/********************************************************************
Copyright 2016  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/>.
*********************************************************************/
// Qt
#include <QtTest/QtTest>
// KWin
#include "../../src/client/compositor.h"
#include "../../src/client/connection_thread.h"
#include "../../src/client/datadevice.h"
#include "../../src/client/datadevicemanager.h"
#include "../../src/client/datasource.h"
#include "../../src/client/event_queue.h"
#include "../../src/client/pointer.h"
#include "../../src/client/registry.h"
#include "../../src/client/seat.h"
#include "../../src/client/shell.h"
#include "../../src/client/shm_pool.h"
#include "../../src/client/surface.h"
#include "../../src/server/display.h"
#include "../../src/server/compositor_interface.h"
#include "../../src/server/datadevicemanager_interface.h"
#include "../../src/server/seat_interface.h"
#include "../../src/server/shell_interface.h"

class TestDragAndDrop : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void init();
    void cleanup();

    void testDragAndDrop();
    void testPointerEventsIgnored();

private:
    KWayland::Client::Surface *createSurface();
    KWayland::Server::SurfaceInterface *getServerSurface();

    KWayland::Server::Display *m_display = nullptr;
    KWayland::Server::CompositorInterface *m_compositorInterface = nullptr;
    KWayland::Server::DataDeviceManagerInterface *m_dataDeviceManagerInterface = nullptr;
    KWayland::Server::SeatInterface *m_seatInterface = nullptr;
    KWayland::Server::ShellInterface *m_shellInterface = nullptr;
    KWayland::Client::ConnectionThread *m_connection = nullptr;
    KWayland::Client::Compositor *m_compositor = nullptr;
    KWayland::Client::EventQueue *m_queue = nullptr;
    KWayland::Client::DataDevice *m_dataDevice = nullptr;
    KWayland::Client::DataSource *m_dataSource = nullptr;
    QThread *m_thread = nullptr;
    KWayland::Client::Registry *m_registry = nullptr;
    KWayland::Client::Seat *m_seat = nullptr;
    KWayland::Client::Pointer *m_pointer = nullptr;
    KWayland::Client::DataDeviceManager *m_ddm = nullptr;
    KWayland::Client::ShmPool *m_shm = nullptr;
    KWayland::Client::Shell *m_shell = nullptr;
};

static const QString s_socketName = QStringLiteral("kwayland-test-wayland-drag-n-drop-0");

void TestDragAndDrop::init()
{
    using namespace KWayland::Server;
    using namespace KWayland::Client;
    delete m_display;
    m_display = new Display(this);
    m_display->setSocketName(s_socketName);
    m_display->start();
    QVERIFY(m_display->isRunning());

    // setup connection
    m_connection = new KWayland::Client::ConnectionThread;
    QSignalSpy connectedSpy(m_connection, &ConnectionThread::connected);
    QVERIFY(connectedSpy.isValid());
    m_connection->setSocketName(s_socketName);

    m_compositorInterface = m_display->createCompositor(m_display);
    m_compositorInterface->create();
    QVERIFY(m_compositorInterface->isValid());
    m_seatInterface = m_display->createSeat(m_display);
    m_seatInterface->setHasPointer(true);
    m_seatInterface->create();
    QVERIFY(m_seatInterface->isValid());
    m_dataDeviceManagerInterface = m_display->createDataDeviceManager(m_display);
    m_dataDeviceManagerInterface->create();
    QVERIFY(m_dataDeviceManagerInterface->isValid());
    m_display->createShm();
    m_shellInterface = m_display->createShell(m_display);
    m_shellInterface->create();

    m_thread = new QThread(this);
    m_connection->moveToThread(m_thread);
    m_thread->start();

    m_connection->initConnection();
    QVERIFY(connectedSpy.wait());

    m_queue = new EventQueue(this);
    QVERIFY(!m_queue->isValid());
    m_queue->setup(m_connection);
    QVERIFY(m_queue->isValid());

    m_registry = new Registry();
    QSignalSpy interfacesAnnouncedSpy(m_registry, &Registry::interfaceAnnounced);
    QVERIFY(interfacesAnnouncedSpy.isValid());

    QVERIFY(!m_registry->eventQueue());
    m_registry->setEventQueue(m_queue);
    QCOMPARE(m_registry->eventQueue(), m_queue);
    m_registry->create(m_connection);
    QVERIFY(m_registry->isValid());
    m_registry->setup();

    QVERIFY(interfacesAnnouncedSpy.wait());
#define CREATE(variable, factory, iface) \
    variable = m_registry->create##factory(m_registry->interface(Registry::Interface::iface).name, m_registry->interface(Registry::Interface::iface).version, this); \
    QVERIFY(variable);

    CREATE(m_compositor, Compositor, Compositor)
    CREATE(m_seat, Seat, Seat)
    CREATE(m_ddm, DataDeviceManager, DataDeviceManager)
    CREATE(m_shm, ShmPool, Shm)
    CREATE(m_shell, Shell, Shell)

