/**

  * Alt2XML

  * Copyright © 2014 František Kučera (frantovo.cz)

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License, or

  * (at your option) any later version.

  *

  * This program 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 General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. If not, see <http://www.gnu.org/licenses/>.

  */

 package cz.frantovo.alt2xml.in.properties;

 import cz.frantovo.alt2xml.AbstractAlt2XmlReader;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStreamReader;

 import java.io.StringReader;

 import java.nio.charset.StandardCharsets;

 import java.util.Map.Entry;

 import java.util.Properties;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import org.xml.sax.InputSource;

 import org.xml.sax.SAXException;

 import org.xml.sax.helpers.AttributesImpl;

 /**

  *

  * @author Ing. František Kučera (frantovo.cz)

  */

 public class Reader extends AbstractAlt2XmlReader {

 	public static final String PROPERTY_BATCH_MODE = constructPropertyName("properties", "batch-mode");

 	private static final Logger log = Logger.getLogger(Reader.class.getName());

 	/**

 	 * <p>

 	 * TODO: same format as Java XML properties

 	 * </p>

 	 * <p>

 	 * TODO: support also nested mode <code>aaa.bbb.ccc=xxx</code> →

 	 * <code>&lt;aaa&gt;&lt;bbb&gt;&lt;ccc&gt;xxx&lt;/ccc&gt;&lt;/bbb&gt;&lt;/aaa&gt;</code></p>

 	 */

 	@Override

 	public void parse(InputSource input) throws IOException, SAXException {

 		if (isInBatchMode()) {

 			log.log(Level.FINE, "Reading in batch mode");

 			parseAsBatch(input);

 		} else {

 			log.log(Level.FINE, "Reading in streaming mode");

 			parseAsStream(input);

 		}

 	}

 	private void parseAsBatch(InputSource input) throws IOException, SAXException {

 		Properties loadedData = new Properties();

 		loadedData.load(input.getByteStream());

 		outputStart();

 		outputProperties(loadedData);

 		outputEnd();

 	}

 	private void parseAsStream(InputSource input) throws IOException, SAXException {

 		outputStart();

 		try (BufferedReader br = new BufferedReader(new InputStreamReader(input.getByteStream(), StandardCharsets.ISO_8859_1))) {

 			StringBuilder continuingLine = null;

 			Properties loadedData = new Properties();

 			for (String currentLine = br.readLine(); currentLine != null; currentLine = br.readLine()) {

 				if (currentLine.endsWith("\\")) {

 					if (continuingLine == null) {

 						continuingLine = new StringBuilder();

 					}

 					continuingLine.append(currentLine);

 				} else {

 					String wholeLogicalLine = (continuingLine == null) ? currentLine : continuingLine.append("\n").append(currentLine).toString();

 					continuingLine = null;

 					loadedData.load(new StringReader(wholeLogicalLine));

 					outputProperties(loadedData);

 					loadedData.clear();

 				}

 			}

 		}

 		outputEnd();

 	}

 	/**

 	 * Default mode is streaming.

 	 *

 	 * @return false = do streaming | true = parse whole input as one batch and when all parsed,

 	 * flush output

 	 */

 	private boolean isInBatchMode() {

 		return Boolean.parseBoolean(String.valueOf(properties.get(PROPERTY_BATCH_MODE)));

 	}

 	private void outputStart() throws SAXException {

 		contentHandler.startDocument();

 		contentHandler.startElement(null, null, "properties", null);

 		contentHandler.lineBreak();

 	}

 	private void outputProperty(String key, String value) throws SAXException {

 		contentHandler.indentation(1);

 		AttributesImpl attributes = new AttributesImpl();

 		attributes.addAttribute(null, "name", "name", "xs:string", key);

 		contentHandler.startElement(null, null, "property", attributes);

 		contentHandler.characters(value.toCharArray(), 0, value.length());

 		contentHandler.endElement(null, null, "property");

 		contentHandler.lineBreak();

 	}

 	private void outputProperties(Properties loadedData) throws SAXException {

 		for (Entry<Object, Object> e : loadedData.entrySet()) {

 			String key = (String) e.getKey();

 			String value = (String) e.getValue();

 			outputProperty(key, value);

 		}

 	}

 	private void outputEnd() throws SAXException {

 		contentHandler.endElement(null, null, "properties");

 		contentHandler.lineBreak();

 		contentHandler.endDocument();

 	}

 }