Make Modifications to Code so it Works in an Expert Advisor (Replace iBands with an Alternative)

Note: Value is high because I need this delivered in 12 hrs max. Project value will drop if it is delivered later.

I need this code:

//-----------------------
      double double_Bands_BASE_LINE__Bar_n = Index__Buffer(int_Index_Symb,int_Index_TF__n2,symb,TimeFrames_List__[ int_Index_TF__n2 ],BBPeriod_List__[int_Index_TF__n2], BBDeviation_List__[int_Index_TF__n2], 0,bar_1);
      double double_Bands_UPPER_BAND__Bar_n = Index__Buffer(int_Index_Symb,int_Index_TF__n2,symb,TimeFrames_List__[ int_Index_TF__n2 ],BBPeriod_List__[int_Index_TF__n2], BBDeviation_List__[int_Index_TF__n2], 1,bar_1);
      double double_Bands_LOWER_BAND__Bar_n = Index__Buffer(int_Index_Symb,int_Index_TF__n2,symb,TimeFrames_List__[ int_Index_TF__n2 ],BBPeriod_List__[int_Index_TF__n2], BBDeviation_List__[int_Index_TF__n2], 2,bar_1);

Replaced with this code:

   BufferSmoothPrice[bar_1]=(BufferSmoothPrice[bar_1+1]*(BBPeriod_List__[int_Index_TF__n2]-1)+iClose(symb,TimeFrames_List__[int_Index_TF__n2],bar_1))/BBPeriod_List__[int_Index_TF__n2];
   BufferSmoothRange[bar_1]=(BufferSmoothRange[bar_1+1]*(BBPeriod_List__[int_Index_TF__n2]-1)+iHigh(symb,TimeFrames_List__[int_Index_TF__n2],bar_1)-iLow(symb,TimeFrames_List__[int_Index_TF__n2],bar_1))/BBPeriod_List__[int_Index_TF__n2];

   BufferTop[bar_1]=BufferSmoothPrice[bar_1]+BufferSmoothRange[bar_1]*BBDeviation_List__[int_Index_TF__n2];
   BufferBottom[bar_1]=BufferSmoothPrice[bar_1]-BufferSmoothRange[bar_1]*BBDeviation_List__[int_Index_TF__n2];
   BufferMiddle[bar_1]=BufferSmoothPrice[bar_1];

I will share the rest of the code, watch this video description first: