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

/*

 * Copyright (c) 2007,2008 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: Jahanzeb Farooq <jahanzeb.farooq@sophia.inria.fr>

 */

/* BS outbound scheduler as per in Section 6.3.5.1 */

#ifndef BS_SCHEDULER_H

#define BS_SCHEDULER_H

#include <list>

#include "ns3/packet.h"

#include "wimax-phy.h"

#include "packet-burst.h"

#include "dl-mac-messages.h"

#include "service-flow.h"

namespace ns3 {

class BaseStationNetDevice;

class GenericMacHeader;

class WimaxConnection;

class Cid;

class BSScheduler : public Object

{

public:

  BSScheduler ();

  BSScheduler (Ptr<BaseStationNetDevice> bs);

  ~BSScheduler (void);

  static TypeId GetTypeId (void);

  /*

   * \brief This function returns all the downlink bursts scheduled for the next

   * downlink sub-frame

   * \returns  all the downlink bursts scheduled for the next downlink sub-frame

   */

  virtual std::list<std::pair<OfdmDlMapIe*, Ptr<PacketBurst> > >*

  GetDownlinkBursts (void) const = 0;

  /*

   * \brief This function adds a downlink burst to the list of downlink bursts

   * \param connection a pointer to connection in wich the burst will be sent

   * \param modulationType the modulation type of the burst

   */

  virtual void AddDownlinkBurst (Ptr<const WimaxConnection> connection,

                                 uint8_t diuc,

                                 WimaxPhy::ModulationType modulationType,

                                 Ptr<PacketBurst> burst) = 0;

  /*

   * \brief the scheduling function for the downlink subframe.

   */

  virtual void Schedule (void) = 0;

  /*

   * \brief Selects a connection from the list of connections having packets to be sent .

   * \param connection will point to a connection that have packets to be sent

   * \returns false if no connection has packets to be sent, true otherwise

   */

  virtual bool SelectConnection (Ptr<WimaxConnection> &connection) = 0;

  /*

   * \param serviceFlow the service flow of the burst

   * \param modulationType the modulation type to be used for the burst

   * \param availableSymbols maximum number of OFDM symbols to be used by the burst

   * \returns a Burst (list of packets)

   */

  virtual Ptr<PacketBurst> CreateUgsBurst (ServiceFlow *serviceFlow,

                                           WimaxPhy::ModulationType modulationType,

                                           uint32_t availableSymbols) = 0;

  virtual Ptr<BaseStationNetDevice> GetBs (void);

  virtual void SetBs (Ptr<BaseStationNetDevice> bs);

  /*

   * \brief Check if the packet fragmentation is possible for transport connection.

   * \param connection the downlink connection

   * \param availableSymbols maximum number of OFDM symbols to be used by the burst

   * \param modulationType the modulation type to be used for the burst

   * \returns false if packet fragmentation is not possible, true otherwise

   */

  bool CheckForFragmentation (Ptr<WimaxConnection> connection,

                              int availableSymbols,

                              WimaxPhy::ModulationType modulationType);

private:

  Ptr<BaseStationNetDevice> m_bs;

  std::list<std::pair<OfdmDlMapIe*, Ptr<PacketBurst> > > *m_downlinkBursts;

};

} // namespace ns3

#endif /* BS_SCHEDULER_H */