/*
 * This file is part of the Owl Positioning System (OwlPS).
 * OwlPS is a project of the University of Franche-Comté
 * (Université de Franche-Comté), France.
 */


#include "request.hh"
#include "mobile.hh"

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



/* *** Constructors *** */


/**
 * Note that the value pointed by #mobile is not deleted.
 */
Request::~Request()
{
  measurements.clear() ;
}



/* *** Write accessors *** */


inline void Request::clear_real_position()
{
  if (real_position)
    {
      delete real_position ;
      real_position = NULL ;
    }
}


void Request::set_real_position(const Point3D &_real_position)
{
  if (real_position)
    *real_position = _real_position ;
  else
    real_position = new Point3D(_real_position) ;
}


/**
 * - #nb_packets is set to 1 (this is the default value when
 *   constructing a Request).
 * - #mobile is NULLified, but the value it pointed to is not deleted.
 * - The fields of #time_sent are initialised to 0.
 * - #measurements is cleared.
 */
void Request::clear()
{
  type = OWL_REQUEST_UNDEFINED ;
  nb_packets = 1 ;
  mobile = NULL ;
  time_sent.clear() ;
  measurements.clear() ;
  clear_real_position() ;
}



/* *** Operations *** */


float Request::ss_square_distance(const Request &source) const
{
  unordered_map<string, Measurement>
    source_measurements(source.measurements),
    my_measurements(measurements) ;

  PosUtil::complete_with_dummy_measurements(
    my_measurements, source_measurements) ;

  return PosUtil::ss_square_distance(
           my_measurements, source_measurements) ;
}



/* *** Operators *** */


Request& Request::operator=(const Request &source)
{
  if (this == &source)
    return *this ;

  type = source.type ;
  nb_packets = source.nb_packets ;
  mobile = source.mobile ;
  time_sent = source.time_sent ;
  measurements = source.measurements ;

  clear_real_position() ;
  if (source.real_position)
    real_position = new Point3D(*source.real_position) ;

  return *this ;
}


bool Request::operator==(const Request &source) const
{
  if (this == &source)
    return true ;

  bool real_position_equal =
    real_position &&
    source.real_position &&
    *real_position == *source.real_position ;

  return
    real_position_equal &&
    type == source.type &&
    nb_packets == source.nb_packets &&
    mobile == source.mobile &&
    time_sent == source.time_sent &&
    measurements == source.measurements ;
}



ostream& operator<<(ostream &os, const Request &r)
{
  // Timestamp
  os << "At " << r.time_sent << "; " ;

  if (r.real_position)
    os << " Real coordinates : " << *r.real_position << "; " ;

  // MAC address
  os
      << "Type: " << static_cast<uint_fast16_t>(r.type)
      << ", Number of packets sent: " << r.nb_packets
      << ", Mobile: "
      << (r.mobile != NULL ? r.mobile->get_mac_addr() : "Unknown_Mobile")
      << ":" ;

  // List of Measurements
  if (r.measurements.empty())
    os << " No values" ;
  else
    for (unordered_map<string, Measurement>::const_iterator i
         = r.measurements.begin() ; i != r.measurements.end() ; ++i)
      os << '\n' << i->first << ": " << i->second ;

  return os ;
}



/**
 * The Mobile MAC address and the Timestamp are sufficient to identify
 * uniquely a Request.
 */
size_t hash_value(const Request &source)
{
  size_t seed = 0 ;

  boost::hash_combine(seed, source.type) ;
  boost::hash_combine(seed, source.nb_packets) ;
  boost::hash_combine(seed, source.time_sent) ;
  if (source.mobile)
    boost::hash_combine(seed, source.mobile->get_mac_addr()) ;
  if (source.real_position)
    boost::hash_combine(seed, source.real_position) ;

  return seed ;
}