/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#pragma once

#include <functional>
#include <mutex>

namespace ClangBackEnd {

class ProgressCounter
{
public:
    using SetProgressCallback = std::function<void(int, int)>;
    using Lock = std::lock_guard<std::mutex>;

    ProgressCounter(SetProgressCallback &&progressCallback)
        : m_progressCallback(std::move(progressCallback))
    {}

    void addTotal(int total)
    {
        Lock lock(m_mutex);

        if (total) {
            m_total += total;

            m_progressCallback(m_progress, m_total);
        }
    }

    void removeTotal(int total)
    {
        Lock lock(m_mutex);

        if (total) {
            m_total -= total;

            sendProgress();
        }
    }

    void addProgress(int progress)
    {
        Lock lock(m_mutex);

        if (progress) {
            m_progress += progress;

            sendProgress();
        }
    }

    int total() const
    {
        Lock lock(m_mutex);

        return m_total;
    }

    int progress() const
    {
        Lock lock(m_mutex);

        return m_progress;
    }

private:
    void sendProgress()
    {
        m_progressCallback(m_progress, m_total);

        if (m_progress >= m_total) {
            m_progress = 0;
            m_total = 0;
        }
    }

private:
    mutable std::mutex m_mutex;
    std::function<void(int, int)> m_progressCallback;
    int m_progress = 0;
    int m_total = 0;
};

}