/*
  Copyright 2020 Equinor ASA

  This file is part of the Open Porous Media project (OPM).

  OPM is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  OPM is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h> // CMake
#include <cstdlib>
#include <cstring>
#include <opm/common/OpmLog/OpmLog.hpp>
#include <opm/common/ErrorMacros.hpp>

#include <opm/simulators/linalg/bda/WellContributions.hpp>

#ifdef HAVE_OPENCL
#include <opm/simulators/linalg/bda/opencl/openclWellContributions.hpp>
#endif

#ifdef HAVE_CUDA
#include <opm/simulators/linalg/bda/cuda/cuWellContributions.hpp>
#endif

namespace Opm
{

std::unique_ptr<WellContributions>
WellContributions::create(const std::string& accelerator_mode, bool useWellConn)
{
    if(accelerator_mode.compare("cusparse") == 0){
#if HAVE_CUDA
    return std::make_unique<WellContributionsCuda>();
#else
    OPM_THROW(std::runtime_error, "Cannot initialize well contributions: CUDA is not enabled");
#endif
    }
    else if(accelerator_mode.compare("opencl") == 0){
#if HAVE_OPENCL
        return std::make_unique<WellContributionsOCL>();
#else
        OPM_THROW(std::runtime_error, "Cannot initialize well contributions: OpenCL is not enabled");
#endif
    }
    else if(accelerator_mode.compare("fpga") == 0){
        // unused for FPGA, but must be defined to avoid error
        return std::make_unique<WellContributions>();
    }
    else if(accelerator_mode.compare("amgcl") == 0){
        if (!useWellConn) {
            OPM_THROW(std::logic_error, "Error amgcl requires --matrix-add-well-contributions=true");
        }
        return std::make_unique<WellContributions>();
    }
    else{
        OPM_THROW(std::logic_error, "Invalid accelerator mode");
    }
}

void WellContributions::addMatrix([[maybe_unused]] MatrixType type,
                                  [[maybe_unused]] int* colIndices,
                                  [[maybe_unused]] double* values,
                                  [[maybe_unused]] unsigned int val_size)
{
#if !HAVE_CUDA && !HAVE_OPENCL
    OPM_THROW(std::logic_error, "Error cannot add StandardWell matrix on GPU because neither CUDA nor OpenCL were found by cmake");
#endif

    if (!allocated) {
        OPM_THROW(std::logic_error, "Error cannot add wellcontribution before allocating memory in WellContributions");
    }

    this->APIaddMatrix(type, colIndices, values, val_size);

    if(MatrixType::B == type) {
        num_blocks_so_far += val_size;
        num_std_wells_so_far++;
    }
}

void WellContributions::setBlockSize(unsigned int dim_, unsigned int dim_wells_)
{
    dim = dim_;
    dim_wells = dim_wells_;

    if(dim != 3 || dim_wells != 4){
        std::ostringstream oss;
        oss << "WellContributions::setBlockSize error: dim and dim_wells must be equal to 3 and 4, repectivelly, otherwise the add well contributions kernel won't work.\n";
        OPM_THROW(std::logic_error, oss.str());
    }
}

void WellContributions::setVectorSize(unsigned N_) {
    N = N_;
}

void WellContributions::addNumBlocks(unsigned int numBlocks)
{
    if (allocated) {
        OPM_THROW(std::logic_error, "Error cannot add more sizes after allocated in WellContributions");
    }
    num_blocks += numBlocks;
    num_std_wells++;
}

void WellContributions::alloc()
{
    if (num_std_wells > 0) {
        val_pointers.resize(num_std_wells+1);

        this->APIalloc();
        allocated = true;
    }
}

void WellContributions::addMultisegmentWellContribution(unsigned int dim_,
                                                        unsigned int dim_wells_,
                                                        unsigned int Mb,
                                                        std::vector<double>& Bvalues,
                                                        std::vector<unsigned int>& BcolIndices,
                                                        std::vector<unsigned int>& BrowPointers,
                                                        unsigned int DnumBlocks,
                                                        double* Dvalues,
                                                        UMFPackIndex* DcolPointers,
                                                        UMFPackIndex* DrowIndices,
                                                        std::vector<double>& Cvalues)
{
    assert(dim==dim_);
    multisegments.push_back(std::make_unique<MultisegmentWellContribution>(dim_,
                                                                           dim_wells_,
                                                                           Mb,
                                                                           Bvalues,
                                                                           BcolIndices,
                                                                           BrowPointers,
                                                                           DnumBlocks,
                                                                           Dvalues,
                                                                           DcolPointers,
                                                                           DrowIndices,
                                                                           Cvalues));
    ++num_ms_wells;
}

} //namespace Opm
