/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Copyright (C) 2019 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore 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
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** 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.
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QOBJECTDEFS_H
#define QOBJECTDEFS_H

#if defined(__OBJC__) && !defined(__cplusplus)
#  warning "File built in Objective-C mode (.m), but using Qt requires Objective-C++ (.mm)"
#endif

#include <QtCore/qnamespace.h>
#include <QtCore/qobjectdefs_impl.h>
#include <QtCore/qtmetamacros.h>

QT_BEGIN_NAMESPACE

class QByteArray;
struct QArrayData;

class QString;

#ifndef QT_NO_META_MACROS
// macro for onaming members
#ifdef METHOD
#undef METHOD
#endif
#ifdef SLOT
#undef SLOT
#endif
#ifdef SIGNAL
#undef SIGNAL
#endif
#endif // QT_NO_META_MACROS

Q_CORE_EXPORT const char *qFlagLocation(const char *method);

#ifndef QT_NO_META_MACROS
#ifndef QT_NO_DEBUG
# define QLOCATION "\0" __FILE__ ":" QT_STRINGIFY(__LINE__)
# ifndef QT_NO_KEYWORDS
#  define METHOD(a)   qFlagLocation("0"#a QLOCATION)
# endif
# define SLOT(a)     qFlagLocation("1"#a QLOCATION)
# define SIGNAL(a)   qFlagLocation("2"#a QLOCATION)
#else
# ifndef QT_NO_KEYWORDS
#  define METHOD(a)   "0"#a
# endif
# define SLOT(a)     "1"#a
# define SIGNAL(a)   "2"#a
#endif

#define QMETHOD_CODE  0                        // member type codes
#define QSLOT_CODE    1
#define QSIGNAL_CODE  2
#endif // QT_NO_META_MACROS

#define Q_ARG(type, data) QArgument<type >(#type, data)
#define Q_RETURN_ARG(type, data) QReturnArgument<type >(#type, data)

class QObject;
class QMetaMethod;
class QMetaEnum;
class QMetaProperty;
class QMetaClassInfo;

namespace QtPrivate {
class QMetaTypeInterface;
}

struct QMethodRawArguments
{
    void **arguments;
};

class Q_CORE_EXPORT QGenericArgument
{
public:
    inline QGenericArgument(const char *aName = nullptr, const void *aData = nullptr)
        : _data(aData), _name(aName) {}
    inline void *data() const { return const_cast<void *>(_data); }
    inline const char *name() const { return _name; }

private:
    const void *_data;
    const char *_name;
};

class Q_CORE_EXPORT QGenericReturnArgument: public QGenericArgument
{
public:
    inline QGenericReturnArgument(const char *aName = nullptr, void *aData = nullptr)
        : QGenericArgument(aName, aData)
        {}
};

template <class T>
class QArgument: public QGenericArgument
{
public:
    inline QArgument(const char *aName, const T &aData)
        : QGenericArgument(aName, static_cast<const void *>(&aData))
        {}
};
template <class T>
class QArgument<T &>: public QGenericArgument
{
public:
    inline QArgument(const char *aName, T &aData)
        : QGenericArgument(aName, static_cast<const void *>(&aData))
        {}
};


template <typename T>
class QReturnArgument: public QGenericReturnArgument
{
public:
    inline QReturnArgument(const char *aName, T &aData)
        : QGenericReturnArgument(aName, static_cast<void *>(&aData))
        {}
};

struct Q_CORE_EXPORT QMetaObject
{
    class Connection;
    const char *className() const;
    const QMetaObject *superClass() const;

    bool inherits(const QMetaObject *metaObject) const noexcept;
    QObject *cast(QObject *obj) const
    { return const_cast<QObject *>(cast(const_cast<const QObject *>(obj))); }
    const QObject *cast(const QObject *obj) const;

