/********************************************************************
Copyright 2014  Martin Gräßlin <mgraesslin@kde.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) version 3, or any
later version accepted by the membership of KDE e.V. (or its
successor approved by the membership of KDE e.V.), which shall
act as a proxy defined in Section 6 of version 3 of the license.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef WAYLAND_SERVER_SEAT_INTERFACE_H
#define WAYLAND_SERVER_SEAT_INTERFACE_H

#include <QHash>
#include <QObject>
#include <QPoint>

#include <wayland-server.h>

#include <kwaylandserver_export.h>

namespace KWayland
{
namespace Server
{

class Display;
class KeyboardInterface;
class PointerInterface;
class SurfaceInterface;

class KWAYLANDSERVER_EXPORT SeatInterface : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
    Q_PROPERTY(bool pointer READ hasPointer WRITE setHasPointer NOTIFY hasPointerChanged)
    Q_PROPERTY(bool keyboard READ hasKeyboard WRITE setHasKeyboard NOTIFY hasKeyboardChanged)
    Q_PROPERTY(bool tourch READ hasTouch WRITE setHasTouch NOTIFY hasTouchChanged)
public:
    virtual ~SeatInterface();

    void create();
    void destroy();
    bool isValid() const {
        return m_seat != nullptr;
    }

    const QString &name() const {
        return m_name;
    }
    bool hasPointer() const {
        return m_pointer;
    }
    bool hasKeyboard() const {
        return m_keyboard;
    }
    bool hasTouch() const {
        return m_touch;
    }
    PointerInterface *pointer() {
        return m_pointerInterface;
    }
    KeyboardInterface *keyboard() {
        return m_keyboardInterface;
    }

    void setName(const QString &name);
    void setHasPointer(bool has);
    void setHasKeyboard(bool has);
    void setHasTouch(bool has);

Q_SIGNALS:
    void nameChanged(const QString&);
    void hasPointerChanged(bool);
    void hasKeyboardChanged(bool);
    void hasTouchChanged(bool);

private:
    friend class Display;
    explicit SeatInterface(Display *display, QObject *parent);

    static void bind(wl_client *client, void *data, uint32_t version, uint32_t id);
    static void unbind(wl_resource *r);

    // interface
    static void getPointerCallback(wl_client *client, wl_resource *resource, uint32_t id);
    static void getKeyboardCallback(wl_client *client, wl_resource *resource, uint32_t id);
    static void getTouchCallback(wl_client *client, wl_resource *resource, uint32_t id);

    static SeatInterface *cast(wl_resource *r);
    void bind(wl_client *client, uint32_t version, uint32_t id);
    void sendCapabilities(wl_resource *r);
    void sendName(wl_resource *r);

    Display *m_display;
    wl_global *m_seat;
    QString m_name;
    bool m_pointer;
    bool m_keyboard;
    bool m_touch;
    QList<wl_resource*> m_resources;
    PointerInterface *m_pointerInterface;
    KeyboardInterface *m_keyboardInterface;
    static const struct wl_seat_interface s_interface;
};

class KWAYLANDSERVER_EXPORT PointerInterface : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QPoint globalPos READ globalPos WRITE setGlobalPos NOTIFY globalPosChanged)
public:
    virtual ~PointerInterface();

    void createInterface(wl_client *client, wl_resource *parentResource, uint32_t id);

    void updateTimestamp(quint32 time);
    void setGlobalPos(const QPoint &pos);
    const QPoint &globalPos() const {
        return m_globalPos;
    }
    void buttonPressed(quint32 button);
    void buttonReleased(quint32 button);
    bool isButtonPressed(quint32 button) const;
    quint32 buttonSerial(quint32 button) const;
    void axis(Qt::Orientation orientation, quint32 delta);

    void setFocusedSurface(SurfaceInterface *surface, const QPoint &surfacePosition = QPoint());
    void setFocusedSurfacePosition(const QPoint &surfacePosition);
    SurfaceInterface *focusedSurface() const {
        return m_focusedSurface.surface;
    }
    const QPoint &focusedSurfacePosition() const {
        return m_focusedSurface.offset;
    }

