#ifndef __LOG_H__
#define __LOG_H__

#include <sstream>
#include <string>
#include <stdio.h>
// #if defined TARGET_OS_MAC || defined __APPLE__
// #include <libiomp/omp.h> // parallelization options on mac
// #elif defined __linux__ || defined _WIN32 || defined _WIN64
// #include <omp.h> // parallelization options
// #endif

// inline std::string NowTime();

enum TLogLevel {logERROR, logWARNING, logINFO, logITERATION, 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)
{
	if (level >= logDEBUG) {
// 		os << NowTime() << " - ";
// 		os << "thread: " << omp_get_thread_num() << " - ";
	}
    os << ToString(level) << ": ";
    os << std::string(level > logDEBUG ? level - logDEBUG : 0, '\t');
    return os;
}

template <typename T>
Log<T>::~Log()
{
    os << std::endl;
    T::Output(os.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", "ITERATION", "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 == "ITERATION")
        return logITERATION;
    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 FILE_LOG(level) \
    if (level > FILELOG_MAX_LEVEL) ;\
    else if (level > FILELog::ReportingLevel() || !Output2FILE::Stream()) ; \
    else FILELog().Get(level)

// #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();
// //     std::sprintf(result, "%s.%03ld", buffer, (long)(GetTickCount() - first) % 1000); 
//     sprintf(result, "%s.%03ld", buffer, (long)(GetTickCount() - first) % 1000); // Compiling on windows complains about the std::
//     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), "%T", 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__