/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
package at.gv.egiz.pdfas.lib.impl.placeholder;

import java.io.IOException;

import at.gv.egiz.pdfas.common.exceptions.PDFASError;
import at.gv.egiz.pdfas.common.exceptions.PdfAsErrorCarrier;
import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
import at.gv.egiz.pdfas.common.settings.ISettings;
import at.gv.egiz.pdfas.lib.api.IConfigurationConstants;
import at.gv.egiz.pdfas.lib.impl.status.OperationStatus;

public class PlaceholderFilter implements IConfigurationConstants,
		PlaceholderExtractorConstants {

	public static SignaturePlaceholderData checkPlaceholderSignature(
			OperationStatus status, ISettings settings) throws PdfAsException,
			IOException {

		if (status.getPlaceholderConfiguration().isGlobalPlaceholderEnabled()) {
			PlaceholderExtractor extractor = status.getBackend()
					.getPlaceholderExtractor();
			String placeholderID = settings.getValue(PLACEHOLDER_ID);
			String placeholderModeString = settings.getValue(PLACEHOLDER_MODE);
			int placeholderMode = PLACEHOLDER_MATCH_MODE_MODERATE;
			if (placeholderModeString != null) {
				try {
					placeholderMode = Integer.parseInt(placeholderModeString);

					if (placeholderMode < PLACEHOLDER_MODE_MIN
							|| placeholderMode > PLACEHOLDER_MODE_MAX) {
						throw new PdfAsErrorCarrier(new PDFASError(
								PDFASError.ERROR_INVALID_PLACEHOLDER_MODE));
					}
				} catch (NumberFormatException e) {
					throw new PdfAsErrorCarrier(new PDFASError(
							PDFASError.ERROR_INVALID_PLACEHOLDER_MODE, e));
				}
			}
			SignaturePlaceholderData signaturePlaceholderData = extractor
					.extract(status.getPdfObject(), placeholderID, placeholderMode);

			return signaturePlaceholderData;
		} else
			//filter for local placeholder in selected profiles
			if (status.getPlaceholderConfiguration().isProfileConfigurationEnabled(status.getRequestedSignature().getSignatureProfileID())) {
				PlaceholderExtractor extractor = status.getBackend()
						.getPlaceholderExtractor();
				String placeholderID = settings.getValue(PLACEHOLDER_ID);
				String placeholderModeString = settings.getValue(PLACEHOLDER_MODE);
				int placeholderMode = PLACEHOLDER_MATCH_MODE_MODERATE;
				if (placeholderModeString != null) {
					try {
						placeholderMode = Integer.parseInt(placeholderModeString);

						if (placeholderMode < PLACEHOLDER_MODE_MIN
								|| placeholderMode > PLACEHOLDER_MODE_MAX) {
							throw new PdfAsErrorCarrier(new PDFASError(
									PDFASError.ERROR_INVALID_PLACEHOLDER_MODE));
						}
					} catch (NumberFormatException e) {
						throw new PdfAsErrorCarrier(new PDFASError(
								PDFASError.ERROR_INVALID_PLACEHOLDER_MODE, e));
					}
				}
				SignaturePlaceholderData signaturePlaceholderData = extractor
						.extract(status.getPdfObject(), placeholderID, placeholderMode);

				return signaturePlaceholderData;



			}
		return null;
	}}