/********************************************************************
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_client.h"
#include "platform.h"
#include "x11client.h"
#include "cursor.h"
#include "deleted.h"
#include "screenedge.h"
#include "screens.h"
#include "wayland_server.h"
#include "workspace.h"
#include "xcbutils.h"
#include <kwineffects.h>

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

namespace KWin
{

static const QString s_socketName = QStringLiteral("wayland_test_kwin_x11_desktop_window-0");

class X11DesktopWindowTest : public QObject
{
    Q_OBJECT
private Q_SLOTS:
    void initTestCase();
    void init();
    void cleanup();
    void testDesktopWindow();

private:
};

void X11DesktopWindowTest::initTestCase()
{
    qRegisterMetaType<KWin::AbstractClient*>();
    qRegisterMetaType<KWin::Deleted*>();
    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));

    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 X11DesktopWindowTest::init()
{
    screens()->setCurrent(0);
    Cursors::self()->mouse()->setPos(QPoint(640, 512));
}

void X11DesktopWindowTest::cleanup()
{
}

struct XcbConnectionDeleter
{
    static inline void cleanup(xcb_connection_t *pointer)
    {
        xcb_disconnect(pointer);
    }
};

void X11DesktopWindowTest::testDesktopWindow()
{
    // this test creates a desktop window with an RGBA visual and verifies that it's only considered
    // as an RGB (opaque) window in KWin

    // create an xcb window
    QScopedPointer<xcb_connection_t, XcbConnectionDeleter> c(xcb_connect(nullptr, nullptr));
    QVERIFY(!xcb_connection_has_error(c.data()));

    xcb_window_t w = xcb_generate_id(c.data());
    const QRect windowGeometry(0, 0, 1280, 1024);

    // helper to find the visual
    auto findDepth = [&c] () -> xcb_visualid_t {
        // find a visual with 32 depth
        const xcb_setup_t *setup = xcb_get_setup(c.data());

        for (auto screen = xcb_setup_roots_iterator(setup); screen.rem; xcb_screen_next(&screen)) {
            for (auto depth = xcb_screen_allowed_depths_iterator(screen.data); depth.rem; xcb_depth_next(&depth)) {
                if (depth.data->depth != 32) {
                    continue;
                }
                const int len = xcb_depth_visuals_length(depth.data);
                const xcb_visualtype_t *visuals = xcb_depth_visuals(depth.data);

                for (int i = 0; i < len; i++) {
                    return visuals[0].visual_id;
                }
            }
        }
        return 0;
    };
    auto visualId = findDepth();
    auto colormapId = xcb_generate_id(c.data());
    auto cmCookie = xcb_create_colormap_checked(c.data(), XCB_COLORMAP_ALLOC_NONE, colormapId, rootWindow(), visualId);
    QVERIFY(!xcb_request_check(c.data(), cmCookie));

    const uint32_t values[] = {XCB_PIXMAP_NONE, defaultScreen()->black_pixel, colormapId};
    auto cookie = xcb_create_window_checked(c.data(), 32, w, rootWindow(),
                      windowGeometry.x(),
                      windowGeometry.y(),
                      windowGeometry.width(),
                      windowGeometry.height(),
                      0, XCB_WINDOW_CLASS_INPUT_OUTPUT, visualId, XCB_CW_BACK_PIXMAP | XCB_CW_BORDER_PIXEL | XCB_CW_COLORMAP, values);
    QVERIFY(!xcb_request_check(c.data(), cookie));
    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);
    NETWinInfo info(c.data(), w, rootWindow(), NET::WMAllProperties, NET::WM2AllProperties);
    info.setWindowType(NET::Desktop);
    xcb_map_window(c.data(), w);
    xcb_flush(c.data());

    // verify through a geometry request that it's depth 32
    Xcb::WindowGeometry geo(w);
    QCOMPARE(geo->depth, uint8_t(32));

    // we should get a client for it
    QSignalSpy windowCreatedSpy(workspace(), &Workspace::clientAdded);
    QVERIFY(windowCreatedSpy.isValid());
    QVERIFY(windowCreatedSpy.wait());
    X11Client *client = windowCreatedSpy.first().first().value<X11Client *>();
    QVERIFY(client);
    QCOMPARE(client->window(), w);
    QVERIFY(!client->isDecorated());
    QCOMPARE(client->windowType(), NET::Desktop);
    QCOMPARE(client->frameGeometry(), windowGeometry);
    QVERIFY(client->isDesktop());
    QCOMPARE(client->depth(), 24);
    QVERIFY(!client->hasAlpha());

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

    QSignalSpy windowClosedSpy(client, &X11Client::windowClosed);
    QVERIFY(windowClosedSpy.isValid());
    QVERIFY(windowClosedSpy.wait());
}

}

WAYLANDTEST_MAIN(KWin::X11DesktopWindowTest)
#include "desktop_window_x11_test.moc"