/*
 * Copyright (C) 2010 Apple 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:
 * 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. ``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
 * 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 "AccessibilityMenuListPopup.h"

#include "AXObjectCache.h"
#include "AccessibilityMenuList.h"
#include "AccessibilityMenuListOption.h"
#include "HTMLNames.h"
#include "HTMLOptionElement.h"
#include "HTMLSelectElement.h"
#include "RenderMenuList.h"

namespace WebCore {

using namespace HTMLNames;

AccessibilityMenuListPopup::AccessibilityMenuListPopup()
{
}

bool AccessibilityMenuListPopup::isVisible() const
{
    return false;
}

bool AccessibilityMenuListPopup::isOffScreen() const
{
    if (!m_parent)
        return true;
    
    return m_parent->isCollapsed();
}

bool AccessibilityMenuListPopup::isEnabled() const
{
    if (!m_parent)
        return false;
    
    return m_parent->isEnabled();
}

bool AccessibilityMenuListPopup::computeAccessibilityIsIgnored() const
{
    return accessibilityIsIgnoredByDefault();
}

bool AccessibilityMenuListPopup::canHaveSelectedChildren() const
{
#if USE(ATSPI)
    return true;
#else
    return false;
#endif
}

void AccessibilityMenuListPopup::selectedChildren(AccessibilityChildrenVector& result)
{
    ASSERT(result.isEmpty());
    if (!canHaveSelectedChildren())
        return;

    if (!childrenInitialized())
        addChildren();

    for (const auto& child : m_children) {
        if (child->isMenuListOption() && child->isSelected())
            result.append(child.get());
    }
}

AccessibilityMenuListOption* AccessibilityMenuListPopup::menuListOptionAccessibilityObject(HTMLElement* element) const
{
    if (!element || !element->inRenderedDocument())
        return nullptr;

    return downcast<AccessibilityMenuListOption>(document()->axObjectCache()->getOrCreate(element));
}

bool AccessibilityMenuListPopup::press()
{
    if (!m_parent)
        return false;
    
    m_parent->press();
    return true;
}

void AccessibilityMenuListPopup::addChildren()
{
    if (!m_parent)
        return;
    
    Node* selectNode = m_parent->node();
    if (!selectNode)
        return;

    m_childrenInitialized = true;

    for (const auto& listItem : downcast<HTMLSelectElement>(*selectNode).listItems()) {
        if (auto* menuListOptionObject = menuListOptionAccessibilityObject(listItem)) {
            menuListOptionObject->setParent(this);
            addChild(menuListOptionObject, DescendIfIgnored::No);
        }
    }
}

void AccessibilityMenuListPopup::handleChildrenChanged()
{
    AXObjectCache* cache = axObjectCache();
    for (size_t i = m_children.size(); i > 0 ; --i) {
        AXCoreObject* child = m_children[i - 1].get();
        if (child->actionElement() && !child->actionElement()->inRenderedDocument()) {
            child->detachFromParent();
            cache->remove(child->objectID());
        }
    }

    m_children.clear();
    m_childrenInitialized = false;
    addChildren();
}

void AccessibilityMenuListPopup::didUpdateActiveOption(int optionIndex)
{
    ASSERT_ARG(optionIndex, optionIndex >= 0);
    ASSERT_ARG(optionIndex, optionIndex < static_cast<int>(m_children.size()));

    RefPtr<AXCoreObject> child = m_children[optionIndex].get();

    if (auto* cache = axObjectCache()) {
        cache->postNotification(child.get(), document(), AXObjectCache::AXFocusedUIElementChanged);
        cache->postNotification(child.get(), document(), AXObjectCache::AXMenuListItemSelected);
    }
}

} // namespace WebCore