//@version=2
study(title="MACD Histogram Direction Evaluator Alerts")
//src = security(tickerid, "1W", close)
src = close
fastLength = input(20, minval=1)
slowLength=input(52,minval=1)
signalLength=input(9,minval=1)
fastMA = ema(src, fastLength)
slowMA = ema(src, slowLength)
macd = fastMA - slowMA
signal = sma(macd, signalLength)
hist = macd - signal
pos_hist = max(0, hist)
neg_hist = min(0, hist)
plot(pos_hist, color=green, style=histogram, linewidth=2, title='')
plot(neg_hist, color=red, style=histogram, linewidth=2, title='')
oscMins= neg_hist > neg_hist[1] and neg_hist[1] < neg_hist[2] // this line identifies bottoms
oscMax = pos_hist < pos_hist[1] and pos_hist[1] > pos_hist[2]   // this line identifies tops
plot(oscMax ? hist : na, title="Top", style=circles, linewidth=2, color=maroon)
plot(oscMins ? hist : na, title="Bottom", style=circles, linewidth=2, color=green)

// Only trade in the direction of the overall trend. IMPORTANT! If uptrend is true then it's an upward trend.
uptrend = if hist > 0
    true
else
    false
//plot(uptrend)

//plot(macd, color=teal)
//plot(signal, color=orange)