//@version=5
indicator("Volume Flow Indicator [birdsongs]", shorttitle="Volume Flow [birdsongs]", overlay=false)  // Set overlay to false

// User inputs for customization
length = input.int(50, "VFI Length", title="Length of the moving average for VFI calculation")
cutoffMultiplier = input.float(0.2, "Cutoff Multiplier", step=0.01, title="Multiplier to adjust the sensitivity of volume cutoff")
smooth = input.int(3, "Smoothing Length", title="Number of periods for smoothing the VFI")

// Calculate Typical Price and Volume Force
typicalPrice = (high + low + close) / 3
vForce = volume * (typicalPrice - nz(typicalPrice[1])) / ta.atr(length)

// Calculate Cutoff based on the average true range
cutoff = ta.atr(length) * cutoffMultiplier

// Initialize array to store values
var float[] forces = array.new_float(0)

// Fill the array with volume force values that exceed the cutoff
if array.size(forces) >= length
    array.shift(forces)
array.push(forces, math.abs(vForce) > cutoff ? vForce : 0)

// Calculate the VFI
vfi = array.sum(forces) / volume

// Smooth the VFI for better visualization
smoothedVfi = ta.sma(vfi, smooth)

// Plotting the VFI as an overlay on the price chart
plot(smoothedVfi, "Smoothed VFI", color=color.blue)
hline(0, "Zero Line", color=color.gray)

// Optional: Change background color to indicate strong positive trends only
bgcolor(smoothedVfi > 1 ? color.new(color.green, 90) : na, title="Trend Background")