// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "benchmark/reporter.h"
#include "walltime.h"

#include <cstdlib>

#include <iostream>
#include <vector>
#include <tuple>

#include "check.h"
#include "stat.h"

namespace benchmark {

BenchmarkReporter::BenchmarkReporter()
    : output_stream_(&std::cout), error_stream_(&std::cerr)
{
}

BenchmarkReporter::~BenchmarkReporter() {
}

void BenchmarkReporter::PrintBasicContext(std::ostream *out_ptr,
                                          Context const &context) {
  CHECK(out_ptr) << "cannot be null";
  auto& Out = *out_ptr;

  Out << "Run on (" << context.num_cpus << " X " << context.mhz_per_cpu
            << " MHz CPU " << ((context.num_cpus > 1) ? "s" : "") << ")\n";

  Out << LocalDateTimeString() << "\n";

  if (context.cpu_scaling_enabled) {
    Out << "***WARNING*** CPU scaling is enabled, the benchmark "
                 "real time measurements may be noisy and will incur extra "
                 "overhead.\n";
  }

#ifndef NDEBUG
  Out << "***WARNING*** Library was built as DEBUG. Timings may be "
               "affected.\n";
#endif
}

double BenchmarkReporter::Run::GetAdjustedRealTime() const {
  double new_time = real_accumulated_time * GetTimeUnitMultiplier(time_unit);
  if (iterations != 0)
    new_time /= static_cast<double>(iterations);
  return new_time;
}

double BenchmarkReporter::Run::GetAdjustedCPUTime() const {
  double new_time = cpu_accumulated_time * GetTimeUnitMultiplier(time_unit);
  if (iterations != 0)
    new_time /= static_cast<double>(iterations);
  return new_time;
}


} // end namespace benchmark