logger.hpp

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#pragma once
 
#include <string>
#include <unordered_map>
#include <fstream>
 
#ifdef SOURCE_ROOT
    #define RELATIVE_FILE (__FILE__ + sizeof(SOURCE_ROOT) - 1)
#else
    #define RELATIVE_FILE __FILE__
#endif

#define LOG_INFO(msg) Engine::Core::Logger::Instance().Log(msg, Engine::Core::LogLevel::LOG_INFO, RELATIVE_FILE, __LINE__, __func__)
#define LOG_WARNING(msg) Engine::Core::Logger::Instance().Log(msg, Engine::Core::LogLevel::LOG_WARNING, RELATIVE_FILE, __LINE__, __func__)
#define LOG_ERROR(msg) Engine::Core::Logger::Instance().Log(msg, Engine::Core::LogLevel::LOG_ERROR, RELATIVE_FILE, __LINE__, __func__)
#define LOG_FATAL(msg) Engine::Core::Logger::Instance().Log(msg, Engine::Core::LogLevel::LOG_FATAL, RELATIVE_FILE, __LINE__, __func__)
#if defined(NDEBUG)
    #define LOG_DEBUG(msg) do {} while (0)
#else
    #define LOG_DEBUG(msg) Engine::Core::Logger::Instance().Log(msg, Engine::Core::LogLevel::LOG_DEBUG, RELATIVE_FILE, __LINE__, __func__)
#endif
 
namespace Engine::Core {
    enum class LogLevel {
        LOG_DEBUG,
        LOG_INFO,
        LOG_WARNING,
        LOG_ERROR,
        LOG_FATAL
    };

    class Logger {
        private:
            Logger();
            ~Logger();

            std::ofstream mLogFile;
 
        public:
            static Logger& Instance();
            void Log(const std::string& message, LogLevel level = LogLevel::LOG_INFO, const char *file = "", int line = 0, const char *func = "");

            std::ostream& Stream();
    };

    inline const char* LogLevelToString(LogLevel level) {
        switch (level) {
            case LogLevel::LOG_DEBUG: return "DEBUG";
            case LogLevel::LOG_INFO: return "INFO";
            case LogLevel::LOG_WARNING: return "WARNING";
            case LogLevel::LOG_ERROR: return "ERROR";
            case LogLevel::LOG_FATAL: return "FATAL";
            default: return "UNKNOWN";
        }
    }
}