Untitled

//@version=6
strategy(shorttitle="BB", title="Bollinger Bands", overlay=true)
length = input.int(20, minval=1)
maType = input.string("SMA", "Basis MA Type", options = ["SMA", "EMA", "SMMA (RMA)", "WMA", "VWMA"])
src = input(close, title="Source")
mult = input.float(2.0, minval=0.001, maxval=50, title="StdDev")

var bool giris = false

ma(source, length, _type) =>
    switch _type
        "SMA" => ta.sma(source, length)
        "EMA" => ta.ema(source, length)
        "SMMA (RMA)" => ta.rma(source, length)
        "WMA" => ta.wma(source, length)
        "VWMA" => ta.vwma(source, length)

basis = ma(src, length, maType)
dev = mult * ta.stdev(src, length)
upper = basis + dev
lower = basis - dev
offset = input.int(0, "Offset", minval = -500, maxval = 500, display = display.data_window)
plot(basis, "Basis", color=#2962FF, offset = offset)
p1 = plot(upper, "Upper", color=#F23645, offset = offset)
p2 = plot(lower, "Lower", color=#089981, offset = offset)
fill(p1, p2, title = "Background", color=color.rgb(33, 150, 243, 95))

fark = ((upper - lower) / close) * 100

if ta.crossunder(close, lower)
    giris := true

if giris and ta.crossover(close, basis) and fark > 15
    strategy.entry("Long", strategy.long)
    giris := false

if strategy.position_size > 0 and ta.crossover(close, upper)
    strategy.exit("TP", "Long", limit = close)

if strategy.position_size > 0 and ta.crossunder(close, lower)
    strategy.exit("Stop Loss", "Long", limit = close)