//+------------------------------------------------------------------+
//|                                                         Bar.mqh  |
//|                                                                  |
//|                      KnitPkg for MetaTrader                        |
//|                                                                  |
//|                          MIT License                             |
//|                    Copyright (c) 2025 Douglas Rechia             |
//|                                                                  |
//|  Generic interface for unified bar data access (OHLCV).          |
//|  Defines contracts for accessing individual bar values and       |
//|  typed series objects.                                           |
//|                                                                  |
//+------------------------------------------------------------------+

#include "TimeSeries.mqh"

//+------------------------------------------------------------------+
//| IBar — interface for bar data providers
//+------------------------------------------------------------------+
interface IBar
  {
public:
// Individual bar accessors (shift = 0 is the most recent bar)
   datetime         Time(int shift = 0);
   double           Open(int shift = 0);
   double           High(int shift = 0);
   double           Low(int shift = 0);
   double           Close(int shift = 0);
   long             Volume(int shift = 0);
   long             TickVolume(int shift = 0);

// Typed series accessors
   ITimeSeries<datetime>*       TimeSeries();
   ITimeSeries<double>*         OpenSeries();
   ITimeSeries<double>*         HighSeries();
   ITimeSeries<double>*         LowSeries();
   ITimeSeries<double>*         CloseSeries();
   ITimeSeries<long>*           VolumeSeries();
   ITimeSeries<long>*           TickVolumeSeries();

// Returns the total number of bars loaded
   int              Size();
  };
//+------------------------------------------------------------------+