/**

 * 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();

	}

}