//@version=5
strategy(title="3ATR EMA Upper Band TP", shorttitle="3ATR-UpperBand", overlay=true, currency=currency.USD, initial_capital=10000, commission_type=strategy.commission.percent, commission_value=0.1)

// Inputs
ema_length = input.int(21, "EMA Length")
atr_multiplier = input.float(3.0, "ATR Multiplier")
trail_percent = input.float(2, "Trailing Stop %")

// Calculations
ema = ta.ema(close, ema_length)
atr = ta.atr(ema_length)
upper_band = ema + (atr * atr_multiplier)
lower_band = ema - (atr * atr_multiplier)

// Entry Condition
bullish_entry = (close < ema) and 
               (close[1] <= lower_band[1]) and 
               (close > close[1])

// Variables for managing trade logic
var float entry_price = na
var float trail_price = na  // Declare trail_price
var float trail_stop = na
var bool trail_active = false

if bullish_entry
    entry_price := close
    trail_active := false
    trail_price := na  // Reset trail_price on a new entry

// Exit Conditions
trail_activation = close >= upper_band
trail_active := trail_active or trail_activation
trail_price := trail_active ? math.max(high, nz(trail_price[1], high)) : na
trail_stop := trail_active ? trail_price * (1 - trail_percent / 100) : na

// Exit strategy
strategy.exit("Upper Band TP", "Long", limit=upper_band, stop=trail_stop)

// Entry Execution
if bullish_entry
    strategy.entry("Long", strategy.long)

// Visuals
plot(ema, "EMA", color=color.new(#4A90E2, 0))
plot(upper_band, "Upper Band (TP)", color=color.orange)
plot(lower_band, "Lower Band", color=color.green)

// Entry/exit markers
plotshape(bullish_entry, style=shape.triangleup, location=location.belowbar, color=color.green, size=size.small)
plotshape(close >= upper_band, style=shape.triangledown, location=location.abovebar, color=color.red, size=size.small, title="Take Profit")