/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
 *                                                                          *
 *   Copyright (c) 2005-2026 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *                                                                          *
 *   The aGrUM/pyAgrum library is free software; you can redistribute it    *
 *   and/or modify it under the terms of either :                           *
 *                                                                          *
 *    - the GNU Lesser General Public License as published by               *
 *      the Free Software Foundation, either version 3 of the License,      *
 *      or (at your option) any later version,                              *
 *    - the MIT license (MIT),                                              *
 *    - or both in dual license, as here.                                   *
 *                                                                          *
 *   (see https://agrum.gitlab.io/articles/dual-licenses-lgplv3mit.html)    *
 *                                                                          *
 *   This aGrUM/pyAgrum library is distributed in the hope that it will be  *
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 *   See LICENCES for more details.                                         *
 *                                                                          *
 *   SPDX-FileCopyrightText: Copyright 2005-2026                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
 *   SPDX-License-Identifier: LGPL-3.0-or-later OR MIT                      *
 *                                                                          *
 *   Contact  : info_at_agrum_dot_org                                       *
 *   homepage : http://agrum.gitlab.io                                      *
 *   gitlab   : https://gitlab.com/agrumery/agrum                           *
 *                                                                          *
 ****************************************************************************/


/**
 * @file
 * @brief Implementation of the DFSCode class.
 *
 * @author Lionel TORTI and Pierre-Henri WUILLEMIN(_at_LIP6)
 */

#include <agrum/PRM/gspan/DFSCode.h>

#ifdef GUM_NO_INLINE
#  include <agrum/PRM/gspan/DFSCode_inl.h>
#endif   // GUM_NO_INLINE

namespace gum {
  namespace prm {
    namespace gspan {

      std::ostream& operator<<(std::ostream& out, const DFSCode& code) {
        out << "[ ";
        bool first = true;

        for (const auto item: code.codes) {
          if (!first) out << ", ";
          out << *item;
          first = false;
        }

        out << " ]";
        return out;
      }

      bool DFSCode::operator==(const DFSCode& from) const {
        if (codes.size() == from.codes.size()) {
          for (size_t idx = 0; idx < codes.size(); ++idx) {
            if ((*codes[idx]) != (*codes[idx])) { return false; }
          }

          return true;
        } else {
          return false;
        }
      }

      bool DFSCode::operator!=(const DFSCode& from) const {
        if (codes.size() == from.codes.size()) {
          for (size_t idx = 0; idx < codes.size(); ++idx) {
            if ((*codes[idx]) != (*codes[idx])) { return true; }
          }

          return false;
        } else {
          return true;
        }
      }

      bool DFSCode::operator<(const DFSCode& from) const {
        DFSCode::const_iterator iter = codes.begin();
        DFSCode::const_iterator jter = from.codes.begin();

        for (; (iter != codes.end()) && (jter != from.codes.end()); ++iter, ++jter) {
          if ((**iter) != (**jter)) {
            EdgeCode& alpha = **iter;
            EdgeCode& beta  = **jter;

            if (alpha.isBackward()) {
              if (beta.isForward()) {
                return true;
              } else if (alpha.j < beta.j) {
                // beta is a backward edge
                return true;
              } else if ((alpha.j == beta.j) && (alpha.l_ij < beta.l_ij)) {
                return true;
              }

              return false;
            } else {
              // alpha is a forward edge
              if (beta.isBackward()) {
                return false;
              } else if (beta.i < alpha.i) {
                // Beta is a forward edge
                return true;
              } else if (beta.i == alpha.i) {
                if (alpha.l_i < beta.l_i) {
                  return true;
                } else if (alpha.l_i == beta.l_i) {
                  if (alpha.l_ij < beta.l_ij) {
                    return true;
                  } else if (alpha.l_ij == beta.l_ij) {
                    return alpha.l_j < beta.l_j;
                  }
                }
              }

              return false;
            }

            return (**iter) < (**jter);
          }
        }

        return false;
      }
    } /* namespace gspan */
  } /* namespace prm */
} /* namespace gum */
