// Copyright (C) 2005, 2006 Douglas Gregor.

// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

// A test of the all_to_all() collective.
#include <boost/mpi/collectives/all_to_all.hpp>
#include <boost/mpi/communicator.hpp>
#include <boost/mpi/environment.hpp>
#include <algorithm>
#include "gps_position.hpp"
#include <boost/serialization/string.hpp>
#include <boost/serialization/list.hpp>
#include <boost/iterator/counting_iterator.hpp>
#include <boost/lexical_cast.hpp>

#include "mpi_test_utils.hpp"

using boost::mpi::communicator;

using boost::mpi::packed_skeleton_iarchive;
using boost::mpi::packed_skeleton_oarchive;

template<typename Generator>
int
all_to_all_test(const communicator& comm, Generator generator,
                const char* kind)
{
  typedef typename Generator::result_type value_type;

  using boost::mpi::all_to_all;
  int failed = 0;

  std::vector<value_type> in_values;
  for (int p = 0; p < comm.size(); ++p)
    in_values.push_back(generator((p + 1) * (comm.rank() + 1)));

  if (comm.rank() == 0) {
    std::cout << "Performing all-to-all operation on " << kind << "...";
    std::cout.flush();
  }
  std::vector<value_type> out_values;
  all_to_all(comm, in_values, out_values);

  for (int p = 0; p < comm.size(); ++p) {
    BOOST_MPI_CHECK(out_values[p] == generator((p + 1) * (comm.rank() + 1)), failed);
  }

  if (comm.rank() == 0) {
    std::cout << " done." << std::endl;
  }

  (comm.barrier)();
  return failed;
}

// Generates integers to test with all_to_all()
struct int_generator
{
  typedef int result_type;

  int operator()(int p) const { return 17 + p; }
};

// Generates GPS positions to test with all_to_all()
struct gps_generator
{
  typedef gps_position result_type;

  gps_position operator()(int p) const
  {
    return gps_position(39 + p, 16, 20.2799);
  }
};

struct string_generator
{
  typedef std::string result_type;

  std::string operator()(int p) const
  {
    std::string result = boost::lexical_cast<std::string>(p);
    result += " rosebud";
    if (p != 1) result += 's';
    return result;
  }
};

struct string_list_generator
{
  typedef std::list<std::string> result_type;

  std::list<std::string> operator()(int p) const
  {
    std::list<std::string> result;
    for (int i = 0; i <= p; ++i) {
      std::string value = boost::lexical_cast<std::string>(i);
      result.push_back(value);
    }
    return result;
  }
};

int main()
{
  boost::mpi::environment env;
  communicator comm;
  int failed = 0;
  BOOST_MPI_COUNT_FAILED(all_to_all_test(comm, int_generator(), "integers"), failed);
  BOOST_MPI_COUNT_FAILED(all_to_all_test(comm, gps_generator(), "GPS positions"), failed);
  BOOST_MPI_COUNT_FAILED(all_to_all_test(comm, string_generator(), "string"), failed);
  BOOST_MPI_COUNT_FAILED(all_to_all_test(comm, string_list_generator(), "list of strings"), failed);
  return failed;
}
