ScalpZone — EMA+RSI+ATR (Nifty/Sensex)

//version=5
indicator("ScalpZone — EMA+RSI+ATR (Nifty/Sensex)", overlay=true, shorttitle="ScalpZone v2")

// === Inputs ===
fastLen = input.int(9, title="Fast EMA", minval=1)
slowLen = input.int(21, title="Slow EMA", minval=1)
rsiLen = input.int(7, title="RSI Length", minval=1)
rsi_high = input.int(70, title="RSI Overbought")
rsi_low = input.int(35, title="RSI Oversold (for entries)")
atrLen = input.int(14, title="ATR Length")
atrMult = input.float(1.5, title="ATR Multiplier (trailing stop)")
useStrictPullback = input.bool(true, title="Require pullback candle (close < fast EMA) for entry")
showStops = input.bool(true, title="Show trailing stop line")
showEMAs = input.bool(true, title="Show EMAs")

// === Core indicators ===
emaFast = ta.ema(close, fastLen)
emaSlow = ta.ema(close, slowLen)
rsiVal = ta.rsi(close, rsiLen)
atr = ta.atr(atrLen)

// === Trend detection ===
bullTrend = emaFast > emaSlow
bearTrend = emaFast < emaSlow

// Pullback
pullback = close < emaFast

// Entry conditions
longCondition = bullTrend and (not useStrictPullback or pullback) and (rsiVal > rsi_low and rsiVal < rsi_high) and close > open and close > emaFast
shortCondition = bearTrend and (not useStrictPullback or not pullback) and (rsiVal < rsi_high and rsiVal > rsi_low) and close < open and close < emaFast

// === Trailing stops ===
var float longTrail = na
var float shortTrail = na

if (longCondition)
longTrail := close - atr * atrMult
else if not na(longTrail)
longTrail := math.max(longTrail, close - atr * atrMult)

if (shortCondition)
shortTrail := close + atr * atrMult
else if not na(shortTrail)
shortTrail := math.min(shortTrail, close + atr * atrMult)

// Exit signals
longExit = not na(longTrail) and close < longTrail
shortExit = not na(shortTrail) and close > shortTrail

// === Dynamic EMA colors ===
emaFastColor = emaFast > emaSlow ? color.green : color.red
emaSlowColor = color.orange

// === Plots ===
// Signals
plotshape(longCondition, title="Long Entry", location=location.belowbar, color=color.green, style=shape.triangleup, size=size.tiny, text="LONG")
plotshape(shortCondition, title="Short Entry", location=location.abovebar, color=color.red, style=shape.triangledown, size=size.tiny, text="SHORT")
plotshape(longExit, title="Long Exit", location=location.abovebar, color=color.orange, style=shape.xcross, size=size.tiny, text="EXIT")
plotshape(shortExit, title="Short Exit", location=location.belowbar, color=color.orange, style=shape.xcross, size=size.tiny, text="EXIT")

// EMAs (with visibility toggle)
plot(emaFast, title="EMA Fast", color=emaFastColor, linewidth=2,
display = showEMAs ? display.all : display.none)
plot(emaSlow, title="EMA Slow", color=emaSlowColor, linewidth=2,
display = showEMAs ? display.all : display.none)

// Trailing stops (with visibility toggle)
plot(longTrail, title="Long Trail", style=plot.style_linebr, linewidth=2, color=color.green,
display = showStops ? display.all : display.none)
plot(shortTrail, title="Short Trail", style=plot.style_linebr, linewidth=2, color=color.red,
display = showStops ? display.all : display.none)

// RSI (hidden panel — you can enable in Style menu)
plot(rsiVal, title="RSI", color=color.blue, display=display.none)
hline(rsi_high, "RSI High", color=color.gray, linestyle=hline.style_dotted)
hline(rsi_low, "RSI Low", color=color.gray, linestyle=hline.style_dotted)

// === Alerts ===
alertcondition(longCondition, title="ScalpZone Long", message="ScalpZone: LONG signal on {{ticker}} {{interval}} — Close: {{close}}")
alertcondition(shortCondition, title="ScalpZone Short", message="ScalpZone: SHORT signal on {{ticker}} {{interval}} — Close: {{close}}")
alertcondition(longExit, title="ScalpZone Long Exit", message="ScalpZone: EXIT LONG on {{ticker}} {{interval}} — Close: {{close}}")
alertcondition(shortExit, title="ScalpZone Short Exit", message="ScalpZone: EXIT SHORT on {{ticker}} {{interval}} — Close: {{close}}")