/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2009 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, Include., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: Nicola Baldo <nbaldo@cttc.es>
 *          Sébastien Deronne <sebastien.deronne@gmail.com>
 */

#include <iomanip>
#include <cmath>
#include "ns3/log.h"
#include "radiotap-header.h"

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("RadiotapHeader");

NS_OBJECT_ENSURE_REGISTERED (RadiotapHeader);

RadiotapHeader::RadiotapHeader ()
  : m_length (8),
    m_present (0),
    m_tsft (0),
    m_flags (FRAME_FLAG_NONE),
    m_rate (0),
    m_channelFreq (0),
    m_channelFlags (CHANNEL_FLAG_NONE),
    m_antennaSignal (0),
    m_antennaNoise (0),
    m_ampduStatusRef (0),
    m_ampduStatusFlags (0),
    m_ampduStatusCRC (0),
    m_vhtPad (0),
    m_vhtKnown (0),
    m_vhtFlags (0),
    m_vhtBandwidth (0),
    m_vhtCoding (0),
    m_vhtGroupId (0),
    m_vhtPartialAid (0)
{
  NS_LOG_FUNCTION (this);
}

TypeId RadiotapHeader::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::RadiotapHeader")
    .SetParent<Header> ()
    .SetGroupName ("Network")

    .AddConstructor<RadiotapHeader> ()
  ;
  return tid;
}

TypeId
RadiotapHeader::GetInstanceTypeId (void) const
{
  return GetTypeId ();
}

uint32_t
RadiotapHeader::GetSerializedSize (void) const
{
  NS_LOG_FUNCTION (this);
  return m_length;
}

void
RadiotapHeader::Serialize (Buffer::Iterator start) const
{
  NS_LOG_FUNCTION (this << &start);

  start.WriteU8 (0); // major version of radiotap header
  start.WriteU8 (0); // pad field
  start.WriteU16 (m_length); // entire length of radiotap data + header
  start.WriteU32 (m_present); // bits describing which fields follow header

  //
  // Time Synchronization Function Timer (when the first bit of the MPDU
  // arrived at the MAC)
  //
  if (m_present & RADIOTAP_TSFT) // bit 0
    {
      start.WriteU64 (m_tsft);
    }

  //
  // Properties of transmitted and received frames.
  //
  if (m_present & RADIOTAP_FLAGS) // bit 1
    {
      start.WriteU8 (m_flags);
    }

  //
  // TX/RX data rate in units of 500 kbps
  //
  if (m_present & RADIOTAP_RATE) // bit 2
    {
      start.WriteU8 (m_rate);
    }

  //
  // Tx/Rx frequency in MHz, followed by flags.
  //
  if (m_present & RADIOTAP_CHANNEL) // bit 3
    {
      start.WriteU8 (0, m_channelPad);
      start.WriteU16 (m_channelFreq);
      start.WriteU16 (m_channelFlags);
    }

  //
  // The hop set and pattern for frequency-hopping radios.  We don't need it but
  // still need to account for it.
  //
  if (m_present & RADIOTAP_FHSS) // bit 4
    {
      start.WriteU8 (0); //not yet implemented
    }

  //
  // RF signal power at the antenna, decibel difference from an arbitrary, fixed
  // reference.
  //
  if (m_present & RADIOTAP_DBM_ANTSIGNAL) // bit 5
    {
      start.WriteU8 (m_antennaSignal);
    }

  //
  // RF noise power at the antenna, decibel difference from an arbitrary, fixed
  // reference.
  //
  if (m_present & RADIOTAP_DBM_ANTNOISE) // bit 6
    {
      start.WriteU8 (m_antennaNoise);
    }

  //
  // Quality of Barker code lock.
  //
  if (m_present & RADIOTAP_LOCK_QUALITY) // bit 7
    {
      start.WriteU16 (0); //not yet implemented
    }

  //
  // Transmit power expressed as unitless distance from max power
  // set at factory calibration (0 is max power).
  //
  if (m_present & RADIOTAP_TX_ATTENUATION) // bit 8
    {
      start.WriteU16 (0); //not yet implemented
    }

  //
  // Transmit power expressed as decibel distance from max power
  // set at factory calibration (0 is max power).
  //
  if (m_present & RADIOTAP_DB_TX_ATTENUATION) // bit 9
    {
      start.WriteU16 (0); //not yet implemented
    }

