Pro SMC Fair Value Gap (FVG) Indicator

//@version=5
indicator("🔥 Pro SMC Fair Value Gap (FVG) Indicator", overlay=true)

// === INPUTS === //
showBullishFVG = input.bool(true, "Show Bullish FVG")
showBearishFVG = input.bool(true, "Show Bearish FVG")
bullColor = input.color(color.new(color.green, 60), "Bullish FVG Fill")
bearColor = input.color(color.new(color.red, 60), "Bearish FVG Fill")
bullBorder = input.color(color.green, "Bullish FVG Border")
bearBorder = input.color(color.red, "Bearish FVG Border")
labelSize = input.string("small", "Label Size", options=["tiny", "small", "normal", "large", "huge"])
maxBoxes = input.int(100, "Max Boxes on Chart")
useStrongDisplacement = input.bool(true, "Use Displacement Filter (ATR-based)")
displacementMultiplier = input.float(1.5, "Displacement Strength", step=0.1)

// === CONDITIONS === //
body = math.abs(close - open)
displacement = body > ta.atr(14) * displacementMultiplier

isBullishFVG = low > high[2]
isBearishFVG = high < low[2]

validBullFVG = isBullishFVG and (not useStrongDisplacement or displacement)
validBearFVG = isBearishFVG and (not useStrongDisplacement or displacement)

// === STORAGE === //
var box[] fvgBoxes = array.new_box()
var label[] fvgLabels = array.new_label()

// === DRAWING === //
if showBullishFVG and validBullFVG
    b = box.new(left=bar_index[2], right=bar_index, top=low, bottom=high[2], bgcolor=bullColor, border_color=bullBorder)
    l = label.new(x=bar_index, y=low, text="Bullish FVG", style=label.style_label_up, textcolor=color.white, size=labelSize, color=color.green)
    array.push(fvgBoxes, b)
    array.push(fvgLabels, l)

if showBearishFVG and validBearFVG
    b = box.new(left=bar_index[2], right=bar_index, top=high[2], bottom=low, bgcolor=bearColor, border_color=bearBorder)
    l = label.new(x=bar_index, y=high, text="Bearish FVG", style=label.style_label_down, textcolor=color.white, size=labelSize, color=color.red)
    array.push(fvgBoxes, b)
    array.push(fvgLabels, l)

// === AUTO DELETE OLD OBJECTS === //
if array.size(fvgBoxes) > maxBoxes
    oldBox = array.shift(fvgBoxes)
    box.delete(oldBox)

if array.size(fvgLabels) > maxBoxes
    oldLabel = array.shift(fvgLabels)
    label.delete(oldLabel)

// === ALERTS === //
alertcondition(validBullFVG, title="Bullish FVG Detected", message="Bullish Fair Value Gap formed!")
alertcondition(validBearFVG, title="Bearish FVG Detected", message="Bearish Fair Value Gap formed!")