#pragma once

/*                          MOUNT CONTROL COMPONENTS LIBRARY                            */


/*                          GENERIC MOUNT REFERENCE IMPLEMENTATION                          */


#include "mcc_defaults.h"
#include "mcc_generics.h"


namespace mcc
{

enum class MccGenericMountErrorCode : int {
    ERROR_OK,
    ERROR_HW_INIT,
    ERROR_HW_STOP,
    ERROR_HW_GETSTATE,
    ERROR_SET_TARGET,
    ERROR_MOUNT_SLEW,
    ERROR_MOUNT_TRACK
};

enum class MccGenericFsmMountErrorCode : int { ERROR_OK, ERROR_INVALID_OPERATION, ERROR_UNKNOWN_EVENT };

}  // namespace mcc


namespace std
{

template <>
class is_error_code_enum<mcc::MccGenericMountErrorCode> : public true_type
{
};

template <>
class is_error_code_enum<mcc::MccGenericFsmMountErrorCode> : public true_type
{
};

}  // namespace std



namespace mcc
{

// error category
struct MccGenericMountCategory : public std::error_category {
    MccGenericMountCategory() : std::error_category() {}

    const char* name() const noexcept
    {
        return "MCC-GENERIC-MOUNT";
    }

    std::string message(int ec) const
    {
        MccGenericMountErrorCode err = static_cast<MccGenericMountErrorCode>(ec);

        switch (err) {
            case MccGenericMountErrorCode::ERROR_OK:
                return "OK";
            case MccGenericMountErrorCode::ERROR_HW_INIT:
                return "an error occured while initializing mount";
            case MccGenericMountErrorCode::ERROR_HW_STOP:
                return "an error occured while stopping mount";
            case MccGenericMountErrorCode::ERROR_HW_GETSTATE:
                return "cannot get state of hardware";
            default:
                return "UNKNOWN";
        }
    }

    static const MccGenericMountCategory& get()
    {
        static const MccGenericMountCategory constInst;
        return constInst;
    }
};


struct MccGenericFsmMountCategory : public std::error_category {
    MccGenericFsmMountCategory() : std::error_category() {}

    const char* name() const noexcept
    {
        return "MCC-GENERIC-FSM-MOUNT";
    }

    std::string message(int ec) const
    {
        MccGenericFsmMountErrorCode err = static_cast<MccGenericFsmMountErrorCode>(ec);

        switch (err) {
            case MccGenericFsmMountErrorCode::ERROR_OK:
                return "OK";
            case MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION:
                return "requested operation is not allowed";
            case MccGenericFsmMountErrorCode::ERROR_UNKNOWN_EVENT:
                return "unexpected finite-state-machine event";
            default:
                return "UNKNOWN";
        }
    }

    static const MccGenericFsmMountCategory& get()
    {
        static const MccGenericFsmMountCategory constInst;
        return constInst;
    }
};



inline std::error_code make_error_code(MccGenericMountErrorCode ec)
{
    return std::error_code(static_cast<int>(ec), MccGenericMountCategory::get());
}

inline std::error_code make_error_code(MccGenericFsmMountErrorCode ec)
{
    return std::error_code(static_cast<int>(ec), MccGenericFsmMountCategory::get());
}



template <mcc_hardware_c HardwareT,
          mcc_telemetry_c TelemetryT,
          mcc_pzone_container_c PZoneContT,
          mcc_slewing_model_c SlewModelT,
          mcc_tracking_model_c TrackModelT,
          mcc_logger_c LoggerT = MccNullLogger>
class MccGenericMount : public HardwareT,
                        public TelemetryT,
                        public PZoneContT,
                        public SlewModelT,
                        public TrackModelT,
                        public LoggerT
{
public:
    typedef std::error_code error_t;

    using LoggerT::logDebug;
    using LoggerT::logError;
    using LoggerT::logInfo;
    using LoggerT::logWarn;


    using typename SlewModelT::slewing_params_t;
    using typename TrackModelT::tracking_params_t;


    enum class mount_status_t : int { IDLE, INITIALIZATION, STOPPED, SLEWING, ADJUSTING, TRACKING, ERROR };

