/*!
 * \file      geonetworking_layer.hh
 * \brief     Header file for ITS GeoNetworking protocol layer.
 * \author    ETSI STF525
 * \copyright ETSI Copyright Notification
 *            No part may be reproduced except as authorized by written permission.
 *            The copyright and the foregoing restriction extend to reproduction in all media.
 *            All rights reserved.
 * \version   0.1
 */
#pragma once

#include <unistd.h>
#include <signal.h>
#include <time.h>

#include <mutex>

#include "t_layer.hh"
#include "geonetworking_codec.hh"
#include "location_table.hh"

class INTEGER;     //! Forward declaration of TITAN class
class OCTETSTRING; //! Forward declaration of TITAN class

namespace LibItsGeoNetworking__TestSystem {
  class GeoNetworkingPort; //! Forward declaration of TITAN class
  class GeoNetworkingReq;  //! Forward declaration of TITAN class
  class GeoNetworkingInd;  //! Forward declaration of TITAN class
}

namespace LibItsGeoNetworking__TypesAndValues {
  class BasicHeader;      //! Forward declaration of TITAN class
  class GeoNetworkingPdu; //! Forward declaration of TITAN class
  class BeaconHeader;     //! Forward declaration of TITAN class
  class LongPosVector;    //! Forward declaration of TITAN class
  class GN__Address;      //! Forward declaration of TITAN class
}

// TODO Change pointers into smart pointers
/*!
 * \class geonetworking_layer
 * \brief  This class provides description of ITS GeoNetworking protocol layer
 */
class geonetworking_layer : public t_layer<LibItsGeoNetworking__TestSystem::GeoNetworkingPort> {
  params _params;                                                       /*!< Layer parameters */
  geonetworking_codec _codec;                                            /*!< GeoNetworking codec object reference. \see geonetworking_codec */
  LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu* _beacon;       /*!< Data structure used for beaconing */
  LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu* _gbc_packet;   /*!< Data structure used to encapsulate upper layer PDU into a GeoNetworking packet as a Geobroadcast*/
  LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu* _shb_packet;   /*!< Data structure used to encapsulate upper layer PDU into a GeoNetworking packet as a SHB */
  LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu* _tsb_packet;   /*!< Data structure used to encapsulate upper layer PDU into a GeoNetworking packet as a TSB */
  LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu* _ls_reply;     /*!< Data structure used to reply to an incoming LS_REQUEST */
  location_table _location_table;                                        /*!< Location table, used when device_mode is set */
  location_table _pass_beacon_table;                                     /*!< Beaconing filter table */
  bool _device_mode;
  bool _secured_mode;
  bool _encrypted_mode;
  bool _enable_security_checks;
  std::mutex _sendData; // FIXME To be removed, useless
  timer_t _timerid;
  struct sigevent _sev;
  struct itimerspec _its;
  long long _freq_nanosecs;
  sigset_t _mask;
  struct sigaction _sa;
  unsigned int _sequence_number;
  int _latitude;
  int _longitude;
  
  /*!
   * \brief Create and initialize a BasicHeader object
   * \return A BasicHeader object
   */ 
  const LibItsGeoNetworking__TypesAndValues::BasicHeader fill_basic_header() const;
  /*!
   * \brief Initialize a beacon object for a stand alone beaconing
   *        This object could be replaced in case of start_beaconing call from the Adapter Control Port
   * \param[in] p_latitude
   * \param[in] p_longitude
   * \param[in] p_address
   */ 
  void fill_beacon(const OCTETSTRING& p_ll_address, const INTEGER p_station_type = 5, const INTEGER p_country = 0, const INTEGER type_of_address = 1);
  /*!
   * \brief Initialize a GeoNetworking packet to send GeoNetworking Facility messages
   *        This object shall be updated before to be sent
   * \param[in] p_latitude
   * \param[in] p_longitude
   * \param[in] p_address
   */ 
  void fill_gbc_packet(const OCTETSTRING& p_ll_address, const INTEGER& p_geoAreaPosLatitude, const INTEGER& p_geoAreaPosLongitude, const INTEGER& p_distanceA, const INTEGER& p_distanceB, const INTEGER& p_angle);
  /*!
   * \brief Initialize a GeoNetworking packet to send GeoNetworking Facility messages
   *        This object shall be updated before to be sent
   * \param[in] p_latitude
   * \param[in] p_longitude
   * \param[in] p_address
   */
  void fill_shb_packet(const OCTETSTRING& p_ll_address);
  /*!
   * \brief Initialize a GeoNetworking packet to send GeoNetworking Facility messages
   *        This object shall be updated before to be sent
   * \param[in] p_latitude
   * \param[in] p_longitude
   * \param[in] p_address
   * \param[in] p_hop_number
   * \param[in] p_max_hop_number
   */
  void fill_tsb_packet(const OCTETSTRING& p_ll_address, const int p_hop_number = 3, const int p_max_hop_limit = 5);
  /*!
   * \brief Initialize an LS_REPLY GeoNetworking packet to reply to an LS_REQUEST
   *        This object shall be updated before to be sent
   * \param[in] p_latitude
   * \param[in] p_longitude
   * \param[in] p_address
   */ 
  void fill_ls_reply(const OCTETSTRING& p_ll_address);
  
