mql5/Experts/Advisors/Modules/RiskManager.mqh

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+
//|                                                  RiskManager.mqh |
//|                    Fixed Risk Management Implementation          |
//+------------------------------------------------------------------+
#ifndef RISK_MANAGER_MQH
#define RISK_MANAGER_MQH

#include "DataTypes.mqh"
#include "Utilities.mqh"

//+------------------------------------------------------------------+
//| Risk Manager Class                                               |
//+------------------------------------------------------------------+
class CRiskManager
{
private:
    //--- Member Variables - Complete Declaration
    CUtilities*         m_pUtils;              // Utilities pointer
    RiskParameters      m_params;              // Risk parameters
    bool                m_isInitialized;       // Initialization flag
    
    //--- Risk Limits
    double              m_maxRiskPerTrade;     // Max risk per trade (%)
    double              m_maxDailyLoss;        // Max daily loss (%)
    double              m_maxDrawdown;         // Max drawdown (%)
    double              m_maxLeverage;         // Max leverage
    int                 m_maxPositions;        // Max concurrent positions
    double              m_maxCorrelation;      // Max correlation threshold
    
    //--- Current State
    double              m_currentDailyLoss;    // Today's loss
    double              m_currentDrawdown;     // Current drawdown
    double              m_peakBalance;         // Peak balance for DD calc
    datetime            m_lastResetTime;       // Last daily reset
    
    //--- Position Tracking
    PositionRisk        m_positions[];         // Array of position risks
    int                 m_positionCount;       // Current position count
    
    //--- Risk Metrics Cache
    RiskMetrics         m_currentMetrics;      // Current risk metrics
    datetime            m_lastUpdateTime;      // Last metrics update
    
    //--- Private Methods
    void                UpdateDailyMetrics();
    void                UpdateDrawdown();
    void                CalculatePositionRisks();
    double              CalculateCorrelation(const double &prices1[], const double &prices2[]);
    bool                CheckRiskLimits(double proposedRisk);
    void                LogRiskEvent(ENUM_RISK_EVENT event, string details);
    double              InternalCalculateLotSize(double riskAmount, double stopLossPoints, string symbol);
    
public:
    //--- Constructor/Destructor
    CRiskManager();
    ~CRiskManager();
    
    //--- Initialization
    bool                Initialize(CUtilities* utils, const RiskParameters &params);
    void                Deinitialize();
    
    //--- Risk Calculation Methods
    double              CalculatePositionSize(double stopLossPoints, string symbol = NULL);
    double              CalculatePositionSizeByMethod(ENUM_POSITION_SIZING method, 
                                                      double balance, 
                                                      double stopLossPoints,
                                                      string symbol = NULL);
    double              CalculateRiskAmount(double balance, double riskPercent);
    
    //--- Risk Assessment
    bool                CanOpenNewPosition(string symbol, double proposedVolume);
    bool                IsRiskLimitExceeded();
    RiskMetrics         GetCurrentRiskMetrics();
    double              GetAvailableRisk();
    
    //--- Stop Loss Calculation
    double              CalculateStopLoss(double entryPrice, bool isBuy, 
                                          ENUM_SL_MODE mode, string symbol = NULL);
    double              CalculateTakeProfit(double entryPrice, double stopLoss, 
                                            bool isBuy, double riskRewardRatio);
    
    //--- Risk Monitoring
    void                UpdateRiskMetrics();
    ENUM_RISK_ACTION    EvaluateRiskAction();
    void                ExecuteRiskAction(ENUM_RISK_ACTION action);
    
    //--- Utility Methods
    double              GetATR(string symbol, ENUM_TIMEFRAMES timeframe, int period);
    double              GetVolatility(string symbol);
    bool                IsHighVolatility(string symbol);
    
    //--- Getters
    bool                IsInitialized() { return m_isInitialized; }
    double              GetMaxRiskPerTrade() { return m_maxRiskPerTrade; }
    double              GetCurrentDrawdown() { return m_currentDrawdown; }
    int                 GetOpenPositionCount() { return m_positionCount; }
};

