/********************************************************************
Copyright 2014  Martin Gräßlin <mgraesslin@kde.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) version 3, or any
later version accepted by the membership of KDE e.V. (or its
successor approved by the membership of KDE e.V.), which shall
act as a proxy defined in Section 6 of version 3 of the license.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "seat_interface.h"
#include "seat_interface_p.h"
#include "display.h"
#include "datadevice_interface.h"
#include "datasource_interface.h"
#include "keyboard_interface.h"
#include "keyboard_interface_p.h"
#include "pointer_interface.h"
#include "pointer_interface_p.h"
#include "surface_interface.h"
#include "textinput_interface_p.h"
// Wayland
#ifndef WL_SEAT_NAME_SINCE_VERSION
#define WL_SEAT_NAME_SINCE_VERSION 2
#endif
// linux
#include <config-kwayland.h>
#if HAVE_LINUX_INPUT_H
#include <linux/input.h>
#endif

#include <functional>

namespace KWayland
{

namespace Server
{

const quint32 SeatInterface::Private::s_version = 5;
const qint32 SeatInterface::Private::s_pointerVersion = 5;
const qint32 SeatInterface::Private::s_touchVersion = 5;
const qint32 SeatInterface::Private::s_keyboardVersion = 5;

SeatInterface::Private::Private(SeatInterface *q, Display *display)
    : Global::Private(display, &wl_seat_interface, s_version)
    , q(q)
{
}

#ifndef DOXYGEN_SHOULD_SKIP_THIS
const struct wl_seat_interface SeatInterface::Private::s_interface = {
    getPointerCallback,
    getKeyboardCallback,
    getTouchCallback,
    releaseCallback
};
#endif

SeatInterface::SeatInterface(Display *display, QObject *parent)
    : Global(new Private(this, display), parent)
{
    Q_D();
    connect(this, &SeatInterface::nameChanged, this,
        [d] {
            for (auto it = d->resources.constBegin(); it != d->resources.constEnd(); ++it) {
                d->sendName(*it);
            }
        }
    );
    auto sendCapabilitiesAll = [d] {
        for (auto it = d->resources.constBegin(); it != d->resources.constEnd(); ++it) {
            d->sendCapabilities(*it);
        }
    };
    connect(this, &SeatInterface::hasPointerChanged,  this, sendCapabilitiesAll);
    connect(this, &SeatInterface::hasKeyboardChanged, this, sendCapabilitiesAll);
    connect(this, &SeatInterface::hasTouchChanged,    this, sendCapabilitiesAll);
}

SeatInterface::~SeatInterface()
{
    Q_D();
    while (!d->resources.isEmpty()) {
        wl_resource_destroy(d->resources.takeLast());
    }
}

void SeatInterface::Private::bind(wl_client *client, uint32_t version, uint32_t id)
{
    wl_resource *r = wl_resource_create(client, &wl_seat_interface, qMin(s_version, version), id);
    if (!r) {
        wl_client_post_no_memory(client);
        return;
    }
    resources << r;

    wl_resource_set_implementation(r, &s_interface, this, unbind);

    sendCapabilities(r);
    sendName(r);
}

void SeatInterface::Private::unbind(wl_resource *r)
{
    cast(r)->resources.removeAll(r);
}

void SeatInterface::Private::releaseCallback(wl_client *client, wl_resource *resource)
{
    Q_UNUSED(client)
    wl_resource_destroy(resource);
}

void SeatInterface::Private::updatePointerButtonSerial(quint32 button, quint32 serial)
{
    auto it = globalPointer.buttonSerials.find(button);
    if (it == globalPointer.buttonSerials.end()) {
        globalPointer.buttonSerials.insert(button, serial);
        return;
    }
    it.value() = serial;
}

void SeatInterface::Private::updatePointerButtonState(quint32 button, Pointer::State state)
{
    auto it = globalPointer.buttonStates.find(button);
    if (it == globalPointer.buttonStates.end()) {
        globalPointer.buttonStates.insert(button, state);
        return;
    }
    it.value() = state;
}

bool SeatInterface::Private::updateKey(quint32 key, Keyboard::State state)
{
    auto it = keys.states.find(key);
    if (it == keys.states.end()) {
        keys.states.insert(key, state);
        return true;
    }
    if (it.value() == state) {
        return false;
    }
    it.value() = state;
    return true;
}

void SeatInterface::Private::sendName(wl_resource *r)
{
    if (wl_resource_get_version(r) < WL_SEAT_NAME_SINCE_VERSION) {
        return;
    }
    wl_seat_send_name(r, name.toUtf8().constData());
}

void SeatInterface::Private::sendCapabilities(wl_resource *r)
{
    uint32_t capabilities = 0;
    if (pointer) {
        capabilities |= WL_SEAT_CAPABILITY_POINTER;
    }
    if (keyboard) {
        capabilities |= WL_SEAT_CAPABILITY_KEYBOARD;
    }
    if (touch) {
        capabilities |= WL_SEAT_CAPABILITY_TOUCH;
    }
    wl_seat_send_capabilities(r, capabilities);
}

SeatInterface::Private *SeatInterface::Private::cast(wl_resource *r)
{
    return r ? reinterpret_cast<SeatInterface::Private*>(wl_resource_get_user_data(r)) : nullptr;
}

namespace {
template <typename T>
static
T *interfaceForSurface(SurfaceInterface *surface, const QVector<T*> &interfaces)
{
    if (!surface) {
        return nullptr;
    }

    for (auto it = interfaces.constBegin(); it != interfaces.constEnd(); ++it) {
        if ((*it)->client() == surface->client()) {
            return (*it);
        }
    }
    return nullptr;
}

template <typename T>
static
QVector<T *> interfacesForSurface(SurfaceInterface *surface, const QVector<T*> &interfaces)
{
    QVector<T *> ret;
    if (!surface) {
        return ret;
    }

    for (auto it = interfaces.constBegin(); it != interfaces.constEnd(); ++it) {
        if ((*it)->client() == surface->client() && (*it)->resource()) {
            ret << *it;
        }
    }
    return ret;
}

template <typename T>
static
bool forEachInterface(SurfaceInterface *surface, const QVector<T*> &interfaces, std::function<void (T*)> method)
{
    if (!surface) {
        return false;
    }
    bool calledAtLeastOne = false;
    for (auto it = interfaces.constBegin(); it != interfaces.constEnd(); ++it) {
        if ((*it)->client() == surface->client() && (*it)->resource()) {
            method(*it);
            calledAtLeastOne = true;
        }
    }
    return calledAtLeastOne;
}

