GearTrade MCP Server

/**
 * Smoothed Moving Average (SMMA) Indicator
 * Moving average with different smoothing method than EMA
 */

import { calculateSMA } from './moving-averages'

export function calculateSMMA(closes: number[], period: number = 14): number[] {
  if (closes.length < period) return []

  const smma: number[] = []

  // First SMMA value is SMA
  const firstSMA = calculateSMA(closes.slice(0, period), period)
  if (firstSMA.length > 0) {
    smma.push(firstSMA[0])
  }

  // Subsequent SMMA values: SMMA = (SMMA_prev * (period - 1) + close_current) / period
  for (let i = period; i < closes.length; i++) {
    const prevSMMA = smma[smma.length - 1]
    const currentClose = closes[i]
    const currentSMMA = (prevSMMA * (period - 1) + currentClose) / period
    smma.push(currentSMMA)
  }

  return smma
}