//@version=5
indicator(title='Maestro - Crescendo', shorttitle='Maestro - Crescendo', timeframe='')
smma(src, length) =>
    smma =  0.0
    curr_smma = ta.sma(src, length) 
    smma := na(smma[1]) ? curr_smma : (smma[1] * (length - 1) + src) / length
    smma
// Getting inputs
fast_length = input(title='Fast', defval=10)
slow_length = input(title='Slow', defval=50)
src         = input(title='Calculation', defval=close)
ma_offset   = input(title='MA Offset', defval=0)
sma_source  = input.string(title='Oscillator Type', defval='EMA', options=['SMA', 'EMA', 'SMMA'])
// Plot colors
col_grow_above = color(#26A69A50)
col_fall_above = color(#B2DFDB50)
col_grow_below = color(#FFCDD250)
col_fall_below = color(#FF525250)
// Calculating
fast_ma = sma_source == 'SMA' ? ta.sma(src, fast_length) : sma_source == 'EMA' ? ta.ema(src, fast_length) : smma(src, fast_length)
slow_ma = sma_source == 'SMA' ? ta.sma(src, slow_length) : sma_source == 'EMA' ? ta.ema(src, slow_length) : smma(src, slow_length)
speed = fast_ma - slow_ma
lineColor = color.green
if speed <= 0
    lineColor := color.red
x1 = plot(speed, title='Upper', color=lineColor, linewidth=4, offset=ma_offset, editable=false)
speedm = speed * -1
x2 = plot(speedm, title='Lower', color=lineColor, linewidth=4, offset=ma_offset, editable=false)

fill(x1, x2, editable=false, color=speed >= 0 ? speed[1] < speed ? col_grow_above : col_fall_above : speed[1] < speed ? col_grow_below : col_fall_below)