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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.xwpf.usermodel;

import org.apache.poi.util.Internal;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTFtnEdn;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTFtnEdnRef;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTR;

Represents an end note footnote.
End notes are collected at the end of a document or section rather than
at the bottom of a page.
Create a new footnote using XWPFDocument.createEndnote() or XWPFEndnotes.createFootnote().
The first body element of a footnote should (or possibly must) be a paragraph with the first run containing a CTFtnEdnRef object. The XWPFAbstractFootnoteEndnote.createParagraph() and XWPFAbstractFootnoteEndnote.createTable() methods do this for you.
Footnotes have IDs that are unique across all footnotes in the document. You use
the footnote ID to create a reference to a footnote from within a paragraph.
To create a reference to a footnote within a paragraph you create a run with a CTFtnEdnRef that specifies the ID of the target paragraph. The XWPFParagraph.addFootnoteReference(XWPFAbstractFootnoteEndnote) method does this for you.
Since:
4.0.0/**
 * Represents an end note footnote.
 * <p>End notes are collected at the end of a document or section rather than
 * at the bottom of a page.</p>
 * <p>Create a new footnote using {@link XWPFDocument#createEndnote()} or
 * {@link XWPFEndnotes#createFootnote()}.</p>
 * <p>The first body element of a footnote should (or possibly must) be a paragraph
 * with the first run containing a CTFtnEdnRef object. The {@link XWPFFootnote#createParagraph()}
 * and {@link XWPFFootnote#createTable()} methods do this for you.</p>
 * <p>Footnotes have IDs that are unique across all footnotes in the document. You use
 * the footnote ID to create a reference to a footnote from within a paragraph.</p>
 * <p>To create a reference to a footnote within a paragraph you create a run
 * with a CTFtnEdnRef that specifies the ID of the target paragraph. 
 * The {@link XWPFParagraph#addFootnoteReference(XWPFAbstractFootnoteEndnote)}
 * method does this for you.</p>
 * @since 4.0.0
 */
public class XWPFEndnote extends XWPFAbstractFootnoteEndnote {

    public XWPFEndnote() {}

    @Internal
    public XWPFEndnote(XWPFDocument document, CTFtnEdn body) {
        super(document, body);
    }

    @Internal
    public XWPFEndnote(CTFtnEdn note, XWPFAbstractFootnotesEndnotes footnotes) {
        super(note, footnotes);
    }

    
Ensure that the specified paragraph has a reference marker for this
end note by adding a footnote reference if one is not found.
This method is for the first paragraph in the footnote, not paragraphs that will refer to the footnote. For references to the footnote, use XWPFParagraph#addFootnoteReference(XWPFAbstractFootnoteEndnote)). 
The first run of the first paragraph in a footnote should contain a CTFtnEdnRef object.
Params:
p – The XWPFParagraph to ensure
Since:
4.0.0/**
     * Ensure that the specified paragraph has a reference marker for this
     * end note by adding a footnote reference if one is not found.
     * <p>This method is for the first paragraph in the footnote, not 
     * paragraphs that will refer to the footnote. For references to
     * the footnote, use {@link XWPFParagraph#addFootnoteReference(XWPFAbstractFootnoteEndnote))}.
     * </p>
     * <p>The first run of the first paragraph in a footnote should
     * contain a {@link CTFtnEdnRef} object.</p>
     *
     * @param p The {@link XWPFParagraph} to ensure
     * @since 4.0.0
       */
    public void ensureFootnoteRef(XWPFParagraph p) {
        
        XWPFRun r = null;
        if (p.getRuns().size() > 0) {
            r = p.getRuns().get(0);
        }
        if (r == null) {
            r = p.createRun();
        }
        CTR ctr = r.getCTR();
        boolean foundRef = false;
        for (CTFtnEdnRef ref : ctr.getEndnoteReferenceList()) {
            if (getId().equals(ref.getId())) {
                foundRef = true;
                break;
            }
        }
        if (!foundRef) {
            ctr.addNewRPr().addNewRStyle().setVal("FootnoteReference");
            ctr.addNewEndnoteRef();
        }
        
    }

}