ATR Strategy FOREX for long only with market filter
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Investoz

//@version=4
strategy("ATR Strategy FOREX", overlay=true, default_qty_type=strategy.percent_of_equity, default_qty_value=100)

len = input(26, type=input.integer, minval=1, title="Length")
mul = input(2.618, type=input.float, minval=0, title="Length")
mullow = input(2.386, type=input.float, minval=0, title="Length")

price = sma(close, 1)
average = ema(close, len)
diff = atr(len) * mul
difflow = atr(len) * mullow

bull_level = average + diff
bear_level = average - difflow
bull_cross = crossunder(price, bear_level)
bear_cross = crossunder(bull_level, price)

FromMonth = input(defval = 8, title = "From Month", minval = 1, maxval = 12)
FromDay   = input(defval = 18, title = "From Day", minval = 1, maxval = 31)
FromYear  = input(defval = 2008, title = "From Year", minval = 2008)
ToMonth   = input(defval = 1, title = "To Month", minval = 1, maxval = 12)
ToDay     = input(defval = 1, title = "To Day", minval = 1, maxval = 31)
ToYear    = input(defval = 2020, title = "To Year", minval = 2019)

start     = timestamp(FromYear, FromMonth, FromDay, 00, 00)  
finish    = timestamp(ToYear, ToMonth, ToDay, 23, 59)       
startTimeOk()  => time >= start and time <= finish ? true : false

if (startTimeOk()) and ema(close,1) > ema(close,528)
    strategy.entry("KOP", strategy.long, when=bull_cross) 
    strategy.close("KOP", when=bear_cross)  
//if (startTimeOk()) and ema(close,1) < ema(close,528)
//    strategy.entry("SALJ", strategy.short, when=bear_cross) 
//    strategy.close("SALJ", when=bull_cross)

plot(price, title="price", color=color.black, transp=50, linewidth=2)
a0 = plot(average, title="average", color=color.red, transp=50, linewidth=1)
a1 = plot(bull_level, title="bull", color=color.green, transp=50, linewidth=1)
a2 = plot(bear_level, title="bear", color=color.red, transp=50, linewidth=1)
fill(a0, a1, color=color.green, transp=97)
fill(a0, a2, color=color.red, transp=97)