//+------------------------------------------------------------------+
//|                                          SignalDTDB.mqh         |
//+------------------------------------------------------------------+
#property copyright "AnimateDread"
#property version "1.0"
#property description "Double Tops and Bottoms Signal"
//+------------------------------------------------------------------+
//| Include files                                                    |
//+------------------------------------------------------------------+
#include "..\Expert\ExpertSignalCustom.mqh"
//+------------------------------------------------------------------+
//| CSignalDTDB class.                                               |
//| Purpose: Class for detecting double tops and bottoms.            |
//|          Inherits from CExpertSignalCustom.                      |
//+------------------------------------------------------------------+
class CSignalDTDB : public CExpertSignalCustom
  {
protected:
   // Pattern weights
   int               m_pattern_0;
   // Variables for dynamic filtering
   int               m_lookback_period;   // Lookback period to calculate average range

public:
                     CSignalDTDB();
                    ~CSignalDTDB();
   // Methods for adjusting pattern weights
   void              Pattern_0(int value) { m_pattern_0 = value; }
   void              LookBackPeriod(int value) { m_lookback_period = value; }
   virtual void      ApplyPatternWeight(int patternNumber, int weight);
   // Method to validate parameters
   virtual bool      ValidationSettings();
   // Methods to generate signals
   virtual int       LongCondition(void);
   virtual int       ShortCondition(void);

protected:
   // Method to detect double tops
   bool              DetectDoubleTop(int startIdx);
   // Method to detect double bottoms
   bool              DetectDoubleBottom(int startIdx);
   // Helper method to detect peaks and troughs
   bool              IsExtreme(int idx, double prevExtreme1, double prevExtreme2, bool isPeak)
     {
      double currentValue = isPeak ? High(idx) : Low(idx);
      return isPeak ? (currentValue > prevExtreme1 && currentValue > prevExtreme2)
             : (currentValue < prevExtreme1 && currentValue < prevExtreme2);
     }
   // Common method to detect Double Top or Bottom
   bool              DetectDoubleExtreme(int startIdx, bool isTop, double threshold = 0.02, int symmetryThreshold = 2)
     {
      int extremesFound = 0;
      double extreme1 = 0, extreme2 = 0;
      int extreme1Idx = 0, extreme2Idx = 0;
      double prevExtreme1 = isTop ? -DBL_MAX : DBL_MAX, prevExtreme2 = prevExtreme1;
      int trendAnalysisStartIdx = MathMax(0, startIdx - m_lookback_period);
      for(int i = startIdx; i >= trendAnalysisStartIdx; i--)
        {
         double value = isTop ? High(i) : Low(i);
         if(extremesFound == 0 && IsExtreme(i, prevExtreme1, prevExtreme2, isTop))
           {
            extreme1 = value;
            extreme1Idx = i;
            extremesFound++;
           }
         else
            if(extremesFound == 1 && IsExtreme(i, prevExtreme1, prevExtreme2, isTop))
              {
               extreme2 = value;
               extreme2Idx = i;
               extremesFound++;
               if(fabs(extreme1 - extreme2) / fabs(extreme1) < threshold)
                 {
                  double extremeDistance = fabs(extreme2Idx - extreme1Idx);
                  double oppositeDuration = fabs(extreme1Idx - startIdx);
                  if(fabs(extremeDistance - oppositeDuration) < symmetryThreshold)
                    {
                     double neckline = (extreme1 + extreme2) / 2;
                     if((isTop && Low(startIdx) < neckline) || (!isTop && High(startIdx) > neckline))
                       {
                        return true;
                       }
                    }
                 }
               // Reset extremesFound to 1 to check for another potential double top/bottom
               extremesFound = 1;
               extreme1 = extreme2;
               extreme1Idx = extreme2Idx;
              }
         prevExtreme2 = prevExtreme1;
         prevExtreme1 = value;
        }
      return false;
     }
  };
//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CSignalDTDB::CSignalDTDB() :
   m_pattern_0(30),
   m_lookback_period(10)
  {
   m_id = "DTDB";
   m_pattern_count = 1;
  }
//+------------------------------------------------------------------+
//| Destructor                                                       |
//+------------------------------------------------------------------+
CSignalDTDB::~CSignalDTDB(void)
  {
  }
//+------------------------------------------------------------------+
//| Validation settings                                              |
//+------------------------------------------------------------------+
bool CSignalDTDB::ValidationSettings()
  {
   if(!CExpertSignalCustom::ValidationSettings())
      return false;
   if(m_lookback_period <= 0 || m_lookback_period > 200)
     {
      Print("Lookback Period must be greater than 0 and smaller than 200");
      return false;
     }
   return true;
  }
//+------------------------------------------------------------------+
//| Detect Double Top                                                |
//+------------------------------------------------------------------+
bool CSignalDTDB::DetectDoubleTop(int startIdx)
  {
   return DetectDoubleExtreme(startIdx, true);
  }
//+------------------------------------------------------------------+
//| Detect Double Bottom                                             |
//+------------------------------------------------------------------+
bool CSignalDTDB::DetectDoubleBottom(int startIdx)
  {
   return DetectDoubleExtreme(startIdx, false);
  }
//+------------------------------------------------------------------+
//| Long Condition                                                   |
//+------------------------------------------------------------------+
int CSignalDTDB::LongCondition(void)
  {
   int result = 0;
   int idx = StartIndex();
   if(IS_PATTERN_USAGE(0) && DetectDoubleBottom(idx))
     {
      result = m_pattern_0;
      m_active_pattern = "Pattern_0";
     }
   if(result != 0)
     {
      m_active_direction = "Buy";
     }
   return result;
  }
//+------------------------------------------------------------------+
//| Short Condition                                                  |
//+------------------------------------------------------------------+
int CSignalDTDB::ShortCondition(void)
  {
   int result = 0;
   int idx = StartIndex();
   if(IS_PATTERN_USAGE(0) && DetectDoubleTop(idx))
     {
      result = m_pattern_0;
      m_active_pattern = "Pattern_0";
     }
   if(result != 0)
     {
      m_active_direction = "Sell";
     }
   return result;
  }
//+------------------------------------------------------------------+
//| Apply Pattern Weight                                             |
//+------------------------------------------------------------------+
void CSignalDTDB::ApplyPatternWeight(int patternNumber, int weight)
  {
   switch(patternNumber)
     {
      default:
         break;
      case 0:
         Pattern_0(weight);
         break;
     }
  }
//+------------------------------------------------------------------+