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

Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>

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 "main.h"

#include "kwin_interface.h"

#include <kaboutdata.h>
#include <kconfig.h>
#include <kconfiggroup.h>
#include <kdebug.h>
#include <kmessagebox.h>
#include <ksettings/dispatcher.h>
#include <kpluginselector.h>
#include <kservicetypetrader.h>
#include <kplugininfo.h>
#include <kservice.h>
#include <ktitlewidget.h>
#include <knotification.h>

#include <QtDBus/QtDBus>
#include <QTimer>
#include <QLabel>
#include <KPluginFactory>
#include <KPluginLoader>
#include <KIcon>

K_PLUGIN_FACTORY(KWinCompositingConfigFactory,
        registerPlugin<KWin::KWinCompositingConfig>();
        )
K_EXPORT_PLUGIN(KWinCompositingConfigFactory("kcmkwincompositing"))

namespace KWin
{


ConfirmDialog::ConfirmDialog() :
        KTimerDialog(10000, KTimerDialog::CountDown, 0,
                     i18n("Confirm Desktop Effects Change"), KTimerDialog::Ok|KTimerDialog::Cancel,
                     KTimerDialog::Cancel)
    {
    setObjectName( "mainKTimerDialog" );
    setButtonGuiItem( KDialog::Ok, KGuiItem( i18n( "&Accept Configuration" ), "dialog-ok" ));
    setButtonGuiItem( KDialog::Cancel, KGuiItem( i18n( "&Return to Previous Configuration" ), "dialog-cancel" ));

    QLabel *label = new QLabel( i18n( "Desktop effects settings have changed.\n"
            "Do you want to keep the new settings?\n"
            "They will be automatically reverted in 10 seconds." ), this );
    label->setWordWrap( true );
    setMainWidget( label );

    setWindowIcon(KIcon("preferences-desktop-effect"));
    }


KWinCompositingConfig::KWinCompositingConfig(QWidget *parent, const QVariantList &)
    : KCModule( KWinCompositingConfigFactory::componentData(), parent )
    , mKWinConfig(KSharedConfig::openConfig( "kwinrc" ))
    , m_showConfirmDialog( false )
    , kwinInterface( NULL )
    {
    KGlobal::locale()->insertCatalog( "kwin_effects" );
    ui.setupUi(this);
    layout()->setMargin(0);
    ui.verticalSpacer->changeSize(20, KDialog::groupSpacingHint());
    ui.verticalSpacer_2->changeSize(20, KDialog::groupSpacingHint());
    ui.tabWidget->setCurrentIndex(0);
    ui.statusTitleWidget->hide();

#define OPENGL_INDEX 0
#define XRENDER_INDEX 1
#ifndef KWIN_HAVE_OPENGL_COMPOSITING
    ui.compositingType->removeItem( OPENGL_INDEX );
    ui.glGroup->setEnabled( false );
#define OPENGL_INDEX -1
#define XRENDER_INDEX 0
#endif
#ifndef KWIN_HAVE_XRENDER_COMPOSITING
    ui.compositingType->removeItem( XRENDER_INDEX );
    ui.xrenderGroup->setEnabled( false );
#define XRENDER_INDEX -1
#endif

    kwinInterface = new OrgKdeKWinInterface( "org.kde.kwin", "/KWin", QDBusConnection::sessionBus() );

    connect(ui.useCompositing, SIGNAL(toggled(bool)), this, SLOT(compositingEnabled(bool)));
    connect(ui.tabWidget, SIGNAL(currentChanged(int)), this, SLOT(currentTabChanged(int)));

    connect(ui.useCompositing, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.effectWinManagement, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.effectShadows, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.effectAnimations, SIGNAL(toggled(bool)), this, SLOT(changed()));

    connect(ui.effectSelector, SIGNAL(changed(bool)), this, SLOT(changed()));
    connect(ui.effectSelector, SIGNAL(configCommitted(const QByteArray&)),
            this, SLOT(reparseConfiguration(const QByteArray&)));

