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//version=5
indicator("Market Structure BOS/CHoCH", overlay=true, max_labels_count=500)

// === Settings ===
swingLen = input.int(3, "Swing Length", minval=1)
showBOS = input.bool(true, "Show BOS")
showCHoCH = input.bool(true, "Show CHoCH")

// === Identify swing highs and lows ===
var float lastHigh = na
var float lastLow = na

swingHigh = ta.pivothigh(high, swingLen, swingLen)
swingLow = ta.pivotlow(low, swingLen, swingLen)

if not na(swingHigh)
lastHigh := swingHigh
if not na(swingLow)
lastLow := swingLow

// === Determine HH, HL, LH, LL ===
hh = not na(swingHigh) and swingHigh > lastHigh
hl = not na(swingLow) and swingLow > lastLow
lh = not na(swingHigh) and swingHigh < lastHigh
ll = not na(swingLow) and swingLow < lastLow

// === Plot labels for structure points ===
if hh
label.new(bar_index, swingHigh, "HH", style=label.style_label_down, color=color.green, textcolor=color.white, yloc=yloc.abovebar)
if hl
label.new(bar_index, swingLow, "HL", style=label.style_label_up, color=color.green, textcolor=color.white, yloc=yloc.belowbar)
if lh
label.new(bar_index, swingHigh, "LH", style=label.style_label_down, color=color.red, textcolor=color.white, yloc=yloc.abovebar)
if ll
label.new(bar_index, swingLow, "LL", style=label.style_label_up, color=color.red, textcolor=color.white, yloc=yloc.belowbar)

// === BOS (Break of Structure) detection ===
bosUp = ta.crossover(close, lastHigh)
bosDown = ta.crossunder(close, lastLow)

if showBOS and bosUp
label.new(bar_index, high, "BOS ↑", style=label.style_label_down, color=color.blue, textcolor=color.white, yloc=yloc.abovebar)
if showBOS and bosDown
label.new(bar_index, low, "BOS ↓", style=label.style_label_up, color=color.blue, textcolor=color.white, yloc=yloc.belowbar)

// === CHoCH (Change of Character) detection ===
var int trend = 0 // 1 = uptrend, -1 = downtrend

if hh or hl
trend := 1
if lh or ll
trend := -1

chochUp = trend == -1 and bosUp
chochDown = trend == 1 and bosDown

if showCHoCH and chochUp
label.new(bar_index, high, "CHoCH ↑", style=label.style_label_down, color=color.lime, textcolor=color.white, yloc=yloc.abovebar)
if showCHoCH and chochDown
label.new(bar_index, low, "CHoCH ↓", style=label.style_label_up, color=color.lime, textcolor=color.white, yloc=yloc.belowbar)

// === Arrows for signals ===
plotshape(bosUp, title="BOS Buy Arrow", location=location.belowbar, color=color.blue, style=shape.labelup, size=size.small, text="↑ BOS")
plotshape(bosDown, title="BOS Sell Arrow", location=location.abovebar, color=color.blue, style=shape.labeldown, size=size.small, text="↓ BOS")
plotshape(chochUp, title="CHoCH Buy Arrow", location=location.belowbar, color=color.lime, style=shape.labelup, size=size.small, text="↑ CHoCH")
plotshape(chochDown, title="CHoCH Sell Arrow", location=location.abovebar, color=color.lime, style=shape.labeldown, size=size.small, text="↓ CHoCH")