London Breakout Trading Strategy

//@version=5
strategy("London Breakout Strategy (Quant Audited) [FXSnipers]", 
     overlay=true, 
     initial_capital=10000, 
     currency=currency.USD, 
     default_qty_type=strategy.percent_of_equity, 
     default_qty_value=10, 
     commission_type=strategy.commission.cash_per_contract, 
     commission_value=3.5, 
     slippage=12)

// --- Session Inputs (Explicit UTC Timezone) ---
asianSessionInput = input.session("0000-0700:1234567", "Asian Range Window (UTC)")
londonSessionInput = input.session("0700-1100:1234567", "London Active Entry Window (UTC)")
timezoneInput      = input.string("UTC", "Timezone Mode")
riskReward         = input.float(2.0, "Risk to Reward Ratio", minval=1.0, step=0.5)
riskPerTradePct    = input.float(1.0, "Risk Per Trade (% of Equity)", minval=0.1, maxval=5.0)
minRangePips       = input.float(15.0, "Min Asian Range (Pips)", minval=5.0)

// --- Convert Pips to Ticks ---
pipSize = syminfo.mintick * 10
minRangePrice = minRangePips * pipSize

// --- Session Time Filtering ---
inAsianWindow  = not na(time(timeframe.period, asianSessionInput, timezoneInput))
inLondonWindow = not na(time(timeframe.period, londonSessionInput, timezoneInput))

// --- Asian High / Low Tracking ---
var float asianHigh = na
var float asianLow  = na
var bool  tradeTakenToday = false

// Reset daily session tracking at start of Asian window
if inAsianWindow and not inAsianWindow[1]
    asianHigh := high
    asianLow  := low
    tradeTakenToday := false
else if inAsianWindow
    asianHigh := math.max(asianHigh, high)
    asianLow  := math.min(asianLow, low)

// --- Visual Range Bands ---
plot(asianHigh, "Asian High", color=color.new(color.blue, 20), linewidth=2, style=plot.style_line)
plot(asianLow,  "Asian Low",  color=color.new(color.red, 20),  linewidth=2, style=plot.style_line)
rangeMidpoint = (asianHigh + asianLow) / 2
plot(rangeMidpoint, "Asian Midpoint", color=color.new(color.gray, 50), style=plot.style_cross)

// --- Breakout Execution Criteria ---
rangeWidth = asianHigh - asianLow
isValidRange = rangeWidth >= minRangePrice

// Close outside range during active London session
longBreakout  = inLondonWindow and not tradeTakenToday and isValidRange and (close > asianHigh) and (close[1] <= asianHigh)
shortBreakout = inLondonWindow and not tradeTakenToday and isValidRange and (close < asianLow) and (close[1] >= asianLow)

// --- Order Sizing & Execution ---
if longBreakout and strategy.position_size == 0
    float sl = asianLow
    float riskDistance = close - sl
    if riskDistance > 0
        // Correct position sizing: Risk % of Equity on Stop Loss
        float riskAmount = (strategy.equity * (riskPerTradePct / 100))
        float contractSize = riskAmount / (riskDistance / syminfo.mintick * syminfo.pointvalue)
        float tp = close + (riskDistance * riskReward)
        strategy.entry("Long Breakout", strategy.long, qty=contractSize)
        strategy.exit("Exit Long", "Long Breakout", stop=sl, limit=tp)
        tradeTakenToday := true

if shortBreakout and strategy.position_size == 0
    float sl = asianHigh
    float riskDistance = sl - close
    if riskDistance > 0
        float riskAmount = (strategy.equity * (riskPerTradePct / 100))
        float contractSize = riskAmount / (riskDistance / syminfo.mintick * syminfo.pointvalue)
        float tp = close - (riskDistance * riskReward)
        strategy.entry("Short Breakout", strategy.short, qty=contractSize)
        strategy.exit("Exit Short", "Short Breakout", stop=sl, limit=tp)
        tradeTakenToday := true

// Close open trades if outside session end or end of day
if not inLondonWindow and inLondonWindow[1]
    // Optional session expiration rule
    na