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

/*

 * Copyright (c) 2012 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)

 *

 * 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: Manuel Requena <manuel.requena@cttc.es>

 */

#ifndef LTE_RLC_SEQUENCE_NUMBER_H

#define LTE_RLC_SEQUENCE_NUMBER_H

#include <limits>

#include <iostream>

#include <stdint.h>

// #include "ns3/lte-rlc.h"

namespace ns3 {

class SequenceNumber10

{

public:

  SequenceNumber10 ()

    : m_value (0),

      m_modulusBase (0)

  {}

  explicit SequenceNumber10 (uint16_t value)

    : m_value (value % 1024),

      m_modulusBase (0)

  {}

  SequenceNumber10 (SequenceNumber10 const &value)

    : m_value (value.m_value),

      m_modulusBase (value.m_modulusBase)

  {}

  SequenceNumber10& operator= (uint16_t value)

  {

    m_value = value % 1024;

    return *this;

  }

  /**

   * \brief Extracts the numeric value of the sequence number

   * \returns the sequence number value

   */

  uint16_t GetValue () const

  {

    return m_value;

  }

  void SetModulusBase (SequenceNumber10 modulusBase)

  {

    m_modulusBase = modulusBase.m_value;

  }

  void SetModulusBase (uint16_t modulusBase)

  {

    m_modulusBase = modulusBase;

  }

   // postfix ++

  SequenceNumber10 operator++ (int)

  {

    SequenceNumber10 retval (m_value);

    m_value = (m_value + 1) % 1024;

    return retval;

  }

  SequenceNumber10 operator + (uint16_t delta) const

  {

    SequenceNumber10 ret ((m_value + delta) % 1024);

    ret.SetModulusBase (m_modulusBase);

    return ret;

  }

  SequenceNumber10 operator - (uint16_t delta) const

  {

    SequenceNumber10 ret ((m_value - delta) % 1024);

    ret.SetModulusBase (m_modulusBase);

    return ret;

  }

  uint16_t operator - (const SequenceNumber10 &other) const

  {

    uint16_t diff = m_value - other.m_value;

    return (diff);

  }

  bool operator > (const SequenceNumber10 &other) const

  {

    SequenceNumber10 v1 ((m_value - m_modulusBase) % 1024);

    SequenceNumber10 v2 ((other.m_value - other.m_modulusBase) % 1024);

    return ( v1.GetValue () > v2.GetValue () );

  }

  bool operator == (const SequenceNumber10 &other) const

  {

    return (m_value == other.m_value);

  }

  bool operator != (const SequenceNumber10 &other) const

  {

    return (m_value != other.m_value);

  }

  bool operator <= (const SequenceNumber10 &other) const

  {

    return (!this->operator> (other));

  }

  bool operator >= (const SequenceNumber10 &other) const

  {

    return (this->operator> (other) || this->operator== (other));

  }

  bool operator < (const SequenceNumber10 &other) const

  {

    return !this->operator> (other) && m_value != other.m_value;

  }

  friend std::ostream & operator<< (std::ostream& os, const SequenceNumber10 &val);

private:

  uint16_t m_value;

  uint16_t m_modulusBase;

};

} // namespace ns3

#endif // LTE_RLC_SEQUENCE_NUMBER_H