/*
 * Copyright 2010, The Android Open Source Project
 * Copyright (C) 2012 Samsung Electronics. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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"
#include "core/page/DeviceController.h"

#include "core/dom/Document.h"
#include "core/page/DeviceClient.h"

namespace WebCore {

// FIXME: Another alternative is to update copyToVector in HashCountedSet to allow the source
// and destination types to differ it the source type is convertible to the destination type.
Vector<RefPtr<DOMWindow> > copyKeysToReferencingVector(const HashCountedSet<DOMWindow*>& set)
{
    Vector<RefPtr<DOMWindow> > vector;
    vector.reserveCapacity(set.size());

    HashCountedSet<DOMWindow*>::const_iterator end= set.end();
    for (HashCountedSet<DOMWindow*>::const_iterator it = set.begin(); it != end; ++it)
        vector.append((*it).key);
    return vector;
}

DeviceController::DeviceController(DeviceClient* client)
    : m_client(client)
    , m_timer(this, &DeviceController::fireDeviceEvent)
{
    ASSERT(m_client);
}

void DeviceController::addDeviceEventListener(DOMWindow* window)
{
    bool wasEmpty = m_listeners.isEmpty();
    m_listeners.add(window);

    if (hasLastData()) {
        m_lastEventListeners.add(window);
        if (!m_timer.isActive())
            m_timer.startOneShot(0);
    }

    if (wasEmpty)
        m_client->startUpdating();
}

void DeviceController::removeDeviceEventListener(DOMWindow* window)
{
    m_listeners.remove(window);
    m_lastEventListeners.remove(window);
    if (m_listeners.isEmpty())
        m_client->stopUpdating();
}

void DeviceController::removeAllDeviceEventListeners(DOMWindow* window)
{
    m_listeners.removeAll(window);
    m_lastEventListeners.removeAll(window);
    if (m_listeners.isEmpty())
        m_client->stopUpdating();
}

void DeviceController::dispatchDeviceEvent(PassRefPtr<Event> prpEvent)
{
    RefPtr<Event> event = prpEvent;
    Vector<RefPtr<DOMWindow> > listenerVector = copyKeysToReferencingVector(m_listeners);
    for (size_t i = 0; i < listenerVector.size(); ++i) {
        if (listenerVector[i]->document()
            && !listenerVector[i]->document()->activeDOMObjectsAreSuspended()
            && !listenerVector[i]->document()->activeDOMObjectsAreStopped())
        listenerVector[i]->dispatchEvent(event);
    }
}

void DeviceController::fireDeviceEvent(Timer<DeviceController>* timer)
{
    ASSERT_UNUSED(timer, timer == &m_timer);
    ASSERT(hasLastData());

    m_timer.stop();
    Vector<RefPtr<DOMWindow> > listenerVector = copyKeysToReferencingVector(m_lastEventListeners);
    m_lastEventListeners.clear();
    for (size_t i = 0; i < listenerVector.size(); ++i) {
        if (listenerVector[i]->document()
            && !listenerVector[i]->document()->activeDOMObjectsAreSuspended()
            && !listenerVector[i]->document()->activeDOMObjectsAreStopped())
        listenerVector[i]->dispatchEvent(getLastEvent());
    }
}

} // namespace WebCore