Keltner Channel Trend - Eterna

//@version=5
strategy("Keltner Channel Trend - 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 ====================
emaLength = input.int(20, "EMA Length", minval=1)
atrLength = input.int(10, "ATR Length", minval=1)
atrMultiplier = input.float(2.0, "ATR Multiplier", minval=0.1, step=0.1)
trendFilter = input.int(50, "Trend Filter 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)

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

// ==================== Keltner Channel Calculation ====================
basis = ta.ema(close, emaLength)
atrValue = ta.atr(atrLength)
upperBand = basis + (atrValue * atrMultiplier)
lowerBand = basis - (atrValue * atrMultiplier)
trendEMA = ta.ema(close, trendFilter)

// ==================== Entry Conditions ====================
// Uptrend: Price above trend EMA
uptrend = close > trendEMA

// Long: Price bounces off lower band in uptrend
longBounce = ta.crossover(close, lowerBand) and low <= lowerBand
longCondition = uptrend and longBounce

// Downtrend: Price below trend EMA
downtrend = close < trendEMA

// Short: Price rejects from upper band in downtrend
shortReject = ta.crossunder(close, upperBand) and high >= upperBand
shortCondition = downtrend and shortReject

// Exit when price crosses middle (basis) or opposite band
exitLong = ta.crossunder(close, basis)
exitShort = ta.crossover(close, basis)

// ==================== 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 ====================
basisPlot = plot(basis, "Basis EMA", color=color.blue, linewidth=2)
upperPlot = plot(upperBand, "Upper Band", color=color.new(color.green, 0), linewidth=1)
lowerPlot = plot(lowerBand, "Lower Band", color=color.new(color.red, 0), linewidth=1)
plot(trendEMA, "Trend EMA", color=color.orange, linewidth=1)

// Fill channel
fill(upperPlot, lowerPlot, color=color.new(color.blue, 92))

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

// Background trend color
bgcolor(uptrend ? color.new(color.green, 96) : color.new(color.red, 96))