EA/Buffer EA/Include/StateManager.mqh

//+------------------------------------------------------------------+
//|                                                       StateManager.mqh |
//|                                    Universal Buffer Reader EA v2.0 |
//+------------------------------------------------------------------+
#property copyright "Copyright 2025"
#property link      ""
#property version   "1.00"
#property strict

//+------------------------------------------------------------------+
//| CStateManager - Manages persistent state using Global Variables   |
//+------------------------------------------------------------------+
class CStateManager
{
private:
    string              m_symbol;
    int                 m_magic_number;
    string              m_prefix;

    string              m_gv_accum_loss;
    string              m_gv_consec_loss;

    // Logging
    bool                m_enable_debug;

public:
    //+------------------------------------------------------------------+
    //| Constructor                                                      |
    //+------------------------------------------------------------------+
    CStateManager()
    {
        m_symbol = "";
        m_magic_number = 0;
        m_prefix = "UnivBufEA";
        m_enable_debug = false;

        m_gv_accum_loss = "";
        m_gv_consec_loss = "";
    }

    //+------------------------------------------------------------------+
    //| Destructor                                                       |
    //+------------------------------------------------------------------+
    ~CStateManager()
    {
    }

    //+------------------------------------------------------------------+
    //| Set parameters                                                   |
    //+------------------------------------------------------------------+
    void SetParameters(string symbol, int magic_number, bool enable_debug = false)
    {
        // Validate parameters
        if(symbol == "")
        {
            Print("[ERROR] Invalid symbol: empty string");
        }
        m_symbol = symbol;

        if(magic_number <= 0)
        {
            Print("[ERROR] Invalid magic number: ", magic_number, ". Using default 24680");
            m_magic_number = 24680;
        }
        else
        {
            m_magic_number = magic_number;
        }

        m_enable_debug = enable_debug;

        // Build Global Variable names
        m_gv_accum_loss = BuildGVName("_AccumLoss");
        m_gv_consec_loss = BuildGVName("_ConsecLoss");

        if(m_enable_debug)
        {
            Print("[StateManager] Parameters set:");
            Print("  Symbol: ", m_symbol);
            Print("  Magic number: ", m_magic_number);
            Print("  GV Accum Loss: ", m_gv_accum_loss);
            Print("  GV Consec Loss: ", m_gv_consec_loss);
        }
    }

    //+------------------------------------------------------------------+
    //| Set debug mode                                                   |
    //+------------------------------------------------------------------+
    void SetDebugMode(bool enable_debug)
    {
        m_enable_debug = enable_debug;
    }

    //+------------------------------------------------------------------+
    //| Load state from Global Variables                                |
    //+------------------------------------------------------------------+
    bool LoadState(double &accumulated_loss, int &consecutive_losses)
    {
        if(m_enable_debug)
        {
            Print("[StateManager] Loading state...");
        }

        accumulated_loss = 0;
        consecutive_losses = 0;

        // Load accumulated loss
        if(GlobalVariableCheck(m_gv_accum_loss))
        {
            accumulated_loss = GlobalVariableGet(m_gv_accum_loss);

            // Validate accumulated loss
            if(accumulated_loss < 0)
            {
                Print("[WARNING] Invalid accumulated loss found: ", accumulated_loss, ". Resetting to 0");
                accumulated_loss = 0;
                GlobalVariableSet(m_gv_accum_loss, 0);
            }

            Print("[StateManager] Loaded accumulated loss: ", DoubleToString(accumulated_loss, 2));
        }
        else
        {
            if(!GlobalVariableSet(m_gv_accum_loss, 0))
            {
                Print("[ERROR] Failed to initialize accumulated loss Global Variable");
                return false;
            }
            Print("[StateManager] Initialized accumulated loss: 0");
        }

        // Load consecutive losses
        if(GlobalVariableCheck(m_gv_consec_loss))
        {
            consecutive_losses = (int)GlobalVariableGet(m_gv_consec_loss);

            // Validate consecutive losses
            if(consecutive_losses < 0)
            {
                Print("[WARNING] Invalid consecutive losses found: ", consecutive_losses, ". Resetting to 0");
                consecutive_losses = 0;
                GlobalVariableSet(m_gv_consec_loss, 0);
            }

