/*
 * Distributed under the OSI-approved Apache License, Version 2.0.  See
 * accompanying file Copyright.txt for details.
 */
#include <cstdint>
#include <cstring>

#include <iostream>
#include <numeric> //std::iota
#include <stdexcept>

#include <adios2.h>

#include <gtest/gtest.h>

std::string engineName; // comes from command line

void BZIP2Accuracy1D(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWR_BZIP2_1D_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 1000;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx);
    std::vector<double> r64s(Nx);

    // range 0 to 999
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize)};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank)};
        const adios2::Dims count{Nx};

        adios2::Variable<float> var_r32 = io.DefineVariable<float>(
            "r32", shape, start, count, adios2::ConstantDims);
        adios2::Variable<double> var_r64 = io.DefineVariable<double>(
            "r64", shape, start, count, adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);

        const adios2::Dims start{mpiRank * Nx};
        const adios2::Dims count{Nx};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[i]) << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[i]) << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

void BZIP2Accuracy2D(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWRBZIP22D_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 100;
    const size_t Ny = 50;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx * Ny);
    std::vector<double> r64s(Nx * Ny);

    // range 0 to 100*50
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize), Ny};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank), 0};
        const adios2::Dims count{Nx, Ny};

        auto var_r32 = io.DefineVariable<float>("r32", shape, start, count,
                                                adios2::ConstantDims);
        auto var_r64 = io.DefineVariable<double>("r64", shape, start, count,
                                                 adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r32.Shape()[1], Ny);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r64.Shape()[1], Ny);

        const adios2::Dims start{mpiRank * Nx, 0};
        const adios2::Dims count{Nx, Ny};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx * Ny; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[i]) << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[i]) << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

void BZIP2Accuracy3D(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWRBZIP23D_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 10;
    const size_t Ny = 20;
    const size_t Nz = 15;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx * Ny * Nz);
    std::vector<double> r64s(Nx * Ny * Nz);

    // range 0 to 100*50
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize), Ny, Nz};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank), 0, 0};
        const adios2::Dims count{Nx, Ny, Nz};

        auto var_r32 = io.DefineVariable<float>("r32", shape, start, count,
                                                adios2::ConstantDims);
        auto var_r64 = io.DefineVariable<double>("r64", shape, start, count,
                                                 adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r32.Shape()[1], Ny);
        ASSERT_EQ(var_r32.Shape()[2], Nz);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r64.Shape()[1], Ny);
        ASSERT_EQ(var_r64.Shape()[2], Nz);

        const adios2::Dims start{mpiRank * Nx, 0, 0};
        const adios2::Dims count{Nx, Ny, Nz};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx * Ny * Nz; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[i]) << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[i]) << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

void BZIP2Accuracy1DSel(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWRBZIP21DSel_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 1000;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx);
    std::vector<double> r64s(Nx);

    // range 0 to 999
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize)};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank)};
        const adios2::Dims count{Nx};

        auto var_r32 = io.DefineVariable<float>("r32", shape, start, count,
                                                adios2::ConstantDims);
        auto var_r64 = io.DefineVariable<double>("r64", shape, start, count,
                                                 adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);

        const adios2::Dims start{mpiRank * Nx + Nx / 2};
        const adios2::Dims count{Nx / 2};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx / 2; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[Nx / 2 + i]) << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[Nx / 2 + i]) << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

void BZIP2Accuracy2DSel(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWRBZIP22DSel_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 100;
    const size_t Ny = 50;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx * Ny);
    std::vector<double> r64s(Nx * Ny);

    // range 0 to 100*50
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize), Ny};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank), 0};
        const adios2::Dims count{Nx, Ny};

        auto var_r32 = io.DefineVariable<float>("r32", shape, start, count,
                                                adios2::ConstantDims);
        auto var_r64 = io.DefineVariable<double>("r64", shape, start, count,
                                                 adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r32.Shape()[1], Ny);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r64.Shape()[1], Ny);

        const adios2::Dims start{mpiRank * Nx + Nx / 2, 0};
        const adios2::Dims count{Nx / 2, Ny};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx / 2 * Ny; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[Nx / 2 * Ny + i]) << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[Nx / 2 * Ny + i]) << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

void BZIP2Accuracy3DSel(const std::string accuracy)
{
    // Each process would write a 1x8 array and all processes would
    // form a mpiSize * Nx 1D array
    const std::string fname("BPWRBZIP23DSel_" + accuracy + ".bp");

    int mpiRank = 0, mpiSize = 1;
    // Number of rows
    const size_t Nx = 10;
    const size_t Ny = 20;
    const size_t Nz = 15;

    // Number of steps
    const size_t NSteps = 1;

    std::vector<float> r32s(Nx * Ny * Nz);
    std::vector<double> r64s(Nx * Ny * Nz);

    // range 0 to 100*50
    std::iota(r32s.begin(), r32s.end(), 0.f);
    std::iota(r64s.begin(), r64s.end(), 0.);

#if ADIOS2_USE_MPI
    MPI_Comm_rank(MPI_COMM_WORLD, &mpiRank);
    MPI_Comm_size(MPI_COMM_WORLD, &mpiSize);
#endif