//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CRiskManager::CRiskManager()
{
    m_pUtils = NULL;
    m_isInitialized = false;
    m_maxRiskPerTrade = 1.0;
    m_maxDailyLoss = 5.0;
    m_maxDrawdown = 20.0;
    m_maxLeverage = 10.0;
    m_maxPositions = 5;
    m_maxCorrelation = 0.7;
    m_currentDailyLoss = 0;
    m_currentDrawdown = 0;
    m_peakBalance = 0;
    m_lastResetTime = 0;
    m_positionCount = 0;
    m_lastUpdateTime = 0;
    
    ArrayResize(m_positions, 0);
}

//+------------------------------------------------------------------+
//| Destructor                                                       |
//+------------------------------------------------------------------+
CRiskManager::~CRiskManager()
{
    Deinitialize();
}

//+------------------------------------------------------------------+
//| Initialize Risk Manager                                          |
//+------------------------------------------------------------------+
bool CRiskManager::Initialize(CUtilities* utils, const RiskParameters &params)
{
    if(utils == NULL)
    {
        Print("RiskManager: Invalid utilities pointer");
        return false;
    }
    
    m_pUtils = utils;
    m_params = params;
    
    // Store parameters
    m_maxRiskPerTrade = params.maxRiskPerTrade;
    m_maxDailyLoss = params.maxDailyRisk;
    m_maxDrawdown = params.maxDrawdown;
    m_maxLeverage = params.maxLeverage;
    m_maxPositions = params.maxPositions;
    m_maxCorrelation = params.maxCorrelation;
    
    // Initialize tracking
    m_peakBalance = AccountInfoDouble(ACCOUNT_BALANCE);
    m_lastResetTime = TimeCurrent();
    m_currentDailyLoss = 0;
    m_currentDrawdown = 0;
    
    // Log initialization
    CLogger::Log(LOG_INFO, "Risk Manager initialized");
    CLogger::Log(LOG_INFO, StringFormat("Max Risk Per Trade: %.2f%%", m_maxRiskPerTrade));
    CLogger::Log(LOG_INFO, StringFormat("Max Daily Loss: %.2f%%", m_maxDailyLoss));
    CLogger::Log(LOG_INFO, StringFormat("Max Drawdown: %.2f%%", m_maxDrawdown));
    CLogger::Log(LOG_INFO, StringFormat("Max Positions: %d", m_maxPositions));
    
    m_isInitialized = true;
    return true;
}

//+------------------------------------------------------------------+
//| Deinitialize                                                     |
//+------------------------------------------------------------------+
void CRiskManager::Deinitialize()
{
    ArrayFree(m_positions);
    m_isInitialized = false;
    CLogger::Log(LOG_INFO, "Risk Manager deinitialized");
}

//+------------------------------------------------------------------+
//| Calculate Position Size                                          |
//+------------------------------------------------------------------+
double CRiskManager::CalculatePositionSize(double stopLossPoints, string symbol)
{
    if(!m_isInitialized) return 0;
    if(symbol == NULL) symbol = _Symbol;
    
    double balance = AccountInfoDouble(ACCOUNT_BALANCE);
    double riskAmount = CalculateRiskAmount(balance, m_maxRiskPerTrade);
    
    return InternalCalculateLotSize(riskAmount, stopLossPoints, symbol);
}

//+------------------------------------------------------------------+
//| Internal Calculate Lot Size                                      |
//+------------------------------------------------------------------+
double CRiskManager::InternalCalculateLotSize(double riskAmount, double stopLossPoints, string symbol)
{
    if(stopLossPoints <= 0) return 0;
    
    double tickValue = SymbolInfoDouble(symbol, SYMBOL_TRADE_TICK_VALUE);
    double tickSize = SymbolInfoDouble(symbol, SYMBOL_TRADE_TICK_SIZE);
    double minLot = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN);
    double maxLot = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MAX);
    double lotStep = SymbolInfoDouble(symbol, SYMBOL_VOLUME_STEP);
    
    if(tickSize <= 0 || tickValue <= 0) return minLot;
    
    double lotSize = (riskAmount * tickSize) / (stopLossPoints * tickValue);
    
