#pragma once

#include <optional>

#include "NotifierInterface.hpp"

/**
 * RAII wrapper for a Linux eventfd object, used to implement the NotifierInterface.
 */
class EventFdNotifier: public NotifierInterface
{
public:
    EventFdNotifier();

    /*
     * EventNotifier objects should not be copied.
     */
    EventFdNotifier(EventFdNotifier& other) = delete;
    EventFdNotifier& operator = (EventFdNotifier& other) = delete;

    /*
     * TODO: Implement this. For now, use the move constructor.
     */
    EventFdNotifier& operator = (EventFdNotifier&& other) = delete;

    EventFdNotifier(EventFdNotifier&& other) noexcept;
    ~EventFdNotifier() noexcept override;

    [[nodiscard]] int getFileDescriptor() const {
        return this->fileDescriptor.value();
    }

    void notify() override;

    void clear();

private:
    std::optional<int> fileDescriptor;

    void close();
};