    static constexpr std::string_view mountStatusStr(mount_status_t status)
    {
        return status == mount_status_t::IDLE   ? "IDLE"
               : mount_status_t::INITIALIZATION ? "INIT"
               : mount_status_t::STOPPED        ? "STOP"
               : mount_status_t::SLEWING        ? "SLEW"
               : mount_status_t::ADJUSTING      ? "ADJST"
               : mount_status_t::TRACKING       ? "TRACK"
               : mount_status_t::ERROR          ? "ERR"
                                                : "UNKNOWN";
    }

    template <typename... HardwareCtorArgTs,
              typename... TelemetryCtorArgTs,
              typename... PZoneContCtorArgTs,
              typename... SlewModelCtorArgTs,
              typename... TrackModelCtorArgTs,
              typename... LoggerCtorArgTs>
    MccGenericMount(std::tuple<HardwareCtorArgTs...> hw_ctor_args,
                    std::tuple<TelemetryCtorArgTs...> tm_ctor_args,
                    std::tuple<PZoneContCtorArgTs...> pzcont_ctor_args,
                    std::tuple<SlewModelCtorArgTs...> smodel_ctor_args,
                    std::tuple<TrackModelCtorArgTs...> tmodel_ctor_args,
                    std::tuple<LoggerCtorArgTs...> log_ctor_args)
        : HardwareT(std::make_from_tuple<HardwareT>(std::move(hw_ctor_args))),
          TelemetryT(std::make_from_tuple<TelemetryT>(std::move(tm_ctor_args))),
          PZoneContT(std::make_from_tuple<PZoneContT>(std::move(pzcont_ctor_args))),
          SlewModelT(std::make_from_tuple<SlewModelT>(std::move(smodel_ctor_args))),
          TrackModelT(std::make_from_tuple<TrackModelT>(std::move(tmodel_ctor_args))),
          LoggerT(std::make_from_tuple<LoggerT>(std::move(log_ctor_args))),
          _mountStatus(new std::atomic<mount_status_t>{})
    {
        *_mountStatus = mount_status_t::IDLE;
    }

    MccGenericMount(MccGenericMount&&) = default;
    MccGenericMount(const MccGenericMount&) = delete;

    MccGenericMount& operator=(MccGenericMount&&) = default;
    MccGenericMount& operator=(const MccGenericMount&) = delete;

    virtual ~MccGenericMount()
    {
        stopMount();
    };

    error_t stopMount()
    {
        logInfo("Stop any movements ...");

        this->stopTracking();
        this->stopSlewing();

        auto hw_err = this->hardwareStop();
        if (hw_err) {
            *_mountStatus = mount_status_t::ERROR;

            return mcc_deduce_error_code(hw_err, MccGenericMountErrorCode::ERROR_HW_STOP);
        }

        logInfo("Stop command was sent");

        *_mountStatus = mount_status_t::STOPPED;

        return MccGenericMountErrorCode::ERROR_OK;
    }

    error_t initMount()
    {
        logInfo("Start generic mount initialization ...");

        *_mountStatus = mount_status_t::INITIALIZATION;

        auto hw_err = this->hardwareInit();
        if (hw_err) {
            *_mountStatus = mount_status_t::ERROR;

            return mcc_deduce_error_code(hw_err, MccGenericMountErrorCode::ERROR_HW_STOP);
        }

        logInfo("Generic mount initialization was performed");

        *_mountStatus = mount_status_t::IDLE;

        return MccGenericMountErrorCode::ERROR_OK;
    }

    // re-implements TelemetryT::setPointingTarget to hold target coordinates
    // in some intermediate buffer
    error_t setPointingTarget(mcc_celestial_point_c auto pt)
    {
        mcc_copy_celestial_point(std::move(pt), &_enteredTargetCoordiniates);

        std::string xstr;
        if (_enteredTargetCoordiniates.pair_kind == MccCoordPairKind::COORDS_KIND_RADEC_ICRS ||
            _enteredTargetCoordiniates.pair_kind == MccCoordPairKind::COORDS_KIND_RADEC_APP ||
            _enteredTargetCoordiniates.pair_kind == MccCoordPairKind::COORDS_KIND_HADEC_APP) {
            xstr = MccAngle(_enteredTargetCoordiniates.X).sexagesimal(true);
        } else {
            xstr = MccAngle(_enteredTargetCoordiniates.X).sexagesimal();
        }

        logInfo(std::format("Set entered target coordinates to: {} {} {}", xstr,
                            MccAngle(_enteredTargetCoordiniates.Y).sexagesimal(),
                            MccCoordPairKindToStr(_enteredTargetCoordiniates.pair_kind)));

        return MccGenericMountErrorCode::ERROR_OK;
    }

    // re-implements SlewModelT::slewToTarget to fetch input target coordinates from intermediate buffer
    error_t slewToTarget(bool slew_and_stop = false)
    {
        auto err = TelemetryT::setPointingTarget(_enteredTargetCoordiniates);
        if (err) {
            *_mountStatus = mount_status_t::ERROR;

            return mcc_deduce_error_code(err, MccGenericMountErrorCode::ERROR_SET_TARGET);
        }

