SMC Entry Filter

//@version=5
indicator("SMC Entry Filter", overlay=true, max_boxes_count=50, max_lines_count=50)

// ICT / SMC research overlay: swings, BOS, FVG, hug-zone filter near key liquidity.
// Not a signal service. Use on liquid futures (ES / NQ 5m typical).

swingLen        = input.int(5, "Swing lookback", minval=2, maxval=20)
atrLen          = input.int(14, "ATR length")
fvgAtrFrac      = input.float(0.15, "Min FVG size (ATR)", minval=0.01, step=0.05)
hugAtrFrac      = input.float(0.25, "Hug zone (ATR) — skip entries this close to the broken level", minval=0.05, step=0.05)
dispAtrFrac     = input.float(0.35, "Displacement body (ATR)", minval=0.05, step=0.05)
nySessionOnly   = input.bool(true, "NY session only (09:30-16:00 ET)")
showFvg         = input.bool(true, "Draw FVG boxes")

atr = ta.atr(atrLen)

ph = ta.pivothigh(high, swingLen, swingLen)
pl = ta.pivotlow(low, swingLen, swingLen)

var float lastSwingHigh = na
var float lastSwingLow  = na
if not na(ph)
    lastSwingHigh := ph
if not na(pl)
    lastSwingLow := pl

inNy = not nySessionOnly or not na(time(timeframe.period, "0930-1600", "America/New_York"))

bullFvg = low > high[2] and (low - high[2]) >= atr * fvgAtrFrac
bearFvg = high < low[2] and (low[2] - high) >= atr * fvgAtrFrac

plotshape(showFvg and bullFvg, title="Bull FVG", style=shape.triangleup, location=location.belowbar, size=size.tiny, color=color.new(color.teal, 0))
plotshape(showFvg and bearFvg, title="Bear FVG", style=shape.triangledown, location=location.abovebar, size=size.tiny, color=color.new(color.maroon, 0))

bosUp = not na(lastSwingHigh) and close > lastSwingHigh and close[1] <= lastSwingHigh
bosDn = not na(lastSwingLow) and close < lastSwingLow and close[1] >= lastSwingLow

body = math.abs(close - open)
displaced = body >= atr * dispAtrFrac

hugHigh = not na(lastSwingHigh) and math.abs(close - lastSwingHigh) <= atr * hugAtrFrac
hugLow  = not na(lastSwingLow) and math.abs(close - lastSwingLow) <= atr * hugAtrFrac

longOk  = inNy and bosUp and close > open and displaced and not hugHigh
shortOk = inNy and bosDn and close < open and displaced and not hugLow

plot(lastSwingHigh, "Liquidity high", color=color.new(color.red, 40), style=plot.style_linebr)
plot(lastSwingLow, "Liquidity low", color=color.new(color.green, 40), style=plot.style_linebr)

plotshape(bosUp, "Raw BOS up", style=shape.circle, location=location.belowbar, size=size.tiny, color=color.new(color.gray, 30))
plotshape(bosDn, "Raw BOS down", style=shape.circle, location=location.abovebar, size=size.tiny, color=color.new(color.gray, 30))

plotshape(longOk, "Filtered long", style=shape.labelup, location=location.belowbar, text="L", size=size.small, color=color.new(color.teal, 0), textcolor=color.white)
plotshape(shortOk, "Filtered short", style=shape.labeldown, location=location.abovebar, text="S", size=size.small, color=color.new(color.maroon, 0), textcolor=color.white)

alertcondition(longOk, "SMC filtered long", "Filtered long: BOS up, displacement, not hugging liquidity high")
alertcondition(shortOk, "SMC filtered short", "Filtered short: BOS down, displacement, not hugging liquidity low")