/*
 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
 * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
 * Copyright (C) 2003, 2005, 2006, 2008, 2013 Apple Inc. All rights reserved.
 *
 * 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.
 */

#include "config.h"
#include "MouseEvent.h"

#include "DataTransfer.h"
#include "EventNames.h"
#include "Frame.h"
#include "FrameView.h"
#include "HTMLIFrameElement.h"
#include "PlatformMouseEvent.h"
#include <wtf/CurrentTime.h>

namespace WebCore {

Ref<MouseEvent> MouseEvent::createForBindings(const AtomicString& type, const MouseEventInit& initializer)
{
    return adoptRef(*new MouseEvent(type, initializer));
}

Ref<MouseEvent> MouseEvent::create(const AtomicString& eventType, AbstractView* view, const PlatformMouseEvent& event, int detail, PassRefPtr<Node> relatedTarget)
{
    bool isMouseEnterOrLeave = eventType == eventNames().mouseenterEvent || eventType == eventNames().mouseleaveEvent;
    bool isCancelable = eventType != eventNames().mousemoveEvent && !isMouseEnterOrLeave;
    bool canBubble = !isMouseEnterOrLeave;

    return MouseEvent::create(eventType, canBubble, isCancelable, event.timestamp(), view,
        detail, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
#if ENABLE(POINTER_LOCK)
        event.movementDelta().x(), event.movementDelta().y(),
#endif
        event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.button(),
        relatedTarget, event.force());
}

Ref<MouseEvent> MouseEvent::create(const AtomicString& type, bool canBubble, bool cancelable, double timestamp, AbstractView* view, int detail, int screenX, int screenY, int pageX, int pageY,
#if ENABLE(POINTER_LOCK)
    int movementX, int movementY,
#endif
    bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, PassRefPtr<EventTarget> relatedTarget, double force)

{
    return MouseEvent::create(type, canBubble, cancelable, timestamp, view,
        detail, screenX, screenY, pageX, pageY,
#if ENABLE(POINTER_LOCK)
        movementX, movementY,
#endif
        ctrlKey, altKey, shiftKey, metaKey, button, relatedTarget, force, 0, false);
}

Ref<MouseEvent> MouseEvent::create(const AtomicString& type, bool canBubble, bool cancelable, double timestamp, AbstractView* view, int detail, int screenX, int screenY, int pageX, int pageY,
#if ENABLE(POINTER_LOCK)
    int movementX, int movementY,
#endif
    bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, PassRefPtr<EventTarget> relatedTarget, double force, PassRefPtr<DataTransfer> dataTransfer, bool isSimulated)
{
    return adoptRef(*new MouseEvent(type, canBubble, cancelable, timestamp, view,
        detail, screenX, screenY, pageX, pageY,
#if ENABLE(POINTER_LOCK)
        movementX, movementY,
#endif
        ctrlKey, altKey, shiftKey, metaKey, button, relatedTarget, force, dataTransfer, isSimulated));
}

Ref<MouseEvent> MouseEvent::create(const AtomicString& eventType, bool canBubble, bool cancelable, AbstractView* view, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, PassRefPtr<EventTarget> relatedTarget)
{
    return adoptRef(*new MouseEvent(eventType, canBubble, cancelable, view, detail, screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey, button, relatedTarget));
}

MouseEvent::MouseEvent()
    : m_button(0)
    , m_buttonDown(false)
{
}

MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, double timestamp, AbstractView* view,
                       int detail, int screenX, int screenY, int pageX, int pageY,
#if ENABLE(POINTER_LOCK)
                       int movementX, int movementY,
#endif
                       bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
                       unsigned short button, PassRefPtr<EventTarget> relatedTarget, double force,
                       PassRefPtr<DataTransfer> dataTransfer, bool isSimulated)
    : MouseRelatedEvent(eventType, canBubble, cancelable, timestamp, view, detail, IntPoint(screenX, screenY),
                        IntPoint(pageX, pageY),
#if ENABLE(POINTER_LOCK)
                        IntPoint(movementX, movementY),
#endif
                        ctrlKey, altKey, shiftKey, metaKey, isSimulated)
    , m_button(button == (unsigned short)-1 ? 0 : button)
    , m_buttonDown(button != (unsigned short)-1)
    , m_relatedTarget(relatedTarget)
    , m_force(force)
    , m_dataTransfer(dataTransfer)
{
}

MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, AbstractView* view, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, PassRefPtr<EventTarget> relatedTarget)
    : MouseRelatedEvent(eventType, canBubble, cancelable, WTF::currentTime(), view, detail, IntPoint(screenX, screenY), IntPoint(0, 0),
#if ENABLE(POINTER_LOCK)
        IntPoint(0, 0),
#endif
        ctrlKey, altKey, shiftKey, metaKey, false)
    , m_button(button == (unsigned short)-1 ? 0 : button)
    , m_buttonDown(button != (unsigned short)-1)
    , m_relatedTarget(relatedTarget)
{
    initCoordinates(IntPoint(clientX, clientY));
}