}

QVector<PointerInterface *> SeatInterface::Private::pointersForSurface(SurfaceInterface *surface) const
{
    return interfacesForSurface(surface, pointers);
}

QVector<KeyboardInterface *> SeatInterface::Private::keyboardsForSurface(SurfaceInterface *surface) const
{
    return interfacesForSurface(surface, keyboards);
}

QVector<TouchInterface *> SeatInterface::Private::touchsForSurface(SurfaceInterface *surface) const
{
    return interfacesForSurface(surface, touchs);
}

DataDeviceInterface *SeatInterface::Private::dataDeviceForSurface(SurfaceInterface *surface) const
{
    return interfaceForSurface(surface, dataDevices);
}

TextInputInterface *SeatInterface::Private::textInputForSurface(SurfaceInterface *surface) const
{
    return interfaceForSurface(surface, textInputs);
}

void SeatInterface::Private::registerDataDevice(DataDeviceInterface *dataDevice)
{
    Q_ASSERT(dataDevice->seat() == q);
    dataDevices << dataDevice;
    auto dataDeviceCleanup = [this, dataDevice] {
        dataDevices.removeOne(dataDevice);
        if (keys.focus.selection == dataDevice) {
            keys.focus.selection = nullptr;
        }
        if (currentSelection == dataDevice) {
            // current selection is cleared
            currentSelection = nullptr;
            emit q->selectionChanged(nullptr);
            if (keys.focus.selection) {
                keys.focus.selection->sendClearSelection();
            }
        }
    };
    QObject::connect(dataDevice, &QObject::destroyed, q, dataDeviceCleanup);
    QObject::connect(dataDevice, &Resource::unbound, q, dataDeviceCleanup);
    QObject::connect(dataDevice, &DataDeviceInterface::selectionChanged, q,
        [this, dataDevice] {
            updateSelection(dataDevice, true);
        }
    );
    QObject::connect(dataDevice, &DataDeviceInterface::selectionCleared, q,
        [this, dataDevice] {
            updateSelection(dataDevice, false);
        }
    );
    QObject::connect(dataDevice, &DataDeviceInterface::dragStarted, q,
        [this, dataDevice] {
            const auto dragSerial = dataDevice->dragImplicitGrabSerial();
            auto *dragSurface = dataDevice->origin();
            if (q->hasImplicitPointerGrab(dragSerial)) {
                drag.mode = Drag::Mode::Pointer;
                drag.sourcePointer = interfaceForSurface(dragSurface, pointers);
                drag.transformation = globalPointer.focus.transformation;
            } else if (q->hasImplicitTouchGrab(dragSerial)) {
                drag.mode = Drag::Mode::Touch;
                drag.sourceTouch = interfaceForSurface(dragSurface, touchs);
                // TODO: touch transformation
            } else {
                // no implicit grab, abort drag
                return;
            }
            auto *originSurface = dataDevice->origin();
            const bool proxied = originSurface->dataProxy();
            if (!proxied) {
                // origin surface
                drag.target = dataDevice;
                drag.surface = originSurface;
                // TODO: transformation needs to be either pointer or touch
                drag.transformation = globalPointer.focus.transformation;
            }
            drag.source = dataDevice;
            drag.sourcePointer = interfaceForSurface(originSurface, pointers);
            drag.destroyConnection = QObject::connect(dataDevice, &QObject::destroyed, q,
                [this] {
                    endDrag(display->nextSerial());
                }
            );
            if (dataDevice->dragSource()) {
                drag.dragSourceDestroyConnection = QObject::connect(dataDevice->dragSource(), &Resource::aboutToBeUnbound, q,
                    [this] {
                        const auto serial = display->nextSerial();
                        if (drag.target) {
                            drag.target->updateDragTarget(nullptr, serial);
                            drag.target = nullptr;
                        }
                        endDrag(serial);
                    }
                );
            } else {
                drag.dragSourceDestroyConnection = QMetaObject::Connection();
            }
            dataDevice->updateDragTarget(proxied ? nullptr : originSurface, dataDevice->dragImplicitGrabSerial());
            emit q->dragStarted();
            emit q->dragSurfaceChanged();
        }
    );
    // is the new DataDevice for the current keyoard focus?
    if (keys.focus.surface && !keys.focus.selection) {
        // same client?
        if (keys.focus.surface->client() == dataDevice->client()) {
            keys.focus.selection = dataDevice;
            if (currentSelection && currentSelection->selection()) {
                dataDevice->sendSelection(currentSelection);
            }
        }
    }
}


void SeatInterface::Private::registerTextInput(TextInputInterface *ti)
{
    // text input version 0 might call this multiple times
    if (textInputs.contains(ti)) {
        return;
    }
    textInputs << ti;
    if (textInput.focus.surface && textInput.focus.surface->client() == ti->client()) {
        // this is a text input for the currently focused text input surface
        if (!textInput.focus.textInput) {
            textInput.focus.textInput = ti;
            ti->d_func()->sendEnter(textInput.focus.surface, textInput.focus.serial);
            emit q->focusedTextInputChanged();
        }
    }
    QObject::connect(ti, &QObject::destroyed, q,
        [this, ti] {
            textInputs.removeAt(textInputs.indexOf(ti));
            if (textInput.focus.textInput == ti) {
                textInput.focus.textInput = nullptr;
                emit q->focusedTextInputChanged();
            }
        }
    );
}