    connect(ui.windowSwitchingCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));
    connect(ui.desktopSwitchingCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));
    connect(ui.animationSpeedCombo, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));

    connect(ui.compositingType, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));
    connect(ui.windowThumbnails, SIGNAL(activated(int)), this, SLOT(changed()));
    connect(ui.disableChecks, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.glMode, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));
    connect(ui.glTextureFilter, SIGNAL(currentIndexChanged(int)), this, SLOT(changed()));
    connect(ui.glDirect, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.glVSync, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.xrenderSmoothScale, SIGNAL(toggled(bool)), this, SLOT(changed()));
    connect(ui.compositingStateButton, SIGNAL(clicked(bool)), kwinInterface, SLOT(toggleCompositing()));
    connect(kwinInterface, SIGNAL(compositingToggled(bool)), this, SLOT(setupCompositingState(bool)));

    // Open the temporary config file
    // Temporary conf file is used to synchronize effect checkboxes with effect
    // selector by loading/saving effects from/to temp config when active tab
    // changes.
    mTmpConfigFile.open();
    mTmpConfig = KSharedConfig::openConfig(mTmpConfigFile.fileName());

    if( CompositingPrefs::compositingPossible() )
        {
        // Driver-specific config detection
        mDefaultPrefs.detect();
        initEffectSelector();

        // Initialize the user interface with the config loaded from kwinrc.
        load();
        }
    else
        {
        ui.useCompositing->setEnabled(false);
        ui.useCompositing->setChecked(false);
        compositingEnabled(false);

        QString text = i18n("Compositing is not supported on your system.");
        text += "<br>";
        text += CompositingPrefs::compositingNotPossibleReason();
        ui.statusTitleWidget->setText(text);
        ui.statusTitleWidget->setPixmap(KTitleWidget::InfoMessage, KTitleWidget::ImageLeft);
        ui.statusTitleWidget->show();

        setupCompositingState( false, false );
        }

    KAboutData *about = new KAboutData(I18N_NOOP("kcmkwincompositing"), 0,
            ki18n("KWin Desktop Effects Configuration Module"),
            0, KLocalizedString(), KAboutData::License_GPL, ki18n("(c) 2007 Rivo Laks"));
    about->addAuthor(ki18n("Rivo Laks"), KLocalizedString(), "rivolaks@hot.ee");
    setAboutData(about);

    // search the effect names
    KServiceTypeTrader* trader = KServiceTypeTrader::self();
    KService::List services;
    QString boxswitch, presentwindows, coverswitch, flipswitch, slide, cube, fadedesktop;
    // window switcher
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_boxswitch'");
    if( !services.isEmpty() )
        boxswitch = services.first()->name();
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_presentwindows'");
    if( !services.isEmpty() )
        presentwindows = services.first()->name();
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_coverswitch'");
    if( !services.isEmpty() )
        coverswitch = services.first()->name();
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_flipswitch'");
    if( !services.isEmpty() )
        flipswitch = services.first()->name();
    // desktop switcher
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_slide'");
    if( !services.isEmpty() )
        slide = services.first()->name();
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_cubeslide'");
    if( !services.isEmpty() )
        cube = services.first()->name();
    services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_fadedesktop'");
    if( !services.isEmpty() )
        fadedesktop = services.first()->name();
    // init the combo boxes
    ui.windowSwitchingCombo->addItem(i18n("No Effect"));
    ui.windowSwitchingCombo->addItem(boxswitch);
    ui.windowSwitchingCombo->addItem(presentwindows);
    ui.windowSwitchingCombo->addItem(coverswitch);
    ui.windowSwitchingCombo->addItem(flipswitch);

    ui.desktopSwitchingCombo->addItem(i18n("No Effect"));
    ui.desktopSwitchingCombo->addItem(slide);
    ui.desktopSwitchingCombo->addItem(cube);
    ui.desktopSwitchingCombo->addItem(fadedesktop);
    }

