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// Taken from here: http://www.drdobbs.com/cpp/logging-in-c/201804215

// Original author: Petru Marginean <petru.marginean@gmail.com>

// Modified by: Czarek Tomczak <czarek.tomczak@gmail.com>

// Usage:

// LOG_DEBUG << "Browser: someVar = " << someVar;

// Warning:

// Log is written when ~Log() destructor is called, which

// occurs when outside of scope. This could result in log

// not being written if program crashes before code goes

// outside of current scope. You could embrace LOG_DEBUG

// statements with braces {} to guarantee the log to be

// written immediately.

#ifndef __LOG_H__

#define __LOG_H__

#include <sstream>

#include <string>

#include <stdio.h>

#include "DebugLog.h"

inline std::string NowTime();

enum TLogLevel {logERROR, logWARNING, logINFO, logDEBUG,

logDEBUG1, logDEBUG2, logDEBUG3, logDEBUG4};

template <typename T>

class Log

{

public:

Log();

virtual ~Log();

std::ostringstream& Get(TLogLevel level = logINFO);

public:

static TLogLevel& ReportingLevel();

static std::string ToString(TLogLevel level);

static TLogLevel FromString(const std::string& level);

protected:

std::ostringstream os;

private:

Log(const Log&);

Log& operator =(const Log&);

};

template <typename T>

Log<T>::Log()

{

}

template <typename T>

std::ostringstream& Log<T>::Get(TLogLevel level)

{

// os << "- " << NowTime();

// os << " " << ToString(level) << ": ";

// os << std::string(level > logDEBUG ? level - logDEBUG : 0, '\t');

return os;

}

template <typename T>

Log<T>::~Log()

{

os << std::endl;

if (T::Stream() != stderr) {

fprintf(stderr, "%s", os.str().c_str());

fflush(stderr);

}

T::Output(os.str());

DebugLog(os.str().c_str());

}

template <typename T>

TLogLevel& Log<T>::ReportingLevel()

{

static TLogLevel reportingLevel = logDEBUG4;

return reportingLevel;

}

template <typename T>

std::string Log<T>::ToString(TLogLevel level)

{

static const char* const buffer[] = {"ERROR", "WARNING", "INFO", "DEBUG",

"DEBUG1", "DEBUG2", "DEBUG3", "DEBUG4"};

return buffer[level];

}

template <typename T>

TLogLevel Log<T>::FromString(const std::string& level)

{

if (level == "DEBUG4")

return logDEBUG4;

if (level == "DEBUG3")

return logDEBUG3;

if (level == "DEBUG2")

return logDEBUG2;

if (level == "DEBUG1")

return logDEBUG1;

if (level == "DEBUG")

return logDEBUG;

if (level == "INFO")

return logINFO;

if (level == "WARNING")

return logWARNING;

if (level == "ERROR")

return logERROR;

Log<T>().Get(logWARNING) << "Unknown logging level '" << level

<< "'. Using INFO level as default.";

return logINFO;

}

class Output2FILE

{

public:

static FILE*& Stream();

static void Output(const std::string& msg);

};

inline FILE*& Output2FILE::Stream()

{

static FILE* pStream = stderr;

return pStream;

}

inline void Output2FILE::Output(const std::string& msg)

{

FILE* pStream = Stream();

if (!pStream)

return;

fprintf(pStream, "%s", msg.c_str());

fflush(pStream);

}

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)

# if defined (BUILDING_FILELOG_DLL)

# define FILELOG_DECLSPEC __declspec (dllexport)

# elif defined (USING_FILELOG_DLL)

# define FILELOG_DECLSPEC __declspec (dllimport)

# else

# define FILELOG_DECLSPEC

# endif // BUILDING_DBSIMPLE_DLL

#else

# define FILELOG_DECLSPEC

#endif // _WIN32

class FILELOG_DECLSPEC FILELog : public Log<Output2FILE> {};

//typedef Log<Output2FILE> FILELog;

#ifndef FILELOG_MAX_LEVEL

#define FILELOG_MAX_LEVEL logDEBUG4

#endif

#define LOG(level) \

if (level > FILELOG_MAX_LEVEL) ;\

else if (level > FILELog::ReportingLevel() || !Output2FILE::Stream()) ; \

else FILELog().Get(level) \

#define LOG_ERROR LOG(logERROR)

#define LOG_WARNING LOG(logWARNING)

#define LOG_INFO LOG(logINFO)

#define LOG_DEBUG LOG(logDEBUG)

#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)

#include <windows.h>

inline std::string NowTime()

{

const int MAX_LEN = 200;

char buffer[MAX_LEN];

if (GetTimeFormatA(LOCALE_USER_DEFAULT, 0, 0,

"HH':'mm':'ss", buffer, MAX_LEN) == 0)

return "Error in NowTime()";

char result[100] = {0};

static DWORD first = GetTickCount();

#pragma warning(suppress: 4996)

sprintf(result, "%s.%03ld", buffer, (long)(GetTickCount() - first) % 1000);

return result;

}

#else

#include <sys/time.h>

inline std::string NowTime()

{

char buffer[11];

time_t t;

time(&t);

tm r = {0};

strftime(buffer, sizeof(buffer), "%X", localtime_r(&t, &r));

struct timeval tv;

gettimeofday(&tv, 0);

char result[100] = {0};

sprintf(result, "%s.%03ld", buffer, (long)tv.tv_usec / 1000);

return result;

}

#endif //WIN32

#endif //__LOG_H__

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