/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.

Copyright (C) 2016 Martin Gräßlin <mgraesslin@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "kwin_wayland_test.h"
#include "abstract_backend.h"
#include "abstract_client.h"
#include "cursor.h"
#include "deleted.h"
#include "screenedge.h"
#include "screens.h"
#include "wayland_server.h"
#include "workspace.h"
#include "shell_client.h"
#include <kwineffects.h>

#include <KWayland/Client/connection_thread.h>
#include <KWayland/Client/compositor.h>
#include <KWayland/Client/event_queue.h>
#include <KWayland/Client/registry.h>
#include <KWayland/Client/pointer.h>
#include <KWayland/Client/shell.h>
#include <KWayland/Client/seat.h>
#include <KWayland/Client/shm_pool.h>
#include <KWayland/Client/surface.h>

#include <KWayland/Server/seat_interface.h>

namespace KWin
{

static const QString s_socketName = QStringLiteral("wayland_test_kwin_input_stacking_order-0");

class InputStackingOrderTest : public QObject
{
    Q_OBJECT
private Q_SLOTS:
    void initTestCase();
    void init();
    void cleanup();
    void testPointerFocusUpdatesOnStackingOrderChange();

private:
    void render(KWayland::Client::Surface *surface);
    KWayland::Client::ConnectionThread *m_connection = nullptr;
    KWayland::Client::Compositor *m_compositor = nullptr;
    KWayland::Client::Seat *m_seat = nullptr;
    KWayland::Client::ShmPool *m_shm = nullptr;
    KWayland::Client::Shell *m_shell = nullptr;
    KWayland::Client::EventQueue *m_queue = nullptr;
    QThread *m_thread = nullptr;
};

void InputStackingOrderTest::initTestCase()
{
    qRegisterMetaType<KWin::ShellClient*>();
    qRegisterMetaType<KWin::AbstractClient*>();
    qRegisterMetaType<KWin::Deleted*>();
    QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);
    QVERIFY(workspaceCreatedSpy.isValid());
    waylandServer()->backend()->setInitialWindowSize(QSize(1280, 1024));
    QMetaObject::invokeMethod(waylandServer()->backend(), "setOutputCount", Qt::DirectConnection, Q_ARG(int, 2));
    waylandServer()->init(s_socketName.toLocal8Bit());

    kwinApp()->start();
    QVERIFY(workspaceCreatedSpy.wait());
    QCOMPARE(screens()->count(), 2);
    QCOMPARE(screens()->geometry(0), QRect(0, 0, 1280, 1024));
    QCOMPARE(screens()->geometry(1), QRect(1280, 0, 1280, 1024));
    setenv("QT_QPA_PLATFORM", "wayland", true);
    waylandServer()->initWorkspace();
}

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

    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());

    Registry registry;
    registry.setEventQueue(m_queue);
    QSignalSpy compositorSpy(&registry, &Registry::compositorAnnounced);
    QSignalSpy shmSpy(&registry, &Registry::shmAnnounced);
    QSignalSpy shellSpy(&registry, &Registry::shellAnnounced);
    QSignalSpy seatSpy(&registry, &Registry::seatAnnounced);
    QSignalSpy allAnnounced(&registry, &Registry::interfacesAnnounced);
    QVERIFY(allAnnounced.isValid());
    QVERIFY(shmSpy.isValid());
    QVERIFY(shellSpy.isValid());
    QVERIFY(compositorSpy.isValid());
    QVERIFY(seatSpy.isValid());
    registry.create(m_connection->display());
    QVERIFY(registry.isValid());
    registry.setup();
    QVERIFY(allAnnounced.wait());
    QVERIFY(!compositorSpy.isEmpty());
    QVERIFY(!shmSpy.isEmpty());
    QVERIFY(!shellSpy.isEmpty());
    QVERIFY(!seatSpy.isEmpty());

    m_compositor = registry.createCompositor(compositorSpy.first().first().value<quint32>(), compositorSpy.first().last().value<quint32>(), this);
    QVERIFY(m_compositor->isValid());
    m_shm = registry.createShmPool(shmSpy.first().first().value<quint32>(), shmSpy.first().last().value<quint32>(), this);
    QVERIFY(m_shm->isValid());
    m_shell = registry.createShell(shellSpy.first().first().value<quint32>(), shellSpy.first().last().value<quint32>(), this);
    QVERIFY(m_shell->isValid());
    m_seat = registry.createSeat(seatSpy.first().first().value<quint32>(), seatSpy.first().last().value<quint32>(), this);
    QVERIFY(m_seat->isValid());
    QSignalSpy hasPointerSpy(m_seat, &Seat::hasPointerChanged);
    QVERIFY(hasPointerSpy.isValid());
    QVERIFY(hasPointerSpy.wait());

