Helper.h

#ifndef HELPER_H
#define HELPER_H

#include <ctime>    // for mail-sending triggers etc
#include <string>
#include <sstream>  // to convert various types to strings in there
#include <fstream>  // for ofstream

namespace Helper
{   // prototypes of functions
    template <class T>
    // to convert pretty much anything to string
    std::string ToString(const T &);

    struct DateTime
    {
        DateTime()
        {
            time_t ms;
            time(&ms);

            struct tm *info = localtime(&ms);

            D = info->tm_mday;
            m = info->tm_mon + 1;   // because it starts from 1 e.g. January = 1
            y = 1900 + info->tm_year;
            M = info->tm_min;
            H = info->tm_hour;
            S = info->tm_sec;
        }
        DateTime(int D, int m, int y, int M, int H, int S) : D(D), m(m), y(y), M(M), H(H), S(S) {}
        DateTime(int D, int m, int y) : D(D), m(m), y(y), M(0), H(0), S(0) {}
        // const = it only reads and it's not changing anything within the class
        DateTime Now() const
        {
            return DateTime();
        }

        int D, m, y, M, H, S;

        std::string GetDateString() const
        {   // return a string like DD.mm.YYYY
            return std::string(D < 10 ? "0" : "") + ToString(D) +
                    std::string(m < 10 ? ".0" : ".") + ToString(m) +
                    "." + ToString(y);
        }
        std::string GetTimeString(const std::string &sep = ":") const
        {   // returns a string like HH:MM:SS
            return std::string(H < 10 ? "0" : "") + ToString(H) + sep +
                    std::string(M < 10 ? "0" : "") + ToString(M) + sep +
                    std::string(S < 10 ? sep : "") + ToString(S);
        }
        std::string GetDateTimeString(const std::string &sep = ":") const
        {
            return GetDateString() + " " + GetTimeString(sep);
        }
    };

    template <class T>

    std::string ToString(const T &e)
    {
        std::ostringstream s;//output class for string
        s << e;
        return s.str();
    }

    void WriteAppLog(const std::string &s)
    {
        std::ofstream file("AppLog.txt", std::ios::app);
        file << "[" << Helper::DateTime().GetDateTimeString() << "]" << "\n" << s << std::endl << "\n";
        file.close();
    }
}

#endif // HELPER_H