/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2023,  The University of Memphis,
 *                           Regents of the University of California,
 *                           Arizona Board of Regents.
 *
 * This file is part of NLSR (Named-data Link State Routing).
 * See AUTHORS.md for complete list of NLSR authors and contributors.
 *
 * NLSR 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.
 *
 * NLSR 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
 * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NLSR_NAME_PREFIX_LIST_HPP
#define NLSR_NAME_PREFIX_LIST_HPP

#include "test-access-control.hpp"

#include <ndn-cxx/name.hpp>

#include <boost/operators.hpp>

#include <initializer_list>
#include <list>
#include <map>
#include <set>
#include <string>
#include <vector>

namespace nlsr {

class NamePrefixList : private boost::equality_comparable<NamePrefixList>
{
public:
  using NamePair = std::tuple<ndn::Name, std::vector<std::string>>;

  enum NamePairIndex {
    NAME,
    SOURCES
  };

  NamePrefixList();

  explicit
  NamePrefixList(ndn::span<const ndn::Name> names);

#ifdef WITH_TESTS
  NamePrefixList(std::initializer_list<ndn::Name> names)
    : NamePrefixList(ndn::span<const ndn::Name>(names))
  {
  }

  NamePrefixList(std::initializer_list<NamePair> namesAndSources)
  {
    for (const auto& np : namesAndSources) {
      for (const auto& source : std::get<NamePrefixList::NamePairIndex::SOURCES>(np)) {
        insert(std::get<NamePrefixList::NamePairIndex::NAME>(np), source);
      }
    }
  }
#endif

  /*! \brief inserts name into NamePrefixList
      \retval true If the name was successfully inserted.
      \retval false If the name could not be inserted.
   */
  bool
  insert(const ndn::Name& name, const std::string& source = "");

  /*! \brief removes name from NamePrefixList
      \retval true If the name is removed
      \retval false If the name failed to be removed.
   */
  bool
  erase(const ndn::Name& name, const std::string& source = "");

  size_t
  size() const
  {
    return m_namesSources.size();
  }

  std::list<ndn::Name>
  getNames() const;

  /*! Returns how many unique sources this name has.

    \retval 0 if the name is not in the list, else the number of sources.
   */
  uint32_t
  countSources(const ndn::Name& name) const;

  /*! Returns the sources that this name has.

    \retval an empty vector if the name is not in the list, else a
    vector containing the sources.
   */
  const std::vector<std::string>
  getSources(const ndn::Name& name) const;

  void
  clear()
  {
    m_namesSources.clear();
  }

private: // non-member operators
  // NOTE: the following "hidden friend" operators are available via
  //       argument-dependent lookup only and must be defined inline.
  // boost::equality_comparable provides != operators.

  friend bool
  operator==(const NamePrefixList& lhs, const NamePrefixList& rhs)
  {
    return lhs.getNames() == rhs.getNames();
  }

private:
  std::map<ndn::Name, std::set<std::string>> m_namesSources;
};

std::ostream&
operator<<(std::ostream& os, const NamePrefixList& list);

} // namespace nlsr

#endif // NLSR_NAME_PREFIX_LIST_HPP