VIDYA Crossover with ADX Filter

// This Pine Script® code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © sampathtrades42

//@version=6

// @description TODO: add library description here
//library("SamsLibrary")

//@version=5
indicator("VIDYA Crossover with ADX Filter", overlay=true)

// --- VIDYA Function ---
calc_vidya(len) =>
    float src = close
    float mom = ta.change(src)
    float sum_pos = math.sum(mom > 0 ? mom : 0, len)
    float sum_neg = math.sum(mom < 0 ? -mom : 0, len)
    float cmo = math.abs((sum_pos - sum_neg) / (sum_pos + sum_neg))
    float alpha = 2 / (len + 1)
    
    var float vidya = na
    vidya := na(vidya[1]) ? src : (alpha * cmo * src) + (1 - alpha * cmo) * vidya[1]
    vidya

// --- Inputs ---
short_len = input.int(9, "Short VIDYA Length")
long_len  = input.int(21, "Long VIDYA Length")
adx_len   = input.int(15, "ADX Period")
adx_smooth = input.int(15, "ADX Smoothing")
adx_threshold = input.int(25, "DI Threshold")

// --- Calculations ---
vidya9  = calc_vidya(short_len)
vidya21 = calc_vidya(long_len)

// ADX & DI Components
[plusDI, minusDI, adxValue] = ta.dmi(adx_len, adx_smooth)

// --- Signal Logic ---
vidya_cross_up   = ta.crossover(vidya9, vidya21)
vidya_cross_down = ta.crossunder(vidya9, vidya21)

buy_signal  = vidya_cross_up and plusDI > adx_threshold
sell_signal = vidya_cross_down and minusDI > adx_threshold

// --- Plotting ---
plot(vidya9, color=color.aqua, title="VIDYA 9")
plot(vidya21, color=color.orange, title="VIDYA 21")

// --- Labels ---
if buy_signal
    label.new(bar_index, low, "BUY_CALL_SELL_PUT", color=color.green, textcolor=color.white, style=label.style_label_up, yloc=yloc.belowbar)

if sell_signal
    label.new(bar_index, high, "SELL_CALL_BUY_PUT", color=color.red, textcolor=color.white, style=label.style_label_down, yloc=yloc.abovebar)

// --- Alerts ---
alertcondition(buy_signal, title="Bullish Signal", message="VIDYA Cross Up + DI Plus High")
alertcondition(sell_signal, title="Bearish Signal", message="VIDYA Cross Down + DI Minus High")