#pragma once

#include "base/exception.hpp"
#include "base/logging.hpp"

#include "std/chrono.hpp"
#include "std/condition_variable.hpp"
#include "std/mutex.hpp"
#include "std/shared_ptr.hpp"
#include "std/string.hpp"
#include "std/thread.hpp"

namespace pugi
{
class xml_document;
}

namespace editor
{
class EditorConfigWrapper;

// Class for multithreaded interruptable waiting.
class Waiter
{
public:
  template <typename Rep, typename Period>
  bool Wait(duration<Rep, Period> const & waitDuration)
  {
    unique_lock<mutex> lock(m_mutex);

    if (m_interrupted)
      return false;

    m_event.wait_for(lock, waitDuration, [this]() { return m_interrupted; });

    return true;
  }

  void Interrupt();

private:
  bool m_interrupted = false;
  mutex m_mutex;
  condition_variable m_event;
};

// Class which loads config from local drive, checks hash
// for config on server and downloads new config if needed.
class ConfigLoader
{
public:
  explicit ConfigLoader(EditorConfigWrapper & config);
  ~ConfigLoader();

  // Static methods for production and testing.
  static void LoadFromLocal(pugi::xml_document & doc);
  static string GetRemoteHash();
  static void GetRemoteConfig(pugi::xml_document & doc);
  static bool SaveHash(string const & hash, string const & filePath);
  static string LoadHash(string const & filePath);

private:
  void LoadFromServer();
  bool SaveAndReload(pugi::xml_document const & doc);
  void ResetConfig(pugi::xml_document const & doc);

  EditorConfigWrapper & m_config;

  Waiter m_waiter;
  thread m_loaderThread;
};
}  // namespace editor