// This class implements the RP5C01 chip (RTC)

//

// * For technical details on RP5C01 see

//     http://w3.qahwah.net/joost/openMSX/RP5C01.pdf

#ifndef RP5C01_HH

#define RP5C01_HH

#include "Clock.hh"

#include "EnumSetting.hh"

#include <cstdint>

#include <string>

namespace openmsx {

using uint4_t = uint8_t;

class CommandController;

class SRAM;

class RP5C01

{

public:

	enum class RTCMode : uint8_t { EMUTIME, REALTIME };

	RP5C01(CommandController& commandController, SRAM& regs,

	       EmuTime time, const std::string& name);

	void reset(EmuTime time);

	[[nodiscard]] uint4_t readPort(uint4_t port, EmuTime time);

	[[nodiscard]] uint4_t peekPort(uint4_t port) const;

	void writePort(uint4_t port, uint4_t value, EmuTime time);

	template<typename Archive>

	void serialize(Archive& ar, unsigned version);

private:

	void initializeTime();

	void updateTimeRegs(EmuTime time);

	void regs2Time();

	void time2Regs();

	void resetAlarm();

private:

	static constexpr unsigned FREQ = 16384;

	SRAM& regs;

	EnumSetting<RTCMode> modeSetting;

	Clock<FREQ> reference;

	unsigned fraction;

	unsigned seconds, minutes, hours;

	unsigned dayWeek, years, leapYear;

	int days, months; // these two can be -1

	uint4_t modeReg, testReg, resetReg;

};

} // namespace openmsx

#endif