//+------------------------------------------------------------------+
//|                                          Jurik smooth ribbon.mq4 |
//|                                               mladenfx@gmail.com |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "mladen"
#property link      "mladenfx@gmail.com"

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1 LimeGreen
#property indicator_color2 DarkOrange
#property indicator_color3 DimGray
#property indicator_color4 DimGray
#property indicator_width1 3
#property indicator_width2 3
#property indicator_width3 2
#property indicator_width4 2

//
//
//
//
//

extern string TimeFrame     = "current time frame";
extern double Smooth1Period = 12;
extern int    Smooth1Price  = PRICE_CLOSE;
extern double Smooth1Phase  = 0;
extern double Smooth2Period = 26;
extern int    Smooth2Price  = PRICE_CLOSE;
extern double Smooth2Phase  = 0;
extern bool   Interpolate   = true;

//
//
//
//
//

extern bool   alertsOn        = true;
extern bool   alertsOnCurrent = true;
extern bool   alertsMessage   = true;
extern bool   alertsSound     = false;
extern bool   alertsEmail     = false;

//
//
//
//
//

double buffer1[];
double buffer2[];
double buffer3[];
double buffer4[];
double trend[];

//
//
//
//
//

string indicatorFileName;
int    timeFrame;
bool   calculateValue;
bool   returnBars;

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
//
//
//
//
//

int init()
{
   IndicatorBuffers(5);
   SetIndexBuffer(0,buffer3); SetIndexStyle(0,DRAW_HISTOGRAM);
   SetIndexBuffer(1,buffer4); SetIndexStyle(1,DRAW_HISTOGRAM);
   SetIndexBuffer(2,buffer1);
   SetIndexBuffer(3,buffer2);
   SetIndexBuffer(4,trend);
      if (Smooth1Period>Smooth2Period)
      {
         int temp = Smooth1Period;
                    Smooth1Period = Smooth2Period;
                    Smooth2Period = temp;
      }                    

      //
      //
      //
      //
      //
         
      indicatorFileName = WindowExpertName();
      returnBars        = (TimeFrame=="returnBars");      if (returnBars)     return(0);
      calculateValue    = (TimeFrame=="calculateValue");  if (calculateValue) return(0);
      timeFrame         = stringToTimeFrame(TimeFrame);
   return(0);
}
int deinit()
{
   return(0);
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
//
//
//
//
//

int start()
{
   int counted_bars=IndicatorCounted();
   int limit,i;
   
   if(counted_bars<0) return(-1);
   if(counted_bars>0) counted_bars--;
           limit=MathMin(Bars-counted_bars,Bars-1);
           if (returnBars)  { buffer1[0] = limit+1; return(0); }

   //
   //
   //
   //
   //

   if (calculateValue || timeFrame==Period())
   {
      for(i=limit; i>=0; i--)
      {
         buffer1[i] = iSmooth(iMA(NULL,0,1,0,MODE_SMA,Smooth1Price,i),Smooth1Period,Smooth1Phase,i, 0);
         buffer2[i] = iSmooth(iMA(NULL,0,1,0,MODE_SMA,Smooth2Price,i),Smooth2Period,Smooth2Phase,i,10);
         buffer3[i] = buffer1[i];
         buffer4[i] = buffer2[i];
         trend[i]   = trend[i+1];
      
            if (buffer1[i]>buffer2[i]) trend[i] =  1;
            if (buffer1[i]<buffer2[i]) trend[i] = -1;
      }
      if (!calculateValue) manageAlerts();
      return(0);
   }      

   //
   //
   //
   //
   //
   
   limit = MathMax(limit,MathMin(Bars-1,iCustom(NULL,timeFrame,indicatorFileName,"returnBars",0,0)*timeFrame/Period()));
   for(i=limit; i>=0; i--)
   {
      int y = iBarShift(NULL,timeFrame,Time[i]);
         buffer1[i] = iCustom(NULL,timeFrame,indicatorFileName,"calculateValue",Smooth1Period,Smooth1Price,Smooth1Phase,Smooth2Period,Smooth2Price,Smooth2Phase,0,y);
         buffer2[i] = iCustom(NULL,timeFrame,indicatorFileName,"calculateValue",Smooth1Period,Smooth1Price,Smooth1Phase,Smooth2Period,Smooth2Price,Smooth2Phase,1,y);
         buffer3[i] = buffer1[i];
         buffer4[i] = buffer2[i];
         trend[i]   = trend[i+1];
            if (buffer1[i]>buffer2[i]) trend[i] =  1;
            if (buffer1[i]<buffer2[i]) trend[i] = -1;

         //
         //
         //
         //
         //
      
         if (timeFrame <= Period() || y==iBarShift(NULL,timeFrame,Time[i-1])) continue;
         if (!Interpolate) continue;

         //
         //
         //
         //
         //

         datetime time = iTime(NULL,timeFrame,y);
            for(int n = 1; i+n < Bars && Time[i+n] >= time; n++) continue;	
            double factor = 1.0 / n;
            for(int k = 1; k < n; k++)
            {
               buffer1[i+k] = k*factor*buffer1[i+n] + (1.0-k*factor)*buffer1[i];
               buffer2[i+k] = k*factor*buffer2[i+n] + (1.0-k*factor)*buffer2[i];
               buffer3[i+k] = buffer1[i+k];
               buffer4[i+k] = buffer2[i+k];
            }
   }
   manageAlerts();

