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

#ifndef _OWLPS_AGGREGATOR_H_
#define _OWLPS_AGGREGATOR_H_

#include <owlps.h>


/* Arguments & program configuration */
#define OPTIONS "a:Ac:C:f:hi:k:K:l:o:p:qt:vV" // 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 500 // milliseconds
#define DEFAULT_AP_KEEP_TIMEOUT 600 // seconds
#define DEFAULT_AP_CHECK_INTERVAL 1000 // milliseconds
#define POSITIONER_DEFAULT_IP "127.0.0.1"


/* Verbosity levels */
#define VERBOSE_QUIET cfg_getint(cfg, "verbose") == 0
#define VERBOSE_WARNING cfg_getint(cfg, "verbose") >= 1
#define VERBOSE_INFO cfg_getint(cfg, "verbose") >= 2
#define VERBOSE_CHATTERBOX cfg_getint(cfg, "verbose") >= 3
#define VERBOSE_REQUESTS cfg_getint(cfg, "verbose") >= 4


/* Linked list storing data of each request */
typedef struct _request_info_list
{
  // MAC address of the transmitter AP (in bytes):
  uint8_t ap_mac_addr_bytes[ETHER_ADDR_LEN] ;
  // Signal strength received by the AP from the mobile:
  uint8_t ss_dbm ;
  struct _request_info_list *next ;
} request_info_list ;


/* Linked list of the requests */
typedef struct _request_list
{
  uint8_t type ;

  /* Request identifier */
  // Mobile MAC address (in bytes):
  uint8_t mobile_mac_addr_bytes[ETHER_ADDR_LEN] ;
  owl_timestamp request_time ; // Request time on the mobile

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

  /* Other data */
  // Arrival time of the first packet of the request on the aggregator:
  owl_timestamp start_time ;
  request_info_list *info ; // Data for this request

  struct _request_list *next ;
} request_list ;


/* Linked list of the known APs */
typedef struct _ap_list
{
  uint8_t mac_addr_bytes[ETHER_ADDR_LEN] ;
  char ip_addr[INET_ADDRSTRLEN] ;

  owl_timestamp last_seen ;

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


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

int read_loop(int sockfd) ;
void got_request(owl_captured_request request) ;

void* monitor_requests(void *NULL_value) ;
void free_request_list(void) ;
#ifndef NDEBUG
void print_request_list(void) ;
void print_request_info(request_info_list *info) ;
#endif // NDEBUG

void* listen_for_aps(void *NULL_value) ;
void update_ap(uint8_t mac_addr_bytes[ETHER_ADDR_LEN],
               char ip_addr[INET_ADDRSTRLEN]) ;
ap_list* find_ap(uint8_t mac_addr_bytes[ETHER_ADDR_LEN]) ;
ap_list* add_ap_front(uint8_t mac_addr_bytes[ETHER_ADDR_LEN]) ;
void update_ap_ip_addr(ap_list *ap, char ip_addr[INET_ADDRSTRLEN]) ;
void update_ap_seen(ap_list *ap) ;
void push_ap(ap_list *ap) ;

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

void print_usage(void) ;
void print_version(void) ;

#endif // _OWLPS_AGGREGATOR_H_