/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2011 UCLA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author:  Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 */

#ifndef NDN_GLOBAL_ROUTING_HELPER_H
#define NDN_GLOBAL_ROUTING_HELPER_H

#include "ns3/ndnSIM/model/ndn-common.hpp"

#include "ns3/ptr.h"

namespace ns3 {

class Node;
class NodeContainer;
class Channel;

namespace ndn {

/**
 * @ingroup ndn-helpers
 * @brief Helper for GlobalRouter interface
 */
class GlobalRoutingHelper {
public:
  /**
   * @brief Install GlobalRouter interface on a node
   *
   * Note that GlobalRouter will also be installed on all connected nodes and channels
   *
   * @param node Node to install GlobalRouter interface
   */
  void
  Install(Ptr<Node> node);

  /**
   * @brief Install GlobalRouter interface on nodes
   *
   * Note that GlobalRouter will also be installed on all connected nodes and channels
   *
   * @param nodes NodeContainer to install GlobalRouter interface
   */
  void
  Install(const NodeContainer& nodes);

  /**
   * @brief Install GlobalRouter interface on all nodes
   */
  void
  InstallAll();

  /**
   * @brief Add `prefix' as origin on `node'
   * @param prefix Prefix that is originated by node, e.g., node is a producer for this prefix
   * @param node   Pointer to a node
   */
  void
  AddOrigin(const std::string& prefix, Ptr<Node> node);

  /**
   * @brief Add `prefix' as origin on all `nodes'
   * @param prefix Prefix that is originated by nodes
   * @param nodes NodeContainer
   */
  void
  AddOrigins(const std::string& prefix, const NodeContainer& nodes);

  /**
   * @brief Add `prefix' as origin on node `nodeName'
   * @param prefix     Prefix that is originated by node, e.g., node is a producer for this prefix
   * @param nodeName   Name of the node that is associated with Ptr<Node> using ns3::Names
   */
  void
  AddOrigin(const std::string& prefix, const std::string& nodeName);

  /**
   * @brief Add origin to each node based on the node's name (using Names class)
   */
  void
  AddOriginsForAll();

  /**
   * @brief Calculate for every node shortest path trees and install routes to all prefix origins
   *
   * @param invalidatedRoutes flag indicating whether existing routes should be invalidated or keps
   *as is
   */
  static void
  CalculateRoutes(bool invalidatedRoutes = true);

  /**
   * @brief Calculate all possible next-hop independent alternative routes
   *
   * @param invalidatedRoutes flag indicating whether existing routes should be invalidated or keps
   *as is
   *
   * Refer to the implementation for more details.
   *
   * Note that this method is highly experimental and should be used with caution (very time
   *consuming).
   */
  static void
  CalculateAllPossibleRoutes(bool invalidatedRoutes = true);

private:
  void
  Install(Ptr<Channel> channel);
};

} // namespace ndn
} // namespace ns3

#endif // NDN_GLOBAL_ROUTING_HELPER_H