#include <petsc/private/matimpl.h>
#include <htool/misc/petsc.hpp>

class WrapperHtool : public htool::VirtualGenerator<PetscScalar> {
  PetscInt        dim;
  MatHtoolKernel &kernel;
  void           *ctx;

public:
  WrapperHtool(PetscInt M, PetscInt N, PetscInt sdim, MatHtoolKernel &g, void *kernelctx) : VirtualGenerator(M, N), dim(sdim), kernel(g), ctx(kernelctx) { }
  void copy_submatrix(PetscInt M, PetscInt N, const PetscInt *rows, const PetscInt *cols, PetscScalar *ptr) const {
#if !PetscDefined(HAVE_OPENMP)
    PetscFunctionBegin;
#endif
    PetscCallAbort(PETSC_COMM_SELF, kernel(dim, M, N, rows, cols, ptr, ctx));
#if !PetscDefined(HAVE_OPENMP)
    PetscFunctionReturnVoid();
#endif
  }
};

struct Mat_Htool {
  PetscInt                            dim;
  PetscReal                          *gcoords_target;
  PetscReal                          *gcoords_source;
  PetscScalar                        *work_target;
  PetscScalar                        *work_source;
  PetscScalar                         s;
  PetscInt                            bs[2];
  PetscReal                           epsilon;
  PetscReal                           eta;
  PetscInt                            depth[2];
  MatHtoolCompressorType              compressor;
  MatHtoolClusteringType              clustering;
  MatHtoolKernel                      kernel;
  void                               *kernelctx;
  WrapperHtool                       *wrapper;
  htool::VirtualHMatrix<PetscScalar> *hmatrix;
};

struct MatHtoolKernelTranspose {
  Mat            A;
  MatHtoolKernel kernel;
  void          *kernelctx;
};