@thuantan2060/technicalindicators/lib/candlestick/BearishHammerStick.js

Techincal Indicators written in javascript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.DEFAULT_BEARISH_HAMMER_STICK_CONFIG = void 0;
exports.bearishhammerstick = bearishhammerstick;
exports.default = void 0;
var _CandlestickFinder = _interopRequireWildcard(require("./CandlestickFinder"));
function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
/**
 * Configuration interface for BearishHammerStick pattern.
 * Extends base config with hammer-specific threshold properties.
 */

/**
 * Default configuration for BearishHammerStick pattern.
 */
const DEFAULT_BEARISH_HAMMER_STICK_CONFIG = exports.DEFAULT_BEARISH_HAMMER_STICK_CONFIG = {
  ..._CandlestickFinder.DEFAULT_CANDLESTICK_CONFIG,
  shadowSizeThresholdPercent: 0.3,
  minBodyComparisonPercent: 0.0001
};
class BearishHammerStick extends _CandlestickFinder.default {
  shadowSizeThresholdPercent;
  minBodyComparisonPercent;
  constructor(config) {
    const finalConfig = {
      ...DEFAULT_BEARISH_HAMMER_STICK_CONFIG,
      ...config
    };
    super(finalConfig);
    this.name = 'BearishHammerStick';
    this.requiredCount = 1;

    // Apply configuration with defaults
    this.shadowSizeThresholdPercent = finalConfig.shadowSizeThresholdPercent;
    this.minBodyComparisonPercent = finalConfig.minBodyComparisonPercent;
  }
  logic(data) {
    let daysOpen = data.open[0];
    let daysClose = data.close[0];
    let daysHigh = data.high[0];
    let daysLow = data.low[0];

    // Basic OHLC validation
    if (!this.validateOHLC(daysOpen, daysHigh, daysLow, daysClose)) {
      return false;
    }

    // Must be a bearish candle (red candle)
    let isBearishHammer = daysOpen > daysClose;

    // The open should be approximately equal to the high (small upper shadow)
    isBearishHammer = isBearishHammer && this.approximateEqual(daysOpen, daysHigh);

    // Calculate sizes
    let bodySize = daysOpen - daysClose;
    let lowerShadow = daysClose - daysLow;
    let totalRange = daysHigh - daysLow;

    // Ensure we have a meaningful range to work with
    if (totalRange <= 0) {
      return false;
    }

    // Handle very small bodies (doji-like hammers)
    // For shadow comparison, use actual body size but ensure a minimum threshold for very small bodies
    let minBodyThreshold = totalRange * this.minBodyComparisonPercent;
    let effectiveBodyForShadowComparison = Math.max(bodySize, minBodyThreshold);

    // The lower shadow should be at least 1.5 times the effective body size (more lenient than 2x)
    let shadowVsBodyCheck = lowerShadow >= 1.5 * effectiveBodyForShadowComparison;

    // Ensure there's a significant lower shadow relative to the total range
    // Use OR logic: either percentage-based OR body-based threshold should be satisfied
    let percentageBasedThreshold = totalRange * this.shadowSizeThresholdPercent;
    let bodyBasedThreshold = effectiveBodyForShadowComparison * 1.5; // Updated to match the check above

    let shadowVsRangeCheck = lowerShadow >= percentageBasedThreshold || lowerShadow >= bodyBasedThreshold;

    // Both checks should pass
    isBearishHammer = isBearishHammer && shadowVsBodyCheck && shadowVsRangeCheck;
    return isBearishHammer;
  }
}
exports.default = BearishHammerStick;
function bearishhammerstick(data, config = DEFAULT_BEARISH_HAMMER_STICK_CONFIG) {
  return new BearishHammerStick(config).hasPattern(data);
}
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