// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/

//@version=4
strategy("sma cross", overlay=true)
sma_length = input(200, "SMA Time Horizon")
use_fract = input(false, "Use Fraction Strategy")
fract = input(0.02, "Fraction to Close")

longCondition = use_fract? close < sma(close, sma_length) * (1.0 - fract) : crossover(close, sma(close, sma_length))
if (longCondition)
    strategy.entry("buy", strategy.long)

shortCondition = use_fract? close > sma(close, sma_length) * (1.0 + fract) : crossunder(close, sma(close, sma_length))
if (shortCondition)
    strategy.exit("buy")