Commodity Channel Index (CCI)

//@version=6
indicator("Commodity Channel Index (CCI)", overlay=false)
length = input.int(20, "CCI Length")
r = ta.cci(close, length)
longSignal  = ta.crossover(r, -100)
shortSignal = ta.crossunder(r, 100)
plotshape(longSignal,  style=shape.triangleup,   location=location.bottom, color=color.green, size=size.small)
plotshape(shortSignal, style=shape.triangledown, location=location.top,    color=color.red,   size=size.small)
hline(100,  "+100", color=color.red,   linestyle=hline.style_dashed)
hline(0,    "Zero", color=color.gray,  linestyle=hline.style_dotted)
hline(-100, "-100", color=color.green, linestyle=hline.style_dashed)
plot(r, "CCI", color=color.new(color.purple, 0))

input length = 20;
def cci = CCI(length = length);
def buySignal = cci crosses above -100;
def sellSignal = cci crosses below 100;
AddOrder(OrderType.BUY_AUTO, buySignal, close, 1, Color.GREEN, Color.GREEN, "CCI Buy");
AddOrder(OrderType.SELL_AUTO, sellSignal, close, 1, Color.RED, Color.RED, "CCI Exit");
plot CCI_Line = cci;
CCI_Line.SetDefaultColor(Color.CYAN);