/**
 * <copyright> Copyright 2006 by Know-Center, 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.framework.logging;

import org.apache.commons.logging.Log;

import at.gv.egiz.pdfas.api.exceptions.PdfAsException;
import at.gv.egiz.pdfas.exceptions.external.ExternalErrorException;
import at.gv.egiz.pdfas.utils.CsvUtils;

/**
 * A statistic logger implementation that prodoces csv based logging entries.
 *
 * @author Datentechnik Innovation GmbH
 */
public class CsvStatisticLogger implements StatisticLogger {

	/**
	 * The underlying logging implementation.
	 */
	private Log log;

	/**
	 * A csv value indication error conditions.
	 */
	private static final String VALUE_ERROR = "ERROR";

	/**
	 * A csv value indication success conditions.
	 */
	private static final String VALUE_OK = "OK";

	/**
	 * Creates a new instance.
	 *
	 * @param log
	 *            The underlying logger.
	 */
	CsvStatisticLogger(Log log) {
		this.log = log;
	}

	public void log(StatisticData data) {
		if (isEnabled()) {
			StringBuffer msg = new StringBuffer();

			// add escapted fields
			msg.append(CsvUtils.escapeCsvValue(data.operation)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(data.signatureMode)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(data.connector)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(data.signatureProfileId)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(data.fileSize)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(data.userAgent)).append(CsvUtils.DEFAULT_DELIMITER);

			// handle error conditions
			Integer errorCode = null;
			String externalErrorCode = null;
			if (data.exception != null) {
				msg.append(VALUE_ERROR).append(CsvUtils.DEFAULT_DELIMITER);
				if (data.exception instanceof PdfAsException) {
					PdfAsException pdfAsException = (PdfAsException) data.exception;
					errorCode = pdfAsException.getErrorCode();
					if (pdfAsException instanceof ExternalErrorException) {
						externalErrorCode = ((ExternalErrorException) pdfAsException).getExternalErrorCode();
					}
				}
				msg.append(CsvUtils.escapeCsvValue(data.exception.getClass().getName())).append(CsvUtils.DEFAULT_DELIMITER);
			} else {
				msg.append(VALUE_OK).append(CsvUtils.DEFAULT_DELIMITER).append(CsvUtils.DEFAULT_DELIMITER);
			}
			msg.append(CsvUtils.escapeCsvValue(errorCode)).append(CsvUtils.DEFAULT_DELIMITER);
			msg.append(CsvUtils.escapeCsvValue(externalErrorCode)).append(CsvUtils.DEFAULT_DELIMITER);

			msg.append(CsvUtils.escapeCsvValue(data.duration));

			log.info(msg);
		}
	}

	public boolean isEnabled() {
		return log.isInfoEnabled();
	}

}