converting bollinger code from MT4 to MT5!

Hi Community! Hope all's well!! Just slightly struggling with converting a piece of code(Bollinger Band and MA of the same) from back in the day in MQL4 to MQL5. Will be highly appreciated. Thanks much!!

  RefreshRates();  
 // GETTING THE AMOUNT OF ALL BARS OF THE CHART
   int IBARSA = iBars(NULL,A_TF);
//---- Checking whether the bars number is enough for further calculation
   if(IBARSA < A_MA)
    return(0);
// INDICATOR BUFFERS EMULATION
  if(ArraySize(BandWidthA) < IBARSA)
     {
       ArraySetAsSeries(BandWidthA, false);
       ArraySetAsSeries(MainA, false);
       ArraySetAsSeries(PercentA, false);
       //----  
       ArrayResize(BandWidthA, IBARSA); 
       ArrayResize(MainA, IBARSA);
       ArrayResize(PercentA, IBARSA);  
       //----
       ArraySetAsSeries(BandWidthA, true);
       ArraySetAsSeries(MainA, true);
       ArraySetAsSeries(PercentA, true); 
     }
// INSERTION OF A STATIC INTEGER MEMORY VARIABLE
   static int IndCountedA;  
//----+ Insertion of integer variables and GETTING ALREADY CALCULATED BARS 
   int A, MaxBarA, barA, counted_barsA = IndCountedA;
//---- checking for possible errors
   if(counted_barsA < 0)
    return(-1);
//---- the last calculated bar must be recalculate
   if(counted_barsA > 0) 
       counted_barsA--;
//----+ REMEMBERING THE AMOUNT OF ALL BARS OF THE CHART
   IndCountedA = IBARSA - 1;
//---- defining the number of the oldest bar,   
//---- starting from which new bars will be recalculated
   A = IBARSA - counted_barsA - 1; 
//---- defining the number of the oldest bar, 
//---- starting from which new bars will be recalculated
   MaxBarA = IBARSA - 1 - A_MA;
//---- initialization to zero
   if(A > MaxBarA)
     {
       A = MaxBarA;
       for(barA = IBARSA - 1; barA >= 0; barA--)
         {
           BandWidthA[barA] = 0.0;
           MainA[barA] = 0.0;
           PercentA[barA]=0.0;
          
         }
     }
//------MAIN CYCLE
 //---------------------1     
    for(int a = IBARSA-1; a >= 0; a--)
      {
        double UpperBandA = iBands(NULL,A_TF,A_MA,Deviation,Shift,2,MODE_UPPER, a);
        double LowerBandA = iBands(NULL,A_TF,A_MA,Deviation,Shift,3,MODE_LOWER, a);
        double MiddlBandA = iBands(NULL,A_TF,A_MA,Deviation,Shift,4,MODE_MAIN,  a);
        double DenominatA = UpperBandA - LowerBandA;
       
         if( MiddlBandA == 0.0 ) { MiddlBandA = 0.00001; }
         if( DenominatA == 0.0 ) { DenominatA = 0.00001; }
        
      
      BandWidthA[a] = ( UpperBandA - LowerBandA ) / MiddlBandA;
      PercentA[a] = (Close[a]-LowerBandA)/DenominatA;
    
      //----
      }
      
    while(A>=0)
   {
      //----
      MainA[A]  = iMAOnArray(BandWidthA,0,A_MAMA,Shift,MODE_SMA, A);
      //----
      A--;
   }
   A_PerCent=PercentA[0];
   double A_Diff=BandWidthA[0]-MainA[0];
   Print(" A Diff strength,,,   ",A_Diff);