MouseEvent::MouseEvent(const AtomicString& eventType, const MouseEventInit& initializer)
    : MouseRelatedEvent(eventType, initializer)
    , m_button(initializer.button == (unsigned short)-1 ? 0 : initializer.button)
    , m_buttonDown(initializer.button != (unsigned short)-1)
    , m_relatedTarget(initializer.relatedTarget)
    , m_dataTransfer(0 /* dataTransfer */)
{
    initCoordinates(IntPoint(initializer.clientX, initializer.clientY));
}

MouseEvent::~MouseEvent()
{
}

void MouseEvent::initMouseEvent(const AtomicString& type, bool canBubble, bool cancelable, AbstractView* view,
                                int detail, int screenX, int screenY, int clientX, int clientY,
                                bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
                                unsigned short button, PassRefPtr<EventTarget> relatedTarget)
{
    if (dispatched())
        return;

    initUIEvent(type, canBubble, cancelable, view, detail);

    m_screenLocation = IntPoint(screenX, screenY);
    m_ctrlKey = ctrlKey;
    m_altKey = altKey;
    m_shiftKey = shiftKey;
    m_metaKey = metaKey;
    m_button = button == (unsigned short)-1 ? 0 : button;
    m_buttonDown = button != (unsigned short)-1;
    m_relatedTarget = relatedTarget;

    initCoordinates(IntPoint(clientX, clientY));

    // FIXME: m_isSimulated is not set to false here.
    // FIXME: m_dataTransfer is not set to 0 here.
}

EventInterface MouseEvent::eventInterface() const
{
    return MouseEventInterfaceType;
}

bool MouseEvent::isMouseEvent() const
{
    return true;
}

bool MouseEvent::isDragEvent() const
{
    const AtomicString& t = type();
    return t == eventNames().dragenterEvent || t == eventNames().dragoverEvent || t == eventNames().dragleaveEvent || t == eventNames().dropEvent
               || t == eventNames().dragstartEvent|| t == eventNames().dragEvent || t == eventNames().dragendEvent;
}

bool MouseEvent::canTriggerActivationBehavior(const Event& event)
{
    return event.type() == eventNames().clickEvent && (!is<MouseEvent>(event) || downcast<MouseEvent>(event).button() != RightButton);
}

int MouseEvent::which() const
{
    // For the DOM, the return values for left, middle and right mouse buttons are 0, 1, 2, respectively.
    // For the Netscape "which" property, the return values for left, middle and right mouse buttons are 1, 2, 3, respectively. 
    // So we must add 1.
    if (!m_buttonDown)
        return 0;
    return m_button + 1;
}

Node* MouseEvent::toElement() const
{
    // MSIE extension - "the object toward which the user is moving the mouse pointer"
    if (type() == eventNames().mouseoutEvent || type() == eventNames().mouseleaveEvent) {
        EventTarget* relatedTarget = this->relatedTarget();
        return relatedTarget ? relatedTarget->toNode() : nullptr;
    }

    return target() ? target()->toNode() : nullptr;
}

Node* MouseEvent::fromElement() const
{
    // MSIE extension - "object from which activation or the mouse pointer is exiting during the event" (huh?)
    if (type() != eventNames().mouseoutEvent && type() != eventNames().mouseleaveEvent) {
        EventTarget* relatedTarget = this->relatedTarget();
        return relatedTarget ? relatedTarget->toNode() : nullptr;
    }

    return target() ? target()->toNode() : nullptr;
}

// FIXME: Fix positioning. e.g. We need to consider border/padding.
// https://bugs.webkit.org/show_bug.cgi?id=93696
inline static int adjustedClientX(int innerClientX, HTMLIFrameElement* iframe, FrameView* frameView)
{
    return iframe->offsetLeft() - frameView->scrollX() + innerClientX;
}

inline static int adjustedClientY(int innerClientY, HTMLIFrameElement* iframe, FrameView* frameView)
{
    return iframe->offsetTop() - frameView->scrollY() + innerClientY;
}

Ref<Event> MouseEvent::cloneFor(HTMLIFrameElement* iframe) const
{
    ASSERT(iframe);
    Frame* frame = iframe->document().frame();
    FrameView* frameView = frame ? frame->view() : nullptr;
    Ref<MouseEvent> clonedMouseEvent = MouseEvent::create(type(), bubbles(), cancelable(),
        iframe->document().defaultView(),
        detail(), screenX(), screenY(),
        frameView ? adjustedClientX(clientX(), iframe, frameView) : 0,
        frameView ? adjustedClientY(clientY(), iframe, frameView) : 0,
        ctrlKey(), altKey(), shiftKey(), metaKey(),
        button(),
        // Nullifies relatedTarget.
        0);
    clonedMouseEvent->setForce(force());
    return WTFMove(clonedMouseEvent);
}

} // namespace WebCore