KWinCompositingConfig::~KWinCompositingConfig()
    {
    }

void KWinCompositingConfig::reparseConfiguration( const QByteArray& conf )
    {
    KSettings::Dispatcher::reparseConfiguration( conf );
    }

void KWinCompositingConfig::compositingEnabled( bool enabled )
    {
    // Enable the other configuration tabs only when compositing is enabled.
    ui.compositingOptionsContainer->setEnabled(enabled);
    ui.tabWidget->setTabEnabled(1, enabled);
    ui.tabWidget->setTabEnabled(2, enabled);
    }

void KWinCompositingConfig::showConfirmDialog( bool reinitCompositing )
    {
    bool revert = false;
    // Feel free to extend this to support several kwin instances (multihead) if you
    // think it makes sense.
    OrgKdeKWinInterface kwin("org.kde.kwin", "/KWin", QDBusConnection::sessionBus());
    if( reinitCompositing ? !kwin.compositingActive().value() : !kwin.waitForCompositingSetup().value() )
        {
        KMessageBox::sorry( this, i18n(
            "Failed to activate desktop effects using the given "
            "configuration options. Settings will be reverted to their previous values.\n\n"
            "Check your X configuration. You may also consider changing advanced options, "
            "especially changing the compositing type." ));
        revert = true;
        }
    else
        {
        ConfirmDialog confirm;
        if( !confirm.exec())
            revert = true;
        else
            {
            // compositing is enabled now
            setupCompositingState( kwinInterface->compositingActive() );
            checkLoadedEffects();
            }
        }
    if( revert )
        {
        // Revert settings
        KConfigGroup config(mKWinConfig, "Compositing");
        config.deleteGroup();
        QMap<QString, QString>::const_iterator it = mPreviousConfig.constBegin();
        for(; it != mPreviousConfig.constEnd(); ++it)
            {
            if (it.value().isEmpty())
                continue;
            config.writeEntry(it.key(), it.value());
            }
        // Sync with KWin and reload
        configChanged(reinitCompositing);
        load();
        }
    }

void KWinCompositingConfig::initEffectSelector()
    {
    // Find all .desktop files of the effects
    KService::List offers = KServiceTypeTrader::self()->query("KWin/Effect");
    QList<KPluginInfo> effectinfos = KPluginInfo::fromServices(offers);

    // Add them to the plugin selector
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Appearance"), "Appearance", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Accessibility"), "Accessibility", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Focus"), "Focus", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Window Management"), "Window Management", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Candy"), "Candy", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Demos"), "Demos", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Tests"), "Tests", mTmpConfig);
    ui.effectSelector->addPlugins(effectinfos, KPluginSelector::ReadConfigFile, i18n("Tools"), "Tools", mTmpConfig);
    }

void KWinCompositingConfig::currentTabChanged(int tab)
    {
    // block signals to don't emit the changed()-signal by just switching the current tab
    blockSignals(true);

    // write possible changes done to synchronize effect checkboxes and selector
    // TODO: This segment is prone to fail when the UI is changed;
    // you'll most likely not think of the hard coded numbers here when just changing the order of the tabs.
    if (tab == 0)
        {
        // General tab was activated
        saveEffectsTab();
        loadGeneralTab();
        }
    else if ( tab == 1 )
        {
        // Effects tab was activated
        saveGeneralTab();
        loadEffectsTab();
        }

    blockSignals(false);
    }

void KWinCompositingConfig::loadGeneralTab()
    {
    KConfigGroup config(mKWinConfig, "Compositing");
    bool enabled = config.readEntry("Enabled", mDefaultPrefs.enableCompositing());
    ui.useCompositing->setChecked( enabled );
    ui.animationSpeedCombo->setCurrentIndex(config.readEntry("AnimationSpeed", 3 ));

