//+------------------------------------------------------------------+
//|                                    onetarmizifx ZigZag Arrow.mq4 |
//|                                    zigzag modified by onetarmizi |
//|                                             onetarmizi@yahoo.com |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "onetarmizi"
#property link      "http://www.carigold.com/"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Lime
#property indicator_width1 4
#property indicator_color2 Red
#property indicator_width2 4
//---- indicator parameters
extern int ExtDepth=24;
extern int ExtDeviation=5;
extern int ExtBackstep=3;

extern bool   alertsOn            = true;
extern bool   alertsOnCurrent     = false;
extern bool   alertsMessage       = true;
extern bool   alertsNotification  = false;
extern bool   alertsSound         = true;
extern bool   alertsEmail         = false;


//---- indicator buffers
double ExtMapBuffer[];
double ExtMapBuffer2[];


string   previousAlert="nothing";
datetime previousTime;
   
   
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   IndicatorBuffers(2);
//---- drawing settings
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexArrow(0, 233);  //lime up
   SetIndexStyle(1,DRAW_ARROW);
   SetIndexArrow(1, 234); //red down
//---- indicator buffers mapping
   SetIndexBuffer(0,ExtMapBuffer);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexEmptyValue(0,EMPTY_VALUE);
   SetIndexEmptyValue(1,EMPTY_VALUE);
   
//---- indicator short name
   IndicatorShortName("ZigZag("+ExtDepth+","+ExtDeviation+","+ExtBackstep+")");
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int start()
  {
   int    shift, back,lasthighpos,lastlowpos;
   double val,res;
   double curlow,curhigh,lasthigh,lastlow;

   for(shift=Bars-ExtDepth; shift>=0; shift--)
     {
      val=Low[Lowest(NULL,0,MODE_LOW,ExtDepth,shift)];
      if(val==lastlow) val=0.0;
      else 
        { 
         lastlow=val; 
         if((Low[shift]-val)>(ExtDeviation*Point)) val=0.0;
         else
           {
            for(back=1; back<=ExtBackstep; back++)
              {
               res=ExtMapBuffer[shift+back];
               if((res!=0)&&(res>val)) ExtMapBuffer[shift+back]=0.0; 
              }
           }
        } 
      ExtMapBuffer[shift]=val;
      //--- high
      val=High[Highest(NULL,0,MODE_HIGH,ExtDepth,shift)];
      if(val==lasthigh) val=0.0;
      else 
        {
         lasthigh=val;
         if((val-High[shift])>(ExtDeviation*Point)) val=0.0;
         else
           {
            for(back=1; back<=ExtBackstep; back++)
              {
               res=ExtMapBuffer2[shift+back];
               if((res!=0)&&(res<val)) ExtMapBuffer2[shift+back]=0.0; 
              } 
           }
        }
      ExtMapBuffer2[shift]=val;
     }

   // final cutting 
   lasthigh=-1; lasthighpos=-1;
   lastlow=-1;  lastlowpos=-1;

   for(shift=Bars-ExtDepth; shift>=0; shift--)
     {
      curlow=ExtMapBuffer[shift];
      curhigh=ExtMapBuffer2[shift];
      if((curlow==0)&&(curhigh==0)) continue;
      //---
      if(curhigh!=0)
        {
         if(lasthigh>0) 
           {
            if(lasthigh<curhigh) ExtMapBuffer2[lasthighpos]=0;
            else ExtMapBuffer2[shift]=0;
           }
         //---
         if(lasthigh<curhigh || lasthigh<0)
           {
            lasthigh=curhigh;
            lasthighpos=shift;
           }
         lastlow=-1;
        }
      //----
      if(curlow!=0)
        {
         if(lastlow>0)
           {
            if(lastlow>curlow) ExtMapBuffer[lastlowpos]=0;
            else ExtMapBuffer[shift]=0;
           }
         //---
         if((curlow<lastlow)||(lastlow<0))
           {
            lastlow=curlow;
            lastlowpos=shift;
           } 
         lasthigh=-1;
        }
     }
  
   for(shift=Bars-1; shift>=0; shift--)
     {
      if(shift>=Bars-ExtDepth) ExtMapBuffer[shift]=0.0;
      else
        {
         res=ExtMapBuffer2[shift];
         if(res!=0.0) ExtMapBuffer2[shift]=res;
        }
     }
     
     manageAlerts();
     
     return(0);
     
  }
  
  //end//
 
void manageAlerts()
{
   string message = "";
   
   if (alertsOn)
   {
      if (alertsOnCurrent)
           int whichBar = 0;
      else     whichBar = 1; 
      
      
      
       
      if (ExtMapBuffer[whichBar]  != EMPTY_VALUE && ExtMapBuffer2[whichBar] == EMPTY_VALUE) 
      {
          message =  StringConcatenate(Symbol()," ",timeFrameToString(_Period)," at ",TimeToStr(TimeLocal(),TIME_SECONDS)," 24 Arrow ","Signal Up Arrow");
         doAlert(whichBar, message);
      }
      
      if (ExtMapBuffer2[whichBar] != EMPTY_VALUE && ExtMapBuffer[whichBar] == EMPTY_VALUE) 
      {
        message =  StringConcatenate(Symbol()," ",timeFrameToString(_Period)," at ",TimeToStr(TimeLocal(),TIME_SECONDS)," 24 Arrow ","Signal Down Arrow ");
        doAlert(whichBar, message);
      }
   }
}

//
//
//
//
//

void doAlert(int forBar, string message)
{
 
   if (previousAlert != message && previousTime != Time[forBar]) 
   {
       previousAlert  = message;
       previousTime   = Time[forBar];

        
          if (alertsMessage)      Alert(message);
          if (alertsEmail)        SendMail(StringConcatenate(Symbol(),"HalfTrend "),message);
          if (alertsNotification) SendNotification(message);
          if (alertsSound)        PlaySound("alert2.wav");
   }
}

string sTfTable[] = {"M1","M5","M10","M15","M30","H1","H4","D1","W1","MN"};
int    iTfTable[] = {1,5,10,15,30,60,240,1440,10080,43200};

string timeFrameToString(int tf)
{
   for (int i=ArraySize(iTfTable)-1; i>=0; i--) 
         if (tf==iTfTable[i]) return(sTfTable[i]);
                              return("");
}