#pragma once
#include "sdk.h"
// boost.beast будет использовать std::string_view вместо boost::string_view
#define BOOST_BEAST_USE_STD_STRING_VIEW

#include <mutex>

#include "session.h"

namespace http_server
{
using namespace std;

class Logger
{
  mutex mtx_;
  ostream* stream_ptr_;

  Logger() = default;

 public:
  static Logger& GetInstance();

  void SetOutStream(ostream& stream);

  auto GetTimeStamp()
  {
    const auto now = std::chrono::system_clock::now();
    const auto t_c = std::chrono::system_clock::to_time_t(now);

    return std::put_time(std::localtime(&t_c), "%F %T");
  }

  template<class First, class... Args>
  void Log(First fst, Args... args)
  {
    lock_guard guard(mtx_);

    *stream_ptr_ << GetTimeStamp() << ": "s;

    LogImpl(fst, args...);
  }

 private:
  template<class First, class... Args>
  void LogImpl(First fst, Args... args)
  {
    *stream_ptr_ << fst;

    LogImpl(args...);
  }

  template<class First>
  void LogImpl(First fst)
  {
    *stream_ptr_ << fst << '\n';
  }
};
}  // namespace http_server