//+------------------------------------------------------------------+
//|                                                   Alert_OsMA.mq4 |
//|                                                 Copyright © 2011 |
//|                                                                  |
//| Awesome oscillator (AO) to be the first bar which changes the
//|  direction from short to long ((Acc0 > 0) && (Acc0 > Acc1))
//|  for long (not necessary to cross 0 line);
//| 
//| OsMA to change the direction (not necessary to cross 0 line)
//|  so I added just (OsMA0 > OsMA1);
//| Accelerator (Acc) to be in the same direction AND with
//|  the “0” line already crossed,
//|  so I added ((Acc0 > 0) && (Acc0 > Acc1)).
//| I attach a picture, the red lines should be short signals
//|  Friday in GBP/JPY, the blue lines long signals; 
 
//|  Trying to simplify it, I reduced the formula
//|  just to (AO0>AO1) or (OsMA0 > OsMA1) or (ACC0 > 0)
//+------------------------------------------------------------------+
#property  copyright "Copyright © 2011"

//---- indicator settings
#property indicator_chart_window
// Set indicator_buffers to number of output buffers
#property  indicator_buffers 2
#property indicator_color1 MediumBlue
#property indicator_color2 Crimson
#property indicator_width1 2
#property indicator_width2 2


//---- indicator buffers
extern bool AlertOn = true;
extern bool UseAcc_6_13 = true;



double     OsMA[];
double     Acc[];
double     AO[];
double     AccHelper[];
double     Up[];
double     Down[];

int CurrentTrend = 0;
int PriorTrend = 0;
int starttime = 0;


bool NewBar() {

    static datetime LastTime = 0;

    if (Time[0] != LastTime) {
        LastTime = Time[0];        
        return (true);
    } else
        return (false);
}





//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
       IndicatorBuffers(6); // add 3 for working buffers
       SetIndexStyle(0, DRAW_ARROW, EMPTY);
       SetIndexArrow(0, 233);
       SetIndexBuffer(0, Up);
       SetIndexStyle(1, DRAW_ARROW, EMPTY);
       SetIndexArrow(1, 234);
       SetIndexBuffer(1, Down);
       
// Following are working buffers       
       SetIndexBuffer(2,Acc);
       SetIndexBuffer(3,OsMA);
       SetIndexBuffer(4,AO);
       SetIndexBuffer(5,AccHelper);
       starttime = TimeLocal();
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("Momentum Alert");
   return(0);
}
   
int deinit()
{
   return(0);
}


//+------------------------------------------------------------------+
//| Oscillators                                                      |
//+------------------------------------------------------------------+
int start()
  {
   int limit, i, counter;
   int    counted_bars=IndicatorCounted();
   double Range, AvgRange;
   double OsMA0,OsMA1;
   double Acc0, Acc1;
   double AO0, AO1, AO2;
   
   //---- macds counted in the 1-st additional buffer
   
   //---- check for possible errors
   if(counted_bars<0) return(-3);

   //---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   
   limit = Bars - counted_bars; /// control the loops
   if (limit < 5) limit = 5; // Make sure it continues to paint

// Get values in working buffers
   for(i = 0; i <= limit; i++) {
            
// Standard OsMA uses close for price 
//      OsMA[i]=iOsMA(NULL,0,12,26,9,PRICE_WEIGHTED,i);
      OsMA[i]=iOsMA(NULL,0,12,26,9,PRICE_CLOSE,i);
      AO[i]=iMA(NULL,0,5,0,MODE_SMA,PRICE_MEDIAN,i)-iMA(NULL,0,34,0,MODE_SMA,PRICE_MEDIAN,i);
      
// Acc actually uses AO for the first values
// You first need this for your version of Acc 
      AccHelper[i]=iMA(NULL,0,6,0,MODE_SMA,PRICE_MEDIAN,i)-iMA(NULL,0,13,0,MODE_SMA,PRICE_MEDIAN,i);
      
   }

// This gets values for Acc 
   for(i = 0; i <= limit; i++) {
      if (UseAcc_6_13)
         Acc[i]=iMAOnArray(AccHelper,Bars,5,0, MODE_SMA,i); // Your version
       else
         Acc[i]=iMAOnArray(AO,Bars,5,0, MODE_SMA,i); // MT4 version
          
   }

// Now put arrows on chart 
   for(i = 0; i <= limit; i++) {
// Determine placement of arrows
      counter=i;
            
      Range=0;
      AvgRange=0;
      for (counter=i ;counter<=i+9;counter++)
      {
         AvgRange=AvgRange+MathAbs(High[counter]-Low[counter]);
      }
      Range=AvgRange/10;

        
//---- dispatch values between 2 buffers

      Acc0=Acc[i];
      Acc1=Acc[i+1];
      OsMA0=OsMA[i];
      OsMA1=OsMA[i+1];
      AO0=Acc[i];
      AO1=Acc[i+1];
      AO2=Acc[i+2];
      
//      if ((Acc0 > 0) && (Acc0 > Acc1) && (OsMA0 > OsMA1) && (AO0>AO1) && (AO1<AO2)) 
      if ( (Acc0 > Acc1) && (OsMA0 > OsMA1) && (AO0>AO1) && (AO1<AO2)) 
            { 
// Only place arrows at change of trend
        PriorTrend = CurrentTrend;
        CurrentTrend = 1;
        if (PriorTrend != CurrentTrend)
        {
           Up[i] = Low[i] - Range * 2;
// Only alert on current candle
           if (AlertOn && i == 0)
              Alert("OsMA Up!  " + Symbol() + " " + Period() + "min " + "at Bid=",Bid);
        }
      }
      
//      if ((Acc0 < 0) && (Acc0 < Acc1) && (OsMA0 < OsMA1) && (AO0 < AO1) && (AO1>AO2))
      if ((Acc0 < Acc1) && (OsMA0 < OsMA1) && (AO0 < AO1) && (AO1>AO2))
      {
// Only place arrows at change of trend
        PriorTrend = CurrentTrend;
        CurrentTrend = -1;
        if (PriorTrend != CurrentTrend)
        {
           Down[i] = High[i] + Range * 2;
// Only alert on current candle
           if (AlertOn && i == 0)
              Alert("OsMA Down!  " + Symbol() + " " + Period() + "min " + "at Bid=",Bid);
        }
     
          
     }
   }
   
//---- done
   return(0);
}