void SeatInterface::Private::endDrag(quint32 serial)
{
    auto target = drag.target;
    QObject::disconnect(drag.destroyConnection);
    QObject::disconnect(drag.dragSourceDestroyConnection);
    if (drag.source && drag.source->dragSource()) {
        drag.source->dragSource()->dropPerformed();
    }
    if (target) {
        target->drop();
        target->updateDragTarget(nullptr, serial);
    }
    drag = Drag();
    emit q->dragSurfaceChanged();
    emit q->dragEnded();
}

void SeatInterface::Private::cancelPreviousSelection(DataDeviceInterface *dataDevice)
{
    if (!currentSelection) {
        return;
    }
    if (auto s = currentSelection->selection()) {
        if (currentSelection != dataDevice) {
            // only if current selection is not on the same device
            // that would cancel the newly set source
            s->cancel();
        }
    }
}

void SeatInterface::Private::updateSelection(DataDeviceInterface *dataDevice, bool set)
{
    bool selChanged = currentSelection != dataDevice;
    if (keys.focus.surface && (keys.focus.surface->client() == dataDevice->client())) {
        // cancel the previous selection
        cancelPreviousSelection(dataDevice);
        // new selection on a data device belonging to current keyboard focus
        currentSelection = dataDevice;
    }
    if (dataDevice == currentSelection) {
        // need to send out the selection
        if (keys.focus.selection) {
            if (set) {
                keys.focus.selection->sendSelection(dataDevice);
            } else {
                keys.focus.selection->sendClearSelection();
                currentSelection = nullptr;
                selChanged = true;
            }
        }
    }
    if (selChanged) {
        emit q->selectionChanged(currentSelection);
    }
}

void SeatInterface::setHasKeyboard(bool has)
{
    Q_D();
    if (d->keyboard == has) {
        return;
    }
    d->keyboard = has;
    emit hasKeyboardChanged(d->keyboard);
}

void SeatInterface::setHasPointer(bool has)
{
    Q_D();
    if (d->pointer == has) {
        return;
    }
    d->pointer = has;
    emit hasPointerChanged(d->pointer);
}

void SeatInterface::setHasTouch(bool has)
{
    Q_D();
    if (d->touch == has) {
        return;
    }
    d->touch = has;
    emit hasTouchChanged(d->touch);
}

void SeatInterface::setName(const QString &name)
{
    Q_D();
    if (d->name == name) {
        return;
    }
    d->name = name;
    emit nameChanged(d->name);
}

void SeatInterface::Private::getPointerCallback(wl_client *client, wl_resource *resource, uint32_t id)
{
    cast(resource)->getPointer(client, resource, id);
}

void SeatInterface::Private::getPointer(wl_client *client, wl_resource *resource, uint32_t id)
{
    // TODO: only create if seat has pointer?
    PointerInterface *pointer = new PointerInterface(q, resource);
    auto clientConnection = display->getConnection(client);
    pointer->create(clientConnection, qMin(wl_resource_get_version(resource), s_pointerVersion), id);
    if (!pointer->resource()) {
        wl_resource_post_no_memory(resource);
        delete pointer;
        return;
    }
    pointers << pointer;
    if (globalPointer.focus.surface && globalPointer.focus.surface->client() == clientConnection) {
        // this is a pointer for the currently focused pointer surface
        globalPointer.focus.pointers << pointer;
        pointer->setFocusedSurface(globalPointer.focus.surface, globalPointer.focus.serial);
        pointer->d_func()->sendFrame();
        if (globalPointer.focus.pointers.count() == 1) {
            // got a new pointer
            emit q->focusedPointerChanged(pointer);
        }
    }
    QObject::connect(pointer, &QObject::destroyed, q,
        [pointer,this] {
            pointers.removeAt(pointers.indexOf(pointer));
            if (globalPointer.focus.pointers.removeOne(pointer)) {
                if (globalPointer.focus.pointers.isEmpty()) {
                    emit q->focusedPointerChanged(nullptr);
                }
            }
        }
    );
    emit q->pointerCreated(pointer);
}

void SeatInterface::Private::getKeyboardCallback(wl_client *client, wl_resource *resource, uint32_t id)
{
    cast(resource)->getKeyboard(client, resource, id);
}

void SeatInterface::Private::getKeyboard(wl_client *client, wl_resource *resource, uint32_t id)
{
    // TODO: only create if seat has keyboard?
    KeyboardInterface *keyboard = new KeyboardInterface(q, resource);
    auto clientConnection = display->getConnection(client);
    keyboard->create(clientConnection, qMin(wl_resource_get_version(resource), s_keyboardVersion) , id);
    if (!keyboard->resource()) {
        wl_resource_post_no_memory(resource);
        delete keyboard;
        return;
    }
    keyboard->repeatInfo(keys.keyRepeat.charactersPerSecond, keys.keyRepeat.delay);
    if (keys.keymap.xkbcommonCompatible) {
        keyboard->setKeymap(keys.keymap.fd, keys.keymap.size);
    }
    keyboards << keyboard;
    if (keys.focus.surface && keys.focus.surface->client() == clientConnection) {
        // this is a keyboard for the currently focused keyboard surface
        keys.focus.keyboards << keyboard;
        keyboard->setFocusedSurface(keys.focus.surface, keys.focus.serial);
    }
    QObject::connect(keyboard, &QObject::destroyed, q,
        [keyboard,this] {
            keyboards.removeAt(keyboards.indexOf(keyboard));
            keys.focus.keyboards.removeOne(keyboard);
        }
    );
    emit q->keyboardCreated(keyboard);
}

void SeatInterface::Private::getTouchCallback(wl_client *client, wl_resource *resource, uint32_t id)
{
    cast(resource)->getTouch(client, resource, id);
}

void SeatInterface::Private::getTouch(wl_client *client, wl_resource *resource, uint32_t id)
{
    // TODO: only create if seat has touch?
    TouchInterface *touch = new TouchInterface(q, resource);
    auto clientConnection = display->getConnection(client);
    touch->create(clientConnection, qMin(wl_resource_get_version(resource), s_touchVersion), id);
    if (!touch->resource()) {
        wl_resource_post_no_memory(resource);
        delete touch;
        return;
    }
    touchs << touch;
    if (globalTouch.focus.surface && globalTouch.focus.surface->client() == clientConnection) {
        // this is a touch for the currently focused touch surface
        globalTouch.focus.touchs << touch;
        if (!globalTouch.ids.isEmpty()) {
            // TODO: send out all the points
        }
    }
    QObject::connect(touch, &QObject::destroyed, q,
        [touch,this] {
            touchs.removeAt(touchs.indexOf(touch));
            globalTouch.focus.touchs.removeOne(touch);
        }
    );
    emit q->touchCreated(touch);
}

