//-----------------------------------------------------------------------------
//
//	TimeStampImpl.cpp
//
//	OSX implementation of a TimeStamp
//
//	Copyright (c) 2010 Mal Lansell <mal@lansell.org>
//	All rights reserved.
//
//	SOFTWARE NOTICE AND LICENSE
//
//	This file is part of OpenZWave.
//
//	OpenZWave is free software: you can redistribute it and/or modify
//	it under the terms of the GNU Lesser General Public License as published
//	by the Free Software Foundation, either version 3 of the License,
//	or (at your option) any later version.
//
//	OpenZWave is distributed in the hope that it will be useful,
//	but WITHOUT ANY WARRANTY; without even the implied warranty of
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//	GNU Lesser General Public License for more details.
//
//	You should have received a copy of the GNU Lesser General Public License
//	along with OpenZWave.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
#include <string>
#include <cstring>
#include "Defs.h"
#include "TimeStampImpl.h"

namespace OpenZWave
{
	namespace Internal
	{
		namespace Platform
		{

//-----------------------------------------------------------------------------
//	<TimeStampImpl::TimeStampImpl>
//	Constructor
//-----------------------------------------------------------------------------
			TimeStampImpl::TimeStampImpl()
			{
				SetTime(0);
			}

//-----------------------------------------------------------------------------
//	<TimeStampImpl::~TimeStampImpl>
//	Destructor
//-----------------------------------------------------------------------------
			TimeStampImpl::~TimeStampImpl()
			{
			}

//-----------------------------------------------------------------------------
//	<TimeStampImpl::SetTime>
//	Sets the timestamp to now, plus an offset in milliseconds
//-----------------------------------------------------------------------------
			void TimeStampImpl::SetTime(int32 _milliseconds	// = 0
					)
			{
				struct timeval now;
				gettimeofday(&now, NULL);

				m_stamp.tv_sec = now.tv_sec + (_milliseconds / 1000);

				// Now add the remainder of our timeout to the microseconds part of 'now'
				now.tv_usec += ((_milliseconds % 1000) * 1000);

				// Careful now! Did it wrap?
				if (now.tv_usec >= 1000000)
				{
					// Yes it did so bump our seconds and modulo
					now.tv_usec %= 1000000;
					m_stamp.tv_sec++;
				}

				m_stamp.tv_nsec = now.tv_usec * 1000;
			}

//-----------------------------------------------------------------------------
//	<TimeStampImpl::TimeRemaining>
//	Gets the difference between now and the timestamp time in milliseconds
//-----------------------------------------------------------------------------
			int32 TimeStampImpl::TimeRemaining()
			{
				int32 diff;

				struct timeval now;
				gettimeofday(&now, NULL);

				// Seconds
				diff = (int32) ((m_stamp.tv_sec - now.tv_sec) * 1000);

				// Milliseconds
				diff += (((m_stamp.tv_nsec / 1000) - now.tv_usec) / 1000);

				return diff;
			}

//-----------------------------------------------------------------------------
//	<TimeStampImpl::GetAsString>
//	Return a string representation
//-----------------------------------------------------------------------------
			std::string TimeStampImpl::GetAsString()
			{
				char str[100];
				// use threadsafe verion of localtime. Reported by nihilus, 2019-04
				// https://www.gnu.org/software/libc/manual/html_node/Broken_002ddown-Time.html#Broken_002ddown-Time
				struct tm *tm, xtm;
				memset(&xtm, 0, sizeof(xtm));
				tm = localtime_r(&m_stamp.tv_sec, &xtm);

				snprintf(str, sizeof(str), "%04d-%02d-%02d %02d:%02d:%02d:%03d ", tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, (int) (m_stamp.tv_nsec / (1000 * 1000)));
				return str;
			}

//-----------------------------------------------------------------------------
//	<TimeStampImpl::operator->
//	Overload the subtract operator to get the difference between two 
//	timestamps in milliseconds
//-----------------------------------------------------------------------------
			int32 TimeStampImpl::operator-(TimeStampImpl const& _other)
			{
				// Seconds
				int32 diff = (int32) ((m_stamp.tv_sec - _other.m_stamp.tv_sec) * 1000);

				// Milliseconds
				diff += ((m_stamp.tv_nsec - _other.m_stamp.tv_nsec) / 1000000);

				return diff;
			}
		} // namespace Platform
	} // namespace Internal
} // namespace OpenZWave