#include "FluidSim/Fluid.hpp"
#include <barrier>
#include <chrono>
#include <iostream>
#include <thread>
using namespace fluidsim::port;
int main() {
    for (auto size : {std::pair{6, 10}, std::pair{64, 256}}) {
        const int steps = 1000;
        for (int workers : {1, 2, 4}) {
            std::vector<Pipe1D> p;
            for (int i = 0; i < size.first; i++)
                p.emplace_back(.001f, 2, size.second);
            auto advance = [&](int worker) {
                for (int k = worker; k < size.first; k += workers) {
                    auto &a = p[k];
                    auto l = a.state(0), r = a.state(size.second - 1);
                    l.velocity = -l.velocity;
                    r.velocity = -r.velocity;
                    a.left_ghost = l;
                    a.right_ghost = r;
                    a.advance(.0000005f);
                }
            };
            std::barrier sync(workers + 1);
            std::vector<std::jthread> pool;
            if (workers > 1)
                for (int k = 0; k < workers; k++)
                    pool.emplace_back([&, k] {
                        for (int i = 0; i < steps; i++) {
                            sync.arrive_and_wait();
                            advance(k);
                            sync.arrive_and_wait();
                        }
                    });
            auto start = std::chrono::steady_clock::now();
            for (int i = 0; i < steps; i++) {
                if (workers == 1)
                    advance(0);
                else {
                    sync.arrive_and_wait();
                    sync.arrive_and_wait();
                }
            }
            double sec = std::chrono::duration<double>(std::chrono::steady_clock::now() - start).count();
            pool.clear();
            double sum = 0;
            for (auto &q : p)
                sum += q.state(0).pressure;
            std::cout << "pipes=" << size.first << " cells/pipe=" << size.second << " workers=" << workers
                      << " steps=" << steps << " seconds=" << sec << " checksum=" << sum << '\n';
        }
    }
}