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

Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
Copyright (C) 2010, 2011 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/>.
*********************************************************************/

#ifndef KWIN_EFFECTSIMPL_H
#define KWIN_EFFECTSIMPL_H

#include "kwineffects.h"

#include "scene.h"
#include "xcbutils.h"

#include <QStack>
#include <QHash>
#include <QQueue>
#include <Plasma/FrameSvg>

namespace Plasma {
class Theme;
}

class QDBusPendingCallWatcher;
class QDBusServiceWatcher;
class KService;
class OrgFreedesktopScreenSaverInterface;


namespace KWin
{

class AbstractThumbnailItem;
class DesktopThumbnailItem;
class WindowThumbnailItem;

class Client;
class Compositor;
class Deleted;
class EffectLoader;
class Unmanaged;
class ScreenLockerWatcher;

class EffectsHandlerImpl : public EffectsHandler
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "org.kde.kwin.Effects")
    Q_PROPERTY(QStringList activeEffects READ activeEffects)
    Q_PROPERTY(QStringList loadedEffects READ loadedEffects)
    Q_PROPERTY(QStringList listOfEffects READ listOfEffects)
public:
    EffectsHandlerImpl(Compositor *compositor, Scene *scene);
    virtual ~EffectsHandlerImpl();
    void prePaintScreen(ScreenPrePaintData& data, int time) override;
    void paintScreen(int mask, QRegion region, ScreenPaintData& data) override;
    /**
     * Special hook to perform a paintScreen but just with the windows on @p desktop.
     **/
    void paintDesktop(int desktop, int mask, QRegion region, ScreenPaintData& data);
    void postPaintScreen() override;
    void prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time) override;
    void paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data) override;
    void postPaintWindow(EffectWindow* w) override;
    void paintEffectFrame(EffectFrame* frame, QRegion region, double opacity, double frameOpacity) override;

    Effect *provides(Effect::Feature ef);

    void drawWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data) override;

    void buildQuads(EffectWindow* w, WindowQuadList& quadList) override;

    void activateWindow(EffectWindow* c) override;
    EffectWindow* activeWindow() const override;
    void moveWindow(EffectWindow* w, const QPoint& pos, bool snap = false, double snapAdjust = 1.0) override;
    void windowToDesktop(EffectWindow* w, int desktop) override;
    void windowToScreen(EffectWindow* w, int screen) override;
    void setShowingDesktop(bool showing) override;

    QString currentActivity() const override;
    int currentDesktop() const override;
    int numberOfDesktops() const override;
    void setCurrentDesktop(int desktop) override;
    void setNumberOfDesktops(int desktops) override;
    QSize desktopGridSize() const override;
    int desktopGridWidth() const override;
    int desktopGridHeight() const override;
    int workspaceWidth() const override;
    int workspaceHeight() const override;
    int desktopAtCoords(QPoint coords) const override;
    QPoint desktopGridCoords(int id) const override;
    QPoint desktopCoords(int id) const override;
    int desktopAbove(int desktop = 0, bool wrap = true) const override;
    int desktopToRight(int desktop = 0, bool wrap = true) const override;
    int desktopBelow(int desktop = 0, bool wrap = true) const override;
    int desktopToLeft(int desktop = 0, bool wrap = true) const override;
    QString desktopName(int desktop) const override;
    bool optionRollOverDesktops() const override;

    QPoint cursorPos() const override;
    bool grabKeyboard(Effect* effect) override;
    void ungrabKeyboard() override;
    // not performing XGrabPointer
    void startMouseInterception(Effect *effect, Qt::CursorShape shape) override;
    void stopMouseInterception(Effect *effect) override;
    void* getProxy(QString name) override;
    void startMousePolling() override;
    void stopMousePolling() override;
    EffectWindow* findWindow(WId id) const override;
    EffectWindowList stackingOrder() const override;
    void setElevatedWindow(EffectWindow* w, bool set) override;

    void setTabBoxWindow(EffectWindow*) override;
    void setTabBoxDesktop(int) override;
    EffectWindowList currentTabBoxWindowList() const override;
    void refTabBox() override;
    void unrefTabBox() override;
    void closeTabBox() override;
    QList< int > currentTabBoxDesktopList() const override;
    int currentTabBoxDesktop() const override;
    EffectWindow* currentTabBoxWindow() const override;

    void setActiveFullScreenEffect(Effect* e) override;
    Effect* activeFullScreenEffect() const override;

