/*

Copyright (C) 1996-2015 John W. Eaton

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/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <cstdlib>

#include <string>

#include "lo-utils.h"
#include "oct-env.h"
#include "pathsearch.h"
#include "singleton-cleanup.h"
#include "str-vec.h"

#include "kpse.cc"

namespace octave
{
  directory_path::static_members *directory_path::static_members::instance = 0;

  directory_path::static_members::static_members (void)
    : xpath_sep_char (SEPCHAR), xpath_sep_str (SEPCHAR_STR) { }

  bool
  directory_path::static_members::instance_ok (void)
  {
    bool retval = true;

    if (! instance)
      {
        instance = new static_members ();

        if (instance)
          singleton_cleanup_list::add (cleanup_instance);
      }

    if (! instance)
      (*current_liboctave_error_handler)
        ("unable to create directory_path::static_members object!");

    return retval;
  }

  string_vector
  directory_path::elements (void)
  {
    return initialized ? pv : string_vector ();
  }

  string_vector
  directory_path::all_directories (void)
  {
    int count = 0;
    string_vector retval;

    if (initialized)
      {
        int len = pv.numel ();

        int nmax = len > 32 ? len : 32;

        retval.resize (len);

        for (int i = 0; i < len; i++)
          {
            str_llist_type *elt_dirs = kpse_element_dirs (pv[i]);

            if (elt_dirs)
              {
                str_llist_elt_type *dir;

                for (dir = *elt_dirs; dir; dir = STR_LLIST_NEXT (*dir))
                  {
                    const std::string elt_dir = STR_LLIST (*dir);

                    if (! elt_dir.empty ())
                      {
                        if (count == nmax)
                          nmax *= 2;

                        retval.resize (nmax);

                        retval[count++] = elt_dir;
                      }
                  }
              }
          }

        retval.resize (count);
      }

    return retval;
  }

  std::string
  directory_path::find_first (const std::string& nm)
  {
    return initialized ? kpse_path_search (p, nm, true) : "";
  }

  string_vector
  directory_path::find_all (const std::string& nm)
  {
    return initialized ? kpse_all_path_search (p, nm) : string_vector ();
  }

  std::string
  directory_path::find_first_of (const string_vector& names)
  {
    return initialized
      ? kpse_path_find_first_of (p, names, true) : "";
  }

  string_vector
  directory_path::find_all_first_of (const string_vector& names)
  {
    return initialized
      ? kpse_all_path_find_first_of (p, names) : string_vector ();
  }

  void
  directory_path::init (void)
  {
    static bool octave_kpathsea_initialized = false;

    if (! octave_kpathsea_initialized)
      {
        std::string val = octave::sys::env::getenv ("KPATHSEA_DEBUG");

        if (! val.empty ())
          kpathsea_debug |= atoi (val.c_str ());

        octave_kpathsea_initialized = true;
      }

    p = kpse_path_expand (p_default.empty ()
                          ? p_orig : kpse_expand_default (p_orig, p_default));

    int count = 0;
    for (kpse_path_iterator pi (p); pi != std::string::npos; pi++)
      count++;

    pv.resize (count);

    kpse_path_iterator pi (p);

    for (int i = 0; i < count; i++)
      pv[i] = *pi++;

    initialized = true;
  }
}