/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
 *           (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
 *           (C) 2002 Apple Computer, Inc.
 *           (C) 2010 Maksim Orlovich (maksim@kde.org)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef _DOM_EventsImpl_h_
#define _DOM_EventsImpl_h_

#include "dom/dom2_events.h"
#include "xml/dom2_viewsimpl.h"
#include "misc/idstring.h"
#include "misc/enum.h"
#include <QDateTime>
#include <QWeakPointer>

#undef FOCUS_EVENT //for win32

class QMouseEvent;
class QKeyEvent;
class KHTMLPart;

namespace DOM
{

class AbstractViewImpl;
class DOMStringImpl;
class NodeImpl;
class DocumentImpl;

class RegisteredEventListener
{
public:
    RegisteredEventListener() : useCapture(false), listener(nullptr) {}

    RegisteredEventListener(EventName _id, EventListener *_listener, bool _useCapture)
        : eventName(_id), useCapture(_useCapture), listener(_listener)
    {
        if (listener) {
            listener->ref();
        }
    }

    ~RegisteredEventListener()
    {
        if (listener) {
            listener->deref();
        } listener = nullptr;
    }

    bool operator==(const RegisteredEventListener &other) const
    {
        return eventName == other.eventName && listener == other.listener
               && useCapture == other.useCapture;
    }

    EventName eventName;
    bool useCapture;
    EventListener *listener;

    RegisteredEventListener(const RegisteredEventListener &other) :
        eventName(other.eventName), useCapture(other.useCapture), listener(other.listener)
    {
        if (listener) {
            listener->ref();
        }
    }

    RegisteredEventListener &operator=(const RegisteredEventListener &other)
    {
        eventName  = other.eventName;
        useCapture = other.useCapture;
        if (other.listener) {
            other.listener->ref();
        }
        if (listener) {
            listener->deref();
        }
        listener = other.listener;
        return *this;
    }
};

struct RegisteredListenerList {
    RegisteredListenerList() : listeners(nullptr)
    {}

    ~RegisteredListenerList();

    void addEventListener(EventName id, EventListener *listener, const bool useCapture);
    void removeEventListener(EventName id, EventListener *listener, bool useCapture);

    void setHTMLEventListener(EventName id, EventListener *listener);
    EventListener *getHTMLEventListener(EventName id);

    bool hasEventListener(EventName id);
    void clear();

    // TODO: remove/deprecate?
    bool stillContainsListener(const RegisteredEventListener &listener);

    QList<RegisteredEventListener> *listeners;//The actual listener list - may be 0
private:
    bool isHTMLEventListener(EventListener *listener);
};

class EventTargetImpl : public khtml::TreeShared<EventTargetImpl>
{
public:
    enum Type {
        DOM_NODE,
        WINDOW,
        XML_HTTP_REQUEST
    };

    virtual Type eventTargetType() const = 0;

    /* Override this to provide access to associated document in order to
     * set appropriate 'has listerner' flags
     */
    virtual DocumentImpl *eventTargetDocument();

    /**
     * Perform the default action for an event e.g. submitting a form
     */
    virtual void defaultEventHandler(EventImpl *evt);

    /*
     * This method fires all the registered handlers for this event
     * (checking the capture flag as well(
     */
    void handleLocalEvents(EventImpl *evt, bool useCapture);

    void addEventListener(EventName id, EventListener *listener, const bool useCapture);
    void removeEventListener(EventName id, EventListener *listener, bool useCapture);
    void setHTMLEventListener(EventName id, EventListener *listener);
    void setHTMLEventListener(unsigned id, EventListener *listener);
    EventListener *getHTMLEventListener(EventName id);
    EventListener *getHTMLEventListener(unsigned id);

