/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** 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
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QT3DCORE_DEPENDENCYHANDLER_P_H
#define QT3DCORE_DEPENDENCYHANDLER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/QMutex>
#include <QtCore/QVector>

#include <Qt3DCore/private/task_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DCore {

struct Dependency
{
    Dependency()
        : depender(nullptr)
        , dependee(nullptr)
    {}
    Dependency(RunnableInterface *depender, RunnableInterface *dependee)
        : depender(qMove(depender)),
          dependee(qMove(dependee)) {}

    RunnableInterface *depender;
    RunnableInterface *dependee;
};

} // namespace Qt3DCore

template <>
class QTypeInfo<Qt3DCore::Dependency> : public QTypeInfoMerger<Qt3DCore::Dependency, Qt3DCore::RunnableInterface *> {};

namespace Qt3DCore {

inline bool operator==(const Dependency &left, const Dependency &right)
{
    return left.depender == right.depender && left.dependee == right.dependee;
}

inline bool operator!=(const Dependency &left, const Dependency &right)
{
    return !operator==(left, right);
}

class DependencyHandler
{
public:
    DependencyHandler();

    void addDependencies(QVector<Dependency> dependencies);
    bool hasDependency(const RunnableInterface *depender);
    QVector<RunnableInterface *> freeDependencies(const RunnableInterface *task);
    void setMutex(QMutex *mutex) { m_mutex = mutex; }

private:
    Q_DISABLE_COPY(DependencyHandler)

    QVector<Dependency> m_dependencyMap;
    QMutex *m_mutex;
};

} // namespace Qt3DCore

QT_END_NAMESPACE

#endif // QT3DCORE_DEPENDENCYHANDLER_P_H

