/*
 * GraphBuilderBenchmark.h
 *
 *  Created on: 04.12.2014
 *      Author: Marvin Ritter (marvin.ritter@gmail.com)
 */

#ifndef NETWORKIT_GRAPH_TEST_GRAPH_BUILDER_BENCHMARK_HPP_
#define NETWORKIT_GRAPH_TEST_GRAPH_BUILDER_BENCHMARK_HPP_

#include <gtest/gtest.h>
#include <functional>
#include <networkit/auxiliary/Timer.hpp>

namespace NetworKit {

class GTestBenchmark : public testing::Test {
public:
    static void measureInMs(std::function<int()> func, int iterations = 1) {
        Aux::Timer timer;
        std::vector<unsigned long long> runningTimes(iterations);
        for (int i = 0; i < iterations; i++) {
            printf("Iteration %d of %d ...", i + 1, iterations);
            
            timer.start();
            int x = func();
            timer.stop();

            runningTimes[i] = timer.elapsedMilliseconds();

            printf("done (took %llu ms, result: %d).\n", runningTimes[i], x);
        }

        long long unsigned sum = 0;
        long long unsigned min = runningTimes[0];
        long long unsigned max = runningTimes[0];
        for (auto t : runningTimes) {
            sum += t;
            if (t < min) min = t;
            if (t > max) max = t;
        }

        printf("Iterations: %d, average runtime: %1.1f ms, fastest run: %llu ms, slowest run: %llu ms\n", iterations, (double) sum / iterations, min, max);
    }

    template <typename L>
    uint64_t timeOnce(L f) {
        // TODO should be moved somewhere else (Benchmark parent class or the Timer class itself)
        Aux::Timer timer;
        timer.start();
        f();
        timer.stop();
        return timer.elapsedMilliseconds();
    }
};

class GraphBuilderBenchmark : public GTestBenchmark {
public:
    GraphBuilderBenchmark() = default;
};

} /* namespace NetworKit */

#endif // NETWORKIT_GRAPH_TEST_GRAPH_BUILDER_BENCHMARK_HPP_
