Smart Trail 4.0

//@version=5

indicator("Smart Trail [4.0]", overlay = true)

getBandOffsetSource(srcIn, isUpperBand) =>
    // Initialize the return to our fail-safe 'close', which is also the default input, then update thru the switch statement
    ret = close
    switch srcIn
        "close" => ret := close
        "wicks" => ret := isUpperBand ? high : low
        => ret := close
    ret

getSmartTrail(float scaledATR) =>
    //atr = ta.atr(atrPeriod)
    //scaledATR = atr * atrMultiplier
    upperATRBand = getBandOffsetSource("close", true) + scaledATR
    lowerATRBand = getBandOffsetSource("close", false) - scaledATR
    //

    var b = 0.
    var pos = 1



    // Since we can calcualte ATR bands based on either close or wicks, we need to be sure to normalize the true distance
    // from the close to the "stop band" before we can then apply our take-profit scaler and calculate the TP bands...



    // OG ATR Band Plotting
    upper = ta.sma(upperATRBand, 10)
    lower = ta.sma(lowerATRBand, 10)
    upper := ta.ema(upper, 5)
    lower := ta.ema(lower, 5)
    if pos == 1
        b := lower
    if pos == -1
        b := upper

    if pos == 1 and close < lower
        pos := -1
        b := upper
    if pos == -1 and close > upper
        pos := 1
        b := lower

    //plot(upper, title="Upper ATR Band", color=color.rgb(0, 255, 0, 50), linewidth=2)
    //plot(lower, title="Lower ATR Band", color=color.rgb(255, 0, 0, 50), linewidth=2)
    b

int smartsens = input(4, "Sensetivity")
int atrlen = smartsens == 1 ? 3 : smartsens == 2 ? 5 : smartsens == 3 ? 7 : 2
atrmul = smartsens*0.5

//plot(vola)
//atrmul := atrmul
scaleatr = ta.atr(atrlen)*atrmul
supert = getSmartTrail(scaleatr)

supert2 = 0.00
atrs = ta.atr(atrlen*5)
supert2 := if close > supert
    supert + atrs
else if close < supert
    supert - atrs

smb = input.color(#2157f9, "Smart Trail", inline = "2")
smre = input.color(#ff0000, "", inline = "2")
t = plot(supert, color = close > supert ? smb:smre)
tt = plot(supert2, color = color.new(color.black, 100))
fill(t, tt, close > supert?color.new(smb, 80) : color.new(smre, 80))