/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014-2017,  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_LSA_HPP
#define NLSR_LSA_HPP

#include <boost/cstdint.hpp>
#include <ndn-cxx/util/scheduler.hpp>
#include <ndn-cxx/util/time.hpp>

#include "adjacent.hpp"
#include "name-prefix-list.hpp"
#include "adjacency-list.hpp"

namespace nlsr {

class Nlsr;

class Lsa
{
public:
  Lsa(const std::string& lsaType)
    : m_origRouter()
    , m_lsType(lsaType)
    , m_lsSeqNo()
    , m_expirationTimePoint()
    , m_expiringEventId()
  {
  }

  const std::string&
  getLsType() const
  {
    return m_lsType;
  }

  void
  setLsSeqNo(uint32_t lsn)
  {
    m_lsSeqNo = lsn;
  }

  uint32_t
  getLsSeqNo() const
  {
    return m_lsSeqNo;
  }

  const ndn::Name&
  getOrigRouter() const
  {
    return m_origRouter;
  }

  void
  setOrigRouter(const ndn::Name& org)
  {
    m_origRouter = org;
  }

  const ndn::time::system_clock::TimePoint&
  getExpirationTimePoint() const
  {
    return m_expirationTimePoint;
  }

  void
  setExpirationTimePoint(const ndn::time::system_clock::TimePoint& lt)
  {
    m_expirationTimePoint = lt;
  }

  void
  setExpiringEventId(const ndn::EventId leei)
  {
    m_expiringEventId = leei;
  }

  ndn::EventId
  getExpiringEventId() const
  {
    return m_expiringEventId;
  }

protected:
  ndn::Name m_origRouter;
  const std::string m_lsType;
  uint32_t m_lsSeqNo;
  ndn::time::system_clock::TimePoint m_expirationTimePoint;
  ndn::EventId m_expiringEventId;
};

class NameLsa: public Lsa
{
public:
  NameLsa()
    : Lsa(NameLsa::TYPE_STRING)
    , m_npl()
  {
  }

  NameLsa(const ndn::Name& origR, uint32_t lsn,
          const ndn::time::system_clock::TimePoint& lt,
          NamePrefixList& npl);

  NamePrefixList&
  getNpl()
  {
    return m_npl;
  }

  const NamePrefixList&
  getNpl() const
  {
    return m_npl;
  }

  void
  addName(const ndn::Name& name)
  {
    m_npl.insert(name);
  }

  void
  removeName(const ndn::Name& name)
  {
    m_npl.remove(name);
  }

  /*! \brief Gets the key for this LSA.

    Format is: \<router name\>/\<LSA type>\
   */
  const ndn::Name
  getKey() const;

  /*! \brief Returns the data that this name LSA has.

    Format is: \<original router
    prefix\>|name|\<seq. no.\>|\<exp. time\>|\<prefix 1\>|\<prefix
    2\>|...|\<prefix n\>|
   */
  std::string
  getData();

  /*! \brief Initializes this LSA object with content's data.

    \param content The data (e.g. name prefixes) to initialize this LSA with.

    This function initializes this object to represent the data
    contained in content. The format for this is the same as for
    getData(); getData() returns data of this format, in other words.
   */
  bool
  initializeFromContent(const std::string& content);

  bool
  isEqualContent(const NameLsa& other) const;

  void
  writeLog();

private:
  NamePrefixList m_npl;
public:
  static const std::string TYPE_STRING;
};

class AdjLsa: public Lsa
{
public:
  typedef AdjacencyList::const_iterator const_iterator;

  AdjLsa()
    : Lsa(AdjLsa::TYPE_STRING)
    , m_adl()
  {
  }

  AdjLsa(const ndn::Name& origR, uint32_t lsn,
         const ndn::time::system_clock::TimePoint& lt,
         uint32_t nl , AdjacencyList& adl);

  AdjacencyList&
  getAdl()
  {
    return m_adl;
  }

  void
  addAdjacent(Adjacent adj)
  {
    m_adl.insert(adj);
  }

  const ndn::Name
  getKey() const;

  /*! \brief Returns the data this adjacency LSA has.

    The format is: \<original
    router\>|adjacency|\<seq. no.\>|\<exp. time\>|\<size\>|\<adjacency prefix
    1\>|\<face uri 1\>|\<cost 1\>|...|\<adjacency prefix n\>|\<face uri
    n\>|\<cost n\>|
   */
  std::string
  getData();

  /*! \brief Initializes this adj. LSA from the supplied content.

    \param content The content that this LSA is to have, formatted
    according to getData().
   */
  bool
  initializeFromContent(const std::string& content);

  uint32_t
  getNoLink()
  {
    return m_noLink;
  }

  bool
  isEqualContent(AdjLsa& alsa);

  /*! \brief Installs this LSA's name prefixes into the NPT.

    \param pnlsr The NLSR top-level whose NPT you want to install the
    entries into.
   */
  void
  addNptEntries(Nlsr& pnlsr);

  void
  removeNptEntries(Nlsr& pnlsr);

  void
  writeLog();

public:
  const_iterator
  begin() const
  {
    return m_adl.begin();
  }

  const_iterator
  end() const
  {
    return m_adl.end();
  }

private:
  uint32_t m_noLink;
  AdjacencyList m_adl;

public:
  static const std::string TYPE_STRING;
};

class CoordinateLsa: public Lsa
{
public:
  CoordinateLsa()
    : Lsa(CoordinateLsa::TYPE_STRING)
    , m_corRad(0)
    , m_corTheta(0)
  {
  }

  CoordinateLsa(const ndn::Name& origR, uint32_t lsn,
                const ndn::time::system_clock::TimePoint& lt,
                double r, double theta);

  const ndn::Name
  getKey() const;

  /*! \brief Returns the data that this coordinate LSA represents.

    The format is: \<original
    router\>|coordinate|\<seq. no.\>|\<exp. time\>|\<radians\>|\<theta\>|
  */
  std::string
  getData();

  /*! \brief Initializes this coordinate LSA with the data in content.

    \param content The string content that is used to build the LSA.

    This function initializes this LSA object to represent the data
    specified by the parameter. The format that it is expecting is the
    same as for getData();
  */
  bool
  initializeFromContent(const std::string& content);

  double
  getCorRadius() const
  {
      return m_corRad;
  }

  void
  setCorRadius(double cr)
  {
      m_corRad = cr;
  }

  double
  getCorTheta() const
  {
    return m_corTheta;
  }

  void
  setCorTheta(double ct)
  {
    m_corTheta = ct;
  }

  bool
  isEqualContent(const CoordinateLsa& clsa);

  void
  writeLog();

private:
  double m_corRad;
  double m_corTheta;

public:
  static const std::string TYPE_STRING;
};

std::ostream&
operator<<(std::ostream& os, const AdjLsa& adjLsa);

} // namespace nlsr

#endif // NLSR_LSA_HPP