/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtCore module of the Qt Toolkit.
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** use the contact form at http://qt.digia.com/contact-us.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#ifndef QJSONOBJECT_H
#define QJSONOBJECT_H

#include <QtCore/qjsonvalue.h>
#include <QtCore/qiterator.h>

QT_BEGIN_NAMESPACE

class QDebug;
template <class Key, class T> class QMap;
typedef QMap<QString, QVariant> QVariantMap;

class Q_CORE_EXPORT QJsonObject
{
public:
    QJsonObject();
    ~QJsonObject();

    QJsonObject(const QJsonObject &other);
    QJsonObject &operator =(const QJsonObject &other);

    static QJsonObject fromVariantMap(const QVariantMap &map);
    QVariantMap toVariantMap() const;

    QStringList keys() const;
    int size() const;
    inline int count() const { return size(); }
    inline int length() const { return size(); }
    bool isEmpty() const;

    QJsonValue value(const QString &key) const;
    QJsonValue operator[] (const QString &key) const;
    QJsonValueRef operator[] (const QString &key);

    void remove(const QString &key);
    QJsonValue take(const QString &key);
    bool contains(const QString &key) const;

    bool operator==(const QJsonObject &other) const;
    bool operator!=(const QJsonObject &other) const;

    class const_iterator;

    class iterator
    {
        friend class const_iterator;
        friend class QJsonObject;
        QJsonObject *o;
        int i;

    public:
        typedef std::bidirectional_iterator_tag iterator_category;
        typedef int difference_type;
        typedef QJsonValue value_type;
//        typedef T *pointer;
        typedef QJsonValueRef reference;

        Q_DECL_CONSTEXPR inline iterator() : o(0), i(0) {}
        Q_DECL_CONSTEXPR inline iterator(QJsonObject *obj, int index) : o(obj), i(index) {}

        inline QString key() const { return o->keyAt(i); }
        inline QJsonValueRef value() const { return QJsonValueRef(o, i); }
        inline QJsonValueRef operator*() const { return QJsonValueRef(o, i); }
        //inline T *operator->() const { return &concrete(i)->value; }
        inline bool operator==(const iterator &other) const { return i == other.i; }
        inline bool operator!=(const iterator &other) const { return i != other.i; }

        inline iterator &operator++() { ++i; return *this; }
        inline iterator operator++(int) { iterator r = *this; ++i; return r; }
        inline iterator &operator--() { --i; return *this; }
        inline iterator operator--(int) { iterator r = *this; --i; return r; }
        inline iterator operator+(int j) const
        { iterator r = *this; r.i += j; return r; }
        inline iterator operator-(int j) const { return operator+(-j); }
        inline iterator &operator+=(int j) { i += j; return *this; }
        inline iterator &operator-=(int j) { i -= j; return *this; }

    public:
        inline bool operator==(const const_iterator &other) const { return i == other.i; }
        inline bool operator!=(const const_iterator &other) const { return i != other.i; }
    };
    friend class iterator;

    class const_iterator
    {
        friend class iterator;
        const QJsonObject *o;
        int i;

    public:
        typedef std::bidirectional_iterator_tag iterator_category;
        typedef int difference_type;
        typedef QJsonValue value_type;
        typedef QJsonValue reference;

        Q_DECL_CONSTEXPR inline const_iterator() : o(0), i(0) {}
        Q_DECL_CONSTEXPR inline const_iterator(const QJsonObject *obj, int index)
            : o(obj), i(index) {}
        inline const_iterator(const iterator &other)
            : o(other.o), i(other.i) {}

        inline QString key() const { return o->keyAt(i); }
        inline QJsonValue value() const { return o->valueAt(i); }
        inline QJsonValue operator*() const { return o->valueAt(i); }
        //inline const T *operator->() const { return &concrete(i)->value; }
        inline bool operator==(const const_iterator &other) const { return i == other.i; }
        inline bool operator!=(const const_iterator &other) const { return i != other.i; }

        inline const_iterator &operator++() { ++i; return *this; }
        inline const_iterator operator++(int) { const_iterator r = *this; ++i; return r; }
        inline const_iterator &operator--() { --i; return *this; }
        inline const_iterator operator--(int) { const_iterator r = *this; --i; return r; }
        inline const_iterator operator+(int j) const
        { const_iterator r = *this; r.i += j; return r; }
        inline const_iterator operator-(int j) const { return operator+(-j); }
        inline const_iterator &operator+=(int j) { i += j; return *this; }
        inline const_iterator &operator-=(int j) { i -= j; return *this; }

        inline bool operator==(const iterator &other) const { return i == other.i; }
        inline bool operator!=(const iterator &other) const { return i != other.i; }
    };
    friend class const_iterator;

    // STL style
    inline iterator begin() { detach(); return iterator(this, 0); }
    inline const_iterator begin() const { return const_iterator(this, 0); }
    inline const_iterator constBegin() const { return const_iterator(this, 0); }
    inline iterator end() { detach(); return iterator(this, size()); }
    inline const_iterator end() const { return const_iterator(this, size()); }
    inline const_iterator constEnd() const { return const_iterator(this, size()); }
    iterator erase(iterator it);

    // more Qt
    typedef iterator Iterator;
    typedef const_iterator ConstIterator;
    iterator find(const QString &key);
    const_iterator find(const QString &key) const { return constFind(key); }
    const_iterator constFind(const QString &key) const;
    iterator insert(const QString &key, const QJsonValue &value);

    // STL compatibility
    typedef QJsonValue mapped_type;
    typedef QString key_type;
    typedef int size_type;

    inline bool empty() const { return isEmpty(); }

private:
    friend class QJsonPrivate::Data;
    friend class QJsonValue;
    friend class QJsonDocument;
    friend class QJsonValueRef;

    friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QJsonObject &);

    QJsonObject(QJsonPrivate::Data *data, QJsonPrivate::Object *object);
    void detach(uint reserve = 0);
    void compact();

    QString keyAt(int i) const;
    QJsonValue valueAt(int i) const;
    void setValueAt(int i, const QJsonValue &val);

    QJsonPrivate::Data *d;
    QJsonPrivate::Object *o;
};

#ifndef QT_NO_DEBUG_STREAM
Q_CORE_EXPORT QDebug operator<<(QDebug, const QJsonObject &);
#endif

QT_END_NAMESPACE

#endif // QJSONOBJECT_H
