/*
 * Copyright (C) 2012 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.
 */

#ifndef DOMPatchSupport_h
#define DOMPatchSupport_h

#include "ExceptionCode.h"

#include <wtf/HashMap.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

class ContainerNode;
class DOMEditor;
class Document;
class Node;

class DOMPatchSupport final {
    WTF_MAKE_NONCOPYABLE(DOMPatchSupport);
public:
    static void patchDocument(Document*, const String& markup);

    DOMPatchSupport(DOMEditor*, Document*);
    ~DOMPatchSupport();

    void patchDocument(const String& markup);
    Node* patchNode(Node&, const String& markup, ExceptionCode&);

private:
    struct Digest;
    typedef Vector<std::pair<Digest*, size_t>> ResultMap;
    typedef HashMap<String, Digest*> UnusedNodesMap;

    bool innerPatchNode(Digest* oldNode, Digest* newNode, ExceptionCode&);
    std::pair<ResultMap, ResultMap> diff(const Vector<std::unique_ptr<Digest>>& oldChildren, const Vector<std::unique_ptr<Digest>>& newChildren);
    bool innerPatchChildren(ContainerNode*, const Vector<std::unique_ptr<Digest>>& oldChildren, const Vector<std::unique_ptr<Digest>>& newChildren, ExceptionCode&);
    std::unique_ptr<Digest> createDigest(Node*, UnusedNodesMap*);
    bool insertBeforeAndMarkAsUsed(ContainerNode*, Digest*, Node* anchor, ExceptionCode&);
    bool removeChildAndMoveToNew(Digest*, ExceptionCode&);
    void markNodeAsUsed(Digest*);
#ifdef DEBUG_DOM_PATCH_SUPPORT
    void dumpMap(const ResultMap&, const String& name);
#endif

    DOMEditor* m_domEditor;
    Document* m_document;

    UnusedNodesMap m_unusedNodesMap;
};

} // namespace WebCore

#endif // !defined(DOMPatchSupport_h)