//+------------------------------------------------------------------+
//|                                               WRB-Hidden-Gap.mq5 |
//| 				                      Copyright © 2014, EarnForex.com |
//|                                        http://www.earnforex.com/ |
//+------------------------------------------------------------------+
#property copyright "EarnForex.com"
#property link      ""
#property version   "1.01"
//---
#property description ""
#property description ""
#property description ""
#property description "by Andriy Moraru."
//---
#property indicator_chart_window
//---
#property indicator_plots   1
#property indicator_buffers 1
//---
#property indicator_type1 DRAW_ARROW
#property indicator_style1 STYLE_SOLID
#property indicator_color1 clrAqua      // WRB symbol
#property indicator_width1 1
//---
#define UNFILLED_PREFIX "HG_UNFILLED_"
#define FILLED_PREFIX "HG_FILLED_"
#define PREFIX "HG_"
//---
input bool UseWholeBars=false;
input int WRB_LookBackBarCount= 3;
input int WRB_WingDingsSymbol = 115;
input color HGcolor1 = clrDodgerBlue;
input color HGcolor2 = clrBlue;
input ENUM_LINE_STYLE HGstyle=STYLE_SOLID;
input int StartCalculationFromBar=100;
input bool HollowBoxes=false;
input bool DoAlerts=false;
//---- buffers
double WRB[];
//---
int totalBarCount=-1;
//+------------------------------------------------------------------+
//| Delete all objects with given prefix                             |
//+------------------------------------------------------------------+
void ObDeleteObjectsByPrefix(string Prefix)
  {
   int L = StringLen(Prefix);
   int i = 0;
   while(i<ObjectsTotal(0,-1,OBJ_RECTANGLE))
     {
      string ObjName=ObjectName(0,i,-1,OBJ_RECTANGLE);
      if(StringSubstr(ObjName,0,L)!=Prefix)
        {
         i++;
         continue;
        }
      ObjectDelete(0,ObjName);
     }
  }
//+------------------------------------------------------------------+
//|  intersect: Check two bars intersect or not                      |
//+------------------------------------------------------------------+
int intersect(double H1,double L1,double H2,double L2)
  {
   if((L1 > H2) || (H1 < L2)) return (0);
   if((H1 >= H2) && (L1 >= L2)) return(1);
   if((H1 <= H2) && (L1 <= L2)) return(2);
   if((H1 >= H2) && (L1 <= L2)) return(3);
   if((H1 <= H2) && (L1 >= L2)) return(4);
   return(0);
  }
//+------------------------------------------------------------------+
//|  checkHGFilled: Check if the hidden gap is filled or not         |
//+------------------------------------------------------------------+
void checkHGFilled(int barNumber,const double &High[],const double &Low[],const datetime &Time[],int rates_total)
  {
   int j,i;
   string ObjectText;
   string Prefix=UNFILLED_PREFIX;
   double box_H,box_L;
   double HGFillPA_H,HGFillPA_L;
   datetime startTime;
   color objectColor;
//---
   int L=StringLen(Prefix);
   i=0;
   while(i<ObjectsTotal(0,-1,OBJ_RECTANGLE)) // loop over all unfilled boxes
     {
      string ObjName=ObjectName(0,i,-1,OBJ_RECTANGLE);
      if(StringSubstr(ObjName,0,L)!=Prefix)
        {
         i++;
         continue;
        }
      box_H=ObjectGetDouble(0,ObjName,OBJPROP_PRICE,0); // get HG high and low values
      box_L= ObjectGetDouble(0, ObjName, OBJPROP_PRICE, 1);
      objectColor=(color)ObjectGetInteger(0,ObjName,OBJPROP_COLOR);
      startTime=(color)ObjectGetInteger(0,ObjName,OBJPROP_TIME,0);
      //---
      HGFillPA_H = High[barNumber];
      HGFillPA_L = Low[barNumber];