    void addRepaintFull() override;
    void addRepaint(const QRect& r) override;
    void addRepaint(const QRegion& r) override;
    void addRepaint(int x, int y, int w, int h) override;
    int activeScreen() const override;
    int numScreens() const override;
    int screenNumber(const QPoint& pos) const override;
    QRect clientArea(clientAreaOption, int screen, int desktop) const override;
    QRect clientArea(clientAreaOption, const EffectWindow* c) const override;
    QRect clientArea(clientAreaOption, const QPoint& p, int desktop) const override;
    QSize virtualScreenSize() const override;
    QRect virtualScreenGeometry() const override;
    double animationTimeFactor() const override;
    WindowQuadType newWindowQuadType() override;

    void defineCursor(Qt::CursorShape shape) override;
    bool checkInputWindowEvent(xcb_button_press_event_t *e);
    bool checkInputWindowEvent(xcb_motion_notify_event_t *e);
    void checkInputWindowStacking();

    void reserveElectricBorder(ElectricBorder border, Effect *effect) override;
    void unreserveElectricBorder(ElectricBorder border, Effect *effect) override;

    unsigned long xrenderBufferPicture() override;
    QPainter* scenePainter() override;
    void reconfigure() override;
    void registerPropertyType(long atom, bool reg) override;
    QByteArray readRootProperty(long atom, long type, int format) const override;
    void deleteRootProperty(long atom) const override;
    xcb_atom_t announceSupportProperty(const QByteArray& propertyName, Effect* effect) override;
    void removeSupportProperty(const QByteArray& propertyName, Effect* effect) override;

    bool hasDecorationShadows() const override;

    bool decorationsHaveAlpha() const override;

    bool decorationSupportsBlurBehind() const override;

    EffectFrame* effectFrame(EffectFrameStyle style, bool staticSize, const QPoint& position, Qt::Alignment alignment) const override;

    QVariant kwinOption(KWinOption kwopt) override;
    bool isScreenLocked() const override;

    bool makeOpenGLContextCurrent() override;
    void doneOpenGLContextCurrent() override;

    // internal (used by kwin core or compositing code)
    void startPaint();
    void grabbedKeyboardEvent(QKeyEvent* e);
    bool hasKeyboardGrab() const;
    void desktopResized(const QSize &size);

    void reloadEffect(Effect *effect) override;
    QStringList loadedEffects() const;
    QStringList listOfEffects() const;

    QList<EffectWindow*> elevatedWindows() const;
    QStringList activeEffects() const;

    /**
     * @returns Whether we are currently in a desktop rendering process triggered by paintDesktop hook
     **/
    bool isDesktopRendering() const {
        return m_desktopRendering;
    }
    /**
     * @returns the desktop currently being rendered in the paintDesktop hook.
     **/
    int currentRenderedDesktop() const {
        return m_currentRenderedDesktop;
    }

public Q_SLOTS:
    void slotCurrentTabAboutToChange(EffectWindow* from, EffectWindow* to);
    void slotTabAdded(EffectWindow* from, EffectWindow* to);
    void slotTabRemoved(EffectWindow* c, EffectWindow* newActiveWindow);

    // slots for D-Bus interface
    Q_SCRIPTABLE void reconfigureEffect(const QString& name);
    Q_SCRIPTABLE bool loadEffect(const QString& name, bool checkDefault = false);
    Q_SCRIPTABLE void toggleEffect(const QString& name);
    Q_SCRIPTABLE void unloadEffect(const QString& name);
    Q_SCRIPTABLE bool isEffectLoaded(const QString& name) const;
    Q_SCRIPTABLE QString supportInformation(const QString& name) const;
    Q_SCRIPTABLE QString debug(const QString& name, const QString& parameter = QString()) const;

protected Q_SLOTS:
    void slotDesktopChanged(int old, KWin::Client *withClient);
    void slotDesktopPresenceChanged(KWin::Client *c, int old);
    void slotClientAdded(KWin::Client *c);
    void slotClientShown(KWin::Toplevel*);
    void slotUnmanagedAdded(KWin::Unmanaged *u);
    void slotUnmanagedShown(KWin::Toplevel*);
    void slotWindowClosed(KWin::Toplevel *c);
    void slotClientActivated(KWin::Client *c);
    void slotDeletedRemoved(KWin::Deleted *d);
    void slotClientMaximized(KWin::Client *c, KDecorationDefines::MaximizeMode maxMode);
    void slotClientStartUserMovedResized(KWin::Client *c);
    void slotClientStepUserMovedResized(KWin::Client *c, const QRect &geometry);
    void slotClientFinishUserMovedResized(KWin::Client *c);
    void slotOpacityChanged(KWin::Toplevel *t, qreal oldOpacity);
    void slotClientMinimized(KWin::Client *c, bool animate);
    void slotClientUnminimized(KWin::Client *c, bool animate);
    void slotClientModalityChanged();
    void slotGeometryShapeChanged(KWin::Toplevel *t, const QRect &old);
    void slotPaddingChanged(KWin::Toplevel *t, const QRect &old);
    void slotWindowDamaged(KWin::Toplevel *t, const QRect& r);
    void slotPropertyNotify(KWin::Toplevel *t, long atom);
    void slotPropertyNotify(long atom);

