//+------------------------------------------------------------------+
//|                                                    MFI Count.mq4 |
//|                               Copyright © 2015, Gehtsoft USA LLC |
//|                                            http://fxcodebase.com |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2015, Gehtsoft USA LLC"
#property link      "http://fxcodebase.com"

#property indicator_separate_window
#property indicator_buffers 2

#property indicator_color1 DarkGreen
#property indicator_color2 FireBrick //Red
#property indicator_width1  2
#property indicator_width2  2

extern int           Period  =  8;
extern bool        alertsOn  =  false;    // Turn alerts on
extern bool alertsOnCurrent  =  true;     // Alerts on currnt (still opened) bar
extern bool   alertsMessage  =  true;     // Aleert should show pop-up message
extern bool     alertsSound  =  false;    // Alerts should play alert sound
extern bool alertsPushNotif  =  false;    // Alerts should send push notification
extern bool     alertsEmail  =  false;    // Alerts should send email


double Up[], Dn[], trend[];

int init()
{
 IndicatorBuffers(3);
 IndicatorDigits(Digits-3);
 
 SetIndexBuffer(0,Up);
 SetIndexBuffer(1,Dn);
 SetIndexBuffer(2,trend);
 
 SetIndexStyle(0,DRAW_HISTOGRAM);
 SetIndexStyle(1,DRAW_HISTOGRAM);
 SetIndexLabel(0,"TrendUP");
 SetIndexLabel(1,"TrendDN");
 
 IndicatorShortName("MFI Count ["+Period+"]");
 
 return(0);
}

int deinit()
{

 return(0);
}

int start()
{
 if(Bars<=3) return(0);
 int ExtCountedBars=IndicatorCounted();
 if (ExtCountedBars<0) return(-1);
 int limit=Bars-2;
 if(ExtCountedBars>2) limit=Bars-ExtCountedBars-1;
 
 int pos;
 double MA, Pr;
 double Sum;
 pos=limit;
 
 while(pos>=0)
 {
  if (pos==Bars-2)
  {
   Up[pos]=0;
   Dn[pos]=0;
  }
  else
  {
   Sum=Up[pos+1]+Dn[pos+1];
   MA=1* (iMFI(NULL, 0, Period*4,  pos) - iMFI(NULL, 0, Period,  pos));
   Pr=1* (iMFI(NULL, 0, Period/2,  pos) - iMFI(NULL, 0, Period,  pos));
   
   if (Sum>=0)
   {
    if (Pr>MA)
    {
     Up[pos]=Up[pos+1]+1;
     Dn[pos]=0;
    }
    else
    {
     Up[pos]=0;
     Dn[pos]=-1;
    }
   }
   else
   {
    if (Pr<MA)
    {
     Up[pos]=0;
     Dn[pos]=Dn[pos+1]-1;
    }
    else
    {
     Up[pos]=1;
     Dn[pos]=0;
    }
   }
  } 
   trend[pos] = trend[pos+1];
   if (Up[pos]> 0) trend[pos]=  1;
   if (Dn[pos]< 0) trend[pos]= -1;
   
   pos--;
 } 
 
 manageAlerts();
 return(0);
}

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

void manageAlerts()
{
   if (alertsOn)
   {
      int whichBar = 1; if (alertsOnCurrent) whichBar = 0;
      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()+" at "+TimeToStr(TimeLocal(),TIME_SECONDS)+" ma count trend changed to "+doWhat;
          if (alertsMessage)   Alert(message);
          if (alertsEmail)     SendMail(Symbol()+" ma count",message);
          if (alertsPushNotif) SendNotification(message);
          if (alertsSound)     PlaySound("alert2.wav");
   }
}