// Licensed under the Apache License, Version 2.0
// © mihakralj
//@version=6
indicator("Accumulation/Distribution Line (AD)", "AD", overlay=false)

//@function Calculates the Accumulation/Distribution Line (AD), a volume-based indicator that measures money flow into and out of a security
//@param src_high The high price (default: built-in high)
//@param src_low The low price (default: built-in low)
//@param src_close The close price (default: built-in close)
//@param src_vol The volume (default: built-in volume)
//@returns The cumulative AD value representing buying/selling pressure
ad(src_high = high, src_low = low, src_close = close, src_vol = volume) =>
    float mfm = 0.0
    if not na(src_high) and not na(src_low) and not na(src_close)
        mfm := (src_close - src_low) - (src_high - src_close)
        mfm := src_high != src_low ? mfm / (src_high - src_low) : 0.0
    float mfv = na(src_vol) ? 0.0 : src_vol * mfm
    var float cumulativeSum = 0.0
    cumulativeSum := na(mfv) ? cumulativeSum : cumulativeSum + mfv
    cumulativeSum

// ---------- Inputs ----------

// ---------- Calculations ----------
ad_val = ad(high, low, close, volume)

// ---------- Plotting ----------
plot(ad_val, "AD", color=color.yellow, linewidth=2)