// ZmqMql4Connector.mqh

// Define the ZMQ message callback function type
typedef void OnZmqMessageReceived(string message);

class CZmqMql4Server
{
private:
    string m_endpoint;                  // ZeroMQ server endpoint
    int m_socket;                       // ZeroMQ socket
    int m_context;                      // ZeroMQ context
    OnZmqMessageReceived @m_callback;   // Message callback function

public:
    // Constructor
    CZmqMql4Server()
    {
        m_socket = -1;
        m_context = -1;
    }

    // Destructor
    ~CZmqMql4Server()
    {
        Deinitialize();
    }

    // Initialize the ZeroMQ server
    bool Initialize(string endpoint, OnZmqMessageReceived @callback)
    {
        m_endpoint = endpoint;
        m_callback = @callback;

        m_context = zmq_init(1);
        if (m_context == -1)
            return false;

        m_socket = zmq_socket(m_context, ZMQ_REP);
        if (m_socket == -1)
            return false;

        int bindResult = zmq_bind(m_socket, m_endpoint);
        if (bindResult == -1)
            return false;

        return true;
    }

    // Start the ZeroMQ server
    bool Start()
    {
        if (m_socket == -1 || m_context == -1)
            return false;

        while (true)
        {
            string message = Receive();
            if (message != "")
                m_callback(message);
        }

        return true;
    }

    // Stop the ZeroMQ server
    void Stop()
    {
        if (m_socket != -1)
            zmq_close(m_socket);
        m_socket = -1;
    }

    // Send a message from the server
    void Send(string message)
    {
        if (m_socket != -1)
            zmq_send(m_socket, message, StringLen(message), 0);
    }

    // Receive a message in the server
    string Receive()
    {
        if (m_socket != -1)
        {
            string message;
            int receivedBytes = zmq_recv(m_socket, message, 4096, 0);
            if (receivedBytes > 0)
                return message;
        }

        return "";
    }

    // Deinitialize the ZeroMQ server
    void Deinitialize()
    {
        if (m_socket != -1)
            zmq_close(m_socket);
        if (m_context != -1)
            zmq_term(m_context);

        m_socket = -1;
        m_context = -1;
    }
};