update

src/helpers/candles.ts

@@ -1,9 +1,4 @@
-interface Candle {
-  open: number;
-  close: number;
-  low: number;
-  high: number;
-}
+import { Candle } from "../dao/candles";
 
 type PatternType =
   | "Doji"
@@ -647,3 +642,28 @@ export function isHighVolatilityCandle(candles: Candle[]): boolean {
   // A candle is considered high volatility if either its range or its body size (or both) are significantly larger
   return isRangeHigh || isBodySizeHigh;
 }
+
+function upperShadow(candle: Candle): number {
+  return candle.high - Math.max(candle.open, candle.close);
+}
+
+function lowerShadow(candle: Candle): number {
+  return Math.min(candle.open, candle.close) - candle.low;
+}
+
+export function isPinBar(candle: Candle): {isPinBar: boolean, isBullish: boolean, isBearish: boolean} {
+  const bodySize = getBodySize(candle);
+  const totalRange = getTotalRange(candle);
+  const upperShadowSize = upperShadow(candle);
+  const lowerShadowSize = lowerShadow(candle);
+
+  if (bodySize < totalRange * 0.3 && upperShadowSize > bodySize * 2) {
+    return {isPinBar: true, isBullish: true, isBearish: false};
+  }
+
+  if (bodySize < totalRange * 0.3 && lowerShadowSize > bodySize * 2) {
+    return {isPinBar: true, isBullish: false, isBearish: true};
+  }
+
+  return {isPinBar: false, isBullish: false, isBearish: false};
+}