      //---
      j=0;
      while((intersect(High[barNumber-j],Low[barNumber-j],box_H,box_L)!=0) && (barNumber-j>=0) && (startTime<Time[barNumber-j]))
        {
         if(High[barNumber - j] > HGFillPA_H) HGFillPA_H = High[barNumber - j];
         if(Low[barNumber - j]  < HGFillPA_L) HGFillPA_L = Low[barNumber - j];
         if((HGFillPA_H>box_H) && (HGFillPA_L<box_L))
           {
            ObjectDelete(0,ObjName);
            ObjectText=FILLED_PREFIX+TimeToString(startTime,TIME_DATE|TIME_MINUTES);
            ObjectCreate(0,ObjectText,OBJ_RECTANGLE,0,startTime,box_H,Time[barNumber],box_L);
            ObjectSetInteger(0,ObjectText,OBJPROP_STYLE,HGstyle);
            ObjectSetInteger(0,ObjectText,OBJPROP_COLOR,objectColor);
            ObjectSetInteger(0,ObjectText,OBJPROP_FILL,!HollowBoxes);
            break;
           }
         j++;
        }
      i++;
     }
  }
//+------------------------------------------------------------------+
//| checkWRB: Check if the given bar is a WRB or not                 |
//| The lookback period can be changed by user input                 |
//| If UseWholeBars = true, High[] and Low[] will be passed          |
//| to this function.                                                |
//+------------------------------------------------------------------+
bool checkWRB(int i,const double &Open[],const double &Close[])
  {
   int j;
   bool WRB_test;
   double body,bodyPrior;
//---
   WRB_test=true;
   body=MathAbs(Open[i]-Close[i]);
   for(j=1; j<=WRB_LookBackBarCount; j++)
     {
      bodyPrior=MathAbs(Open[i-j]-Close[i-j]);
      if(bodyPrior>body)
        {
         WRB_test=false;
         break;
        }
     }
//---
   if(WRB_test) WRB[i]=(Open[i]+Close[i])/2;
   else WRB[i]=EMPTY_VALUE;
//---
   return(WRB_test);
  }
//+------------------------------------------------------------------+
//| checkHG: Checks HG status of the previous bar.                   |
//+------------------------------------------------------------------+
void checkHG(int i,const double &High[],const double &Low[],const double &Open[],const double &Close[],const datetime &Time[])
  {
   string ObjectText;
   double H,L,H2,L2,H1,L1,A,B;
   int j;
   color HGcolor=HGcolor1;
//--- HG-TEST ( test the previous bar i-1)
   if(WRB[i-1]!=EMPTY_VALUE) // First rule to become a HG is to become a WRB
     {
      H2 = High[i - 2];
      L2 = Low[i - 2];
      H1 = High[i];
      L1 = Low[i];
      //---
      if(UseWholeBars)
        {
         H = High[i - 1];
         L = Low[i - 1];
        }
      else if(Open[i-1]>Close[i-1])
        {
         H = Open[i - 1];
         L = Close[i - 1];
        }
      else
        {
         H = Close[i - 1];
         L = Open[i - 1];
        }
      //--- Older bar higher than the newer.
      if(L2>H1)
        {
         A = MathMin(L2, H);
         B = MathMax(H1, L);
        }
      else if(L1>H2)
        {
         A = MathMin(L1, H);
         B = MathMax(H2, L);
        }
      else return;
      //---
      if(A>B)
        {
         int Length=StringLen(UNFILLED_PREFIX);
         j=0;
         while(j<ObjectsTotal(0,-1,OBJ_RECTANGLE)) // loop over all unfilled boxes
           {
            ObjectText=ObjectName(0,j,-1,OBJ_RECTANGLE);
            if(StringSubstr(ObjectText,0,Length)!=UNFILLED_PREFIX)
              {
               j++;
               continue;
              }
            //--- Switch colors if the new Hidden Gap is intersecting with previous Hidden Gap.
