Donchian Channel Breakout - Eterna

//@version=5
strategy("Donchian Channel Breakout - Eterna", 
         overlay=true, 
         initial_capital=10000,
         default_qty_type=strategy.percent_of_equity, 
         default_qty_value=10,
         commission_type=strategy.commission.percent,
         commission_value=0.075)

// ==================== Parameters ====================
channelLength = input.int(20, "Channel Length", minval=1)
breakoutConfirm = input.int(1, "Breakout Confirmation Bars", minval=0, maxval=5)
useMiddleLine = input.bool(true, "Exit at Middle Line")
leverage = input.int(5, "Leverage", minval=1, maxval=100)
positionSize = input.float(0.01, "Position Size", minval=0.001, step=0.001)

webhookMessage = input.string('{"action":"{{strategy.order.action}}", "symbol":"{{ticker}}", "size":' + str.tostring(positionSize) + ', "leverage":' + str.tostring(leverage) + '}', 
                               "Webhook JSON", group="Webhook")

// ==================== Donchian Channel Calculation ====================
upperBand = ta.highest(high, channelLength)
lowerBand = ta.lowest(low, channelLength)
middleLine = (upperBand + lowerBand) / 2

// ==================== Entry Conditions ====================
// Breakout above upper band
longBreakout = close > upperBand[breakoutConfirm]
longCondition = longBreakout and not longBreakout[1]

// Breakdown below lower band
shortBreakout = close < lowerBand[breakoutConfirm]
shortCondition = shortBreakout and not shortBreakout[1]

// Exit conditions
exitLong = useMiddleLine ? ta.crossunder(close, middleLine) : ta.crossunder(close, lowerBand)
exitShort = useMiddleLine ? ta.crossover(close, middleLine) : ta.crossover(close, upperBand)

// ==================== Strategy Execution ====================
if longCondition
    strategy.entry("Long", strategy.long, alert_message=str.replace(webhookMessage, "{{strategy.order.action}}", "buy"))

if shortCondition
    strategy.entry("Short", strategy.short, alert_message=str.replace(webhookMessage, "{{strategy.order.action}}", "sell"))

if exitLong
    strategy.close("Long", alert_message='{"action":"close", "symbol":"{{ticker}}"}')

if exitShort
    strategy.close("Short", alert_message='{"action":"close", "symbol":"{{ticker}}"}')

// ==================== Plotting ====================
upperPlot = plot(upperBand, "Upper Band", color=color.green, linewidth=2)
lowerPlot = plot(lowerBand, "Lower Band", color=color.red, linewidth=2)
plot(middleLine, "Middle Line", color=color.blue, linewidth=1, style=plot.style_circles)

// Fill channel
fill(upperPlot, lowerPlot, color=color.new(color.blue, 95))

// Entry signals
plotshape(longCondition, "Long Breakout", shape.triangleup, location.belowbar, color.green, size=size.normal)
plotshape(shortCondition, "Short Breakdown", shape.triangledown, location.abovebar, color.red, size=size.normal)

// Highlight breakout zones
bgcolor(close > upperBand ? color.new(color.green, 90) : close < lowerBand ? color.new(color.red, 90) : na)