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//@version=5
indicator(title="[NB] - Indicator - Mult Type Double Moving Averages", shorttitle = "[NB]IND.MultTypeDoubleMAs", overlay = true)

// inputs

maLenF = input.int(defval = 74, step = 1, title = "Length", group = "Fast Moving Average")
maSrcF = input(defval = close, title = "Source", group = "Fast Moving Average")
maTpF = input.string(defval = "SMA", options = ["EMA", 'HMA', 'RMA', 'SMA', 'SWMA', 'VWAP', 'VWMA', 'WMA'], title = "Type", group = "Fast Moving Average")

maLenS = input.int(defval = 32, step = 1, title = "Length", group = "Slow Moving Average")
maSrcS = input(defval = close, title = "Source", group = "Slow Moving Average")
maTpS = input.string(defval = "SMA", options = ["EMA", 'HMA', 'RMA', 'SMA', 'SWMA', 'VWAP', 'VWMA', 'WMA'], title = "Type", group = "Slow Moving Average")

selectMa(TypeF, srcF, lenF)=>
    if TypeF == "SMA"
        selectMa = ta.sma(srcF, lenF)
    else
        if TypeF == "EMA"
            selectMa = ta.ema(srcF, lenF)
        else
            if TypeF == "RMA"
                selectMa = ta.rma(srcF, lenF)
            else
                if TypeF == "WMA"
                    selectMa = ta.wma(srcF, lenF)
                else
                    if TypeF == "VWMA"
                        selectMa = ta.vwma(srcF, lenF)
                    else
                        if TypeF == "HMA"
                            selectMa = ta.hma(srcF, lenF)
                        else
                            if TypeF == "SWMA"
                                selectMa = ta.swma(srcF)
                            else
                                if TypeF == "VWAP"
                                    selectMa = ta.vwap(srcF, lenF)
                                else
                                    na



fastMa = selectMa(maTpF, maSrcF, maLenF)
slowMa = selectMa(maTpS, maSrcS, maLenS)

plot(fastMa, color = color.fuchsia, title = "Fast MA")
plot(slowMa, color = color.white, title = "Slow MA")

bullCross = ta.crossover(fastMa, slowMa)
bearCross = ta.crossunder(fastMa, slowMa)

if bullCross
    alert(syminfo.ticker + "Fast MA crossing OVER Slow MA",freq = alert.freq_once_per_bar_close)

if bearCross
    alert(syminfo.ticker + "Fast MA crossing UNDER Slow MA",freq = alert.freq_once_per_bar_close)