  static void timer_irq_sigalrm_handler(int p_signal, siginfo_t *p_signal_info, void *p_uc);

  const int _signal_id = SIGTERM;

public:
  explicit geonetworking_layer() : t_layer<LibItsGeoNetworking__TestSystem::GeoNetworkingPort>(), _params(), _codec(), _beacon(NULL), _gbc_packet(NULL), _shb_packet(nullptr), _ls_reply(nullptr), _location_table(), _pass_beacon_table(), _device_mode{false}, _sendData(), _timerid{0}, _sev{0}, _its{0}, _freq_nanosecs(0), _mask{0}, _sa{0}, _sequence_number{0} { };
  geonetworking_layer(const std::string& p_type, const std::string& p_param);
  virtual ~geonetworking_layer();
  
  /*!
   * \fn void sendMsg(const LibItsGeoNetworking__TestSystem::GeoNetworkingReq& p_gn_req, params& p_param);
   * \brief Send GeoNetworking message to the lower layers
   * \param[in] p_gn_req The GeoNetworking message to be sent
   * \param[in] p_params Some parameters to overwrite default value of the lower layers parameters
   */
  void sendMsg(const LibItsGeoNetworking__TestSystem::GeoNetworkingReq& p_gn_req, params& p_param);
  
  /*!
   * \virtual
   * \fn void send_data(OCTETSTRING& data, params& params);
   * \brief Send bytes formated data to the lower layers
   * \param[in] p_data The data to be sent
   * \param[in] p_params Some parameters to overwrite default value of the lower layers parameters
   */
  virtual void send_data(OCTETSTRING& data, params& params);
  /*!
   * \virtual
   * \fn void receive_data(OCTETSTRING& data, params& params);
   * \brief Receive bytes formated data from the lower layers
   * \param[in] p_data The bytes formated data received
   * \param[in] p_params Some lower layers parameters values when data was received
   */
  virtual void receive_data(OCTETSTRING& data, params& info);
  
  /*!
   * \virtual
   * \fn void send_data(OCTETSTRING& data, params& params);
   * \brief Send bytes formated data to the lower layers
   * \param[in] p_data The data to be sent
   * \param[in] p_params Some parameters to overwrite default value of the lower layers parameters
   */
  virtual OCTETSTRING trigger_ac_event(OCTETSTRING& data, params& params);

  const LibItsGeoNetworking__TypesAndValues::LongPosVector* get_lpv(const LibItsGeoNetworking__TypesAndValues::GN__Address& p_gn_address);
  void start_beaconing();
  void start_beaconing(const LibItsGeoNetworking__TypesAndValues::GeoNetworkingPdu& p_beacon);
  void stop_beaconing();
  void start_pass_beaconing(const LibItsGeoNetworking__TypesAndValues::BeaconHeader& p_beacon);
  void stop_pass_beaconing();
  
  int enable_secured_mode(const std::string& p_certificate_id, const boolean p_enforce_security = false);
  int disable_secured_mode();
  
private:
  void init(const std::string & p_type, const std::string & p_param);
  void send_beacon();
  int build_geonetworking_pdu(OCTETSTRING& data, params& params);
  int build_secured_pdu(OCTETSTRING& data, params& params);
  int decode_basic_header(const OCTETSTRING& p_data, LibItsGeoNetworking__TypesAndValues::BasicHeader& p_basic_header);
  int setup_secured_mode();
  
}; // End of class geonetworking_layer