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

/*

 * Copyright (c) 2005,2006 INRIA

 *

 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "ns3/packet.h"

#include "ns3/llc-snap-header.h"

#include "ns3/node.h"

#include "wifi-net-device.h"

#include "wifi-phy.h"

#include "wifi-channel.h"

#include "mac-stations.h"

#include "mac-low.h"

#include "mac-parameters.h"

#include "mac-rx-middle.h"

#include "mac-tx-middle.h"

#include "mac-high-adhoc.h"

#include "mac-high-nqsta.h"

#include "mac-high-nqap.h"

#include "dca-txop.h"

#include "wifi-default-parameters.h"

#include "arf-mac-stations.h"

#include "aarf-mac-stations.h"

#include "ideal-mac-stations.h"

#include "cr-mac-stations.h"

namespace ns3 {

static WifiMode 

GetWifiModeForPhyMode (WifiPhy *phy, enum WifiDefaultParameters::PhyModeParameter mode)

{

  uint32_t phyRate = (uint32_t)mode;

  for (uint32_t i= 0; i < phy->GetNModes (); i++)

    {

      WifiMode mode = phy->GetMode (i);

      if (mode.GetPhyRate () == phyRate)

        {

          return mode;

        }

    }

  NS_ASSERT (false);

  return WifiMode ();

}

WifiNetDevice::WifiNetDevice (Ptr<Node> node)

  : NetDevice (node, Mac48Address::Allocate ())

{

  SetMtu (2300);

  EnableBroadcast (Mac48Address ("ff:ff:ff:ff:ff:ff"));

  Construct ();

}

WifiNetDevice::~WifiNetDevice ()

{

  delete m_phy;

  delete m_stations;

  delete m_low;

  delete m_parameters;

  delete m_txMiddle;

  delete m_rxMiddle;

}

void

WifiNetDevice::Construct (void)

{

  // the physical layer.

  m_phy = new WifiPhy (this);

  // the rate control algorithm

  switch (WifiDefaultParameters::GetRateControlAlgorithm ()) {

  case WifiDefaultParameters::ARF:

    m_stations = new ArfMacStations (m_phy->GetMode (0));

    break;

  case WifiDefaultParameters::AARF:

    m_stations = new AarfMacStations (m_phy->GetMode (0));

    break;

  case WifiDefaultParameters::CONSTANT_RATE: {

    WifiMode dataRate = GetWifiModeForPhyMode (m_phy, WifiDefaultParameters::GetConstantDataRate ());

    WifiMode ctlRate = GetWifiModeForPhyMode (m_phy, WifiDefaultParameters::GetConstantCtlRate ());

    m_stations = new CrMacStations (dataRate, ctlRate);

  } break;

  case WifiDefaultParameters::IDEAL: {

    double ber = WifiDefaultParameters::GetIdealRateControlBer ();

    IdealMacStations *ideal = new IdealMacStations (m_phy->GetMode (0));

    uint32_t nModes = m_phy->GetNModes ();

    for (uint32_t i = 0; i < nModes; i++) 

      {

        WifiMode mode = m_phy->GetMode (i);

        ideal->AddModeSnrThreshold (mode, m_phy->CalculateSnr (mode, ber));

      }

    m_stations = ideal;

  } break;

  default:

    // NOTREACHED

    NS_ASSERT (false);

    break;

  }

  // MacParameters

  MacParameters *parameters = new MacParameters ();

  WifiMacHeader hdr;

  hdr.SetType (WIFI_MAC_CTL_CTS);

  Time ctsDelay = m_phy->CalculateTxDuration (hdr.GetSize () + 4, m_phy->GetMode (0), WIFI_PREAMBLE_LONG);

  hdr.SetType (WIFI_MAC_CTL_ACK);

  Time ackDelay = m_phy->CalculateTxDuration (hdr.GetSize () + 4, m_phy->GetMode (0), WIFI_PREAMBLE_LONG);

  parameters->Initialize (ctsDelay, ackDelay);

  m_parameters = parameters;

  // the MacLow

  MacLow *low = new MacLow ();

  low->SetDevice (this);

  low->SetPhy (m_phy);

  low->SetStations (m_stations);

  low->SetParameters (m_parameters);

  m_phy->SetReceiveOkCallback (MakeCallback (&MacLow::ReceiveOk, low));

  m_phy->SetReceiveErrorCallback (MakeCallback (&MacLow::ReceiveError, low));

  m_low = low;

