#property indicator_separate_window
#property indicator_buffers 5
#property indicator_color1 Yellow
#property indicator_color2 DeepSkyBlue
#property indicator_color3 Green
#property indicator_color4 Red
#property indicator_color5 Blue

#property indicator_minimum 0
#property indicator_maximum 1
//---- input parameters
extern int PeriodWATR=10;
extern double Kwatr=1.0000;
extern int HighLow=0;
extern int cbars = 0;
extern int from  = 0;
extern int maP  = 50;


//---- indicator buffers
double LineMinBuffer[];
double LineMidBuffer[];
double LineBuyBuffer[];
double LineSellBuffer[];
double LineExitBuffer[];
double Ma50[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
  int init()
  {
   string short_name;
   IndicatorBuffers(6);
//---- indicator line
   SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,1);
   SetIndexStyle(1,DRAW_LINE,STYLE_SOLID,1);
   SetIndexStyle(2,DRAW_ARROW,STYLE_SOLID,1);
   SetIndexStyle(3,DRAW_ARROW,STYLE_SOLID,1);
   SetIndexStyle(4,DRAW_ARROW);
   
   SetIndexStyle(5,DRAW_NONE);
   SetIndexEmptyValue(5,0);
   
   SetIndexEmptyValue(2,0);
   SetIndexArrow(2,233);
   SetIndexEmptyValue(3,0);
   SetIndexArrow(3,234);
   SetIndexEmptyValue(4,0);
   SetIndexArrow(4,174);
  
   
   SetIndexBuffer(0,LineMinBuffer);
   SetIndexBuffer(1,LineMidBuffer);
   SetIndexBuffer(2,LineBuyBuffer);
   SetIndexBuffer(3,LineSellBuffer);
   SetIndexBuffer(4,LineExitBuffer);
   SetIndexBuffer(5,Ma50);

   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
//---- name for DataWindow and indicator subwindow label
   short_name="Nina("+PeriodWATR+","+Kwatr+","+HighLow+")";
   IndicatorShortName(short_name);
//----
   SetIndexDrawBegin(0,PeriodWATR);
   SetIndexDrawBegin(1,PeriodWATR);

//----
   return(0);
  }

int last_update = 0;
int last = 0;

int start(){
   if(last==Bars) return (0);
   last = Bars;

   int limit = cbars;
   
   if(limit==0 || limit>Bars) limit = Bars;
   //last_update = Bars;
      
   int      i,shift,TrendMin,TrendMax,TrendMid;
   double   SminMin0,SmaxMin0,SminMin1,SmaxMin1,SumRange,dK,WATR0,WATRmax,WATRmin,WATRmid;
   double   SminMax0,SmaxMax0,SminMax1,SmaxMax1,SminMid0,SmaxMid0,SminMid1,SmaxMid1;
   double   linemin,linemax,linemid,Stoch1,Stoch2,bsmin,bsmax;
   	
   int StepSizeMin,StepSizeMax,StepSizeMid;
   double min,max,mid,h,l,c;
   	
   int b = 0;	
   int last = 0,ma = 0,last_ma = 0;
   //ArrayInitialize(Ma50,0);
   //ArrayInitialize(LineBuyBuffer,0);
   //ArrayInitialize(LineSellBuffer,0);
   Print(limit);
   
   for(shift=limit-1;shift>=from;shift--){	
	  SumRange=0;
	  for (i=PeriodWATR-1;i>=from;i--){ 
         dK = 1+1.0*(PeriodWATR-i)/PeriodWATR;
         SumRange+= dK*MathAbs(High[i+shift]-Low[i+shift]);
         }
	  WATR0 = SumRange/PeriodWATR;
	
	  WATRmax=MathMax(WATR0,WATRmax);
	  if (shift==limit-1-PeriodWATR) WATRmin=WATR0;
	  WATRmin=MathMin(WATR0,WATRmin);
	
	  StepSizeMin=MathRound(Kwatr*WATRmin/Point);
	  StepSizeMax=MathRound(Kwatr*WATRmax/Point);
	  StepSizeMid=MathRound(Kwatr*0.5*(WATRmax+WATRmin)/Point);
	  
     min = Kwatr*WATRmin;
     max = Kwatr*WATRmax;
     mid = Kwatr*0.5*(WATRmax+WATRmin);
	  
	  //b = iBarShift(Symbol(),tPeriod,Time[shift]);
	  c = Close[shift];//iClose(Symbol(),tPeriod,b);
	  h = High[shift];//iHigh(Symbol(),tPeriod,b)
	  l = Low[shift];//iLow(Symbol(),tPeriod,b)
	  
	  if (HighLow>0){
	    SmaxMin0=l+2*min;
	    SminMin0=h-2*min;
	  
	    SmaxMax0=l+2*max;
	    SminMax0=h-2*max;
	  
	    SmaxMid0=l+2*mid;
	    SminMid0=h-2*mid;
	  
	    if(c>SmaxMin1) TrendMin=1; 
	    if(c<SminMin1) TrendMin=-1;
	  
	    if(c>SmaxMax1) TrendMax=1; 
	    if(c<SminMax1) TrendMax=-1;
	  
	    if(c>SmaxMid1) TrendMid=1; 
	    if(c<SminMid1) TrendMid=-1;
	    }
	 
	  if (HighLow == 0){
	    SmaxMin0=c+2*min;
	    SminMin0=c-2*min;
	  
