// Copyright (C) 2023 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

#include "qcapturablewindow.h"
#include "qcapturablewindow_p.h"
#include "qplatformmediaintegration_p.h"

QT_BEGIN_NAMESPACE

QT_DEFINE_QESDP_SPECIALIZATION_DTOR(QCapturableWindowPrivate)

/*!
    \class QCapturableWindow
    \inmodule QtMultimedia
    \ingroup multimedia
    \ingroup multimedia_video
    \since 6.6

    \brief Used for getting the basic information of a capturable window.

    The class contains a set of window information, except the method
    QCapturableWindow::isValid which pulls the current state
    whenever it's called.

    \sa QWindowCapture
*/
/*!
    \qmlvaluetype CapturableWindow
    \nativetype QCapturableWindow
    \brief The CapturableWindow type is used getting basic
    of a window that is available for capturing via WindowCapture.

    \inqmlmodule QtMultimedia
    \ingroup multimedia_qml
    \ingroup multimedia_video_qml
    \since 6.6

    The class contains a dump of window information, except the property
    'isValid' which pulls the actual window state every time.

    A CapturableWindow instance can be implicitly constructed from a
    \l [QML] Window. Application developers can utilize this by passing
    a QML Window into the 'window' property of a \l WindowCapture. See
    the following example.
    \qml
    Window {
        id: topWindow

        WindowCapture {
            window: topWindow
        }
    }
    \endqml

    \sa WindowCapture
*/

/*!
    \fn  QCapturableWindow::QCapturableWindow(QCapturableWindow &&other)

    Constructs a QCapturableWindow by moving from \a other.
*/

/*!
    \fn void QCapturableWindow::swap(QCapturableWindow &other) noexcept

    Swaps the current window information with \a other.
*/

/*!
    \fn  QCapturableWindow &QCapturableWindow::operator=(QCapturableWindow &&other)

    Moves \a other into this QCapturableWindow.
*/

/*!
    Constructs a null capturable window information that doesn't refer to any window.
*/
QCapturableWindow::QCapturableWindow() = default;

/*!
    Constructs a QCapturableWindow instance that maps to the given window.

    The description of the QCapturableWindow will match the title of the given QWindow.

    Note, the constructor may create an invalid instance if the specified \c QWindow
    has not been presented yet. Thus, if the Qt application is not running, an
    invalid \c QCapturableWindow instance is expected. The validity of the instance
    can be tracked by querying \l isValid over time.

    If given a nullptr as input, this method will return an instance that will never become valid.

    If given a window that is not top-level, this method will return an instance will never become
    valid.

    \since 6.11
*/
QCapturableWindow::QCapturableWindow(QWindow *window)
{
    q23::expected<QCapturableWindow, QString> capturableWindow =
            QPlatformMediaIntegration::instance()->capturableWindowFromQWindow(window);
    if (capturableWindow)
        *this = std::move(capturableWindow.value());
}

/*!
    Destroys the window information.
 */
QCapturableWindow::~QCapturableWindow() = default;

/*!
    Construct a new window information using \a other QCapturableWindow.
*/
QCapturableWindow::QCapturableWindow(const QCapturableWindow &other) = default;

/*!
    Assigns the \a other window information to this QCapturableWindow.
*/
QCapturableWindow& QCapturableWindow::operator=(const QCapturableWindow &other) = default;

/*!
    \fn bool QCapturableWindow::operator==(const QCapturableWindow &lhs, const QCapturableWindow &rhs)

    Returns \c true if window information \a lhs and \a rhs refer to the same window,
    otherwise returns \c false.
*/

/*!
    \fn bool QCapturableWindow::operator!=(const QCapturableWindow &lhs, const QCapturableWindow &rhs)

    Returns \c true if window information \a lhs and \a rhs refer to different windows,
    otherwise returns \c false.
*/
bool operator==(const QCapturableWindow &lhs, const QCapturableWindow &rhs) noexcept
{
    return lhs.d == rhs.d || (lhs.d && rhs.d && lhs.d->id == rhs.d->id);
}

/*!
    \qmlproperty string QtMultimedia::CapturableWindow::isValid

    This property identifies whether a window information is valid.

    An invalid window information refers to non-existing window or doesn't refer to any one.
*/

/*!
    Identifies whether a window information is valid.

    An invalid window information refers to non-existing window or doesn't refer to any one.

    Returns true if the window is valid, and false if it is not.
*/
bool QCapturableWindow::isValid() const
{
    return d && QPlatformMediaIntegration::instance()->isCapturableWindowValid(*d);
}

/*!
    \qmlproperty string QtMultimedia::CapturableWindow::description

    This property holds the description of the reffered window.
*/

/*!
    Returns a description of the window. In most cases it represents the window title.
*/
QString QCapturableWindow::description() const
{
    if (!d)
        return {};

    if (d->description.isEmpty() && d->id)
        return QLatin1String("Window 0x") + QString::number(d->id, 16);

    return d->description;
}

QCapturableWindow::QCapturableWindow(QCapturableWindowPrivate *capturablePrivate)
    : d(capturablePrivate)
{
}

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QCapturableWindow &window)
{
    dbg << QStringLiteral("Capturable window '%1'").arg(window.description());
    return dbg;
}
#endif


QT_END_NAMESPACE

#include "moc_qcapturablewindow.cpp"
