Custom Trading Strategy

/@version=5
indicator("Custom Trading Strategy", overlay=true)

// ADX calculation
adxFunc(src, length) =>
    up = ta.change(high)
    down = -ta.change(low)
    plusDM = na(up) ? na : (up > down and up > 0 ? up : 0)
    minusDM = na(down) ? na : (down > up and down > 0 ? down : 0)
    tr = ta.rma(ta.tr(true), length)
    plusDI = 100 * ta.rma(plusDM, length) / tr
    minusDI = 100 * ta.rma(minusDM, length) / tr
    dx = 100 * math.abs(plusDI - minusDI) / (plusDI + minusDI)
    ta.rma(dx, length)

adx = adxFunc(close, 14)

// RSI
rsi = ta.rsi(close, 14)

// MACD
[macdLine, signalLine, _] = ta.macd(close, 12, 26, 9)

// Fibonacci Retracement Levels
highLevel = ta.highest(high, 100)
lowLevel = ta.lowest(low, 100)
fibLevel = highLevel - (highLevel - lowLevel) * 0.618

// Heikin-Ashi
haClose = (open + high + low + close) / 4
var float haOpen = na
haOpen := na(haOpen[1]) ? (open + close) / 2 : (haOpen[1] + haClose[1]) / 2
haHigh = math.max(high, math.max(haOpen, haClose))
haLow = math.min(low, math.min(haOpen, haClose))
heikinAshiGreen = haClose > haOpen
heikinAshiRed = haClose < haOpen

// Buy and Sell Conditions
adxBuyCondition = adx > 25
rsiBuyCondition = rsi < 30
rsiSellCondition = rsi > 70
macdBuyCondition = ta.crossover(macdLine, signalLine)
macdSellCondition = ta.crossunder(macdLine, signalLine)
fibBuyCondition = close <= fibLevel
fibSellCondition = close >= fibLevel

// Plot MACD conditions with updated labels
plotshape(series=macdBuyCondition, location=location.belowbar, color=color.green, style=shape.labelup, text="KESİN AL")
plotshape(series=macdSellCondition, location=location.abovebar, color=color.red, style=shape.labeldown, text="KESİN SAT")
plot(fibLevel, title="Fibonacci Level", color=color.purple)

// Combined Signal Line
var float signalLineValue = na
signalLineValue := adxBuyCondition and rsiBuyCondition and macdBuyCondition and fibBuyCondition and heikinAshiGreen ? 1 : (adxBuyCondition and rsiSellCondition and macdSellCondition and fibSellCondition and heikinAshiRed ? -1 : 0)

// Plot the Signal Line
plot(signalLineValue, title="Signal Line", color=color.blue, linewidth=2)

// Buy and Sell Signals Based on the Signal Line
plotshape(series=signalLineValue == 1, location=location.belowbar, color=color.green, style=shape.labelup, text="BUY")
plotshape(series=signalLineValue == -1, location=location.abovebar, color=color.red, style=shape.labeldown, text="SELL")