  //
  // Transmit power expressed as dBm (decibels from a 1 milliwatt reference).
  // This is the absolute power level measured at the antenna port.
  //
  if (m_present & RADIOTAP_DBM_TX_POWER) // bit 10
    {
      start.WriteU8 (0); //not yet implemented
    }

  //
  // Unitless indication of the Rx/Tx antenna for this packet.
  // The first antenna is antenna 0.
  //
  if (m_present & RADIOTAP_ANTENNA) // bit 11
    {
      start.WriteU8 (0); //not yet implemented
    }

  //
  // RF signal power at the antenna (decibel difference from an arbitrary fixed reference).
  //
  if (m_present & RADIOTAP_DB_ANTSIGNAL) // bit 12
    {
      start.WriteU8 (0); //not yet implemented
    }

  //
  // RF noise power at the antenna (decibel difference from an arbitrary fixed reference).
  //
  if (m_present & RADIOTAP_DB_ANTNOISE) // bit 13
    {
      start.WriteU8 (0); //not yet implemented
    }

  //
  // Properties of received frames.
  //
  if (m_present & RADIOTAP_RX_FLAGS) // bit 14
    {
      start.WriteU16 (0); //not yet implemented
    }

  //
  // MCS field.
  //
  if (m_present & RADIOTAP_MCS) // bit 19
    {
      start.WriteU8 (m_mcsKnown);
      start.WriteU8 (m_mcsFlags);
      start.WriteU8 (m_mcsRate);
    }

  //
  // A-MPDU Status, information about the received or transmitted A-MPDU.
  //
  if (m_present & RADIOTAP_AMPDU_STATUS) // bit 20
    {
      start.WriteU8 (0, m_ampduStatusPad);
      start.WriteU32 (m_ampduStatusRef);
      start.WriteU16 (m_ampduStatusFlags);
      start.WriteU8 (m_ampduStatusCRC);
      start.WriteU8 (0);
    }

  //
  // Information about the received or transmitted VHT frame.
  //
  if (m_present & RADIOTAP_VHT) // bit 21
    {
      start.WriteU8 (0, m_vhtPad);
      start.WriteU16 (m_vhtKnown);
      start.WriteU8 (m_vhtFlags);
      start.WriteU8 (m_vhtBandwidth);
      for (uint8_t i = 0; i < 4; i++)
        {
          start.WriteU8 (m_vhtMcsNss[i]);
        }
      start.WriteU8 (m_vhtCoding);
      start.WriteU8 (m_vhtGroupId);
      start.WriteU16 (m_vhtPartialAid);
    }
}

uint32_t
RadiotapHeader::Deserialize (Buffer::Iterator start)
{
  NS_LOG_FUNCTION (this << &start);

  uint8_t tmp = start.ReadU8 (); // major version of radiotap header
  NS_ASSERT_MSG (tmp == 0x00, "RadiotapHeader::Deserialize(): Unexpected major version");
  start.ReadU8 (); // pad field

  m_length = start.ReadU16 (); // entire length of radiotap data + header
  m_present = start.ReadU32 (); // bits describing which fields follow header

  uint32_t bytesRead = 8;

  //
  // Time Synchronization Function Timer (when the first bit of the MPDU arrived at the MAC)
  //
  if (m_present & RADIOTAP_TSFT) // bit 0
    {
      m_tsft = start.ReadU64 ();
      bytesRead += 8;
    }

  //
  // Properties of transmitted and received frames.
  //
  if (m_present & RADIOTAP_FLAGS) // bit 1
    {
      m_flags = start.ReadU8 ();
      ++bytesRead;
    }

  //
  // TX/RX data rate in units of 500 kbps
  //
  if (m_present & RADIOTAP_RATE) // bit 2
    {
      m_rate = start.ReadU8 ();
      ++bytesRead;
    }

  //
  // Tx/Rx frequency in MHz, followed by flags.
  //
  if (m_present & RADIOTAP_CHANNEL) // bit 3
    {
      m_channelPad = ((2 - bytesRead % 2) % 2);
      start.Next (m_channelPad);
      m_channelFreq = start.ReadU16 ();
      m_channelFlags = start.ReadU16 ();
      bytesRead += (4 + m_channelPad);
    }

  //
  // The hop set and pattern for frequency-hopping radios.  We don't need it but
  // still need to account for it.
  //
  if (m_present & RADIOTAP_FHSS) // bit 4
    {
      //not yet implemented
      start.ReadU8 ();
      ++bytesRead;
    }

