Logger.h

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#pragma once
 
#include <fstream>
#include <sstream>
#include <thread>
#include <ctime>
#include <chrono>
#include <iomanip>
#include <filesystem>
 
namespace Systemic::Internal
{
    class Logger
    {
    public:
        static void Log(const std::string& str)
        {
            static std::ofstream myfile(std::filesystem::temp_directory_path().append("systemic_log.txt").native());
 
            std::ostringstream ss;
            time_in_HH_MM_SS_MMM(ss);
            ss << "[" << std::this_thread::get_id() << "]" << ": " << str << "\n";
            myfile << ss.str();
            myfile.flush();
        }
 
    private:
        static void time_in_HH_MM_SS_MMM(std::ostream& out)
        {
            using namespace std::chrono;
 
            // get current time
            auto now = system_clock::now();
 
            // get number of milliseconds for the current second
            // (remainder after division into seconds)
            auto ms = duration_cast<milliseconds>(now.time_since_epoch()) % 1000;
 
            // convert to std::time_t in order to convert to std::tm (broken time)
            auto timer = system_clock::to_time_t(now);
 
            // convert to broken time
            std::tm bt;
            ::localtime_s(&bt, &timer);
 
            // save default formatting
            std::ios init(nullptr);
            init.copyfmt(out);
 
            out << std::put_time(&bt, "%H:%M:%S"); // HH:MM:SS
            out << '.' << std::setfill('0') << std::setw(3) << ms.count() << std::setw(3);
 
            // restore default formatting
            out.copyfmt(init);
        }
    };
}