//@version=5
indicator("ATR Trend Bands [Misu]", overlay = true, shorttitle="ATR TB [Misu]")//, initial_capital=50000, default_qty_type=strategy.percent_of_equity, default_qty_value=100)


// import Fontiramisu/fontLib/86 as fontilab
import Fontiramisu/fontilab/11 as fontilab

// ] -------- Input  --------------- [
src         = input.source(close, "Source", group="Settings")
len         = input.int(5, "Length Atr", group = "Settings")
mult        = input.float(7.6, "Multiplier Atr", step = 0.1, group = "Settings")

colorbars   = input.bool(true, "Color Bars", group = "UI Settings")
showlmidbs   = input.bool(true, "Show Label", group = "UI Settings")

// ] -------- Vars  --------------- [
// Cond Vars.
// _bodyHi     = math.max(close, open)
// _bodyLo     = math.min(close, open)
// _body       = _bodyHi - _bodyLo
// _bodyAvg    = ta.ema(_body, len)

// ] -------- Logic ----------------- [
deltaAtr                = mult * ta.atr(len)
[midb, upperb, lowerb]  = fontilab.getTrendBands(src, deltaAtr)

trendUp     = midb > nz(midb[1])
trendDown   = midb < nz(midb[1])

lastState   = 0
lastState   := nz(lastState[1])
lastState   := trendUp ? 1 : trendDown ? -1 : nz(lastState[1])

buyCond     = trendUp and nz(lastState[1]) == -1
sellCond    = trendDown and nz(lastState[1]) == 1

// ] -------- Strategy Part ------------ [
// if buyCond
//     strategy.entry("L", strategy.long, alert_message="Buy Signal")

// if sellCond
//     strategy.entry("S", strategy.short, alert_message="Sell Signal")

// ] -------- Plot Part --------------- [
var color colorTrend = na
colorTrend := midb < nz(midb[1]) ? color.red : midb > nz(midb[1]) ? color.green : nz(colorTrend[1])
barcolor(colorbars ? colorTrend : na)

plot(upperb, "Upper Band", color = colorTrend, linewidth = 2)
plot(lowerb, "Lower Band", color = colorTrend, linewidth = 2)

if showlmidbs and buyCond
    label.new(x = bar_index, y = low - (ta.atr(30) * 0.3), xloc = xloc.bar_index, text = "L", style = label.style_label_up, color = color.green, size = size.small, textcolor = color.white, textalign = text.align_center)
else if showlmidbs and sellCond
    label.new(x = bar_index, y = high + (ta.atr(30) * 0.3), xloc = xloc.bar_index, text = "S", style = label.style_label_down, color = color.red, size = size.small, textcolor = color.white, textalign = text.align_center)

// ] -------- Alerts ----------------- [
alertcondition(buyCond, title = "Long", message = "ATR Trend Bands [Misu]: Long\nSymbol: {{ticker}}\nPrice: {{close}}")
alertcondition(sellCond, title = "Short", message = "ATR Trend Bands [Misu]: Short\nSymbol: {{ticker}}\nPrice: {{close}}")

// ]