/*

Copyright (c) 2007-2014, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef TORRENT_TIME_HPP_INCLUDED
#define TORRENT_TIME_HPP_INCLUDED

#include <boost/version.hpp>
#include "libtorrent/config.hpp"
#include <boost/cstdint.hpp>

#if defined BOOST_ASIO_HAS_STD_CHRONO
#include <chrono>
#else
#include <boost/chrono.hpp>
#endif

#include <string>

// OVERVIEW
// 
// This section contains fundamental time types used internally by
// libtorrent and exposed through various places in the API. The two
// basic types are ``ptime`` and ``time_duration``. The first represents
// a point in time and the second the difference between two points
// in time.
//
// The internal representation of these types is implementation defined
// and they can only be constructed via one of the construction functions
// that take a well defined time unit (seconds, minutes, etc.). They can
// only be turned into well defined time units by the accessor functions
// (total_microseconds(), etc.).
//
// .. note::
// 	In a future version of libtorrent, these types will be replaced
// 	by the standard timer types from ``std::chrono``.
//

namespace libtorrent
{
	TORRENT_EXTRA_EXPORT char const* time_now_string();
	std::string log_time();

#if defined BOOST_ASIO_HAS_STD_CHRONO
	typedef std::chrono::high_resolution_clock clock_type;
#else
	typedef boost::chrono::high_resolution_clock clock_type;
#endif

	typedef clock_type::time_point ptime;
	typedef clock_type::duration time_duration;

	// returns the current time, as represented by ptime. The
	// resolution of this timer is about 100 ms.
	TORRENT_EXPORT ptime const& time_now();

	// returns the current time as represented by ptime. This is
	// more expensive than time_now(), but provides as high resolution
	// as the operating system can provide.
	inline ptime time_now_hires() { return clock_type::now(); }

	// the earliest and latest possible time points
	// representable by ptime.
	inline ptime min_time() { return (clock_type::time_point::min)(); }
	inline ptime max_time() { return (clock_type::time_point::max)(); }

#if defined BOOST_ASIO_HAS_STD_CHRONO
	using std::chrono::seconds;
	using std::chrono::milliseconds;
	using std::chrono::microseconds;
	using std::chrono::minutes;
	using std::chrono::hours;
	using std::chrono::duration_cast;
#else
	using boost::chrono::seconds;
	using boost::chrono::milliseconds;
	using boost::chrono::microseconds;
	using boost::chrono::minutes;
	using boost::chrono::hours;
	using boost::chrono::duration_cast;
#endif

	template<class T>
	boost::int64_t total_seconds(T td)
	{ return duration_cast<seconds>(td).count(); }

	template<class T>
	boost::int64_t total_milliseconds(T td)
	{ return duration_cast<milliseconds>(td).count(); }

	template<class T>
	boost::int64_t total_microseconds(T td)
	{ return duration_cast<microseconds>(td).count(); }

}

#endif // TORRENT_TIME_HPP_INCLUDED