// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant reason:default

#ifndef QDBUSPENDINGREPLY_H

#define QDBUSPENDINGREPLY_H

#include <QtDBus/qtdbusglobal.h>

#include <QtDBus/qdbusargument.h>

#include <QtDBus/qdbuspendingcall.h>

#ifndef QT_NO_DBUS

class tst_QDBusPendingReply;

QT_BEGIN_NAMESPACE

class Q_DBUS_EXPORT QDBusPendingReplyBase : public QDBusPendingCall

{

protected:

    QDBusPendingReplyBase();

#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)

    ~QDBusPendingReplyBase();

    QDBusPendingReplyBase(const QDBusPendingReplyBase &) = default;

    QDBusPendingReplyBase &operator=(const QDBusPendingReplyBase &) = default;

    QDBusPendingReplyBase(QDBusPendingReplyBase &&) noexcept = default;

    QDBusPendingReplyBase &operator=(QDBusPendingReplyBase &&) noexcept = default;

#endif

    void assign(const QDBusPendingCall &call);

    void assign(const QDBusMessage &message);

    QVariant argumentAt(int index) const;

    void setMetaTypes(int count, const QMetaType *metaTypes);

};

namespace QDBusPendingReplyTypes {

    template<int Index, typename T, typename... Types>

    struct Select

    {

        typedef Select<Index - 1, Types...> Next;

        typedef typename Next::Type Type;

    };

    template<typename T, typename... Types>

    struct Select<0, T, Types...>

    {

        typedef T Type;

    };

    template<typename T> inline QMetaType metaTypeFor()

    { return QMetaType::fromType<T>(); }

    // specialize for QVariant, allowing it to be used in place of QDBusVariant

    template<> inline QMetaType metaTypeFor<QVariant>()

    { return QMetaType::fromType<QDBusVariant>(); }

}

template<typename... Types>

class QDBusPendingReply : public QDBusPendingReplyBase

{

    friend class ::tst_QDBusPendingReply;

    template<int Index> using Select = QDBusPendingReplyTypes::Select<Index, Types...>;

public:

    enum { Count = std::is_same_v<typename Select<0>::Type, void> ? 0 : sizeof...(Types) };

    inline constexpr int count() const { return Count; }

    inline QDBusPendingReply() = default;

    // Rule Of Zero applies!

    inline Q_IMPLICIT QDBusPendingReply(const QDBusPendingCall &call) // required by qdbusxml2cpp-generated code

    { *this = call; }

    inline Q_IMPLICIT QDBusPendingReply(const QDBusMessage &message)

    { *this = message; }

    inline QDBusPendingReply &operator=(const QDBusPendingCall &call)

    { assign(call); return *this; }

    inline QDBusPendingReply &operator=(const QDBusMessage &message)

    { assign(message); return *this; }

    using QDBusPendingReplyBase::argumentAt;

    template<int Index> inline

    typename Select<Index>::Type argumentAt() const

    {

        static_assert(Index >= 0 && Index < Count, "Index out of bounds");

        typedef typename Select<Index>::Type ResultType;

        return qdbus_cast<ResultType>(argumentAt(Index));

    }

#if defined(Q_QDOC)

    bool isFinished() const;

    void waitForFinished();

    QVariant argumentAt(int index) const;

    bool isValid() const;

    bool isError() const;

    QDBusError error() const;

    QDBusMessage reply() const;

#endif

    inline typename Select<0>::Type value() const

    {

        return argumentAt<0>();

    }

    inline operator typename Select<0>::Type() const

    {

        return argumentAt<0>();

    }

private:

    inline void calculateMetaTypes()

    {

        if (!d) return;

        if constexpr (Count == 0) {

                setMetaTypes(0, nullptr);

        } else {

            std::array<QMetaType, Count> typeIds = { QDBusPendingReplyTypes::metaTypeFor<Types>()... };

            setMetaTypes(Count, typeIds.data());

        }

    }

    inline void assign(const QDBusPendingCall &call)

    {

        QDBusPendingReplyBase::assign(call);

        calculateMetaTypes();

    }

    inline void assign(const QDBusMessage &message)

    {

        QDBusPendingReplyBase::assign(message);

        calculateMetaTypes();

    }

};

template<>

class QDBusPendingReply<> : public QDBusPendingReplyBase

{

    friend class ::tst_QDBusPendingReply;

public:

    enum { Count = 0 };

    inline int count() const { return Count; }

    inline QDBusPendingReply() = default;

    // Rule Of Zero applies!

    inline Q_IMPLICIT QDBusPendingReply(const QDBusPendingCall &call) // required by qdbusxml2cpp-generated code

    { *this = call; }

    inline Q_IMPLICIT QDBusPendingReply(const QDBusMessage &message)

    { *this = message; }

    inline QDBusPendingReply &operator=(const QDBusPendingCall &call)

    { assign(call); return *this; }

    inline QDBusPendingReply &operator=(const QDBusMessage &message)

    { assign(message); return *this; }

private:

    inline void assign(const QDBusPendingCall &call)

    {

        QDBusPendingReplyBase::assign(call);

        if (d)

            setMetaTypes(0, nullptr);

    }

    inline void assign(const QDBusMessage &message)

    {

        QDBusPendingReplyBase::assign(message);

        if (d)

            setMetaTypes(0, nullptr);

    }

};

QT_END_NAMESPACE

#endif // QT_NO_DBUS

#endif