/*
 * 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.
 *
 ***********************************************************************
 */


#include "inputcsv.hh"
#include "posutil.hh"
#include "posexcept.hh"
#include "stock.hh"
#include "calibrationrequest.hh"
#include "configuration.hh"

#include <iostream>
#include <boost/tr1/unordered_map.hpp>

using namespace std ;
using std::tr1::unordered_map ;



/* *** Operations *** */


/**
 * This function fills the current Request from the CSV input file.
 * Blank lines and lines containing only spaces are skipped until a line
 * containing a request is found.
 *
 * @returns \em true if #current_request was correctly filled.
 * @returns \em false in case of error (file not opened, end of file,
 * invalid field or wrong number of fields in the line).
 */
bool InputCSV::fill_current_request()
{
  if (! file.next_line()) // End of file or error
    return false ;
  ++current_line_nb ;

  // Read Mobile MAC field
  string mac_mobile ;
  if (! file.read_field(mac_mobile)) // Wrong number of fields
    {
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read mac_mobile.\n" ;
      return false ;
    }
  PosUtil::to_upper(mac_mobile) ;

  if (! Configuration::bool_value("positioning.accept-new-mobiles") &&
      ! Stock::mobile_exists(mac_mobile))
    return false ;

  const Mobile &mobile = Stock::find_create_mobile(mac_mobile) ;
  current_request->set_mobile(&mobile) ;

  // Read request type
  uint_fast8_t type ;
  uint_fast16_t type_r ;
  if (! file.read_field(type_r))
    {
      // Wrong number of fields
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read type.\n" ;
      return false ;
    }
  type = type_r ;
  current_request->set_type(type) ;

  // Read the number of packets
  uint_fast16_t nb_packets ;
  if (! file.read_field(nb_packets))
    {
      // Wrong number of fields
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read the number of packets.\n" ;
      return false ;
    }
  current_request->set_nb_packets(nb_packets) ;

  // Read Timestamp field
  Timestamp timestamp ;
  if (! file.read_timestamp(timestamp))
    {
      // Wrong number of fields
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read timestamp.\n" ;
      return false ;
    }
  current_request->set_time_sent(timestamp) ;

  // Read position fields
  Point3D position ;
  if (! file.read_point3d(position))
    {
      // Wrong number of fields
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read coordinates.\n" ;
      return false ;
    }

  // Read direction field
  Direction direction ;
  int direction_int ;
  if (! file.read_field(direction_int))
    {
      // Wrong number of fields
      if (Configuration::is_configured("verbose"))
        cerr << "InputCSV: cannot read direction.\n" ;
      return false ;
    }
  if (direction_int != 0)
    direction = direction_int ;

  // Reading all the {AP_MAC;Packet_ID;SS}
  unordered_map<string, Measurement> measurements ;

  string mac_ap ;
  while (file.read_field(mac_ap))
    {
      pkt_id_t packet_id ;
      if (! file.read_field(packet_id))
        {
          // Wrong number of fields
          if (Configuration::is_configured("verbose"))
            cerr << "InputCSV: cannot read the packet ID.\n" ;
          return false ;
        }

      int_fast16_t ss ;
      if (! file.read_field(ss))
        {
          // Wrong number of fields
          if (Configuration::is_configured("verbose"))
            cerr << "InputCSV: cannot read the signal strength.\n" ;
          return false ;
        }

      PosUtil::to_upper(mac_ap) ;
      if (! Configuration::bool_value("positioning.accept-new-aps") &&
          ! Stock::ap_exists(mac_ap))
        continue ;

      const AccessPoint &ap = Stock::find_create_ap(mac_ap) ;
      measurements[mac_ap].set_ap(&ap) ;
      measurements[mac_ap].add_ss(packet_id, ss) ;
    }
  if (measurements.empty())
    return false ;
  current_request->set_measurements(measurements) ;

  // Calibration request?
  fill_calibration_request_data(mac_mobile, position, direction, type) ;

  return true ;
}