        *_mountStatus = mount_status_t::SLEWING;

        error_t s_err =
            mcc_deduce_error_code(SlewModelT::slewToTarget(slew_and_stop), MccGenericMountErrorCode::ERROR_MOUNT_SLEW);

        if (s_err) {
            *_mountStatus = mount_status_t::ERROR;
            return s_err;
        }

        if (slew_and_stop) {
            *_mountStatus = mount_status_t::IDLE;
        }

        return s_err;
    }

    error_t trackTarget()
    {
        auto err = TrackModelT::trackTarget();
        if (err) {
            *_mountStatus = mount_status_t::ERROR;

            return mcc_deduce_error_code(err, MccGenericMountErrorCode::ERROR_MOUNT_TRACK);
        }

        *_mountStatus = mount_status_t::TRACKING;

        return MccGenericMountErrorCode::ERROR_OK;
    }


    error_t stopSlewing()
    {
        *_mountStatus = mount_status_t::IDLE;

        SlewModelT::stopSlewing();

        return MccGenericMountErrorCode::ERROR_OK;
    }

    error_t stopTracking()
    {
        // *_mountStatus = mount_status_t::IDLE;
        _mountStatus->store(mount_status_t::IDLE);

        TrackModelT::stopTracking();

        return MccGenericMountErrorCode::ERROR_OK;
    }


    MccGenericMount::mount_status_t mountStatus() const
    {
        return *_mountStatus;
    }

protected:
    MccCelestialPoint _enteredTargetCoordiniates{};

    std::unique_ptr<std::atomic<MccGenericMount::mount_status_t>> _mountStatus;
};



/*                          GENERIC FINITE-STATE-MACHINE MOUNT REFERENCE IMPLEMENTATION                          */



template <mcc_generic_mount_c MOUNT_T>
class MccGenericFsmMount : public MOUNT_T, protected fsm::MccFiniteStateMachine
{
public:
    typedef std::error_code error_t;

    using fsm::MccFiniteStateMachine::currentStateID;

    using typename MOUNT_T::slewing_params_t;
    using typename MOUNT_T::tracking_params_t;

protected:
    error_t _lastError;

    /*  default events implementation  */

    struct MccGenericFsmMountBaseEvent {
        virtual ~MccGenericFsmMountBaseEvent() = default;

        MccGenericFsmMount* mount() const
        {
            return _mount;
        }

    protected:
        MccGenericFsmMount* _mount;

        MccGenericFsmMountBaseEvent(MccGenericFsmMount* mount) : _mount(mount) {}
    };


    struct MccGenericFsmMountInitEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-INIT-EVENT"};

        MccGenericFsmMountInitEvent(MccGenericFsmMount* mount) : MccGenericFsmMountBaseEvent(mount) {}
    };

    struct MccGenericFsmMountIdleEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-IDLE-EVENT"};

        MccGenericFsmMountIdleEvent(MccGenericFsmMount* mount) : MccGenericFsmMountBaseEvent(mount) {}
    };

    struct MccGenericFsmMountStopEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-STOP-EVENT"};

        MccGenericFsmMountStopEvent(MccGenericFsmMount* mount) : MccGenericFsmMountBaseEvent(mount) {}
    };

    struct MccGenericFsmMountErrorEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-ERROR-EVENT"};

        MccGenericFsmMountErrorEvent(MccGenericFsmMount* mount, const MccGenericFsmMount::error_t& err)
            : MccGenericFsmMountBaseEvent(mount), _err(err)
        {
        }

        MccGenericFsmMount::error_t eventData() const noexcept
        {
            return _err;
        }

    protected:
        MccGenericFsmMount::error_t _err;
    };

    struct MccGenericFsmMountSlewEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-SLEW-EVENT"};