    RegisteredListenerList &listenerList()
    {
        return m_regdListeners;
    }
private:
    void setDocListenerFlag(unsigned flag);
    RegisteredListenerList m_regdListeners;
};

class EventImpl : public khtml::Shared<EventImpl>
{
public:
    enum EventId {
        // UI events
        DOMFOCUSIN_EVENT,
        DOMFOCUSOUT_EVENT,
        DOMACTIVATE_EVENT,
        // Mouse events
        CLICK_EVENT,
        MOUSEDOWN_EVENT,
        MOUSEUP_EVENT,
        MOUSEOVER_EVENT,
        MOUSEMOVE_EVENT,
        MOUSEOUT_EVENT,
        // Mutation events
        DOMSUBTREEMODIFIED_EVENT,
        DOMNODEINSERTED_EVENT,
        DOMNODEREMOVED_EVENT,
        DOMNODEREMOVEDFROMDOCUMENT_EVENT,
        DOMNODEINSERTEDINTODOCUMENT_EVENT,
        DOMATTRMODIFIED_EVENT,
        DOMCHARACTERDATAMODIFIED_EVENT,
        // HTML events
        LOAD_EVENT,
        UNLOAD_EVENT,
        ABORT_EVENT,
        ERROR_EVENT,
        SELECT_EVENT,
        CHANGE_EVENT,
        SUBMIT_EVENT,
        RESET_EVENT,
        FOCUS_EVENT,
        BLUR_EVENT,
        RESIZE_EVENT,
        SCROLL_EVENT,
        HASHCHANGE_EVENT,
        // keyboard events
        KEYDOWN_EVENT,
        KEYUP_EVENT,
        KEYPRESS_EVENT, //Mostly corresponds to DOM3 textInput event.
        // khtml events (not part of DOM)
        KHTML_ECMA_DBLCLICK_EVENT, // for html ondblclick
        KHTML_ECMA_CLICK_EVENT, // for html onclick
        KHTML_DRAGDROP_EVENT,
        KHTML_MOVE_EVENT,
        KHTML_MOUSEWHEEL_EVENT,
        KHTML_CONTENTLOADED_EVENT,
        // XMLHttpRequest events
        KHTML_READYSTATECHANGE_EVENT,
        // HTML5 events
        MESSAGE_EVENT
    };

    EventImpl();
    EventImpl(EventId id, bool canBubbleArg, bool cancelableArg);
    virtual ~EventImpl();

    EventId id() const
    {
        return EventId(m_eventName.id());
    }
    DOMString type() const
    {
        return m_eventName.toString();
    }
    EventName name() const
    {
        return m_eventName;
    }

    EventTargetImpl *target() const
    {
        return m_target;
    }
    void setTarget(EventTargetImpl *_target);
    EventTargetImpl *currentTarget() const
    {
        return m_currentTarget;
    }
    void setCurrentTarget(EventTargetImpl *_currentTarget)
    {
        m_currentTarget = _currentTarget;
    }
    unsigned short eventPhase() const
    {
        return m_eventPhase;
    }
    void setEventPhase(unsigned short _eventPhase)
    {
        m_eventPhase = _eventPhase;
    }
    bool bubbles() const
    {
        return m_canBubble;
    }
    bool cancelable() const
    {
        return m_cancelable;
    }
    DOMTimeStamp timeStamp();
    void stopPropagation(bool stop)
    {
        m_propagationStopped = stop;
    }
    void preventDefault(bool prevent)
    {
        if (m_cancelable) {
            m_defaultPrevented = prevent;
        }
    }

    void initEvent(const DOMString &eventTypeArg, bool canBubbleArg, bool cancelableArg);

    virtual bool isUIEvent() const;
    virtual bool isMouseEvent() const;
    virtual bool isMutationEvent() const;
    virtual bool isTextInputEvent() const;
    virtual bool isKeyboardEvent() const;
    virtual bool isMessageEvent() const;
    virtual bool isHashChangeEvent() const;
    bool isKeyRelatedEvent() const
    {
        return isTextInputEvent() || isKeyboardEvent();
    }

    bool propagationStopped() const
    {
        return m_propagationStopped;
    }
    bool defaultPrevented() const
    {
        return m_defaultPrevented;
    }

    void setDefaultHandled()
    {
        m_defaultHandled = true;
    }
    bool defaultHandled() const
    {
        return m_defaultHandled;
    }

