/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** 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.
**
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** 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
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****************************************************************************/

#ifndef QQMLCONTEXT_P_H
#define QQMLCONTEXT_P_H

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

#include <QtCore/qlist.h>
#include <QtCore/qstring.h>
#include <QtCore/qvariant.h>
#include <QtCore/qpointer.h>
#include <QtQml/qqmlcontext.h>
#include <QtQml/qqmllist.h>

#include <QtCore/private/qobject_p.h>
#include <QtCore/qtaggedpointer.h>
#include <QtQml/private/qqmlrefcount_p.h>

QT_BEGIN_NAMESPACE

class QQmlContextData;

class QQmlContextPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQmlContext)
public:
    static QQmlContextPrivate *get(QQmlContext *context) {
        return static_cast<QQmlContextPrivate *>(QObjectPrivate::get(context));
    }

    static QQmlContext *get(QQmlContextPrivate *context) {
        return static_cast<QQmlContext *>(context->q_func());
    }

    static qsizetype context_count(QQmlListProperty<QObject> *);
    static QObject *context_at(QQmlListProperty<QObject> *, qsizetype);

    void dropDestroyedQObject(const QString &name, QObject *destroyed);

    int notifyIndex() const { return m_notifyIndex; }
    void setNotifyIndex(int notifyIndex) { m_notifyIndex = notifyIndex; }

    int numPropertyValues() const { return m_propertyValues.count(); }
    void appendPropertyValue(const QVariant &value) { m_propertyValues.append(value); }
    void setPropertyValue(int index, const QVariant &value) { m_propertyValues[index] = value; }
    QVariant propertyValue(int index) const { return m_propertyValues[index]; }

    QList<QPointer<QObject>> instances() const { return m_instances; }
    void appendInstance(QObject *instance) { m_instances.append(instance); }
    void cleanInstances()
    {
        for (auto it = m_instances.begin(); it != m_instances.end();
             it->isNull() ? (it = m_instances.erase(it)) : ++it) {}
    }

    void emitDestruction();

private:
    friend class QQmlContextData;

    QQmlContextPrivate(QQmlContextData *data) : m_data(data) {}
    QQmlContextPrivate(QQmlContext *publicContext, QQmlContextData *parent,
                       QQmlEngine *engine = nullptr);

    // Intentionally a bare pointer. QQmlContextData knows whether it owns QQmlContext or vice
    // versa. If QQmlContext is the owner, QQmlContextData keeps an extra ref for its publicContext.
    // The publicContext ref is released when doing QQmlContextData::setPublicContext(nullptr).
    QQmlContextData *m_data;

    QList<QVariant> m_propertyValues;
    int m_notifyIndex = -1;

    // Only used for debugging
    QList<QPointer<QObject>> m_instances;
};

QT_END_NAMESPACE

#endif // QQMLCONTEXT_P_H