// Ceres Solver - A fast non-linear least squares minimizer

// Copyright 2015 Google Inc. All rights reserved.

// http://ceres-solver.org/

//

// 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 Google Inc. 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

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// POSSIBILITY OF SUCH DAMAGE.

//

// Author: strandmark@google.com (Petter Strandmark)

#include "ceres/wall_time.h"

#ifdef CERES_USE_OPENMP

#include <omp.h>

#else

#include <ctime>

#endif

#ifdef _WIN32

#include <windows.h>

#else

#include <sys/time.h>

#endif

namespace ceres {

namespace internal {

double WallTimeInSeconds() {

#ifdef CERES_USE_OPENMP

  return omp_get_wtime();

#else

#ifdef _WIN32

  return static_cast<double>(std::time(NULL));

#else

  timeval time_val;

  gettimeofday(&time_val, NULL);

  return (time_val.tv_sec + time_val.tv_usec * 1e-6);

#endif

#endif

}

EventLogger::EventLogger(const std::string& logger_name)

    : start_time_(WallTimeInSeconds()),

      last_event_time_(start_time_),

      events_("") {

  StringAppendF(&events_,

                "\n%s\n                                   Delta   Cumulative\n",

                logger_name.c_str());

}

EventLogger::~EventLogger() {

  if (VLOG_IS_ON(3)) {

    AddEvent("Total");

    VLOG(2) << "\n" << events_ << "\n";

  }

}

void EventLogger::AddEvent(const std::string& event_name) {

  if (!VLOG_IS_ON(3)) {

    return;

  }

  const double current_time = WallTimeInSeconds();

  const double relative_time_delta = current_time - last_event_time_;

  const double absolute_time_delta = current_time - start_time_;

  last_event_time_ = current_time;

  StringAppendF(&events_,

                "  %30s : %10.5f   %10.5f\n",

                event_name.c_str(),

                relative_time_delta,

                absolute_time_delta);

}

}  // namespace internal

}  // namespace ceres