
/// a machine-learning feature matrix as a single dimension.
///
/// # Example
///
/// ```
/// use wickra_core::{Candle, Indicator, Thrusting};
///
/// let mut indicator = Thrusting::new();
/// indicator.update(Candle::new(15.0, 15.1, 9.0, 10.0, 1.0, 0).unwrap());
/// let out = indicator
/// .update(Candle::new(7.0, 11.6, 6.9, 11.5, 1.0, 1).unwrap());
/// assert_eq!(out, Some(-1.0));
/// ```
#[derive(Debug, Clone, Default)]
pub struct Thrusting {
prev: Option<Candle>,
has_emitted: bool,
}
impl Thrusting {
/// Construct a new Thrusting detector.
pub const fn new() -> Self {
Self {
prev: None,
has_emitted: false,
}
}
}
impl Indicator for Thrusting {
type Input = Candle;
type Output = f64;
fn update(&mut self, candle: Candle) -> Option<f64> {
self.has_emitted = true;
let prev = self.prev;
self.prev = Some(candle);
let Some(bar1) = prev else {
return Some(0.0);
};
let range1 = bar1.high - bar1.low;
if range1 <= 0.0 {
return Some(0.0);
}
let body1 = bar1.open - bar1.close;
let mid1 = f64::midpoint(bar1.open, bar1.close);
if bar1.close < bar1.open
&& body1 >= 0.5 * range1
&& candle.close > candle.open
&& candle.open < bar1.low
&& candle.close > bar1.close + 0.1 * body1
&& candle.close < mid1
{
return Some(-1.0);
}
Some(0.0)
}
fn reset(&mut self) {
self.prev = None;
self.has_emitted = false;
}
fn warmup_period(&self) -> usize {
2
}
fn is_ready(&self) -> bool {
self.has_emitted
}
fn name(&self) -> &'static str {
"Thrusting"
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::traits::BatchExt;
fn c(open: f64, high: f64, low: f64, close: f64, ts: i64) -> Candle {
Candle::new(open, high, low, close, 1.0, ts).unwrap()
}
#[test]
fn accessors_and_metadata() {
let t = Thrusting::new();
assert_eq!(t.name(), "Thrusting");
assert_eq!(t.warmup_period(), 2);
assert!(!t.is_ready());
}
#[test]
fn thrusting_is_minus_one() {
let mut t = Thrusting::new();
assert_eq!(t.update(c(15.0, 15.1, 9.0, 10.0, 0)), Some(0.0));
assert_eq!(t.update(c(7.0, 11.6, 6.9, 11.5, 1)), Some(-1.0));
}
#[test]
fn shallow_close_yields_zero() {
let mut t = Thrusting::new();
t.update(c(15.0, 15.1, 9.0, 10.0, 0));
// Closes barely into the body -> in-neck, not thrusting.
assert_eq!(t.update(c(7.0, 10.3, 6.9, 10.2, 1)), Some(0.0));
}
#[test]
fn close_past_midpoint_yields_zero() {
let mut t = Thrusting::new();
t.update(c(15.0, 15.1, 9.0, 10.0, 0));
// Closes above the midpoint -> piercing, not thrusting.
assert_eq!(t.update(c(7.0, 13.1, 6.9, 13.0, 1)), Some(0.0));
}
#[test]
fn second_bar_black_yields_zero() {
let mut t = Thrusting::new();
t.update(c(15.0, 15.1, 9.0, 10.0, 0));
assert_eq!(t.update(c(12.0, 12.1, 6.9, 11.5, 1)), Some(0.0));
}
#[test]
fn first_bar_returns_zero() {
let mut t = Thrusting::new();
assert_eq!(t.update(c(15.0, 15.1, 9.0, 10.0, 0)), Some(0.0));
}
#[test]
fn batch_equals_streaming() {
let candles: Vec<Candle> = (0..40)
.map(|i| {
let base = 100.0 + i as f64;
c(base + 5.0, base + 5.1, base - 1.0, base, i)
})
.collect();
let mut a = Thrusting::new();
let mut b = Thrusting::new();
assert_eq!(
a.batch(&candles),
candles.iter().map(|x| b.update(*x)).collect::<Vec<_>>()
);
}
#[test]
fn reset_clears_state() {
let mut t = Thrusting::new();
t.update(c(15.0, 15.1, 9.0, 10.0, 0));
t.update(c(7.0, 11.6, 6.9, 11.5, 1));
assert!(t.is_ready());
t.reset();
assert!(!t.is_ready());
assert_eq!(t.update(c(15.0, 15.1, 9.0, 10.0, 0)), Some(0.0));
}
#[test]
fn zero_range_first_bar_yields_zero() {
let mut t = Thrusting::new();
// Flat first bar (range1 == 0) -> rejected.
t.update(c(10.0, 10.0, 10.0, 10.0, 0));
assert_eq!(t.update(c(9.0, 10.0, 8.0, 9.5, 1)), Some(0.0));
}
}