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/* MIT License                                                                    */
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/* Copyright (c) 2020, 2021 JetBrains-Research                                    */
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#ifndef CUBOOL_TESTING_TIMER_HPP
#define CUBOOL_TESTING_TIMER_HPP

#include <chrono>

namespace testing {

    struct Timer {
    public:
        void start() {
            mStart = mEnd = clock::now();
        }

        void end() {
            mEnd = clock::now();
        }

        double getElapsedTimeMs() const {
            using namespace std::chrono;
            return (double) duration_cast<nanoseconds>(mEnd - mStart).count() / 1.0e6;
        }

    private:
        using clock = std::chrono::high_resolution_clock;
        using timepoint = clock::time_point;
        timepoint mStart;
        timepoint mEnd;
    };

    struct TimeQuery {
    public:
        void addTimeSample(double ms) {
            mSamplesCount += 1;
            mTimeSumMS += ms;
        }

        double getAverageTimeMs() const {
            return mTimeSumMS / (double) mSamplesCount;
        }

    private:
        double mTimeSumMS = 0.0f;
        int mSamplesCount = 0;
    };

    struct TimeScope {
    public:
        explicit TimeScope(TimeQuery &query) : mTimeQuery(query) {
            mTimer.start();
        }

        ~TimeScope() {
            mTimer.end();
            mTimeQuery.addTimeSample(mTimer.getElapsedTimeMs());
        }

    private:
        Timer mTimer;
        TimeQuery &mTimeQuery;
    };

}

#endif //CUBOOL_TESTING_TIMER_HPP