    // Round to lot step
    lotSize = MathFloor(lotSize / lotStep) * lotStep;
    
    // Apply limits
    if(lotSize < minLot) lotSize = minLot;
    if(lotSize > maxLot) lotSize = maxLot;
    
    return NormalizeDouble(lotSize, 2);
}

//+------------------------------------------------------------------+
//| Calculate Position Size by Method                                |
//+------------------------------------------------------------------+
double CRiskManager::CalculatePositionSizeByMethod(ENUM_POSITION_SIZING method, 
                                                   double balance, 
                                                   double stopLossPoints,
                                                   string symbol)
{
    if(!m_isInitialized) return 0;
    if(symbol == NULL) symbol = _Symbol;
    if(stopLossPoints <= 0) return 0;
    
    double lotSize = 0;
    double riskAmount = CalculateRiskAmount(balance, m_maxRiskPerTrade);
    
    switch(method)
    {
        case POSITION_SIZE_FIXED:
            lotSize = 0.01;
            break;
            
        case POSITION_SIZE_RISK:
            lotSize = InternalCalculateLotSize(riskAmount, stopLossPoints, symbol);
            break;
            
        case POSITION_SIZE_VOLATILITY:
            {
                double atr = GetATR(symbol, PERIOD_CURRENT, 14);
                if(atr > 0)
                {
                    double adjustedStop = atr * 2.0;
                    double adjustedRisk = riskAmount * 0.75;
                    lotSize = InternalCalculateLotSize(adjustedRisk, adjustedStop, symbol);
                }
                else
                {
                    lotSize = 0.01;
                }
            }
            break;
            
        case POSITION_SIZE_KELLY:
            {
                double winRate = 0.55;
                double avgWinLoss = 1.5;
                double kellyPercent = (winRate * avgWinLoss - (1 - winRate)) / avgWinLoss;
                kellyPercent = MathMax(0, MathMin(kellyPercent, 0.25));
                
                double kellyRisk = balance * kellyPercent;
                lotSize = InternalCalculateLotSize(kellyRisk, stopLossPoints, symbol);
            }
            break;
            
        default:
            lotSize = 0.01;
            break;
    }
    
    // Apply limits
    double minLot = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN);
    double maxLot = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MAX);
    double lotStep = SymbolInfoDouble(symbol, SYMBOL_VOLUME_STEP);
    
    lotSize = MathFloor(lotSize / lotStep) * lotStep;
    lotSize = MathMax(minLot, MathMin(maxLot, lotSize));
    
    return NormalizeDouble(lotSize, 2);
}

//+------------------------------------------------------------------+
//| Calculate Risk Amount                                            |
//+------------------------------------------------------------------+
double CRiskManager::CalculateRiskAmount(double balance, double riskPercent)
{
    return balance * (riskPercent / 100.0);
}

//+------------------------------------------------------------------+
//| Check if Can Open New Position                                   |
//+------------------------------------------------------------------+
bool CRiskManager::CanOpenNewPosition(string symbol, double proposedVolume)
{
    if(!m_isInitialized) return false;
    
    // Check position count
    if(m_positionCount >= m_maxPositions)
    {
        LogRiskEvent(RISK_OVERLEVERAGED, "Max positions reached");
        return false;
    }
    
    // Check daily loss
    if(m_currentDailyLoss >= m_maxDailyLoss)
    {
        LogRiskEvent(RISK_DAILY_LOSS_LIMIT, "Daily loss limit reached");
        return false;
    }
    
