// SPDX-FileCopyrightText: 2024 Yury Gubich <blue@macaw.me>
// SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include <set>
#include <map>
#include <functional>
#include <mutex>
#include <atomic>

#include <sys/select.h>

#include "shared/loggable.h"
#include "shared/logger.h"

class Loop : Shared::Loggable {
public:
    typedef std::function<void()> Callback;
    typedef std::map<int, Callback> Handlers;

    Loop(const Shared::Logger& logger);
    ~Loop();

    void run();
    void stop();
    void addDescriptor(int descriptor, const Callback& handler);
    void removeDescriptor(int descriptor);

private:
    void wake();
    bool drain(fd_set* readfds);
    bool runCallbacks(const Handlers& copy);

private:

    int wakePipe[2];
    Handlers handlers;
    std::mutex mutex;
    std::atomic<bool> running;

private:
    static void registerInstance(Loop* loop);
    static void unregisterInstance(Loop* loop);
    static void signalHandler(int signum);

    static inline std::set<Loop*> instances;
    static inline std::mutex instanceMutex;

};