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

    SPDX-FileCopyrightText: 2006 Lubos Lunak <l.lunak@kde.org>
    SPDX-FileCopyrightText: 2010 Sebastian Sauer <sebsauer@kdab.com>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#pragma once
#include "config-kwin.h"

#include "core/colorspace.h"
#include "effect/effect.h"
#include <QTime>
#include <QTimeLine>

namespace KWin
{

#if HAVE_ACCESSIBILITY
class ZoomAccessibilityIntegration;
#endif

class GLFramebuffer;
class GLTexture;
class GLVertexBuffer;

class ZoomEffect
    : public Effect
{
    Q_OBJECT
    Q_PROPERTY(qreal zoomFactor READ configuredZoomFactor)
    Q_PROPERTY(int mousePointer READ configuredMousePointer)
    Q_PROPERTY(int mouseTracking READ configuredMouseTracking)
    Q_PROPERTY(bool focusTrackingEnabled READ isFocusTrackingEnabled)
    Q_PROPERTY(bool textCaretTrackingEnabled READ isTextCaretTrackingEnabled)
    Q_PROPERTY(int focusDelay READ configuredFocusDelay)
    Q_PROPERTY(qreal moveFactor READ configuredMoveFactor)
    Q_PROPERTY(qreal targetZoom READ targetZoom)
public:
    ZoomEffect();
    ~ZoomEffect() override;
    void reconfigure(ReconfigureFlags flags) override;
    void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
    void paintScreen(const RenderTarget &renderTarget, const RenderViewport &viewport, int mask, const QRegion &region, Output *screen) override;
    void postPaintScreen() override;
    bool isActive() const override;
    int requestedEffectChainPosition() const override;
    // for properties
    qreal configuredZoomFactor() const;
    int configuredMousePointer() const;
    int configuredMouseTracking() const;
    bool isFocusTrackingEnabled() const;
    bool isTextCaretTrackingEnabled() const;
    int configuredFocusDelay() const;
    qreal configuredMoveFactor() const;
    qreal targetZoom() const;

private:
    bool screenExistsAt(const QPoint &point) const;
private Q_SLOTS:
    inline void zoomIn()
    {
        zoomIn(-1.0);
    };
    void zoomIn(double to);
    void zoomOut();
    void actualSize();
    void moveZoomLeft();
    void moveZoomRight();
    void moveZoomUp();
    void moveZoomDown();
    void moveMouseToFocus();
    void moveMouseToCenter();
    void timelineFrameChanged(int frame);
    void moveFocus(const QPoint &point);
    void slotMouseChanged(const QPointF &pos, const QPointF &old,
                          Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
                          Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers);
    void slotWindowAdded(EffectWindow *w);
    void slotWindowDamaged();
    void slotScreenRemoved(Output *screen);
    void setTargetZoom(double value);

private:
    void showCursor();
    void hideCursor();
    void moveZoom(int x, int y);

private:
    struct OffscreenData
    {
        std::unique_ptr<GLTexture> texture;
        std::unique_ptr<GLFramebuffer> framebuffer;
        QRect viewport;
        ColorDescription color = ColorDescription::sRGB;
    };

    GLTexture *ensureCursorTexture();
    OffscreenData *ensureOffscreenData(const RenderTarget &renderTarget, const RenderViewport &viewport, Output *screen);
    void markCursorTextureDirty();

#if HAVE_ACCESSIBILITY
    ZoomAccessibilityIntegration *m_accessibilityIntegration = nullptr;
#endif
    double zoom;
    double target_zoom;
    double source_zoom;
    double zoomFactor;
    enum MouseTrackingType {
        MouseTrackingProportional = 0,
        MouseTrackingCentered = 1,
        MouseTrackingPush = 2,
        MouseTrackingDisabled = 3,
    };
    MouseTrackingType mouseTracking;
    enum MousePointerType {
        MousePointerScale = 0,
        MousePointerKeep = 1,
        MousePointerHide = 2,
    };
    MousePointerType mousePointer;
    int focusDelay;
    QPoint cursorPoint;
    QPoint focusPoint;
    QPoint prevPoint;
    QTime lastMouseEvent;
    QTime lastFocusEvent;
    std::unique_ptr<GLTexture> m_cursorTexture;
    bool m_cursorTextureDirty = false;
    bool isMouseHidden;
    QTimeLine timeline;
    int xMove, yMove;
    double moveFactor;
    std::chrono::milliseconds lastPresentTime;
    std::map<Output *, OffscreenData> m_offscreenData;
};

} // namespace