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

#ifndef _OWLPS_AGGREGATOR_H_
#define _OWLPS_AGGREGATOR_H_

#include <owlps.h>

#include <confuse.h>

#define DEBUG

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


/* Arguments & program configuration */
#define OPTIONS "Aa:c:C:f:hi:k:K:l:o:p:t:v" // 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 DEFAULT_AP_KEEP_TIMEOUT 600 // s
#define DEFAULT_AP_CHECK_INTERVAL 1000 // ms
#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
#define ERR_SENDING_INFO 5 // Error sending a message on a socket
#define ERR_CREATING_THREAD 6 // Error creating a thread


/* Linked list storing data of each request */
typedef struct _request_info_list
{
  // MAC address of the data sender (in bytes):
  uint8_t ap_mac_addr_bytes[ETHER_ADDR_LEN] ;
  // Signal strength received by the AP from the mobile:
  uint8_t antenna_signal_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 */
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_request(owl_captured_request request) ;

void* monitor_requests(void *NULL_value) ;
void free_request_list(void) ;
#ifdef DEBUG
void print_request_list(void) ;
void print_request_info(request_info_list *info) ;
#endif // DEBUG

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) ;

#endif // _OWLPS_AGGREGATOR_H_