From d199b0a47a77e3c1c20258aa7cb2261e61101a8b Mon Sep 17 00:00:00 2001
From: m5l14i11 <siarhei.melnik@proton.me>
Date: Tue, 1 Aug 2023 17:16:30 +0300
Subject: [PATCH] engulfing

---
 ta_lib/patterns/src/engulfing.rs | 64 ++++++++++++++++++++++++++++++++
 ta_lib/patterns/src/lib.rs       |  1 +
 2 files changed, 65 insertions(+)
 create mode 100644 ta_lib/patterns/src/engulfing.rs

diff --git a/ta_lib/patterns/src/engulfing.rs b/ta_lib/patterns/src/engulfing.rs
new file mode 100644
index 00000000..28834a64
--- /dev/null
+++ b/ta_lib/patterns/src/engulfing.rs
@@ -0,0 +1,64 @@
+use core::series::Series;
+
+pub fn bullish(open: &[f64], high: &[f64], low: &[f64], close: &[f64]) -> Vec<bool> {
+    let open = Series::from(open);
+    let high = Series::from(high);
+    let low = Series::from(low);
+    let close = Series::from(close);
+
+    let body = (&close - &open).abs();
+
+    (close.gt(&open)
+        & close.shift(1).lt(&open.shift(1))
+        & high.gt(&high.shift(1))
+        & low.lt(&low.shift(1))
+        & body.gte(&(2.0 * body.shift(1))))
+    .into()
+}
+
+pub fn bearish(open: &[f64], high: &[f64], low: &[f64], close: &[f64]) -> Vec<bool> {
+    let open = Series::from(open);
+    let high = Series::from(high);
+    let low = Series::from(low);
+    let close = Series::from(close);
+
+    let body = (&close - &open).abs();
+
+    (close.lt(&open)
+        & close.shift(1).gt(&open.shift(1))
+        & high.gt(&high.shift(1))
+        & low.lt(&low.shift(1))
+        & body.gte(&(2.0 * body.shift(1))))
+    .into()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_engulfing_bullish() {
+        let open = vec![4.0, 3.0, 4.0, 3.0, 4.0];
+        let high = vec![4.5, 3.5, 4.5, 3.5, 4.5];
+        let low = vec![4.0, 3.0, 4.0, 3.0, 4.0];
+        let close = vec![4.5, 3.5, 4.5, 3.5, 4.5];
+        let expected = vec![false, false, false, false, false];
+
+        let result = bullish(&open, &high, &low, &close);
+
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    fn test_engulfing_bearish() {
+        let open = vec![4.0, 3.0, 4.0, 3.0, 4.0];
+        let high = vec![4.0, 3.0, 4.0, 3.0, 4.0];
+        let low = vec![3.5, 2.5, 3.5, 2.5, 3.5];
+        let close = vec![3.5, 2.5, 3.5, 2.5, 3.5];
+        let expected = vec![false, false, false, false, false];
+
+        let result = bearish(&open, &high, &low, &close);
+
+        assert_eq!(result, expected);
+    }
+}
diff --git a/ta_lib/patterns/src/lib.rs b/ta_lib/patterns/src/lib.rs
index 5cc852d0..d54aa706 100644
--- a/ta_lib/patterns/src/lib.rs
+++ b/ta_lib/patterns/src/lib.rs
@@ -5,6 +5,7 @@ pub mod breakaway;
 pub mod counterattack;
 pub mod doji;
 pub mod double_doji;
+pub mod engulfing;
 pub mod h;
 pub mod hexad;
 pub mod marubozu;