  //
  // RF signal power at the antenna, decibel difference from an arbitrary, fixed
  // reference.
  //
  if (m_present & RADIOTAP_DBM_ANTSIGNAL) // bit 5
    {
      m_antennaSignal = start.ReadU8 ();
      ++bytesRead;
    }

  //
  // RF noise power at the antenna, decibel difference from an arbitrary, fixed
  // reference.
  //
  if (m_present & RADIOTAP_DBM_ANTNOISE) // bit 6
    {
      m_antennaNoise = start.ReadU8 ();
      ++bytesRead;
    }

  //
  // Quality of Barker code lock.
  //
  if (m_present & RADIOTAP_LOCK_QUALITY) // bit 7
    {
      //not yet implemented
      start.ReadU16 ();
      bytesRead += 2;
    }

  //
  // Transmit power expressed as unitless distance from max power
  // set at factory calibration (0 is max power).
  //
  if (m_present & RADIOTAP_TX_ATTENUATION) // bit 8
    {
      //not yet implemented
      start.ReadU16 ();
      bytesRead += 2;
    }

  //
  // Transmit power expressed as decibel distance from max power
  // set at factory calibration (0 is max power).
  //
  if (m_present & RADIOTAP_DB_TX_ATTENUATION) // bit 9
    {
      //not yet implemented
      start.ReadU16 ();
      bytesRead += 2;
    }

  //
  // Transmit power expressed as dBm (decibels from a 1 milliwatt reference).
  // This is the absolute power level measured at the antenna port.
  //
  if (m_present & RADIOTAP_DBM_TX_POWER) // bit 10
    {
      //not yet implemented
      start.ReadU8 ();
      ++bytesRead;
    }

  //
  // Unitless indication of the Rx/Tx antenna for this packet.
  // The first antenna is antenna 0.
  //
  if (m_present & RADIOTAP_ANTENNA) // bit 11
    {
      //not yet implemented
      start.ReadU8 ();
      ++bytesRead;
    }

  //
  // RF signal power at the antenna (decibel difference from an arbitrary fixed reference).
  //
  if (m_present & RADIOTAP_DB_ANTSIGNAL) // bit 12
    {
      //not yet implemented
      start.ReadU8 ();
      ++bytesRead;
    }

  //
  // RF noise power at the antenna (decibel difference from an arbitrary fixed reference).
  //
  if (m_present & RADIOTAP_DB_ANTNOISE) // bit 13
    {
      //not yet implemented
      start.ReadU8 ();
      ++bytesRead;
    }

  //
  // Properties of received frames.
  //
  if (m_present & RADIOTAP_RX_FLAGS) // bit 14
    {
      //not yet implemented
      start.ReadU16 ();
      bytesRead += 2;
    }

  //
  // MCS field.
  //
  if (m_present & RADIOTAP_MCS) // bit 19
    {
      m_mcsKnown = start.ReadU8 ();
      m_mcsFlags = start.ReadU8 ();
      m_mcsRate = start.ReadU8 ();
      bytesRead += 3;
    }

  //
  // A-MPDU Status, information about the received or transmitted A-MPDU.
  //
  if (m_present & RADIOTAP_AMPDU_STATUS) // bit 20
    {
      m_ampduStatusPad = ((4 - bytesRead % 4) % 4);
      start.Next (m_ampduStatusPad);
      m_ampduStatusRef = start.ReadU32 ();
      m_ampduStatusFlags = start.ReadU16 ();
      m_ampduStatusCRC = start.ReadU8 ();
      start.ReadU8 ();
      bytesRead += (8 + m_ampduStatusPad);
    }

  //
  // Information about the received or transmitted VHT frame.
  //
  if (m_present & RADIOTAP_VHT) // bit 21
    {
      m_vhtPad = ((2 - bytesRead % 2) % 2);
      start.Next (m_vhtPad);
      m_vhtKnown = start.ReadU16 ();
      m_vhtFlags = start.ReadU8 ();
      m_vhtBandwidth = start.ReadU8 ();
      for (uint8_t i = 0; i < 4; i++)
        {
          m_vhtMcsNss[i] = start.ReadU8 ();
        }
      m_vhtCoding = start.ReadU8 ();
      m_vhtGroupId = start.ReadU8 ();
      m_vhtPartialAid = start.ReadU16 ();
      bytesRead += (12 + m_vhtPad);
    }

