//+------------------------------------------------------------------+
//   GannHiLo-Histo
//+------------------------------------------------------------------+
// Indicator properties
#property copyright ""
#property link      ""

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 RoyalBlue
#property indicator_color2 Crimson
#property indicator_width1  4
#property indicator_width2  4
#property indicator_maximum 1
#property indicator_minimum 0

// indicator parameters
extern string TimeFrame = "Current time frame";
extern int    LookBack    = 10;

// indicator buffers
double up_buffer[];
double dn_buffer[];
double ghl_buffer[];

string indicatorFileName;
bool   returnBars;
int    timeFrame;

//+------------------------------------------------------------------+
int init() {
  IndicatorBuffers(3); 
  SetIndexStyle(0,DRAW_HISTOGRAM);
  SetIndexBuffer(0,up_buffer);
  SetIndexLabel(0,NULL);
  SetIndexStyle(1,DRAW_HISTOGRAM);
  SetIndexBuffer(1,dn_buffer);
  SetIndexLabel(1,NULL);
  SetIndexBuffer(2,ghl_buffer);
  SetIndexLabel(2,NULL);
  indicatorFileName = WindowExpertName();
  returnBars        = TimeFrame == "returnBars";     if (returnBars)     return(0);
  timeFrame         = stringToTimeFrame(TimeFrame);
  IndicatorShortName(timeFrameToString(timeFrame)+" Gann HiLo");
  return(0);
}

//+------------------------------------------------------------------+
int deinit() {
   return (0);
}


//+------------------------------------------------------------------+
int start() 
{
   int counted_bars=IndicatorCounted();
      if(counted_bars<0) return(-1);
      if(counted_bars>0) counted_bars--;
           int limit=MathMin(Bars-counted_bars,Bars-1);
           if (returnBars) { up_buffer[0] = limit+1; return(0); }
   
            if (timeFrame!=Period())
            {
               limit = MathMax(limit,MathMin(Bars-1,iCustom(NULL,timeFrame,indicatorFileName,"returnBars",0,0)*timeFrame/Period()));
               for (int i=limit; i>=0; i--)
               {
                   int y = iBarShift(NULL,timeFrame,Time[i]);               
                      up_buffer[i] = iCustom(NULL,timeFrame,indicatorFileName,"calculateValue",LookBack,0,y);
                      dn_buffer[i] = iCustom(NULL,timeFrame,indicatorFileName,"calculateValue",LookBack,1,y);
               }
               return(0);
            }
  
  if(counted_bars==0) counted_bars=2;
  limit=MathMax(Bars-counted_bars,LookBack);
  limit=Bars-counted_bars;
  
  //for (i=0; i<limit; i++) {
  for (i=limit; i>=0; i--) {
    ghl_buffer[i]=ghl_buffer[i+1];
    
    if (Close[i]==0)
      ghl_buffer[i]=EMPTY_VALUE;
    else if(Close[i]>iMA(Symbol(),0,LookBack,0,MODE_SMA,PRICE_HIGH,i+1))
      ghl_buffer[i]=1;
    else if(Close[i]<iMA(Symbol(),0,LookBack,0,MODE_SMA,PRICE_LOW,i+1))
      ghl_buffer[i]=-1;
    
    
    up_buffer[i] = EMPTY_VALUE;
    dn_buffer[i] = EMPTY_VALUE;
    
    if (ghl_buffer[i]==1) {
      up_buffer[i] = 1;
      dn_buffer[i] = 0;
    }
    else if (ghl_buffer[i]==-1){
      dn_buffer[i] = 1;
      up_buffer[i] = 0;
    }
    
  }
  return(0);
}

//-------------------------------------------------------------------
//
//-------------------------------------------------------------------
//
//
//
//
//

string sTfTable[] = {"M1","M5","M15","M30","H1","H4","D1","W1","MN"};
int    iTfTable[] = {1,5,15,30,60,240,1440,10080,43200};

//
//
//
//
//

int stringToTimeFrame(string tfs)
{
   tfs = stringUpperCase(tfs);
   for (int i=ArraySize(iTfTable)-1; i>=0; i--)
         if (tfs==sTfTable[i] || tfs==""+iTfTable[i]) return(MathMax(iTfTable[i],Period()));
                                                      return(Period());
}
string timeFrameToString(int tf)
{
   for (int i=ArraySize(iTfTable)-1; i>=0; i--) 
         if (tf==iTfTable[i]) return(sTfTable[i]);
                              return("");
}

//
//
//
//
//

string stringUpperCase(string str)
{
   string   s = str;

   for (int length=StringLen(str)-1; length>=0; length--)
   {
      int tchar = StringGetChar(s, length);
         if((tchar > 96 && tchar < 123) || (tchar > 223 && tchar < 256))
                     s = StringSetChar(s, length, tchar - 32);
         else if(tchar > -33 && tchar < 0)
                     s = StringSetChar(s, length, tchar + 224);
   }
   return(s);
}