#if !defined(QT_NO_TRANSLATION) || defined(Q_CLANG_QDOC)
    QString tr(const char *s, const char *c, int n = -1) const;
#endif // QT_NO_TRANSLATION

    int methodOffset() const;
    int enumeratorOffset() const;
    int propertyOffset() const;
    int classInfoOffset() const;

    int constructorCount() const;
    int methodCount() const;
    int enumeratorCount() const;
    int propertyCount() const;
    int classInfoCount() const;

    int indexOfConstructor(const char *constructor) const;
    int indexOfMethod(const char *method) const;
    int indexOfSignal(const char *signal) const;
    int indexOfSlot(const char *slot) const;
    int indexOfEnumerator(const char *name) const;
    int indexOfProperty(const char *name) const;
    int indexOfClassInfo(const char *name) const;

    QMetaMethod constructor(int index) const;
    QMetaMethod method(int index) const;
    QMetaEnum enumerator(int index) const;
    QMetaProperty property(int index) const;
    QMetaClassInfo classInfo(int index) const;
    QMetaProperty userProperty() const;

    static bool checkConnectArgs(const char *signal, const char *method);
    static bool checkConnectArgs(const QMetaMethod &signal,
                                 const QMetaMethod &method);
    static QByteArray normalizedSignature(const char *method);
    static QByteArray normalizedType(const char *type);

    // internal index-based connect
    static Connection connect(const QObject *sender, int signal_index,
                        const QObject *receiver, int method_index,
                        int type = 0, int *types = nullptr);
    // internal index-based disconnect
    static bool disconnect(const QObject *sender, int signal_index,
                           const QObject *receiver, int method_index);
    static bool disconnectOne(const QObject *sender, int signal_index,
                              const QObject *receiver, int method_index);
    // internal slot-name based connect
    static void connectSlotsByName(QObject *o);

    // internal index-based signal activation
    static void activate(QObject *sender, int signal_index, void **argv);
    static void activate(QObject *sender, const QMetaObject *, int local_signal_index, void **argv);
    static void activate(QObject *sender, int signal_offset, int local_signal_index, void **argv);

    static bool invokeMethod(QObject *obj, const char *member,
                             Qt::ConnectionType,
                             QGenericReturnArgument ret,
                             QGenericArgument val0 = QGenericArgument(nullptr),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument());

    static inline bool invokeMethod(QObject *obj, const char *member,
                             QGenericReturnArgument ret,
                             QGenericArgument val0 = QGenericArgument(nullptr),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument())
    {
        return invokeMethod(obj, member, Qt::AutoConnection, ret, val0, val1, val2, val3,
                val4, val5, val6, val7, val8, val9);
    }

    static inline bool invokeMethod(QObject *obj, const char *member,
                             Qt::ConnectionType type,
                             QGenericArgument val0 = QGenericArgument(nullptr),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument())
    {
        return invokeMethod(obj, member, type, QGenericReturnArgument(), val0, val1, val2,
                                 val3, val4, val5, val6, val7, val8, val9);
    }

    static inline bool invokeMethod(QObject *obj, const char *member,
                             QGenericArgument val0 = QGenericArgument(nullptr),
                             QGenericArgument val1 = QGenericArgument(),
                             QGenericArgument val2 = QGenericArgument(),
                             QGenericArgument val3 = QGenericArgument(),
                             QGenericArgument val4 = QGenericArgument(),
                             QGenericArgument val5 = QGenericArgument(),
                             QGenericArgument val6 = QGenericArgument(),
                             QGenericArgument val7 = QGenericArgument(),
                             QGenericArgument val8 = QGenericArgument(),
                             QGenericArgument val9 = QGenericArgument())
    {
        return invokeMethod(obj, member, Qt::AutoConnection, QGenericReturnArgument(), val0,
                val1, val2, val3, val4, val5, val6, val7, val8, val9);
    }

