//@version=5
strategy("BTC Trend Breakout — Risk Managed",
     overlay = true,
     initial_capital = 10000,
     currency = currency.USD,
     pyramiding = 0,
     commission_type = strategy.commission.percent,
     commission_value = 0.10,
     slippage = 10,
     margin_long = 100,
     margin_short = 100,
     calc_on_every_tick = false,
     calc_on_order_fills = false,
     process_orders_on_close = false)

// Intended for standard BTC/USD or BTC/USDT charts.
// Position sizing assumes a linear instrument quoted in USD or USDT.

// ── Inputs ────────────────────────────────────────────────────────────────
breakoutLength = input.int(20, "Breakout lookback", minval = 2)
trendLength    = input.int(200, "Trend EMA length", minval = 2)
slopeLookback  = input.int(10, "Trend slope lookback", minval = 1)
exitLength     = input.int(50, "Exit EMA length", minval = 2)

atrLength      = input.int(14, "ATR length", minval = 1)
stopATR        = input.float(2.5, "Stop distance: ATR multiple",
     minval = 0.5, step = 0.1)
rewardRisk     = input.float(3.0, "Profit target: reward/risk",
     minval = 0.5, step = 0.25)

riskPercent    = input.float(1.0, "Equity risk per trade (%)",
     minval = 0.1, maxval = 5.0, step = 0.1)
allocationPct  = input.float(95.0, "Maximum capital allocation (%)",
     minval = 1.0, maxval = 100.0, step = 1.0)

// ── Indicators ────────────────────────────────────────────────────────────
trendEMA = ta.ema(close, trendLength)
exitEMA  = ta.ema(close, exitLength)
atrValue = ta.atr(atrLength)

// Exclude the current bar from the breakout level.
breakoutLevel = ta.highest(high, breakoutLength)[1]

ready = not na(trendEMA[slopeLookback]) and
     not na(breakoutLevel) and not na(atrValue)

uptrend = close > trendEMA and trendEMA > trendEMA[slopeLookback]
breakout = ta.crossover(close, breakoutLevel)

// Store the initial trade's stop distance in ticks.
var int tradeStopTicks = na
var int tradeTargetTicks = na

// ── Entry and position sizing ────────────────────────────────────────────
if barstate.isconfirmed and ready and strategy.position_size == 0
    if uptrend and breakout and strategy.equity > 0
        stopTicks = int(math.max(1.0,
             math.ceil(atrValue * stopATR / syminfo.mintick)))

        stopDistance = stopTicks * syminfo.mintick
        riskCash = strategy.equity * riskPercent / 100.0

        riskQuantity = riskCash /
             (stopDistance * syminfo.pointvalue)

        capitalQuantity = (strategy.equity * allocationPct / 100.0) /
             (close * syminfo.pointvalue)

        quantity = math.min(riskQuantity, capitalQuantity)

        if quantity > 0
            tradeStopTicks := stopTicks
            tradeTargetTicks := int(math.max(1.0,
                 math.round(stopTicks * rewardRisk)))

            strategy.entry("Long", strategy.long, qty = quantity)

            // Relative tick distances anchor the bracket to the fill price.
            // Submit protection alongside the entry order.
            strategy.exit("Bracket", from_entry = "Long",
                 loss = tradeStopTicks,
                 profit = tradeTargetTicks)

// Keep the original bracket active; ATR changes do not widen the stop.
if strategy.position_size > 0
    strategy.exit("Bracket", from_entry = "Long",
         loss = tradeStopTicks,
         profit = tradeTargetTicks)

    if barstate.isconfirmed and close < exitEMA
        strategy.close("Long", comment = "Trend exit")

// ── Chart display ─────────────────────────────────────────────────────────
stopPrice = strategy.position_size > 0 ?
     strategy.position_avg_price -
     tradeStopTicks * syminfo.mintick : na

targetPrice = strategy.position_size > 0 ?
     strategy.position_avg_price +
     tradeTargetTicks * syminfo.mintick : na

plot(trendEMA, "Trend EMA", color = color.orange, linewidth = 2)
plot(exitEMA, "Exit EMA", color = color.blue)
plot(breakoutLevel, "Previous breakout high", color = color.gray)
plot(stopPrice, "Stop", color = color.red, style = plot.style_linebr)
plot(targetPrice, "Target", color = color.green, style = plot.style_linebr)