#pragma once

#include <algorithm>
#include <memory>
#include <ranges>
#include <system_error>
#include <unordered_map>

#include "adc_device_concepts.h"

namespace adc
{

// error codes
enum class AdcGenericDeviceErrorCode : int { ERROR_OK, ERROR_ATTR_IDENT, ERROR_COMMAND_IDENT, ERROR_UNKNOWN };


}  // namespace adc


namespace std
{
template <>
class is_error_code_enum<adc::AdcGenericDeviceErrorCode> : public true_type
{
};
}  // namespace std



namespace adc
{


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

    const char* name() const noexcept
    {
        return "ADC_GENERIC_DEVICE";
    }

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

        switch (err) {
            case AdcGenericDeviceErrorCode::ERROR_OK:
                return "OK";
            case AdcGenericDeviceErrorCode::ERROR_ATTR_IDENT:
                return "invalid attribute identificator";
            case AdcGenericDeviceErrorCode::ERROR_COMMAND_IDENT:
                return "invalid command identificator";
            default:
                return "UNKNOWN";
        }
    }

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


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



template <typename IdentT, interfaces::adc_device_attr_c AttributeT, interfaces::adc_device_cmd_c CommandT>
class AdcGenericDevice
{
public:
    typedef IdentT ident_t;
    typedef AttributeT attribute_t;
    typedef CommandT command_t;

    using attr_ident_t = typename AttributeT::ident_t;
    using cmd_ident_t = typename CommandT::ident_t;

    /*  CONSTRUCTORS AND DESTRUCTOR  */
    AdcGenericDevice(const IdentT& ident) : _ident(ident) {}

    virtual ~AdcGenericDevice() = default;


    /*  PUBLIC METHODS  */

    IdentT ident() const
    {
        return _ident;
    }

    AdcGenericDevice& operator()(const cmd_ident_t& cmd_ident)
    {
        auto it = _deviceCommands.find(cmd_ident);

        if (it != _deviceCommands.end()) {
            // it->second();
            it->second->operator()();
        } else {
            throw std::system_error(AdcGenericDeviceErrorCode::ERROR_COMMAND_IDENT);
        }

        return *this;
    }


    AttributeT& operator[](const attr_ident_t& attr_ident)
    {
        auto it = _deviceAttributes.find(attr_ident);
        if (it != _deviceAttributes.end()) {
            // return it->second;
            return *(it->second);
        }

        throw std::system_error(AdcGenericDeviceErrorCode::ERROR_ATTR_IDENT);
    }


    AdcGenericDevice& addCommand(CommandT&& cmd)
    {
        // _deviceCommands.insert({cmd.ident(), std::move(cmd)});
        _deviceCommands.insert({cmd.ident(), std::make_unique<CommandT>(std::move(cmd))});

        return *this;
    }


    template <typename... CtorArgTs>
    AdcGenericDevice& addCommand(CtorArgTs&&... ctor_args)
    {
        return addCommand({std::forward<CtorArgTs>(ctor_args)...});
    }

    AdcGenericDevice& delCommand(const cmd_ident_t& cmd_ident)
    {
        _deviceCommands.erase(cmd_ident);

        return *this;
    }


    AdcGenericDevice& addAttribute(AttributeT&& attr)
    {
        // _deviceAttributes.insert({attr.ident(), std::move(attr)});
        _deviceAttributes.insert({attr.ident(), std::make_unique<AttributeT>(std::move(attr))});

        return *this;
    }

    template <typename... CtorArgTs>
    AdcGenericDevice& addAttribute(CtorArgTs&&... ctor_args)
    {
        return addAttribute(AttributeT(std::forward<CtorArgTs>(ctor_args)...));
    }


    AdcGenericDevice& delAttribute(const attr_ident_t& attr_ident)
    {
        _deviceAttributes.erase(attr_ident);

        return *this;
    }


    template <std::ranges::output_range<cmd_ident_t> ResultT>
    AdcGenericDevice& commandIdents(ResultT& idents)
    {
        std::ranges::copy(_deviceCommands | std::views::keys, std::back_inserter(idents));

        return *this;
    }

    template <std::ranges::output_range<attr_ident_t> ResultT>
    AdcGenericDevice& attributeIdents(ResultT& idents)
    {
        std::ranges::copy(_deviceAttributes | std::views::keys, std::back_inserter(idents));

        return *this;
    }

protected:
    IdentT _ident;

    // std::unordered_map<attr_ident_t, AttributeT> _deviceAttributes;
    // std::unordered_map<cmd_ident_t, CommandT> _deviceCommands;
    std::unordered_map<attr_ident_t, std::unique_ptr<AttributeT>> _deviceAttributes;
    std::unordered_map<cmd_ident_t, std::unique_ptr<CommandT>> _deviceCommands;
};

}  // namespace adc