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#ifndef QPERFORMANCELOG_H
#define QPERFORMANCELOG_H

#include <QtCore/qdatetime.h>

QT_BEGIN_NAMESPACE

namespace QPerformanceLog
{
    Q_DECLARATIVE_EXPORT void displayData();
    Q_DECLARATIVE_EXPORT void clear();

#ifdef Q_ENABLE_PERFORMANCE_LOG
    struct LogData {
        LogData(const char *);
        QTime timer;
        int sumTime;
        unsigned int *data;
    };

    struct LogMetric {
        LogMetric(LogData *, int, const char *);
    };

    // Internal
    void displayData(LogData *);
    void clear(LogData *);
#endif
}

#ifdef Q_ENABLE_PERFORMANCE_LOG

#define Q_DECLARE_PERFORMANCE_METRIC(name) \
    enum { name = ValueChoice<0, ValueTracker<0, __LINE__>::value, __LINE__>::value };  \
    template<int L> \
    struct ValueTracker<name, L> \
    { \
        enum { value = name }; \
    }; \
    extern QPerformanceLog::LogMetric metric ## name; 

#define Q_DECLARE_PERFORMANCE_LOG(name) \
    namespace name { \
        extern QPerformanceLog::LogData log; \
        inline void displayData() { QPerformanceLog::displayData(&log); } \
        inline void clear() { QPerformanceLog::clear(&log); } \
    } \
    template<int N> \
    class name ## Timer { \
    public: \
            name ## Timer() { \
                lastSum = name::log.sumTime + name::log.timer.restart(); \
                name::log.sumTime = 0; \
            } \
            ~ name ## Timer() { \
                name::log.data[2 * N] += name::log.sumTime + name::log.timer.restart(); \
                ++name::log.data[2 * N + 1]; \
                name::log.sumTime = lastSum; \
            } \
    private: \
             int lastSum; \
    }; \
    namespace name { \
        template<int N, int L> \
        struct ValueTracker \
        { \
            enum { value = -1 }; \
        }; \
        template<int DefNextValue, int NextValue, int L> \
        struct ValueChoice \
        { \
            enum { value = ValueChoice<DefNextValue + 1, ValueTracker<DefNextValue + 1, L>::value, L>::value }; \
        }; \
        template<int DefNextValue, int L> \
        struct ValueChoice<DefNextValue, -1, L> \
        { \
            enum { value = DefNextValue }; \
        }; \
    } \
    namespace name 

#define Q_DEFINE_PERFORMANCE_LOG(name, desc) \
    QPerformanceLog::LogData name::log(desc); \
    namespace name 

#define Q_DEFINE_PERFORMANCE_METRIC(name, desc) \
    QPerformanceLog::LogMetric metrix ## name(&log, name, desc); 

#else // Q_ENABLE_PERFORMANCE_LOG

#define Q_DECLARE_PERFORMANCE_METRIC(name)
#define Q_DECLARE_PERFORMANCE_LOG(name) namespace name
#define Q_DEFINE_PERFORMANCE_LOG(name, desc) namespace name
#define Q_DEFINE_PERFORMANCE_METRIC(name, desc) 

#endif // Q_ENABLE_PERFORMANCE_LOG

QT_END_NAMESPACE

#endif // QPERFORMANCELOG_H