STRG-BBForce

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

//@version=5
strategy("STRG-BBForce", initial_capital = 10000, overlay=true, margin_long=0, margin_short=0)
//--------------- Built in BB Modified ---------------
length = input.int(26, minval=1)
src = input(close, title="Source")
mult = input.float(2.0, minval=0.001, maxval=50, title="StdDev")
basis = ta.sma(src, length)
dev = mult * ta.stdev(src, length)
upper = basis + dev
lower = basis - dev
offset = input.int(0, "Offset", minval = -500, maxval = 500)
// fill(p1, p2, title = "Background", color=color.rgb(33, 150, 243, 95))
//--------------- Built in BB Modified ---------------
var existingCondition = 0
condition1 = if upper[0] < upper[1] and lower[0] < lower[1] and basis[0] < basis[1]
    -1
condition2 = if upper[0] > upper[1] and lower[0] > lower[1] and basis[0] > basis[1]
    1
conditionFull = condition1?-1:condition2?1:na

conditionMini = 0
if conditionFull != existingCondition
    conditionMini := conditionFull
    existingCondition := conditionFull
    existingCondition
    
// set conditionFull to show partial bands only when 3 elements point downwards
// p1 = plot(upper, "Upper", color=color.new(color.blue, conditionFull==-1?0:conditionFull==1?0:100), offset = offset, style = plot.style_stepline, linewidth = 4)
// plot(basis, "Basis", color=color.new(color.orange, conditionFull==-1?0:conditionFull==1?0:100), offset = offset, style = plot.style_stepline, linewidth = 4)
// p2 = plot(lower, "Lower", color=color.new(color.blue, conditionFull==-1?0:conditionFull==1?0:100), offset = offset, style = plot.style_stepline, linewidth = 4)
// plotarrow(conditionFull, 'Force', colorup=color.new(color.black, 0), colordown=color.new(color.black, 0), maxheight = 15)

p1 = plot(upper, "Upper", color=color.new(color.blue, 0), offset = offset, style = plot.style_stepline, linewidth = 4,display = display.all)
plot(basis, "Basis", color=color.new(color.orange, 0), offset = offset, style = plot.style_stepline, linewidth = 4,display = display.none)
p2 = plot(lower, "Lower", color=color.new(color.blue, 0), offset = offset, style = plot.style_stepline, linewidth = 4,display = display.all)

plotarrow(conditionFull, 'Force Full', colorup=color.new(color.fuchsia, 0), colordown=color.new(color.fuchsia, 0), maxheight = 15,display = display.none)
plotarrow(conditionMini, 'Force Mini', colorup=color.new(color.yellow, 0), colordown=color.new(color.yellow, 0), maxheight = 15)
contracts = strategy.initial_capital / close // strategy.equity / close
longCondition = conditionMini==1?true:false
fromDate = input.int(2018, 'Look back since')
partialProfitPerc = input.int(50,'Partial Profit %')
if (longCondition and year >= fromDate)
    strategy.close_all("CLOSE ALL")
    strategy.entry("L", strategy.long,qty = contracts)
strategy.exit("PARTIAL%", "L", qty_percent = partialProfitPerc, limit = upper, stop = lower)
strategy.exit("Stop L","L", qty = math.abs(strategy.position_size), stop = lower) // position size can be negative and positive, it needs to be positive in this case

shortCondition = conditionMini==-1?true:false
if (shortCondition and year >= fromDate)
    strategy.close_all("CLOSE ALL")
    strategy.entry("S", strategy.short,qty = contracts)
strategy.exit("PARTIAL%", "S", qty_percent = partialProfitPerc, limit = lower, stop = upper)
strategy.exit("Stop S","S", qty = math.abs(strategy.position_size), stop = upper)

// plotchar(strategy.position_size, char='❄') //allows for checking position size in data window