/**
 * This file is part of CERMINE project.
 * Copyright (c) 2011-2018 ICM-UW
 *
 * CERMINE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CERMINE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with CERMINE. If not, see <http://www.gnu.org/licenses/>.
 */

package pl.edu.icm.cermine.evaluation.transformers;

import java.util.List;
import org.jdom.Element;
import org.jdom.JDOMException;
import pl.edu.icm.cermine.content.model.ContentStructure;
import pl.edu.icm.cermine.content.model.DocumentSection;
import pl.edu.icm.cermine.exception.TransformationException;
import pl.edu.icm.cermine.tools.XMLTools;
import pl.edu.icm.cermine.tools.transformers.ModelToModelConverter;

/**
 * @author Dominika Tkaczyk (d.tkaczyk@icm.edu.pl)
 */
public class PdfxToContentConverter implements ModelToModelConverter<Element, ContentStructure> {

    @Override
    public ContentStructure convert(Element source, Object... hints) throws TransformationException {
        try {
            ContentStructure struct = new ContentStructure();
            if (source == null) {
                return struct;
            }
            
            for (Object secElem : source.getChildren("section")) {
                DocumentSection section = convertSection((Element)secElem, 1);
                if (section != null) {
                    struct.addSection(section);
                }
            }            
            return struct;
        } catch (JDOMException ex) {
            throw new TransformationException(ex);
        }
    }

    @Override
    public List<ContentStructure> convertAll(List<Element> source, Object... hints) throws TransformationException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    private DocumentSection convertSection(Element source, int level) throws JDOMException {
        DocumentSection section = new DocumentSection();
        section.setLevel(level);
        
        Element title = (Element) source.getChild("h"+level);
        if (title == null) {
            return null;
        }
        section.setTitle(XMLTools.getTextContent(title));
        
        for (Object secElem : source.getChildren("section")) {
            DocumentSection subsection = convertSection((Element)secElem, level+1);
            if (subsection != null) {
                section.addSection(subsection);
            }
        }
        
        return section;
    }

}