QString SeatInterface::name() const
{
    Q_D();
    return d->name;
}

bool SeatInterface::hasPointer() const
{
    Q_D();
    return d->pointer;
}

bool SeatInterface::hasKeyboard() const
{
    Q_D();
    return d->keyboard;
}

bool SeatInterface::hasTouch() const
{
    Q_D();
    return d->touch;
}

SeatInterface *SeatInterface::get(wl_resource *native)
{
    return Private::get(native);
}

SeatInterface::Private *SeatInterface::d_func() const
{
    return reinterpret_cast<Private*>(d.data());
}

QPointF SeatInterface::pointerPos() const
{
    Q_D();
    return d->globalPointer.pos;
}

void SeatInterface::setPointerPos(const QPointF &pos)
{
    Q_D();
    if (d->globalPointer.pos == pos) {
        return;
    }
    d->globalPointer.pos = pos;
    emit pointerPosChanged(pos);
}

quint32 SeatInterface::timestamp() const
{
    Q_D();
    return d->timestamp;
}

void SeatInterface::setTimestamp(quint32 time)
{
    Q_D();
    if (d->timestamp == time) {
        return;
    }
    d->timestamp = time;
    emit timestampChanged(time);
}

void SeatInterface::setDragTarget(SurfaceInterface *surface, const QPointF &globalPosition, const QMatrix4x4 &inputTransformation)
{
    Q_D();
    if (surface == d->drag.surface) {
        // no change
        return;
    }
    const quint32 serial = d->display->nextSerial();
    if (d->drag.target) {
        d->drag.target->updateDragTarget(nullptr, serial);
    }
    d->drag.target = d->dataDeviceForSurface(surface);
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        setPointerPos(globalPosition);
    } else if (d->drag.mode == Private::Drag::Mode::Touch &&
               d->globalTouch.focus.firstTouchPos != globalPosition) {
        touchMove(d->globalTouch.ids.first(), globalPosition);
    }
    if (d->drag.target) {
        d->drag.surface = surface;
        d->drag.transformation = inputTransformation;
        d->drag.target->updateDragTarget(surface, serial);
    } else {
        d->drag.surface = nullptr;
    }
    emit dragSurfaceChanged();
    return;
}

void SeatInterface::setDragTarget(SurfaceInterface *surface, const QMatrix4x4 &inputTransformation)
{
    Q_D();
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        setDragTarget(surface, pointerPos(), inputTransformation);
    } else {
        Q_ASSERT(d->drag.mode == Private::Drag::Mode::Touch);
        setDragTarget(surface, d->globalTouch.focus.firstTouchPos, inputTransformation);
    }

}

SurfaceInterface *SeatInterface::focusedPointerSurface() const
{
    Q_D();
    return d->globalPointer.focus.surface;
}

void SeatInterface::setFocusedPointerSurface(SurfaceInterface *surface, const QPointF &surfacePosition)
{
    QMatrix4x4 m;
    m.translate(-surfacePosition.x(), -surfacePosition.y());
    setFocusedPointerSurface(surface, m);
    Q_D();
    if (d->globalPointer.focus.surface) {
        d->globalPointer.focus.offset = surfacePosition;
    }
}

void SeatInterface::setFocusedPointerSurface(SurfaceInterface *surface, const QMatrix4x4 &transformation)
{
    Q_D();
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        // ignore
        return;
    }
    const quint32 serial = d->display->nextSerial();
    QSet<PointerInterface *> framePointers;
    for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
        (*it)->setFocusedSurface(nullptr, serial);
        framePointers << *it;
    }
    if (d->globalPointer.focus.surface) {
        disconnect(d->globalPointer.focus.destroyConnection);
    }
    d->globalPointer.focus = Private::Pointer::Focus();
    d->globalPointer.focus.surface = surface;
    auto p = d->pointersForSurface(surface);
    d->globalPointer.focus.pointers = p;
    if (d->globalPointer.focus.surface) {
        d->globalPointer.focus.destroyConnection = connect(surface, &QObject::destroyed, this,
            [this] {
                Q_D();
                d->globalPointer.focus = Private::Pointer::Focus();
                emit focusedPointerChanged(nullptr);
            }
        );
        d->globalPointer.focus.offset = QPointF();
        d->globalPointer.focus.transformation = transformation;
        d->globalPointer.focus.serial = serial;
    }
    if (p.isEmpty()) {
        emit focusedPointerChanged(nullptr);
        for (auto p : qAsConst(framePointers))
        {
            p->d_func()->sendFrame();
        }
        return;
    }
    // TODO: signal with all pointers
    emit focusedPointerChanged(p.first());
    for (auto it = p.constBegin(), end = p.constEnd(); it != end; ++it) {
        (*it)->setFocusedSurface(surface, serial);
        framePointers << *it;
    }
    for (auto p : qAsConst(framePointers))
    {
        p->d_func()->sendFrame();
    }
}

PointerInterface *SeatInterface::focusedPointer() const
{
    Q_D();
    if (d->globalPointer.focus.pointers.isEmpty()) {
        return nullptr;
    }
    return d->globalPointer.focus.pointers.first();
}

void SeatInterface::setFocusedPointerSurfacePosition(const QPointF &surfacePosition)
{
    Q_D();
    if (d->globalPointer.focus.surface) {
        d->globalPointer.focus.offset = surfacePosition;
        d->globalPointer.focus.transformation = QMatrix4x4();
        d->globalPointer.focus.transformation.translate(-surfacePosition.x(), -surfacePosition.y());
    }
}