        MccGenericFsmMountSlewEvent(MccGenericFsmMount* mount, bool slew_and_stop)
            : MccGenericFsmMountBaseEvent(mount), _slewAndStop(slew_and_stop)
        {
        }

        bool eventData() const noexcept
        {
            return _slewAndStop;
        }

    protected:
        bool _slewAndStop{};
    };

    struct MccGenericFsmMountTrackEvent : MccGenericFsmMountBaseEvent {
        static constexpr std::string_view ID{"GENERIC-MOUNT-TRACK-EVENT"};

        MccGenericFsmMountTrackEvent(MccGenericFsmMount* mount) : MccGenericFsmMountBaseEvent(mount) {}
    };


    /*  default states implementation  */

    struct MccGenericFsmMountBaseState {
        virtual ~MccGenericFsmMountBaseState() = default;

    protected:
        MccGenericFsmMountBaseState() = default;

        template <fsm::traits::fsm_event_c EvT>
        void exitLog(this auto&& self, EvT& event)
        {
            using self_t = std::remove_cvref_t<decltype(self)>;

            if constexpr (mcc_generic_log_mount_c<MOUNT_T> && std::derived_from<EvT, MccGenericFsmMountBaseEvent>) {
                event.mount()->logDebug(std::format("Exit from '{}' state due to '{}' event ...", self_t::ID, EvT::ID));
            }
        }

        template <fsm::traits::fsm_event_c EvT>
        void enterLog(this auto&& self, EvT& event)
        {
            using self_t = std::remove_cvref_t<decltype(self)>;

            if constexpr (mcc_generic_log_mount_c<MOUNT_T> && std::derived_from<EvT, MccGenericFsmMountBaseEvent>) {
                event.mount()->logDebug(std::format("Enter to '{}' state due to '{}' event ...", self_t::ID, EvT::ID));
            }
        }
    };

    struct MccGenericFsmMountErrorState;  // default error-state class implementation (forward declaration)

    // template <fsm::traits::fsm_state_c ERROR_STATE_T>
    template <typename ERROR_STATE_T>
    struct MccGenericFsmMountInitState;

    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountStopState;

    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountSlewState;

    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountTrackState;


    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountStartState
        : MccGenericFsmMountBaseState  // initial state after mount-class creation (uninitialized state)
    {
        static constexpr std::string_view ID{"GENERIC-MOUNT-START-STATE"};

        // only initialization is allowed here
        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountInitEvent, MccGenericFsmMountInitState<ERROR_STATE_T>>>;

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);
        }
    };

    // template <fsm::traits::fsm_state_c ERROR_STATE_T>
    template <typename ERROR_STATE_T>
    struct MccGenericFsmMountIdleState
        : MccGenericFsmMountBaseState  // IDLE state: mount is stopped, wait for client commands
    {
        static constexpr std::string_view ID{"GENERIC-MOUNT-IDLE-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountErrorEvent, ERROR_STATE_T>,
            std::pair<MccGenericFsmMountInitEvent, MccGenericFsmMountInitState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountSlewEvent, MccGenericFsmMountSlewState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountTrackEvent, MccGenericFsmMountTrackState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountStopEvent, MccGenericFsmMountStopState<ERROR_STATE_T>>>;

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);
        }
    };

    // template <fsm::traits::fsm_state_c ERROR_STATE_T>
    template <typename ERROR_STATE_T>
    struct MccGenericFsmMountInitState : MccGenericFsmMountBaseState {
        // static_assert(fsm::traits::fsm_state_c<ERROR_STATE_T>);

        static constexpr std::string_view ID{"GENERIC-MOUNT-INIT-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountErrorEvent, ERROR_STATE_T>,
            std::pair<MccGenericFsmMountInitEvent, MccGenericFsmMountInitState>>;


        // void exit(MccGenericFsmMountInitEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn("It seems a re-entering to the initializing state was asked! Ignore the
        //         event!");
        //     }
        // }

        // void enter(MccGenericFsmMountInitEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems a re-entering to the initializing state was asked! Ignore the event and wait for the "
        //             "mount "
        //             "to initialize!");
        //     }
        // }

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);

            event.mount()->logDebug(
                std::format("Current ID: '{}', previous ID: '{}'", ID, event.mount()->previousStateID()));

            if (event.mount()->previousStateID() == ID) {
                event.mount()->logWarn(
                    "It seems a re-entering to the initializing state was asked! Ignore the event and wait for the "
                    "mount "
                    "to initialize!");
                return;
            }

            auto* mount_ptr = event.mount();