            Print("[StateManager] Loaded consecutive losses: ", consecutive_losses);
        }
        else
        {
            if(!GlobalVariableSet(m_gv_consec_loss, 0))
            {
                Print("[ERROR] Failed to initialize consecutive losses Global Variable");
                return false;
            }
            Print("[StateManager] Initialized consecutive losses: 0");
        }

        if(m_enable_debug)
        {
            Print("[StateManager] State loaded successfully");
        }

        return true;
    }

    //+------------------------------------------------------------------+
    //| Save state to Global Variables                                  |
    //+------------------------------------------------------------------+
    bool SaveState(double accumulated_loss, int consecutive_losses)
    {
        if(m_enable_debug)
        {
            Print("[StateManager] Saving state...");
            Print("  Accumulated loss: ", DoubleToString(accumulated_loss, 2));
            Print("  Consecutive losses: ", consecutive_losses);
        }

        // Validate inputs
        if(accumulated_loss < 0)
        {
            Print("[ERROR] Invalid accumulated loss to save: ", accumulated_loss);
            return false;
        }

        if(consecutive_losses < 0)
        {
            Print("[ERROR] Invalid consecutive losses to save: ", consecutive_losses);
            return false;
        }

        bool result = true;

        // Save accumulated loss
        if(!GlobalVariableSet(m_gv_accum_loss, accumulated_loss))
        {
            int error = GetLastError();
            Print("[ERROR] Failed to save accumulated loss. Error code: ", error);
            result = false;
        }

        // Save consecutive losses
        if(!GlobalVariableSet(m_gv_consec_loss, consecutive_losses))
        {
            int error = GetLastError();
            Print("[ERROR] Failed to save consecutive losses. Error code: ", error);
            result = false;
        }

        if(result && m_enable_debug)
        {
            Print("[StateManager] State saved successfully");
        }

        return result;
    }

    //+------------------------------------------------------------------+
    //| Clear state (for backtesting)                                   |
    //+------------------------------------------------------------------+
    bool ClearState()
    {
        if(m_enable_debug)
        {
            Print("[StateManager] Clearing state...");
        }

        bool result = true;

        // Delete accumulated loss
        if(GlobalVariableCheck(m_gv_accum_loss))
        {
            if(!GlobalVariableDel(m_gv_accum_loss))
            {
                int error = GetLastError();
                Print("[ERROR] Failed to delete accumulated loss. Error code: ", error);
                result = false;
            }
            else
            {
                Print("[StateManager] Deleted accumulated loss Global Variable");
            }
        }
        else
        {
            Print("[StateManager] Accumulated loss Global Variable not found (already cleared)");
        }

        // Delete consecutive losses
        if(GlobalVariableCheck(m_gv_consec_loss))
        {
            if(!GlobalVariableDel(m_gv_consec_loss))
            {
                int error = GetLastError();
                Print("[ERROR] Failed to delete consecutive losses. Error code: ", error);
                result = false;
            }
            else
            {
                Print("[StateManager] Deleted consecutive losses Global Variable");
            }
        }
        else
        {
            Print("[StateManager] Consecutive losses Global Variable not found (already cleared)");
        }

        if(result)
        {
            Print("[StateManager] State cleared successfully");
        }

        return result;
    }

    //+------------------------------------------------------------------+
    //| Get Global Variable names                                       |
    //+------------------------------------------------------------------+
    void GetGVNames(string &accum_loss_name, string &consec_loss_name)
    {
        accum_loss_name = m_gv_accum_loss;
        consec_loss_name = m_gv_consec_loss;
    }

    //+------------------------------------------------------------------+
    //| Check if state exists                                           |
    //+------------------------------------------------------------------+
    bool StateExists()
    {
        bool accum_exists = GlobalVariableCheck(m_gv_accum_loss);
        bool consec_exists = GlobalVariableCheck(m_gv_consec_loss);

        return (accum_exists || consec_exists);
    }

private:
    //+------------------------------------------------------------------+
    //| Build Global Variable name                                      |
    //+------------------------------------------------------------------+
    string BuildGVName(string suffix)
    {
        return m_prefix + "_" + m_symbol + "_" + IntegerToString(m_magic_number) + suffix;
    }
};
//+------------------------------------------------------------------+