FeatherMC/src/logging/Logger.h

#pragma once

namespace Feather::Logging
{
    const int MAX_LOG_MESSAGE_LENGTH = 2048;
    const int MAX_LOGGING_CHANNEL_COUNT = 256;

/*==== Severity Levels ==============================*/

    enum class Level
    {
        // Serious problems
        ERROR = -2,

        // Potential problems of note
        WARNING = -1,

        // General messages for end-users
        INFO = 0,

        // More advanced information for problem-solving
        DEBUG = 1,

        // Fine grained spew
        TRACE = 2,

        // These are an inclusve interval
        MIN_LEVEL = ERROR,
        MAX_LEVEL = TRACE,
    };

/*==== Channels ==============================*/

    typedef int ChannelID;

    class Channel
    {        
        const char* m_name;
    public:
        Channel(const char* name) : m_name(name) {}

        inline const char* GetName() { return m_name; }
    };

    extern ChannelID LOG_GENERAL;

/*==== Logger ==============================*/

    class Logger
    {
    public:
        Logger();
        void LogDirect(ChannelID channel, Level level, const char* message, ...);

        ChannelID RegisterChannel(const char* name);

    private:
        Channel* m_channels[MAX_LOGGING_CHANNEL_COUNT];
        ChannelID m_channelCount = 0;
    };

    extern Logger GlobalLogger;
}

#define REGISTER_LOGGING_CHANNEL(Name) Feather::Logging::GlobalLogger.RegisterChannel(Name);

// Logs a message, specifying a channel and log level
#define Log_Msg(_Channel, _Level, _Message, ...) Feather::Logging::GlobalLogger.LogDirect(Feather::Logging::_Channel, Feather::Logging::Level::_Level, _Message, ##__VA_ARGS__)

// Logs a general message for end-users
#define Log_Info(Message, ...) Log_Msg(LOG_GENERAL, INFO, Message, ##__VA_ARGS__)

// Logs a potential problem of note
#define Log_Warn(Message, ...) Log_Msg(LOG_GENERAL, WARNING, Message, ##__VA_ARGS__)

// Logs a serious problem
#define Log_Error(Message, ...) Log_Msg(LOG_GENERAL, ERROR, Message, ##__VA_ARGS__)

// Logs debug information for developers
#define Log_Debug(Message, ...) Log_Msg(LOG_GENERAL, DEBUG, Message, ##__VA_ARGS__)

// Logs fine grained debug information
#define Log_Trace(Message, ...) Log_Msg(LOG_GENERAL, TRACE, Message, ##__VA_ARGS__)