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

Techincal Indicators written in javascript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.DEFAULT_SHOOTING_STAR_CONFIG = void 0;
exports.shootingstar = shootingstar;
var _CandlestickFinder = _interopRequireWildcard(require("./CandlestickFinder"));
var _AverageLoss = require("../Utils/AverageLoss");
var _AverageGain = require("../Utils/AverageGain");
var _BearishInvertedHammerStick = require("./BearishInvertedHammerStick");
var _BullishInvertedHammerStick = require("./BullishInvertedHammerStick");
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 ShootingStar pattern.
 * Only requires scale parameter since this pattern uses direct price comparisons.
 */

/**
 * Default configuration for ShootingStar pattern.
 */
const DEFAULT_SHOOTING_STAR_CONFIG = exports.DEFAULT_SHOOTING_STAR_CONFIG = {
  ..._CandlestickFinder.DEFAULT_CANDLESTICK_CONFIG
};
class ShootingStar extends _CandlestickFinder.default {
  constructor(config) {
    const finalConfig = {
      ...DEFAULT_SHOOTING_STAR_CONFIG,
      ...config
    };
    super(finalConfig);
    this.name = 'ShootingStar';
    this.requiredCount = 5;
  }
  logic(data) {
    // Validate data integrity first
    for (let i = 0; i < data.close.length; i++) {
      if (!this.validateOHLC(data.open[i], data.high[i], data.low[i], data.close[i])) {
        return false;
      }
    }
    let isPattern = this.upwardTrend(data);
    isPattern = isPattern && this.includesInvertedHammer(data);
    isPattern = isPattern && this.hasConfirmation(data);
    return isPattern;
  }
  upwardTrend(data, confirm = true) {
    let end = confirm ? 3 : 4;

    // Ensure we have enough data
    if (data.close.length < end) {
      return false;
    }

    // Analyze trends in closing prices of the first three or four candlesticks
    // For ascending order data, we look at the first 'end' elements
    let gains = (0, _AverageGain.averagegain)({
      values: data.close.slice(0, end),
      period: end - 1
    });
    let losses = (0, _AverageLoss.averageloss)({
      values: data.close.slice(0, end),
      period: end - 1
    });

    // Get the latest values from the arrays
    let latestGain = gains.length > 0 ? gains[gains.length - 1] : 0;
    let latestLoss = losses.length > 0 ? losses[losses.length - 1] : 0;

    // Additional validation: ensure there's actual price movement
    let closeSlice = data.close.slice(0, end);
    let priceRange = Math.max(...closeSlice) - Math.min(...closeSlice);
    let minMovement = priceRange * 0.01; // At least 1% movement

    // Upward trend, so more gains than losses, and significant movement
    return latestGain > latestLoss && latestGain > minMovement;
  }
  includesInvertedHammer(data, confirm = true) {
    // For ascending order data, the shooting star is at index 3 (4th candle)
    let start = 3;
    let end = 4;

    // Ensure we have the required data
    if (data.close.length <= start) {
      return false;
    }
    let possibleHammerData = {
      open: data.open.slice(start, end),
      close: data.close.slice(start, end),
      low: data.low.slice(start, end),
      high: data.high.slice(start, end)
    };

    // Use the updated inverted hammer functions with config objects
    let isPattern = (0, _BearishInvertedHammerStick.bearishinvertedhammerstick)(possibleHammerData, _BearishInvertedHammerStick.DEFAULT_BEARISH_INVERTED_HAMMER_CONFIG);
    isPattern = isPattern || (0, _BullishInvertedHammerStick.bullishinvertedhammerstick)(possibleHammerData, _BullishInvertedHammerStick.DEFAULT_BULLISH_INVERTED_HAMMER_STICK_CONFIG);
    return isPattern;
  }
  hasConfirmation(data) {
    // Ensure we have enough data
    if (data.close.length < 5) {
      return false;
    }

    // For ascending order data:
    // Index 3 = shooting star (4th candle)
    // Index 4 = confirmation candle (5th candle, most recent)
    let possibleStar = {
      open: data.open[3],
      close: data.close[3],
      low: data.low[3],
      high: data.high[3]
    };
    let possibleConfirmation = {
      open: data.open[4],
      close: data.close[4],
      low: data.low[4],
      high: data.high[4]
    };

    // Validate OHLC data
    if (!this.validateOHLC(possibleStar.open, possibleStar.high, possibleStar.low, possibleStar.close) || !this.validateOHLC(possibleConfirmation.open, possibleConfirmation.high, possibleConfirmation.low, possibleConfirmation.close)) {
      return false;
    }

    // Confirmation candlestick should be bearish (shooting star is bearish reversal)
    let isBearishConfirmation = possibleConfirmation.open > possibleConfirmation.close;

    // The confirmation should close lower than the shooting star's close
    // and show meaningful downward movement
    let downwardMovement = possibleStar.close - possibleConfirmation.close;
    let minMovement = (possibleStar.high - possibleStar.low) * 0.1; // At least 10% of star's range

    return isBearishConfirmation && downwardMovement > 0 && downwardMovement >= minMovement;
  }
}
exports.default = ShootingStar;
function shootingstar(data, config = DEFAULT_SHOOTING_STAR_CONFIG) {
  return new ShootingStar(config).hasPattern(data);
}
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