Get Trend trading Code That Actually Works

//@version=5
indicator("SuperTrend Trend Trading", shorttitle="ST Trend", overlay=true, timeframe="", timeframe_gaps=true)

// Inputs
atrPeriod = input.int(10, "ATR Length", minval=1)
factor = input.float(3.0, "Factor", minval=0.01, step=0.01)
showSignals = input.bool(true, "Show Buy/Sell Signals")
useAlerts = input.bool(true, "Enable Alerts")

// ATR Calculation
atr = ta.atr(atrPeriod)

// SuperTrend Calculation
upperBand = hl2 + (factor * atr)
lowerBand = hl2 - (factor * atr)

prevUpperBand = nz(upperBand[1], upperBand)
prevLowerBand = nz(lowerBand[1], lowerBand)

superTrend = 0.0
superTrend := close[1] > prevUpperBand ? lowerBand : close[1] < prevLowerBand ? upperBand : nz(superTrend[1], lowerBand)

trendDirection = close > superTrend ? 1 : -1
prevTrendDirection = nz(trendDirection[1], 1)

// Signals
buySignal = trendDirection == 1 and prevTrendDirection == -1
sellSignal = trendDirection == -1 and prevTrendDirection == 1

// Plots
plot(superTrend, "SuperTrend", color=trendDirection == 1 ? color.green : color.red, linewidth=2)
upperPlot = plot(trendDirection == 1 ? na : upperBand, color=color.new(color.red, 100))
lowerPlot = plot(trendDirection == -1 ? na : lowerBand, color=color.new(color.green, 100))
fill(upperPlot, lowerPlot, color=color.new(color.blue, 95), title="Fill")

plotshape(showSignals and buySignal, "Buy", shape.labelup, location.belowbar, color.green, text="BUY", textcolor=color.white, size=size.small)
plotshape(showSignals and sellSignal, "Sell", shape.labeldown, location.abovebar, color.red, text="SELL", textcolor=color.white, size=size.small)

// Alerts
if useAlerts
    if buySignal
        alert("SuperTrend Buy Signal: Trend turning up!", alert.freq_once_per_bar)
    if sellSignal
        alert("SuperTrend Sell Signal: Trend turning down!", alert.freq_once_per_bar)

// Background color for trend
bgcolor(trendDirection == 1 ? color.new(color.green, 95) : color.new(color.red, 95), title="Trend Background")