//@version=4
study(shorttitle="Trend stratégie V.3", title="Trend stratégie V.3", overlay=true, resolution="")

src         = input(close, title = "Source")
length      = input(55, minval=1, title = "SMA length")// 20 for classis Bollinger Bands SMA line (basis)
CC          = input(true, "Color Bars")


mult        = input(1., minval=0.236, maxval=2.5, title="Standard Deviation")//2 for Classic Bollinger Bands //Maxval = 2 as higher the deviation, higher the risk
basis       = sma(src, length)
dev         = mult * stdev(src,length)

upper       = basis + dev
lower       = basis - dev

//Conditions for Long and Short - Extra filter condition can be used such as RSI or CCI etc.

short       = src<lower and rsi(close,14)<30
long        = src>upper and rsi(close,14)>70

L1          = barssince(long)
S1          = barssince(short)

longSignal  = L1<S1 and not (L1<S1)[1]
shortSignal = S1<L1 and not (S1<L1)[1]

//Plots and Fills



////Long/Short shapes with text
plotshape(S1<L1 and not (S1<L1)[1]?close:na, text = "sᴇʟʟ", textcolor=#ff0100, color=#ff0100, style=shape.triangledown, size=size.small, location=location.abovebar, transp=0, title = "SELL", editable = true)
plotshape(L1<S1 and not (L1<S1)[1]?close:na, text = "ʙᴜʏ", textcolor = #008000, color=#008000, style=shape.triangleup, size=size.small, location=location.belowbar, transp=0, title = "BUY", editable = true)  


plotshape(shortSignal?close:na, color=#F44336, style=label.style_flag, size=size.tiny, location=location.abovebar, text = "Vente", transp=0, title = "Signal Vente", editable = true)
plotshape(longSignal?close:na, color=#009688, style=label.style_flag, size=size.tiny, location=location.belowbar, text = "Achat", transp=0, title = "Signal Achat", editable = true)  



p1          = plot(upper, color=#ff0000, display=display.all, transp=75, title = "Upper Band")
p2          = plot(lower, color=#008000, display=display.all, transp=75, title = "Lower Band")


p           = plot(basis, color=L1<S1?#008000:S1<L1?#ff0000:na, linewidth=2, editable=false, title="Basis")


fill(p,p1, color=color.teal, transp=85, title = "Top Fill") //fill for basis-upper
fill(p,p2, color=color.orange, transp=85, title = "Bottom Fill")//fill for basis-lower


//Barcolor

bcol        = src>upper?color.new(#009688,0): 
             src<lower?color.new(#F44336,0):
             src>basis?color.green:
             src<basis?color.red:na


barcolor(CC?bcol:na, editable=false, title = "Couleurs bougies")



//Alerts ----  // Use 'Once per bar close'

alertcondition(condition=longSignal, title="Long - BB Filter", message='BB Filter Long @ {{close}}') // Use 'Once per bar close'
alertcondition(condition=longSignal, title="Short - BB Filter", message='BB Filter Short @ {{close}}')  // Use 'Once per bar close'