/* The copyright in this software is being made available under the BSD
 * License, included below. This software may be subject to other third party
 * and contributor rights, including patent rights, and no such rights are
 * granted under this license.
 *
 * Copyright (c) 2018, ISO/IEC
 * 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 ISO/IEC 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 HOLDER 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.
 */

#if _WIN32
#define _UNICODE
#include <windows.h>
#endif

#include "PCCChrono.h"
#include "PCCConfig.h"

#if HAVE_GETRUSAGE
#include <sys/resource.h>
#include <sys/time.h>
#endif

//===========================================================================

#if _WIN32
namespace pcc {
namespace chrono {
namespace detail {
using hundredns = std::chrono::duration<int64_t, std::ratio<1, 10000000>>;

// global state to emulate getrusage(RUSAGE_CHILDREN).
hundredns g_cumulative_time_children{0};
}  // namespace detail
}  // namespace chrono
}  // namespace pcc
#endif

//---------------------------------------------------------------------------

#if _WIN32
pcc::chrono::utime_children_clock::time_point pcc::chrono::utime_children_clock::now() noexcept {
  return time_point( detail::g_cumulative_time_children );
}
#endif

//---------------------------------------------------------------------------

#if _WIN32
pcc::chrono::utime_self_clock::time_point pcc::chrono::utime_self_clock::now() noexcept {
  HANDLE   hProcess = GetCurrentProcess();
  FILETIME dummy;
  FILETIME userTime;

  GetProcessTimes( hProcess, &dummy, &dummy, &dummy, &userTime );

  ULARGE_INTEGER val;
  val.LowPart  = userTime.dwLowDateTime;
  val.HighPart = userTime.dwHighDateTime;

  using hundredns = std::chrono::duration<int64_t, std::ratio<1, 10000000>>;
  return time_point( hundredns( val.QuadPart ) );
}
#endif

//---------------------------------------------------------------------------

#if HAVE_GETRUSAGE
pcc::chrono::utime_self_clock::time_point pcc::chrono::utime_self_clock::now() noexcept {
  struct rusage usage;
  getrusage( RUSAGE_SELF, &usage );

  std::chrono::nanoseconds total;
  total = std::chrono::seconds( usage.ru_utime.tv_sec ) + std::chrono::microseconds( usage.ru_utime.tv_usec );

  return time_point( total );
}
#endif

//---------------------------------------------------------------------------

#if HAVE_GETRUSAGE
pcc::chrono::utime_children_clock::time_point pcc::chrono::utime_children_clock::now() noexcept {
  struct rusage usage;
  getrusage( RUSAGE_CHILDREN, &usage );

  std::chrono::nanoseconds total;
  total = std::chrono::seconds( usage.ru_utime.tv_sec ) + std::chrono::microseconds( usage.ru_utime.tv_usec );

  return time_point( total );
}
#endif

//===========================================================================
