/*
 * SPDX-FileCopyrightText: 2026 Oak Ridge National Laboratory and Contributors
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <ios>       //std::ios_base::failure
#include <iostream>  //std::cout
#include <stdexcept> //std::invalid_argument std::exception
#include <vector>

#include <adios2.h>
#if ADIOS2_USE_MPI
#include <mpi.h>
#endif

int main(int argc, char *argv[])
{
    int rank, size;

#if ADIOS2_USE_MPI
    int provided;

    // MPI_THREAD_MULTIPLE is only required if you enable the SST MPI_DP
    MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPI_Comm_size(MPI_COMM_WORLD, &size);
#else
    rank = 0;
    size = 1;
#endif

    /** Application variable */
    std::vector<float> myFloats = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    std::vector<int> myInts = {0, -1, -2, -3, -4, -5, -6, -7, -8, -9};
    const std::size_t Nx = myFloats.size();

    try
    {
        /** ADIOS class factory of IO class objects */
#if ADIOS2_USE_MPI
        adios2::ADIOS adios(MPI_COMM_WORLD);
#else
        adios2::ADIOS adios;
#endif

        /*** IO class object: settings and factory of Settings: Variables,
         * Parameters, Transports, and Execution: Engines */
        adios2::IO bpIO = adios.DeclareIO("BPFile_N2N");
        bpIO.SetParameters({{"Threads", "2"}});

        /** global array : name, { shape (total) }, { start (local) }, {
         * count
         * (local) }, all are constant dimensions */
        adios2::Variable<float> bpFloats = bpIO.DefineVariable<float>(
            "bpFloats", {size * Nx}, {rank * Nx}, {Nx}, adios2::ConstantDims);

        adios2::Variable<int> bpInts = bpIO.DefineVariable<int>("bpInts", {size * Nx}, {rank * Nx},
                                                                {Nx}, adios2::ConstantDims);

        /** Engine derived class, spawned to start IO operations */
        adios2::Engine bpFileWriter = bpIO.Open("myVectorDeferred.bp", adios2::Mode::Write);

        bpFileWriter.BeginStep();
        /** Put variables for buffering, template type is optional */
        bpFileWriter.Put<float>(bpFloats, myFloats.data());
        bpFileWriter.Put(bpInts, myInts.data());
        bpFileWriter.EndStep();

        /** Create bp file, engine becomes unreachable after this*/
        bpFileWriter.Close();
    }
    catch (std::invalid_argument &e)
    {
        std::cerr << "Invalid argument exception: " << e.what() << "\n";
#if ADIOS2_USE_MPI
        std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
        MPI_Abort(MPI_COMM_WORLD, 1);
#endif
    }
    catch (std::ios_base::failure &e)
    {
        std::cerr << "IO System base failure exception: " << e.what() << "\n";
#if ADIOS2_USE_MPI
        std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
        MPI_Abort(MPI_COMM_WORLD, 1);
#endif
    }
    catch (std::exception &e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
#if ADIOS2_USE_MPI
        std::cerr << "STOPPING PROGRAM from rank " << rank << "\n";
        MPI_Abort(MPI_COMM_WORLD, 1);
#endif
    }

#if ADIOS2_USE_MPI
    MPI_Finalize();
#endif

    return 0;
}