	    SmaxMax0=c+2*max;
	    SminMax0=c-2*max;
	  
	    SmaxMid0=c+2*mid;
	    SminMid0=c-2*mid;
	  
	    if(c>SmaxMin1) TrendMin=1; 
	    if(c<SminMin1) TrendMin=-1;
	  
	    if(c>SmaxMax1) TrendMax=1; 
	    if(c<SminMax1) TrendMax=-1;
	  
	    if(c>SmaxMid1) TrendMid=1; 
	    if(c<SminMid1) TrendMid=-1;
	    }
	 	
	  if(TrendMin>0 && SminMin0<SminMin1) SminMin0=SminMin1;
	  if(TrendMin<0 && SmaxMin0>SmaxMin1) SmaxMin0=SmaxMin1;
		
	  if(TrendMax>0 && SminMax0<SminMax1) SminMax0=SminMax1;
	  if(TrendMax<0 && SmaxMax0>SmaxMax1) SmaxMax0=SmaxMax1;
	  
	  if(TrendMid>0 && SminMid0<SminMid1) SminMid0=SminMid1;
	  if(TrendMid<0 && SmaxMid0>SmaxMid1) SmaxMid0=SmaxMid1;
	  
	  
	  if (TrendMin>0) linemin=SminMin0+min;
	  if (TrendMin<0) linemin=SmaxMin0-min;
	  
	  if (TrendMax>0) linemax=SminMax0+max;
	  if (TrendMax<0) linemax=SmaxMax0-max;
	  
	  if (TrendMid>0) linemid=SminMid0+mid;
	  if (TrendMid<0) linemid=SmaxMid0-mid;
	  
	  bsmin=linemax-max;
	  bsmax=linemax+max;
	  Stoch1=(linemin-bsmin)/(bsmax-bsmin);
	  Stoch2=(linemid-bsmin)/(bsmax-bsmin);
	  
	  LineMinBuffer[shift]=Stoch1;
	  LineMidBuffer[shift]=Stoch2;
	  
	  
	  SminMin1=SminMin0;
	  SmaxMin1=SmaxMin0;
	  
	  SminMax1=SminMax0;
	  SmaxMax1=SmaxMax0;
	  
	  SminMid1=SminMid0;
	  SmaxMid1=SmaxMid0;

     Ma50[shift] = iMA(NULL,0,50,0,MODE_EMA,PRICE_CLOSE,shift);
     if(is_inside(shift)) last_ma = shift;
     
	  if(
	     is_cross(shift)
	     ){
	     last = 0;
	     LineExitBuffer[shift] = LineMidBuffer[shift];   
	     // BUY or SELL
        if(LineMinBuffer[shift]-LineMidBuffer[shift]>0){
            if(/*last_ma == shift || */(last_ma!=0 && Ma50[last_ma]-Open[shift]<0)){
               // VERY GOOD SIGNAL - BEST TRADE
               LineBuyBuffer[shift] = LineMidBuffer[shift];
	            if(last_ma == shift && MathAbs(Ma50[last_ma]-Open[shift])/Point < 20) LineExitBuffer[shift] = LineMidBuffer[shift];
               }
            else if(last_ma!=0){
               last = shift;
               }
            }
        else if(LineMinBuffer[shift]-LineMidBuffer[shift]<0){
            if(/*last_ma == shift || */(last_ma!=0 && Ma50[last_ma]-Open[shift]>0)){
               // VERY GOOD SIGNAL - BEST TRADE
               LineSellBuffer[shift] = LineMinBuffer[shift];
	            if(last_ma == shift && MathAbs(Ma50[last_ma]-Open[shift])/Point < 20) LineExitBuffer[shift] = LineMinBuffer[shift];
               }
            else if(last_ma!=0){
               last = -shift;
               }
            } 
	     }
	   else{
	     if(last>0 && Open[shift]-Ma50[shift]>0/* && last_ma==shift+1*/){
	        LineBuyBuffer[shift] = LineMidBuffer[shift];
	        last = 0;
	        }
	     else if(last<0 && Open[shift]-Ma50[shift]<0/* && last_ma==shift+1*/){
	        LineSellBuffer[shift] = LineMinBuffer[shift];
	        last = 0;
	        }
	     }
	   }
	return(0);	
 }

bool is_inside(int shift){
   return (
      (Close[shift] - Ma50[shift])*(Open[shift] - Ma50[shift])<0
      //Ma50[shift]>MathMin(Close[shift],Open[shift]) && Ma50[shift]<MathMax(Close[shift],Open[shift])
      );
}

bool is_cross(int shift){
   return 
      (
      (LineMinBuffer[shift]-LineMidBuffer[shift])*(LineMinBuffer[shift+1]-LineMidBuffer[shift+1])<0 
      //|| (LineMinBuffer[shift+1]-LineMidBuffer[shift+1]==0 && LineMinBuffer[shift]-LineMidBuffer[shift]!=0)
      
      //(LineMinBuffer[shift+1]<=0.0 && LineMinBuffer[shift]==0.0 && LineMidBuffer[shift+1]==0.0 && LineMidBuffer[shift]>=0.0) ||
      //(LineMinBuffer[shift+1]==0.0 && LineMinBuffer[shift]<=0.0 && LineMidBuffer[shift+1]>=0.0 && LineMidBuffer[shift]==0.0) 
      );
}