Get Double top and double bottom chart patterns Code That Actually Works

//@version=5
indicator("Double Top & Double Bottom Detector", shorttitle="DT/DB", overlay=true)

// Input parameters
pivotLen = input.int(5, "Pivot Length", minval=1)
tolPct = input.float(1.0, "Price Tolerance %", minval=0.1, maxval=5.0) / 100
troughConfirm = input.int(3, "Trough/Peak Confirmation Bars", minval=1)
maxBarsBetween = input.int(20, "Max Bars Between Pivots", minval=5, maxval=50)
showLabels = input.bool(true, "Show Pattern Labels")

// Detect pivot highs and lows
topPivot = ta.pivothigh(high, pivotLen, pivotLen)
botPivot = ta.pivotlow(low, pivotLen, pivotLen)

// Variables to track last two pivots
var float lastTop = na
var float prevTop = na
var int lastTopBar = na
var int prevTopBar = na

var float lastBot = na
var float prevBot = na
var int lastBotBar = na
var int prevBotBar = na

// Update top pivots
if not na(topPivot)
    prevTop := lastTop
    prevTopBar := lastTopBar
    lastTop := topPivot
    lastTopBar := bar_index[pivotLen]

// Update bottom pivots
if not na(botPivot)
    prevBot := lastBot
    prevBotBar := lastBotBar
    lastBot := botPivot
    lastBotBar := bar_index[pivotLen]

// Double Top Detection: Two tops within tolerance, trough in between lower than both
isDoubleTop = false
doubleTopNeck = na
if not na(prevTop) and not na(lastTop) and bar_index - prevTopBar <= maxBarsBetween
    tolHigh = math.min(prevTop, lastTop) * (1 + tolPct)
    tolLow = math.max(prevTop, lastTop) * (1 - tolPct)
    if lastTop <= tolHigh and lastTop >= tolLow
        troughLow = ta.lowest(low, bar_index - prevTopBar)
        if troughLow < math.min(prevTop, lastTop)
            isDoubleTop := true
            doubleTopNeck := troughLow

// Double Bottom Detection: Two bottoms within tolerance, peak in between higher than both
isDoubleBot = false
doubleBotNeck = na
if not na(prevBot) and not na(lastBot) and bar_index - prevBotBar <= maxBarsBetween
    tolLow = math.max(prevBot, lastBot) * (1 - tolPct)
    tolHigh = math.min(prevBot, lastBot) * (1 + tolPct)
    if lastBot >= tolLow and lastBot <= tolHigh
        peakHigh = ta.highest(high, bar_index - prevBotBar)
        if peakHigh > math.max(prevBot, lastBot)
            isDoubleBot := true
            doubleBotNeck := peakHigh

// Plot patterns
plotshape(isDoubleTop, "Double Top", shape.triangledown, location.abovebar, color.red, size=size.normal)
plotshape(isDoubleBot, "Double Bottom", shape.triangleup, location.belowbar, color.green, size=size.normal)

// Neckline plots (extend right for confirmation)
var line neckLineTop = na
var line neckLineBot = na
if isDoubleTop
    line.delete(neckLineTop)
    neckLineTop := line.new(prevTopBar, doubleTopNeck, bar_index + 10, doubleTopNeck, color.red, width=2, style=line.style_dashed)
if isDoubleBot
    line.delete(neckLineBot)
    neckLineBot := line.new(prevBotBar, doubleBotNeck, bar_index + 10, doubleBotNeck, color.green, width=2, style=line.style_dashed)

// Labels
if showLabels and isDoubleTop
    label.new(bar_index, high, "DT", style=label.style_label_down, color=color.red, textcolor=color.white)
if showLabels and isDoubleBot
    label.new(bar_index, low, "DB", style=label.style_label_up, color=color.green, textcolor=color.white)

// Alerts: Break of neckline for confirmation
neckBreakBear = isDoubleTop[troughConfirm] and close < doubleTopNeck[troughConfirm]
neckBreakBull = isDoubleBot[troughConfirm] and close > doubleBotNeck[troughConfirm]
alertcondition(neckBreakBear, "Double Top Breakdown", "Double Top confirmed: Price broke neckline!")
alertcondition(neckBreakBull, "Double Bottom Breakout", "Double Bottom confirmed: Price broke neckline!")