Convert TradingView indicator to MT4

Here is the script from trading view

//@version=3

study(title="ATR Smoothed (By dysrupt)_BuySell version", shorttitle="ATR_SM_BuySell", overlay = true)

//Modifyed by @guikroth

////////////////////////////////////////////////////////////////////////////////INPUTS

nATRPeriod      = input(21, "Period")

nATRMultip      = input(6.3, "Multiplier",type=float, minval=0.5, maxval=1000, step=0.1)

/////////////////////////////////////////////////////////////////////////////////ATR

xATR = atr(nATRPeriod)

nLoss = nATRMultip * xATR

xATRTrailingStop = na

xATRTrailingStop := 

 iff(close > nz(xATRTrailingStop[1], 0) and close[1] > nz(xATRTrailingStop[1], 0), max(nz(xATRTrailingStop[1]), close - nLoss),

  iff(close < nz(xATRTrailingStop[1], 0) and close[1] < nz(xATRTrailingStop[1], 0), min(nz(xATRTrailingStop[1]), close + nLoss), 

   iff(close > nz(xATRTrailingStop[1], 0), close - nLoss, close + nLoss))) 

pos = na 

pos := 

 iff(close[1] < nz(xATRTrailingStop[1], 0) and close > nz(xATRTrailingStop[1], 0), 1, 

  iff(close[1] > nz(xATRTrailingStop[1], 0) and close < nz(xATRTrailingStop[1], 0), -1, nz(pos[1], 0)))

color = pos == -1 ? red: pos == 1 ? lime : blue 

//patr=plot(xATRTrailingStop, color=color, linewidth=2, title="ATR Trailing Stop", transp=0)

// 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)

//Trading

// Buy only if the buy signal is triggered and we are not already long

LONG = not isLong and pos == 1

// Sell only if the sell signal is triggered and we are not already short   

SHORT = not isShort and pos == -1

if (LONG)

    isLong := true

    isShort := false

if (SHORT)

    isLong := false

    isShort := true

barcolor(isLong ? lime : isShort ? red : na)

// Show Break Alerts

plotshape(SHORT, title="Sell", style=shape.labeldown, location=location.abovebar, size=size.normal, text="Sell", transp=0, textcolor = white, color=red, transp=0)

plotshape(LONG, title="Buy", style=shape.labelup, location=location.belowbar, size=size.normal, text="Buy", textcolor = white, color=green, transp=0)

// === /PLOTTING ===

// Send alert to TV alarm sub-system

alertcondition(LONG,title="Sell",message="Sell")

alertcondition(SHORT,title="BuY",message="Buy")

alertcondition(SHORT,title="BuY",message="Buy")

alertcondition(SHORT,title="BuY",message="Buy")

////////////////////////////////////////////////////////////////////////////////VWMA

len2 = input(100, minval=1, title="Smooth")

src = input(close, title="Source")

out = vwma(src, len2)

avg1=avg(out, xATRTrailingStop)

plot(avg1, color=aqua, transp=0, title="ATR")