/*
 * This library provides functions to read results sent on UDP by OwlPS
 * Positioning.
 * See the example program owlps-resultreader-udp.c.
 */

#ifndef _LIBOWLPS_RESULTREADER_CSV_
#define _LIBOWLPS_RESULTREADER_CSV_

#include <owlps.h>

#include <stdio.h>
#include <inttypes.h>


/* Maximum size of a result CSV string sent by OwlPS Positioning.
 * Request's information:
 *   MAC, request type (2 chars), timestamp, ';'
 * Plus, for each algorithm:
 *   Name, three coordinates, error (we assume the same size as the
 *   coordinates), area name, ';'
 * Let's define OWL_NB_ALGORITHMS as the number of implemented
 * algorithms (this is ugly).
 */
#define OWL_NB_ALGORITHMS 10
#define OWL_CSV_RESULT_REQUEST_STRLEN \
  (OWL_ETHER_ADDR_STRLEN + OWL_TIMESTAMP_STRLEN + 3)
#define OWL_CSV_ALGORITHM_RESULT_STRLEN \
  (OWL_ALGORITHM_STRLEN + 4 * OWL_COORDINATE_STRLEN + \
   OWL_AREA_STRLEN + 1)
#define OWL_CSV_RESULT_STRLEN \
  (OWL_CSV_RESULT_REQUEST_STRLEN + \
   OWL_NB_ALGORITHMS * OWL_CSV_ALGORITHM_RESULT_STRLEN + 1)

/* Same thing, but for the simplified CSV strings created by
 * *_to_csv_simple().
 * Request's information is only the MAC address.
 * For the algorithm:
 *  = 12 characters per coordinate + OWL_AREA_STRLEN
 */
#define OWL_CSV_RESULT_REQUEST_SIMPLE_STRLEN OWL_ETHER_ADDR_STRLEN
#define OWL_CSV_ALGORITHM_RESULT_SIMPLE_STRLEN \
  (3 * OWL_COORDINATE_STRLEN + OWL_AREA_STRLEN + 1)
#define OWL_CSV_RESULT_SIMPLE_STRLEN \
  (OWL_CSV_RESULT_REQUEST_SIMPLE_STRLEN + \
   OWL_NB_ALGORITHMS * OWL_CSV_ALGORITHM_RESULT_SIMPLE_STRLEN + 1)


/* Linked list of algorithms' results.
 * Each structure is the result of a single algorithm.
 */
typedef struct _owl_algorithm_result
{
  char *algorithm ;
  float x ;
  float y ;
  float z ;
  float error ;
  char *area ;

  struct _owl_algorithm_result *next ;
} owl_algorithm_result ;


/* Results for a request. Includes the request's data, and the
 * list of algorithms' results.
 */
typedef struct _owl_result
{
  char *mobile_mac_addr ;
  uint8_t request_type ;
  owl_timestamp mobile_timestamp ;
  unsigned int nb_results ;
  owl_algorithm_result *results ;
} owl_result ;


owl_result* owl_receive_position(int sockfd) ;
owl_result* owl_fill_result(char *csv) ;
owl_algorithm_result* owl_fill_algorithm_result(char **csv) ;

void owl_result_to_csv(char dst[OWL_CSV_RESULT_STRLEN],
                       const owl_result *const src) ;
void
owl_algorithm_result_to_csv(char dst[OWL_CSV_ALGORITHM_RESULT_STRLEN],
                            const owl_algorithm_result *const src) ;
void owl_result_to_csv_simple(char dst[OWL_CSV_RESULT_SIMPLE_STRLEN],
                              const owl_result *const src) ;
void owl_algorithm_result_to_csv_simple
(char dst[OWL_CSV_ALGORITHM_RESULT_SIMPLE_STRLEN],
 const owl_algorithm_result *const src) ;

void owl_fprint_result(FILE *stream, const owl_result *const src) ;
void owl_fprint_algorithm_result(FILE *stream,
                                 const owl_algorithm_result *const src) ;
#define owl_print_result(SRC) \
  (owl_fprint_result(stdout, (SRC)))
#define owl_print_algorithm_result(SRC) \
  (owl_fprint_algorithm_result(stdout, (SRC)))

void owl_free_result(owl_result *result) ;
void owl_free_algorithm_result(owl_algorithm_result *algo) ;


#endif // _LIBOWLPS_RESULTREADER_CSV_