    DOMString message() const
    {
        return m_message;
    }
    void setMessage(const DOMString &_message)
    {
        m_message = _message;
    }

    static khtml::IDTable<EventImpl> *idTable()
    {
        if (s_idTable) {
            return s_idTable;
        } else {
            return initIdTable();
        }
    }
protected:
    static khtml::IDTable<EventImpl> *s_idTable;
    static khtml::IDTable<EventImpl> *initIdTable();
    EventName m_eventName;
    bool m_canBubble  : 1;
    bool m_cancelable : 1;

    bool m_propagationStopped : 1;
    bool m_defaultPrevented   : 1;
    bool m_defaultHandled     : 1;
    unsigned short m_eventPhase : 2;
    EventTargetImpl *m_currentTarget; // ref > 0 maintained externally
    EventTargetImpl *m_target;
    QDateTime m_createTime;
    DOMString m_message;
};

class UIEventImpl : public EventImpl
{
public:
    UIEventImpl() : m_view(nullptr), m_detail(0) {}
    UIEventImpl(EventId _id,
                bool canBubbleArg,
                bool cancelableArg,
                AbstractViewImpl *viewArg,
                long detailArg);
    virtual ~UIEventImpl();
    AbstractViewImpl *view() const
    {
        return m_view;
    }
    long detail() const
    {
        return m_detail;
    }
    void initUIEvent(const DOMString &typeArg,
                     bool canBubbleArg,
                     bool cancelableArg,
                     AbstractViewImpl *viewArg,
                     long detailArg);
    bool isUIEvent() const override;

    //Compat stuff
    virtual int keyCode() const
    {
        return 0;
    }
    virtual int charCode() const
    {
        return 0;
    }

    virtual long pageX() const
    {
        return 0;
    }
    virtual long pageY() const
    {
        return 0;
    }
    virtual long layerX() const
    {
        return 0;
    }
    virtual long layerY() const
    {
        return 0;
    }
    virtual int which() const
    {
        return 0;
    }
protected:
    AbstractViewImpl *m_view;
    long m_detail;

};

// Introduced in DOM Level 2: - internal
class MouseEventImpl : public UIEventImpl
{
public:
    enum Orientation {
        ONone = 0,
        OHorizontal,
        OVertical
    };

    MouseEventImpl();
    MouseEventImpl(EventId _id,
                   bool canBubbleArg,
                   bool cancelableArg,
                   AbstractViewImpl *viewArg,
                   long detailArg,
                   long screenXArg,
                   long screenYArg,
                   long clientXArg,
                   long clientYArg,
                   long pageXArg,
                   long pageYArg,
                   bool ctrlKeyArg,
                   bool altKeyArg,
                   bool shiftKeyArg,
                   bool metaKeyArg,
                   unsigned short buttonArg,
                   NodeImpl *relatedTargetArg,
                   QMouseEvent *qe = nullptr,
                   bool isDoubleClick = false,
                   Orientation orient = ONone);
    virtual ~MouseEventImpl();
    long screenX() const
    {
        return m_screenX;
    }
    long screenY() const
    {
        return m_screenY;
    }
    long clientX() const
    {
        return m_clientX;
    }
    long clientY() const
    {
        return m_clientY;
    }
    long layerX() const override
    {
        return m_layerX;    // non-DOM extension
    }
    long layerY() const override
    {
        return m_layerY;    // non-DOM extension
    }
    long pageX() const override
    {
        return m_pageX;    // non-DOM extension
    }
    long pageY() const override
    {
        return m_pageY;    // non-DOM extension
    }
    int which() const override
    {
        return button() + 1;    // non-DOM extension
    }
    bool isDoubleClick() const
    {
        return m_isDoubleClick;    // non-DOM extension
    }
    Orientation orientation() const
    {
        return KDE_CAST_BF_ENUM(Orientation, m_orientation);    // non-DOM extension
    }
    bool ctrlKey() const
    {
        return m_ctrlKey;
    }
    bool shiftKey() const
    {
        return m_shiftKey;
    }
    bool altKey() const
    {
        return m_altKey;
    }
    bool metaKey() const
    {
        return m_metaKey;
    }
    unsigned short button() const
    {
        return m_button;
    }
    NodeImpl *relatedTarget() const
    {
        return m_relatedTarget;
    }

