EUR/USD London Breakout [trugurpala]

//@version=6
// EUR/USD — London Session Breakout Strategy
// Author: Ugur Pala · github.com/trugurpala/pinescriptv6
// TradingView: https://tr.tradingview.com/u/trugurpala/
//
// TR: Londra seansı açılmadan önceki dar Asya aralığını belirler,
//     Londra açılışında bu aralığın kırılması üzerine giriş yapar.
//     Forex piyasasında en güvenilir kırılma stratejilerinden biri.
// EN: Identifies the tight Asia session range before London open,
//     enters on breakout of that range at London open.
//     One of the most reliable breakout strategies in Forex.
//
// Sembol / Symbol: FX:EURUSD / OANDA:EURUSD
// Önerilen TF / Recommended TF: 15M, 1H
strategy("EUR/USD London Breakout [trugurpala]",
    overlay           = true,
    initial_capital   = 10000,
    default_qty_type  = strategy.percent_of_equity,
    default_qty_value = 2,
    commission_type   = strategy.commission.percent,
    commission_value  = 0.005,
    slippage          = 1)

// ── Inputs ───────────────────────────────────────────────────────────────────
float atrMult   = input.float(1.5, "SL ATR Mult", step=0.1)
float rrRatio   = input.float(2.0, "R:R Ratio",   step=0.1)
bool  closeEOD  = input.bool(true, "Close at NY Close (21:00 GMT)")

// ── Seans Tanımları ──────────────────────────────────────────────────────────
bool asiaRange   = not na(time(timeframe.period, "0300-0700", "GMT"))
bool inLondon    = not na(time(timeframe.period, "0800-1600", "GMT"))
bool nyClose     = not na(time(timeframe.period, "2100-2101", "GMT"))

if closeEOD and nyClose
    strategy.close_all(comment="NY Close")

// ── Asya Aralığı ─────────────────────────────────────────────────────────────
var float asiaHigh  = na
var float asiaLow   = na
var bool  rangeDone = false

bool newDay = ta.change(time("D")) != 0
if newDay
    asiaHigh  := na
    asiaLow   := na
    rangeDone := false

if asiaRange
    asiaHigh := na(asiaHigh) ? high : math.max(asiaHigh, high)
    asiaLow  := na(asiaLow)  ? low  : math.min(asiaLow,  low)

if not asiaRange and not na(asiaHigh)
    rangeDone := true

// ── Sinyaller ────────────────────────────────────────────────────────────────
float atrVal     = ta.atr(14)
bool  longBreak  = rangeDone and inLondon
                    and ta.crossover(close, asiaHigh)
                    and strategy.position_size == 0
bool  shortBreak = rangeDone and inLondon
                    and ta.crossunder(close, asiaLow)
                    and strategy.position_size == 0

// ── Entries ──────────────────────────────────────────────────────────────────
if longBreak
    float sl = close - atrMult * atrVal
    strategy.entry("Long", strategy.long)
    strategy.exit("Long Exit", "Long", stop=sl, limit=close + rrRatio * (close - sl))

if shortBreak
    float sl = close + atrMult * atrVal
    strategy.entry("Short", strategy.short)
    strategy.exit("Short Exit", "Short", stop=sl, limit=close - rrRatio * (sl - close))

// ── Visuals ──────────────────────────────────────────────────────────────────
plot(rangeDone ? asiaHigh : na, "Asia High", color.new(color.red,   30), linewidth=2, style=plot.style_linebr)
plot(rangeDone ? asiaLow  : na, "Asia Low",  color.new(color.green, 30), linewidth=2, style=plot.style_linebr)
bgcolor(asiaRange ? color.new(color.blue,   93) : na, title="Asia Range")
bgcolor(inLondon  ? color.new(color.yellow, 96) : na, title="London")
plotshape(longBreak,  "Long",  shape.triangleup,   location.belowbar, color.green, size=size.small)
plotshape(shortBreak, "Short", shape.triangledown, location.abovebar, color.red,   size=size.small)

// ── Alerts (alert() — strategy içinde çalışır) ───────────────────────────────
if longBreak
    alert("EURUSD London Breakout Long — " + str.tostring(close, "#.#####"), alert.freq_once_per_bar)
if shortBreak
    alert("EURUSD London Breakout Short — " + str.tostring(close, "#.#####"), alert.freq_once_per_bar)