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#include <vector>
#include <queue>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <future>
#include <functional>

class ThreadPool
{
public:
    ThreadPool(size_t);

    template <class F, class... Args>
    decltype(auto) add_task(F &&f, Args &&...args);

    ~ThreadPool();

    size_t get_task_count();

    size_t get_active_thread_count();

private:
    // need to keep track of threads so we can join them
    std::vector<std::thread> workers;
    // the task queue
    std::queue<std::function<void()>> tasks;

    // synchronization
    std::mutex queueMutex;
    std::condition_variable condition;
    bool stop;
};

// the constructor just launches some amount of workers
inline ThreadPool::ThreadPool(size_t threads)
    : stop(false)
{
    for (size_t i = 0; i < threads; ++i)
        workers.emplace_back(
            [this]
            {
                for (;;)
                {
                    std::function<void()> task;

                    {
                        std::unique_lock<std::mutex> lock(this->queueMutex);
                        this->condition.wait(lock,
                                             [this]
                                             { return this->stop || !this->tasks.empty(); });
                        if (this->stop && this->tasks.empty())
                            return;
                        task = std::move(this->tasks.front());
                        this->tasks.pop();
                    }

                    try
                    {
                        task();
                    }
                    catch (const std::exception &e)
                    {
                        // do nothing
                    }
                }
            });
}

// add new work item to the pool
template <class F, class... Args>
decltype(auto) ThreadPool::add_task(F &&f, Args &&...args)
{
    using return_type = decltype(f(args...));

    auto task = std::make_shared<std::packaged_task<return_type()>>(
        std::bind(std::forward<F>(f), std::forward<Args>(args)...));

    std::future<return_type> res = task->get_future();
    {
        std::unique_lock<std::mutex> lock(queueMutex);

        // don't allow enqueueing after stopping the pool
        if (stop)
            throw std::runtime_error("enqueue on stopped ThreadPool");

        tasks.emplace([task]()
                      { return (*task)(); });
    }
    condition.notify_one();
    return res;
}

// the destructor joins all threads
inline ThreadPool::~ThreadPool()
{
    {
        std::unique_lock<std::mutex> lock(queueMutex);
        stop = true;
    }
    condition.notify_all();
    for (std::thread &worker : workers)
        worker.join();
}

// the number of tasks currently in the thread pool.
inline size_t ThreadPool::get_task_count()
{
    std::unique_lock<std::mutex> lock(queueMutex);
    return tasks.size();
}

// the number of active threads in the thread pool.
inline size_t ThreadPool::get_active_thread_count()
{
    std::unique_lock<std::mutex> lock(queueMutex);
    return workers.size();
}