QPointF SeatInterface::focusedPointerSurfacePosition() const
{
    Q_D();
    return d->globalPointer.focus.offset;
}

void SeatInterface::setFocusedPointerSurfaceTransformation(const QMatrix4x4 &transformation)
{
    Q_D();
    if (d->globalPointer.focus.surface) {
        d->globalPointer.focus.transformation = transformation;
    }
}

QMatrix4x4 SeatInterface::focusedPointerSurfaceTransformation() const
{
    Q_D();
    return d->globalPointer.focus.transformation;
}

namespace {
static quint32 qtToWaylandButton(Qt::MouseButton button)
{
#if HAVE_LINUX_INPUT_H
    static const QHash<Qt::MouseButton, quint32> s_buttons({
        {Qt::LeftButton, BTN_LEFT},
        {Qt::RightButton, BTN_RIGHT},
        {Qt::MiddleButton, BTN_MIDDLE},
        {Qt::ExtraButton1, BTN_BACK},    // note: QtWayland maps BTN_SIDE
        {Qt::ExtraButton2, BTN_FORWARD}, // note: QtWayland maps BTN_EXTRA
        {Qt::ExtraButton3, BTN_TASK},    // note: QtWayland maps BTN_FORWARD
        {Qt::ExtraButton4, BTN_EXTRA},   // note: QtWayland maps BTN_BACK
        {Qt::ExtraButton5, BTN_SIDE},    // note: QtWayland maps BTN_TASK
        {Qt::ExtraButton6, BTN_TASK + 1},
        {Qt::ExtraButton7, BTN_TASK + 2},
        {Qt::ExtraButton8, BTN_TASK + 3},
        {Qt::ExtraButton9, BTN_TASK + 4},
        {Qt::ExtraButton10, BTN_TASK + 5},
        {Qt::ExtraButton11, BTN_TASK + 6},
        {Qt::ExtraButton12, BTN_TASK + 7},
        {Qt::ExtraButton13, BTN_TASK + 8}
        // further mapping not possible, 0x120 is BTN_JOYSTICK
    });
    return s_buttons.value(button, 0);
#else
    return 0;
#endif
}
}

bool SeatInterface::isPointerButtonPressed(Qt::MouseButton button) const
{
    return isPointerButtonPressed(qtToWaylandButton(button));
}

bool SeatInterface::isPointerButtonPressed(quint32 button) const
{
    Q_D();
    auto it = d->globalPointer.buttonStates.constFind(button);
    if (it == d->globalPointer.buttonStates.constEnd()) {
        return false;
    }
    return it.value() == Private::Pointer::State::Pressed ? true : false;
}

void SeatInterface::pointerAxisV5(Qt::Orientation orientation, qreal delta, qint32 discreteDelta, PointerAxisSource source)
{
    Q_D();
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        // ignore
        return;
    }
    if (d->globalPointer.focus.surface) {
        for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
            (*it)->axis(orientation, delta, discreteDelta, source);
        }
    }
}

void SeatInterface::pointerAxis(Qt::Orientation orientation, quint32 delta)
{
    Q_D();
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        // ignore
        return;
    }
    if (d->globalPointer.focus.surface) {
        for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
            (*it)->axis(orientation, delta);
        }
    }
}

void SeatInterface::pointerButtonPressed(Qt::MouseButton button)
{
    const quint32 nativeButton = qtToWaylandButton(button);
    if (nativeButton == 0) {
        return;
    }
    pointerButtonPressed(nativeButton);
}

void SeatInterface::pointerButtonPressed(quint32 button)
{
    Q_D();
    const quint32 serial = d->display->nextSerial();
    d->updatePointerButtonSerial(button, serial);
    d->updatePointerButtonState(button, Private::Pointer::State::Pressed);
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        // ignore
        return;
    }
    if (auto *focusSurface = d->globalPointer.focus.surface) {
        for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
            (*it)->buttonPressed(button, serial);
        }
        if (focusSurface == d->keys.focus.surface) {
            // update the focused child surface
            auto p = focusedPointer();
            if (p) {
                for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
                    (*it)->d_func()->focusChildSurface(p->d_func()->focusedChildSurface, serial);
                }
            }
        }
    }
}

void SeatInterface::pointerButtonReleased(Qt::MouseButton button)
{
    const quint32 nativeButton = qtToWaylandButton(button);
    if (nativeButton == 0) {
        return;
    }
    pointerButtonReleased(nativeButton);
}

void SeatInterface::pointerButtonReleased(quint32 button)
{
    Q_D();
    const quint32 serial = d->display->nextSerial();
    const quint32 currentButtonSerial = pointerButtonSerial(button);
    d->updatePointerButtonSerial(button, serial);
    d->updatePointerButtonState(button, Private::Pointer::State::Released);
    if (d->drag.mode == Private::Drag::Mode::Pointer) {
        if (d->drag.source->dragImplicitGrabSerial() != currentButtonSerial) {
            // not our drag button - ignore
            return;
        }
        d->endDrag(serial);
        return;
    }
    if (d->globalPointer.focus.surface) {
        for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
            (*it)->buttonReleased(button, serial);
        }
    }
}

quint32 SeatInterface::pointerButtonSerial(Qt::MouseButton button) const
{
    return pointerButtonSerial(qtToWaylandButton(button));
}

quint32 SeatInterface::pointerButtonSerial(quint32 button) const
{
    Q_D();
    auto it = d->globalPointer.buttonSerials.constFind(button);
    if (it == d->globalPointer.buttonSerials.constEnd()) {
        return 0;
    }
    return it.value();
}

void SeatInterface::relativePointerMotion(const QSizeF &delta, const QSizeF &deltaNonAccelerated, quint64 microseconds)
{
    Q_D();
    if (d->globalPointer.focus.surface) {
        for (auto it = d->globalPointer.focus.pointers.constBegin(), end = d->globalPointer.focus.pointers.constEnd(); it != end; ++it) {
            (*it)->relativeMotion(delta, deltaNonAccelerated, microseconds);
        }
    }
}

