/*

Copyright (C) 2005-2015 David Bateman
Copyright (C) 1998-2005 Andy Adler

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdarg.h>
#include "lo-error.h"
#include "oct-sparse.h"
#include "sparse-util.h"

// FIXME: this overload is here due to API change in SuiteSparse (3.1 -> 3.2)

#ifdef HAVE_CHOLMOD

void
SparseCholError (int status, char *file, int line, char *message)
{
  SparseCholError (status, file, line, message);
}

void
SparseCholError (int status, const char *file, int line, const char *message)
{

  // Ignore CHOLMOD_NOT_POSDEF, since we handle that in Fchol as an
  // error or exit status.
  if (status != CHOLMOD_NOT_POSDEF)
    (*current_liboctave_warning_with_id_handler)
      ("Octave:cholmod-message", "warning %i, at line %i in file %s: %s",
       status, line, file, message);
}

int
SparseCholPrint (const char *fmt, ...)
{
  va_list args;
  va_start (args, fmt);
  int ret = gnulib::vfprintf (stderr, fmt, args);
  gnulib::fflush (stderr);
  va_end (args);
  return ret;
}

#endif //HAVE_CHOLMOD

bool
sparse_indices_ok (octave_idx_type *r, octave_idx_type *c,
                   octave_idx_type nrows, octave_idx_type ncols,
                   octave_idx_type nnz)
{
  if (nnz > 0)
    {
      if (c[0] != 0)
        {
          (*current_liboctave_error_handler)
            ("invalid sparse matrix: cidx[0] must be zero");
          return false;
        }

      octave_idx_type jold = 0;

      for (octave_idx_type j = 1; j < ncols+1; j++)
        {
          if (c[j] < c[j-1])
            {
              (*current_liboctave_error_handler)
                ("invalid sparse matrix: cidx elements must appear in ascending order");
              return false;
            }

          if (c[j] > nnz)
            {
              (*current_liboctave_error_handler)
                ("invalid sparse matrix: cidx[%d] = %d exceeds number of nonzero elements",
                 j, c[j]+1);
              return false;
            }

          if (c[j] != jold)
            {
              for (octave_idx_type i = jold+1; i < c[j]; i++)
                {
                  if (r[i] < r[i-1])
                    {
                      (*current_liboctave_error_handler)
                        ("invalid sparse matrix: ridx elements must appear in ascending order for each column");
                      return false;
                    }

                  if (r[i] >= nrows)
                    {
                      (*current_liboctave_error_handler)
                        ("invalid sparse matrix: ridx[%d] = %d out of range",
                         i, r[i]+1);
                      return false;
                    }
                }

              jold = c[j];
            }
        }
    }

  return true;
}