Capital41 Session Flow Simple v2

// Copyright (c) 2026 Capital41 | MIT License
// CAPITAL41 SESSION FLOW SIMPLE v2

// What it does:
// - Draws session boxes for Asia, London, and New York using a US timezone.
// - Tracks each session high/low and optional open line.
// - Optional breakout markers when price breaks the prior session range.
//
// v2 changes:
// - FIXED: Breakout markers and alerts gated by barstate.isconfirmed, so they
//          print on bar close rather than the moment price ticks through the
//          prior session level.
//
// TradingView setup:
// 1) Open TradingView -> Pine Editor.
// 2) Paste this script, Save, and Add to chart.
// 3) Use 30m or 4h on BTC or US stocks.
// 4) If you trade futures, set chart session to "All Sessions" to see Asia/London.
// 5) Confirm the session timezone (default America/New_York).
//
// Usage guide (30m/4h):
// - Keep boxes on for context; turn on breakouts only if you trade them.
// - For US stocks, focus on New York session and pre-market London context.
// - For BTC, all sessions are active; boxes help identify liquidity windows.



//@version=6
indicator("Capital41 Session Flow Simple v2", overlay = true, max_boxes_count = 300, max_labels_count = 50,max_lines_count = 50)

// Inputs
useExchangeTz = input.bool(false, "Use exchange timezone")
sessTz     = input.string("America/New_York", "Session timezone",
                          options = ["America/New_York", "America/Chicago", "Etc/UTC", "Europe/London", "Asia/Tokyo"])
sessAsia   = input.session("0000-0800", "Asia session")
sessLondon = input.session("0800-1600", "London session")
sessNY     = input.session("0930-1600", "New York session")

showBoxes    = input.bool(true, "Show session boxes")
showOpenLine = input.bool(false, "Show session open")
showBreakout = input.bool(false, "Show breakouts")
showLabels   = input.bool(false, "Show session range label")

colorAsia   = color.new(color.teal,  88)
colorLondon = color.new(color.orange,88)
colorNY     = color.new(color.blue,  88)
colorBull   = color.new(color.lime, 0)
colorBear   = color.new(color.red, 0)

// Session detection
inAsia   = useExchangeTz ? not na(time(timeframe.period, sessAsia)) : not na(time(timeframe.period, sessAsia, sessTz))
inLondon = useExchangeTz ? not na(time(timeframe.period, sessLondon)) : not na(time(timeframe.period, sessLondon, sessTz))
inNY     = useExchangeTz ? not na(time(timeframe.period, sessNY)) : not na(time(timeframe.period, sessNY, sessTz))

sessionId = inAsia ? 1 : inLondon ? 2 : inNY ? 3 : 0

var int   prevSessionId = 0
var float sessHigh      = na
var float sessLow       = na
var float sessOpen      = na
var float sessClose     = na
var float prevRange     = na
var float prevSessHigh  = na
var float prevSessLow   = na
var box   sessBox       = na
var line  openLine      = na


isSessionChange = sessionId != prevSessionId
if isSessionChange
    // Close previous session
    if prevSessionId != 0
        if not na(sessBox)
            box.set_right(sessBox, bar_index)
        if not na(openLine)
            line.set_x2(openLine, bar_index)

        if showLabels and not na(prevRange) and prevRange > 0 and not na(sessClose)
            rangeNow  = sessHigh - sessLow
            changePct = (rangeNow - prevRange) / prevRange * 100.0
            priceChangePct = sessOpen != 0 ? (sessClose - sessOpen) / sessOpen * 100.0 : 0
            volStatus = changePct > 10 ? "Expanding" : changePct < -10 ? "Contracting" : "Neutral"
            direction = priceChangePct >= 0 ? "+" : "-"
            txt = volStatus + " " + direction + str.tostring(priceChangePct, "#.##") + "%"
            lblY = sessHigh + (rangeNow * 0.12)
            lblColor = priceChangePct >= 0 ? colorBull : colorBear
            label.new(bar_index, lblY, txt, style = label.style_label_down,
                      textcolor = color.white, color = lblColor, size = size.tiny)

        prevRange := sessHigh - sessLow
        prevSessHigh := sessHigh
        prevSessLow := sessLow

    // Start new session
    if sessionId != 0
        sessHigh := high
        sessLow  := low
        sessOpen := open
        sessClose := close

        if showBoxes
            sessBox := box.new(left = bar_index, right = bar_index + 1,
                               top = high, bottom = low, border_width = 0)
            boxColor = sessionId == 1 ? colorAsia : sessionId == 2 ? colorLondon : colorNY
            box.set_bgcolor(sessBox, boxColor)

        if showOpenLine
            openLine := line.new(bar_index, open, bar_index + 1, open,
                                 color = color.new(color.yellow, 0), width = 1,
                                 style = line.style_dashed)

    prevSessionId := sessionId

// Update current session
if sessionId != 0
    sessHigh := math.max(sessHigh, high)
    sessLow  := math.min(sessLow,  low)
    sessClose := close

    if not na(sessBox)
        box.set_top(sessBox, sessHigh)
        box.set_bottom(sessBox, sessLow)
    if not na(openLine)
        line.set_x2(openLine, bar_index + 1)


// Breakouts from previous session (confirmed: marker prints on bar close)
breakAbove = showBreakout and barstate.isconfirmed and not na(prevSessHigh) and high > prevSessHigh and high[1] <= prevSessHigh
breakBelow = showBreakout and barstate.isconfirmed and not na(prevSessLow) and low < prevSessLow and low[1] >= prevSessLow

plotshape(breakAbove, title = "Session High Breakout",
          style = shape.triangleup, location = location.belowbar,
          color = colorBull, size = size.tiny, text = "BO")

plotshape(breakBelow, title = "Session Low Breakdown",
          style = shape.triangledown, location = location.abovebar,
          color = colorBear, size = size.tiny, text = "BD")

alertcondition(breakAbove, title = "Session High Breakout",
               message = "Session Flow: price broke above previous session high on {{ticker}} ({{interval}})")

alertcondition(breakBelow, title = "Session Low Breakdown",
               message = "Session Flow: price broke below previous session low on {{ticker}} ({{interval}})")