/*
  Copyright 2013--2018 James E. McClure, Virginia Polytechnic & State University

  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/>.
*/
/*
  Copyright 2013--2018 James E. McClure, Virginia Polytechnic & State University

  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/>.
*/
#ifndef SILO_INTERFACE_HPP
#define SILO_INTERFACE_HPP

#include "IO/silo.h"
#include "common/MPI.h"
#include "common/Utilities.h"

#include "ProfilerApp.h"


#ifdef USE_SILO

#include <silo.h>


namespace IO {
namespace silo {


/****************************************************
 * Helper functions                                  *
 ****************************************************/
template<class TYPE>
static constexpr int getType();
template<>
constexpr int getType<double>()
{
    return DB_DOUBLE;
}
template<>
constexpr int getType<float>()
{
    return DB_FLOAT;
}
template<>
constexpr int getType<int>()
{
    return DB_INT;
}
template<class TYPE>
inline void copyData( Array<TYPE> &data, int type, const void *src )
{
    if ( type == getType<TYPE>() )
        memcpy( data.data(), src, data.length() * sizeof( TYPE ) );
    else if ( type == DB_DOUBLE )
        data.copy( static_cast<const double *>( src ) );
    else if ( type == DB_FLOAT )
        data.copy( static_cast<const float *>( src ) );
    else if ( type == DB_INT )
        data.copy( static_cast<const int *>( src ) );
    else
        ERROR( "Unknown type" );
}


/****************************************************
 * Write/read an arbitrary vector                    *
 ****************************************************/
template<class TYPE>
constexpr int getSiloType();
template<>
constexpr int getSiloType<int>()
{
    return DB_INT;
}
template<>
constexpr int getSiloType<float>()
{
    return DB_FLOAT;
}
template<>
constexpr int getSiloType<double>()
{
    return DB_DOUBLE;
}
template<class TYPE>
void write( DBfile *fid, const std::string &varname, const std::vector<TYPE> &data )
{
    int dims = data.size();
    int err  = DBWrite( fid, varname.c_str(), (void *) data.data(), &dims, 1, getSiloType<TYPE>() );
    ASSERT( err == 0 );
}
template<class TYPE>
std::vector<TYPE> read( DBfile *fid, const std::string &varname )
{
    int N = DBGetVarLength( fid, varname.c_str() );
    std::vector<TYPE> data( N );
    int err = DBReadVar( fid, varname.c_str(), data.data() );
    ASSERT( err == 0 );
    return data;
}


/****************************************************
 * Helper function to get variable suffixes          *
 ****************************************************/
inline std::vector<std::string> getVarSuffix( int ndim, int nvars )
{
    std::vector<std::string> suffix( nvars );
    if ( nvars == 1 ) {
        suffix[0] = "";
    } else if ( nvars == ndim ) {
        if ( ndim == 2 ) {
            suffix[0] = "_x";
            suffix[1] = "_y";
        } else if ( ndim == 3 ) {
            suffix[0] = "_x";
            suffix[1] = "_y";
            suffix[2] = "_z";
        } else {
            ERROR( "Not finished" );
        }
    } else if ( nvars == ndim * ndim ) {
        if ( ndim == 2 ) {
            suffix[0] = "_xx";
            suffix[1] = "_xy";
            suffix[2] = "_yx";
            suffix[3] = "_yy";
        } else if ( ndim == 3 ) {
            suffix[0] = "_xx";
            suffix[1] = "_xy";
            suffix[2] = "_xz";
            suffix[3] = "_yx";
            suffix[4] = "_yy";
            suffix[5] = "_yz";
            suffix[6] = "_zx";
            suffix[7] = "_zy";
            suffix[8] = "_zz";
        } else {
            ERROR( "Not finished" );
        }
    } else {
        for ( int i = 0; i < nvars; i++ )
            suffix[i] = "_" + std::to_string( i + 1 );
    }
    return suffix;
}