  // the 'middle' rx

  MacRxMiddle *rxMiddle = new MacRxMiddle ();

  low->SetRxCallback (MakeCallback (&MacRxMiddle::Receive, rxMiddle));

  m_rxMiddle = rxMiddle;

  // the 'middle' tx

  MacTxMiddle *txMiddle = new MacTxMiddle ();

  m_txMiddle = txMiddle;

}

DcaTxop *

WifiNetDevice::CreateDca (uint32_t minCw, uint32_t maxCw) const

{

  DcaTxop *dca = new DcaTxop (minCw, maxCw);

  dca->SetParameters (m_parameters);

  dca->SetTxMiddle (m_txMiddle);

  dca->SetLow (m_low);

  dca->SetPhy (m_phy);

  Time difs = m_parameters->GetSifs () + 

    m_parameters->GetSlotTime () + 

    m_parameters->GetSlotTime ();

  // see 802.11 p85 section 9.2.10

  Time eifs = difs + m_parameters->GetSifs () + 

    m_phy->CalculateTxDuration (8 * (2+2+6+4), m_phy->GetMode (0), WIFI_PREAMBLE_LONG);

  dca->SetDifs (difs);

  dca->SetEifs (eifs);

  dca->SetMaxQueueSize (400);

  dca->SetMaxQueueDelay (Seconds (10));

  return dca;

}

void 

WifiNetDevice::ConnectTo (Ptr<WifiChannel> channel)

{

  m_channel = channel;

  m_phy->SetChannel (channel);

  NotifyConnected ();

}

bool

WifiNetDevice::SendTo (const Packet &packet, const Address &to, uint16_t protocolNumber)

{

  NS_ASSERT (Mac48Address::IsMatchingType (to));

  Mac48Address realTo = Mac48Address::ConvertFrom (to);

  Packet p = packet;

  LlcSnapHeader llc;

  llc.SetType (protocolNumber);

  p.AddHeader (llc);

  m_txLogger (p, realTo);

  return DoSendTo (p, realTo);

}

void 

WifiNetDevice::DoForwardUp (Packet packet, const Mac48Address &from)

{

  m_rxLogger (packet, from);

  LlcSnapHeader llc;

  packet.RemoveHeader (llc);

  NetDevice::ForwardUp (packet, llc.GetType (), from);

}

Mac48Address 

WifiNetDevice::GetSelfAddress (void) const

{

  NS_ASSERT (Mac48Address::IsMatchingType (GetAddress ()));

  Mac48Address self = Mac48Address::ConvertFrom (GetAddress ());

  return self;

}

bool 

WifiNetDevice::DoNeedsArp (void) const

{

  return true;

}

Ptr<Channel> 

WifiNetDevice::DoGetChannel (void) const

{

  return m_channel;

}

/*****************************************************

 *            Adhoc code

 *****************************************************/

AdhocWifiNetDevice::AdhocWifiNetDevice (Ptr<Node> node)

  : WifiNetDevice (node)

{

  m_ssid = WifiDefaultParameters::GetSsid ();

  m_dca = CreateDca (15, 1023);

  MacHighAdhoc *high = new MacHighAdhoc ();

  high->SetDevice (this);

  high->SetDcaTxop (m_dca);

  high->SetForwardCallback (MakeCallback (&AdhocWifiNetDevice::DoForwardUp, 

                                          static_cast<WifiNetDevice *> (this)));

  m_rxMiddle->SetForwardCallback (MakeCallback (&MacHighAdhoc::Receive, high));

  m_high = high;

}

AdhocWifiNetDevice::~AdhocWifiNetDevice ()

{

  delete m_dca;

  delete m_high;

}

Mac48Address 

AdhocWifiNetDevice::GetBssid (void) const

{

  return m_high->GetBssid ();

}

Ssid 

AdhocWifiNetDevice::GetSsid (void) const

{

  return m_ssid;

}

void 

AdhocWifiNetDevice::SetSsid (Ssid ssid)

{

  // XXX restart adhoc network join.

  m_ssid = ssid;

}

bool

AdhocWifiNetDevice::DoSendTo (const Packet &packet, Mac48Address const &to)