  NS_ASSERT_MSG (m_length == bytesRead, "RadiotapHeader::Deserialize(): expected and actual lengths inconsistent");
  return bytesRead;
}

void
RadiotapHeader::Print (std::ostream &os) const
{
  NS_LOG_FUNCTION (this << &os);
  os << " tsft=" << m_tsft
     << " flags=" << std::hex << m_flags << std::dec
     << " rate=" << (uint16_t) m_rate
     << " freq=" << m_channelFreq
     << " chflags=" << std::hex << (uint32_t)m_channelFlags << std::dec
     << " signal=" << (int16_t) m_antennaSignal
     << " noise=" << (int16_t) m_antennaNoise
     << " mcsKnown=" << m_mcsKnown
     << " mcsFlags=" << m_mcsFlags
     << " mcsRate=" << m_mcsRate
     << " ampduStatusFlags=" << (int16_t) m_ampduStatusFlags
     << " vhtKnown=" << m_vhtKnown
     << " vhtFlags=" << m_vhtFlags
     << " vhtBandwidth=" << m_vhtBandwidth
     << " vhtMcsNss for user 1=" << m_vhtMcsNss[0]
     << " vhtMcsNss for user 2=" << m_vhtMcsNss[1]
     << " vhtMcsNss for user 3=" << m_vhtMcsNss[2]
     << " vhtMcsNss for user 4=" << m_vhtMcsNss[3]
     << " vhtCoding=" << m_vhtCoding
     << " vhtGroupId=" << m_vhtGroupId
     << " vhtPartialAid=" << m_vhtPartialAid;
}

void
RadiotapHeader::SetTsft (uint64_t value)
{
  NS_LOG_FUNCTION (this << value);
  m_tsft = value;

  if (!(m_present & RADIOTAP_TSFT))
    {
      m_present |= RADIOTAP_TSFT;
      m_length += 8;
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint64_t
RadiotapHeader::GetTsft () const
{
  NS_LOG_FUNCTION (this);
  return m_tsft;
}

void
RadiotapHeader::SetFrameFlags (uint8_t flags)
{
  NS_LOG_FUNCTION (this << static_cast<uint32_t> (flags));
  m_flags = flags;

  if (!(m_present & RADIOTAP_FLAGS))
    {
      m_present |= RADIOTAP_FLAGS;
      m_length += 1;
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint8_t
RadiotapHeader::GetFrameFlags (void) const
{
  NS_LOG_FUNCTION (this);
  return m_flags;
}

void
RadiotapHeader::SetRate (uint8_t rate)
{
  NS_LOG_FUNCTION (this << static_cast<uint32_t> (rate));
  m_rate = rate;

  if (!(m_present & RADIOTAP_RATE))
    {
      m_present |= RADIOTAP_RATE;
      m_length += 1;
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint8_t
RadiotapHeader::GetRate (void) const
{
  NS_LOG_FUNCTION (this);
  return m_rate;
}

void
RadiotapHeader::SetChannelFrequencyAndFlags (uint16_t frequency, uint16_t flags)
{
  NS_LOG_FUNCTION (this << frequency << flags);
  m_channelFreq = frequency;
  m_channelFlags = flags;

  if (!(m_present & RADIOTAP_CHANNEL))
    {
      m_channelPad = ((2 - m_length % 2) % 2);
      m_present |= RADIOTAP_CHANNEL;
      m_length += (4 + m_channelPad);
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint16_t
RadiotapHeader::GetChannelFrequency (void) const
{
  NS_LOG_FUNCTION (this);
  return m_channelFreq;
}

uint16_t
RadiotapHeader::GetChannelFlags (void) const
{
  NS_LOG_FUNCTION (this);
  return m_channelFlags;
}

void
RadiotapHeader::SetAntennaSignalPower (double signal)
{
  NS_LOG_FUNCTION (this << signal);

  if (!(m_present & RADIOTAP_DBM_ANTSIGNAL))
    {
      m_present |= RADIOTAP_DBM_ANTSIGNAL;
      m_length += 1;
    }
  if (signal > 127)
    {
      m_antennaSignal = 127;
    }
  else if (signal < -128)
    {
      m_antennaSignal = -128;
    }
  else
    {
      m_antennaSignal = static_cast<int8_t> (floor (signal + 0.5));
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint8_t
RadiotapHeader::GetAntennaSignalPower (void) const
{
  NS_LOG_FUNCTION (this);
  return m_antennaSignal;
}

void
RadiotapHeader::SetAntennaNoisePower (double noise)
{
  NS_LOG_FUNCTION (this << noise);

