/*
 * 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:
 *  = 18 (MAC) + 2 (type) + 22 (timestamp) = 42 + ';' = 43
 * Plus, for each algorithm, about 60 characters (say 100, as the length
 * of the algorithm and area names can vary, 101 with the ';').
 * Let's keep room for 10 algorithms :
 *  10×101 + 43 = 1053 characters.
 */
#define OWL_CSV_RESULT_REQUEST_STRLEN 43
#define OWL_CSV_ALGORITHM_RESULT_STRLEN 101
#define OWL_CSV_RESULT_STRLEN 1053


/* 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 ;
  owl_algorithm_result *results ;
} owl_result ;


void owl_receive_position(int sockfd, owl_result **result) ;
void owl_fill_result(owl_result **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_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_