Liquidity Sweep + Close-Back Confirmation

// This Pine Script™ code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Ahmed - Quant-Edge Indicators
//@version=6
indicator("Liquidity Sweep + Close-Back Confirmation", overlay = true, max_boxes_count = 50, max_labels_count = 50)

// ==== Inputs ====
swingLookback = input.int(10, "Swing Lookback (bars)", minval = 2)
showBoxes     = input.bool(true, "Show sweep boxes")
showLabels    = input.bool(true, "Show Buy/Sell labels")
buyColor      = input.color(color.new(color.teal, 70), "Buy box color")
sellColor     = input.color(color.new(color.red, 80), "Sell box color")

// ==== Pattern detection ====
// confirmation candle = current bar (bar_index), sweep candle = 1 bar back
sweepLow   = low[1]
sweepHigh  = high[1]

// swing reference BEFORE the sweep candle: lowest low / highest high over the lookback window, starting 2 bars back
swingLow  = ta.lowest(low, swingLookback)[2]
swingHigh = ta.highest(high, swingLookback)[2]

bullSignal = sweepLow < swingLow and close > sweepHigh
bearSignal = sweepHigh > swingHigh and close < sweepLow

// ==== Plot arrows ====
plotshape(bullSignal, title = "Buy Signal", style = shape.triangleup,
     location = location.belowbar, color = color.teal, size = size.small)
plotshape(bearSignal, title = "Sell Signal", style = shape.triangledown,
     location = location.abovebar, color = color.red, size = size.small)

// ==== Boxes over the sweep candle ====
if showBoxes and bullSignal
    box.new(bar_index[1], sweepHigh, bar_index, sweepLow,
         border_color = color.teal, bgcolor = buyColor, border_width = 1)

if showBoxes and bearSignal
    box.new(bar_index[1], sweepHigh, bar_index, sweepLow,
         border_color = color.red, bgcolor = sellColor, border_width = 1)

// ==== Labels ====
if showLabels and bullSignal
    label.new(bar_index, low, "BUY", style = label.style_label_up,
         color = color.teal, textcolor = color.white, size = size.small, yloc = yloc.belowbar)

if showLabels and bearSignal
    label.new(bar_index, high, "SELL", style = label.style_label_down,
         color = color.red, textcolor = color.white, size = size.small, yloc = yloc.abovebar)

// ==== Alerts ====
alertcondition(bullSignal, title = "Liquidity Sweep Buy", message = "{{ticker}} {{interval}}: Liquidity sweep BUY confirmed at {{close}}")
alertcondition(bearSignal, title = "Liquidity Sweep Sell", message = "{{ticker}} {{interval}}: Liquidity sweep SELL confirmed at {{close}}")