/****************************************************
 * Write/read a uniform mesh to silo                 *
 ****************************************************/
template<int NDIM>
void writeUniformMesh( DBfile *fid, const std::string &meshname,
    const std::array<double, 2 * NDIM> &range, const std::array<int, NDIM> &N )
{
    PROFILE_START( "writeUniformMesh", 2 );
    int dims[NDIM];
    for ( size_t d = 0; d < N.size(); d++ )
        dims[d] = N[d] + 1;
    float *x = nullptr;
    if ( NDIM >= 1 ) {
        x = new float[dims[0]];
        for ( int i = 0; i < N[0]; i++ )
            x[i] = range[0] + i * ( range[1] - range[0] ) / N[0];
        x[N[0]] = range[1];
    }
    float *y = nullptr;
    if ( NDIM >= 2 ) {
        y = new float[dims[1]];
        for ( int i = 0; i < N[1]; i++ )
            y[i] = range[2] + i * ( range[3] - range[2] ) / N[1];
        y[N[1]] = range[3];
    }
    float *z = nullptr;
    if ( NDIM >= 3 ) {
        z = new float[dims[2]];
        for ( int i = 0; i < N[2]; i++ )
            z[i] = range[4] + i * ( range[5] - range[4] ) / N[2];
        z[N[2]] = range[5];
    }
    float *coords[] = { x, y, z };
    int err         = DBPutQuadmesh(
        fid, meshname.c_str(), nullptr, coords, dims, NDIM, DB_FLOAT, DB_COLLINEAR, nullptr );
    delete[] x;
    delete[] y;
    delete[] z;
    ASSERT( err == 0 );
    PROFILE_STOP( "writeUniformMesh", 2 );
}


/****************************************************
 * Write a vector/tensor quad variable               *
 ****************************************************/
template<int NDIM, class TYPE>
void writeUniformMeshVariable( DBfile *fid, const std::string &meshname,
    const std::array<int, NDIM> &N, const std::string &varname, const Array<TYPE> &data,
    VariableType type )
{
    PROFILE_START( "writeUniformMeshVariable", 2 );
    int nvars = 1, dims[NDIM] = { 1 };
    const TYPE *vars[NDIM] = { nullptr };
    int vartype            = 0;
    if ( type == VariableType::NodeVariable ) {
        ASSERT( data.ndim() == NDIM || data.ndim() == NDIM + 1 );
        for ( int d = 0; d < NDIM; d++ )
            ASSERT( N[d] + 1 == (int) data.size( d ) );
        vartype  = DB_NODECENT;
        nvars    = data.size( NDIM );
        size_t N = data.length() / nvars;
        for ( int d = 0; d < NDIM; d++ )
            dims[d] = data.size( d );
        for ( int i = 0; i < nvars; i++ )
            vars[i] = &data( i * N );
    } else if ( type == VariableType::EdgeVariable ) {
        ERROR( "Not finished" );
    } else if ( type == VariableType::SurfaceVariable ) {
        ERROR( "Not finished" );
    } else if ( type == VariableType::VolumeVariable ) {
        ASSERT( data.ndim() == NDIM || data.ndim() == NDIM + 1 );
        for ( int d = 0; d < NDIM; d++ )
            ASSERT( N[d] == (int) data.size( d ) );
        vartype  = DB_ZONECENT;
        nvars    = data.size( NDIM );
        size_t N = data.length() / nvars;
        for ( int d = 0; d < NDIM; d++ )
            dims[d] = data.size( d );
        for ( int i = 0; i < nvars; i++ )
            vars[i] = &data( i * N );
    } else {
        ERROR( "Invalid variable type" );
    }
    auto suffix = getVarSuffix( NDIM, nvars );
    std::vector<std::string> var_names( nvars );
    for ( int i = 0; i < nvars; i++ )
        var_names[i] = varname + suffix[i];
    std::vector<char *> varnames( nvars, nullptr );
    for ( int i = 0; i < nvars; i++ )
        varnames[i] = const_cast<char *>( var_names[i].c_str() );
    int err = DBPutQuadvar( fid, varname.c_str(), meshname.c_str(), nvars, varnames.data(), vars,
        dims, NDIM, nullptr, 0, getType<TYPE>(), vartype, nullptr );
    ASSERT( err == 0 );
    PROFILE_STOP( "writeUniformMeshVariable", 2 );
}
template<class TYPE>
Array<TYPE> readUniformMeshVariable( DBfile *fid, const std::string &varname )
{
    auto var = DBGetQuadvar( fid, varname.c_str() );
    ASSERT( var != nullptr );
    Array<TYPE> data( var->nels, var->nvals );
    int type = var->datatype;
    for ( int i = 0; i < var->nvals; i++ ) {
        Array<TYPE> data2( var->nels );
        copyData<TYPE>( data2, type, var->vals[i] );
        memcpy( &data( 0, i ), data2.data(), var->nels * sizeof( TYPE ) );
    }
    std::vector<size_t> dims( var->ndims + 1, var->nvals );
    for ( int d = 0; d < var->ndims; d++ )
        dims[d] = var->dims[d];
    data.reshape( dims );
    DBFreeQuadvar( var );
    return data;
}


