//+------------------------------------------------------------------+
//|                                              AbstractChapter.mqh |
//|                                  Copyright 2025, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2025, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict

#include "Inducators.mqh"

class CAbstractChapter {
protected:
   ENUM_TIMEFRAMES timeframe;
   string          symbol;

   CBarsbydate     bar;
   Swing           swing;
   CNewBar         newBar;
   CChartDebug     debug;

protected:
   //========================
   // Life cycle
   //========================
   bool OnNewBar() {
      return newBar.CheckNewBar(symbol, timeframe);
   }

   void UpdateBars(int monthsBack = 3) {
      bar.UpdateFromMonthsBack(symbol, timeframe, monthsBack);
   }

   //========================
   // Bar info
   //========================
   int Bars() {
      return bar.Size();
   }

   bool HasBars(int count) {
      return bar.Size() >= count;
   }

   bool IsValidIndex(int index) {
      return (index >= 0 && index < bar.Size());
   }

   datetime TimeAt(int index) {
      return bar.Time(index);
   }

   double OpenAt(int index) {
      return bar.Open(index);
   }

   double HighAt(int index) {
      return bar.High(index);
   }

   double LowAt(int index) {
      return bar.Low(index);
   }

   double CloseAt(int index) {
      return bar.Close(index);
   }

   double RangeAt(int index) {
      return bar.High(index) - bar.Low(index);
   }

   double BodyTop(int index) {
      return MathMax(bar.Open(index), bar.Close(index));
   }

   double BodyBottom(int index) {
      return MathMin(bar.Open(index), bar.Close(index));
   }

   double BodySize(int index) {
      return MathAbs(bar.Close(index) - bar.Open(index));
   }

   double UpperWick(int index) {
      return bar.High(index) - BodyTop(index);
   }

   double LowerWick(int index) {
      return BodyBottom(index) - bar.Low(index);
   }

   double MidPrice(double a, double b) {
      return (a + b) * 0.5;
   }

   double CandleMid(int index) {
      return MidPrice(bar.High(index), bar.Low(index));
   }

   //========================
   // Price helpers
   //========================
   double PointValue() {
      return bar.Point();
   }

   double PointsToPrice(int points) {
      return points * PointValue();
   }

   bool NearPrice(double a, double b, int tolerancePoints) {
      return MathAbs(a - b) <= PointsToPrice(tolerancePoints);
   }

   //========================
   // Swing helpers
   //========================
   bool IsValidSwingValue(double value) {
      return swing.IsValidValue(value);
   }

   bool IsSwingHigh(int index) {
      if(!IsValidIndex(index)) return false;
      return swing.IsValidValue(swing.HighAt(index));
   }

   bool IsSwingLow(int index) {
      if(!IsValidIndex(index)) return false;
      return swing.IsValidValue(swing.LowAt(index));
   }

   int PrevSwingHighIndex(int anchor, int n = 1) {
      int found = -1;

      for(int i = anchor; i >= 0; i--) {
         if(IsSwingHigh(i)) {
            found++;
            if(found == n)
               return i;
         }
      }

      return -1;
   }

   int PrevSwingLowIndex(int anchor, int n = 1) {
      int found = -1;

      for(int i = anchor; i >= 0; i--) {
         if(IsSwingLow(i)) {
            found++;
            if(found == n)
               return i;
         }
      }

      return -1;
   }

   int NextSwingHighIndex(int anchor, int n = 1) {
      int found = 0;

      for(int i = anchor; i < bar.Size(); i++) {
         if(IsSwingHigh(i)) {
            found++;
            if(found == n)
               return i;
         }
      }

      return -1;
   }

   int NextSwingLowIndex(int anchor, int n = 1) {
      int found = 0;

      for(int i = anchor; i < bar.Size(); i++) {
         if(IsSwingLow(i)) {
            found++;
            if(found == n)
               return i;
         }
      }

      return -1;
   }

   //========================
   // Break helpers
   //========================
   bool BreakAboveHigh(int refIndex, int barIndex) {
      if(!IsValidIndex(refIndex) || !IsValidIndex(barIndex)) return false;
      return bar.Close(barIndex) > bar.High(refIndex);
   }

   bool BreakBelowLow(int refIndex, int barIndex) {
      if(!IsValidIndex(refIndex) || !IsValidIndex(barIndex)) return false;
      return bar.Close(barIndex) < bar.Low(refIndex);
   }

   bool WickAboveHigh(int refIndex, int barIndex) {
      if(!IsValidIndex(refIndex) || !IsValidIndex(barIndex)) return false;
      return bar.High(barIndex) > bar.High(refIndex);
   }

   bool WickBelowLow(int refIndex, int barIndex) {
      if(!IsValidIndex(refIndex) || !IsValidIndex(barIndex)) return false;
      return bar.Low(barIndex) < bar.Low(refIndex);
   }