Q_SIGNALS:
    void globalPosChanged(const QPoint &pos);

private:
    friend class SeatInterface;
    explicit PointerInterface(Display *display, SeatInterface *parent);
    wl_resource *pointerForSurface(SurfaceInterface *surface) const;
    void surfaceDeleted();
    void updateButtonSerial(quint32 button, quint32 serial);
    enum class ButtonState {
        Released,
        Pressed
    };
    void updateButtonState(quint32 button, ButtonState state);

    static PointerInterface *cast(wl_resource *resource) {
        return reinterpret_cast<PointerInterface*>(wl_resource_get_user_data(resource));
    }

    static void unbind(wl_resource *resource);
    // interface
    static void setCursorCallback(wl_client *client, wl_resource *resource, uint32_t serial,
                                  wl_resource *surface, int32_t hotspot_x, int32_t hotspot_y);
    // since version 3
    static void releaseCallback(wl_client *client, wl_resource *resource);

    Display *m_display;
    SeatInterface *m_seat;
    struct ResourceData {
        wl_client *client = nullptr;
        wl_resource *pointer = nullptr;
    };
    QList<ResourceData> m_resources;
    quint32 m_eventTime;
    QPoint m_globalPos;
    struct FocusedSurface {
        SurfaceInterface *surface = nullptr;
        QPoint offset = QPoint();
        wl_resource *pointer = nullptr;
        quint32 serial = 0;
    };
    FocusedSurface m_focusedSurface;
    QHash<quint32, quint32> m_buttonSerials;
    QHash<quint32, ButtonState> m_buttonStates;

    static const struct wl_pointer_interface s_interface;
};

class KWAYLANDSERVER_EXPORT KeyboardInterface : public QObject
{
    Q_OBJECT
public:
    virtual ~KeyboardInterface();

    void createInterfae(wl_client *client, wl_resource *parentResource, uint32_t id);

    void updateTimestamp(quint32 time);
    void setKeymap(int fd, quint32 size);
    void keyPressed(quint32 key);
    void keyReleased(quint32 key);
    void updateModifiers(quint32 depressed, quint32 latched, quint32 locked, quint32 group);

    void setFocusedSurface(SurfaceInterface *surface);
    SurfaceInterface *focusedSurface() const {
        return m_focusedSurface.surface;
    }

private:
    friend class SeatInterface;
    explicit KeyboardInterface(Display *display, SeatInterface *parent);
    void surfaceDeleted();
    wl_resource *keyboardForSurface(SurfaceInterface *surface) const;
    void sendKeymap(wl_resource *r);
    void sendKeymapToAll();
    void sendModifiers(wl_resource *r);
    enum class KeyState {
        Released,
        Pressed
    };
    void updateKey(quint32 key, KeyState state);

    static KeyboardInterface *cast(wl_resource *resource) {
        return reinterpret_cast<KeyboardInterface*>(wl_resource_get_user_data(resource));
    }

    static void unbind(wl_resource *resource);
    // since version 3
    static void releaseCallback(wl_client *client, wl_resource *resource);

    Display *m_display;
    SeatInterface *m_seat;
    struct ResourceData {
        wl_client *client = nullptr;
        wl_resource *keyboard = nullptr;
    };
    QList<ResourceData> m_resources;
    struct Keymap {
        int fd = -1;
        quint32 size = 0;
        bool xkbcommonCompatible = false;
    };
    Keymap m_keymap;
    struct Modifiers {
        quint32 depressed = 0;
        quint32 latched = 0;
        quint32 locked = 0;
        quint32 group = 0;
    };
    Modifiers m_modifiers;
    struct FocusedSurface {
        SurfaceInterface *surface = nullptr;
        wl_resource *keyboard = nullptr;
    };
    FocusedSurface m_focusedSurface;
    QHash<quint32, KeyState> m_keyStates;
    quint32 m_eventTime;

    static const struct wl_keyboard_interface s_interface;
};

}
}

#endif