void SeatInterface::startPointerSwipeGesture(quint32 fingerCount)
{
    Q_D();
    if (!d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    d->globalPointer.gestureSurface = QPointer<SurfaceInterface>(d->globalPointer.focus.surface);
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial, fingerCount] (PointerInterface *p) {
            p->d_func()->startSwipeGesture(serial, fingerCount);
        }
    );
}

void SeatInterface::updatePointerSwipeGesture(const QSizeF &delta)
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [delta] (PointerInterface *p) {
            p->d_func()->updateSwipeGesture(delta);
        }
    );
}

void SeatInterface::endPointerSwipeGesture()
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial] (PointerInterface *p) {
            p->d_func()->endSwipeGesture(serial);
        }
    );
    d->globalPointer.gestureSurface.clear();
}

void SeatInterface::cancelPointerSwipeGesture()
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial] (PointerInterface *p) {
            p->d_func()->cancelSwipeGesture(serial);
        }
    );
    d->globalPointer.gestureSurface.clear();
}

void SeatInterface::startPointerPinchGesture(quint32 fingerCount)
{
    Q_D();
    if (!d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    d->globalPointer.gestureSurface = QPointer<SurfaceInterface>(d->globalPointer.focus.surface);
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial, fingerCount] (PointerInterface *p) {
            p->d_func()->startPinchGesture(serial, fingerCount);
        }
    );
}

void SeatInterface::updatePointerPinchGesture(const QSizeF &delta, qreal scale, qreal rotation)
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [delta, scale, rotation] (PointerInterface *p) {
            p->d_func()->updatePinchGesture(delta, scale, rotation);
        }
    );
}

void SeatInterface::endPointerPinchGesture()
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial] (PointerInterface *p) {
            p->d_func()->endPinchGesture(serial);
        }
    );
    d->globalPointer.gestureSurface.clear();
}

void SeatInterface::cancelPointerPinchGesture()
{
    Q_D();
    if (d->globalPointer.gestureSurface.isNull()) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    forEachInterface<PointerInterface>(d->globalPointer.gestureSurface.data(), d->pointers,
        [serial] (PointerInterface *p) {
            p->d_func()->cancelPinchGesture(serial);
        }
    );
    d->globalPointer.gestureSurface.clear();
}

void SeatInterface::keyPressed(quint32 key)
{
    Q_D();
    d->keys.lastStateSerial = d->display->nextSerial();
    if (!d->updateKey(key, Private::Keyboard::State::Pressed)) {
        return;
    }
    if (d->keys.focus.surface) {
        for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
            (*it)->keyPressed(key, d->keys.lastStateSerial);
        }
    }
}

void SeatInterface::keyReleased(quint32 key)
{
    Q_D();
    d->keys.lastStateSerial = d->display->nextSerial();
    if (!d->updateKey(key, Private::Keyboard::State::Released)) {
        return;
    }
    if (d->keys.focus.surface) {
        for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
            (*it)->keyReleased(key, d->keys.lastStateSerial);
        }
    }
}

SurfaceInterface *SeatInterface::focusedKeyboardSurface() const
{
    Q_D();
    return d->keys.focus.surface;
}

void SeatInterface::setFocusedKeyboardSurface(SurfaceInterface *surface)
{
    Q_D();
    const quint32 serial = d->display->nextSerial();
    for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
        (*it)->setFocusedSurface(nullptr, serial);
    }
    if (d->keys.focus.surface) {
        disconnect(d->keys.focus.destroyConnection);
    }
    d->keys.focus = Private::Keyboard::Focus();
    d->keys.focus.surface = surface;
    d->keys.focus.keyboards = d->keyboardsForSurface(surface);
    if (d->keys.focus.surface) {
        d->keys.focus.destroyConnection = connect(surface, &QObject::destroyed, this,
            [this] {
                Q_D();
                d->keys.focus = Private::Keyboard::Focus();
            }
        );
        d->keys.focus.serial = serial;
        // selection?
        d->keys.focus.selection = d->dataDeviceForSurface(surface);
        if (d->keys.focus.selection) {
            if (d->currentSelection && d->currentSelection->selection()) {
                d->keys.focus.selection->sendSelection(d->currentSelection);
            } else {
                d->keys.focus.selection->sendClearSelection();
            }
        }
    }
    for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
        (*it)->setFocusedSurface(surface, serial);
    }
    // focused text input surface follows keyboard
    if (hasKeyboard()) {
        setFocusedTextInputSurface(surface);
    }
}

void SeatInterface::setKeymap(int fd, quint32 size)
{
    Q_D();
    d->keys.keymap.xkbcommonCompatible = true;
    d->keys.keymap.fd = fd;
    d->keys.keymap.size = size;
    for (auto it = d->keyboards.constBegin(); it != d->keyboards.constEnd(); ++it) {
        (*it)->setKeymap(fd, size);
    }
}

void SeatInterface::updateKeyboardModifiers(quint32 depressed, quint32 latched, quint32 locked, quint32 group)
{
    Q_D();
    bool changed = false;
#define UPDATE( value ) \
    if (d->keys.modifiers.value != value) { \
        d->keys.modifiers.value = value; \
        changed = true; \
    }
    UPDATE(depressed)
    UPDATE(latched)
    UPDATE(locked)
    UPDATE(group)
    if (!changed) {
        return;
    }
    const quint32 serial = d->display->nextSerial();
    d->keys.modifiers.serial = serial;
    if (d->keys.focus.surface) {
        for (auto it = d->keys.focus.keyboards.constBegin(), end = d->keys.focus.keyboards.constEnd(); it != end; ++it) {
            (*it)->updateModifiers(depressed, latched, locked, group, serial);
        }
    }
}

void SeatInterface::setKeyRepeatInfo(qint32 charactersPerSecond, qint32 delay)
{
    Q_D();
    d->keys.keyRepeat.charactersPerSecond = qMax(charactersPerSecond, 0);
    d->keys.keyRepeat.delay = qMax(delay, 0);
    for (auto it = d->keyboards.constBegin(); it != d->keyboards.constEnd(); ++it) {
        (*it)->repeatInfo(d->keys.keyRepeat.charactersPerSecond, d->keys.keyRepeat.delay);
    }
}

