// Licensed under the Apache License, Version 2.0
// © mihakralj
//@version=6
indicator("Price Volume Trend (PVT)", "PVT", overlay=false)

//@function Calculates Price Volume Trend, cumulative volume adjusted by relative price changes
//@param src Source price for calculation (typically close)
//@param src_vol Volume data
//@returns float The cumulative PVT value
pvt(series float src, series float src_vol) =>
    float price_change = src - nz(src[1], src)
    float price_prev = nz(src[1], src)
    float price_change_ratio = price_prev != 0 ? price_change / price_prev : 0.0
    float volume_adjustment = nz(src_vol, 0.0) * price_change_ratio
    var float cumulative_pvt = 0.0
    cumulative_pvt += volume_adjustment
    cumulative_pvt

// ---------- Main Calculation ----------

// Parameters - PVT typically doesn't need input parameters as it's cumulative

// Calculation
pvt_line = pvt(close, volume)

// ---------- Plots ----------

plot(pvt_line, "PVT", color.yellow, 2)
hline(0, "Zero Line", color.gray, linestyle=hline.style_dashed)

// Signal line (optional smoothed version)
signal_length = input.int(14, "Signal Line Period", minval=1)
pvt_signal = ta.sma(pvt_line, signal_length)
plot(pvt_signal, "PVT Signal", color.red, 1)

// Background coloring for trend indication
bgcolor(pvt_line > pvt_signal ? color.green : color.red)