SuperTrend + MACD + EMA

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © macmwz20


//@version=5
indicator('SuperTrend + MACD + EMA', overlay=true)

src = close
fast_ema = ta.ema(src, 9)
slow_ema = ta.ema(src, 18)

fast_macd = ta.ema(src, 12)
slow_macd = ta.ema(src, 26)
macd = fast_macd - slow_macd
signal = ta.ema(macd, 9)
hist = macd - signal

// Volume Filter
volume_ma = ta.sma(volume, 20)
volume_increase = volume > volume_ma

// Deternine if we are currently LONG
isLong = false
isLong := nz(isLong[1], false)

// Determine if we are currently SHORT
isShort = false
isShort := nz(isShort[1], false)

// Buy only if the buy signal is triggered, we are not already long, and volume is high
LONG = not isLong and fast_ema > slow_ema and macd > signal and volume_increase

// Sell only if the sell signal is triggered, we are not already short, and volume is high
SHORT = not isShort and fast_ema < slow_ema and macd < signal and volume_increase

if LONG
    isLong := true
    isShort := false
    isShort

if SHORT
    isLong := false
    isShort := true
    isShort

// Supertrend Calculation
atr = 3 * ta.atr(10)
longStop = hl2 - atr
longStopPrev = nz(longStop[1], longStop)
longStop := close[1] > longStopPrev ? math.max(longStop, longStopPrev) : longStop
shortStop = hl2 + atr
shortStopPrev = nz(shortStop[1], shortStop)
shortStop := close[1] < shortStopPrev ? math.min(shortStop, shortStopPrev) : shortStop
dir = 1
dir := nz(dir[1], dir)
dir := dir == -1 and close > shortStopPrev ? 1 : dir == 1 and close < longStopPrev ? -1 : dir


// Line Plots
bodyMiddle = plot((open + close) / 2, display=display.none)
upTrend = plot(dir == 1 ? longStop : na, title='Up Trend Line', style=plot.style_linebr, linewidth=1, color=color.new(color.green, 0))
downTrend = plot(dir != 1 ? shortStop : na, title='Down Trend Line', style=plot.style_linebr, linewidth=1, color=color.new(color.red, 0))

//Fill Background
fill(bodyMiddle, upTrend, color.new(color.green, 90), fillgaps=false, title='Uptrend Background')
fill(bodyMiddle, downTrend, color.new(color.red, 90), fillgaps=false, title='Downtrend Background')

//Bar Colour
barcolor(dir == 1 and isLong ? color.green : dir != 1 and isShort ? color.red : color.blue)

// Buy/Sell Label Plots
confirmLONG = fast_ema > slow_ema and macd > signal and longStop
confirmSHORT = fast_ema > slow_ema and macd > signal and longStop
plotshape(not confirmLONG[1] and confirmLONG, title='Buy Label', style=shape.labelup, location=location.belowbar, size=size.normal, text='Buy', textcolor=color.new(color.white, 0), color=color.new(color.green, 0))
plotshape(not confirmSHORT[1] and confirmSHORT, title='Sell Label', style=shape.labeldown, location=location.abovebar, size=size.normal, text='Sell', textcolor=color.new(color.white, 0), color=color.new(color.red, 0))