    // Load effect settings
    KConfigGroup effectconfig(mTmpConfig, "Plugins");
#define LOAD_EFFECT_CONFIG(effectname)  effectconfig.readEntry("kwin4_effect_" effectname "Enabled", true)
    int winManagementEnabled = LOAD_EFFECT_CONFIG("presentwindows")
        + LOAD_EFFECT_CONFIG("desktopgrid")
        + LOAD_EFFECT_CONFIG("dialogparent");
    if (winManagementEnabled > 0 && winManagementEnabled < 3)
        {
        ui.effectWinManagement->setTristate(true);
        ui.effectWinManagement->setCheckState(Qt::PartiallyChecked);
        }
    else
        ui.effectWinManagement->setChecked(winManagementEnabled);
    ui.effectShadows->setChecked(LOAD_EFFECT_CONFIG("shadow"));
    ui.effectAnimations->setChecked(LOAD_EFFECT_CONFIG("minimizeanimation"));
#undef LOAD_EFFECT_CONFIG

    // window switching
    // Set current option to "none" if no plugin is activated.
    ui.windowSwitchingCombo->setCurrentIndex( 0 );
    KConfigGroup boxswitchconfig(mKWinConfig, "Effect-BoxSwitch");
    if( effectEnabled( "boxswitch", effectconfig ) && boxswitchconfig.readEntry("TabBox", true))
        ui.windowSwitchingCombo->setCurrentIndex( 1 );
    KConfigGroup coverswitchconfig(mKWinConfig, "Effect-CoverSwitch");
    if( effectEnabled( "coverswitch", effectconfig ) && coverswitchconfig.readEntry("TabBox", false))
        ui.windowSwitchingCombo->setCurrentIndex( 3 );
    KConfigGroup flipswitchconfig(mKWinConfig, "Effect-FlipSwitch");
    if( effectEnabled( "flipswitch", effectconfig ) && flipswitchconfig.readEntry("TabBox", false))
        ui.windowSwitchingCombo->setCurrentIndex( 4 );
    KConfigGroup presentwindowsconfig(mKWinConfig, "Effect-PresentWindows");
    if( effectEnabled( "presentwindows", effectconfig ) && presentwindowsconfig.readEntry("TabBox", false) )
        ui.windowSwitchingCombo->setCurrentIndex( 2 );

    // desktop switching
    // Set current option to "none" if no plugin is activated.
    ui.desktopSwitchingCombo->setCurrentIndex( 0 );
    if( effectEnabled( "slide", effectconfig ))
        ui.desktopSwitchingCombo->setCurrentIndex( 1 );
    if( effectEnabled( "cubeslide", effectconfig ))
        ui.desktopSwitchingCombo->setCurrentIndex( 2 );
    if( effectEnabled( "fadedesktop", effectconfig ))
        ui.desktopSwitchingCombo->setCurrentIndex( 3 );

    if( enabled )
        setupCompositingState( kwinInterface->compositingActive() );
    else
        setupCompositingState( false, false );
    }

void KWinCompositingConfig::setupCompositingState( bool active, bool enabled )
    {
    if( getenv( "KDE_FAILSAFE" ))
        enabled = false;
    // compositing state
    QString stateIcon;
    QString stateText;
    QString stateButtonText;
    if( enabled )
        {
        // check if compositing is active or suspended
        if( active )
            {
            stateIcon = QString( "dialog-ok-apply" );
            stateText = i18n( "Compositing is active" );
            stateButtonText = i18n( "Suspend Compositing" );
            }
        else
            {
            stateIcon = QString( "dialog-cancel" );
            stateText = i18n( "Compositing is temporarily disabled" );
            stateButtonText = i18n( "Resume Compositing" );
            }
        }
    else
        {
        // compositing is disabled
        stateIcon = QString( "dialog-cancel" );
        stateText = i18n( "Compositing is disabled" );
        stateButtonText = i18n( "Resume Compositing" );
        }
    const int iconSize = (QApplication::fontMetrics().height() > 24) ? 32 : 22;
    ui.compositingStateIcon->setPixmap( KIcon( stateIcon ).pixmap( iconSize, iconSize ) );
    ui.compositingStateLabel->setText( stateText );
    ui.compositingStateButton->setText( stateButtonText );
    ui.compositingStateIcon->setEnabled( enabled );
    ui.compositingStateLabel->setEnabled( enabled );
    ui.compositingStateButton->setEnabled( enabled );
    }