#ifdef Q_CLANG_QDOC
    template<typename Functor, typename FunctorReturnType>
    static bool invokeMethod(QObject *context, Functor function, Qt::ConnectionType type = Qt::AutoConnection, FunctorReturnType *ret = nullptr);
    template<typename Functor, typename FunctorReturnType>
    static bool invokeMethod(QObject *context, Functor function, FunctorReturnType *ret);
#else

    // invokeMethod() for member function pointer
    template <typename Func>
    static typename std::enable_if<QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && !std::is_convertible<Func, const char*>::value
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == 0, bool>::type
    invokeMethod(typename QtPrivate::FunctionPointer<Func>::Object *object,
                 Func function,
                 Qt::ConnectionType type = Qt::AutoConnection,
                 typename QtPrivate::FunctionPointer<Func>::ReturnType *ret = nullptr)
    {
        return invokeMethodImpl(object, new QtPrivate::QSlotObjectWithNoArgs<Func>(function), type, ret);
    }

    template <typename Func>
    static typename std::enable_if<QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && !std::is_convertible<Func, const char*>::value
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == 0, bool>::type
    invokeMethod(typename QtPrivate::FunctionPointer<Func>::Object *object,
                 Func function,
                 typename QtPrivate::FunctionPointer<Func>::ReturnType *ret)
    {
        return invokeMethodImpl(object, new QtPrivate::QSlotObjectWithNoArgs<Func>(function), Qt::AutoConnection, ret);
    }

    // invokeMethod() for function pointer (not member)
    template <typename Func>
    static typename std::enable_if<!QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && !std::is_convertible<Func, const char*>::value
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == 0, bool>::type
    invokeMethod(QObject *context, Func function,
                 Qt::ConnectionType type = Qt::AutoConnection,
                 typename QtPrivate::FunctionPointer<Func>::ReturnType *ret = nullptr)
    {
        return invokeMethodImpl(context, new QtPrivate::QFunctorSlotObjectWithNoArgsImplicitReturn<Func>(function), type, ret);
    }

    template <typename Func>
    static typename std::enable_if<!QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && !std::is_convertible<Func, const char*>::value
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == 0, bool>::type
    invokeMethod(QObject *context, Func function,
                 typename QtPrivate::FunctionPointer<Func>::ReturnType *ret)
    {
        return invokeMethodImpl(context, new QtPrivate::QFunctorSlotObjectWithNoArgsImplicitReturn<Func>(function), Qt::AutoConnection, ret);
    }

    // invokeMethod() for Functor
    template <typename Func>
    static typename std::enable_if<!QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == -1
                                   && !std::is_convertible<Func, const char*>::value, bool>::type
    invokeMethod(QObject *context, Func function,
                 Qt::ConnectionType type = Qt::AutoConnection, decltype(function()) *ret = nullptr)
    {
        return invokeMethodImpl(context,
                                new QtPrivate::QFunctorSlotObjectWithNoArgs<Func, decltype(function())>(std::move(function)),
                                type,
                                ret);
    }

    template <typename Func>
    static typename std::enable_if<!QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction
                                   && QtPrivate::FunctionPointer<Func>::ArgumentCount == -1
                                   && !std::is_convertible<Func, const char*>::value, bool>::type
    invokeMethod(QObject *context, Func function, decltype(function()) *ret)
    {
        return invokeMethodImpl(context,
                                new QtPrivate::QFunctorSlotObjectWithNoArgs<Func, decltype(function())>(std::move(function)),
                                Qt::AutoConnection,
                                ret);
    }