    screens()->setCurrent(0);
    Cursor::setPos(QPoint(640, 512));
}

void InputStackingOrderTest::cleanup()
{
    delete m_compositor;
    m_compositor = nullptr;
    delete m_seat;
    m_seat = nullptr;
    delete m_shm;
    m_shm = nullptr;
    delete m_shell;
    m_shell = nullptr;
    delete m_queue;
    m_queue = nullptr;
    if (m_thread) {
        m_connection->deleteLater();
        m_thread->quit();
        m_thread->wait();
        delete m_thread;
        m_thread = nullptr;
        m_connection = nullptr;
    }
}

void InputStackingOrderTest::render(KWayland::Client::Surface *surface)
{
    QImage img(QSize(100, 50), QImage::Format_ARGB32);
    img.fill(Qt::blue);
    surface->attachBuffer(m_shm->createBuffer(img));
    surface->damage(QRect(0, 0, 100, 50));
    surface->commit(KWayland::Client::Surface::CommitFlag::None);
    m_connection->flush();
}

void InputStackingOrderTest::testPointerFocusUpdatesOnStackingOrderChange()
{
    // this test creates two windows which overlap
    // the pointer is in the overlapping area which means the top most window has focus
    // as soon as the top most window gets lowered the window should lose focus and the
    // other window should gain focus without a mouse event in between
    using namespace KWayland::Client;
    // create pointer and signal spy for enter and leave signals
    auto pointer = m_seat->createPointer(m_seat);
    QVERIFY(pointer);
    QVERIFY(pointer->isValid());
    QSignalSpy enteredSpy(pointer, &Pointer::entered);
    QVERIFY(enteredSpy.isValid());
    QSignalSpy leftSpy(pointer, &Pointer::left);
    QVERIFY(leftSpy.isValid());

    // now create the two windows and make them overlap
    QSignalSpy clientAddedSpy(waylandServer(), &WaylandServer::shellClientAdded);
    QVERIFY(clientAddedSpy.isValid());
    Surface *surface1 = m_compositor->createSurface(m_compositor);
    QVERIFY(surface1);
    ShellSurface *shellSurface1 = m_shell->createSurface(surface1, surface1);
    QVERIFY(shellSurface1);
    render(surface1);
    QVERIFY(clientAddedSpy.wait());
    AbstractClient *window1 = workspace()->activeClient();
    QVERIFY(window1);

    Surface *surface2 = m_compositor->createSurface(m_compositor);
    QVERIFY(surface2);
    ShellSurface *shellSurface2 = m_shell->createSurface(surface2, surface2);
    QVERIFY(shellSurface2);
    render(surface2);
    QVERIFY(clientAddedSpy.wait());

    AbstractClient *window2 = workspace()->activeClient();
    QVERIFY(window2);
    QVERIFY(window1 != window2);

    // now make windows overlap
    window2->move(window1->pos());
    QCOMPARE(window1->geometry(), window2->geometry());

    // enter
    waylandServer()->backend()->pointerMotion(QPointF(25, 25), 1);
    QVERIFY(enteredSpy.wait());
    QCOMPARE(enteredSpy.count(), 1);
    // window 2 should have focus
    QCOMPARE(pointer->enteredSurface(), surface2);
    // also on the server
    QCOMPARE(waylandServer()->seat()->focusedPointerSurface(), window2->surface());

    // raise window 1 above window 2
    QVERIFY(leftSpy.isEmpty());
    workspace()->raiseClient(window1);
    // should send leave to window2
    QVERIFY(leftSpy.wait());
    QCOMPARE(leftSpy.count(), 1);
    // and an enter to window1
    QCOMPARE(enteredSpy.count(), 2);
    QCOMPARE(pointer->enteredSurface(), surface1);
    QCOMPARE(waylandServer()->seat()->focusedPointerSurface(), window1->surface());

    // let's destroy window1, that should pass focus to window2 again
    QSignalSpy windowClosedSpy(window1, &Toplevel::windowClosed);
    QVERIFY(windowClosedSpy.isValid());
    surface1->deleteLater();
    QVERIFY(windowClosedSpy.wait());
    QVERIFY(enteredSpy.wait());
    QCOMPARE(enteredSpy.count(), 3);
    QCOMPARE(pointer->enteredSurface(), surface2);
    QCOMPARE(waylandServer()->seat()->focusedPointerSurface(), window2->surface());
}

}

WAYLANDTEST_MAIN(KWin::InputStackingOrderTest)
#include "input_stacking_order.moc"