/*
 * Copyright (C) 2005, 2006, 2008 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 COMPUTER, 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 COMPUTER, 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. 
 */

#ifndef ReplaceSelectionCommand_h
#define ReplaceSelectionCommand_h

#include "CompositeEditCommand.h"

namespace WebCore {

class DocumentFragment;
class ReplacementFragment;

class ReplaceSelectionCommand : public CompositeEditCommand {
public:
    enum CommandOption {
        SelectReplacement = 1 << 0,
        SmartReplace = 1 << 1,
        MatchStyle = 1 << 2,
        PreventNesting = 1 << 3,
        MovingParagraph = 1 << 4,
        SanitizeFragment = 1 << 5
    };

    typedef unsigned CommandOptions;

    static PassRefPtr<ReplaceSelectionCommand> create(Document* document, PassRefPtr<DocumentFragment> fragment, CommandOptions options, EditAction action = EditActionPaste)
    {
        return adoptRef(new ReplaceSelectionCommand(document, fragment, options, action));
    }

private:
    ReplaceSelectionCommand(Document*, PassRefPtr<DocumentFragment>, CommandOptions, EditAction);

    virtual void doApply();
    virtual EditAction editingAction() const;
    
    class InsertedNodes {
    public:
        void respondToNodeInsertion(Node*);
        void willRemoveNodePreservingChildren(Node*);
        void willRemoveNode(Node*);

        Node* firstNodeInserted() const { return m_firstNodeInserted.get(); }
        Node* lastLeafInserted() const { return m_lastNodeInserted->lastDescendant(); }
        Node* pastLastLeaf() const { return m_lastNodeInserted ? lastLeafInserted()->traverseNextNode() : 0; }

    private:
        RefPtr<Node> m_firstNodeInserted;
        RefPtr<Node> m_lastNodeInserted;
    };

    Node* insertAsListItems(PassRefPtr<HTMLElement> listElement, Node* insertionNode, const Position&, InsertedNodes&);

    void updateNodesInserted(Node*);
    bool shouldRemoveEndBR(Node*, const VisiblePosition&);
    
    bool shouldMergeStart(bool, bool, bool);
    bool shouldMergeEnd(bool selectionEndWasEndOfParagraph);
    bool shouldMerge(const VisiblePosition&, const VisiblePosition&);
    
    void mergeEndIfNeeded();
    
    void removeUnrenderedTextNodesAtEnds(InsertedNodes&);
    
    void removeRedundantStylesAndKeepStyleSpanInline(InsertedNodes&);
    void handleStyleSpans(InsertedNodes&);
    void handlePasteAsQuotationNode();
    
    VisiblePosition positionAtStartOfInsertedContent() const;
    VisiblePosition positionAtEndOfInsertedContent() const;

    bool shouldPerformSmartReplace() const;
    void addSpacesForSmartReplace();
    void completeHTMLReplacement(const Position& lastPositionToSelect);

    bool performTrivialReplace(const ReplacementFragment&);

    Position m_startOfInsertedContent;
    Position m_endOfInsertedContent;
    RefPtr<EditingStyle> m_insertionStyle;
    bool m_selectReplacement;
    bool m_smartReplace;
    bool m_matchStyle;
    RefPtr<DocumentFragment> m_documentFragment;
    bool m_preventNesting;
    bool m_movingParagraph;
    EditAction m_editAction;
    bool m_sanitizeFragment;
    bool m_shouldMergeEnd;
};

} // namespace WebCore

#endif // ReplaceSelectionCommand_h