            // call base-class initMount method!
            auto err = static_cast<MOUNT_T*>(mount_ptr)->initMount();
            if (err) {
                mount_ptr->dispatchEvent(MccGenericFsmMountErrorEvent{mount_ptr, err});
                return;
            }

            // after initialization switch to IDLE state
            mount_ptr->dispatchEvent(MccGenericFsmMountIdleEvent{mount_ptr});
        }
    };


    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountSlewState : MccGenericFsmMountBaseState {
        static constexpr std::string_view ID{"GENERIC-MOUNT-SLEW-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountStopEvent, MccGenericFsmMountStopState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountErrorEvent, ERROR_STATE_T>,
            std::pair<MccGenericFsmMountTrackEvent, MccGenericFsmMountTrackState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountSlewEvent, MccGenericFsmMountSlewState>>;


        // void exit(MccGenericFsmMountSlewEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems re-entering to slewing state was asked! Do not stop the current slewing process, just "
        //             "ignore this event!");
        //     }
        // }

        // void enter(MccGenericFsmMountSlewEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems re-entering to slewing state was asked! Do not start a new slewing process, just ignore
        //             " "this event!");
        //     }
        // }

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);

            auto* mount_ptr = event.mount();

            if (event.mount()->previousStateID() == ID) {
                event.mount()->logWarn(
                    "It seems re-entering to slewing state was asked! Do not start a new slewing process, just ignore "
                    "this event!");
                return;
            }

            bool slew_and_stop = event.eventData();

            auto nn = std::this_thread::get_id();

            // call base-class slewToTarget method!
            auto err = static_cast<MOUNT_T*>(mount_ptr)->slewToTarget(slew_and_stop);
            if (err) {
                mount_ptr->dispatchEvent(MccGenericFsmMountErrorEvent{mount_ptr, err});
                return;
            }


            if (slew_and_stop) {  // after slewing switch to IDLE state
                mount_ptr->dispatchEvent(MccGenericFsmMountIdleEvent{mount_ptr});
            } else {  // after slewing switch to tracking state
                mount_ptr->dispatchEvent(MccGenericFsmMountTrackEvent{mount_ptr});
            }
        }
    };



    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountTrackState : MccGenericFsmMountBaseState {
        static constexpr std::string_view ID{"GENERIC-MOUNT-TRACK-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountStopEvent, MccGenericFsmMountStopState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountErrorEvent, ERROR_STATE_T>,
            std::pair<MccGenericFsmMountTrackEvent, MccGenericFsmMountTrackState>>;


        // void exit(MccGenericFsmMountTrackEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems re-entering to tracking state was asked! Do not stop the current tracking process, just
        //             " "ignore this event!");
        //     }
        // }

        // void enter(MccGenericFsmMountTrackEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems re-entering to tracking state was asked! Do not start a new tracking process, just "
        //             "ignore this event!");
        //     }
        // }

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);

            auto* mount_ptr = event.mount();

            if (mount_ptr->previousStateID() == ID) {
                mount_ptr->logWarn(
                    "It seems re-entering to tracking state was asked! Do not start a new tracking process, just "
                    "ignore this event!");
                return;
            }

            // call base-class stopMount method!
            auto err = static_cast<MOUNT_T*>(mount_ptr)->trackTarget();
            if (err) {
                mount_ptr->dispatchEvent(MccGenericFsmMountErrorEvent{mount_ptr, err});
                return;
            }

            // after stop tracking switch to IDLE state

            mount_ptr->dispatchEvent(MccGenericFsmMountIdleEvent{mount_ptr});
        }
    };



    template <fsm::traits::fsm_state_c ERROR_STATE_T>
    struct MccGenericFsmMountStopState : MccGenericFsmMountBaseState {
        static constexpr std::string_view ID{"GENERIC-MOUNT-STOP-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<ERROR_STATE_T>>,
            std::pair<MccGenericFsmMountErrorEvent, ERROR_STATE_T>,
            std::pair<MccGenericFsmMountStopEvent, MccGenericFsmMountStopState>>;


        // void exit(MccGenericFsmMountStopEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn("It seems a re-entering to the stop state was asked! Ignore the event!");
        //     }
        // }

        // void enter(MccGenericFsmMountStopEvent& event)
        // {
        //     if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
        //         event.mount()->logWarn(
        //             "It seems a re-entering to the stop state was asked! Ignore the event and wait for the mount to "
        //             "stop!");
        //     }
        // }

