#pragma once

/**
 * \file Commands.h
 * \brief File containing the definitions of the lockstep commands
 */

#include <td/Types.h>
#include <td/common/NonCopyable.h>
#include <td/protocol/command/CommandData.h>
#include <td/protocol/command/CommandDeclare.h>

namespace td {
namespace protocol {

class CommandVisitor;

/** A Command id is 8 bits wide */
using CommandID = std::uint8_t;

#define DeclareCommand(CommandName, ...) /** CommandName */ CommandName,

/**
 * \enum CommandType
 * \brief Map a Command to an id
 */
enum class CommandType : CommandID {

	DeclareAllCommand()

	/** The number of Commands */
	COMMAND_COUNT
};


#undef DeclareCommand


class Command : private NonCopyable {
  public:
	/**
	 * \return The real type of the Command
	 */
	virtual CommandType GetType() const = 0;

  private:
	/** Use a CommandVisitor to make double-dispatch possible */
	virtual void Accept(CommandVisitor& a_Visitor) const = 0;

	friend class CommandVisitor;
};





namespace commands {

/**
 * \class ConcreteCommand
 * \brief A Command associated with an id and holding data
 * \tparam PT The Command type
 * \tparam Data The structure holding the data of the Command (in td::protocol::data namespace)
 */
template <CommandType CT, typename Data>
class ConcreteCommand : public Command {
  public:
	/** The type of the struct holding the data */
	using CommandDataType = Data;

	/** The structure holding the actual data */
	CommandDataType m_Data;

	/** Construct the Command with data of type CommandDataType */
	ConcreteCommand(const CommandDataType& a_Data = {});

	constexpr CommandType GetType() const override {
		return CT;
	};

  private:
	void Accept(CommandVisitor& a_Visitor) const override;
};





// define TD_INSTANCIATE_COMMANDS
// before including this file
// if you want to instantiate templates
#ifdef TD_INSTANCIATE_COMMANDS
#define DeclareCommand(CommandName, ...)                                                                                              \
	using CommandName = ConcreteCommand<CommandType::CommandName, cdata::CommandName>;                                                \
	template class ConcreteCommand<CommandType::CommandName, cdata::CommandName>;
#else
#define DeclareCommand(CommandName, ...) /** Defines the CommandName Command */                                                       \
	using CommandName = ConcreteCommand<CommandType::CommandName, cdata::CommandName>;
#endif

DeclareAllCommand()

#undef DeclareCommand

}  // namespace commands

}  // namespace protocol
}  // namespace td