bool KWinCompositingConfig::effectEnabled( const QString& effect, const KConfigGroup& cfg ) const
    {
    KService::List services = KServiceTypeTrader::self()->query(
        "KWin/Effect", "[X-KDE-PluginInfo-Name] == 'kwin4_effect_" + effect + "'");
    if( services.isEmpty())
        return false;
    QVariant v = services.first()->property("X-KDE-PluginInfo-EnabledByDefault");
    return cfg.readEntry("kwin4_effect_" + effect + "Enabled", v.toBool());
    }

void KWinCompositingConfig::loadEffectsTab()
    {
    ui.effectSelector->load();
    }

void KWinCompositingConfig::loadAdvancedTab()
    {
    KConfigGroup config(mKWinConfig, "Compositing");
    QString backend = config.readEntry("Backend", "OpenGL");
    ui.compositingType->setCurrentIndex((backend == "XRender") ? XRENDER_INDEX : 0);
    // 4 - off, 5 - shown, 6 - always, other are old values
    int hps = config.readEntry("HiddenPreviews", 5);
    if( hps == 6 ) // always
        ui.windowThumbnails->setCurrentIndex( 0 );
    else if( hps == 4 ) // never
        ui.windowThumbnails->setCurrentIndex( 2 );
    else // shown, or default
        ui.windowThumbnails->setCurrentIndex( 1 );
    ui.disableChecks->setChecked( config.readEntry( "DisableChecks", false ));

    QString glMode = config.readEntry("GLMode", "TFP");
    ui.glMode->setCurrentIndex((glMode == "TFP") ? 0 : ((glMode == "SHM") ? 1 : 2));
    ui.glTextureFilter->setCurrentIndex(config.readEntry("GLTextureFilter", 1));
    ui.glDirect->setChecked(config.readEntry("GLDirect", mDefaultPrefs.enableDirectRendering()));
    ui.glVSync->setChecked(config.readEntry("GLVSync", mDefaultPrefs.enableVSync()));

    ui.xrenderSmoothScale->setChecked(config.readEntry("XRenderSmoothScale", false));
    }

void KWinCompositingConfig::load()
    {
    mKWinConfig->reparseConfiguration();

    // Copy Plugins group to temp config file
    QMap<QString, QString> entries = mKWinConfig->entryMap("Plugins");
    QMap<QString, QString>::const_iterator it = entries.constBegin();
    KConfigGroup tmpconfig(mTmpConfig, "Plugins");
    tmpconfig.deleteGroup();
    for(; it != entries.constEnd(); ++it)
        tmpconfig.writeEntry(it.key(), it.value());

    loadGeneralTab();
    loadEffectsTab();
    loadAdvancedTab();

    emit changed( false );
    }

void KWinCompositingConfig::saveGeneralTab()
    {
    KConfigGroup config(mKWinConfig, "Compositing");
    // Check if any critical settings that need confirmation have changed
    if(ui.useCompositing->isChecked() &&
       ui.useCompositing->isChecked() != config.readEntry("Enabled", mDefaultPrefs.enableCompositing()))
        m_showConfirmDialog = true;

    config.writeEntry("Enabled", ui.useCompositing->isChecked());
    config.writeEntry("AnimationSpeed", ui.animationSpeedCombo->currentIndex());

    // disable the compositing state if compositing was turned off
    if( !ui.useCompositing->isChecked() )
        setupCompositingState( false, false );