protected:
    bool loadScriptedEffect(const QString &name, KService *service);
    KLibrary* findEffectLibrary(KService* service);
    void effectsChanged();
    void setupClientConnections(KWin::Client *c);
    void setupUnmanagedConnections(KWin::Unmanaged *u);

    Effect* keyboard_grab_effect;
    Effect* fullscreen_effect;
    QList<EffectWindow*> elevated_windows;
    QMultiMap< int, EffectPair > effect_order;
    QHash< long, int > registered_atoms;
    int next_window_quad_type;

private Q_SLOTS:
    void slotEffectsQueried();

private:
    typedef QVector< Effect*> EffectsList;
    typedef EffectsList::const_iterator EffectsIterator;
    Effect *loadBuiltInEffect(const QByteArray &name, bool checkDefault);
    EffectsList m_activeEffects;
    EffectsIterator m_currentDrawWindowIterator;
    EffectsIterator m_currentPaintWindowIterator;
    EffectsIterator m_currentPaintEffectFrameIterator;
    EffectsIterator m_currentPaintScreenIterator;
    EffectsIterator m_currentBuildQuadsIterator;
    typedef QHash< QByteArray, QList< Effect*> > PropertyEffectMap;
    PropertyEffectMap m_propertiesForEffects;
    QHash<QByteArray, qulonglong> m_managedProperties;
    Compositor *m_compositor;
    Scene *m_scene;
    ScreenLockerWatcher *m_screenLockerWatcher;
    bool m_desktopRendering;
    int m_currentRenderedDesktop;
    Xcb::Window m_mouseInterceptionWindow;
    QList<Effect*> m_grabbedMouseEffects;
    EffectLoader *m_effectLoader;
};

class EffectWindowImpl : public EffectWindow
{
    Q_OBJECT
public:
    explicit EffectWindowImpl(Toplevel *toplevel);
    virtual ~EffectWindowImpl();

    void enablePainting(int reason) override;
    void disablePainting(int reason) override;
    bool isPaintingEnabled() override;

    void refWindow() override;
    void unrefWindow() override;

    const EffectWindowGroup* group() const override;

    QRegion shape() const override;
    QRect decorationInnerRect() const override;
    QByteArray readProperty(long atom, long type, int format) const override;
    void deleteProperty(long atom) const override;

    EffectWindow* findModal() override;
    EffectWindowList mainWindows() const override;

    WindowQuadList buildQuads(bool force = false) const override;

    void referencePreviousWindowPixmap() override;
    void unreferencePreviousWindowPixmap() override;

    const Toplevel* window() const;
    Toplevel* window();

    void setWindow(Toplevel* w);   // internal
    void setSceneWindow(Scene::Window* w);   // internal
    const Scene::Window* sceneWindow() const; // internal
    Scene::Window* sceneWindow(); // internal

    void elevate(bool elevate);

    void setData(int role, const QVariant &data);
    QVariant data(int role) const;

    void registerThumbnail(AbstractThumbnailItem *item);
    QHash<WindowThumbnailItem*, QWeakPointer<EffectWindowImpl> > const &thumbnails() const {
        return m_thumbnails;
    }
    QList<DesktopThumbnailItem*> const &desktopThumbnails() const {
        return m_desktopThumbnails;
    }
private Q_SLOTS:
    void thumbnailDestroyed(QObject *object);
    void thumbnailTargetChanged();
    void desktopThumbnailDestroyed(QObject *object);
private:
    void insertThumbnail(WindowThumbnailItem *item);
    Toplevel* toplevel;
    Scene::Window* sw; // This one is used only during paint pass.
    QHash<int, QVariant> dataMap;
    QHash<WindowThumbnailItem*, QWeakPointer<EffectWindowImpl> > m_thumbnails;
    QList<DesktopThumbnailItem*> m_desktopThumbnails;
};

class EffectWindowGroupImpl
    : public EffectWindowGroup
{
public:
    explicit EffectWindowGroupImpl(Group* g);
    EffectWindowList members() const override;
private:
    Group* group;
};

