#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 = 1000;
extern int from  = 0;


//---- 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_ind_inv(int shift,int dir){
   if(dir!=0){
      for(int i = shift;i<cbars;i++){
         if(dir>0){
	         if(iCustom(NULL,0,"0_IndInverse",2,cbars,1,i)!=0) return (i);
            }
         else if(dir<0){
	         if(iCustom(NULL,0,"0_IndInverse",2,cbars,2,i)!=0) return (-i);
            }
         }
      }
   return (0);
}

int start(){
   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;
   ArrayInitialize(Ma50,0);
   ArrayInitialize(LineBuyBuffer,0);
   ArrayInitialize(LineSellBuffer,0);
   
 
   for(shift=cbars-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==cbars-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;
	  
	  if((LineMinBuffer[shift]-LineMidBuffer[shift])*(LineMinBuffer[shift+1]-LineMidBuffer[shift+1])<0){
	     LineExitBuffer[shift] = LineMidBuffer[shift];
	     // BUY or SELL
        if(LineMinBuffer[shift]>LineMidBuffer[shift]){
         last = shift;
         //LineBuyBuffer[shift] = LineMidBuffer[shift];
         }
        else if(LineMinBuffer[shift]<LineMidBuffer[shift]){
         last = -shift;
         //LineSellBuffer[shift] = LineMidBuffer[shift];
         } 
	     }
	  if(last!=0 && Ma50[shift+1]!=0/* && MathAbs(Ma50[shift+1]-Open[shift])/Point >= 5*/){
	     if(
	        last>0 && ma>0 && last_ind_inv(shift,1)>0
	        ) 
	           LineBuyBuffer[shift] = LineMidBuffer[shift];
	     else if(
	        last<0 && ma<0 && last_ind_inv(shift,-1)<0
	        ) 
	           LineSellBuffer[shift] = LineMidBuffer[shift];
	     }
	   Ma50[shift] = iMA(NULL,0,50,0,MODE_EMA,PRICE_MEDIAN,shift);
	   if(Ma50[shift]>=MathMax(Close[shift],Open[shift])-2.5*Point || Ma50[shift]<=MathMin(Close[shift],Open[shift])+2.5*Point) Ma50[shift] = 0;
	   else{
	     if(Close[shift]>Open[shift]){
	        ma = shift;
	        }
	     else if(Close[shift]<Open[shift]){
	        ma = -shift;
	        }
	     }
	   }
	return(0);	
 }