[SHK] Schaff Trend Cycle (STC)

//@version=5
//[SHK] STC colored indicator
//https://www.tradingview.com/u/shayankm/

indicator(title='[SHK] Schaff Trend Cycle (STC)', shorttitle='STC', overlay=false)
EEEEEE = input(12, 'Length')
BBBB = input(26, 'FastLength')
BBBBB = input(50, 'SlowLength')

AAAA(BBB, BBBB, BBBBB) =>
    fastMA = ta.ema(BBB, BBBB)
    slowMA = ta.ema(BBB, BBBBB)
    AAAA = fastMA - slowMA
    AAAA

AAAAA(EEEEEE, BBBB, BBBBB) =>
    AAA = input(0.5)
    var CCCCC = 0.0
    var DDD = 0.0
    var DDDDDD = 0.0
    var EEEEE = 0.0
    BBBBBB = AAAA(close, BBBB, BBBBB)
    CCC = ta.lowest(BBBBBB, EEEEEE)
    CCCC = ta.highest(BBBBBB, EEEEEE) - CCC
    CCCCC := CCCC > 0 ? (BBBBBB - CCC) / CCCC * 100 : nz(CCCCC[1])
    DDD := na(DDD[1]) ? CCCCC : DDD[1] + AAA * (CCCCC - DDD[1])
    DDDD = ta.lowest(DDD, EEEEEE)
    DDDDD = ta.highest(DDD, EEEEEE) - DDDD
    DDDDDD := DDDDD > 0 ? (DDD - DDDD) / DDDDD * 100 : nz(DDDDDD[1])
    EEEEE := na(EEEEE[1]) ? DDDDDD : EEEEE[1] + AAA * (DDDDDD - EEEEE[1])
    EEEEE

mAAAAA = AAAAA(EEEEEE, BBBB, BBBBB)
mColor = mAAAAA > mAAAAA[1] ? color.new(color.green, 20) : color.new(color.red, 20)
_mColor = mAAAAA > mAAAAA[1]
alertcondition((not _mColor[1] and _mColor), "Red to Green", "Red to Green")
alertcondition((_mColor[1] and not _mColor), "Green to Red", "Green to Red")


if mAAAAA[3] <= mAAAAA[2] and mAAAAA[2] > mAAAAA[1] and mAAAAA > 75
    alert("Red", alert.freq_once_per_bar)
if mAAAAA[3] >= mAAAAA[2] and mAAAAA[2] < mAAAAA[1] and mAAAAA < 25
    alert("Green", alert.freq_once_per_bar)


plot(mAAAAA, color=mColor, title='STC', linewidth=2)

ul = plot(25, color=color.new(color.gray, 70))
ll = plot(75, color=color.new(color.gray, 70))
fill(ul, ll, color=color.new(color.gray, 96))