/*!
 * \file      base_time.hh
 * \brief     Header file for the control port base_time functionality.
 * \author    ETSI STF525
 * \copyright ETSI Copyright Notification
 *            No part may be reproduced except as authorized by written permission.
 *            The copyright and the foregoing restriction extend to reproduction in all media.
 *            All rights reserved.
 * \version   0.1
 */
#pragma once

#include <chrono>

/**
 * \class base_time
 * \brief This class provides time tools such as getting current time
 */
class base_time {
  const unsigned long long its_base_time_ms = 1072915200000L; //! Base time 01/01/2004 12:00am in millseconds
  
  static base_time* _instance;
private:
  base_time() { }; //! Can not be created manually
public:
  static inline base_time& get_instance();

  virtual ~base_time() { if (_instance != nullptr) delete _instance; };
  
public:
  inline const unsigned long long get_current_time_ms() const;
  inline const unsigned long long get_its_base_time_ms() const;
  inline const unsigned long long get_its_current_time_ms() const;
  inline const unsigned long long get_its_current_time_us() const;
  inline const unsigned long long get_its_current_time_mod_ms() const;
}; // End of class base_time

// static functions
base_time& base_time::get_instance() {
  return (_instance != nullptr) ? *_instance : *(_instance = new base_time());
}

const unsigned long long base_time::get_current_time_ms() const {
  return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
}

const unsigned long long base_time::get_its_base_time_ms() const {
  return base_time::its_base_time_ms;
}

const unsigned long long base_time::get_its_current_time_ms() const {
  return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count() - base_time::its_base_time_ms;
}

const unsigned long long base_time::get_its_current_time_us() const {
  return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count() - base_time::its_base_time_ms * 1000;
}

const unsigned long long base_time::get_its_current_time_mod_ms() const {
  return (std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count() - base_time::its_base_time_ms) % 65536;
}