//@version=5

indicator(title="Relative Volatility Index", shorttitle="RVI", format=format.price, precision=2, timeframe="", timeframe_gaps=true)

length = input.int(10, minval=1)

offset = input.int(0, "Offset", minval = -500, maxval = 500)

maTypeInput = input.string("SMA", title="MA Type", options=["SMA", "Bollinger Bands", "EMA", "SMMA (RMA)", "WMA", "VWMA"], group="MA Settings")

maLengthInput = input.int(14, title="MA Length", group="MA Settings")

bbMultInput = input.float(2.0, minval=0.001, maxval=50, title="BB StdDev", group="MA Settings")

src = close

len = 14

stddev = ta.stdev(src, length)

upper = ta.ema(ta.change(src) <= 0 ? 0 : stddev, len)

lower = ta.ema(ta.change(src) > 0 ? 0 : stddev, len)

rvi = upper / (upper + lower) * 100

ma(source, length, type) =>

switch type

"SMA" => [ta.sma(source, length), na, na]

"Bollinger Bands" =>

[middleValue, highValue, lowValue] = ta.bb(source, length, bbMultInput)

[middleValue, highValue, lowValue]

"EMA" => [ta.ema(source, length), na, na]

"SMMA (RMA)" => [ta.rma(source, length), na, na]

"WMA" => [ta.wma(source, length), na, na]

"VWMA" => [ta.vwma(source, length), na, na]

[rviMA,highValue,lowValue] = ma(rvi, maLengthInput, maTypeInput)

h0 = hline(80, "Upper Band", color=#787B86)

hline(50, "Middle Band", color=color.new(#787B86, 50))

h1 = hline(20, "Lower Band", color=#787B86)

fill(h0, h1, color=color.rgb(126, 87, 194, 90), title="Background")

rviColor = rvi > rviMA ? color.green : color.red

plot(rvi, title="RVI", color=rviColor, offset = offset)

plot(rviMA, "RVI-based MA", color=color.yellow, offset = offset)

bbUpper = plot(highValue, title="Upper Bollinger Band", color=color.green)

bbLower = plot(lowValue, title="Lower Bollinger Band", color=color.green)

fill(bbUpper, bbLower, color = color.new(color.green, 90), title="Bollinger Bands Background Fill")