sched.h

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/*
Copyright (c) 2026 MrXie1109
 
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/
 
#pragma once
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <thread>
#include <vector>
 
#include "../util/time.h"
 
namespace console {
    class Scheduler {
        std::mutex              mut; 
        std::condition_variable cv;  
        std::atomic<bool>       canceled{
            false}; 
        std::vector<std::thread> threads; 
 
    public:
        template <class Rep, class Period, class Func>
        void schedule(
            const std::chrono::duration<Rep, Period> &duration, Func &&func) {
            std::thread(
                [this](std::chrono::duration<Rep, Period> duration, Func func) {
                    auto deadline = std::chrono::steady_clock::now() + duration;
                    std::unique_lock<std::mutex> lock(mut);
                    bool interrupted = cv.wait_until(lock, deadline, [this] {
                        return canceled.load(std::memory_order_acquire);
                    });
                    if (!interrupted) {
                        lock.unlock();
                        func();
                    }
                },
                duration,
                std::forward<Func>(func))
                .detach();
        }

        template <class Func>
        void schedule(Time duration, Func &&func) {
            schedule(std::chrono::nanoseconds(duration.count()),
                std::forward<Func>(func));
        }

        template <class Func>
        void schedule(double seconds, Func &&func) {
            schedule(std::chrono::duration_cast<std::chrono::nanoseconds>(
                         std::chrono::duration<double>(seconds)),
                std::forward<Func>(func));
        }

        template <class Rep, class Period, class Func>
        void interval(
            const std::chrono::duration<Rep, Period> &duration, Func &&func) {
            mut.lock();
            threads.push_back(std::thread(
                [this](std::chrono::duration<Rep, Period> duration, Func func) {
                    std::unique_lock<std::mutex> lock(mut, std::adopt_lock);
                    auto deadline = std::chrono::steady_clock::now();
                    while (true) {
                        deadline += duration;
                        bool interrupted = cv.wait_until(
                            lock, deadline, [this] {
                                return canceled.load(std::memory_order_acquire);
                            });
                        if (interrupted) break;
                        lock.unlock();
                        func();
                        lock.lock();
                    }
                },
                duration,
                std::forward<Func>(func)));
        }

        template <class Func>
        void interval(Time duration, Func &&func) {
            interval(std::chrono::nanoseconds(duration.count()),
                std::forward<Func>(func));
        }

        template <class Func>
        void interval(double seconds, Func &&func) {
            interval(std::chrono::duration_cast<std::chrono::nanoseconds>(
                         std::chrono::duration<double>(seconds)),
                std::forward<Func>(func));
        }

        void cancel_all() {
            canceled.store(true, std::memory_order_release);
            cv.notify_all();
        }

        ~Scheduler() {
            cancel_all();
            for (auto &thread : threads)
                if (thread.joinable()) thread.join();
        }
    };
}