MyProEA/Include/RiskManager.mqh

//+------------------------------------------------------------------+
//| RiskManager.mqh - Risk and position sizing management             |
//| Calculates lot sizes, validates parameters, checks trading hours  |
//+------------------------------------------------------------------+

#ifndef __RISKMANAGER_MQH__
#define __RISKMANAGER_MQH__

#include "Config.mqh"
#include "Logger.mqh"
#include "MarketData.mqh"
#include "Utilities.mqh"

class CRiskManager
{
private:
   CMarketData *mp_market_data;
   CLogger *mp_logger;

public:
   // Constructor
   CRiskManager(CMarketData *market_data, CLogger *logger)
   {
      mp_market_data = market_data;
      mp_logger = logger;
   }

   // Calculate lot size based on configuration
   double CalculateLotSize(int stop_loss_points)
   {
      double lot = 0.0;

      if(g_lot_mode == LOT_MODE_FIXED)
      {
         lot = g_fixed_lot;
      }
      else if(g_lot_mode == LOT_MODE_RISK)
      {
         lot = CalculateLotByRisk(stop_loss_points);
      }

      return ValidateLotSize(lot);
   }

   // Calculate lot size based on risk percent
   double CalculateLotByRisk(int stop_loss_points)
   {
      double account_balance = AccountInfoDouble(ACCOUNT_BALANCE);
      double stop_loss_distance = CUtilities::PointsToPrice(mp_market_data.GetSymbol(), stop_loss_points);
      double contract_size = CUtilities::GetContractSize(mp_market_data.GetSymbol());
      
      if(stop_loss_distance == 0 || contract_size == 0)
         return g_min_lot;

      // Risk = Account Balance * Risk Percent / 100
      double risk_amount = account_balance * (g_risk_percent / 100.0);
      
      // Lot = Risk Amount / (SL Distance * Contract Size * Point)
      double point = mp_market_data.GetPoint();
      double lot = risk_amount / (stop_loss_distance * contract_size);
      
      return lot;
   }

   // Validate and normalize lot size
   double ValidateLotSize(double lot)
   {
      // Apply global limits first
      if(lot < g_min_lot)
         lot = g_min_lot;
      if(lot > g_max_lot)
         lot = g_max_lot;

      // Normalize to broker's lot step
      lot = CUtilities::NormalizeLot(mp_market_data.GetSymbol(), lot);

      if(mp_logger && g_debug_mode)
         mp_logger.Info(StringFormat("Lot size calculated: %.2f", lot));

      return lot;
   }

   // Check if spread is acceptable
   bool IsSpreadAcceptable()
   {
      int max_spread = g_max_spread_points;
      string symbol = mp_market_data.GetSymbol();

      // XAUUSD/gold normally trades with a much wider spread than forex
      if(StringFind(symbol, "XAU") >= 0 || StringFind(symbol, "GOLD") >= 0)
      {
         max_spread = MathMax(max_spread, 200);
      }

      return mp_market_data.IsSpreadAcceptable(max_spread);
   }

   // Check if trading is allowed by time filter
   bool IsTradingHourValid()
   {
      if(!g_use_trading_hours)
         return true;

      MqlDateTime time_struct;
      TimeToStruct(TimeCurrent(), time_struct);
      int current_hour = time_struct.hour;

      if(g_trade_start_hour <= g_trade_end_hour)
      {
         // Normal case: e.g., 8:00 to 20:00
         if(current_hour < g_trade_start_hour || current_hour >= g_trade_end_hour)
         {
            if(mp_logger && g_debug_mode)
               mp_logger.Info(StringFormat("Outside trading hours: %d (allowed: %d-%d)", 
                                            current_hour, g_trade_start_hour, g_trade_end_hour));
            return false;
         }
      }
      else
      {
         // Overnight case: e.g., 20:00 to 8:00
         if(current_hour < g_trade_start_hour && current_hour >= g_trade_end_hour)
         {
            if(mp_logger && g_debug_mode)
               mp_logger.Info(StringFormat("Outside trading hours: %d (allowed: %d-%d)", 
                                            current_hour, g_trade_start_hour, g_trade_end_hour));
            return false;
         }
      }

      return true;
   }

   // Calculate stop loss price in absolute terms
   double CalculateStopLossPrice(bool buy)
   {
      double bid = mp_market_data.GetBid();
      double ask = mp_market_data.GetAsk();
      double entry_price = buy ? ask : bid;
      double sl_distance = CUtilities::PointsToPrice(mp_market_data.GetSymbol(), g_stop_loss_points);
      
      double sl_price = buy ? (entry_price - sl_distance) : (entry_price + sl_distance);
      
      return CUtilities::NormalizePrice(mp_market_data.GetSymbol(), sl_price);
   }

   // Calculate take profit price in absolute terms
   double CalculateTakeProfitPrice(bool buy)
   {
      double bid = mp_market_data.GetBid();
      double ask = mp_market_data.GetAsk();
      double entry_price = buy ? ask : bid;
      double tp_distance = CUtilities::PointsToPrice(mp_market_data.GetSymbol(), g_take_profit_points);
      
      double tp_price = buy ? (entry_price + tp_distance) : (entry_price - tp_distance);
      
      return CUtilities::NormalizePrice(mp_market_data.GetSymbol(), tp_price);
   }

   // Get market data reference
   CMarketData* GetMarketData()
   {
      return mp_market_data;
   }
};

#endif //__RISKMANAGER_MQH__