/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2008,2009 IITP RAS
 *
 * 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: Kirill Andreev <andreev@iitp.ru>
 */

#ifndef WIFI_PREQ_INFORMATION_ELEMENT_H
#define WIFI_PREQ_INFORMATION_ELEMENT_H

#include <vector>

#include "ns3/mac48-address.h"
#include "ns3/mesh-information-element-vector.h"

namespace ns3 {
namespace dot11s {
/**
 * \ingroup dot11s
 * \brief Describes an address unit in PREQ information element
 * See 7.3.2.96 for more details
 */
class DestinationAddressUnit : public SimpleRefCount<DestinationAddressUnit>
{
public:
  DestinationAddressUnit ();
  void SetFlags (bool doFlag, bool rfFlag, bool usnFlag);
  void SetDestinationAddress (Mac48Address dest_address);
  void SetDestSeqNumber (uint32_t dest_seq_number);
  bool IsDo ();
  bool IsRf ();
  bool IsUsn ();
  Mac48Address GetDestinationAddress () const;
  uint32_t GetDestSeqNumber () const;
private:
  bool m_do;
  bool m_rf;
  bool m_usn;
  Mac48Address m_destinationAddress;
  uint32_t m_destSeqNumber;

  friend bool operator== (const DestinationAddressUnit & a, const DestinationAddressUnit & b);
};
/**
 * \ingroup dot11s
 * \brief See 7.3.2.96 of 802.11s draft 2.07
 */
class IePreq : public WifiInformationElement
{
public:
  IePreq ();
  ~IePreq ();
  /**
   * Add a destination address unit: flags, destination and sequence
   * number
   */
  void AddDestinationAddressElement (
    bool doFlag,
    bool rfFlag,
    Mac48Address dest_address,
    uint32_t dest_seq_number
    );
  /// Delete a destination address unit by destination
  void DelDestinationAddressElement (Mac48Address dest_address);
  /// Clear PREQ: remove all destinations
  void ClearDestinationAddressElements ();
  /// Get all destinations, which are stored in PREQ:
  std::vector<Ptr<DestinationAddressUnit> > GetDestinationList ();
  /// SetProper flags which indicate that PREQ is unicast
  void SetUnicastPreq ();
  /*
   * \brief In proactive case: need we send PREP
   */
  void SetNeedNotPrep ();

  // Setters for fields:
  void SetHopcount (uint8_t hopcount);
  void SetTTL (uint8_t ttl);
  void SetPreqID (uint32_t id);
  void SetOriginatorAddress (Mac48Address originator_address);
  void SetOriginatorSeqNumber (uint32_t originator_seq_number);
  void SetLifetime (uint32_t lifetime);
  void SetMetric (uint32_t metric);
  void SetDestCount (uint8_t dest_count);

  // Getters for fields:
  bool  IsUnicastPreq () const;
  bool  IsNeedNotPrep () const;
  uint8_t  GetHopCount () const;
  uint8_t  GetTtl () const;
  uint32_t GetPreqID () const;
  Mac48Address GetOriginatorAddress () const;
  uint32_t GetOriginatorSeqNumber () const;
  uint32_t GetLifetime () const;
  uint32_t GetMetric () const;
  uint8_t  GetDestCount () const;

  /// Handle TTL and Metric:
  void  DecrementTtl ();
  void  IncrementMetric (uint32_t metric);
  /*
   * \brief Checks that preq's originator address equals to originator, and
   * this preq is not proactive
   */
  bool MayAddAddress (Mac48Address originator);
  bool IsFull () const;
  
  // Inherited from WifiInformationElement
  virtual WifiInformationElementId ElementId () const;
  virtual void SerializeInformationField (Buffer::Iterator i) const;
  virtual uint8_t DeserializeInformationField (Buffer::Iterator i, uint8_t length);
  virtual uint8_t GetInformationFieldSize () const;
  virtual void Print (std::ostream& os) const;

private:
  /**
   * how many destinations we support
   * \todo make as an attribute
   */
  uint8_t m_maxSize; 

  uint8_t m_flags;
  uint8_t m_hopCount;
  uint8_t m_ttl;
  uint32_t m_preqId;
  Mac48Address m_originatorAddress;
  uint32_t m_originatorSeqNumber;
  uint32_t m_lifetime;
  uint32_t m_metric;
  uint8_t  m_destCount;
  std::vector<Ptr<DestinationAddressUnit> >  m_destinations;

  friend bool operator== (const IePreq & a, const IePreq & b);
};

bool operator== (const DestinationAddressUnit & a, const DestinationAddressUnit & b);
bool operator== (const IePreq & a, const IePreq & b);
std::ostream &operator << (std::ostream &os, const IePreq &preq);

} // namespace dot11s
} // namespace ns3
#endif

