Highs and lows

//@version=4
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Coded by Eduardo Mattje
strategy("Highs and lows", "HsLs", true, default_qty_type=strategy.percent_of_equity, default_qty_value=100, initial_capital=50000, process_orders_on_close=true)
// Inputs
var I_ENTRY_LENGTH = input(2, "Entry length", minval=1, inline="Length", group="Basic settings")
var I_EXIT_LENGTH = input(2, "Exit length", minval=1, inline="Length", group="Basic settings")
var I_CLOSE_AFTER = input(5, "Close after X candles", tooltip="Leave 0 if you want this to be disabled.", group="Basic settings")
var I_ATR_ENTRY_MULT = input(0.0, "ATR entry multiplier", step=0.1, inline="ATR settings", group="ATR settings")
var I_ATR_EXIT_MULT = input(0.0, "ATR exit multiplier", step=0.1, inline="ATR settings", group="ATR settings")
var I_ATR_PERIOD = input(20, "ATR period", minval=2, inline="ATR settings", group="ATR settings")
var I_INITIAL_DATE = input(0, "Initial date", input.time, tooltip="Leave this value as it is to disable.", inline="Date selection", group="Date selection")
var I_FINAL_DATE = input(0, "Final date", input.time, tooltip="Leave this value as it is to disable.", inline="Date selection", group="Date selection")
// Calculations
_lowest = lowest(I_ENTRY_LENGTH) - atr(I_ENTRY_LENGTH) * I_ATR_ENTRY_MULT
_highest = highest(I_EXIT_LENGTH) + atr(I_EXIT_LENGTH) * I_ATR_EXIT_MULT
inMarket = strategy.opentrades != 0
opened = strategy.opentrades[0] > strategy.opentrades[1]
plot(not inMarket or not inMarket[1] ? _lowest[1] : na, "Entry price", color.red, 2, plot.style_linebr, offset=0)
plot(inMarket or inMarket[1] ? _highest[1] : na, "Exit price", color.teal, 2, plot.style_linebr, offset=0)
// Range check
inRange = (I_INITIAL_DATE == 0 ? true : time >= I_INITIAL_DATE) and (I_FINAL_DATE == 0 ? true : time <= I_FINAL_DATE)
// Orders
strategy.entry("Long", true, limit=_lowest, comment="Entry long", when=inRange)
strategy.exit("Long", "Long", limit=_highest, comment="Exit long")
if I_CLOSE_AFTER and barssince(opened) >= I_CLOSE_AFTER
    strategy.close_all(comment="It has been " + tostring(I_CLOSE_AFTER) + " candle" + (I_CLOSE_AFTER > 1 ? "s" : "")  + " since you entered")
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