    void computeLayerPos();

    void initMouseEvent(const DOMString &typeArg,
                        bool canBubbleArg,
                        bool cancelableArg,
                        AbstractViewImpl *viewArg,
                        long detailArg,
                        long screenXArg,
                        long screenYArg,
                        long clientXArg,
                        long clientYArg,
                        bool ctrlKeyArg,
                        bool altKeyArg,
                        bool shiftKeyArg,
                        bool metaKeyArg,
                        unsigned short buttonArg,
                        const Node &relatedTargetArg,
                        Orientation orient = ONone);
    bool isMouseEvent() const override;

    QMouseEvent *qEvent() const
    {
        return m_qevent;
    }
protected:
    long m_screenX;
    long m_screenY;
    long m_clientX;
    long m_clientY;
    long m_layerX;
    long m_layerY;
    long m_pageX;
    long m_pageY;
    bool m_ctrlKey : 1;
    bool m_altKey  : 1;
    bool m_shiftKey : 1;
    bool m_metaKey : 1;
    bool m_isDoubleClick : 1;
    KDE_BF_ENUM(Orientation) m_orientation : 2;
    unsigned short m_button;
    NodeImpl *m_relatedTarget;
    QMouseEvent *m_qevent;
};

class KeyEventBaseImpl : public UIEventImpl
{
public:
    // VirtualKeyCode
    enum KeyCodes  {
        DOM_VK_UNDEFINED           = 0x0,
        DOM_VK_RIGHT_ALT           = 0x12,
        DOM_VK_LEFT_ALT            = 0x12,
        DOM_VK_LEFT_CONTROL        = 0x11,
        DOM_VK_RIGHT_CONTROL       = 0x11,
        DOM_VK_LEFT_SHIFT          = 0x10,
        DOM_VK_RIGHT_SHIFT         = 0x10,
        DOM_VK_META            = 0x9D,
        DOM_VK_BACK_SPACE          = 0x08,
        DOM_VK_CAPS_LOCK           = 0x14,
        DOM_VK_INSERT          = 0x2D,
        DOM_VK_DELETE          = 0x7F,
        DOM_VK_END             = 0x23,
        DOM_VK_ENTER           = 0x0D,
        DOM_VK_ESCAPE          = 0x1B,
        DOM_VK_HOME            = 0x24,
        DOM_VK_NUM_LOCK            = 0x90,
        DOM_VK_PAUSE           = 0x13,
        DOM_VK_PRINTSCREEN         = 0x9A,
        DOM_VK_SCROLL_LOCK         = 0x91,
        DOM_VK_SPACE           = 0x20,
        DOM_VK_TAB             = 0x09,
        DOM_VK_LEFT            = 0x25,
        DOM_VK_RIGHT           = 0x27,
        DOM_VK_UP              = 0x26,
        DOM_VK_DOWN            = 0x28,
        DOM_VK_PAGE_DOWN           = 0x22,
        DOM_VK_PAGE_UP             = 0x21,
        DOM_VK_F1              = 0x70,
        DOM_VK_F2              = 0x71,
        DOM_VK_F3              = 0x72,
        DOM_VK_F4              = 0x73,
        DOM_VK_F5              = 0x74,
        DOM_VK_F6              = 0x75,
        DOM_VK_F7              = 0x76,
        DOM_VK_F8              = 0x77,
        DOM_VK_F9              = 0x78,
        DOM_VK_F10             = 0x79,
        DOM_VK_F11             = 0x7A,
        DOM_VK_F12             = 0x7B,
        DOM_VK_F13             = 0xF000,
        DOM_VK_F14             = 0xF001,
        DOM_VK_F15             = 0xF002,
        DOM_VK_F16             = 0xF003,
        DOM_VK_F17             = 0xF004,
        DOM_VK_F18             = 0xF005,
        DOM_VK_F19             = 0xF006,
        DOM_VK_F20             = 0xF007,
        DOM_VK_F21             = 0xF008,
        DOM_VK_F22             = 0xF009,
        DOM_VK_F23             = 0xF00A,
        DOM_VK_F24             = 0xF00B
    };

