Log.h

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#pragma once
 
#include <mutex>
#include <thread>
#include <string>
#include <fstream>
#include <iostream>
#include <ctime>
#include <queue>
#include <cstdio>
#include <cassert>
#include <cstdarg>
#include <atomic>
#include <condition_variable>
 
namespace dyno
{
    class Log
    {
    public:
        enum MessageType
        {
            DebugInfo, 
            Info,       
            Warning, 
            Error,     
            User,       
        };
 
        struct Message {
            MessageType type;
            std::string text;
            tm* when;
        };
 
        static Log* instance();
 

        static void sendMessage(MessageType type, const std::string& text);

        static void setUserReceiver(void (*userFunc)(const Message&));

        static void setLevel(MessageType level);

        static void setOutput(const std::string& filename);

        static const std::string& getOutput();
 
    private:
 
        Log();
        ~Log();
 
        void outputThread();
 
        //Add a new message to log
        void writeMessage(MessageType level, const char* format, ...);
 
    private:
        bool mRunning;
 
        std::mutex mtx;
        std::thread mThread;
        std::condition_variable mCondition;
 
        static std::atomic<Log*> sLogInstance;
 
        static std::queue<Message> sMessageQueue;
        static MessageType sLogLevel;
        static std::string sOutputFile;
        static std::ofstream sOutputStream;
        static void (*receiver)(const Message&);
    };
}