#include "exec.h"

#include <chrono>
#include <iostream>

using namespace std;
using namespace std::chrono;

void timeit(function<void()> f, string name) {
    auto begin = high_resolution_clock::now();

    f();

    auto after = high_resolution_clock::now();

    auto d = after - begin;
    decltype(d)::rep count = d.count();
    decltype(d)::period p;

    cout << name << " :: " << static_cast<double>(p.num)/p.den * count << endl;
}

void benchmarkit(function<void()> f, string name, function<void()> setup) {

    int n = 1;
    const double min_duration = 0.1;

    while (true) {
        setup();
     
        cout << "Running " << name << " for " << n << " iterations.\n";

        auto begin = high_resolution_clock::now();

        for (unsigned int i = 0; i < n; i += 1)
            f();

        auto end = high_resolution_clock::now();
        decltype(end-begin)::period p;
        auto seconds = (end-begin).count() * static_cast<double>(p.num)/p.den;
        if (seconds < min_duration) {
            n *= 2;
        } else {
            cout << n << " iterations took " << seconds << " seconds (" << seconds/n << " s/iter)\n";
            break;
        }
    }
}