// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © unnoticed_owl

//@version=5
indicator("~Vol. Price Divergence", explicit_plot_zorder = true)


//---- Inputs

vol_fast_length = input( 7, "Fast Length")
vol_slow_length = input( 14, "Slow Length")
vol_normalization_length = input( 6, "Vol. Norm. Length")

col_vpfast = color.rgb(71, 99, 224)
col_vpslow = color.rgb(233, 78, 125)
col_price_rising = color.rgb(177, 177, 177)
col_price_falling = color.rgb(44, 44, 44)

//---- Functions

vol_price(v, p) => v * p

//----Normalization Function
n(s,l) =>
    hi = ta.highest(s, l) 
    lo = ta.lowest(s, l) 
    n = (s - lo) / (hi - lo)+1
    n


//---- Calculations

vol_fast = ta.ema(volume, vol_fast_length)
price_fast = ta.ema(close, vol_fast_length)
vp_fast = vol_price( vol_fast, price_fast )
ma_vp_fast = ta.sma( vp_fast, 3)

vol_slow = ta.ema( volume, vol_slow_length )
price_slow = ta.ema( close, vol_slow_length)
vp_slow = vol_price( vol_slow, price_slow )
ma_vp_slow = ta.sma(vp_slow, 3)

vp_difference = vp_fast - vp_slow


vol_normalized = n(volume, vol_normalization_length)
vol_normalized := (vol_normalized -1.5) * 2
ma_vol_normalized = ta.alma(vol_normalized, 12, .7, 6)

col_ma_vol = ma_vol_normalized > ma_vol_normalized[2] ? color.teal : ma_vol_normalized < ma_vol_normalized[2] ? color.maroon : color.gray


vol_difference = vol_fast - vol_slow

price_difference = price_fast - price_slow
price_difference_max = ta.highest( price_difference, vol_slow_length)
price_difference_min = ta.lowest( price_difference, vol_slow_length)
price_difference_normalized = ( price_difference - price_difference_min ) / ( price_difference_max - price_difference_min )
col_price_difference = color.from_gradient( price_difference_normalized, 0, 1, col_price_falling, col_price_rising)
//transparency_price_change = ()

//---- Plots
z1 = plot( ma_vol_normalized, color=col_ma_vol)
z2 = plot( ma_vol_normalized[2], color=col_ma_vol)
fill(z1, z2, color = col_ma_vol )


//plot(ma_vp_fast, color=col_vpfast, style = plot.style_line)
//plot(ma_vp_slow, color=col_vpslow, linewidth = 2)
//plot( vp_difference, color=color.rgb(0, 102, 255))

bgcolor( col_price_difference )