/*
 * Copyright (C) 2024 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.
 * 3.  Neither the name of Apple Inc. ("Apple") 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 APPLE 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 OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "ContainerNode.h"
#include "Element.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include "NodeName.h"

namespace WebCore {

class AsyncNodeDeletionQueue {
public:
    ALWAYS_INLINE void addIfSubtreeSizeIsUnderLimit(NodeVector&& children, unsigned subTreeSize)
    {
        if (m_nodeCount + subTreeSize > s_maxSizeAsyncNodeDeletionQueue)
            return;
        m_nodeCount += subTreeSize;
        m_queue.appendVector(WTFMove(children));
    }

    ALWAYS_INLINE void deleteNodesNow()
    {
        m_queue.clear();
        m_nodeCount = 0;
    }

    ALWAYS_INLINE static ContainerNode::CanDelayNodeDeletion canNodeBeDeletedAsync(const Node& node)
    {
        if (!dynamicDowncast<HTMLElement>(node))
            return ContainerNode::CanDelayNodeDeletion::Yes;
        if (isNodeLikelyLarge(node))
            return ContainerNode::CanDelayNodeDeletion::No;
        return ContainerNode::CanDelayNodeDeletion::Yes;
    }

    ALWAYS_INLINE static bool isNodeLikelyLarge(const Node& node)
    {
        ASSERT(node.isElementNode());

        switch (downcast<Element>(node).elementName()) {
        case NodeName::HTML_audio:
        case NodeName::HTML_body:
        case NodeName::HTML_canvas:
        case NodeName::HTML_iframe:
        case NodeName::HTML_img:
        case NodeName::HTML_object:
        case NodeName::HTML_source:
        case NodeName::HTML_track:
        case NodeName::HTML_video:
        case NodeName::SVG_svg:
            return true;
        default:
            return false;
        }
    }

private:
    Vector<Ref<Node>> m_queue;
    unsigned m_nodeCount { 0 };
    static constexpr unsigned s_maxSizeAsyncNodeDeletionQueue = 100000;
};

} // namespace WebCore
