//+------------------------------------------------------------------+
//|                                                    VWAP_Pro.mq5  |
//|                                          Copyright 2025, xxxxxxxx|
//+------------------------------------------------------------------+
#property copyright "Copyright 2025, xxxxxxxx"
#property version   "1.40" // Optimized for incremental calculation
#property description "Volume Weighted Average Price (VWAP) with selectable reset period, timezone shift,"
#property description "custom session times, and candle source (Standard or Heikin Ashi)."

#property indicator_chart_window
#property indicator_buffers 2 // Two buffers for gapped drawing
#property indicator_plots   2

//--- Include the calculator engine ---
#include <MyIncludes\VWAP_Calculator.mqh>

//--- Plot 1: VWAP Line (Odd Periods)
#property indicator_label1  "VWAP"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrOrange
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1

//--- Plot 2: VWAP Line (Even Periods)
#property indicator_label2  ""
#property indicator_type2   DRAW_LINE
#property indicator_color2  clrOrange
#property indicator_style2  STYLE_SOLID
#property indicator_width2  1

//--- Enum for selecting the candle source for calculation ---
enum ENUM_CANDLE_SOURCE
  {
   CANDLE_STANDARD,      // Use standard OHLC data
   CANDLE_HEIKIN_ASHI    // Use Heikin Ashi smoothed data
  };

//--- Input Parameters ---
input group "Period Settings"
input ENUM_VWAP_PERIOD    InpResetPeriod  = PERIOD_SESSION; // Reset Period
input int                 InpSessionTimezoneShift = 0;      // [For Daily Session] Timezone shift in hours vs Broker Time
input group "Custom Session (if selected above)"
input string              InpCustomSessionStart = "09:30";  // Start time (HH:MM) for Custom Session
input string              InpCustomSessionEnd   = "16:00";  // End time (HH:MM) for Custom Session

input group "Calculation Settings"
input ENUM_APPLIED_VOLUME InpVolumeType   = VOLUME_TICK;    // Volume Type
input ENUM_CANDLE_SOURCE  InpCandleSource = CANDLE_STANDARD;  // Candle Source

//--- Indicator Buffers ---
double    BufferVWAP_Odd[];
double    BufferVWAP_Even[];

//--- Global calculator object (as a base class pointer) ---
CVWAPCalculator *g_calculator;

//+------------------------------------------------------------------+
//| Custom indicator initialization function.                        |
//+------------------------------------------------------------------+
int OnInit()
  {
   SetIndexBuffer(0, BufferVWAP_Odd,  INDICATOR_DATA);
   SetIndexBuffer(1, BufferVWAP_Even, INDICATOR_DATA);
   ArraySetAsSeries(BufferVWAP_Odd,  false);
   ArraySetAsSeries(BufferVWAP_Even, false);

   PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, EMPTY_VALUE);
   PlotIndexSetDouble(1, PLOT_EMPTY_VALUE, EMPTY_VALUE);

   bool init_success = false;

   if(InpCandleSource == CANDLE_HEIKIN_ASHI)
     {
      g_calculator = new CVWAPCalculator_HA();
      IndicatorSetString(INDICATOR_SHORTNAME, "VWAP HA");
      PlotIndexSetString(0, PLOT_LABEL, "VWAP HA");
      PlotIndexSetString(1, PLOT_LABEL, "VWAP HA (Segment)");
     }
   else
     {
      g_calculator = new CVWAPCalculator();
      IndicatorSetString(INDICATOR_SHORTNAME, "VWAP");
      PlotIndexSetString(0, PLOT_LABEL, "VWAP");
      PlotIndexSetString(1, PLOT_LABEL, "VWAP (Segment)");
     }

   if(CheckPointer(g_calculator) == POINTER_INVALID)
     {
      Print("Failed to create VWAP Calculator object.");
      return(INIT_FAILED);
     }

// --- Conditional Initialization ---
   if(InpResetPeriod == PERIOD_CUSTOM_SESSION)
     {
      init_success = g_calculator.Init(InpCustomSessionStart, InpCustomSessionEnd, InpVolumeType);
     }
   else
     {
      init_success = g_calculator.Init(InpResetPeriod, InpVolumeType, InpSessionTimezoneShift);
     }

   if(!init_success)
     {
      Print("Failed to initialize VWAP Calculator logic.");
      return(INIT_FAILED);
     }

   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, 1);
   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, 1);
   IndicatorSetInteger(INDICATOR_DIGITS, _Digits);

   return(INIT_SUCCEEDED);
  }

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function.                      |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   if(CheckPointer(g_calculator) != POINTER_INVALID)
      delete g_calculator;
  }

//+------------------------------------------------------------------+
//| Custom indicator calculation function                            |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated, // <--- Now used!
                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(CheckPointer(g_calculator) == POINTER_INVALID)
      return 0;

//--- Delegate calculation with prev_calculated optimization
   g_calculator.Calculate(rates_total, prev_calculated, time, open, high, low, close, tick_volume, volume, BufferVWAP_Odd, BufferVWAP_Even);

   return(rates_total);
  }
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+