/*
    SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
    SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>

    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#ifndef WAYLAND_SERVER_SURFACE_INTERFACE_P_H
#define WAYLAND_SERVER_SURFACE_INTERFACE_P_H

#include "surface_interface.h"
// Qt
#include <QHash>
#include <QVector>
// Wayland
#include "qwayland-server-wayland.h"

namespace KWaylandServer
{

class IdleInhibitorInterface;
class SurfaceRole;
class ViewportInterface;

class KWaylandFrameCallback : public QtWaylandServer::wl_callback
{
public:
    KWaylandFrameCallback(wl_resource *resource, SurfaceInterface *surface);

    void destroy();

    QPointer<SurfaceInterface> surface;

protected:
    void callback_destroy_resource(Resource *resource) override;
};

class SurfaceInterfacePrivate : public QtWaylandServer::wl_surface
{
public:
    struct State {
        QRegion damage = QRegion();
        QRegion bufferDamage = QRegion();
        QRegion opaque = QRegion();
        QRegion input = QRegion();
        QRectF sourceGeometry = QRectF();
        QSize destinationSize = QSize();
        QSize size = QSize();
        bool sourceGeometryIsSet = false;
        bool destinationSizeIsSet = false;
        bool inputIsSet = false;
        bool opaqueIsSet = false;
        bool bufferIsSet = false;
        bool shadowIsSet = false;
        bool blurIsSet = false;
        bool contrastIsSet = false;
        bool slideIsSet = false;
        bool inputIsInfinite = true;
        bool childrenChanged = false;
        bool bufferScaleIsSet = false;
        bool bufferTransformIsSet = false;
        qint32 bufferScale = 1;
        OutputInterface::Transform bufferTransform = OutputInterface::Transform::Normal;
        QList<KWaylandFrameCallback *> frameCallbacks;
        QPoint offset = QPoint();
        BufferInterface *buffer = nullptr;
        // stacking order: bottom (first) -> top (last)
        QList<QPointer<SubSurfaceInterface>> children;
        QPointer<ShadowInterface> shadow;
        QPointer<BlurInterface> blur;
        QPointer<ContrastInterface> contrast;
        QPointer<SlideInterface> slide;
    };

    static SurfaceInterfacePrivate *get(SurfaceInterface *surface) { return surface->d.data(); }

    explicit SurfaceInterfacePrivate(SurfaceInterface *q);
    ~SurfaceInterfacePrivate() override;

    void addChild(QPointer<SubSurfaceInterface> subsurface);
    void removeChild(QPointer<SubSurfaceInterface> subsurface);
    bool raiseChild(QPointer<SubSurfaceInterface> subsurface, SurfaceInterface *sibling);
    bool lowerChild(QPointer<SubSurfaceInterface> subsurface, SurfaceInterface *sibling);
    void setShadow(const QPointer<ShadowInterface> &shadow);
    void setBlur(const QPointer<BlurInterface> &blur);
    void setContrast(const QPointer<ContrastInterface> &contrast);
    void setSlide(const QPointer<SlideInterface> &slide);
    void installPointerConstraint(LockedPointerInterface *lock);
    void installPointerConstraint(ConfinedPointerInterface *confinement);
    void installIdleInhibitor(IdleInhibitorInterface *inhibitor);

    void commitSubSurface();
    void commit();
    QMatrix4x4 buildSurfaceToBufferMatrix(const State *state);

    CompositorInterface *compositor;
    SurfaceInterface *q;
    SurfaceRole *role = nullptr;

    State current;
    State pending;
    State subSurfacePending;
    QPointer<SubSurfaceInterface> subSurface;
    QRegion trackedDamage;
    QMatrix4x4 surfaceToBufferMatrix;
    QMatrix4x4 bufferToSurfaceMatrix;
    QSize bufferSize;

    // workaround for https://bugreports.qt.io/browse/QTBUG-52192
    // A subsurface needs to be considered mapped even if it doesn't have a buffer attached
    // Otherwise Qt's sub-surfaces will never be visible and the client will freeze due to
    // waiting on the frame callback of the never visible surface
    bool subSurfaceIsMapped = true;

    QVector<OutputInterface *> outputs;

    QPointer<LockedPointerInterface> lockedPointer;
    QPointer<ConfinedPointerInterface> confinedPointer;
    QHash<OutputInterface*, QMetaObject::Connection> outputDestroyedConnections;
    QVector<IdleInhibitorInterface*> idleInhibitors;
    ViewportInterface *viewportExtension = nullptr;
    SurfaceInterface *dataProxy = nullptr;

    static QList<SurfaceInterface *> surfaces;

protected:
    void surface_destroy_resource(Resource *resource) override;
    void surface_destroy(Resource *resource) override;
    void surface_attach(Resource *resource, struct ::wl_resource *buffer, int32_t x, int32_t y) override;
    void surface_damage(Resource *resource, int32_t x, int32_t y, int32_t width, int32_t height) override;
    void surface_frame(Resource *resource, uint32_t callback) override;
    void surface_set_opaque_region(Resource *resource, struct ::wl_resource *region) override;
    void surface_set_input_region(Resource *resource, struct ::wl_resource *region) override;
    void surface_commit(Resource *resource) override;
    void surface_set_buffer_transform(Resource *resource, int32_t transform) override;
    void surface_set_buffer_scale(Resource *resource, int32_t scale) override;
    void surface_damage_buffer(Resource *resource, int32_t x, int32_t y, int32_t width, int32_t height) override;

private:
    void swapStates(State *source, State *target, bool emitChanged);

    QMetaObject::Connection constrainsOneShotConnection;
    QMetaObject::Connection constrainsUnboundConnection;
};

} // namespace KWaylandServer

#endif