/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/Function.h>
#include <LibCore/Object.h>

namespace Core {

class Timer final : public Object {
    C_OBJECT(Timer);

public:
    static NonnullRefPtr<Timer> create_single_shot(int interval, Function<void()>&& timeout_handler, Object* parent = nullptr)
    {
        auto timer = adopt(*new Timer(interval, move(timeout_handler), parent));
        timer->set_single_shot(true);
        timer->stop();
        return timer;
    }

    virtual ~Timer() override;

    void start();
    void start(int interval);
    void restart();
    void restart(int interval);
    void stop();

    bool is_active() const { return m_active; }
    int interval() const { return m_interval; }
    void set_interval(int interval)
    {
        if (m_interval == interval)
            return;
        m_interval = interval;
        m_interval_dirty = true;
    }

    bool is_single_shot() const { return m_single_shot; }
    void set_single_shot(bool single_shot) { m_single_shot = single_shot; }

    Function<void()> on_timeout;

private:
    explicit Timer(Object* parent = nullptr);
    Timer(int interval, Function<void()>&& timeout_handler, Object* parent = nullptr);

    virtual void timer_event(TimerEvent&) override;

    bool m_active { false };
    bool m_single_shot { false };
    bool m_interval_dirty { false };
    int m_interval { 0 };
};

}