Indicador Supertrend

//@version=6
indicator("Supertrend Indicator", overlay=true)
atrLen = input.int(10,  "ATR Length")
mult   = input.float(3.0, "ATR Multiplier")
[st, direction] = ta.supertrend(mult, atrLen)
longSignal  = ta.crossover(close, st)
shortSignal = ta.crossunder(close, st)
plotshape(longSignal,  style=shape.triangleup,   location=location.belowbar, color=color.green, size=size.normal, title="Buy")
plotshape(shortSignal, style=shape.triangledown, location=location.abovebar, color=color.red,   size=size.normal, title="Sell")
plot(direction < 0 ? st : na, "Uptrend",   color=color.green, linewidth=2)
plot(direction > 0 ? st : na, "Downtrend", color=color.red,   linewidth=2)

input atrLength = 10;
input multiplier = 3.0;
def atrVal = ATR(atrLength);
def basis = (high + low) / 2;
def upper = basis + multiplier * atrVal;
def lower = basis - multiplier * atrVal;
def buySignal = close crosses above upper;
def sellSignal = close crosses below lower;
AddOrder(OrderType.BUY_AUTO, buySignal, close, 1, Color.GREEN, Color.GREEN, "Supertrend Buy");
AddOrder(OrderType.SELL_AUTO, sellSignal, close, 1, Color.RED, Color.RED, "Supertrend Exit");
plot UpperBand = upper;
UpperBand.SetDefaultColor(Color.GREEN);
plot LowerBand = lower;
LowerBand.SetDefaultColor(Color.RED);