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            this->exitLog(event);
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            this->enterLog(event);

            auto* mount_ptr = event.mount();

            if (mount_ptr->previousStateID() == ID) {
                mount_ptr->logWarn(
                    "It seems a re-entering to the stop state was asked! Ignore the event and wait for the mount to "
                    "stop!");
                return;
            }

            // call base-class stopMount method!
            auto err = static_cast<MOUNT_T*>(mount_ptr)->stopMount();
            if (err) {
                mount_ptr->dispatchEvent(MccGenericFsmMountErrorEvent{mount_ptr, err});
                return;
            }

            // after stopping switch to IDLE state
            mount_ptr->dispatchEvent(MccGenericFsmMountIdleEvent{mount_ptr});
        }
    };


    struct MccGenericFsmMountErrorState : MccGenericFsmMountBaseState  // default error-state class implementation
                                                                       // (just log error)
    {
        static constexpr std::string_view ID{"GENERIC-MOUNT-ERROR-STATE"};

        using transition_t = fsm::fsm_transition_table_t<
            std::pair<MccGenericFsmMountErrorEvent, MccGenericFsmMountErrorState>,
            std::pair<MccGenericFsmMountIdleEvent, MccGenericFsmMountIdleState<MccGenericFsmMountErrorState>>,
            std::pair<MccGenericFsmMountInitEvent, MccGenericFsmMountInitState<MccGenericFsmMountErrorState>>>;

        void exit(fsm::traits::fsm_event_c auto& event)
        {
            // just reset error
            event.mount()->_lastError = MccGenericFsmMountErrorCode::ERROR_OK;

            this->exitLog(event);

            if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
                event.mount()->logWarn(
                    std::format("The mount is in the error state!!! One must correct it before transit to any states! "
                                "Event type is '{}'",
                                decltype(event)::ID));
            }
        }

        void enter(fsm::traits::fsm_event_c auto& event)
        {
            event.mount()->_lastError = event.eventData();

            this->enterLog(event);

            if constexpr (mcc_generic_log_mount_c<MOUNT_T>) {
                auto err = event.eventData();
                event.mount()->logError(
                    std::format("The mount is in the error state: code = {}, category = {}, message = '{}'",
                                err.value(), err.category().name(), err.message()));
            }
        }
    };


public:
    template <fsm::traits::fsm_state_c StartStateT, typename... MountCtorArgTs>
    MccGenericFsmMount(StartStateT start_state, MountCtorArgTs&&... mount_ctor_args)
        : MOUNT_T(std::forward<MountCtorArgTs>(mount_ctor_args)...), fsm::MccFiniteStateMachine(std::move(start_state))
    {
    }
    // template <fsm::traits::fsm_state_c ERROR_STATE_T = MccGenericFsmMountErrorState>
    // MccGenericFsmMount(MOUNT_T mount,
    //                    fsm::traits::fsm_state_c auto start_state = MccGenericFsmMountStartState<ERROR_STATE_T>{})
    //     : MOUNT_T(std::move(mount)), fsm::MccFiniteStateMachine(std::move(start_state))
    // {
    // }

    // reimplementation of base-class methods to adapt it to FSM-behavior

    error_t initMount()
    {
        try {
            this->dispatchEvent(MccGenericFsmMountInitEvent{this});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }

    auto stopMount()
    {
        try {
            this->dispatchEvent(MccGenericFsmMountStopEvent{this});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }

    auto slewToTarget(bool slew_and_stop = false)
    {
        try {
            this->dispatchEvent(MccGenericFsmMountSlewEvent{this, slew_and_stop});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }

    auto stopSlewing()
    {
        try {
            this->dispatchEvent(MccGenericFsmMountStopEvent{this});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }

    auto trackTarget()
    {
        try {
            this->dispatchEvent(MccGenericFsmMountTrackEvent{this});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }


    auto stopTracking()
    {
        try {
            this->dispatchEvent(MccGenericFsmMountStopEvent{this});
        } catch (std::system_error const& exc) {
            if (exc.code().category() == fsm::MccFiniteStateMachineCategory::get()) {
                _lastError = MccGenericFsmMountErrorCode::ERROR_INVALID_OPERATION;
            } else {
                // return exc.code();
                _lastError = exc.code();
            }
        }

        // return MccGenericFsmMountErrorCode::ERROR_OK;
        return _lastError;
    }
};


}  // namespace mcc