            if(intersect(ObjectGetDouble(0,ObjectText,OBJPROP_PRICE),ObjectGetDouble(0,ObjectText,OBJPROP_PRICE,1),A,B)!=0)
              {
               HGcolor=(color)ObjectGetInteger(0,ObjectText,OBJPROP_COLOR);
               if(HGcolor==HGcolor1) HGcolor=HGcolor2;
               else HGcolor=HGcolor1;
               break;
              }
            j++;
           }

         ObjectText=UNFILLED_PREFIX+TimeToString(Time[i-1],TIME_DATE|TIME_MINUTES);
         ObjectCreate(0,ObjectText,OBJ_RECTANGLE,0,Time[i-1],A,TimeCurrent()+10*365*24*60*60,B);
         ObjectSetInteger(0,ObjectText,OBJPROP_STYLE,HGstyle);
         ObjectSetInteger(0,ObjectText,OBJPROP_COLOR,HGcolor);
         ObjectSetInteger(0,ObjectText,OBJPROP_FILL,!HollowBoxes);
        }
     } //End of HG-Test
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void CheckAlert()
  {
   int total=ObjectsTotal(0,-1,OBJ_RECTANGLE);
//--- Loop over all unfilled boxes.
   for(int j=0; j<total; j++)
     {
      string ObjectText=ObjectName(0,j,-1,OBJ_RECTANGLE);
      //--- Object marked as alerted.
      if(StringSubstr(ObjectText,StringLen(ObjectText)-1,1)=="A")
        {
         //--- Try to find a dupe object (could be result of a bug) and delete it.
         string ObjectNameWithoutA=StringSubstr(ObjectText,0,StringLen(ObjectText)-1);
         if(ObjectFind(0,ObjectNameWithoutA)>=0) ObjectDelete(0,ObjectNameWithoutA);
         continue;
        }
      int Length=StringLen(UNFILLED_PREFIX);
      if(StringSubstr(ObjectText,0,Length)!=UNFILLED_PREFIX) continue;
      //---
      double Ask = SymbolInfoDouble(Symbol(), SYMBOL_ASK);
      double Bid = SymbolInfoDouble(Symbol(), SYMBOL_BID);
      double Price1 = ObjectGetDouble(0, ObjectText, OBJPROP_PRICE);
      double Price2 = ObjectGetDouble(0, ObjectText, OBJPROP_PRICE, 1);
      double High= MathMax(Price1,Price2);
      double Low = MathMin(Price1,Price2);
      //--- Current price above lower border
      if((Ask>Low) && (Bid<High))
        {
         Alert(Symbol()+": "+"WRB rectangle breached.");
         PlaySound("alert.wav");
         ObjectSetString(0,ObjectText,OBJPROP_NAME,ObjectText+"A");
         return;
        }
     }
  }
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
   SetIndexBuffer(0,WRB,INDICATOR_DATA);
   PlotIndexSetInteger(0,PLOT_ARROW,WRB_WingDingsSymbol);
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,EMPTY_VALUE);
   PlotIndexSetString(0,PLOT_LABEL,"WRB");
   IndicatorSetString(INDICATOR_SHORTNAME,"WRB+HG");
   ArrayInitialize(WRB,EMPTY_VALUE);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   ObDeleteObjectsByPrefix(PREFIX);
  }
//+------------------------------------------------------------------+
//| Custom Market Profile main iteration function                    |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &Time[],
                const double &Open[],
                const double &High[],
                const double &Low[],
                const double &Close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
   if(DoAlerts) CheckAlert();
//--- A new bar started.
   if(totalBarCount!=rates_total)
     {
      int start=prev_calculated;
      start--;
      //--- Need at least WRB_LookBackBarCount bars from the end of the chart to work.
      if(start<WRB_LookBackBarCount) start=WRB_LookBackBarCount;
      //--- Maximum number of bars to calculate is StartCalculationFromBar.
      if(start<rates_total-1-StartCalculationFromBar) start=rates_total-1-StartCalculationFromBar;
      //---
      for(int i=start; i<rates_total-1; i++)
        {
         if(UseWholeBars)checkWRB(i,High,Low);
         else checkWRB(i,Open,Close);
         checkHG(i,High,Low,Open,Close,Time);
         checkHGFilled(i,High,Low,Time,rates_total);
        }
      totalBarCount=rates_total;
     }
//--- Additional check to see if current bar made the Hidden Gap filled.
   checkHGFilled(rates_total-1,High,Low,Time,rates_total);
   WRB[rates_total-1]=EMPTY_VALUE;
//---
   return(rates_total);
  }
//+------------------------------------------------------------------+