/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 QJSMANAGEDVALUE_H
#define QJSMANAGEDVALUE_H

#include <QtQml/qtqmlglobal.h>
#include <QtQml/qjsprimitivevalue.h>
#include <QtQml/qjsvalue.h>

QT_BEGIN_NAMESPACE

namespace QV4 {
struct Value;
struct ExecutionEngine;
}

class QJSEngine;
class Q_QML_EXPORT QJSManagedValue
{
    Q_DISABLE_COPY(QJSManagedValue)
public:
    enum Type {
        Undefined,
        Boolean,
        Number,
        String,
        Object,
        Symbol,
        Function
    };

    QJSManagedValue() = default;
    QJSManagedValue(QJSValue value, QJSEngine *engine);
    QJSManagedValue(const QJSPrimitiveValue &value, QJSEngine *engine);
    QJSManagedValue(const QVariant &variant, QJSEngine *engine);
    QJSManagedValue(const QString &string, QJSEngine *engine);

    ~QJSManagedValue();
    QJSManagedValue(QJSManagedValue &&other);
    QJSManagedValue &operator=(QJSManagedValue &&other);

    bool equals(const QJSManagedValue &other) const;
    bool strictlyEquals(const QJSManagedValue &other) const;

    QJSEngine *engine() const;

    QJSManagedValue prototype() const;
    void setPrototype(const QJSManagedValue &prototype);

    Type type() const;

    // Compatibility with QJSValue
    bool isUndefined() const { return type() == Undefined; }
    bool isBoolean() const { return type() == Boolean; }
    bool isNumber() const { return type() == Number; }
    bool isString() const { return type() == String; }
    bool isObject() const { return type() == Object; }
    bool isSymbol() const { return type() == Symbol; }
    bool isFunction() const { return type() == Function; }

    // Special case of Number
    bool isInteger() const;

    // Selected special cases of Object
    bool isNull() const;
    bool isRegularExpression() const;
    bool isArray() const;
    bool isUrl() const;
    bool isVariant() const;
    bool isQObject() const;
    bool isQMetaObject() const;
    bool isDate() const;
    bool isError() const;
    bool isJsMetaType() const;

    // Native type transformations
    QString toString() const;
    double toNumber() const;
    bool toBoolean() const;

    // Variant-like type transformations
    QJSPrimitiveValue toPrimitive() const;
    QJSValue toJSValue() const;
    QVariant toVariant() const;

    // Special cases
    int toInteger() const;
    QRegularExpression toRegularExpression() const;
    QUrl toUrl() const;
    QObject *toQObject() const;
    const QMetaObject *toQMetaObject() const;
    QDateTime toDateTime() const;

    // Properties of objects
    bool hasProperty(const QString &name) const;
    bool hasOwnProperty(const QString &name) const;
    QJSValue property(const QString &name) const;
    void setProperty(const QString &name, const QJSValue &value);
    bool deleteProperty(const QString &name);

    //  ### Qt 7 use qsizetype instead.
    // Array indexing
    bool hasProperty(quint32 arrayIndex) const;
    bool hasOwnProperty(quint32 arrayIndex) const;
    QJSValue property(quint32 arrayIndex) const;
    void setProperty(quint32 arrayIndex, const QJSValue &value);
    bool deleteProperty(quint32 arrayIndex);

    // Calling functions
    QJSValue call(const QJSValueList &arguments = {}) const;
    QJSValue callWithInstance(const QJSValue &instance, const QJSValueList &arguments = {}) const;
    QJSValue callAsConstructor(const QJSValueList &arguments = {}) const;

    // JavaScript metatypes
    QJSManagedValue jsMetaType() const;
    QStringList jsMetaMembers() const;
    QJSManagedValue jsMetaInstantiate(const QJSValueList &values = {}) const;

private:
    friend class QJSValue;
    friend class QJSEngine;

    QJSManagedValue(QV4::ExecutionEngine *engine);
    QV4::Value *d = nullptr;
};

QT_END_NAMESPACE

#endif