  if (!(m_present & RADIOTAP_DBM_ANTNOISE))
    {
      m_present |= RADIOTAP_DBM_ANTNOISE;
      m_length += 1;
    }
  if (noise > 127.0)
    {
      m_antennaNoise = 127;
    }
  else if (noise < -128.0)
    {
      m_antennaNoise = -128;
    }
  else
    {
      m_antennaNoise = static_cast<int8_t> (floor (noise + 0.5));
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint8_t
RadiotapHeader::GetAntennaNoisePower (void) const
{
  NS_LOG_FUNCTION (this);
  return m_antennaNoise;
}

void
RadiotapHeader::SetMcsFields (uint8_t known, uint8_t flags, uint8_t mcs)
{
  NS_LOG_FUNCTION (this << known << flags << mcs);
  m_mcsKnown = known;
  m_mcsFlags = flags;
  m_mcsRate = mcs;
  if (!(m_present & RADIOTAP_MCS))
    {
      m_present |= RADIOTAP_MCS;
      m_length += 3;
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint8_t
RadiotapHeader::GetMcsKnown () const
{
  NS_LOG_FUNCTION (this);
  return m_mcsKnown;
}

uint8_t
RadiotapHeader::GetMcsFlags () const
{
  NS_LOG_FUNCTION (this);
  return m_mcsFlags;
}

uint8_t
RadiotapHeader::GetMcsRate () const
{
  NS_LOG_FUNCTION (this);
  return m_mcsRate;
}

void
RadiotapHeader::SetAmpduStatus (uint32_t referenceNumber, uint16_t flags, uint8_t crc)
{
  NS_LOG_FUNCTION (this << referenceNumber << flags);
  m_ampduStatusRef = referenceNumber;
  m_ampduStatusFlags = flags;
  m_ampduStatusCRC = crc;
  if (!(m_present & RADIOTAP_AMPDU_STATUS))
    {
      m_ampduStatusPad = ((4 - m_length % 4) % 4);
      m_present |= RADIOTAP_AMPDU_STATUS;
      m_length += (8 + m_ampduStatusPad);
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint32_t
RadiotapHeader::GetAmpduStatusRef () const
{
  NS_LOG_FUNCTION (this);
  return m_ampduStatusRef;
}

uint16_t
RadiotapHeader::GetAmpduStatusFlags () const
{
  NS_LOG_FUNCTION (this);
  return m_ampduStatusFlags;
}

void
RadiotapHeader::SetVhtFields (uint16_t known, uint8_t flags, uint8_t bandwidth, uint8_t mcs_nss[4], uint8_t coding, uint8_t group_id, uint16_t partial_aid)
{
  NS_LOG_FUNCTION (this << known << flags << mcs_nss[0] << mcs_nss[1] << mcs_nss[2] << mcs_nss[3] << coding << group_id << partial_aid);
  m_vhtKnown = known;
  m_vhtFlags = flags;
  m_vhtBandwidth = bandwidth;
  for (uint8_t i = 0; i < 4; i++)
    {
      m_vhtMcsNss[i] = mcs_nss[i];
    }
  m_vhtCoding = coding;
  m_vhtGroupId = group_id;
  m_vhtPartialAid = partial_aid;
  if (!(m_present & RADIOTAP_VHT))
    {
      m_vhtPad = ((2 - m_length % 2) % 2);
      m_present |= RADIOTAP_VHT;
      m_length += (12 + m_vhtPad);
    }

  NS_LOG_LOGIC (this << " m_length=" << m_length << " m_present=0x" << std::hex << m_present << std::dec);
}

uint16_t
RadiotapHeader::GetVhtKnown () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtKnown;
}

uint8_t
RadiotapHeader::GetVhtFlags () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtFlags;
}

uint8_t
RadiotapHeader::GetVhtBandwidth () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtBandwidth;
}

uint8_t
RadiotapHeader::GetVhtMcsNssUser1 () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtMcsNss[0];
}

uint8_t
RadiotapHeader::GetVhtMcsNssUser2 () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtMcsNss[1];
}

uint8_t
RadiotapHeader::GetVhtMcsNssUser3 () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtMcsNss[2];
}

uint8_t
RadiotapHeader::GetVhtMcsNssUser4 () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtMcsNss[3];
}

uint8_t
RadiotapHeader::GetVhtCoding () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtCoding;
}

uint8_t
RadiotapHeader::GetVhtGroupId () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtGroupId;
}

uint8_t
RadiotapHeader::GetVhtPartialAid () const
{
  NS_LOG_FUNCTION (this);
  return m_vhtPartialAid;
}

} // namespace ns3