package at.gv.egovernment.moa.spss.server.webservice.binding;

import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import at.gv.egovernment.moa.spss.MOAApplicationException;
import at.gv.egovernment.moa.spss.api.SPSSFactory;
import at.gv.egovernment.moa.spss.api.cmssign.CMSSignatureResponse;
import at.gv.egovernment.moa.spss.api.cmssign.DataObjectInfo;
import at.gv.egovernment.moa.spss.api.cmssign.SingleSignatureInfo;
import at.gv.egovernment.moa.spss.api.cmsverify.CMSDataObject;
import at.gv.egovernment.moa.spss.api.xmlsign.ErrorResponse;
import at.gv.egovernment.moaspss.util.Base64Utils;

public class CMSParserUtils {

	private TransformerUtils transformerUtils = new TransformerUtils();

	/** The factory to create API objects. */
	private SPSSFactory factory;

	public CMSParserUtils() {
		this.factory = SPSSFactory.getInstance();
	}

	/**
	 * Add a <code>CMSSignature</code> element to the response.
	 * 
	 * @param cmsSignatureResponse
	 *            The content to put under the <code>CMSSignature</code>
	 *            element.
	 * @throws IOException
	 */
	public byte[] addCMSSignature(CMSSignatureResponse cmsSignatureResponse) throws MOAApplicationException {
		String base64Value = cmsSignatureResponse.getCMSSignature();

		try {
			return Base64Utils.decode(base64Value, true);
		} catch (IOException e) {
			throw new MOAApplicationException("Base64 decoding failed", null);
		}
	}

	/**
	 * Add a <code>ErrorResponse</code> element to the response.
	 * 
	 * @param errorResponse
	 *            The API object containing the information to put into the
	 *            <code>ErrorResponse</code> DOM element.
	 */
	public at.gv.egiz.moasig.ErrorResponseType addErrorResponse(ErrorResponse errorResponse) {
		at.gv.egiz.moasig.ErrorResponseType errorResponseType = new at.gv.egiz.moasig.ErrorResponseType();

		errorResponseType.setErrorCode(BigInteger.valueOf(errorResponse.getErrorCode()));
		errorResponseType.setInfo(errorResponse.getInfo());

		return errorResponseType;
	}
	
	/**
	 * Parse all <code>SingleSignatureInfo</code> elements of the
	 * <code>CreateCMSSignatureRequest</code>.
	 * 
	 * @param requestElem
	 *            The <code>CreateCMSSignatureRequest</code> to parse.
	 * @return A <code>List</code> of <code>SingleSignatureInfo</code> API
	 *         objects.
	 * @throws MOAApplicationException
	 *             An error occurred parsing on of the
	 *             <code>SingleSignatureInfo</code> elements.
	 */
	public List parseSingleSignatureInfos(
			List<at.gv.egiz.moasig.CreateCMSSignatureRequestType.SingleSignatureInfo> singleInfos)
					throws MOAApplicationException {

		List singleSignatureInfos = new ArrayList();

		Iterator<at.gv.egiz.moasig.CreateCMSSignatureRequestType.SingleSignatureInfo> singleInfoIterator = singleInfos
				.iterator();

		while (singleInfoIterator.hasNext()) {
			at.gv.egiz.moasig.CreateCMSSignatureRequestType.SingleSignatureInfo singleSignatureInfo = singleInfoIterator
					.next();

			singleSignatureInfos.add(parseSingleSignatureInfo(singleSignatureInfo));
		}

		return singleSignatureInfos;
	}

	/**
	 * Parse a <code>SingleSignatureInfo</code> DOM element.
	 * 
	 * @param sigInfoElem
	 *            The <code>SingleSignatureInfo</code> DOM element to parse.
	 * @return A <code>SingleSignatureInfo</code> API object containing the
	 *         information of <code>sigInfoElem</code>.
	 * @throws MOAApplicationException
	 *             An error occurred parsing the
	 *             <code>SingleSignatureInfo</code>.
	 */
	public SingleSignatureInfo parseSingleSignatureInfo(
			at.gv.egiz.moasig.CreateCMSSignatureRequestType.SingleSignatureInfo singleSignatureInfo)
					throws MOAApplicationException {

		DataObjectInfo dataObjectInfo = parseDataObjectInfo(singleSignatureInfo.getDataObjectInfo());
		boolean securityLayerConform = singleSignatureInfo.isSecurityLayerConformity();

		return factory.createSingleSignatureInfoCMS(dataObjectInfo, securityLayerConform);
	}

	/**
	 * Parse the <code>DataObjectInfo</code> DOM elements contained in the given
	 * <code>SingleSignatureInfo</code> DOM element.
	 * 
	 * @param sigInfoElem
	 *            The <code>SingleSignatureInfo</code> DOM element whose
	 *            <code>DataObjectInfo</code>s to parse.
	 * @return A <code>List</code> of <code>DataObjectInfo</code> API objects
	 *         containing the data from the <code>DataObjectInfo</code> DOM
	 *         elements.
	 * @throws MOAApplicationException
	 *             An error occurred parsing one of the
	 *             <code>DataObjectInfo</code>s.
	 */
	public DataObjectInfo parseDataObjectInfo(
			at.gv.egiz.moasig.CreateCMSSignatureRequestType.SingleSignatureInfo.DataObjectInfo dataObjectInfo)
					throws MOAApplicationException {

		String structure = dataObjectInfo.getStructure();

		CMSDataObject dataObject = this.transformerUtils.parseDataObject(dataObjectInfo.getDataObject());

		return factory.createDataObjectInfo(structure, dataObject);

	}

}