/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Quick 3D.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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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 or (at your option) 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.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#ifndef Q_QUICK3D_OBJECT_H
#define Q_QUICK3D_OBJECT_H

#include <QtQuick3D/qtquick3dglobal.h>

#include <QtQml/qqml.h>
#include <QtQml/qqmlcomponent.h>

#include <QtCore/QObject>
#include <QtCore/qsharedpointer.h>

QT_BEGIN_NAMESPACE

class QQuick3DObjectPrivate;
class QQuick3DSceneManager;
struct QSSGRenderGraphObject;

class Q_QUICK3D_EXPORT QQuick3DObject : public QObject, public QQmlParserStatus
{
    Q_OBJECT
    Q_INTERFACES(QQmlParserStatus)
    Q_DECLARE_PRIVATE(QQuick3DObject)
    Q_DISABLE_COPY(QQuick3DObject)

    Q_PROPERTY(QQuick3DObject *parent READ parentItem WRITE setParentItem NOTIFY parentChanged DESIGNABLE false FINAL)
    Q_PRIVATE_PROPERTY(QQuick3DObject::d_func(), QQmlListProperty<QObject> data READ data DESIGNABLE false)
    Q_PRIVATE_PROPERTY(QQuick3DObject::d_func(), QQmlListProperty<QObject> resources READ resources DESIGNABLE false)
    Q_PRIVATE_PROPERTY(QQuick3DObject::d_func(),
                       QQmlListProperty<QQuick3DObject> children READ children NOTIFY childrenChanged DESIGNABLE false)

    Q_PRIVATE_PROPERTY(QQuick3DObject::d_func(), QQmlListProperty<QQuickState> states READ states DESIGNABLE false)
    Q_PRIVATE_PROPERTY(QQuick3DObject::d_func(), QQmlListProperty<QQuickTransition> transitions READ transitions DESIGNABLE false)
    Q_PROPERTY(QString state READ state WRITE setState NOTIFY stateChanged)

    Q_CLASSINFO("DefaultProperty", "data")
    Q_CLASSINFO("qt_QmlJSWrapperFactoryMethod", "_q_createJSWrapper(QV4::ExecutionEngine*)")
public:
    enum ItemChange {
        ItemChildAddedChange, // value.item
        ItemChildRemovedChange, // value.item
        ItemSceneChange, // value.window
        ItemVisibleHasChanged, // value.boolValue
        ItemParentHasChanged, // value.item
        ItemOpacityHasChanged, // value.realValue
        ItemActiveFocusHasChanged, // value.boolValue
        ItemRotationHasChanged, // value.realValue
        ItemAntialiasingHasChanged, // value.boolValue
        ItemDevicePixelRatioHasChanged, // value.realValue
        ItemEnabledHasChanged // value.boolValue
    };

    struct ItemChangeData {
        ItemChangeData(QQuick3DObject *v) : item(v) {}
        ItemChangeData(const QSharedPointer<QQuick3DSceneManager> &v) : sceneManager(v) {}
        ItemChangeData(qreal v) : realValue(v) {}
        ItemChangeData(bool v) : boolValue(v) {}
        ~ItemChangeData() {}

        QSharedPointer<QQuick3DSceneManager> sceneManager;
        union {
            QQuick3DObject *item;
            qreal realValue;
            bool boolValue;
        };
    };

    explicit QQuick3DObject(QQuick3DObject *parent = nullptr);
    ~QQuick3DObject() override;

    QString state() const;
    void setState(const QString &state);

    QList<QQuick3DObject *> childItems() const;

    QQuick3DObject *parentItem() const;

public Q_SLOTS:
    void update();

    void setParentItem(QQuick3DObject *parentItem);

Q_SIGNALS:
    void parentChanged();
    void childrenChanged();
    void stateChanged();

protected:
    using ConnectionMap = QHash<QByteArray, QMetaObject::Connection>;
    virtual QSSGRenderGraphObject *updateSpatialNode(QSSGRenderGraphObject *node) = 0;
    virtual void markAllDirty();
    virtual void itemChange(ItemChange, const ItemChangeData &);
    explicit QQuick3DObject(QQuick3DObjectPrivate &dd, QQuick3DObject *parent = nullptr);

    void classBegin() override;
    void componentComplete() override;

    bool isComponentComplete() const;

    static void updatePropertyListener(QQuick3DObject *newO,
                                       QQuick3DObject *oldO,
                                       const QSharedPointer<QQuick3DSceneManager> &window,
                                       const QByteArray &propertyKey,
                                       ConnectionMap &connections,
                                       const std::function<void(QQuick3DObject *o)> &callFn);

private:
    Q_PRIVATE_SLOT(d_func(), void _q_resourceObjectDeleted(QObject *))
    Q_PRIVATE_SLOT(d_func(), quint64 _q_createJSWrapper(QV4::ExecutionEngine *))

    friend class QQuick3DSceneManager;
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QQuick3DObject)

#endif // Q_QUICK3D_OBJECT_H