#include "measurement.hh"


using namespace std ;



/* *** Constructors *** */


Measurement::Measurement(const AccessPoint *_ap,
                         const vector<int> &_ss_list)
{
  ap = (AccessPoint *) _ap ;
  ss_list = _ss_list ;
  ss_list.reserve(10) ;
  update_average_ss() ;
}


Measurement::Measurement(const Measurement &m)
{
  ap = m.ap ;
  ss_list = m.ss_list ;
  average_ss = m.average_ss ;
}



/**
 * Note that values pointed by #ap are not deleted.
 */
Measurement::~Measurement()
{
  ss_list.clear() ;
}



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


void Measurement::update_average_ss()
{
  average_ss = 0 ;

  for (vector<int>::iterator i = ss_list.begin() ;
       i != ss_list.end() ; ++i)
    {
      float ss_mwatts =
        pow(10, (float) *i / 10.0) +
        (ss_list.size() * pow(10, average_ss / 10.0)) ;
      average_ss = 10 * log10(ss_mwatts / ss_list.size()) ;
    }
}


/**
 * #average_ss is updated to include the new value.
 */
void Measurement::add_ss(const int &ss)
{
  float ss_mwatts =
    pow(10, (float) ss / 10.0) +
    (ss_list.size() * pow(10, average_ss / 10.0)) ;
  ss_list.push_back(ss) ;
  average_ss = 10 * log10(ss_mwatts / ss_list.size()) ;
}


/**
 * update_average_ss() is automatically called to recalculate
 * #average_ss.
 */
void Measurement::set_ss_list(const std::vector<int> &_ss_list)
{
  ss_list = _ss_list ;
  update_average_ss() ;
}


/**
 * - #ap is not deleted, only initialised to NULL.
 * - #ss_list is cleared.
 * - #average_ss is initialised to 0.
 */
void Measurement::clear()
{
  ss_list.clear() ;
  average_ss = 0 ;
  ap = NULL ;
}



/* *** Operators *** */


const Measurement& Measurement::operator=(const Measurement &m)
{
  if (this == &m)
    return *this ;

  ap = m.ap ;
  ss_list = m.ss_list ;
  average_ss = m.average_ss ;

  return *this ;
}


bool Measurement::operator==(const Measurement &m) const
{
  if (this == &m)
    return true ;

  return
    ap == m.ap &&
    ss_list == m.ss_list &&
    average_ss == m.average_ss ;
}



ostream &operator<<(ostream &os, const Measurement &m)
{
  // MAC address
  os
      << "AP: " << (m.ap != NULL ? m.ap->get_mac_addr() : "Unknown_AP")
      << ": " ;

  // List of SS
  if (m.ss_list.size() == 0)
    os << "No values" ;
  else
    for (vector<int>::const_iterator i = m.ss_list.begin() ;
         i != m.ss_list.end() ; ++i)
      {
        os << *i ;
        if (i != m.ss_list.end() - 1)
          os << ";" ;
      }
  os << " [AVG=" << m.average_ss << "]" ;

  return os ;
}