qint32 SeatInterface::keyRepeatDelay() const
{
    Q_D();
    return d->keys.keyRepeat.delay;
}

qint32 SeatInterface::keyRepeatRate() const
{
    Q_D();
    return d->keys.keyRepeat.charactersPerSecond;
}

bool SeatInterface::isKeymapXkbCompatible() const
{
    Q_D();
    return d->keys.keymap.xkbcommonCompatible;
}

int SeatInterface::keymapFileDescriptor() const
{
    Q_D();
    return d->keys.keymap.fd;
}

quint32 SeatInterface::keymapSize() const
{
    Q_D();
    return d->keys.keymap.size;
}

quint32 SeatInterface::depressedModifiers() const
{
    Q_D();
    return d->keys.modifiers.depressed;
}

quint32 SeatInterface::groupModifiers() const
{
    Q_D();
    return d->keys.modifiers.group;
}

quint32 SeatInterface::latchedModifiers() const
{
    Q_D();
    return d->keys.modifiers.latched;
}

quint32 SeatInterface::lockedModifiers() const
{
    Q_D();
    return d->keys.modifiers.locked;
}

quint32 SeatInterface::lastModifiersSerial() const
{
    Q_D();
    return d->keys.modifiers.serial;
}

QVector< quint32 > SeatInterface::pressedKeys() const
{
    Q_D();
    QVector<quint32> keys;
    for (auto it = d->keys.states.constBegin(); it != d->keys.states.constEnd(); ++it) {
        if (it.value() == Private::Keyboard::State::Pressed) {
            keys << it.key();
        }
    }
    return keys;
}

KeyboardInterface *SeatInterface::focusedKeyboard() const
{
    Q_D();
    if (d->keys.focus.keyboards.isEmpty()) {
        return nullptr;
    }
    return d->keys.focus.keyboards.first();
}

void SeatInterface::cancelTouchSequence()
{
    Q_D();
    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
        (*it)->cancel();
    }
    if (d->drag.mode == Private::Drag::Mode::Touch) {
        // cancel the drag, don't drop.
        if (d->drag.target) {
            // remove the current target
            d->drag.target->updateDragTarget(nullptr, 0);
            d->drag.target = nullptr;
        }
        // and end the drag for the source, serial does not matter
        d->endDrag(0);
    }
    d->globalTouch.ids.clear();
}

TouchInterface *SeatInterface::focusedTouch() const
{
    Q_D();
    if (d->globalTouch.focus.touchs.isEmpty()) {
        return nullptr;
    }
    return d->globalTouch.focus.touchs.first();
}

SurfaceInterface *SeatInterface::focusedTouchSurface() const
{
    Q_D();
    return d->globalTouch.focus.surface;
}

QPointF SeatInterface::focusedTouchSurfacePosition() const
{
    Q_D();
    return d->globalTouch.focus.offset;
}

bool SeatInterface::isTouchSequence() const
{
    Q_D();
    return !d->globalTouch.ids.isEmpty();
}

void SeatInterface::setFocusedTouchSurface(SurfaceInterface *surface, const QPointF &surfacePosition)
{
    if (isTouchSequence()) {
        // changing surface not allowed during a touch sequence
        return;
    }
    Q_ASSERT(!isDragTouch());
    Q_D();
    if (d->globalTouch.focus.surface) {
        disconnect(d->globalTouch.focus.destroyConnection);
    }
    d->globalTouch.focus = Private::Touch::Focus();
    d->globalTouch.focus.surface = surface;
    d->globalTouch.focus.offset = surfacePosition;
    d->globalTouch.focus.touchs = d->touchsForSurface(surface);
    if (d->globalTouch.focus.surface) {
        d->globalTouch.focus.destroyConnection = connect(surface, &QObject::destroyed, this,
            [this] {
                Q_D();
                if (isTouchSequence()) {
                    // Surface destroyed during touch sequence - send a cancel
                    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
                        (*it)->cancel();
                    }
                }
                d->globalTouch.focus = Private::Touch::Focus();
            }
        );
    }
}

void SeatInterface::setFocusedTouchSurfacePosition(const QPointF &surfacePosition)
{
    Q_D();
    d->globalTouch.focus.offset = surfacePosition;
}

qint32 SeatInterface::touchDown(const QPointF &globalPosition)
{
    Q_D();
    const qint32 id = d->globalTouch.ids.isEmpty() ? 0 : d->globalTouch.ids.lastKey() + 1;
    const qint32 serial = display()->nextSerial();
    const auto pos = globalPosition - d->globalTouch.focus.offset;
    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
        (*it)->down(id, serial, pos);
    }

    if (id == 0) {
        d->globalTouch.focus.firstTouchPos = globalPosition;
    }

#if HAVE_LINUX_INPUT_H
    if (id == 0 && d->globalTouch.focus.touchs.isEmpty()) {
        // If the client did not bind the touch interface fall back
        // to at least emulating touch through pointer events.
        forEachInterface<PointerInterface>(focusedTouchSurface(), d->pointers,
            [this, pos, serial] (PointerInterface *p) {
                wl_pointer_send_enter(p->resource(), serial,
                                focusedTouchSurface()->resource(),
                                wl_fixed_from_double(pos.x()), wl_fixed_from_double(pos.y()));
                wl_pointer_send_motion(p->resource(), timestamp(),
                                        wl_fixed_from_double(pos.x()), wl_fixed_from_double(pos.y()));

                wl_pointer_send_button(p->resource(), serial, timestamp(), BTN_LEFT, WL_POINTER_BUTTON_STATE_PRESSED);
                p->d_func()->sendFrame();
            }
        );
    }
#endif

