London Breakout - Session Strategy

// This Pine Script™ code is subject to the terms of the Mozilla Public License 2.0
// © TradingTools

//@version=5
strategy("London Breakout - Session Strategy", overlay=true, default_qty_type=strategy.percent_of_equity, default_qty_value=100)

// ─── Inputs ───
asianSession    = input.session("0000-0700", "Asian Range Session (UTC)", group="Sessions")
londonSession   = input.session("0700-1100", "London Trading Window (UTC)", group="Sessions")
closeSession    = input.session("1100-1600", "Close Window (UTC)", group="Sessions")
bufferPips      = input.float(5, "Breakout Buffer (pips)", step=1, group="Entry")
pipValue        = input.float(0.0001, "Pip Value", step=0.0001, group="Entry", tooltip="0.0001 for most pairs, 0.01 for JPY")
atrLength       = input.int(14, "ATR Length", group="Risk Management")
atrMult         = input.float(1.5, "ATR Multiplier for SL", step=0.1, group="Risk Management")
rrRatio         = input.float(2.0, "Risk:Reward Ratio", step=0.1, group="Risk Management")
maxTrades       = input.int(1, "Max Trades Per Day", group="Risk Management")
showBox         = input.bool(true, "Show Asian Range Box", group="Display")

// ─── Session Detection ───
isAsian  = not na(time(timeframe.period, asianSession))
isLondon = not na(time(timeframe.period, londonSession))
isClose  = not na(time(timeframe.period, closeSession))

// ─── Asian Range ───
var float asianHigh = na
var float asianLow  = na
var bool  rangeSet  = false
var int   dailyTrades = 0

// Reset at start of Asian session
if isAsian and not isAsian[1]
    asianHigh := high
    asianLow  := low
    rangeSet  := false
    dailyTrades := 0

// Build range during Asian session
if isAsian
    asianHigh := math.max(asianHigh, high)
    asianLow  := math.min(asianLow, low)

// Lock range at end of Asian session
if not isAsian and isAsian[1]
    rangeSet := true

// ─── Buffer ───
buffer = bufferPips * pipValue

// ─── ATR ───
atrVal = ta.atr(atrLength)

// ─── Entry Conditions ───
longCondition  = rangeSet and isLondon and close > (asianHigh + buffer) and dailyTrades < maxTrades
shortCondition = rangeSet and isLondon and close < (asianLow - buffer) and dailyTrades < maxTrades

// ─── Execute Trades ───
if longCondition and strategy.position_size == 0
    sl = close - atrVal * atrMult
    tp = close + (close - sl) * rrRatio
    strategy.entry("London Long", strategy.long)
    strategy.exit("London Long Exit", "London Long", stop=sl, limit=tp)
    dailyTrades += 1

if shortCondition and strategy.position_size == 0
    sl = close + atrVal * atrMult
    tp = close - (sl - close) * rrRatio
    strategy.entry("London Short", strategy.short)
    strategy.exit("London Short Exit", "London Short", stop=sl, limit=tp)
    dailyTrades += 1

// ─── Close at End of Window ───
if not isLondon and not isClose and strategy.position_size != 0
    strategy.close_all("Window Closed")

// ─── Plotting ───
asianHighLine = plot(showBox and rangeSet and (isLondon or isClose) ? asianHigh : na, "Asian High", color=color.new(color.teal, 0), linewidth=2, style=plot.style_linebr)
asianLowLine  = plot(showBox and rangeSet and (isLondon or isClose) ? asianLow : na, "Asian Low", color=color.new(color.teal, 0), linewidth=2, style=plot.style_linebr)
fill(asianHighLine, asianLowLine, color=color.new(color.teal, 88), title="Asian Range")

bgcolor(isAsian ? color.new(color.purple, 95) : isLondon ? color.new(color.yellow, 95) : na, title="Session Highlight")

plotshape(longCondition and strategy.position_size[1] == 0, title="London Long", location=location.belowbar, style=shape.arrowup, color=color.green, size=size.small, text="LDN")
plotshape(shortCondition and strategy.position_size[1] == 0, title="London Short", location=location.abovebar, style=shape.arrowdown, color=color.red, size=size.small, text="LDN")

// ─── Alerts ───
alertcondition(longCondition, title="London Long Breakout", message="London Breakout: Price broke above Asian range — Long")
alertcondition(shortCondition, title="London Short Breakout", message="London Breakout: Price broke below Asian range — Short")
alertcondition(rangeSet and not rangeSet[1], title="Asian Range Set", message="London Breakout: Asian range established")