{

  m_high->Enqueue (packet, to);

  return true;

}

void

AdhocWifiNetDevice::NotifyConnected (void)

{

  NotifyLinkUp ();

}

/*****************************************************

 *            STA code

 *****************************************************/

NqstaWifiNetDevice::NqstaWifiNetDevice (Ptr<Node> node)

  : WifiNetDevice (node)

{

  m_ssid = WifiDefaultParameters::GetSsid ();

  m_dca = CreateDca (15, 1023);

  SupportedRates rates;

  for (uint32_t i = 0; i < m_phy->GetNModes (); i++) 

    {

      WifiMode mode = m_phy->GetMode (i);

      rates.AddSupportedRate (mode.GetPhyRate ());

    }

  MacHighNqsta *high = new MacHighNqsta ();

  high->SetDevice (this);

  high->SetDcaTxop (m_dca);

  high->SetForwardCallback (MakeCallback (&NqstaWifiNetDevice::DoForwardUp, 

                                          this));

  high->SetAssociatedCallback (MakeCallback (&NqstaWifiNetDevice::Associated, 

                                             this));

  high->SetDisAssociatedCallback (MakeCallback (&NqstaWifiNetDevice::DisAssociated, 

                                                this));

  high->SetSupportedRates (rates);

  m_rxMiddle->SetForwardCallback (MakeCallback (&MacHighNqsta::Receive, high));

  m_high = high;

}

NqstaWifiNetDevice::~NqstaWifiNetDevice ()

{

  delete m_dca;

  delete m_high;

}

Mac48Address 

NqstaWifiNetDevice::GetBssid (void) const

{

  return m_high->GetBssid ();

}

Ssid 

NqstaWifiNetDevice::GetSsid (void) const

{

  return m_ssid;

}

void 

NqstaWifiNetDevice::StartActiveAssociation (Ssid ssid)

{

  m_ssid = ssid;

  m_high->StartActiveAssociation ();

}

bool

NqstaWifiNetDevice::DoSendTo (const Packet &packet, Mac48Address const &to)

{

  m_high->Queue (packet, to);

  return true;

}

void

NqstaWifiNetDevice::NotifyConnected (void)

{

  // do nothing because link status is kept track of in

  // ::Associated and ::Disassociated

}

void 

NqstaWifiNetDevice::Associated (void)

{

  NetDevice::NotifyLinkUp ();

}

void 

NqstaWifiNetDevice::DisAssociated (void)

{

  NetDevice::NotifyLinkDown ();

}

/*****************************************************

 *            AP code

 *****************************************************/

NqapWifiNetDevice::NqapWifiNetDevice (Ptr<Node> node)

  : WifiNetDevice (node)

{

  m_ssid = WifiDefaultParameters::GetSsid ();

  m_dca = CreateDca (15, 1023);

  SupportedRates rates;

  for (uint32_t i = 0; i < m_phy->GetNModes (); i++) 

    {

      rates.AddSupportedRate (m_phy->GetMode (i).GetPhyRate ());

    }

  MacHighNqap *high = new MacHighNqap ();

  high->SetDevice (this);

  high->SetDcaTxop (m_dca);

  high->SetStations (m_stations);

  high->SetForwardCallback (MakeCallback (&NqapWifiNetDevice::DoForwardUp, 

                                          this));

  high->SetSupportedRates (rates);

  m_rxMiddle->SetForwardCallback (MakeCallback (&MacHighNqap::Receive, high));

  m_high = high;

}

NqapWifiNetDevice::~NqapWifiNetDevice ()

{

  delete m_dca;

  delete m_high;

}

Mac48Address 

NqapWifiNetDevice::GetBssid (void) const

{

  return GetSelfAddress ();

}

Ssid 

NqapWifiNetDevice::GetSsid (void) const

{

  return m_ssid;

}

void 

NqapWifiNetDevice::SetSsid (Ssid ssid)

{

  m_ssid = ssid;

}

bool

NqapWifiNetDevice::DoSendTo (const Packet &packet, Mac48Address const & to)

{

  m_high->Queue (packet, to);

  return true;

}

void

NqapWifiNetDevice::NotifyConnected (void)

{

  NotifyLinkUp ();

}

} // namespace ns3