    // Check drawdown
    if(m_currentDrawdown >= m_maxDrawdown)
    {
        LogRiskEvent(RISK_DRAWDOWN_LIMIT, "Drawdown limit reached");
        return false;
    }
    
    // Check margin
    double requiredMargin = 0;
    if(!OrderCalcMargin(ORDER_TYPE_BUY, symbol, proposedVolume, 
                        SymbolInfoDouble(symbol, SYMBOL_ASK), requiredMargin))
    {
        return false;
    }
    
    double freeMargin = AccountInfoDouble(ACCOUNT_MARGIN_FREE);
    if(requiredMargin > freeMargin * 0.9)  // Keep 10% buffer
    {
        LogRiskEvent(RISK_MARGIN_CALL, "Insufficient margin");
        return false;
    }
    
    return true;
}

//+------------------------------------------------------------------+
//| Check if Risk Limit Exceeded                                     |
//+------------------------------------------------------------------+
bool CRiskManager::IsRiskLimitExceeded()
{
    UpdateRiskMetrics();
    
    if(m_currentMetrics.totalRisk > m_maxRiskPerTrade) return true;
    if(m_currentMetrics.currentDrawdown > m_maxDrawdown) return true;
    if(m_currentMetrics.dailyLossPercent > m_maxDailyLoss) return true;
    if(m_currentMetrics.leverage > m_maxLeverage) return true;
    if(m_currentMetrics.marginLevel < 100 && m_currentMetrics.marginLevel > 0) return true;
    
    return false;
}

//+------------------------------------------------------------------+
//| Get Current Risk Metrics                                         |
//+------------------------------------------------------------------+
RiskMetrics CRiskManager::GetCurrentRiskMetrics()
{
    UpdateRiskMetrics();
    return m_currentMetrics;
}

//+------------------------------------------------------------------+
//| Get Available Risk                                               |
//+------------------------------------------------------------------+
double CRiskManager::GetAvailableRisk()
{
    double usedRisk = m_currentMetrics.totalRisk;
    double availableRisk = m_maxRiskPerTrade - usedRisk;
    return MathMax(0, availableRisk);
}

//+------------------------------------------------------------------+
//| Calculate Stop Loss                                              |
//+------------------------------------------------------------------+
double CRiskManager::CalculateStopLoss(double entryPrice, bool isBuy, 
                                        ENUM_SL_MODE mode, string symbol)
{
    if(symbol == NULL) symbol = _Symbol;
    
    double sl = 0;
    double point = SymbolInfoDouble(symbol, SYMBOL_POINT);
    int digits = (int)SymbolInfoInteger(symbol, SYMBOL_DIGITS);
    
    switch(mode)
    {
        case SL_FIXED:
            sl = isBuy ? entryPrice - (100 * point) : entryPrice + (100 * point);
            break;
            
        case SL_ATR:
            {
                double atr = GetATR(symbol, PERIOD_CURRENT, 14);
                if(atr > 0)
                {
                    sl = isBuy ? entryPrice - (atr * 2.0) : entryPrice + (atr * 2.0);
                }
                else
                {
                    sl = isBuy ? entryPrice - (100 * point) : entryPrice + (100 * point);
                }
            }
            break;
            
        case SL_PERCENTAGE:
            sl = isBuy ? entryPrice * 0.98 : entryPrice * 1.02;
            break;
            
        default:
            sl = isBuy ? entryPrice - (100 * point) : entryPrice + (100 * point);
            break;
    }
    
    return NormalizeDouble(sl, digits);
}

//+------------------------------------------------------------------+
//| Calculate Take Profit                                            |
//+------------------------------------------------------------------+
double CRiskManager::CalculateTakeProfit(double entryPrice, double stopLoss, 
                                         bool isBuy, double riskRewardRatio)
{
    double risk = MathAbs(entryPrice - stopLoss);
    double reward = risk * riskRewardRatio;
    
    double tp = isBuy ? entryPrice + reward : entryPrice - reward;
    
    string symbol = _Symbol;
    int digits = (int)SymbolInfoInteger(symbol, SYMBOL_DIGITS);
    
    return NormalizeDouble(tp, digits);
}

//+------------------------------------------------------------------+
//| Update Risk Metrics                                              |
//+------------------------------------------------------------------+
void CRiskManager::UpdateRiskMetrics()
{
    // Update daily metrics if new day
    UpdateDailyMetrics();
    
