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

//@version=4
study("ysantur Yeşillim", overlay = true)


src = (close*2+high+low+open)/5
depth = input(title="Depth", type=input.integer, defval=10)
smooth = input(title="Smooth", type=input.integer, defval=9)

bias = input(title="Bias", type=input.float, step=0.1, defval=0.3)
up=(100+bias)/100
down=(100-bias)/100

f=array.new_int(depth+1)
W=array.new_float(depth)
a=1
b=1
sum=0.0

for i=0 to depth
    array.set(f,i,a+b)
    a:=b
    b:=array.get(f,i)

x=0.0

for i=1 to depth-1
    array.set(W,i,array.get(f,depth-1)/array.get(f,i))
    sum:=sum+array.get(f,depth-1)/array.get(f,i)

for i=1 to depth-1
    x:=x+array.get(W,depth-i) * src

x:=x/sum

x:=ema(x,8)
y=ema(x,3)
e1 = stdev(x, 3)
e2 = stdev(x, 8)

u=x+e1
l=x-2*(e1+e2)


buySignal = crossover(src, x)
sellSignal = crossunder(src, y)
//plotshape(buySignal,text="Buy",style=shape.labelup, size=size.tiny,color=color.green, textcolor=color.white)
//plotshape(sellSignal,text="Sell",style=shape.labeldown, size=size.tiny,color=color.red, textcolor=color.white)

renk=color.yellow
if (crossover(src, x) or src>=x ) or src>=y
    renk:=color.green
if (crossunder(src, y) or src<y)
    renk:=color.red

plot(l,color=renk, linewidth=3)


// Alerts
// ***************************************************
longCond = bool(na)
shortCond = bool(na)

longCond := crossover(src, x)
shortCond := crossunder(src, y)

CondIni = 0
CondIni := longCond ? 1 : shortCond ? -1 : CondIni[1]
long = longCond and CondIni[1] == -1
short = shortCond and CondIni[1] == 1
plotshape(long, title="BUY", text="B", style=shape.labeldown, textcolor=color.white, size=size.auto, location=location.top, color=color.green, transp=0)
plotshape(short, title="SELL", text="S", style=shape.labelup, textcolor=color.white, size=size.auto, location=location.bottom, color=color.red, transp=0)
alertcondition(longCond, title="BUY", message="BUY")
alertcondition(shortCond, title="SELL", message="SELL")