Triple Band Market Model: tre bande EMA per trend long

// ============================================================
// Triple Band Market Model
// ProRealAlgos Strategy Library  |  prorealalgos.com
// Type: Trend
// Direction: Long only
// Timeframe tested: Daily
// ============================================================

// --- Settings ---
DEFPARAM CumulateOrders = false

// --- Parameters ---
positionSize = 1          // contracts per trade
fastPeriod = 50           // fast band: EMA of highs and of lows
midPeriod = 100           // middle band
slowPeriod = 200          // slow band

// --- Indicators ---
// Each band is an EMA of highs and an EMA of lows (previous bar).
// Its direction flips up above the high line and down below the low line,
// and the active line is the low line in an uptrend, the high line in a downtrend.
ONCE fastDirection = 0
ONCE midDirection = 0
ONCE slowDirection = 0

fastUpperMA = ExponentialAverage[fastPeriod](high)[1]
fastLowerMA = ExponentialAverage[fastPeriod](low)[1]
IF CustomClose > fastUpperMA THEN
  fastDirection = 1
ELSIF CustomClose < fastLowerMA THEN
  fastDirection = -1
ENDIF
IF fastDirection = -1 THEN
  fastLine = fastUpperMA
ELSE
  fastLine = fastLowerMA
ENDIF

midUpperMA = ExponentialAverage[midPeriod](high)[1]
midLowerMA = ExponentialAverage[midPeriod](low)[1]
IF CustomClose > midUpperMA THEN
  midDirection = 1
ELSIF CustomClose < midLowerMA THEN
  midDirection = -1
ENDIF
IF midDirection = -1 THEN
  midLine = midUpperMA
ELSE
  midLine = midLowerMA
ENDIF

slowUpperMA = ExponentialAverage[slowPeriod](high)[1]
slowLowerMA = ExponentialAverage[slowPeriod](low)[1]
IF CustomClose > slowUpperMA THEN
  slowDirection = 1
ELSIF CustomClose < slowLowerMA THEN
  slowDirection = -1
ENDIF
IF slowDirection = -1 THEN
  slowLine = slowUpperMA
ELSE
  slowLine = slowLowerMA
ENDIF

aboveFast = fastLine < close
aboveMid = midLine < close
aboveSlow = slowLine < close