/****************************************************
 * Read/write a point mesh/variable to silo          *
 ****************************************************/
template<class TYPE>
void writePointMesh(
    DBfile *fid, const std::string &meshname, int ndim, int N, const TYPE *coords[] )
{
    int err = DBPutPointmesh( fid, meshname.c_str(), ndim, coords, N, getType<TYPE>(), nullptr );
    ASSERT( err == 0 );
}
template<class TYPE>
Array<TYPE> readPointMesh( DBfile *fid, const std::string &meshname )
{
    auto mesh = DBGetPointmesh( fid, meshname.c_str() );
    int N     = mesh->nels;
    int ndim  = mesh->ndims;
    Array<TYPE> coords( N, ndim );
    int type = mesh->datatype;
    for ( int d = 0; d < ndim; d++ ) {
        Array<TYPE> data2( N );
        copyData<TYPE>( data2, type, mesh->coords[d] );
        memcpy( &coords( 0, d ), data2.data(), N * sizeof( TYPE ) );
    }
    DBFreePointmesh( mesh );
    return coords;
}
template<class TYPE>
void writePointMeshVariable(
    DBfile *fid, const std::string &meshname, const std::string &varname, const Array<TYPE> &data )
{
    int N     = data.size( 0 );
    int nvars = data.size( 1 );
    std::vector<const TYPE *> vars( nvars );
    for ( int i = 0; i < nvars; i++ )
        vars[i] = &data( 0, i );
    int err = DBPutPointvar(
        fid, varname.c_str(), meshname.c_str(), nvars, vars.data(), N, getType<TYPE>(), nullptr );
    ASSERT( err == 0 );
}
template<class TYPE>
Array<TYPE> readPointMeshVariable( DBfile *fid, const std::string &varname )
{
    auto var = DBGetPointvar( fid, varname.c_str() );
    ASSERT( var != nullptr );
    Array<TYPE> data( var->nels, var->nvals );
    int type = var->datatype;
    for ( int i = 0; i < var->nvals; i++ ) {
        Array<TYPE> data2( var->nels );
        copyData<TYPE>( data2, type, var->vals[i] );
        memcpy( &data( 0, i ), data2.data(), var->nels * sizeof( TYPE ) );
    }
    DBFreeMeshvar( var );
    return data;
}


