//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include <memory>
#include <thread>
#include <chrono>
#include <mutex>
#include <condition_variable>
#include <set>

#include "manager.h"
#include "function.h"
#include "record.h"
#include "utils/helpers.h"

namespace TM {
class Scheduler {
public:
    using Delay = std::chrono::milliseconds;
    using Time = Record::Time;
    using Task = Record::Task;

    Scheduler (std::weak_ptr<Manager> manager);
    ~Scheduler ();

    void start ();
    void stop ();
    Record::ID schedule (const Task& task, Delay delay);
    bool cancel (Record::ID id);

    static const Record::ID none;

private:
    void loop ();

private:
    PriorityQueue<
        Record,
        std::vector<Record>,
        std::greater<>
    > queue;
    std::set<Record::ID> scheduled;
    std::weak_ptr<Manager> manager;
    std::mutex mutex;
    std::condition_variable cond;
    std::unique_ptr<std::thread> thread;
    bool running;
    Record::ID idCounter;
};
}