#include "Timer.hpp"

#include "Common.hpp"

#include <signal.h> // sigset_t
#include <time.h> // timer_t
#include <string.h> // strerror


struct sigaction& sigActionInit( struct sigaction &sigAct, const int signal )
{
  sigAct.sa_flags = SA_SIGINFO;
  sigemptyset( &sigAct.sa_mask );
  sigaddset( &sigAct.sa_mask, signal );
  sigaction( signal, &sigAct, 0 );
  return sigAct;
}


Timer::Timer( const Timer& timer )
    : m_signal( timer.m_signal )
    , m_sigAction( sigActionInit( m_sigAction , m_signal ) )
    , m_timerId( 0 )
    , m_periodic( false )
    , m_running( true )
{
  TRACE;
}


void Timer::createTimer( const time_t interval_sec,
                         const long interval_nsec,
                         const time_t initExpr_sec,
                         const long initExpr_nsec )
{
  TRACE;

  // create timer
  struct sigevent sigev;
  sigev.sigev_notify = SIGEV_SIGNAL;
  sigev.sigev_signo = m_signal;
  sigev.sigev_value.sival_ptr = &m_timerId;
  timer_create( CLOCK_MONOTONIC, &sigev, &m_timerId );

  // arm it
  struct itimerspec its;
  its.it_value.tv_sec = interval_sec;
  its.it_value.tv_nsec = interval_nsec;
  its.it_interval.tv_sec = initExpr_sec;
  its.it_interval.tv_nsec = initExpr_nsec;

  if ( initExpr_sec != 0 or initExpr_nsec != 0 ) m_periodic = true;
  timer_settime( m_timerId, 0, &its, 0 );
}


void Timer::wait()
{
  TRACE;

  int sig;
  sigwait( &m_sigAction.sa_mask, &sig );
  timerExpired();
  if ( m_periodic ) {
    while ( m_running ) {
      sigwait( &m_sigAction.sa_mask, &sig );
      periodicTimerExpired();
    }
  }
}


void Timer::stopTimer()
{
  TRACE;

  struct itimerspec its;
  its.it_value.tv_sec = 0;
  its.it_value.tv_nsec = 0;
  timer_settime( m_timerId, 0, &its, 0 );
  m_running = false;
}


void Timer::gracefulStop()
{
  TRACE;

  m_running = false;
}


Timer::Timer( const int signal )
    : m_signal( signal )
    , m_sigAction( sigActionInit( m_sigAction , m_signal ) )
    , m_timerId( 0 )
    , m_periodic( false )
    , m_running( true )
{
  TRACE;
}


Timer& Timer::operator=( const Timer& )
{
  TRACE;
  return *this;
}