/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2004 Francisco J. Ros 

 * Copyright (c) 2007 INESC Porto

 *

 * 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

 *

 * Authors: Francisco J. Ros  <fjrm@dif.um.es>

 *          Gustavo J. A. M. Carneiro <gjc@inescporto.pt>

 */

#ifndef __OLSR_AGENT_IMPL_H__

#define __OLSR_AGENT_IMPL_H__

#include <vector>

#include "olsr-agent.h"

#include "olsr-header.h"

#include "olsr-state.h"

#include "routing-table.h"

#include "repositories.h"

#include "ns3/object.h"

#include "ns3/packet.h"

#include "ns3/node.h"

#include "ns3/socket.h"

#include "ns3/timer.h"

#include "ns3/callback-trace-source.h"

namespace ns3 {

namespace olsr {

class AgentImpl : public Agent

{

public:

  AgentImpl (Ptr<Node> node);

  virtual void Start ();

  virtual void SetMainInterface (uint32_t interface);

private:

  EventGarbageCollector m_events;

  /// Address of the routing agent.

  Ipv4Address m_routingAgentAddr;

  /// Packets sequence number counter.

  uint16_t m_packetSequenceNumber;

  /// Messages sequence number counter.

  uint16_t m_messageSequenceNumber;

  /// Advertised Neighbor Set sequence number.

  uint16_t m_ansn;

  /// HELLO messages' emission interval.

  Time m_helloInterval;

  /// TC messages' emission interval.

  Time m_tcInterval;

  /// MID messages' emission interval.

  Time m_midInterval;

  /// Willingness for forwarding packets on behalf of other nodes.

  uint8_t m_willingness;

  /// Determines if layer 2 notifications are enabled or not.

  bool m_useL2Notifications;

  /// Routing table.

  Ptr<RoutingTable> m_routingTable;

  /// Internal state with all needed data structs.

  OlsrState m_state;

  Ptr<Ipv4> m_ipv4;

protected:

  void DoDispose ();

  Ptr<TraceResolver> GetTraceResolver (void) const;

  void SendPacket (Ptr<Packet> packet, const MessageList &containedMessages);

  /// Increments packet sequence number and returns the new value.

  inline uint16_t GetPacketSequenceNumber ();

  /// Increments message sequence number and returns the new value.

  inline uint16_t GetMessageSequenceNumber ();

  void RecvOlsr (Ptr<Socket> socket,

                 Ptr<Packet> receivedPacket,

                 const Address &sourceAddress);

  void MprComputation ();

  void RoutingTableComputation ();

  Ipv4Address GetMainAddress (Ipv4Address iface_addr) const;

  // Timer handlers

  Timer m_helloTimer;

  void HelloTimerExpire ();

  Timer m_tcTimer;

  void TcTimerExpire ();

  Timer m_midTimer;

  void MidTimerExpire ();

  void DupTupleTimerExpire (DuplicateTuple tuple);

  bool m_linkTupleTimerFirstTime;

  void LinkTupleTimerExpire (LinkTuple tuple);

  void Nb2hopTupleTimerExpire (TwoHopNeighborTuple tuple);

  void MprSelTupleTimerExpire (MprSelectorTuple tuple);

  void TopologyTupleTimerExpire (TopologyTuple tuple);

  void IfaceAssocTupleTimerExpire (IfaceAssocTuple tuple);

  /// A list of pending messages which are buffered awaiting for being sent.

  olsr::MessageList m_queuedMessages;

  Timer m_queuedMessagesTimer; // timer for throttling outgoing messages

  void ForwardDefault (olsr::MessageHeader olsrMessage,

                       DuplicateTuple *duplicated,

                       const Ipv4Address &localIface,

                       const Ipv4Address &senderAddress);

  void QueueMessage (const olsr::MessageHeader &message, Time delay);

  void SendQueuedMessages ();

  void SendHello ();

  void SendTc ();

  void SendMid ();

  void NeighborLoss (const LinkTuple &tuple);

  void AddDuplicateTuple (const DuplicateTuple &tuple);

  void RemoveDuplicateTuple (const DuplicateTuple &tuple);

  LinkTuple & AddLinkTuple (const LinkTuple &tuple, uint8_t willingness);

  void RemoveLinkTuple (const LinkTuple &tuple);

  void LinkTupleUpdated (const LinkTuple &tuple);

  void AddNeighborTuple (const NeighborTuple &tuple);

  void RemoveNeighborTuple (const NeighborTuple &tuple);

  void AddTwoHopNeighborTuple (const TwoHopNeighborTuple &tuple);

  void RemoveTwoHopNeighborTuple (const TwoHopNeighborTuple &tuple);

  void AddMprSelectorTuple (const MprSelectorTuple  &tuple);

  void RemoveMprSelectorTuple (const MprSelectorTuple &tuple);

  void AddTopologyTuple (const TopologyTuple &tuple);

  void RemoveTopologyTuple (const TopologyTuple &tuple);

  void AddIfaceAssocTuple (const IfaceAssocTuple &tuple);

  void RemoveIfaceAssocTuple (const IfaceAssocTuple &tuple);

  void ProcessHello (const olsr::MessageHeader &msg,

                     const Ipv4Address &receiverIface,

                     const Ipv4Address &senderIface);

  void ProcessTc (const olsr::MessageHeader &msg,

                  const Ipv4Address &senderIface);

  void ProcessMid (const olsr::MessageHeader &msg,

                   const Ipv4Address &senderIface);

  void LinkSensing (const olsr::MessageHeader &msg,

                    const olsr::MessageHeader::Hello &hello,

                    const Ipv4Address &receiverIface,

                    const Ipv4Address &sender_iface);

  void PopulateNeighborSet (const olsr::MessageHeader &msg,

                            const olsr::MessageHeader::Hello &hello);

  void PopulateTwoHopNeighborSet (const olsr::MessageHeader &msg,

                                  const olsr::MessageHeader::Hello &hello);

  void PopulateMprSelectorSet (const olsr::MessageHeader &msg,

                               const olsr::MessageHeader::Hello &hello);

  int Degree (NeighborTuple const &tuple);

  Ipv4Address m_mainAddress;

  Ptr<Socket> m_receiveSocket; // UDP socket for receving OSLR packets

  Ptr<Socket> m_sendSocket; // UDP socket for sending OSLR packets

  CallbackTraceSource <const PacketHeader &,

                       const MessageList &> m_rxPacketTrace;

  CallbackTraceSource <const PacketHeader &,

                       const MessageList &> m_txPacketTrace;

};

}} // namespace ns3

#endif