Donchian Breakout + ATR Risk

//@version=5
strategy("Donchian Breakout + ATR Risk (Robust Trend) [v5]", overlay=true,
     initial_capital=10000, pyramiding=0, calc_on_every_tick=true,
     commission_type=strategy.commission.percent, commission_value=0.02)


// Inputs

dcLen        = input.int(55, "Donchian Length", minval=5)
emaLen       = input.int(200, "EMA Filter Length", minval=1)
useEMAFilter = input.bool(true, "Use EMA Trend Filter")

atrLen       = input.int(14, "ATR Length", minval=1)
atrBaseLen   = input.int(50, "ATR Baseline Length", minval=5)
atrMult      = input.float(1.0, "ATR Regime Filter (>=)", step=0.05)

riskATR      = input.float(2.0, "Stop (ATR)", step=0.1)
trailATR     = input.float(2.5, "Trailing (ATR)", step=0.1)
useTrail     = input.bool(true, "Use Trailing Stop")

takeMode     = input.string("TrailOnly", "Take Profit Mode", options=["TrailOnly","RR_Target"])
rr           = input.float(2.0, "RR Target (if RR_Target)", step=0.1)

// Indicators

upper = ta.highest(high, dcLen)
lower = ta.lowest(low, dcLen)
mid   = (upper + lower) / 2.0

ema   = ta.ema(close, emaLen)

atr = ta.atr(atrLen)
atrBase = ta.sma(atr, atrBaseLen)
regimeOk = atr >= atrBase * atrMult

trendUp   = close > ema
trendDown = close < ema

// Breakout signals (use previous channel to avoid repaint-like behavior)
longBreak  = close > upper[1]
shortBreak = close < lower[1]

longAllowed  = regimeOk and (not useEMAFilter or trendUp)
shortAllowed = regimeOk and (not useEMAFilter or trendDown)

//Entries

if longBreak and longAllowed and strategy.position_size <= 0
    strategy.entry("LONG", strategy.long)

if shortBreak and shortAllowed and strategy.position_size >= 0
    strategy.entry("SHORT", strategy.short)

// Exits

if strategy.position_size > 0
    ep = strategy.position_avg_price
    stopL = ep - atr * riskATR
    if useTrail
        strategy.exit("L-EXIT", "LONG", stop=stopL, trail_points=atr * trailATR)
    else if takeMode == "RR_Target"
        takeL = ep + (ep - stopL) * rr
        strategy.exit("L-EXIT", "LONG", stop=stopL, limit=takeL)
    else
        strategy.exit("L-EXIT", "LONG", stop=stopL)

if strategy.position_size < 0
    ep = strategy.position_avg_price
    stopS = ep + atr * riskATR
    if useTrail
        strategy.exit("S-EXIT", "SHORT", stop=stopS, trail_points=atr * trailATR)
    else if takeMode == "RR_Target"
        takeS = ep - (stopS - ep) * rr
        strategy.exit("S-EXIT", "SHORT", stop=stopS, limit=takeS)
    else
        strategy.exit("S-EXIT", "SHORT", stop=stopS)

plot(upper, "Donchian Upper")
plot(lower, "Donchian Lower")
plot(mid,   "Donchian Mid")
plot(ema,   "EMA Filter")