#undef CREATE

    QSignalSpy pointerSpy(m_seat, &Seat::hasPointerChanged);
    QVERIFY(pointerSpy.isValid());
    QVERIFY(pointerSpy.wait());
    m_pointer = m_seat->createPointer(m_seat);
    QVERIFY(m_pointer->isValid());
    m_dataDevice = m_ddm->getDataDevice(m_seat, this);
    QVERIFY(m_dataDevice->isValid());
    m_dataSource = m_ddm->createDataSource(this);
    QVERIFY(m_dataSource->isValid());
    m_dataSource->offer(QStringLiteral("text/plain"));
}

void TestDragAndDrop::cleanup()
{
#define DELETE(name) \
    if (name) { \
        delete name; \
        name = nullptr; \
    }
    DELETE(m_dataSource)
    DELETE(m_dataDevice)
    DELETE(m_shell)
    DELETE(m_shm)
    DELETE(m_compositor)
    DELETE(m_ddm)
    DELETE(m_seat)
    DELETE(m_queue)
    DELETE(m_registry)
#undef DELETE
    if (m_thread) {
        m_thread->quit();
        m_thread->wait();
        delete m_thread;
        m_thread = nullptr;
    }
    delete m_connection;
    m_connection = nullptr;

    delete m_display;
    m_display = nullptr;
}

KWayland::Client::Surface *TestDragAndDrop::createSurface()
{
    using namespace KWayland::Client;
    auto s = m_compositor->createSurface();

    QImage img(QSize(100, 200), QImage::Format_ARGB32);
    img.fill(Qt::red);
    s->attachBuffer(m_shm->createBuffer(img));
    s->damage(QRect(0, 0, 100, 200));
    s->commit(Surface::CommitFlag::None);
    return s;
}

KWayland::Server::SurfaceInterface *TestDragAndDrop::getServerSurface()
{
    using namespace KWayland::Server;
    QSignalSpy surfaceCreatedSpy(m_compositorInterface, &CompositorInterface::surfaceCreated);
    if (!surfaceCreatedSpy.isValid()) {
        return nullptr;
    }
    if (!surfaceCreatedSpy.wait()) {
        return nullptr;
    }
    return surfaceCreatedSpy.first().first().value<SurfaceInterface*>();
}

void TestDragAndDrop::testDragAndDrop()
{
    // this test verifies the very basic drag and drop on one surface, an enter, a move and the drop
    using namespace KWayland::Server;
    using namespace KWayland::Client;
    // first create a window
    QScopedPointer<Surface> s(createSurface());
    auto serverSurface = getServerSurface();
    QVERIFY(serverSurface);

    // now we need to pass pointer focus to the Surface and simulate a button press
    QSignalSpy buttonPressSpy(m_pointer, &Pointer::buttonStateChanged);
    QVERIFY(buttonPressSpy.isValid());
    m_seatInterface->setFocusedPointerSurface(serverSurface);
    m_seatInterface->setTimestamp(2);
    m_seatInterface->pointerButtonPressed(1);
    QVERIFY(buttonPressSpy.wait());
    QCOMPARE(buttonPressSpy.first().at(1).value<quint32>(), quint32(2));

    // add some signal spies for client side
    QSignalSpy dragEnteredSpy(m_dataDevice, &DataDevice::dragEntered);
    QVERIFY(dragEnteredSpy.isValid());
    QSignalSpy dragMotionSpy(m_dataDevice, &DataDevice::dragMotion);
    QVERIFY(dragMotionSpy.isValid());
    QSignalSpy pointerMotionSpy(m_pointer, &Pointer::motion);
    QVERIFY(pointerMotionSpy.isValid());

    // now we can start the drag and drop
    QSignalSpy dragStartedSpy(m_seatInterface, &SeatInterface::dragStarted);
    QVERIFY(dragStartedSpy.isValid());
    m_dataDevice->startDrag(buttonPressSpy.first().first().value<quint32>(), m_dataSource, s.data());
    QVERIFY(dragStartedSpy.wait());
    QCOMPARE(m_seatInterface->dragSurface(), serverSurface);
    QCOMPARE(m_seatInterface->dragSurfaceTransformation(), QMatrix4x4());
    QVERIFY(!m_seatInterface->dragSource()->icon());
    QCOMPARE(m_seatInterface->dragSource()->dragImplicitGrabSerial(), buttonPressSpy.first().first().value<quint32>());
    QVERIFY(dragEnteredSpy.wait());
    QCOMPARE(dragEnteredSpy.count(), 1);
    QCOMPARE(dragEnteredSpy.first().first().value<quint32>(), m_display->serial());
    QCOMPARE(dragEnteredSpy.first().last().toPointF(), QPointF(0, 0));
    QCOMPARE(m_dataDevice->dragSurface().data(), s.data());
    QCOMPARE(m_dataDevice->dragOffer()->offeredMimeTypes().count(), 1);
    QCOMPARE(m_dataDevice->dragOffer()->offeredMimeTypes().first().name(), QStringLiteral("text/plain"));