#endif

    QObject *newInstance(QGenericArgument val0 = QGenericArgument(nullptr),
                         QGenericArgument val1 = QGenericArgument(),
                         QGenericArgument val2 = QGenericArgument(),
                         QGenericArgument val3 = QGenericArgument(),
                         QGenericArgument val4 = QGenericArgument(),
                         QGenericArgument val5 = QGenericArgument(),
                         QGenericArgument val6 = QGenericArgument(),
                         QGenericArgument val7 = QGenericArgument(),
                         QGenericArgument val8 = QGenericArgument(),
                         QGenericArgument val9 = QGenericArgument()) const;

    enum Call {
        InvokeMetaMethod,
        ReadProperty,
        WriteProperty,
        ResetProperty,
        CreateInstance,
        IndexOfMethod,
        RegisterPropertyMetaType,
        RegisterMethodArgumentMetaType,
        BindableProperty
    };

    int static_metacall(Call, int, void **) const;
    static int metacall(QObject *, Call, int, void **);

    template <const QMetaObject &MO> static constexpr const QMetaObject *staticMetaObject()
    {
        return &MO;
    }

    struct SuperData {
        const QMetaObject *direct;
        SuperData() = default;
        constexpr SuperData(std::nullptr_t) : direct(nullptr) {}
        constexpr SuperData(const QMetaObject *mo) : direct(mo) {}

        constexpr const QMetaObject *operator->() const { return operator const QMetaObject *(); }

#ifdef QT_NO_DATA_RELOCATION
        using Getter = const QMetaObject *(*)();
        Getter indirect = nullptr;
        constexpr SuperData(Getter g) : direct(nullptr), indirect(g) {}
        constexpr operator const QMetaObject *() const
        { return indirect ? indirect() : direct; }
        template <const QMetaObject &MO> static constexpr SuperData link()
        { return SuperData(QMetaObject::staticMetaObject<MO>); }
#else
        constexpr operator const QMetaObject *() const
        { return direct; }
        template <const QMetaObject &MO> static constexpr SuperData link()
        { return SuperData(QMetaObject::staticMetaObject<MO>()); }
#endif
    };

    struct Data { // private data
        SuperData superdata;
        const uint *stringdata;
        const uint *data;
        typedef void (*StaticMetacallFunction)(QObject *, QMetaObject::Call, int, void **);
        StaticMetacallFunction static_metacall;
        const SuperData *relatedMetaObjects;
        const QtPrivate::QMetaTypeInterface *const *metaTypes;
        void *extradata; //reserved for future use
    } d;

private:
    static bool invokeMethodImpl(QObject *object, QtPrivate::QSlotObjectBase *slot, Qt::ConnectionType type, void *ret);
    friend class QTimer;
};

class Q_CORE_EXPORT QMetaObject::Connection {
    void *d_ptr; //QObjectPrivate::Connection*
    explicit Connection(void *data) : d_ptr(data) {  }
    friend class QObject;
    friend class QObjectPrivate;
    friend struct QMetaObject;
    bool isConnected_helper() const;
public:
    ~Connection();
    Connection();
    Connection(const Connection &other);
    Connection &operator=(const Connection &other);
#ifdef Q_QDOC
    operator bool() const;
#else
    // still using the restricted bool trick here, in order to support
    // code using copy-init (e.g. `bool ok = connect(...)`)
    typedef void *Connection::*RestrictedBool;
    operator RestrictedBool() const { return d_ptr && isConnected_helper() ? &Connection::d_ptr : nullptr; }
#endif

    Connection(Connection &&other) noexcept : d_ptr(qExchange(other.d_ptr, nullptr)) {}
    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(Connection)
    void swap(Connection &other) noexcept { qSwap(d_ptr, other.d_ptr); }
};

inline void swap(QMetaObject::Connection &lhs, QMetaObject::Connection &rhs) noexcept
{
    lhs.swap(rhs);
}

inline const QMetaObject *QMetaObject::superClass() const
{ return d.superdata; }

namespace QtPrivate {
    /* Trait that tells is a the Object has a Q_OBJECT macro */
    template <typename Object> struct HasQ_OBJECT_Macro {
        template <typename T>
        static char test(int (T::*)(QMetaObject::Call, int, void **));
        static int test(int (Object::*)(QMetaObject::Call, int, void **));
        enum { Value =  sizeof(test(&Object::qt_metacall)) == sizeof(int) };
    };
}

QT_END_NAMESPACE

#endif // QOBJECTDEFS_H