   //
   //
   //
   //
   //
      
   return(0);
}

//+-------------------------------------------------------------------
//|                                                                  
//+-------------------------------------------------------------------
//
//
//
//
//

void manageAlerts()
{
   if (alertsOn)
   {
      if (alertsOnCurrent)
           int whichBar = 0;
      else     whichBar = 1; whichBar = iBarShift(NULL,0,iTime(NULL,timeFrame,whichBar));
      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 =  StringConcatenate(Symbol()," ",timeFrameToString(timeFrame)," at ",TimeToStr(TimeLocal(),TIME_SECONDS)," Jurik smooth "+DoubleToStr(Smooth1Period,1)+" crossed Jurik smooth "+DoubleToStr(Smooth2Period,1)+" ",doWhat);
          if (alertsMessage) Alert(message);
          if (alertsEmail)   SendMail(StringConcatenate(Symbol(),"Jurik smooth ribbon "),message);
          if (alertsSound)   PlaySound("alert2.wav");
   }
}

//+------------------------------------------------------------------
//|                                                                 
//+------------------------------------------------------------------
//
//
//
//
//

double wrk[][20];

#define bsmax  5
#define bsmin  6
#define volty  7
#define vsum   8
#define avolty 9

//
//
//
//
//

double iSmooth(double price, double length, double phase, int i, int s)
{
   if (ArrayRange(wrk,0) != Bars) ArrayResize(wrk,Bars);
   if (length <=1) return(price);
   
   int r = Bars-i-1; 
      if (r==0) { for(int k=0; k<7; k++) wrk[0][k+s]=price; for(; k<10; k++) wrk[0][k+s]=0; return(price); }

   //
   //
   //
   //
   //
   
      double len1   = MathMax(MathLog(MathSqrt(0.5*(length-1)))/MathLog(2.0)+2.0,0);
      double pow1   = MathMax(len1-2.0,0.5);
      double del1   = price - wrk[r-1][bsmax+s];
      double del2   = price - wrk[r-1][bsmin+s];
      double div    = 1.0/(10.0+10.0*(MathMin(MathMax(length-10,0),100))/100);
      int    forBar = MathMin(r,10);
	
         wrk[r][volty+s] = 0;
               if(MathAbs(del1) > MathAbs(del2)) wrk[r][volty+s] = MathAbs(del1); 
               if(MathAbs(del1) < MathAbs(del2)) wrk[r][volty+s] = MathAbs(del2); 
         wrk[r][vsum+s] =	wrk[r-1][vsum+s] + (wrk[r][volty+s]-wrk[r-forBar][volty+s])*div;
         
         //
         //
         //
         //
         //
   
         wrk[r][avolty+s] = wrk[r-1][avolty+s]+(2.0/(MathMax(4.0*length,30)+1.0))*(wrk[r][vsum+s]-wrk[r-1][avolty+s]);
            if (wrk[r][avolty+s] > 0)
               double dVolty = wrk[r][volty+s]/wrk[r][avolty+s]; else dVolty = 0;   
	               if (dVolty > MathPow(len1,1.0/pow1)) dVolty = MathPow(len1,1.0/pow1);
                  if (dVolty < 1)                      dVolty = 1.0;

      //
      //
      //
      //
      //
	        
   	double pow2 = MathPow(dVolty, pow1);
      double len2 = MathSqrt(0.5*(length-1))*len1;
      double Kv   = MathPow(len2/(len2+1), MathSqrt(pow2));

         if (del1 > 0) wrk[r][bsmax+s] = price; else wrk[r][bsmax+s] = price - Kv*del1;
         if (del2 < 0) wrk[r][bsmin+s] = price; else wrk[r][bsmin+s] = price - Kv*del2;
	
   //
   //
   //
   //
   //
      
      double R     = MathMax(MathMin(phase,100),-100)/100.0 + 1.5;
      double beta  = 0.45*(length-1)/(0.45*(length-1)+2);
      double alpha = MathPow(beta,pow2);

         wrk[r][0+s] = price + alpha*(wrk[r-1][0+s]-price);
         wrk[r][1+s] = (price - wrk[r][0+s])*(1-beta) + beta*wrk[r-1][1+s];
         wrk[r][2+s] = (wrk[r][0+s] + R*wrk[r][1+s]);
         wrk[r][3+s] = (wrk[r][2+s] - wrk[r-1][4+s])*MathPow((1-alpha),2) + MathPow(alpha,2)*wrk[r-1][3+s];
         wrk[r][4+s] = (wrk[r-1][4+s] + wrk[r][3+s]); 

   //
   //
   //
   //
   //

   return(wrk[r][4+s]);
}

//+-------------------------------------------------------------------
//|                                                                  
//+-------------------------------------------------------------------
//
//
//
//
//

string sTfTable[] = {"M1","M5","M15","M30","H1","H4","D1","W1","MN"};
int    iTfTable[] = {1,5,15,30,60,240,1440,10080,43200};

//
//
//
//
//

int stringToTimeFrame(string tfs)
{
   tfs = StringUpperCase(tfs);
   for (int i=ArraySize(iTfTable)-1; i>=0; i--)
         if (tfs==sTfTable[i] || tfs==""+iTfTable[i]) return(MathMax(iTfTable[i],Period()));
                                                      return(Period());
}
string timeFrameToString(int tf)
{
   for (int i=ArraySize(iTfTable)-1; i>=0; i--) 
         if (tf==iTfTable[i]) return(sTfTable[i]);
                              return("");
}

//
//
//
//
//

string StringUpperCase(string str)
{
   string   s = str;

   for (int length=StringLen(str)-1; length>=0; length--)
   {
      int char = StringGetChar(s, length);
         if((char > 96 && char < 123) || (char > 223 && char < 256))
                     s = StringSetChar(s, length, char - 32);
         else if(char > -33 && char < 0)
                     s = StringSetChar(s, length, char + 224);
   }
   return(s);
}