//+------------------------------------------------------------------+
//|                                              Hull moving average |
//|                                                           mladen |
//+------------------------------------------------------------------+
#property copyright "www.forex-tsd.com"
#property link      "www.forex-tsd.com"

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1  LimeGreen
#property indicator_color2  Red
#property indicator_width1  3
#property indicator_width2  3
#property indicator_minimum 0
#property indicator_maximum 1

//
//
//
//
//

extern string TimeFrame       = "Current time frame";
extern int    HMAPeriod       = 35;
extern int    HMAPrice        = PRICE_CLOSE;
extern double HMASpeed        = 2.0;
extern bool   alertsOn        = false;
extern bool   alertsOnCurrent = true;
extern bool   alertsMessage   = true;
extern bool   alertsSound     = false;
extern bool   alertsEmail     = false;


//
//
//
//
//

double hma[];
double hmada[];
double hmadb[];
double work[];
double trend[];

int    HalfPeriod;
int    HullPeriod;

string indicatorFileName;
bool   returnBars;
bool   calculateValue;
int    timeFrame;

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

int init()
{
   IndicatorBuffers(5);
      SetIndexBuffer(0,hmada);SetIndexStyle(0,DRAW_HISTOGRAM);
      SetIndexBuffer(1,hmadb);SetIndexStyle(1,DRAW_HISTOGRAM);
      SetIndexBuffer(2,hma);
      SetIndexBuffer(3,trend);
      SetIndexBuffer(4,work);
      
   //
   //
   //
   //
   //
         
      HMAPeriod  = MathMax(2,HMAPeriod);
      HalfPeriod = MathFloor(HMAPeriod/HMASpeed);
      HullPeriod = MathFloor(MathSqrt(HMAPeriod));

         indicatorFileName = WindowExpertName();
         calculateValue    = TimeFrame=="calculateValue"; if (calculateValue) { return(0); }
         returnBars        = TimeFrame=="returnBars";     if (returnBars)     { return(0); }
         timeFrame         = stringToTimeFrame(TimeFrame);

   //
   //
   //
   //
   //
   
   IndicatorShortName(timeFrameToString(timeFrame)+" HMA ("+HMAPeriod+")");
   return(0);
}


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

int start()
{
   int i,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) { hma[0] = MathMin(limit+1,Bars-1); return(0); }

   //
   //
   //
   //
   //

   if (calculateValue || timeFrame == Period())
   {
      for(i=limit; i>=0; i--) work[i] = 2.0*iMA(NULL,0,HalfPeriod,0,MODE_LWMA,HMAPrice,i)-iMA(NULL,0,HMAPeriod,0,MODE_LWMA,HMAPrice,i);
      for(i=limit; i>=0; i--)
      {
         hma[i]   = iMAOnArray(work,0,HullPeriod,0,MODE_LWMA,i);
         hmada[i] = EMPTY_VALUE;
         hmadb[i] = EMPTY_VALUE;
         trend[i] = trend[i+1];
            if (hma[i] > hma[i+1]) trend[i] =  1;
            if (hma[i] < hma[i+1]) trend[i] = -1;
            if (trend[i] == 1) hmada[i] = 1;
            if (trend[i] ==-1) hmadb[i] = 1;
      }      
      manageAlerts();
      return(0);
   }
   
   //
   //
   //
   //
   //

   limit = MathMax(limit,MathMin(Bars-1,iCustom(NULL,timeFrame,indicatorFileName,"returnBars",0,0)*timeFrame/Period()));
   for (i=limit; i>=0; i--)
   {
      int y = iBarShift(NULL,timeFrame,Time[i]);
         trend[i] = iCustom(NULL,timeFrame,indicatorFileName,"calculateValue",HMAPeriod,HMAPrice,HMASpeed,3,y);
         hmada[i] = EMPTY_VALUE;
         hmadb[i] = EMPTY_VALUE;
         if (trend[i] == 1) hmada[i] = 1;
         if (trend[i] ==-1) hmadb[i] = 1;
   }
   manageAlerts();
return(0);       
}

//+-------------------------------------------------------------------
//|                                                                  
//+-------------------------------------------------------------------
//
//
//
//
//

void manageAlerts()
{
   if (!calculateValue && alertsOn)
   {
      if (alertsOnCurrent)
           int whichBar = 0;
      else     whichBar = 1; whichBar = iBarShift(NULL,0,iTime(NULL,timeFrame,whichBar));
      if (trend[whichBar] != trend[whichBar+1])
      {
         if (trend[whichBar] ==  1) doAlert(whichBar,"up");
         if (trend[whichBar] == -1) doAlert(whichBar,"down");
      }
   }
}

//
//
//
//
//

void doAlert(int forBar, string doWhat)
{
   static string   previousAlert="nothing";
   static datetime previousTime;
   string message;
   
   if (previousAlert != doWhat || previousTime != Time[forBar]) {
       previousAlert  = doWhat;
       previousTime   = Time[forBar];

       //
       //
       //
       //
       //

       message =  Symbol()+" "+timeFrameToString(timeFrame)+" at "+TimeToStr(TimeLocal(),TIME_SECONDS)+" HMA trend changed to "+doWhat;
          if (alertsMessage) Alert(message);
          if (alertsEmail)   SendMail(Symbol()+" HMA ",message);
          if (alertsSound)   PlaySound("alert2.wav");
   }
}

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

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);
}