   //========================
   // Candle state
   //========================
   bool IsBullishCandle(int index) {
      if(!IsValidIndex(index)) return false;
      return bar.Close(index) > bar.Open(index);
   }

   bool IsBearishCandle(int index) {
      if(!IsValidIndex(index)) return false;
      return bar.Close(index) < bar.Open(index);
   }

   bool IsDojiCandle(int index, double maxBodyToRange = 0.10) {
      if(!IsValidIndex(index)) return false;

      double range = RangeAt(index);
      if(range <= 0.0) return false;

      return (BodySize(index) / range) <= maxBodyToRange;
   }

   bool IsSellToBuyCandle(int index, double wickToBodyRatio = 1.2) {
      if(!IsValidIndex(index)) return false;

      double body = BodySize(index);
      if(body <= 0.0) body = _Point;

      return LowerWick(index) >= body * wickToBodyRatio;
   }

   bool IsBuyToSellCandle(int index, double wickToBodyRatio = 1.2) {
      if(!IsValidIndex(index)) return false;

      double body = BodySize(index);
      if(body <= 0.0) body = _Point;

      return UpperWick(index) >= body * wickToBodyRatio;
   }

   //========================
   // Extremes in range
   //========================
   int FindLowestIndex(int fromIndex, int toIndex, bool inclusive = false) {
      if(fromIndex > toIndex) {
         int temp = fromIndex;
         fromIndex = toIndex;
         toIndex = temp;
      }

      int start = (inclusive ? fromIndex : fromIndex + 1);
      int end   = (inclusive ? toIndex   : toIndex - 1);

      if(start > end) return -1;

      int lowestIndex = -1;

      for(int i = start; i <= end; i++) {
         if(!IsValidIndex(i)) continue;

         if(lowestIndex == -1 || bar.Low(i) < bar.Low(lowestIndex))
            lowestIndex = i;
      }

      return lowestIndex;
   }

   int FindHighestIndex(int fromIndex, int toIndex, bool inclusive = false) {
      if(fromIndex > toIndex) {
         int temp = fromIndex;
         fromIndex = toIndex;
         toIndex = temp;
      }

      int start = (inclusive ? fromIndex : fromIndex + 1);
      int end   = (inclusive ? toIndex   : toIndex - 1);

      if(start > end) return -1;

      int highestIndex = -1;

      for(int i = start; i <= end; i++) {
         if(!IsValidIndex(i)) continue;

         if(highestIndex == -1 || bar.High(i) > bar.High(highestIndex))
            highestIndex = i;
      }

      return highestIndex;
   }

   //========================
   // Zone helpers for Chapter 4
   //========================
   double ZoneMid(double top, double bottom) {
      return (top + bottom) * 0.5;
   }

   double ZoneHeight(double top, double bottom) {
      return MathAbs(top - bottom);
   }

   bool PriceTouchesZone(int index, double top, double bottom) {
      if(!IsValidIndex(index)) return false;

      double zTop = MathMax(top, bottom);
      double zBot = MathMin(top, bottom);

      return bar.Low(index) <= zTop && bar.High(index) >= zBot;
   }

   bool PriceClosesInsideZone(int index, double top, double bottom) {
      if(!IsValidIndex(index)) return false;

      double zTop = MathMax(top, bottom);
      double zBot = MathMin(top, bottom);
      double c    = bar.Close(index);

      return c <= zTop && c >= zBot;
   }

   bool PriceClosesBeyondSupply(int index, double top) {
      if(!IsValidIndex(index)) return false;
      return bar.Close(index) > top;
   }

   bool PriceClosesBeyondDemand(int index, double bottom) {
      if(!IsValidIndex(index)) return false;
      return bar.Close(index) < bottom;
   }

   //========================
   // Drawing helpers
   //========================
   void DrawLevel(string key,
                  int fromIndex,
                  int toIndex,
                  double price,
                  string text,
                  color col = clrChartreuse,
                  int style = 1) {
      if(!IsValidIndex(fromIndex) || !IsValidIndex(toIndex))
         return;

      debug.LineWithCenteredText(
         key,
         bar.Time(fromIndex), price,
         bar.Time(toIndex),   price,
         text,
         style,
         col
      );
   }

   void DrawZone(string key,
                 int leftIndex,
                 int rightIndex,
                 double top,
                 double bottom,
                 string text,
                 color col,
                 double insetFrac = 0.06,
                 int fontSize = 6,
                 bool drawOnTop = false) {
      if(!IsValidIndex(leftIndex) || !IsValidIndex(rightIndex))
         return;

      debug.RectWithCenteredText(
         symbol,
         key,
         bar.Time(leftIndex),  top,
         bar.Time(rightIndex), bottom,
         text,
         col,
         insetFrac,
         fontSize,
         drawOnTop
      );
   }

public:
   CAbstractChapter(void) {
      timeframe = PERIOD_CURRENT;
      symbol    = _Symbol;
   }

   virtual ~CAbstractChapter() {}

   virtual int OnInit(string s, ENUM_TIMEFRAMES tf_, int lr = 3, int look = 1) {
      timeframe = tf_;
      symbol    = s;

      debug.Init(0, __FILE__, true);

      if(swing.Init("Fractal", s, tf_, lr, look) == -1) {
         Print("Error creating Swing Indicator: ", GetLastError());
         return INIT_FAILED;
      }

      return INIT_SUCCEEDED;
   }

   virtual void OnCalculate() {}
};
//+------------------------------------------------------------------+