//@version=5
strategy(title="3ATR EMA + Risk Mgmt", shorttitle="3ATR-RM", 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")
risk_percent = input.float(1.0, "Risk %", step=0.1) // 1% risk per trade
max_stop_pct = input.float(7.0, "Max Stop %", step=0.1) // 7% max price 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 Conditions
bullish_entry = (close < ema) and 
               (close[1] <= lower_band[1]) and 
               (close > close[1])

// Risk Management Variables
var float entry_price = na
var float initial_stop = na
var float max_stop_price = na
var float trail_price = na
var bool trail_active = false

// Risk-based Position Sizing
position_size() =>
    equity = strategy.calc_equity(close)
    risk_amount = equity * (risk_percent / 100)
    price_risk = entry_price * (max_stop_pct / 100)
    strategy.equity / close // Comment: Temporary placeholder for calculation
    (risk_amount / price_risk) // Final position size calculation

// Trade Execution
if bullish_entry
    entry_price := close
    initial_stop := close * (1 - max_stop_pct/100)
    max_stop_price := initial_stop
    trail_price := na
    trail_active := false
    strategy.entry("Long", strategy.long, qty=position_size())

// Stop Management
if strategy.position_size > 0
    // Update trailing stop
    trail_price := math.max(high, nz(trail_price, high))
    trail_stop = trail_price * 0.98 // 2% trailing
    
    // Active stop is best of: initial 7% stop OR current trailing stop
    current_stop = math.max(max_stop_price, trail_stop)
    
    strategy.exit("Stop Exit", "Long", stop=current_stop)
    
    // Plot stops
    plot(current_stop, "Active Stop", color=color.red, style=plot.style_linebr)
    plot(max_stop_price, "Max Stop", color=color.gray, style=plot.style_circles)

// 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 Signal")