/****************************************************************************
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** Copyright (C) 2018 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Pelagicore Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
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** General Public License version 3 as published by the Free Software
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** ensure the GNU Lesser General Public License version 3 requirements
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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 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
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** SPDX-License-Identifier: LGPL-3.0
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****************************************************************************/

#pragma once

#include <QObject>
#include <QPair>
#include <QVector>
#include <QtAppManCommon/global.h>

QT_BEGIN_NAMESPACE_AM

class AbstractContainer;
class AbstractRuntime;
class CpuReader;

class QuickLauncher : public QObject
{
    Q_OBJECT

public:
    static QuickLauncher *instance();
    ~QuickLauncher() override;

    void initialize(int runtimesPerContainer, qreal idleLoad = 0);

    QPair<AbstractContainer *, AbstractRuntime *> take(const QString &containerId, const QString &runtimeId);

    void shutDown();

public slots:
    void rebuild();

signals:
    void shutDownFinished();

protected:
    void timerEvent(QTimerEvent *te) override;

private:
    QuickLauncher(QObject *parent = nullptr);
    QuickLauncher(const QuickLauncher &);
    QuickLauncher &operator=(const QuickLauncher &);
    static QuickLauncher *s_instance;

    void triggerRebuild(int delay = 0);
    void removeEntry(AbstractContainer *container, AbstractRuntime *runtime);

    struct QuickLaunchEntry
    {
        QString m_containerId;
        QString m_runtimeId;
        int m_maximum = 1;
        QList<QPair<AbstractContainer *, AbstractRuntime *>> m_containersAndRuntimes;
    };

    QVector<QuickLaunchEntry> m_quickLaunchPool;
    int m_idleTimerId = 0;
    CpuReader *m_idleCpu = nullptr;
    bool m_isIdle = false;
    qreal m_idleThreshold;
    bool m_shuttingDown = false;
};

QT_END_NAMESPACE_AM