    // Save effects
    KConfigGroup effectconfig(mTmpConfig, "Plugins");
#define WRITE_EFFECT_CONFIG(effectname, widget)  effectconfig.writeEntry("kwin4_effect_" effectname "Enabled", widget->isChecked())
    if (ui.effectWinManagement->checkState() != Qt::PartiallyChecked)
        {
        WRITE_EFFECT_CONFIG("presentwindows", ui.effectWinManagement);
        WRITE_EFFECT_CONFIG("desktopgrid", ui.effectWinManagement);
        WRITE_EFFECT_CONFIG("dialogparent", ui.effectWinManagement);
        }
    WRITE_EFFECT_CONFIG("shadow", ui.effectShadows);
    // TODO: maybe also do some effect-specific configuration here, e.g.
    //  enable/disable desktopgrid's animation according to this setting
    WRITE_EFFECT_CONFIG("minimizeanimation", ui.effectAnimations);
#undef WRITE_EFFECT_CONFIG

    int windowSwitcher = ui.windowSwitchingCombo->currentIndex();
    bool boxSwitch              = false;
    bool presentWindowSwitching = false;
    bool coverSwitch            = false;
    bool flipSwitch             = false;
    switch( windowSwitcher )
        {
        case 1:
            boxSwitch = true;
            break;
        case 2:
            presentWindowSwitching = true;
            break;
        case 3:
            coverSwitch = true;
            break;
        case 4:
            flipSwitch = true;
            break;
        default:
            break; // nothing
        }
    // activate effects if not active
    if( boxSwitch )
        effectconfig.writeEntry("kwin4_effect_boxswitchEnabled", true);
    if( presentWindowSwitching )
        effectconfig.writeEntry("kwin4_effect_presentwindowsEnabled", true);
    if( coverSwitch )
        effectconfig.writeEntry("kwin4_effect_coverswitchEnabled", true);
    if( flipSwitch )
        effectconfig.writeEntry("kwin4_effect_flipswitchEnabled", true);
    KConfigGroup boxswitchconfig( mKWinConfig, "Effect-BoxSwitch" );
    boxswitchconfig.writeEntry( "TabBox", boxSwitch );
    boxswitchconfig.sync();
    KConfigGroup presentwindowsconfig( mKWinConfig, "Effect-PresentWindows" );
    presentwindowsconfig.writeEntry( "TabBox", presentWindowSwitching );
    presentwindowsconfig.sync();
    KConfigGroup coverswitchconfig( mKWinConfig, "Effect-CoverSwitch" );
    coverswitchconfig.writeEntry( "TabBox", coverSwitch );
    coverswitchconfig.sync();
    KConfigGroup flipswitchconfig( mKWinConfig, "Effect-FlipSwitch" );
    flipswitchconfig.writeEntry( "TabBox", flipSwitch );
    flipswitchconfig.sync();

    int desktopSwitcher = ui.desktopSwitchingCombo->currentIndex();
    switch( desktopSwitcher )
        {
        case 0:
            // no effect
            effectconfig.writeEntry("kwin4_effect_slideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_cubeslideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_fadedesktopEnabled", false);
            break;
        case 1:
            // slide
            effectconfig.writeEntry("kwin4_effect_slideEnabled", true);
            effectconfig.writeEntry("kwin4_effect_cubeslideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_fadedesktopEnabled", false);
            break;
        case 2:
            // cube
            effectconfig.writeEntry("kwin4_effect_slideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_cubeslideEnabled", true);
            effectconfig.writeEntry("kwin4_effect_fadedesktopEnabled", false);
            break;
        case 3:
            // fadedesktop
            effectconfig.writeEntry("kwin4_effect_slideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_cubeslideEnabled", false);
            effectconfig.writeEntry("kwin4_effect_fadedesktopEnabled", true);
            break;
        }
    }

void KWinCompositingConfig::saveEffectsTab()
    {
    ui.effectSelector->save();
    }

bool KWinCompositingConfig::saveAdvancedTab()
    {
    bool advancedChanged = false;
    static const int hps[] = { 6 /*always*/, 5 /*shown*/,  4 /*never*/ };

