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//@version=5
indicator(title='RSI Bands', shorttitle='RSIB', overlay=true,timeframe="",   timeframe_gaps=true)

rsismoothlength = input(3, title='Smoothing EMA Length')
donchianmode = input(true, title='Donchian RSI Mode?')
channellength = input(20, title='Donchian Channel Length')
showbasis = input(true, title='Show Basis Line?')

obLevel1 = input(70, title='Fast RSI Overbought')
osLevel1 = input(30, title='Fast RSI Oversold')
length1 = input(5, title='Fast RSI Length')
src1 = input(high, title='Fast RSI Upper Source')
src1_2 = input(low, title='Fast RSI Lower Source')
ep = 2 * length1 - 1
auc1 = ta.ema(math.max(src1 - src1[1], 0), ep)
adc1 = ta.ema(math.max(src1[1] - src1, 0), ep)
auc1_2 = ta.ema(math.max(src1_2 - src1_2[1], 0), ep)
adc1_2 = ta.ema(math.max(src1_2[1] - src1_2, 0), ep)
x1 = (length1 - 1) * (adc1 * obLevel1 / (100 - obLevel1) - auc1)
ub1 = ta.ema(x1 >= 0 ? src1 + x1 : src1 + x1 * (100 - obLevel1) / obLevel1, rsismoothlength)
x2 = (length1 - 1) * (adc1_2 * osLevel1 / (100 - osLevel1) - auc1_2)
lb1 = ta.ema(x2 >= 0 ? src1_2 + x2 : src1_2 + x2 * (100 - osLevel1) / osLevel1, rsismoothlength)

obLevel2 = input(70, title='Mid RSI Overbought')
osLevel2 = input(30, title='Mid RSI Oversold')
length2 = input(8, title='Mid RSI Length')
src2 = input(high, title='Mid RSI Upper Source')
src2_2 = input(low, title='Mid RSI Lower Source')
ep_2 = 2 * length2 - 1
auc2 = ta.ema(math.max(src2 - src2[1], 0), ep_2)
adc2 = ta.ema(math.max(src2[1] - src2, 0), ep_2)
auc2_2 = ta.ema(math.max(src2_2 - src2_2[1], 0), ep_2)
adc2_2 = ta.ema(math.max(src2_2[1] - src2_2, 0), ep_2)
x1_2 = (length2 - 1) * (adc2 * obLevel2 / (100 - obLevel2) - auc2)
ub2 = ta.ema(x1_2 >= 0 ? src2 + x1_2 : src2 + x1_2 * (100 - obLevel2) / obLevel2, rsismoothlength)
x2_2 = (length2 - 1) * (adc2_2 * osLevel2 / (100 - osLevel2) - auc2_2)
lb2 = ta.ema(x2_2 >= 0 ? src2_2 + x2_2 : src2_2 + x2_2 * (100 - osLevel2) / osLevel2, rsismoothlength)

obLevel3 = input(70, title='Slow RSI Overbought')
osLevel3 = input(30, title='Slow RSI Oversold')
length3 = input(13, title='Slow RSI Length')
src3 = input(high, title='Slow RSI Upper Source')
src3_2 = input(low, title='Slow RSI Lower Source')
ep_3 = 2 * length3 - 1
auc3 = ta.ema(math.max(src3 - src3[1], 0), ep_3)
adc3 = ta.ema(math.max(src3[1] - src3, 0), ep_3)
auc3_2 = ta.ema(math.max(src3_2 - src3_2[1], 0), ep_3)
adc3_2 = ta.ema(math.max(src3_2[1] - src3_2, 0), ep_3)
x1_3 = (length3 - 1) * (adc3 * obLevel3 / (100 - obLevel3) - auc3)
ub3 = ta.ema(x1_3 >= 0 ? src3 + x1_3 : src3 + x1_3 * (100 - obLevel3) / obLevel3, rsismoothlength)
x2_3 = (length3 - 1) * (adc3_2 * osLevel3 / (100 - osLevel3) - auc3_2)
lb3 = ta.ema(x2_3 >= 0 ? src3_2 + x2_3 : src3_2 + x2_3 * (100 - osLevel3) / osLevel3, rsismoothlength)

midb = ta.ema(math.avg(ub3, lb3), rsismoothlength)
plot(showbasis ? midb : na, color=color.new(color.white, 0), title='basis')

highest_1 = ta.highest(ub1, channellength)
lxplot = plot(donchianmode ? highest_1 : ub1, color=color.new(color.black, 0), linewidth=1)
highest_2 = ta.highest(ub2, channellength)
l0plot = plot(donchianmode ? highest_2 : ub2, color=color.new(color.black, 0), linewidth=1)
highest_3 = ta.highest(ub3, channellength)
l1plot = plot(donchianmode ? highest_3 : ub3, color=color.new(color.black, 0), linewidth=1)

lowest_1 = ta.lowest(lb1, channellength)
l3plot = plot(donchianmode ? lowest_1 : lb1, color=color.new(color.black, 0), linewidth=1)
lowest_2 = ta.lowest(lb2, channellength)
l4plot = plot(donchianmode ? lowest_2 : lb2, color=color.new(color.black, 0), linewidth=1)
lowest_3 = ta.lowest(lb3, channellength)
l5plot = plot(donchianmode ? lowest_3 : lb3, color=color.new(color.black, 0), linewidth=1)

fill(lxplot, l0plot, title='Upper Zone 1', color=color.new(#313947, 25))
fill(l0plot, l1plot, title='Upper Zone 2', color=color.new(#313947, 50))
fill(l3plot, l4plot, title='Lower Zone 1', color=color.new(#000066, 25))
fill(l4plot, l5plot, title='Lower Zone 2', color=color.new(#000066, 50))