/*
 * This file is part of the Owl Positioning System (OwlPS).
 * OwlPS is a project of the University of Franche-Comte
 * (Université de Franche-Comté), France.
 *
 * Copyright © Université de Franche-Comté 2007-2012.
 *
 * Corresponding author: Matteo Cypriani <mcy@lm7.fr>
 *
 ***********************************************************************
 *
 * This software is governed by the CeCILL license under French law and
 * abiding by the rules of distribution of free software. You can use,
 * modify and/or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL:
 * http://www.cecill.info
 *
 * As a counterpart to the access to the source code and rights to copy,
 * modify and redistribute granted by the license, users are provided
 * only with a limited warranty and the software's authors, the holder
 * of the economic rights, and the successive licensors have only
 * limited liability.
 *
 * In this respect, the user's attention is drawn to the risks
 * associated with loading, using, modifying and/or developing or
 * reproducing the software by the user in light of its specific status
 * of free software, that may mean that it is complicated to manipulate,
 * and that also therefore means that it is reserved for developers and
 * experienced professionals having in-depth computer knowledge. Users
 * are therefore encouraged to load and test the software's suitability
 * as regards their requirements in conditions enabling the security of
 * their systems and/or data to be ensured and, more generally, to use
 * and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 *
 ***********************************************************************
 *
 * This is the header file of libowlps-resultreader, the library that
 * provides functions to read results sent on UDP by OwlPS Positioner.
 *
 * See also 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 Positioner.
 * 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_