    d->globalTouch.ids[id] = serial;
    return id;
}

void SeatInterface::touchMove(qint32 id, const QPointF &globalPosition)
{
    Q_D();
    Q_ASSERT(d->globalTouch.ids.contains(id));
    const auto pos = globalPosition - d->globalTouch.focus.offset;
    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
        (*it)->move(id, pos);
    }

    if (id == 0) {
        d->globalTouch.focus.firstTouchPos = globalPosition;
    }

    if (id == 0 && d->globalTouch.focus.touchs.isEmpty()) {
        // Client did not bind touch, fall back to emulating with pointer events.
        forEachInterface<PointerInterface>(focusedTouchSurface(), d->pointers,
            [this, pos] (PointerInterface *p) {
                wl_pointer_send_motion(p->resource(), timestamp(),
                                       wl_fixed_from_double(pos.x()), wl_fixed_from_double(pos.y()));
            }
        );
    }
    emit touchMoved(id, d->globalTouch.ids[id], globalPosition);
}

void SeatInterface::touchUp(qint32 id)
{
    Q_D();
    Q_ASSERT(d->globalTouch.ids.contains(id));
    const qint32 serial = display()->nextSerial();
    if (d->drag.mode == Private::Drag::Mode::Touch &&
            d->drag.source->dragImplicitGrabSerial() == d->globalTouch.ids.value(id)) {
        // the implicitly grabbing touch point has been upped
        d->endDrag(serial);
    }
    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
        (*it)->up(id, serial);
    }

#if HAVE_LINUX_INPUT_H
    if (id == 0 && d->globalTouch.focus.touchs.isEmpty()) {
        // Client did not bind touch, fall back to emulating with pointer events.
        const quint32 serial = display()->nextSerial();
        forEachInterface<PointerInterface>(focusedTouchSurface(), d->pointers,
            [this, serial] (PointerInterface *p) {
                wl_pointer_send_button(p->resource(), serial, timestamp(), BTN_LEFT, WL_POINTER_BUTTON_STATE_RELEASED);
            }
        );
    }
#endif

    d->globalTouch.ids.remove(id);
}

void SeatInterface::touchFrame()
{
    Q_D();
    for (auto it = d->globalTouch.focus.touchs.constBegin(), end = d->globalTouch.focus.touchs.constEnd(); it != end; ++it) {
        (*it)->frame();
    }
}

bool SeatInterface::hasImplicitTouchGrab(quint32 serial) const
{
    Q_D();
    if (!d->globalTouch.focus.surface) {
        // origin surface has been destroyed
        return false;
    }
    return d->globalTouch.ids.key(serial, -1) != -1;
}

bool SeatInterface::isDrag() const
{
    Q_D();
    return d->drag.mode != Private::Drag::Mode::None;
}

bool SeatInterface::isDragPointer() const
{
    Q_D();
    return d->drag.mode == Private::Drag::Mode::Pointer;
}

bool SeatInterface::isDragTouch() const
{
    Q_D();
    return d->drag.mode == Private::Drag::Mode::Touch;
}

bool SeatInterface::hasImplicitPointerGrab(quint32 serial) const
{
    Q_D();
    const auto &serials = d->globalPointer.buttonSerials;
    for (auto it = serials.constBegin(), end = serials.constEnd(); it != end; it++) {
        if (it.value() == serial) {
            return isPointerButtonPressed(it.key());
        }
    }
    return false;
}

QMatrix4x4 SeatInterface::dragSurfaceTransformation() const
{
    Q_D();
    return d->drag.transformation;
}

SurfaceInterface *SeatInterface::dragSurface() const
{
    Q_D();
    return d->drag.surface;
}

PointerInterface *SeatInterface::dragPointer() const
{
    Q_D();
    if (d->drag.mode != Private::Drag::Mode::Pointer) {
        return nullptr;
    }

    return d->drag.sourcePointer;
}

DataDeviceInterface *SeatInterface::dragSource() const
{
    Q_D();
    return d->drag.source;
}

void SeatInterface::setFocusedTextInputSurface(SurfaceInterface *surface)
{
    Q_D();
    const quint32 serial = d->display->nextSerial();
    const auto old = d->textInput.focus.textInput;
    if (d->textInput.focus.textInput) {
        // TODO: setFocusedSurface like in other interfaces
        d->textInput.focus.textInput->d_func()->sendLeave(serial, d->textInput.focus.surface);
    }
    if (d->textInput.focus.surface) {
        disconnect(d->textInput.focus.destroyConnection);
    }
    d->textInput.focus = Private::TextInput::Focus();
    d->textInput.focus.surface = surface;
    TextInputInterface *t = d->textInputForSurface(surface);
    if (t && !t->resource()) {
        t = nullptr;
    }
    d->textInput.focus.textInput = t;
    if (d->textInput.focus.surface) {
        d->textInput.focus.destroyConnection = connect(surface, &Resource::aboutToBeUnbound, this,
            [this] {
                setFocusedTextInputSurface(nullptr);
            }
        );
        d->textInput.focus.serial = serial;
    }
    if (t) {
        // TODO: setFocusedSurface like in other interfaces
        t->d_func()->sendEnter(surface, serial);
    }
    if (old != t) {
        emit focusedTextInputChanged();
    }
}

SurfaceInterface *SeatInterface::focusedTextInputSurface() const
{
    Q_D();
    return d->textInput.focus.surface;
}

TextInputInterface *SeatInterface::focusedTextInput() const
{
    Q_D();
    return d->textInput.focus.textInput;
}

DataDeviceInterface *SeatInterface::selection() const
{
    Q_D();
    return d->currentSelection;
}

void SeatInterface::setSelection(DataDeviceInterface *dataDevice)
{
    Q_D();
    if (d->currentSelection == dataDevice) {
        return;
    }
    // cancel the previous selection
    d->cancelPreviousSelection(dataDevice);
    d->currentSelection = dataDevice;
    if (d->keys.focus.selection) {
        if (dataDevice && dataDevice->selection()) {
            d->keys.focus.selection->sendSelection(dataDevice);
        } else {
            d->keys.focus.selection->sendClearSelection();
        }
    }
    emit selectionChanged(dataDevice);
}

}
}