/****************************************************
 * Read/write a triangle mesh                        *
 ****************************************************/
template<class TYPE>
void writeTriMesh( DBfile *fid, const std::string &meshName, int ndim, int ndim_tri, int N,
    const TYPE *coords[], int N_tri, const int *tri[] )
{
    auto zoneName = meshName + "_zones";
    std::vector<int> nodelist( ( ndim_tri + 1 ) * N_tri );
    for ( int i = 0, j = 0; i < N_tri; i++ ) {
        for ( int d = 0; d < ndim_tri + 1; d++, j++ )
            nodelist[j] = tri[d][i];
    }
    int shapetype = 0;
    if ( ndim_tri == 1 )
        shapetype = DB_ZONETYPE_BEAM;
    else if ( ndim_tri == 2 )
        shapetype = DB_ZONETYPE_TRIANGLE;
    else if ( ndim_tri == 3 )
        shapetype = DB_ZONETYPE_PYRAMID;
    else
        ERROR( "Unknown shapetype" );
    int shapesize = ndim_tri + 1;
    int shapecnt  = N_tri;
    DBPutZonelist2( fid, zoneName.c_str(), N_tri, ndim_tri, nodelist.data(), nodelist.size(), 0, 0,
        0, &shapetype, &shapesize, &shapecnt, 1, nullptr );
    DBPutUcdmesh( fid, meshName.c_str(), ndim, nullptr, coords, N, nodelist.size(),
        zoneName.c_str(), nullptr, getType<TYPE>(), nullptr );
}
template<class TYPE>
void readTriMesh( DBfile *fid, const std::string &meshname, Array<TYPE> &coords, Array<int> &tri )
{
    auto mesh   = DBGetUcdmesh( fid, meshname.c_str() );
    int ndim    = mesh->ndims;
    int N_nodes = mesh->nnodes;
    coords.resize( N_nodes, ndim );
    int mesh_type = mesh->datatype;
    for ( int d = 0; d < ndim; d++ ) {
        Array<TYPE> data2( N_nodes );
        copyData<TYPE>( data2, mesh_type, mesh->coords[d] );
        memcpy( &coords( 0, d ), data2.data(), N_nodes * sizeof( TYPE ) );
    }
    auto zones  = mesh->zones;
    int N_zones = zones->nzones;
    ASSERT( zones->nshapes == 1 );
    int shapesize = zones->shapesize[0];
    tri.resize( N_zones, shapesize );
    for ( int i = 0; i < N_zones; i++ ) {
        for ( int j = 0; j < shapesize; j++ )
            tri( i, j ) = zones->nodelist[i * shapesize + j];
    }
    DBFreeUcdmesh( mesh );
}
template<class TYPE>
void writeTriMeshVariable( DBfile *fid, int ndim, const std::string &meshname,
    const std::string &varname, const Array<TYPE> &data, VariableType type )
{
    int nvars            = 0;
    int vartype          = 0;
    const TYPE *vars[10] = { nullptr };
    if ( type == VariableType::NodeVariable ) {
        vartype = DB_NODECENT;
        nvars   = data.size( 1 );
        for ( int i = 0; i < nvars; i++ )
            vars[i] = &data( 0, i );
    } else if ( type == VariableType::EdgeVariable ) {
        ERROR( "Not finished" );
    } else if ( type == VariableType::SurfaceVariable ) {
        ERROR( "Not finished" );
    } else if ( type == VariableType::VolumeVariable ) {
        vartype = DB_ZONECENT;
        nvars   = data.size( 1 );
        for ( int i = 0; i < nvars; i++ )
            vars[i] = &data( 0, i );
    } else {
        ERROR( "Invalid variable type" );
    }
    auto suffix = getVarSuffix( ndim, nvars );
    std::vector<std::string> var_names( nvars );
    for ( int i = 0; i < nvars; i++ )
        var_names[i] = varname + suffix[i];
    std::vector<char *> varnames( nvars, nullptr );
    for ( int i = 0; i < nvars; i++ )
        varnames[i] = const_cast<char *>( var_names[i].c_str() );
    DBPutUcdvar( fid, varname.c_str(), meshname.c_str(), nvars, varnames.data(), vars,
        data.size( 0 ), nullptr, 0, getType<TYPE>(), vartype, nullptr );
}
template<class TYPE>
Array<TYPE> readTriMeshVariable( DBfile *fid, const std::string &varname )
{
    auto var = DBGetUcdvar( fid, varname.c_str() );
    ASSERT( var != nullptr );
    Array<TYPE> data( var->nels, var->nvals );
    int type = var->datatype;
    for ( int i = 0; i < var->nvals; i++ ) {
        Array<TYPE> data2( var->nels );
        copyData<TYPE>( data2, type, var->vals[i] );
        memcpy( &data( 0, i ), data2.data(), var->nels * sizeof( TYPE ) );
    }
    DBFreeUcdvar( var );
    return data;
}


} // namespace silo
} // namespace IO


#endif

#endif
