XAUUSD Scalping System [MACD + EMA + UT Bot + LinReg]

//version=5
indicator("XAUUSD Scalping System [MACD + EMA + UT Bot + LinReg]", overlay=true)

// === INPUTS ===
fastLen = input.int(8, title="MACD Fast Length")
slowLen = input.int(21, title="MACD Slow Length")
signalLen = input.int(5, title="MACD Signal Smoothing")
linregLen = input.int(14, title="Linear Regression Length")
emaLen = input.int(21, title="EMA Length")
atrPeriod = input.int(10, title="UT Bot ATR Period")
atrMultiplier = input.float(2.0, title="UT Bot ATR Multiplier")

// === EMA ===
ema = ta.ema(close, emaLen)
plot(ema, title="21 EMA", color=color.orange, linewidth=1)

// === MACD ===
macdLine = ta.ema(close, fastLen) - ta.ema(close, slowLen)
signalLine = ta.ema(macdLine, signalLen)
hist = macdLine - signalLine
macdBull = hist > 0 and hist > hist[1]
macdBear = hist < 0 and hist < hist[1]

// === Linear Regression ===
linreg = ta.linreg(close, linregLen, 0)
bullCandle = close > linreg
bearCandle = close < linreg

barcolor(bullCandle ? color.new(color.green, 40) : bearCandle ? color.new(color.red, 40) : na)

// === UT Bot ===
atr = ta.atr(atrPeriod)
upperBand = close + atr * atrMultiplier
lowerBand = close - atr * atrMultiplier

var float trend = na
trend := na(trend[1]) ? 1 : trend[1]
trend := close > upperBand ? 1 : close < lowerBand ? -1 : trend[1]

buyUT = ta.crossover(trend, 0)
sellUT = ta.crossunder(trend, 0)

// === ENTRY CONDITIONS ===
longCondition = buyUT and bullCandle and macdBull and close > ema
shortCondition = sellUT and bearCandle and macdBear and close < ema

plotshape(longCondition, title="BUY Signal", location=location.belowbar, color=color.green, style=shape.labelup, text="BUY", size=size.small)
plotshape(shortCondition, title="SELL Signal", location=location.abovebar, color=color.red, style=shape.labeldown, text="SELL", size=size.small)

bgcolor(longCondition ? color.new(color.green, 85) : shortCondition ? color.new(color.red, 85) : na, title="Signal Background")

// === Alerts ===
alertcondition(longCondition, title="BUY Alert", message="XAUUSD BUY setup triggered!")
alertcondition(shortCondition, title="SELL Alert", message="XAUUSD SELL setup triggered!")