/*
 * This file is part of the rtap localisation project.
 */

#ifndef _OWLPS_AGGREGATOR_H_
#define _OWLPS_AGGREGATOR_H_

#include "../../libowlps/owlps.h"
#include <confuse.h>

#define DEBUG

// Uncomment to output the timestamp on each line of the output file:
//#define TIMESTAMP


/* Arguments & program configuration */
#define OPTIONS "Aa:c:f:hi:k:l:o:p:t:" // getopt string
#define DEFAULT_CONFIG_FILE "/usr/local/etc/owlps/owlps-aggregator.conf"
#define DEFAULT_AGGREGATE_TIMEOUT 1500 // milliseconds
#define DEFAULT_KEEP_TIMEOUT 3000 // milliseconds
#define DEFAULT_CHECK_INTERVAL 500000 // microseconds
#define POSITIONER_DEFAULT_IP "127.0.0.1"


/* Error codes */
#define ERR_NO_MESSAGE_RECEIVED 1 // Error when reading the socket
#define ERR_CREATING_SOCKET 2 // Erreur when creating listening socket
#define ERR_BAD_USAGE 3 // Bad program call
#define ERR_PARSING_CONFIG_FILE 4 // Error reading the configuration file


/* Linked list storing data of couples MAC / sequence number */
typedef struct _couple_info_list
{
  // MAC address of the data sender (in bytes):
  unsigned char ap_mac_addr_bytes[6] ;
  // Signal strength received by the AP from the mobile:
  unsigned char antenna_signal_dbm ;
  struct _couple_info_list *next ;
} couple_info_list ;


/* Linked list of the couples MAC / sequence number */
typedef struct _couple_list
{
  /* Numéro de séquence de la demande de localisation du mobile */
  unsigned char mobile_mac_addr_bytes[6] ; // Mobile MAC address (in bytes)
  struct timeval request_time ; // Request time on the mobile

  /* Calibration data */
  float x_position ;
  float y_position ;
  float z_position ;
  DIRECTION direction ; // Request orientation

  /* Other data */
  // Arrival time of the first packet of the couple on the aggregator:
  struct timeval start_time ;
  couple_info_list *info ; // Data for this couple

  struct _couple_list *next ;
} couple_list ;


/* Linked list of the known APs */
typedef struct _ap_list
{
  unsigned char mac_address_bytes[6] ;
  struct timeval last_seen ;

  struct _ap_list *previous ;
  struct _ap_list *next ;
} ap_list ;


/* Function headers */
void initialise_configuration(int argc, char **argv) ;
void parse_config_file(int argc, char **argv) ;
void parse_command_line(int argc, char **argv) ;
void check_configuration(void) ;

int read_loop(int sockfd) ;
void got_couple_info(couple_message message) ;

void* monitor_couples(void) ;
void free_couple_list(void) ;
#ifdef DEBUG
void print_couple_list(void) ;
void print_couple_info(couple_info_list *info) ;
#endif // DEBUG

void listen_for_aps(void) ;
void update_ap(unsigned char mac_address_bytes[6]) ;
ap_list* find_ap(unsigned char mac_address_bytes[6]) ;
void add_ap_front(unsigned char mac_address_bytes[6]) ;
void update_ap_seen(ap_list *ap) ;
void push_ap(ap_list *ap) ;

void monitor_aps(void) ;
void delete_old_aps(void) ;
void delete_ap(ap_list *ap) ;
void unlink_ap(ap_list *ap) ;
void order_send(ap_list *ap) ;
void move_ap_front(ap_list *ap) ;
void free_ap_list(void) ;

char* ip_bytes_to_string(unsigned char *ip_binary) ;
void print_usage(void) ;

#endif // _OWLPS_AGGREGATOR_H_