/********************************************************************
Copyright 2020 David Edmundson <davidedmundson@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 <QHash>
#include <QThread>
#include <QtTest>

// WaylandServer
#include "../../src/server/compositor_interface.h"
#include "../../src/server/display.h"
#include "../../src/server/seat_interface.h"
#include "../../src/server/datacontroldevice_v1_interface.h"
#include "../../src/server/datacontroldevicemanager_v1_interface.h"
#include "../../src/server/datacontrolsource_v1_interface.h"

#include <KWayland/Client/compositor.h>
#include <KWayland/Client/connection_thread.h>
#include <KWayland/Client/event_queue.h>
#include <KWayland/Client/registry.h>
#include <KWayland/Client/seat.h>

#include "qwayland-wlr-data-control-unstable-v1.h"

using namespace KWaylandServer;

// Faux-client API for tests

Q_DECLARE_OPAQUE_POINTER(::zwlr_data_control_offer_v1*)
Q_DECLARE_METATYPE(::zwlr_data_control_offer_v1*)

class DataControlDeviceManager : public QObject, public QtWayland::zwlr_data_control_manager_v1
{
    Q_OBJECT
};

class DataControlOffer: public QObject, public QtWayland::zwlr_data_control_offer_v1
{
    Q_OBJECT
public:
    ~DataControlOffer() {
        destroy();
    }
    QStringList receivedOffers() {
        return m_receivedOffers;
    }
protected:
    virtual void zwlr_data_control_offer_v1_offer(const QString &mime_type) override {
        m_receivedOffers << mime_type;
    }
private:
    QStringList m_receivedOffers;
};

class DataControlDevice : public QObject, public QtWayland::zwlr_data_control_device_v1
{
    Q_OBJECT
public:
    ~DataControlDevice() {
        destroy();
    }
Q_SIGNALS:
    void dataControlOffer(DataControlOffer *offer); //our event receives a new ID, so we make a new object
    void selection(struct ::zwlr_data_control_offer_v1 *id);
protected:
    void zwlr_data_control_device_v1_data_offer(struct ::zwlr_data_control_offer_v1 *id) override {
        auto offer = new DataControlOffer;
        offer->init(id);
        Q_EMIT dataControlOffer(offer);
    }

    void zwlr_data_control_device_v1_selection(struct ::zwlr_data_control_offer_v1 *id) override {
        Q_EMIT selection(id);
    }
};

class DataControlSource: public QObject, public QtWayland::zwlr_data_control_source_v1
{
    Q_OBJECT
public:
    ~DataControlSource() {
        destroy();
    }
public:
};


class TestDataSource : public AbstractDataSource
{
    Q_OBJECT
public:
    TestDataSource() :
        AbstractDataSource(nullptr)
    {}
    ~TestDataSource() {
        emit aboutToBeDestroyed();
    }
    void requestData(const QString &mimeType, qint32 fd) override {
        Q_UNUSED(mimeType);
        Q_UNUSED(fd);
    };
    void cancel() override {};
    QStringList mimeTypes() const override {
        return {"text/test1", "text/test2"};
    }
};


// The test itself

class DataControlInterfaceTest : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void init();
    void cleanup();
    void testCopyToControl();
    void testCopyFromControl();
    void testKlipperCase();

private:
    KWayland::Client::ConnectionThread *m_connection;
    KWayland::Client::EventQueue *m_queue;
    KWayland::Client::Compositor *m_clientCompositor;
    KWayland::Client::Seat *m_clientSeat = nullptr;

    QThread *m_thread;
    Display *m_display;
    SeatInterface *m_seat;
    CompositorInterface *m_serverCompositor;

    DataControlDeviceManagerV1Interface *m_dataControlDeviceManagerInterface;

    DataControlDeviceManager *m_dataControlDeviceManager;

    QVector<SurfaceInterface *> m_surfaces;
};

static const QString s_socketName = QStringLiteral("kwin-wayland-datacontrol-test-0");

void DataControlInterfaceTest::init()
{
    m_display = new Display;
    m_display->setSocketName(s_socketName);
    m_display->start();
    QVERIFY(m_display->isRunning());

    m_seat = m_display->createSeat(this);
    m_seat->create();
    m_serverCompositor = m_display->createCompositor(this);
    m_dataControlDeviceManagerInterface = m_display->createDataControlDeviceManagerV1(this);

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

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

    m_connection->initConnection();
    QVERIFY(connectedSpy.wait());
    QVERIFY(!m_connection->connections().isEmpty());

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

    KWayland::Client::Registry registry;
    connect(&registry, &KWayland::Client::Registry::interfaceAnnounced, this, [this, &registry](const QByteArray &interface, quint32 name, quint32 version) {
        if (interface == "zwlr_data_control_manager_v1") {
            m_dataControlDeviceManager = new DataControlDeviceManager;
            m_dataControlDeviceManager->init(registry.registry(), name, version);
        }
    });
    connect(&registry, &KWayland::Client::Registry::seatAnnounced, this, [this, &registry](quint32 name, quint32 version) {
        m_clientSeat = registry.createSeat(name, version);
    });
    registry.setEventQueue(m_queue);
    QSignalSpy compositorSpy(&registry, &KWayland::Client::Registry::compositorAnnounced);
    registry.create(m_connection->display());
    QVERIFY(registry.isValid());
    registry.setup();
    wl_display_flush(m_connection->display());

