//@version=5
strategy("LuxAlgo-Style Scalper [GPT-5]",
     overlay=true,
     margin_long=100,
     margin_short=100,
     default_qty_type=strategy.percent_of_equity,
     default_qty_value=1,
     pyramiding=10,
     process_orders_on_close=true)

// === INPUTS ===
smaPeriod     = input.int(21, "SMA Period")
stochLen      = input.int(14, "Stoch RSI Length")
stochSmoothK  = input.int(3, "Stoch RSI %K Smoothing")
stochSmoothD  = input.int(3, "Stoch RSI %D Smoothing")
overbought    = input.int(80, "Overbought level")
oversold      = input.int(20, "Oversold level")
pivotLen      = input.int(5, "Swing detection sensitivity")
tp_pips       = input.float(10, "Take Profit (pips)", step=0.1)
sl_pips       = input.float(20, "Stop Loss (pips)", step=0.1)
allowHedge    = input.bool(true, "Allow Buy & Sell at same time?")
useSMAFilter  = input.bool(true, "Use SMA Direction Filter?")

// === CALCULATIONS ===

// 21 SMA
sma21 = ta.sma(close, smaPeriod)
plot(sma21, color=color.orange, title="21 SMA")

// Stochastic RSI
rsi = ta.rsi(close, stochLen)
k = ta.sma(ta.stoch(rsi, rsi, rsi, stochLen), stochSmoothK)
d = ta.sma(k, stochSmoothD)

isOverbought = (k > overbought and d > overbought)
isOversold   = (k < oversold and d < oversold)

// LuxAlgo-style swing highs/lows (replicated)
swingHigh = ta.pivothigh(high, pivotLen, pivotLen)
swingLow  = ta.pivotlow(low,  pivotLen, pivotLen)

plotshape(not na(swingHigh), title="Swing High", style=shape.triangledown, color=color.red, size=size.tiny, location=location.abovebar)
plotshape(not na(swingLow), title="Swing Low", style=shape.triangleup, color=color.green, size=size.tiny, location=location.belowbar)

// Get last swing type: 1 = low, -1 = high
var int lastSwing = 0
if not na(swingHigh)
    lastSwing := -1
if not na(swingLow)

    lastSwing := 1

// Price direction
priceAbove = close > sma21
priceBelow = close < sma21

// pip conversion
pip = syminfo.mintick * 10
tp = tp_pips * pip
sl = sl_pips * pip

// === TRADING LOGIC ===

// BUY when StochRSI oversold + recent swing low + (above SMA)
if isOversold and (lastSwing == 1) and (not useSMAFilter or priceAbove)
    strategy.entry("Buy", strategy.long)
    strategy.exit("Buy Exit", "Buy", limit=close + tp, stop=close - sl)
    alert("BUY signal — StochRSI oversold + Swing Low + Above SMA", alert.freq_once_per_bar)

// SELL when StochRSI overbought + recent swing high + (below SMA)
if isOverbought and (lastSwing == -1) and (not useSMAFilter or priceBelow)
    strategy.entry("Sell", strategy.short)
    strategy.exit("Sell Exit", "Sell", limit=close - tp, stop=close + sl)
    alert("SELL signal — StochRSI overbought + Swing High + Below SMA", alert.freq_once_per_bar)

// Optional hedging (neutral zone)
if allowHedge and not (isOversold or isOverbought)
    if (not useSMAFilter or priceAbove)
        strategy.entry("Buy-Hedge", strategy.long)
        strategy.exit("Buy-Hedge Exit", "Buy-Hedge", limit=close + tp, stop=close - sl)
    if (not useSMAFilter or priceBelow)
        strategy.entry("Sell-Hedge", strategy.short)
        strategy.exit("Sell-Hedge Exit", "Sell-Hedge", limit=close - tp, stop=close + sl)

// === VISUALS ===
hline(overbought, "Overbought", color=color.red, linestyle=hline.style_dotted)
hline(oversold, "Oversold", color=color.green, linestyle=hline.style_dotted)
bgcolor(isOversold ? color.new(color.green,85) : isOverbought ? color.new(color.red,85) : na)