//@version=5
strategy(title="3ATR EMA Basic", shorttitle="3ATR-Basic", 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")

// 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])

// Exit Condition (when price crosses upper band)
bullish_exit = close > upper_band

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

if bullish_exit
    strategy.close("Long")

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

plotshape(bullish_entry ? low : na, 
          style=shape.triangleup, 
          location=location.belowbar, 
          color=color.new(#00FF00, 0), 
          size=size.small,
          title="Bull Entry")

plotshape(bullish_exit ? high : na,
          style=shape.triangledown,
          location=location.abovebar,
          color=color.new(#FF0000, 0),
          size=size.small,
          title="Bull Exit")