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#ifndef KOKKOS_TEST_EXPERIMENTAL_ERROR_REPORTER_HPP
#define KOKKOS_TEST_EXPERIMENTAL_ERROR_REPORTER_HPP

#include <gtest/gtest.h>
#include <iostream>
#include <Kokkos_Core.hpp>

namespace Test {

// Just save the data in the report.  Informative text goies in the operator<<(..).
template <typename DataType1, typename DataType2, typename DataType3>
struct ThreeValReport
{
  DataType1 m_data1;
  DataType2 m_data2;
  DataType3 m_data3;

};

template <typename DataType1, typename DataType2, typename DataType3>
std::ostream &operator<<(std::ostream & os, const ThreeValReport<DataType1, DataType2, DataType3> &val)
{
  return os << "{" << val.m_data1 << " " << val.m_data2 << " " << val.m_data3 << "}";
}

template<typename ReportType>
void checkReportersAndReportsAgree(const std::vector<int> &reporters,
                                   const std::vector<ReportType> &reports)
{
  for (size_t i = 0; i < reports.size(); ++i) {
    EXPECT_EQ(1, reporters[i] % 2);
    EXPECT_EQ(reporters[i], reports[i].m_data1);
  }
}


template <typename DeviceType>
struct ErrorReporterDriverBase {

  typedef ThreeValReport<int, int, double>                                      report_type;
  typedef Kokkos::Experimental::ErrorReporter<report_type, DeviceType>  error_reporter_type;
  error_reporter_type m_errorReporter;

  ErrorReporterDriverBase(int reporter_capacity, int test_size)
    : m_errorReporter(reporter_capacity)  {  }

  KOKKOS_INLINE_FUNCTION bool error_condition(const int work_idx) const { return (work_idx % 2 != 0); }

  void check_expectations(int reporter_capacity, int test_size)
  {
    int num_reported = m_errorReporter.getNumReports();
    int num_attempts = m_errorReporter.getNumReportAttempts();

    int expected_num_reports = std::min(reporter_capacity, test_size / 2);
    EXPECT_EQ(expected_num_reports, num_reported);
    EXPECT_EQ(test_size / 2, num_attempts);

    bool expect_full = (reporter_capacity <= (test_size / 2));
    bool reported_full = m_errorReporter.full();
    EXPECT_EQ(expect_full, reported_full);
  }
};

template <typename ErrorReporterDriverType>
void TestErrorReporter()
{
  typedef ErrorReporterDriverType tester_type;
  std::vector<int> reporters;
  std::vector<typename tester_type::report_type> reports;

  tester_type test1(100, 10);
  test1.m_errorReporter.getReports(reporters, reports);
  checkReportersAndReportsAgree(reporters, reports);

  tester_type test2(10, 100);
  test2.m_errorReporter.getReports(reporters, reports);
  checkReportersAndReportsAgree(reporters, reports);

  typename Kokkos::View<int*, typename ErrorReporterDriverType::execution_space >::HostMirror view_reporters;
  typename Kokkos::View<typename tester_type::report_type*, typename ErrorReporterDriverType::execution_space >::HostMirror
     view_reports;
  test2.m_errorReporter.getReports(view_reporters, view_reports);

  int num_reports = view_reporters.extent(0);
  reporters.clear();
  reports.clear();
  reporters.reserve(num_reports);
  reports.reserve(num_reports);

  for (int i = 0; i < num_reports; ++i) {
    reporters.push_back(view_reporters(i));
    reports.push_back(view_reports(i));
  }
  checkReportersAndReportsAgree(reporters, reports);

}


template <typename DeviceType>
struct ErrorReporterDriver : public ErrorReporterDriverBase<DeviceType>
{
  typedef ErrorReporterDriverBase<DeviceType>                             driver_base;
  typedef typename driver_base::error_reporter_type::execution_space  execution_space;

  ErrorReporterDriver(int reporter_capacity, int test_size)
    : driver_base(reporter_capacity, test_size)
  {
    execute(reporter_capacity, test_size);

    // Test that clear() and resize() work across memory spaces.
    if (reporter_capacity < test_size) {
      driver_base::m_errorReporter.clear();
      driver_base::m_errorReporter.resize(test_size);
      execute(test_size, test_size);
    }
  }

  void execute(int reporter_capacity, int test_size)
  {
    Kokkos::parallel_for(Kokkos::RangePolicy<execution_space>(0,test_size), *this);
    driver_base::check_expectations(reporter_capacity, test_size);
  }

  KOKKOS_INLINE_FUNCTION
  void operator()(const int work_idx) const
  {
    if (driver_base::error_condition(work_idx)) {
      double val = M_PI * static_cast<double>(work_idx);
      typename driver_base::report_type report = {work_idx, -2*work_idx, val};
      driver_base::m_errorReporter.add_report(work_idx, report);
    }
  }
};

#if defined(KOKKOS_CLASS_LAMBDA)
template <typename DeviceType>
struct ErrorReporterDriverUseLambda : public ErrorReporterDriverBase<DeviceType>
{

  typedef ErrorReporterDriverBase<DeviceType>                             driver_base;
  typedef typename driver_base::error_reporter_type::execution_space  execution_space;

  ErrorReporterDriverUseLambda(int reporter_capacity, int test_size)
    : driver_base(reporter_capacity, test_size)
  {
    Kokkos::parallel_for(Kokkos::RangePolicy<execution_space>(0,test_size), KOKKOS_CLASS_LAMBDA (const int work_idx) {
      if (driver_base::error_condition(work_idx)) {
        double val = M_PI * static_cast<double>(work_idx);
        typename driver_base::report_type report = {work_idx, -2*work_idx, val};
        driver_base::m_errorReporter.add_report(work_idx, report);
      }
    });
    driver_base::check_expectations(reporter_capacity, test_size);
  }

};
#endif


#ifdef KOKKOS_ENABLE_OPENMP
struct ErrorReporterDriverNativeOpenMP : public ErrorReporterDriverBase<Kokkos::OpenMP>
{
  typedef ErrorReporterDriverBase<Kokkos::OpenMP>  driver_base;
  typedef typename driver_base::error_reporter_type::execution_space  execution_space;

  ErrorReporterDriverNativeOpenMP(int reporter_capacity, int test_size)
    : driver_base(reporter_capacity, test_size)
  {
#pragma omp parallel for
    for(int work_idx = 0; work_idx < test_size; ++work_idx)
    {
      if (driver_base::error_condition(work_idx)) {
        double val = M_PI * static_cast<double>(work_idx);
        typename driver_base::report_type report = {work_idx, -2*work_idx, val};
        driver_base::m_errorReporter.add_report(work_idx, report);
      }
    };
    driver_base::check_expectations(reporter_capacity, test_size);
  }
};
#endif

} // namespace Test
#endif // #ifndef KOKKOS_TEST_ERROR_REPORTING_HPP