    // Update drawdown
    UpdateDrawdown();
    
    // Calculate position risks
    CalculatePositionRisks();
    
    // Calculate total metrics
    double totalRisk = 0;
    double totalExposure = 0;
    
    for(int i = 0; i < m_positionCount; i++)
    {
        totalRisk += m_positions[i].riskPercent;
        totalExposure += m_positions[i].volume * m_positions[i].marginUsed;
    }
    
    // Update metrics structure
    m_currentMetrics.totalRisk = totalRisk;
    m_currentMetrics.maxRisk = m_maxRiskPerTrade;
    m_currentMetrics.currentDrawdown = m_currentDrawdown;
    m_currentMetrics.maxDrawdown = m_maxDrawdown;
    m_currentMetrics.dailyLoss = m_currentDailyLoss;
    m_currentMetrics.dailyLossPercent = (AccountInfoDouble(ACCOUNT_BALANCE) > 0) ? 
                                        (m_currentDailyLoss / AccountInfoDouble(ACCOUNT_BALANCE)) * 100 : 0;
    m_currentMetrics.marginLevel = AccountInfoDouble(ACCOUNT_MARGIN_LEVEL);
    m_currentMetrics.freeMargin = AccountInfoDouble(ACCOUNT_MARGIN_FREE);
    m_currentMetrics.leverage = (AccountInfoDouble(ACCOUNT_EQUITY) > 0) ?
                                totalExposure / AccountInfoDouble(ACCOUNT_EQUITY) : 0;
    m_currentMetrics.openPositions = m_positionCount;
    
    m_lastUpdateTime = TimeCurrent();
}

//+------------------------------------------------------------------+
//| Update Daily Metrics                                             |
//+------------------------------------------------------------------+
void CRiskManager::UpdateDailyMetrics()
{
    MqlDateTime current, last;
    TimeToStruct(TimeCurrent(), current);
    TimeToStruct(m_lastResetTime, last);
    
    // Reset daily metrics if new day
    if(current.day != last.day || current.mon != last.mon || current.year != last.year)
    {
        m_currentDailyLoss = 0;
        m_lastResetTime = TimeCurrent();
        CLogger::Log(LOG_INFO, "Daily risk metrics reset");
    }
}

//+------------------------------------------------------------------+
//| Update Drawdown                                                  |
//+------------------------------------------------------------------+
void CRiskManager::UpdateDrawdown()
{
    double currentBalance = AccountInfoDouble(ACCOUNT_BALANCE);
    
    if(currentBalance > m_peakBalance)
    {
        m_peakBalance = currentBalance;
    }
    
    if(m_peakBalance > 0)
    {
        m_currentDrawdown = ((m_peakBalance - currentBalance) / m_peakBalance) * 100;
    }
    else
    {
        m_currentDrawdown = 0;
    }
}

//+------------------------------------------------------------------+
//| Calculate Position Risks                                         |
//+------------------------------------------------------------------+
void CRiskManager::CalculatePositionRisks()
{
    ArrayResize(m_positions, 0);
    m_positionCount = 0;
    
    for(int i = PositionsTotal() - 1; i >= 0; i--)
    {
        ulong ticket = PositionGetTicket(i);
        if(ticket > 0 && PositionSelectByTicket(ticket))
        {
            PositionRisk risk;
            risk.ticket = ticket;
            risk.symbol = PositionGetString(POSITION_SYMBOL);
            risk.volume = PositionGetDouble(POSITION_VOLUME);
            
            double openPrice = PositionGetDouble(POSITION_PRICE_OPEN);
            double currentPrice = PositionGetDouble(POSITION_PRICE_CURRENT);
            double stopLoss = PositionGetDouble(POSITION_SL);
            