#if ADIOS2_USE_MPI
    adios2::ADIOS adios(MPI_COMM_WORLD);
#else
    adios2::ADIOS adios;
#endif
    {
        adios2::IO io = adios.DeclareIO("TestIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        const adios2::Dims shape{static_cast<size_t>(Nx * mpiSize), Ny, Nz};
        const adios2::Dims start{static_cast<size_t>(Nx * mpiRank), 0, 0};
        const adios2::Dims count{Nx, Ny, Nz};

        auto var_r32 = io.DefineVariable<float>("r32", shape, start, count,
                                                adios2::ConstantDims);
        auto var_r64 = io.DefineVariable<double>("r64", shape, start, count,
                                                 adios2::ConstantDims);

        // add operations
        adios2::Operator BZIP2Op =
            adios.DefineOperator("BZIP2Compressor", adios2::ops::LosslessBZIP2);

        var_r32.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});
        var_r64.AddOperation(
            BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, accuracy}});

        adios2::Engine bpWriter = io.Open(fname, adios2::Mode::Write);

        for (size_t step = 0; step < NSteps; ++step)
        {
            bpWriter.BeginStep();
            bpWriter.Put<float>("r32", r32s.data());
            bpWriter.Put<double>("r64", r64s.data());
            bpWriter.EndStep();
        }

        bpWriter.Close();
    }

    {
        adios2::IO io = adios.DeclareIO("ReadIO");

        if (!engineName.empty())
        {
            io.SetEngine(engineName);
        }
        else
        {
            // Create the BP Engine
            io.SetEngine("BPFile");
        }

        adios2::Engine bpReader = io.Open(fname, adios2::Mode::Read);

        auto var_r32 = io.InquireVariable<float>("r32");
        EXPECT_TRUE(var_r32);
        ASSERT_EQ(var_r32.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r32.Steps(), NSteps);
        ASSERT_EQ(var_r32.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r32.Shape()[1], Ny);
        ASSERT_EQ(var_r32.Shape()[2], Nz);

        auto var_r64 = io.InquireVariable<double>("r64");
        EXPECT_TRUE(var_r64);
        ASSERT_EQ(var_r64.ShapeID(), adios2::ShapeID::GlobalArray);
        ASSERT_EQ(var_r64.Steps(), NSteps);
        ASSERT_EQ(var_r64.Shape()[0], mpiSize * Nx);
        ASSERT_EQ(var_r64.Shape()[1], Ny);
        ASSERT_EQ(var_r64.Shape()[2], Nz);

        const adios2::Dims start{mpiRank * Nx + Nx / 2, 0, 0};
        const adios2::Dims count{Nx / 2, Ny, Nz};
        const adios2::Box<adios2::Dims> sel(start, count);
        var_r32.SetSelection(sel);
        var_r64.SetSelection(sel);

        unsigned int t = 0;
        std::vector<float> decompressedR32s;
        std::vector<double> decompressedR64s;

        while (bpReader.BeginStep() == adios2::StepStatus::OK)
        {
            bpReader.Get(var_r32, decompressedR32s);
            bpReader.Get(var_r64, decompressedR64s);
            bpReader.EndStep();

            for (size_t i = 0; i < Nx / 2 * Ny * Nz; ++i)
            {
                std::stringstream ss;
                ss << "t=" << t << " i=" << i << " rank=" << mpiRank;
                std::string msg = ss.str();

                ASSERT_EQ(decompressedR32s[i], r32s[Nx / 2 * Ny * Nz + i])
                    << msg;
                ASSERT_EQ(decompressedR64s[i], r64s[Nx / 2 * Ny * Nz + i])
                    << msg;
            }
            ++t;
        }

        EXPECT_EQ(t, NSteps);

        bpReader.Close();
    }
}

class BPWriteReadBZIP2 : public ::testing::TestWithParam<std::string>
{
public:
    BPWriteReadBZIP2() = default;
    virtual void SetUp(){};
    virtual void TearDown(){};
};

TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP21D)
{
    BZIP2Accuracy1D(GetParam());
}
TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP22D)
{
    BZIP2Accuracy2D(GetParam());
}
TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP23D)
{
    BZIP2Accuracy3D(GetParam());
}
TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP21DSel)
{
    BZIP2Accuracy1DSel(GetParam());
}
TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP22DSel)
{
    BZIP2Accuracy2DSel(GetParam());
}
TEST_P(BPWriteReadBZIP2, ADIOS2BPWriteReadBZIP23DSel)
{
    BZIP2Accuracy3DSel(GetParam());
}

INSTANTIATE_TEST_CASE_P(
    BZIP2Accuracy, BPWriteReadBZIP2,
    ::testing::Values(adios2::ops::bzip2::value::blockSize100k_1,
                      adios2::ops::bzip2::value::blockSize100k_2,
                      adios2::ops::bzip2::value::blockSize100k_3,
                      adios2::ops::bzip2::value::blockSize100k_4,
                      adios2::ops::bzip2::value::blockSize100k_5,
                      adios2::ops::bzip2::value::blockSize100k_6,
                      adios2::ops::bzip2::value::blockSize100k_7,
                      adios2::ops::bzip2::value::blockSize100k_8,
                      adios2::ops::bzip2::value::blockSize100k_9));

int main(int argc, char **argv)
{
#if ADIOS2_USE_MPI
    MPI_Init(nullptr, nullptr);
#endif

    int result;
    ::testing::InitGoogleTest(&argc, argv);

    if (argc > 1)
    {
        engineName = std::string(argv[1]);
    }
    result = RUN_ALL_TESTS();

#if ADIOS2_USE_MPI
    MPI_Finalize();
#endif

    return result;
}
