ADX Trend Strength - Eterna

//@version=5
strategy("ADX Trend Strength - 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 ====================
adxLength = input.int(14, "ADX Length", minval=1)
adxThreshold = input.int(25, "ADX Threshold", minval=1)
diLength = input.int(14, "DI Length", minval=1)
emaLength = input.int(50, "Trend 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")

// ==================== ADX Calculation ====================
[diPlus, diMinus, adx] = ta.dmi(diLength, adxLength)
trendEMA = ta.ema(close, emaLength)

// ==================== Entry Conditions ====================
// Strong trend: ADX above threshold
strongTrend = adx > adxThreshold

// Bullish: DI+ crosses above DI- with strong ADX and price above EMA
bullishDI = ta.crossover(diPlus, diMinus)
longCondition = bullishDI and strongTrend and close > trendEMA

// Bearish: DI- crosses above DI+ with strong ADX and price below EMA
bearishDI = ta.crossover(diMinus, diPlus)
shortCondition = bearishDI and strongTrend and close < trendEMA

// Exit when DI crosses opposite or ADX drops below threshold
exitLong = ta.crossunder(diPlus, diMinus) or adx < adxThreshold * 0.7
exitShort = ta.crossover(diPlus, diMinus) or adx < adxThreshold * 0.7

// ==================== 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(trendEMA, "Trend EMA", color=color.orange, linewidth=2)

// Plot ADX in separate pane (will appear as overlay labels)
plotshape(longCondition, "Long Signal", shape.triangleup, location.belowbar, color.green, size=size.normal, 
          text="ADX:" + str.tostring(adx, "#.#"))
plotshape(shortCondition, "Short Signal", shape.triangledown, location.abovebar, color.red, size=size.normal,
          text="ADX:" + str.tostring(adx, "#.#"))

// Background color based on trend strength
bgcolor(strongTrend ? (diPlus > diMinus ? color.new(color.green, 92) : color.new(color.red, 92)) : color.new(color.gray, 95))

// Show DI crossovers
plotshape(bullishDI and strongTrend, "DI+ Cross", shape.circle, location.belowbar, color.new(color.green, 50), size=size.tiny)
plotshape(bearishDI and strongTrend, "DI- Cross", shape.circle, location.abovebar, color.new(color.red, 50), size=size.tiny)