class EffectFrameImpl
    : public QObject, public EffectFrame
{
    Q_OBJECT
public:
    explicit EffectFrameImpl(EffectFrameStyle style, bool staticSize = true, QPoint position = QPoint(-1, -1),
                             Qt::Alignment alignment = Qt::AlignCenter);
    virtual ~EffectFrameImpl();

    void free() override;
    void render(QRegion region = infiniteRegion(), double opacity = 1.0, double frameOpacity = 1.0) override;
    Qt::Alignment alignment() const override;
    void setAlignment(Qt::Alignment alignment) override;
    const QFont& font() const override;
    void setFont(const QFont& font) override;
    const QRect& geometry() const override;
    void setGeometry(const QRect& geometry, bool force = false) override;
    const QIcon& icon() const override;
    void setIcon(const QIcon& icon) override;
    const QSize& iconSize() const override;
    void setIconSize(const QSize& size) override;
    void setPosition(const QPoint& point) override;
    const QString& text() const override;
    void setText(const QString& text) override;
    EffectFrameStyle style() const override {
        return m_style;
    };
    Plasma::FrameSvg& frame() {
        return m_frame;
    }
    bool isStatic() const {
        return m_static;
    };
    void finalRender(QRegion region, double opacity, double frameOpacity) const;
    void setShader(GLShader* shader) override {
        m_shader = shader;
    }
    GLShader* shader() const override {
        return m_shader;
    }
    void setSelection(const QRect& selection) override;
    const QRect& selection() const {
        return m_selectionGeometry;
    }
    Plasma::FrameSvg& selectionFrame() {
        return m_selection;
    }
    /**
     * The foreground text color as specified by the default Plasma theme.
     */
    QColor styledTextColor();

private Q_SLOTS:
    void plasmaThemeChanged();

private:
    Q_DISABLE_COPY(EffectFrameImpl)   // As we need to use Qt slots we cannot copy this class
    void align(QRect &geometry);   // positions geometry around m_point respecting m_alignment
    void autoResize(); // Auto-resize if not a static size

    EffectFrameStyle m_style;
    Plasma::FrameSvg m_frame; // TODO: share between all EffectFrames
    Plasma::FrameSvg m_selection;

    // Position
    bool m_static;
    QPoint m_point;
    Qt::Alignment m_alignment;
    QRect m_geometry;

    // Contents
    QString m_text;
    QFont m_font;
    QIcon m_icon;
    QSize m_iconSize;
    QRect m_selectionGeometry;

    Scene::EffectFrame* m_sceneFrame;
    GLShader* m_shader;

    Plasma::Theme *m_theme;
};

class ScreenLockerWatcher : public QObject
{
    Q_OBJECT
public:
    explicit ScreenLockerWatcher(QObject *parent = 0);
    virtual ~ScreenLockerWatcher();
    bool isLocked() const {
        return m_locked;
    }
Q_SIGNALS:
    void locked(bool locked);
private Q_SLOTS:
    void setLocked(bool activated);
    void activeQueried(QDBusPendingCallWatcher *watcher);
    void serviceOwnerChanged(const QString &serviceName, const QString &oldOwner, const QString &newOwner);
    void serviceRegisteredQueried();
    void serviceOwnerQueried();
private:
    OrgFreedesktopScreenSaverInterface *m_interface;
    QDBusServiceWatcher *m_serviceWatcher;
    bool m_locked;
};

class EffectLoader : public QObject
{
    Q_OBJECT
public:
    explicit EffectLoader(EffectsHandlerImpl *parent);
    virtual ~EffectLoader();

    void queue(const QString &effect, bool checkDefault = false);
private Q_SLOTS:
    void dequeue();
private:
    void scheduleDequeue();
    EffectsHandlerImpl *m_effects;
    QQueue<QPair<QString, bool>> m_queue;
    bool m_dequeueScheduled;
};

inline
QList<EffectWindow*> EffectsHandlerImpl::elevatedWindows() const
{
    return elevated_windows;
}


inline
EffectWindowGroupImpl::EffectWindowGroupImpl(Group* g)
    : group(g)
{
}

EffectWindow* effectWindow(Toplevel* w);
EffectWindow* effectWindow(Scene::Window* w);

inline
const Scene::Window* EffectWindowImpl::sceneWindow() const
{
    return sw;
}

inline
Scene::Window* EffectWindowImpl::sceneWindow()
{
    return sw;
}

inline
const Toplevel* EffectWindowImpl::window() const
{
    return toplevel;
}

inline
Toplevel* EffectWindowImpl::window()
{
    return toplevel;
}


} // namespace

#endif