            // Calculate risk amount
            if(stopLoss > 0)
            {
                double riskPoints = MathAbs(openPrice - stopLoss);
                double tickValue = SymbolInfoDouble(risk.symbol, SYMBOL_TRADE_TICK_VALUE);
                double tickSize = SymbolInfoDouble(risk.symbol, SYMBOL_TRADE_TICK_SIZE);
                
                if(tickSize > 0)
                {
                    risk.riskAmount = (riskPoints / tickSize) * tickValue * risk.volume;
                }
            }
            
            risk.riskPercent = (AccountInfoDouble(ACCOUNT_BALANCE) > 0) ?
                              (risk.riskAmount / AccountInfoDouble(ACCOUNT_BALANCE)) * 100 : 0;
            risk.currentLoss = PositionGetDouble(POSITION_PROFIT);
            
            // Calculate margin used (MQL5 doesn't have POSITION_MARGIN directly)
            double marginInit = 0;
            double marginMaint = 0;
            if(OrderCalcMargin(ORDER_TYPE_BUY, risk.symbol, risk.volume, 
                              openPrice, marginInit))
            {
                risk.marginUsed = marginInit;
            }
            else
            {
                risk.marginUsed = 0;
            }
            
            ArrayResize(m_positions, m_positionCount + 1);
            m_positions[m_positionCount] = risk;
            m_positionCount++;
        }
    }
}

//+------------------------------------------------------------------+
//| Evaluate Risk Action                                             |
//+------------------------------------------------------------------+
ENUM_RISK_ACTION CRiskManager::EvaluateRiskAction()
{
    if(!m_isInitialized) return ACTION_NONE;
    
    UpdateRiskMetrics();
    
    // Critical - close all
    if(m_currentMetrics.marginLevel < 50 && m_currentMetrics.marginLevel > 0)
        return ACTION_CLOSE_ALL;
        
    if(m_currentMetrics.currentDrawdown > m_maxDrawdown)
        return ACTION_CLOSE_ALL;
        
    // High risk - close partial
    if(m_currentMetrics.dailyLossPercent > m_maxDailyLoss * 0.8)
        return ACTION_CLOSE_PARTIAL;
        
    if(m_currentMetrics.totalRisk > m_maxRiskPerTrade * 0.9)
        return ACTION_REDUCE_SIZE;
        
    // Warning only
    if(m_currentMetrics.leverage > m_maxLeverage * 0.8)
        return ACTION_WARN;
        
    return ACTION_NONE;
}

//+------------------------------------------------------------------+
//| Execute Risk Action                                              |
//+------------------------------------------------------------------+
void CRiskManager::ExecuteRiskAction(ENUM_RISK_ACTION action)
{
    switch(action)
    {
        case ACTION_WARN:
            Alert("Risk Warning: Approaching risk limits");
            break;
            
        case ACTION_REDUCE_SIZE:
            CLogger::Log(LOG_WARNING, "Reducing position sizes due to high risk");
            break;
            
        case ACTION_CLOSE_PARTIAL:
            CLogger::Log(LOG_WARNING, "Closing partial positions due to risk limits");
            break;
            
        case ACTION_CLOSE_ALL:
            CLogger::Log(LOG_ERROR, "EMERGENCY: Closing all positions");
            break;
            
        case ACTION_STOP_TRADING:
            CLogger::Log(LOG_ERROR, "Trading suspended due to risk limits");
            break;
            
        default:
            break;
    }
}

//+------------------------------------------------------------------+
//| Get ATR Value                                                    |
//+------------------------------------------------------------------+
double CRiskManager::GetATR(string symbol, ENUM_TIMEFRAMES timeframe, int period)
{
    int atrHandle = iATR(symbol, timeframe, period);
    if(atrHandle == INVALID_HANDLE) return 0;
    
    double atr[];
    ArraySetAsSeries(atr, true);
    
    if(CopyBuffer(atrHandle, 0, 0, 1, atr) <= 0)
    {
        IndicatorRelease(atrHandle);
        return 0;
    }
    
