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

Copyright (C) 2018 Vlad Zagorodniy <vladzzag@gmail.com>

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_client.h"
#include "composite.h"
#include "deleted.h"
#include "effectloader.h"
#include "effects.h"
#include "platform.h"
#include "screens.h"
#include "xdgshellclient.h"
#include "wayland_server.h"
#include "workspace.h"

#include "effect_builtins.h"

#include <KWayland/Client/surface.h>
#include <KWayland/Client/xdgshell.h>

namespace KWin
{

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

class DontCrashReinitializeCompositorTest : public QObject
{
    Q_OBJECT

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

    void testReinitializeCompositor_data();
    void testReinitializeCompositor();
};

void DontCrashReinitializeCompositorTest::initTestCase()
{
    qputenv("XDG_DATA_DIRS", QCoreApplication::applicationDirPath().toUtf8());

    qRegisterMetaType<KWin::AbstractClient *>();
    qRegisterMetaType<KWin::Deleted *>();
    qRegisterMetaType<KWin::XdgShellClient *>();
    QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);
    QVERIFY(workspaceCreatedSpy.isValid());
    kwinApp()->platform()->setInitialWindowSize(QSize(1280, 1024));
    QVERIFY(waylandServer()->init(s_socketName.toLocal8Bit()));
    QMetaObject::invokeMethod(kwinApp()->platform(), "setVirtualOutputs", Qt::DirectConnection, Q_ARG(int, 2));

    auto config = KSharedConfig::openConfig(QString(), KConfig::SimpleConfig);
    KConfigGroup plugins(config, QStringLiteral("Plugins"));
    ScriptedEffectLoader loader;
    const auto builtinNames = BuiltInEffects::availableEffectNames() << loader.listOfKnownEffects();
    for (const QString &name : builtinNames) {
        plugins.writeEntry(name + QStringLiteral("Enabled"), false);
    }
    config->sync();
    kwinApp()->setConfig(config);

    qputenv("KWIN_COMPOSE", QByteArrayLiteral("O2"));
    qputenv("KWIN_EFFECTS_FORCE_ANIMATIONS", QByteArrayLiteral("1"));

    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));
    waylandServer()->initWorkspace();

    auto scene = KWin::Compositor::self()->scene();
    QVERIFY(scene);
    QCOMPARE(scene->compositingType(), KWin::OpenGL2Compositing);
}

void DontCrashReinitializeCompositorTest::init()
{
    QVERIFY(Test::setupWaylandConnection());
}

void DontCrashReinitializeCompositorTest::cleanup()
{
    // Unload all effects.
    auto effectsImpl = qobject_cast<EffectsHandlerImpl *>(effects);
    QVERIFY(effectsImpl);
    effectsImpl->unloadAllEffects();
    QVERIFY(effectsImpl->loadedEffects().isEmpty());

    Test::destroyWaylandConnection();
}

void DontCrashReinitializeCompositorTest::testReinitializeCompositor_data()
{
    QTest::addColumn<QString>("effectName");

    QTest::newRow("Fade")   << QStringLiteral("kwin4_effect_fade");
    QTest::newRow("Glide")  << QStringLiteral("glide");
    QTest::newRow("Scale")  << QStringLiteral("kwin4_effect_scale");
}

void DontCrashReinitializeCompositorTest::testReinitializeCompositor()
{
    // This test verifies that KWin doesn't crash when the compositor settings
    // have been changed while a scripted effect animates the disappearing of
    // a window.

    // Make sure that we have the right effects ptr.
    auto effectsImpl = qobject_cast<EffectsHandlerImpl *>(effects);
    QVERIFY(effectsImpl);

    // Create the test client.
    using namespace KWayland::Client;

    QScopedPointer<Surface> surface(Test::createSurface());
    QVERIFY(!surface.isNull());
    QScopedPointer<XdgShellSurface> shellSurface(Test::createXdgShellStableSurface(surface.data()));
    QVERIFY(!shellSurface.isNull());
    XdgShellClient *client = Test::renderAndWaitForShown(surface.data(), QSize(100, 50), Qt::blue);
    QVERIFY(client);

    // Make sure that only the test effect is loaded.
    QFETCH(QString, effectName);
    QVERIFY(effectsImpl->loadEffect(effectName));
    QCOMPARE(effectsImpl->loadedEffects().count(), 1);
    QCOMPARE(effectsImpl->loadedEffects().first(), effectName);
    Effect *effect = effectsImpl->findEffect(effectName);
    QVERIFY(effect);
    QVERIFY(!effect->isActive());

    // Close the test client.
    QSignalSpy windowClosedSpy(client, &XdgShellClient::windowClosed);
    QVERIFY(windowClosedSpy.isValid());
    shellSurface.reset();
    surface.reset();
    QVERIFY(windowClosedSpy.wait());

    // The test effect should start animating the test client. Is there a better
    // way to verify that the test effect actually animates the test client?
    QVERIFY(effect->isActive());

    // Re-initialize the compositor, effects will be destroyed and created again.
    Compositor::self()->reinitialize();

    // By this time, KWin should still be alive.
}

} // namespace KWin

WAYLANDTEST_MAIN(KWin::DontCrashReinitializeCompositorTest)
#include "dont_crash_reinitialize_compositor.moc"