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#pragma once

#include "log.h" 
#include "backend.h" 
#include "priority.h" 
 
#define YSYSLOG(priority, ...) SysLogInstance().AddLog((priority), __VA_ARGS__) 
#define YSYSLOGINIT_FLAGS(ident, facility, flags)                                                                                    \ 
    struct TLogIniter {                                                                                                              \ 
        TLogIniter() {                                                                                                               \ 
            SysLogInstance().ResetBackend(THolder<TLogBackend>(                                                                      \
                (ident) ? (TLogBackend*)(new TSysLogBackend((ident), (facility), (flags))) : (TLogBackend*)(new TNullLogBackend())));\
        }                                                                                                                            \ 
    } Y_CAT(loginit, __LINE__);

#define YSYSLOGINIT(ident, facility) YSYSLOGINIT_FLAGS((ident), (facility), 0) 

class TSysLogBackend: public TLogBackend {
public: 
    enum EFacility { 
        TSYSLOG_LOCAL0 = 0, 
        TSYSLOG_LOCAL1 = 1, 
        TSYSLOG_LOCAL2 = 2, 
        TSYSLOG_LOCAL3 = 3, 
        TSYSLOG_LOCAL4 = 4, 
        TSYSLOG_LOCAL5 = 5, 
        TSYSLOG_LOCAL6 = 6, 
        TSYSLOG_LOCAL7 = 7 
    }; 

    enum EFlags { 
        LogPerror = 1, 
        LogCons = 2 
    }; 

    TSysLogBackend(const char* ident, EFacility facility, int flags = 0); 
    ~TSysLogBackend() override; 

    void WriteData(const TLogRecord& rec) override; 
    void ReopenLog() override; 

    virtual TString GetIdent() const {
        return Ident; 
    } 

    virtual EFacility GetFacility() const { 
        return Facility; 
    } 

    virtual int GetFlags() const { 
        return Flags; 
    } 

protected: 
    int ELogPriority2SyslogPriority(ELogPriority priority);

    TString Ident;
    EFacility Facility; 
    int Flags; 
};

/* 
 * return system-wide logger instance 
 * better do not use in real programs(instead of robot, of course) 
 */ 
TLog& SysLogInstance();