Retrações e extensões de Fibonacci

//@version=6
strategy("Fibonacci Retracement & Extensions", overlay=true)
lookback = input.int(100, "Swing Lookback")
hi = ta.highest(high, lookback)
lo = ta.lowest(low, lookback)
range = hi - lo
fib50 = hi - range * 0.5
fib618 = hi - range * 0.618
trend = ta.ema(close, 55)
longSignal = close > trend and close < fib50 and close > fib618
exitSignal = close > hi or close < fib618
if longSignal
  strategy.entry("Long", strategy.long)
if exitSignal
  strategy.close("Long")
plot(fib50, "Fib 0.5", color=color.orange)
plot(fib618, "Fib 0.618", color=color.aqua)

input lookback = 100;
def hi = Highest(high, lookback);
def lo = Lowest(low, lookback);
def range = hi - lo;
def fib50 = hi - range * 0.5;
def fib618 = hi - range * 0.618;
def trend = ExpAverage(close, 55);
def buySignal = close > trend and close < fib50 and close > fib618;
def sellSignal = close > hi or close < fib618;
AddOrder(OrderType.BUY_AUTO, buySignal, close, 1, Color.GREEN, Color.GREEN, "Fibonacci Buy");
AddOrder(OrderType.SELL_AUTO, sellSignal, close, 1, Color.RED, Color.RED, "Fibonacci Exit");
plot Fib50 = fib50;
Fib50.SetDefaultColor(Color.ORANGE);
plot Fib618 = fib618;
Fib618.SetDefaultColor(Color.CYAN);