    void initKeyBaseEvent(const DOMString &typeArg,
                          bool canBubbleArg,
                          bool cancelableArg,
                          AbstractViewImpl *viewArg,
                          unsigned long keyVal,
                          unsigned long virtKeyVal,
                          unsigned long modifiers);

    bool ctrlKey()  const
    {
        return m_modifier & Qt::ControlModifier;
    }
    bool shiftKey() const
    {
        return m_modifier & Qt::ShiftModifier;
    }
    bool altKey()   const
    {
        return m_modifier & Qt::AltModifier;
    }
    bool metaKey()  const
    {
        return m_modifier & Qt::MetaModifier;
    }

    bool             inputGenerated() const
    {
        return m_virtKeyVal == 0;
    }
    unsigned long    keyVal() const
    {
        return m_keyVal;
    }
    unsigned long    virtKeyVal() const
    {
        return m_virtKeyVal;
    }

    QKeyEvent *qKeyEvent() const
    {
        if (!m_keyEvent) {
            buildQKeyEvent();
        } return m_keyEvent;
    }

    ~KeyEventBaseImpl();

    bool checkModifier(unsigned long modifierArg);

    int which() const override
    {
        return keyCode();    // non-DOM extension
    }

    //Returns true if the event was synthesized by client use of DOM
    bool isSynthetic() const
    {
        return m_synthetic;
    }
protected:
    KeyEventBaseImpl(): m_keyEvent(nullptr), m_keyVal(0), m_virtKeyVal(0), m_modifier(0), m_synthetic(false)
    {
        m_detail = 0;
    }

    KeyEventBaseImpl(EventId id,
                     bool canBubbleArg,
                     bool cancelableArg,
                     AbstractViewImpl *viewArg,
                     QKeyEvent *key);

    mutable QKeyEvent *m_keyEvent;
    unsigned long m_keyVal;     //Unicode key value
    unsigned long m_virtKeyVal; //Virtual key value for keys like arrows, Fn, etc.

    // bitfield containing state of modifiers. not part of the dom.
    unsigned long    m_modifier;

    bool             m_synthetic;

    void buildQKeyEvent() const; //Construct a Qt key event from m_keyVal/m_virtKeyVal
};

class TextEventImpl : public KeyEventBaseImpl
{
public:
    TextEventImpl();

    TextEventImpl(QKeyEvent *key, DOM::AbstractViewImpl *view);

    void initTextEvent(const DOMString &typeArg,
                       bool canBubbleArg,
                       bool cancelableArg,
                       AbstractViewImpl *viewArg,
                       const DOMString &text);

    bool isTextInputEvent() const override;

    //Legacy key stuff...
    int keyCode() const override;
    int charCode() const override;

    DOMString data() const
    {
        return m_outputString;
    }
private:
    DOMString m_outputString;
};

class KeyboardEventImpl : public KeyEventBaseImpl
{
public:
    KeyboardEventImpl();
    KeyboardEventImpl(QKeyEvent *key, DOM::AbstractViewImpl *view);

    bool isKeyboardEvent() const override;

