//@version=6
strategy("Workshop 17 Breakout Laboratory", overlay=true,
    initial_capital=10000, default_qty_type=strategy.fixed,
    default_qty_value=1, pyramiding=0,
    commission_type=strategy.commission.percent,
    commission_value=0.10, slippage=1,
    process_orders_on_close=false, calc_on_every_tick=false)
length = input.int(20, "Prior high bars", minval=2)
exitLength = input.int(10, "Exit average bars", minval=2)
start = input.time(timestamp("01 Jan 2020 00:00 +0000"),
    "Start entries")
finish = input.time(timestamp("01 Jan 2025 00:00 +0000"),
    "Stop entries and request exit")
if finish <= start
    runtime.error("Finish must follow start")
boundary = ta.highest(high, length)[1]
exitLine = ta.sma(close, exitLength)
inside = time >= start and time < finish
ready = bar_index >= math.max(length, exitLength)
enter = (ready and inside and close > boundary and
    barstate.isconfirmed)
leave = close < exitLine or time >= finish
if strategy.position_size > 0 and leave
    strategy.close("Long")
else if enter and strategy.position_size == 0
    strategy.entry("Long", strategy.long)
plot(boundary, "Entry reference", color=color.gray)
plot(exitLine, "Exit average", color=color.blue)