/********************************************************************
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_interface.h"
#include "../../src/server/datacontroldevicemanager_interface.h"
#include "../../src/server/datacontrolsource_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:
    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
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
};


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


// The test itself

class DataControlInterfaceTest : public QObject
{
    Q_OBJECT
public:
    DataControlInterfaceTest()
    {
    }
    ~DataControlInterfaceTest() override;

private Q_SLOTS:
    void initTestCase();
    void testCopyToControl();
    void testCopyFromControl();

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;

    DataControlDeviceManagerInterface *m_dataControlDeviceManagerInterface;

    DataControlDeviceManager *m_dataControlDeviceManager;

    QVector<SurfaceInterface *> m_surfaces;
};

DataControlInterfaceTest::~DataControlInterfaceTest()
{
    if (m_queue) {
        delete m_queue;
        m_queue = nullptr;
    }
    if (m_thread) {
        m_thread->quit();
        m_thread->wait();
        delete m_thread;
        m_thread = nullptr;
    }
    delete m_seat;
    m_connection->deleteLater();
    m_connection = nullptr;
}


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

void DataControlInterfaceTest::initTestCase()
{
    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_serverCompositor->create();
    m_dataControlDeviceManagerInterface = m_display.createDataControlDeviceManager(this);
    QVERIFY(m_serverCompositor->isValid());

    // 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());

    auto registry = new KWayland::Client::Registry(this);
    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);
            m_dataControlDeviceManager->setParent(registry);
        }
    });
    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::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);

    auto testSelection = new TestDataSource;
    m_seat->setSelection(testSelection);

    // 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"}));
    source->destroy();
}


QTEST_GUILESS_MAIN(DataControlInterfaceTest)

#include "test_datacontrol_interface.moc"