    //Legacy key stuff...
    int keyCode() const override;
    int charCode() const override;

    DOMString     keyIdentifier() const;
    unsigned long keyLocation() const
    {
        return m_keyLocation;
    }

    bool getModifierState(const DOMString &keyIdentifierArg) const;

    void initKeyboardEvent(const DOMString &typeArg,
                           bool canBubbleArg,
                           bool cancelableArg,
                           AbstractViewImpl *viewArg,
                           const DOMString &keyIdentifierArg,
                           unsigned long keyLocationArg,
                           const DOMString &modifiersList);

private:
    unsigned long m_keyLocation;
};

class MutationEventImpl : public EventImpl
{
// ### fire these during parsing (if necessary)
public:
    MutationEventImpl();
    MutationEventImpl(EventId _id, /* for convenience */
                      bool canBubbleArg,
                      bool cancelableArg,
                      const Node &relatedNodeArg,
                      const DOMString &prevValueArg,
                      const DOMString &newValueArg,
                      const DOMString &attrNameArg,
                      unsigned short attrChangeArg);
    ~MutationEventImpl();

    Node relatedNode() const
    {
        return m_relatedNode;
    }
    DOMString prevValue() const
    {
        return m_prevValue;
    }
    DOMString newValue() const
    {
        return m_newValue;
    }
    DOMString attrName() const
    {
        return m_attrName;
    }
    unsigned short attrChange() const
    {
        return m_attrChange;
    }
    void initMutationEvent(const DOMString &typeArg,
                           bool canBubbleArg,
                           bool cancelableArg,
                           const Node &relatedNodeArg,
                           const DOMString &prevValueArg,
                           const DOMString &newValueArg,
                           const DOMString &attrNameArg,
                           unsigned short attrChangeArg);
    bool isMutationEvent() const override;
protected:
    NodeImpl *m_relatedNode;
    DOMStringImpl *m_prevValue;
    DOMStringImpl *m_newValue;
    DOMStringImpl *m_attrName;
    unsigned short m_attrChange;
};

class MessageEventImpl : public EventImpl
{
public:
    enum DataType {
        JS_VALUE
    };

    class Data : public khtml::Shared<Data>
    {
    public:
        virtual DataType messageDataType() const = 0;
        virtual ~Data() {}
    };

    RefPtr<Data> data() const
    {
        return m_data;
    }
    DOMString  origin() const
    {
        return m_origin;
    }
    KHTMLPart *source() const
    {
        return m_source.toStrongRef().data();
    }
    DOMString  lastEventId() const
    {
        return m_lastEventId;
    }

    MessageEventImpl();

    void initMessageEvent(const DOMString &eventTypeArg,
                          bool  canBubbleArg,
                          bool  cancelableArg,
                          const RefPtr<Data> &dataArg,
                          const DOMString &originArg,
                          const DOMString &lastEventIdArg,
                          KHTMLPart *sourceArg); // no message ports yet.
    bool isMessageEvent() const override;
private:
    RefPtr<Data> m_data;
    DOMString    m_origin;
    DOMString    m_lastEventId;
    QWeakPointer<KHTMLPart>  m_source;
};

class HashChangeEventImpl : public EventImpl
{
public:
    const DOMString &oldUrl() const
    {
        return m_oldUrl;
    }
    const DOMString &newUrl() const
    {
        return m_newUrl;
    }

    HashChangeEventImpl();

    void initHashChangeEvent(const DOMString &eventTypeArg,
                             bool  canBubbleArg,
                             bool  cancelableArg,
                             const DOMString &oldUrl,
                             const DOMString &newUrl
                            );
    bool isHashChangeEvent() const override;
private:
    DOMString    m_oldUrl;
    DOMString    m_newUrl;
};

} //namespace
#endif