    // simulate motion
    m_seatInterface->setTimestamp(3);
    m_seatInterface->setPointerPos(QPointF(3, 3));
    QVERIFY(dragMotionSpy.wait());
    QCOMPARE(dragMotionSpy.count(), 1);
    QCOMPARE(dragMotionSpy.first().first().toPointF(), QPointF(3, 3));
    QCOMPARE(dragMotionSpy.first().last().toUInt(), 3u);

    // simulate drop
    QSignalSpy leftSpy(m_dataDevice, &DataDevice::dragLeft);
    QVERIFY(leftSpy.isValid());
    QSignalSpy serverDragEndedSpy(m_seatInterface, &SeatInterface::dragEnded);
    QVERIFY(serverDragEndedSpy.isValid());
    QSignalSpy droppedSpy(m_dataDevice, &DataDevice::dropped);
    QVERIFY(droppedSpy.isValid());
    m_seatInterface->setTimestamp(4);
    m_seatInterface->pointerButtonReleased(1);
    QVERIFY(droppedSpy.wait());
    QCOMPARE(leftSpy.count(), 1);
    QCOMPARE(serverDragEndedSpy.count(), 1);

    // verify that we did not get any further input events
    QVERIFY(pointerMotionSpy.isEmpty());
    QCOMPARE(buttonPressSpy.count(), 1);
}

void TestDragAndDrop::testPointerEventsIgnored()
{
    // this test verifies that all pointer events are ignored on the focused Pointer device during drag
    using namespace KWayland::Server;
    using namespace KWayland::Client;
    // first create a window
    QScopedPointer<Surface> s(createSurface());
    auto serverSurface = getServerSurface();
    QVERIFY(serverSurface);

    // pass it pointer focus
    m_seatInterface->setFocusedPointerSurface(serverSurface);

    // create signal spies for all the pointer events
    QSignalSpy pointerEnteredSpy(m_pointer, &Pointer::entered);
    QVERIFY(pointerEnteredSpy.isValid());
    QSignalSpy pointerLeftSpy(m_pointer, &Pointer::left);
    QVERIFY(pointerLeftSpy.isValid());
    QSignalSpy pointerMotionSpy(m_pointer, &Pointer::motion);
    QVERIFY(pointerMotionSpy.isValid());
    QSignalSpy axisSpy(m_pointer, &Pointer::axisChanged);
    QVERIFY(axisSpy.isValid());
    QSignalSpy buttonSpy(m_pointer, &Pointer::buttonStateChanged);
    QVERIFY(buttonSpy.isValid());
    QSignalSpy dragEnteredSpy(m_dataDevice, &DataDevice::dragEntered);
    QVERIFY(dragEnteredSpy.isValid());

    // first simulate a few things
    quint32 timestamp = 1;
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->setPointerPos(QPointF(10, 10));
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerAxis(Qt::Vertical, 5);
    // verify that we have those
    QVERIFY(axisSpy.wait());
    QCOMPARE(axisSpy.count(), 1);
    QCOMPARE(pointerMotionSpy.count(), 1);
    QCOMPARE(pointerEnteredSpy.count(), 1);
    QVERIFY(buttonSpy.isEmpty());
    QVERIFY(pointerLeftSpy.isEmpty());

    // let's start the drag
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerButtonPressed(1);
    QVERIFY(buttonSpy.wait());
    QCOMPARE(buttonSpy.count(), 1);
    m_dataDevice->startDrag(buttonSpy.first().first().value<quint32>(), m_dataSource, s.data());
    QVERIFY(dragEnteredSpy.wait());

    // now simulate all the possible pointer interactions
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerButtonPressed(2);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerButtonReleased(2);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerAxis(Qt::Vertical, 5);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerAxis(Qt::Horizontal, 5);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->setFocusedPointerSurface(nullptr);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->setFocusedPointerSurface(serverSurface);
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->setPointerPos(QPointF(50, 50));

    // last but not least, simulate the drop
    QSignalSpy droppedSpy(m_dataDevice, &DataDevice::dropped);
    QVERIFY(droppedSpy.isValid());
    m_seatInterface->setTimestamp(timestamp++);
    m_seatInterface->pointerButtonReleased(1);
    QVERIFY(droppedSpy.wait());

    // all the changes should have been ignored
    QCOMPARE(axisSpy.count(), 1);
    QCOMPARE(pointerMotionSpy.count(), 1);
    QCOMPARE(pointerEnteredSpy.count(), 1);
    QCOMPARE(buttonSpy.count(), 1);
    QVERIFY(pointerLeftSpy.isEmpty());
}

QTEST_GUILESS_MAIN(TestDragAndDrop)
#include "test_drag_drop.moc"