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

Copyright (C) 2015 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 "../../platform.h"
#include "../../composite.h"
#include "../../effects.h"
#include "../../wayland_server.h"
#include "../../workspace.h"
#include "../../xcbutils.h"
#include "../../xwl/xwayland.h"

#include <KPluginMetaData>

#include <QAbstractEventDispatcher>
#include <QPluginLoader>
#include <QSocketNotifier>
#include <QStyle>
#include <QThread>
#include <QtConcurrentRun>

// system
#include <unistd.h>
#include <sys/socket.h>
#include <iostream>

namespace KWin
{

WaylandTestApplication::WaylandTestApplication(OperationMode mode, int &argc, char **argv)
    : ApplicationWaylandAbstract(mode, argc, argv)
{
    QStandardPaths::setTestModeEnabled(true);
    // TODO: add a test move to kglobalaccel instead?
    QFile{QStandardPaths::locate(QStandardPaths::ConfigLocation, QStringLiteral("kglobalshortcutsrc"))}.remove();
    QIcon::setThemeName(QStringLiteral("breeze"));
#ifdef KWIN_BUILD_ACTIVITIES
    setUseKActivities(false);
#endif
    qputenv("KWIN_COMPOSE", QByteArrayLiteral("Q"));
    qunsetenv("XKB_DEFAULT_RULES");
    qunsetenv("XKB_DEFAULT_MODEL");
    qunsetenv("XKB_DEFAULT_LAYOUT");
    qunsetenv("XKB_DEFAULT_VARIANT");
    qunsetenv("XKB_DEFAULT_OPTIONS");

    const auto ownPath = libraryPaths().last();
    removeLibraryPath(ownPath);
    addLibraryPath(ownPath);

    const auto plugins = KPluginLoader::findPluginsById(QStringLiteral("org.kde.kwin.waylandbackends"), "KWinWaylandVirtualBackend");
    if (plugins.empty()) {
        quit();
        return;
    }
    initPlatform(plugins.first());
    WaylandServer::create(this);
    setProcessStartupEnvironment(QProcessEnvironment::systemEnvironment());
}

WaylandTestApplication::~WaylandTestApplication()
{
    setTerminating();
    kwinApp()->platform()->setOutputsEnabled(false);
    // need to unload all effects prior to destroying X connection as they might do X calls
    // also before destroy Workspace, as effects might call into Workspace
    if (effects) {
        static_cast<EffectsHandlerImpl*>(effects)->unloadAllEffects();
    }
    destroyWorkspace();
    waylandServer()->dispatch();
    if (QStyle *s = style()) {
        s->unpolish(this);
    }
    // kill Xwayland before terminating its connection
    delete m_xwayland;
    waylandServer()->terminateClientConnections();
    destroyCompositor();
}

void WaylandTestApplication::performStartup()
{
    // first load options - done internally by a different thread
    createOptions();
    waylandServer()->createInternalConnection();

    // try creating the Wayland Backend
    createInput();
    createBackend();
}

void WaylandTestApplication::createBackend()
{
    Platform *platform = kwinApp()->platform();
    connect(platform, &Platform::screensQueried, this, &WaylandTestApplication::continueStartupWithScreens);
    connect(platform, &Platform::initFailed, this,
        [] () {
            std::cerr <<  "FATAL ERROR: backend failed to initialize, exiting now" << std::endl;
            ::exit(1);
        }
    );
    platform->init();
}

void WaylandTestApplication::continueStartupWithScreens()
{
    disconnect(kwinApp()->platform(), &Platform::screensQueried, this, &WaylandTestApplication::continueStartupWithScreens);
    createScreens();

    if (operationMode() == OperationModeWaylandOnly) {
        createCompositor();
        connect(Compositor::self(), &Compositor::sceneCreated, this, &WaylandTestApplication::continueStartupWithSceen);
        return;
    }
    createCompositor();
    connect(Compositor::self(), &Compositor::sceneCreated, this, &WaylandTestApplication::continueStartupWithXwayland);
}

void WaylandTestApplication::continueStartupWithSceen()
{
    disconnect(Compositor::self(), &Compositor::sceneCreated, this, &WaylandTestApplication::continueStartupWithSceen);
    createWorkspace();
}

void WaylandTestApplication::continueStartupWithXwayland()
{
    disconnect(Compositor::self(), &Compositor::sceneCreated, this, &WaylandTestApplication::continueStartupWithXwayland);

    m_xwayland = new Xwl::Xwayland(this);
    connect(m_xwayland, &Xwl::Xwayland::criticalError, this, [](int code) {
        // we currently exit on Xwayland errors always directly
        // TODO: restart Xwayland
        std::cerr << "Xwayland had a critical error. Going to exit now." << std::endl;
        exit(code);
    });
    m_xwayland->init();
}

}