/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2010 Luis Goncalves.
 *
 * XAdES4j is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or any later version.
 *
 * XAdES4j 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with XAdES4j. If not, see <http://www.gnu.org/licenses/>.
 */
package xades4j.xml.unmarshalling;

import java.util.List;
import org.apache.xml.security.c14n.Canonicalizer;
import org.w3c.dom.Element;
import xades4j.algorithms.Algorithm;
import xades4j.algorithms.GenericAlgorithm;
import xades4j.properties.data.BaseXAdESTimeStampData;
import xades4j.utils.CollectionUtils;
import xades4j.xml.bind.xades.XmlEncapsulatedPKIDataType;
import xades4j.xml.bind.xades.XmlXAdESTimeStampType;
import xades4j.xml.bind.xmldsig.XmlCanonicalizationMethodType;

/**
 *
 * @author Luís
 */
abstract class FromXmlBaseTimeStampConverter<TPropData extends BaseXAdESTimeStampData>
{
    private final String propName;

    protected FromXmlBaseTimeStampConverter(String propName)
    {
        this.propName = propName;
    }

    protected void convertTimeStamps(
            List<XmlXAdESTimeStampType> xmlTimeStamps,
            QualifyingPropertiesDataCollector propertyDataCollector) throws PropertyUnmarshalException
    {
        if (null == xmlTimeStamps || xmlTimeStamps.isEmpty())
            return;

        for (XmlXAdESTimeStampType xmlTS : xmlTimeStamps)
        {
            if(!xmlTS.getReferenceInfo().isEmpty())
                throw new PropertyUnmarshalException("ReferenceInfo is not supported in XAdESTimeStamp", propName);

            Algorithm c14n;
            XmlCanonicalizationMethodType xmlCanonMethod = xmlTS.getCanonicalizationMethod();
            if(null == xmlCanonMethod)
            {
                c14n = new GenericAlgorithm(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS);
            }
            else
            {
                List params = CollectionUtils.filterByType(xmlCanonMethod.getContent(), Element.class);
                c14n = new GenericAlgorithm(xmlCanonMethod.getAlgorithm(), params);
            }
            TPropData tsData = createTSData(c14n);

            List<Object> tsTokens = xmlTS.getEncapsulatedTimeStampOrXMLTimeStamp();
            if (tsTokens.isEmpty())
                throw new PropertyUnmarshalException("No time-stamp tokens", propName);

            for (Object tkn : tsTokens)
            {
                if (!(tkn instanceof XmlEncapsulatedPKIDataType))
                    throw new PropertyUnmarshalException("XML time-stamps are not supported", propName);
                tsData.addTimeStampToken(((XmlEncapsulatedPKIDataType)tkn).getValue());
            }

            doSpecificConvert(xmlTS, tsData);
            setTSData(tsData, propertyDataCollector);
        }
    }

    protected abstract TPropData createTSData(Algorithm c14n);

    /**
     * Override if needed.
     */
    protected void doSpecificConvert(
            XmlXAdESTimeStampType xmlTS,
            TPropData tsData) throws PropertyUnmarshalException
    {
        if(!xmlTS.getInclude().isEmpty())
            throw new PropertyUnmarshalException("Includes should not be present", "");
    }

    protected abstract void setTSData(
            TPropData tsData,
            QualifyingPropertiesDataCollector propertyDataCollector);
}