Logging.h

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/*************************************************************************
> File Name: Logging.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: Super simple logger implementation.
> Created Time: 2017/04/23
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_LOGGER_H
#define CUBBYFLOW_LOGGER_H

#include <sstream>

namespace CubbyFlow
{
    enum class LogLevel : uint8_t
    {
        All = 0,
        Debug = 1,
        Info = 2,
        Warn = 3,
        Error = 4,
        Off = 5
    };

    class Logger final
    {
    public:
        explicit Logger(LogLevel level);

        ~Logger();

        template <typename T>
        const Logger& operator<<(const T& x) const
        {
            m_buffer << x;
            return *this;
        }

    private:
        LogLevel m_level;
        mutable std::stringstream m_buffer;
    };

    class Logging
    {
    public:
        static void SetInfoStream(std::ostream* stream);

        static void SetWarnStream(std::ostream* stream);

        static void SetErrorStream(std::ostream* stream);

        static void SetDebugStream(std::ostream* stream);

        static void SetAllStream(std::ostream* stream);

        static std::string GetHeader(LogLevel level);

        static void SetLevel(LogLevel level);

        static void Mute();

        static void Unmute();
    };

    extern Logger infoLogger;

    extern Logger warnLogger;

    extern Logger errorLogger;

    extern Logger debugLogger;

    #define CUBBYFLOW_INFO \
        (Logger(LogLevel::Info) << Logging::GetHeader(LogLevel::Info) \
         << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
    #define CUBBYFLOW_WARN \
        (Logger(LogLevel::Warn) << Logging::GetHeader(LogLevel::Warn) \
         << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
    #define CUBBYFLOW_ERROR \
        (Logger(LogLevel::Error) << Logging::GetHeader(LogLevel::Error) \
         << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
    #define CUBBYFLOW_DEBUG \
        (Logger(LogLevel::Debug) << Logging::GetHeader(LogLevel::Debug) \
         << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
}

#endif