/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** packaging of this file. Please review the following information to
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** Alternatively, this file may be used under the terms of the GNU
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****************************************************************************/

#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 "task_p.h"

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

QT_BEGIN_NAMESPACE

namespace Qt3DCore {

struct Dependency
{
    Dependency() {}
    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