/********************************************************************
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 "composite.h"
#include "effects.h"
#include "effectloader.h"
#include "cursor.h"
#include "platform.h"
#include "scene_qpainter.h"
#include "shell_client.h"
#include "wayland_server.h"
#include "workspace.h"
#include "effect_builtins.h"

#include <KConfigGroup>

#include <netwm.h>
#include <xcb/xcb_icccm.h>

using namespace KWin;
static const QString s_socketName = QStringLiteral("wayland_test_effects_translucency-0");

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

    void testMoveAfterDesktopChange();

private:
    Effect *m_translucencyEffect = nullptr;
};

void TranslucencyTest::initTestCase()
{
    qRegisterMetaType<KWin::ShellClient*>();
    qRegisterMetaType<KWin::AbstractClient*>();
    qRegisterMetaType<KWin::Effect*>();
    QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);
    QVERIFY(workspaceCreatedSpy.isValid());
    kwinApp()->platform()->setInitialWindowSize(QSize(1280, 1024));
    QVERIFY(waylandServer()->init(s_socketName.toLocal8Bit()));

    // disable all effects - we don't want to have it interact with the rendering
    auto config = KSharedConfig::openConfig(QString(), KConfig::SimpleConfig);
    KConfigGroup plugins(config, QStringLiteral("Plugins"));
    ScriptedEffectLoader loader;
    const auto builtinNames = BuiltInEffects::availableEffectNames() << loader.listOfKnownEffects();
    for (QString name : builtinNames) {
        plugins.writeEntry(name + QStringLiteral("Enabled"), false);
    }
    config->group("Outline").writeEntry(QStringLiteral("QmlPath"), QString("/does/not/exist.qml"));

    config->sync();
    kwinApp()->setConfig(config);

    kwinApp()->start();
    QVERIFY(workspaceCreatedSpy.wait());
    QVERIFY(Compositor::self());
}

void TranslucencyTest::init()
{
    // load the translucency effect
    EffectsHandlerImpl *e = static_cast<EffectsHandlerImpl*>(effects);
    // find the effectsloader
    auto effectloader = e->findChild<AbstractEffectLoader*>();
    QVERIFY(effectloader);
    QSignalSpy effectLoadedSpy(effectloader, &AbstractEffectLoader::effectLoaded);
    QVERIFY(effectLoadedSpy.isValid());

    QVERIFY(!e->isEffectLoaded(QStringLiteral("kwin4_effect_translucency")));
    QVERIFY(e->loadEffect(QStringLiteral("kwin4_effect_translucency")));
    QVERIFY(e->isEffectLoaded(QStringLiteral("kwin4_effect_translucency")));

    QCOMPARE(effectLoadedSpy.count(), 1);
    m_translucencyEffect = effectLoadedSpy.first().first().value<Effect*>();
    QVERIFY(m_translucencyEffect);
}

void TranslucencyTest::cleanup()
{
    EffectsHandlerImpl *e = static_cast<EffectsHandlerImpl*>(effects);
    if (e->isEffectLoaded(QStringLiteral("kwin4_effect_translucency"))) {
        e->unloadEffect(QStringLiteral("kwin4_effect_translucency"));
    }
    QVERIFY(!e->isEffectLoaded(QStringLiteral("kwin4_effect_translucency")));
    m_translucencyEffect = nullptr;
}

void TranslucencyTest::testMoveAfterDesktopChange()
{
    // test tries to simulate the condition of bug 366081
    QVERIFY(!m_translucencyEffect->isActive());

    QSignalSpy windowAddedSpy(effects, &EffectsHandler::windowAdded);
    QVERIFY(windowAddedSpy.isValid());

    // create an xcb window
    struct XcbConnectionDeleter
    {
        static inline void cleanup(xcb_connection_t *pointer)
        {
            xcb_disconnect(pointer);
        }
    };
    QScopedPointer<xcb_connection_t, XcbConnectionDeleter> c(xcb_connect(nullptr, nullptr));
    QVERIFY(!xcb_connection_has_error(c.data()));
    const QRect windowGeometry(0, 0, 100, 200);
    xcb_window_t w = xcb_generate_id(c.data());
    xcb_create_window(c.data(), XCB_COPY_FROM_PARENT, w, rootWindow(),
                      windowGeometry.x(),
                      windowGeometry.y(),
                      windowGeometry.width(),
                      windowGeometry.height(),
                      0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT, 0, nullptr);
    xcb_size_hints_t hints;
    memset(&hints, 0, sizeof(hints));
    xcb_icccm_size_hints_set_position(&hints, 1, windowGeometry.x(), windowGeometry.y());
    xcb_icccm_size_hints_set_size(&hints, 1, windowGeometry.width(), windowGeometry.height());
    xcb_icccm_set_wm_normal_hints(c.data(), w, &hints);
    xcb_map_window(c.data(), w);
    xcb_flush(c.data());

    // we should get a client for it
    QSignalSpy windowCreatedSpy(workspace(), &Workspace::clientAdded);
    QVERIFY(windowCreatedSpy.isValid());
    QVERIFY(windowCreatedSpy.wait());
    Client *client = windowCreatedSpy.first().first().value<Client*>();
    QVERIFY(client);
    QCOMPARE(client->window(), w);
    QVERIFY(client->isDecorated());

    QVERIFY(windowAddedSpy.wait());
    QVERIFY(!m_translucencyEffect->isActive());
    // let's send the window to desktop 2
    effects->setNumberOfDesktops(2);
    QCOMPARE(effects->numberOfDesktops(), 2);
    workspace()->sendClientToDesktop(client, 2, false);
    effects->setCurrentDesktop(2);
    QVERIFY(!m_translucencyEffect->isActive());
    KWin::Cursor::setPos(client->geometry().center());
    workspace()->performWindowOperation(client, Options::MoveOp);
    QVERIFY(m_translucencyEffect->isActive());
    QTest::qWait(200);
    QVERIFY(m_translucencyEffect->isActive());
    // now end move resize
    client->endMoveResize();
    QVERIFY(m_translucencyEffect->isActive());
    QTest::qWait(500);
    QVERIFY(!m_translucencyEffect->isActive());

    // and destroy the window again
    xcb_unmap_window(c.data(), w);
    xcb_flush(c.data());

    QSignalSpy windowClosedSpy(client, &Client::windowClosed);
    QVERIFY(windowClosedSpy.isValid());
    QVERIFY(windowClosedSpy.wait());
    xcb_destroy_window(c.data(), w);
    c.reset();
}

WAYLANDTEST_MAIN(TranslucencyTest)
#include "translucency_test.moc"