EMA Ribbon (9/21/55) - Eterna

//@version=5
strategy("EMA Ribbon (9/21/55) - 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 ====================
emaFast = input.int(9, "Fast EMA", minval=1)
emaMid = input.int(21, "Mid EMA", minval=1)
emaSlow = input.int(55, "Slow EMA", minval=1)
leverage = input.int(5, "Leverage", minval=1, maxval=100)
positionSize = input.float(0.01, "Position Size", minval=0.001, step=0.001)

// Eterna Webhook Settings
enableWebhook = input.bool(true, "Enable Webhook Alerts", group="Webhook")
webhookMessage = input.string('{"action":"{{strategy.order.action}}", "symbol":"{{ticker}}", "size":' + str.tostring(positionSize) + ', "leverage":' + str.tostring(leverage) + '}', 
                               "Webhook JSON", 
                               group="Webhook")

// ==================== Indicators ====================
ema9 = ta.ema(close, emaFast)
ema21 = ta.ema(close, emaMid)
ema55 = ta.ema(close, emaSlow)

// ==================== Entry Conditions ====================
// Bullish: All EMAs aligned (9 > 21 > 55) and price crosses above fast EMA
bullishAlignment = ema9 > ema21 and ema21 > ema55
longCondition = bullishAlignment and ta.crossover(close, ema9)

// Bearish: All EMAs aligned (9 < 21 < 55) and price crosses below fast EMA
bearishAlignment = ema9 < ema21 and ema21 < ema55
shortCondition = bearishAlignment and ta.crossunder(close, ema9)

// Exit when alignment breaks
exitLong = ta.crossunder(ema9, ema21)
exitShort = ta.crossover(ema9, ema21)

// ==================== 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 ====================
plot(ema9, "EMA 9", color=color.new(color.green, 0), linewidth=2)
plot(ema21, "EMA 21", color=color.new(color.orange, 0), linewidth=2)
plot(ema55, "EMA 55", color=color.new(color.red, 0), linewidth=2)

plotshape(longCondition, "Long", shape.triangleup, location.belowbar, color.green, size=size.small)
plotshape(shortCondition, "Short", shape.triangledown, location.abovebar, color.red, size=size.small)

// Ribbon coloring
bgcolor(bullishAlignment ? color.new(color.green, 95) : bearishAlignment ? color.new(color.red, 95) : na)