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// This work is licensed under a Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) https://creativecommons.org/licenses/by-nc-sa/4.0/
// © alexgrover

//Original post : Alpaca.markets/learn/andean-oscillator-a-new-technical-indicator-based-on-an-online-algorithm-for-trend-analysis/

//@version=5
indicator("Andean Oscillator")
//------------------------------------------------------------------------------
//Settings
//-----------------------------------------------------------------------------{
length     = input(50)

sig_length = input(9,'Signal Length')

//-----------------------------------------------------------------------------}
//Exponential Envelopes
//-----------------------------------------------------------------------------{
var alpha = 2/(length+1)

var up1 = 0.,var up2 = 0.
var dn1 = 0.,var dn2 = 0.

C = close
O = open

up1 := nz(math.max(C, O, up1[1] - (up1[1] - C) * alpha), C)
up2 := nz(math.max(C * C, O * O, up2[1] - (up2[1] - C * C) * alpha), C * C)

dn1 := nz(math.min(C, O, dn1[1] + (C - dn1[1]) * alpha), C)
dn2 := nz(math.min(C * C, O * O, dn2[1] + (C * C - dn2[1]) * alpha), C * C)

//Components
bull = math.sqrt(dn2 - dn1 * dn1)
bear = math.sqrt(up2 - up1 * up1)

signal = ta.ema(math.max(bull, bear), sig_length)

//-----------------------------------------------------------------------------}
//Plots
//-----------------------------------------------------------------------------{
plot(bull, 'Bullish Component', #089981)

plot(bear, 'Bearish Component', #f23645)

plot(signal, 'Signal', #ff9800)

//-----------------------------------------------------------------------------}