    KConfigGroup config(mKWinConfig, "Compositing");
    QString glModes[] = { "TFP", "SHM", "Fallback" };

    if( config.readEntry("Backend", "OpenGL")
            != ((ui.compositingType->currentIndex() == 0) ? "OpenGL" : "XRender")
        || config.readEntry("GLMode", "TFP") != glModes[ui.glMode->currentIndex()]
        || config.readEntry("GLDirect", mDefaultPrefs.enableDirectRendering())
            != ui.glDirect->isChecked()
        || config.readEntry("GLVSync", mDefaultPrefs.enableVSync()) != ui.glVSync->isChecked()
        || config.readEntry("DisableChecks", false ) != ui.disableChecks->isChecked())
        {
        m_showConfirmDialog = true;
        advancedChanged = true;
        }
    else if( config.readEntry("HiddenPreviews", 5) != hps[ ui.windowThumbnails->currentIndex() ]
        || config.readEntry("XRenderSmoothScale", false ) != ui.xrenderSmoothScale->isChecked() )
        advancedChanged = true;

    config.writeEntry("Backend", (ui.compositingType->currentIndex() == OPENGL_INDEX) ? "OpenGL" : "XRender");
    config.writeEntry("HiddenPreviews", hps[ ui.windowThumbnails->currentIndex() ] );
    config.writeEntry("DisableChecks", ui.disableChecks->isChecked());

    config.writeEntry("GLMode", glModes[ui.glMode->currentIndex()]);
    config.writeEntry("GLTextureFilter", ui.glTextureFilter->currentIndex());
    config.writeEntry("GLDirect", ui.glDirect->isChecked());
    config.writeEntry("GLVSync", ui.glVSync->isChecked());

    config.writeEntry("XRenderSmoothScale", ui.xrenderSmoothScale->isChecked());

    return advancedChanged;
    }

void KWinCompositingConfig::save()
    {
    // Save current config. We'll use this for restoring in case something goes wrong.
    KConfigGroup config(mKWinConfig, "Compositing");
    mPreviousConfig = config.entryMap();

    // bah; tab content being dependent on the other is really bad; and
    // deprecated in the HIG for a reason.  It is confusing!
    // Make sure we only call save on each tab once; as they are stateful due to the revert concept
    if ( ui.tabWidget->currentIndex() == 0 ) // "General" tab was active
        {
        saveGeneralTab();
        loadEffectsTab();
        saveEffectsTab();
        }
    else
        {
        saveEffectsTab();
        loadGeneralTab();
        saveGeneralTab();
        }
    bool advancedChanged = saveAdvancedTab();

    // Copy Plugins group from temp config to real config
    QMap<QString, QString> entries = mTmpConfig->entryMap("Plugins");
    QMap<QString, QString>::const_iterator it = entries.constBegin();
    KConfigGroup realconfig(mKWinConfig, "Plugins");
    realconfig.deleteGroup();
    for(; it != entries.constEnd(); ++it)
        realconfig.writeEntry(it.key(), it.value());

    emit changed( false );

    configChanged(advancedChanged);

    // This assumes that this KCM is running with the same environment variables as KWin
    // TODO: Detect KWIN_COMPOSE=N as well
    if( getenv( "KDE_FAILSAFE" ) && ui.useCompositing->isChecked() )
        {
        KMessageBox::sorry( this, i18n(
            "Your settings have been saved but as KDE is currently running in failsafe"
            "mode desktop effects cannot be enabled at this time.\n\n"
            "Please exit failsafe mode to enable desktop effects." ));
        m_showConfirmDialog = false; // Dangerous but there is no way to test if failsafe mode
        }

    if(m_showConfirmDialog)
        {
        m_showConfirmDialog = false;
        showConfirmDialog(advancedChanged);
        }
    }

