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// The top of every source code file must include this line
#include <math.h>
#include "sierrachart.h"

// This line is required. Change the text within the quote
// marks to what you want to name your group of custom studies.
SCDLLName("ehlTMABands")

SCSFExport scsf_ehlTMABands(SCStudyInterfaceRef sc)
{
  // Reference the Plots and the inputs
  SCSubgraphRef   midBand  = sc.Subgraph[0];
  SCSubgraphRef   topBand = sc.Subgraph[1];
  SCSubgraphRef   lowBand = sc.Subgraph[2];

  SCFloatArrayRef sma = midBand.Arrays[0];
  SCFloatArrayRef iatr = midBand.Arrays[1];

  SCInputRef     HalfLength    = sc.Input[0];
  SCInputRef     ATRPeriod    = sc.Input[1];
  
  if (sc.SetDefaults)
  {
  // Section 1 - Set the configuration variables and defaults
    sc.GraphName       = "ehlTMAbands"; // Name in study overview
    sc.StudyDescription   = "TMA Bands Indicator";    
        
    sc.GraphRegion       = 0;  // Set the Chart Region to draw the graph in. Region 0 is the main price graph
    sc.FreeDLL         = 1;  // During dev set this flag to 1, so DLL can be rebuilt without restarting Sierra
    sc.AutoLoop       = 0;  //Auto looping is enabled.
    
  // Reference the Plots and the inputs and define them
    midBand.Name = "midBand";
    midBand.DrawStyle = DRAWSTYLE_LINE;      // Look in scconstants.h for other draw styles
    midBand.PrimaryColor = RGB(0, 128, 0);    // Red  
    midBand.LineWidth = 2;

    topBand.Name = "topBand";
    topBand.DrawStyle = DRAWSTYLE_POINT;    // Look in scconstants.h for other draw styles
    topBand.PrimaryColor = RGB(255, 0, 0);    // Light Green  
    topBand.LineWidth = 1;

    lowBand.Name = "lowBand";
    lowBand.DrawStyle = DRAWSTYLE_POINT;    // Look in scconstants.h for other draw styles
    lowBand.PrimaryColor = RGB(0, 128, 0);    // Green  
    lowBand.LineWidth = 1;
    
    HalfLength.Name = "Length";
    HalfLength.SetInt(20);
    HalfLength.SetIntLimits(1, 300);

    ATRPeriod.Name = "Forecast";
    ATRPeriod.SetInt(100);
    ATRPeriod.SetIntLimits(1, INT_MAX);
    return;
  }
  // Section 2 - Do data processing here
  float dSum, sumw;
  int j = 1, k, limit;
  int intHalfLength = HalfLength.GetInt();
  int intATRPeriod = ATRPeriod.GetInt();
  limit = sc.ArraySize - 1;
    
  for (int i = 0; i < sc.ArraySize; i++)
  //for (int i = sc.UpdateStartIndex; i < sc.ArraySize; i++)
  {
    dSum = (intHalfLength + 1) * sc.BaseDataIn[SC_LAST][i];
    sumw = (intHalfLength + 1);

    for (j = 1, k = intHalfLength; j <= intHalfLength; j++, k--)
    {
      if (i + j >= sc.ArraySize) break;
      
      dSum += k * sc.BaseDataIn[SC_LAST][i + j];
      sumw += k;

      if (j <= i)
      {
        dSum += k * sc.BaseDataIn[SC_LAST][i - j];
        sumw += k;
      }
    }
    midBand[i] = (dSum / sumw) ;

    float ATR = sc.Subgraph[4][i];
    topBand[i] = midBand[i] + (2 * ATR);
    lowBand[i] = midBand[i] - (2 * ATR); // ATR;
  }    
    return;
      
}