    QVERIFY(compositorSpy.wait());
    m_clientCompositor = registry.createCompositor(compositorSpy.first().first().value<quint32>(), compositorSpy.first().last().value<quint32>(), this);
    QVERIFY(m_clientCompositor->isValid());

    QVERIFY(m_dataControlDeviceManager);
}

void DataControlInterfaceTest::cleanup()
{
#define CLEANUP(variable) \
    if (variable) { \
        delete variable; \
        variable = nullptr; \
    }
    CLEANUP(m_dataControlDeviceManager)
    CLEANUP(m_clientSeat)
    CLEANUP(m_clientCompositor)
    CLEANUP(m_queue)
    if (m_connection) {
        m_connection->deleteLater();
        m_connection = nullptr;
    }
    if (m_thread) {
        m_thread->quit();
        m_thread->wait();
        delete m_thread;
        m_thread = nullptr;
    }
    CLEANUP(m_seat)
    CLEANUP(m_serverCompositor)
    CLEANUP(m_display)
#undef CLEANUP
}

void DataControlInterfaceTest::testCopyToControl()
{
    // we set a dummy data source on the seat using abstract client directly
    // then confirm we receive the offer despite not having a surface

    QScopedPointer<DataControlDevice> dataControlDevice(new DataControlDevice);
    dataControlDevice->init(m_dataControlDeviceManager->get_data_device(*m_clientSeat));

    QSignalSpy newOfferSpy(dataControlDevice.data(), &DataControlDevice::dataControlOffer);
    QSignalSpy selectionSpy(dataControlDevice.data(), &DataControlDevice::selection);

    QScopedPointer<TestDataSource> testSelection(new TestDataSource);
    m_seat->setSelection(testSelection.data());

    // selection will be sent after we've been sent a new offer object and the mimes have been sent to that object
    selectionSpy.wait();

    QCOMPARE(newOfferSpy.count(), 1);
    QScopedPointer<DataControlOffer> offer(newOfferSpy.first().first().value<DataControlOffer*>());
    QCOMPARE(selectionSpy.first().first().value<struct ::zwlr_data_control_offer_v1*>(), offer->object());

    QCOMPARE(offer->receivedOffers().count(), 2);
    QCOMPARE(offer->receivedOffers()[0], "text/test1");
    QCOMPARE(offer->receivedOffers()[1], "text/test2");
}

void DataControlInterfaceTest::testCopyFromControl()
{
    // we create a data device and set a selection
    // then confirm the server sees the new selection
    QSignalSpy serverSelectionChangedSpy(m_seat, &SeatInterface::selectionChanged);

    QScopedPointer<DataControlDevice> dataControlDevice(new DataControlDevice);
    dataControlDevice->init(m_dataControlDeviceManager->get_data_device(*m_clientSeat));

    QScopedPointer<DataControlSource> source(new DataControlSource);
    source->init(m_dataControlDeviceManager->create_data_source());
    source->offer("cheese/test1");
    source->offer("cheese/test2");

    dataControlDevice->set_selection(source->object());

    serverSelectionChangedSpy.wait();
    QVERIFY(m_seat->selection());
    QCOMPARE(m_seat->selection()->mimeTypes(), QStringList({"cheese/test1", "cheese/test2"}));
}

void DataControlInterfaceTest::testKlipperCase()
{
    // This tests the setup of klipper's real world operation and a race with a common pattern seen between clients and klipper
    // The client's behaviour is faked with direct access to the seat

    QScopedPointer<DataControlDevice> dataControlDevice(new DataControlDevice);
    dataControlDevice->init(m_dataControlDeviceManager->get_data_device(*m_clientSeat));

    QSignalSpy newOfferSpy(dataControlDevice.data(), &DataControlDevice::dataControlOffer);
    QSignalSpy selectionSpy(dataControlDevice.data(), &DataControlDevice::selection);
    QSignalSpy serverSelectionChangedSpy(m_seat, &SeatInterface::selectionChanged);

    // Client A has a data source
    QScopedPointer<TestDataSource> testSelection(new TestDataSource);
    m_seat->setSelection(testSelection.data());

    // klipper gets it
    selectionSpy.wait();

    // Client A deletes it
    testSelection.reset();

    //klipper gets told
    selectionSpy.wait();

    // Client A sets something else
    QScopedPointer<TestDataSource> testSelection2(new TestDataSource);
    m_seat->setSelection(testSelection2.data());

    // Meanwhile klipper updates with the old content
    QScopedPointer<DataControlSource> source(new DataControlSource);
    source->init(m_dataControlDeviceManager->create_data_source());
    source->offer("fromKlipper/test1");
    source->offer("application/x-kde-onlyReplaceEmpty");

    dataControlDevice->set_selection(source->object());

    QVERIFY(!serverSelectionChangedSpy.wait(10));
    QCOMPARE(m_seat->selection(), testSelection2.data());
}


QTEST_GUILESS_MAIN(DataControlInterfaceTest)

#include "test_datacontrol_interface.moc"