#pragma once

namespace sp {
namespace option {

// Provide static numeric ID, to facilitate implementation of GetIdImpl()
template <std::intmax_t TId>
struct StaticNumIdImpl {};

// Facilitate implementation of DispatchImpl()
template <typename TActual>
struct DispatchImpl {};

// Provide fields of the message, facilitate implementation of
// ReadImpl(), WriteImpl(), ValidImpl(), etc...
template <typename TFields>
struct FieldsImpl {};

}  // namespace option


namespace details {





template <typename... TOptions>
class MessageImplParsedOptions;

template <>
struct MessageImplParsedOptions<> {
	static const bool HasStaticNumIdImpl = false;
	static const bool HasDispatchImpl = false;
	static const bool HasFieldsImpl = false;
};





template <std::intmax_t TId, typename... TOptions>
struct MessageImplParsedOptions<option::StaticNumIdImpl<TId>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
	static const bool HasStaticNumIdImpl = true;
	static const std::intmax_t MsgId = TId;
};

template <typename TActual, typename... TOptions>
struct MessageImplParsedOptions<option::DispatchImpl<TActual>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
	static const bool HasDispatchImpl = true;
	using ActualMessage = TActual;
};

template <typename TFields, typename... TOptions>
struct MessageImplParsedOptions<option::FieldsImpl<TFields>, TOptions...> : public MessageImplParsedOptions<TOptions...> {
	static const bool HasFieldsImpl = true;
	using Fields = TFields;
};

}  // namespace details
}  // namespace sp