/**
 * Google Cloud Platform credentials for DICOMweb and Orthanc
 * Copyright (C) 2019-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * In addition, as a special exception, the copyright holders of this
 * program give permission to link the code of its release with the
 * OpenSSL project's "OpenSSL" library (or with modified versions of it
 * that use the same license as the "OpenSSL" library), and distribute
 * the linked executables. You must obey the GNU General Public License
 * in all respects for all of the code used other than "OpenSSL". If you
 * modify file(s) with this exception, you may extend this exception to
 * your version of the file(s), but you are not obligated to do so. If
 * you do not wish to do so, delete this exception statement from your
 * version. If you delete this exception statement from all source files
 * in the program, then also delete it here.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "GoogleAccount.h"

#include <boost/thread.hpp>

class GoogleUpdater : public boost::noncopyable
{
private:
  enum State
  {
    State_Setup,
    State_Running,
    State_Done
  };

  static void Worker(const State* state,
                     const GoogleAccount* account,
                     long refreshIntervalSeconds);

  State                        state_;
  std::vector<boost::thread*>  workers_;

  // Singleton
  GoogleUpdater() :
    state_(State_Setup)
  {
  }

public:
  static GoogleUpdater& GetInstance()
  {
    static GoogleUpdater updater;
    return updater;
  }

  ~GoogleUpdater();

  void Start();
  
  void Stop();
};