    IndicatorRelease(atrHandle);
    return atr[0];
}

//+------------------------------------------------------------------+
//| Get Volatility                                                   |
//+------------------------------------------------------------------+
double CRiskManager::GetVolatility(string symbol)
{
    return GetATR(symbol, PERIOD_H1, 14);
}

//+------------------------------------------------------------------+
//| Check if High Volatility                                         |
//+------------------------------------------------------------------+
bool CRiskManager::IsHighVolatility(string symbol)
{
    double currentVol = GetVolatility(symbol);
    double avgVol = GetATR(symbol, PERIOD_D1, 20);
    
    return (avgVol > 0 && currentVol > avgVol * 1.5);
}

//+------------------------------------------------------------------+
//| Calculate Correlation                                            |
//+------------------------------------------------------------------+
double CRiskManager::CalculateCorrelation(const double &prices1[], const double &prices2[])
{
    int n = MathMin(ArraySize(prices1), ArraySize(prices2));
    if(n < 2) return 0;
    
    double sumX = 0, sumY = 0, sumXY = 0, sumX2 = 0, sumY2 = 0;
    
    for(int i = 0; i < n; i++)
    {
        sumX += prices1[i];
        sumY += prices2[i];
        sumXY += prices1[i] * prices2[i];
        sumX2 += prices1[i] * prices1[i];
        sumY2 += prices2[i] * prices2[i];
    }
    
    double numerator = n * sumXY - sumX * sumY;
    double denominator = MathSqrt((n * sumX2 - sumX * sumX) * (n * sumY2 - sumY * sumY));
    
    if(denominator == 0) return 0;
    
    return numerator / denominator;
}

//+------------------------------------------------------------------+
//| Check Risk Limits                                                |
//+------------------------------------------------------------------+
bool CRiskManager::CheckRiskLimits(double proposedRisk)
{
    double totalRisk = m_currentMetrics.totalRisk + proposedRisk;
    return (totalRisk <= m_maxRiskPerTrade);
}

//+------------------------------------------------------------------+
//| Log Risk Event                                                   |
//+------------------------------------------------------------------+
void CRiskManager::LogRiskEvent(ENUM_RISK_EVENT event, string details)
{
    // Log the risk event directly using CUtilities static method
    string eventName = "";
    switch(event)
    {
        case RISK_OVERLEVERAGED:    eventName = "OVERLEVERAGED"; break;
        case RISK_CORRELATION_HIGH:  eventName = "HIGH_CORRELATION"; break;
        case RISK_DRAWDOWN_LIMIT:    eventName = "DRAWDOWN_LIMIT"; break;
        case RISK_DAILY_LOSS_LIMIT:  eventName = "DAILY_LOSS_LIMIT"; break;
        case RISK_MARGIN_CALL:       eventName = "MARGIN_CALL"; break;
        case RISK_VOLATILITY_SPIKE:  eventName = "VOLATILITY_SPIKE"; break;
        case RISK_LIQUIDITY_ISSUE:   eventName = "LIQUIDITY_ISSUE"; break;
        default:                     eventName = "UNKNOWN"; break;
    }
    
    // Log the event
    CLogger::Log(LOG_WARNING, "Risk Event: " + eventName);
    
    // Log details if provided
    if(details != "")
    {
        CLogger::Log(LOG_WARNING, "Risk Event Details: " + details);
    }
    
    // Also call the static CUtilities method if you want to use it
    // Note: CUtilities::LogRiskEvent is a static method that takes only the event parameter
    CUtilities::LogRiskEvent(event);
}

#endif // RISK_MANAGER_MQH