Reverse MACD (starting point)

study(title="Reverse MACD with buy/sell indicators", overlay=true)
fastMA = input(title="Fast moving average", type = integer, defval = 1, minval = 7)
slowMA = input(title="Slow moving average", type = integer, defval = 10, minval = 7)
signalLength = input(9,minval=1)

[currMacd,_,_] = macd(close[0], fastMA, slowMA, signalLength)
[prevMacd,_,_] = macd(close[1], fastMA, slowMA, signalLength)
signal = ema(currMacd, signalLength)

crossoverBear = cross(currMacd, signal) and currMacd < signal ? avg(currMacd, signal) : na
crossoverBull = cross(currMacd, signal) and currMacd > signal ? avg(currMacd, signal) : na

if close[1] < close and close[2] < close[1] and close[3] < close[2]
// then
    plotshape(crossoverBear, title='MACD-BEAR', style=shape.triangledown, text='', location=location.abovebar, color=red,
    textcolor=black, size=size.tiny)
    plotshape(crossoverBull, title='MACD-BULL', style=shape.triangleup, text='', location=location.belowbar, color=green,
    textcolor=black, size=size.tiny)

    alertcondition(crossoverBear, "MACD Bear", "MACD Bearish Crossover")
    alertcondition(crossoverBull, "MACD Bull", "MACD Bullish Crossover")