//---------------------------------------------------------------------------
// NEOPOP : Emulator as in Dreamland
//
// Copyright (c) 2001-2002 by neopop_uk
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 2 of the License, or
//      (at your option) any later version. See also the license.txt file for
//      additional informations.
//---------------------------------------------------------------------------

#include "neopop.h"
#include <ctime>

namespace MDFN_IEN_NGP
{

extern time_t frontend_time;

static uint8 rtc_latch[7];

static void update_rtc_latch(void)
{
	uint8 low, high;

	//Get the system time
	const struct tm* localTime = gmtime(&frontend_time);

	low = localTime->tm_year - 100;
	high = low; //Years
	rtc_latch[0x00] = ((high / 10) << 4) | (low % 10);

	low = localTime->tm_mon + 1;
	high = low; //Months
	rtc_latch[0x01] = ((high / 10) << 4) | (low % 10);

	low = localTime->tm_mday;
	high = low; //Days
	rtc_latch[0x02] = ((high / 10) << 4) | (low % 10);

	low = localTime->tm_hour;
	high = low; //Hours
	rtc_latch[0x03] = ((high / 10) << 4) | (low % 10);

	low = localTime->tm_min;
	high = low; //Minutes
	rtc_latch[0x04] = ((high / 10) << 4) | (low % 10);

	low = localTime->tm_sec;
	high = low; //Seconds
	rtc_latch[0x05] = ((high / 10) << 4) | (low % 10);

	rtc_latch[0x06] = ((rtc_latch[0x00] % 4) << 4) | (localTime->tm_wday & 0x0F);
}

uint8 rtc_read8(uint32 address)
{
	if (address >= 0x0091 && address <= 0x0097)
	{
		if (address == 0x0091)
			update_rtc_latch();

		return (rtc_latch[address - 0x0091]);
	}
	return (0);
}
}