/*
 * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#if ENABLE(WORKERS)

#include "V8WorkerContextEventListener.h"

#include "Event.h"
#include "WorkerContextExecutionProxy.h"

namespace WebCore {

V8WorkerContextEventListener::V8WorkerContextEventListener(WorkerContextExecutionProxy* proxy, v8::Local<v8::Object> listener, bool isInline)
    : V8ObjectEventListener(0, listener, isInline)
    , m_proxy(proxy)
{
}

V8WorkerContextEventListener::~V8WorkerContextEventListener()
{
    if (m_proxy)
        m_proxy->RemoveEventListener(this);
    disposeListenerObject();
}

void V8WorkerContextEventListener::handleEvent(Event* event, bool isWindowEvent)
{
    // Is the EventListener disconnected from the frame?
    if (disconnected())
        return;

    // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
    // See issue 889829.
    RefPtr<V8AbstractEventListener> protect(this);

    v8::Locker locker;
    v8::HandleScope handleScope;

    v8::Handle<v8::Context> context = m_proxy->GetContext();
    if (context.IsEmpty())
        return;

    // Enter the V8 context in which to perform the event handling.
    v8::Context::Scope scope(context);

    // Get the V8 wrapper for the event object.
    v8::Handle<v8::Value> jsEvent = WorkerContextExecutionProxy::EventToV8Object(event);

    invokeEventHandler(context, event, jsEvent, isWindowEvent);
}

v8::Local<v8::Value> V8WorkerContextEventListener::callListenerFunction(v8::Handle<v8::Value> jsEvent, Event* event, bool isWindowEvent)
{
    v8::Local<v8::Function> handlerFunction = getListenerFunction();
    if (handlerFunction.IsEmpty())
        return v8::Local<v8::Value>();

    v8::Local<v8::Object> receiver = getReceiverObject(event, isWindowEvent);
    v8::Handle<v8::Value> parameters[1] = { jsEvent };
    v8::Local<v8::Value> result = handlerFunction->Call(receiver, 1, parameters);

    m_proxy->trackEvent(event);

    return result;
}

v8::Local<v8::Object> V8WorkerContextEventListener::getReceiverObject(Event* event, bool isWindowEvent)
{
    if (!m_listener.IsEmpty() && !m_listener->IsFunction())
        return v8::Local<v8::Object>::New(m_listener);

    if (isWindowEvent)
        return v8::Context::GetCurrent()->Global();

    EventTarget* target = event->currentTarget();
    v8::Handle<v8::Value> value = WorkerContextExecutionProxy::EventTargetToV8Object(target);
    if (value.IsEmpty())
        return v8::Local<v8::Object>();
    return v8::Local<v8::Object>::New(v8::Handle<v8::Object>::Cast(value));
}

} // namespace WebCore

#endif // WORKERS