void KWinCompositingConfig::checkLoadedEffects()
    {
    // check for effects not supported by Backend or hardware
    // such effects are enabled but not returned by DBus method loadedEffects
    QDBusMessage message = QDBusMessage::createMethodCall( "org.kde.kwin", "/KWin", "org.kde.KWin", "loadedEffects" );
    QDBusMessage reply = QDBusConnection::sessionBus().call( message );
    KConfigGroup effectConfig = KConfigGroup( mKWinConfig, "Compositing" );
    bool enabledAfter = effectConfig.readEntry( "Enabled", mDefaultPrefs.enableCompositing() );

    if( reply.type() == QDBusMessage::ReplyMessage && enabledAfter && !getenv( "KDE_FAILSAFE" ))
        {
        effectConfig = KConfigGroup( mKWinConfig, "Plugins" );
        QStringList loadedEffects = reply.arguments()[0].toStringList();
        QStringList effects = effectConfig.keyList();
        QStringList disabledEffects = QStringList();
        foreach( QString effect, effects )
            {
            QString temp = effect.mid( 13, effect.length() - 13 - 7 );
            effect.truncate( effect.length() - 7 );
            if( effectEnabled( temp, effectConfig ) && !loadedEffects.contains( effect ) )
                {
                disabledEffects << effect;
                }
            }
        if( !disabledEffects.isEmpty() )
            {
            KServiceTypeTrader* trader = KServiceTypeTrader::self();
            KService::List services;
            QString message = i18n( "The following effects could not be activated:" );
            message.append( "<ul>" );
            foreach( const QString &effect, disabledEffects )
                {
                services = trader->query("KWin/Effect", "[X-KDE-PluginInfo-Name] == '" + effect + "'");
                message.append( "<li>" );
                if( !services.isEmpty() )
                    message.append( services.first()->name() );
                else
                    message.append( effect);
                message.append( "</li>" );
                }
            message.append( "</ul>" );
            KNotification::event( "effectsnotsupported", message, QPixmap(), NULL, KNotification::CloseOnTimeout, KComponentData( "kwin" ) );
            }
        }
    }

void KWinCompositingConfig::configChanged(bool reinitCompositing)
    {
    // Send signal to kwin
    mKWinConfig->sync();
    // Send signal to all kwin instances
    QDBusMessage message = QDBusMessage::createSignal("/KWin", "org.kde.KWin",
        reinitCompositing ? "reinitCompositing" : "reloadConfig");
    QDBusConnection::sessionBus().send(message);

    // HACK: We can't just do this here, due to the asynchronous nature of signals.
    // We also can't change reinitCompositing into a message (which would allow
    // callWithCallbac() to do this neater) due to multiple kwin instances.
    if( !m_showConfirmDialog )
        QTimer::singleShot(1000, this, SLOT(checkLoadedEffects()));
    }


void KWinCompositingConfig::defaults()
    {
    ui.tabWidget->setCurrentIndex(0);

    ui.useCompositing->setChecked(mDefaultPrefs.enableCompositing());
    ui.effectWinManagement->setChecked(true);
    ui.effectShadows->setChecked(true);
    ui.effectAnimations->setChecked(true);

    ui.windowSwitchingCombo->setCurrentIndex( 1 );
    ui.desktopSwitchingCombo->setCurrentIndex( 1 );
    ui.animationSpeedCombo->setCurrentIndex( 3 );

    ui.effectSelector->defaults();

    ui.compositingType->setCurrentIndex( 0 );
    ui.windowThumbnails->setCurrentIndex( 1 );
    ui.disableChecks->setChecked( false );
    ui.glMode->setCurrentIndex( 0 );
    ui.glTextureFilter->setCurrentIndex( 1 );
    ui.glDirect->setChecked( mDefaultPrefs.enableDirectRendering() );
    ui.glVSync->setChecked( mDefaultPrefs.enableVSync() );
    ui.xrenderSmoothScale->setChecked( false );
    }

QString KWinCompositingConfig::quickHelp() const
    {
    return i18n("<h1>Desktop Effects</h1>");
    }

} // namespace

#include "main.moc"