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/**
 * Copyright 2014 OpenSearchServer Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.opensearchserver.textextractor.parser;

import java.io.File;
import java.io.InputStream;

import org.odftoolkit.odfdom.pkg.OdfElement;
import org.odftoolkit.simple.Document;
import org.odftoolkit.simple.common.TextExtractor;
import org.odftoolkit.simple.meta.Meta;

import com.opensearchserver.textextractor.ParserAbstract;
import com.opensearchserver.textextractor.ParserDocument;
import com.opensearchserver.textextractor.ParserField;

public class Odf extends ParserAbstract {

	final protected static ParserField TITLE = ParserField.newString("title",
			"The title of the document");

	final protected static ParserField CREATOR = ParserField.newString(
			"creator", "The name of the creator");

	final protected static ParserField CREATION_DATE = ParserField.newDate(
			"creation_date", "The date of creation");

	final protected static ParserField MODIFICATION_DATE = ParserField.newDate(
			"modification_date", "The date of last modification");

	final protected static ParserField DESCRIPTION = ParserField.newString(
			"description", null);

	final protected static ParserField KEYWORDS = ParserField.newString(
			"keywords", null);

	final protected static ParserField SUBJECT = ParserField.newString(
			"subject", "The subject of the document");

	final protected static ParserField CONTENT = ParserField.newString(
			"content", "The content of the document");

	final protected static ParserField LANGUAGE = ParserField.newString(
			"language", null);

	final protected static ParserField PRODUCER = ParserField.newString(
			"producer", "The producer of the document");

	final protected static ParserField LANG_DETECTION = ParserField.newString(
			"lang_detection", "Detection of the language");

	final protected static ParserField[] FIELDS = { TITLE, CREATOR,
			CREATION_DATE, MODIFICATION_DATE, DESCRIPTION, KEYWORDS, SUBJECT,
			CONTENT, LANGUAGE, PRODUCER, LANG_DETECTION };

	public Odf() {
	}

	@Override
	protected ParserField[] getParameters() {
		return null;
	}

	@Override
	protected ParserField[] getFields() {
		return FIELDS;
	}

	private void parseContent(Document document) throws Exception {
		// Load file
		try {
			if (document == null)
				return;
			Meta meta = document.getOfficeMetadata();
			if (meta != null) {
				metas.add(CREATION_DATE, meta.getCreationDate());
				metas.add(MODIFICATION_DATE, meta.getDcdate());
				metas.add(TITLE, meta.getTitle());
				metas.add(SUBJECT, meta.getSubject());
				metas.add(CREATOR, meta.getCreator());
				metas.add(PRODUCER, meta.getGenerator());
				metas.add(KEYWORDS, meta.getKeywords());
				metas.add(LANGUAGE, meta.getLanguage());
			}

			OdfElement odfElement = document.getContentRoot();
			if (odfElement != null) {
				ParserDocument result = getNewParserDocument();
				String text = TextExtractor.newOdfTextExtractor(odfElement)
						.getText();
				if (text != null) {
					result.add(CONTENT, text);
					result.add(LANG_DETECTION,
							languageDetection(CONTENT, 10000));
				}
			}
		} finally {
			if (document != null)
				document.close();
		}
	}

	@Override
	protected void parseContent(InputStream inputStream) throws Exception {
		parseContent(Document.loadDocument(inputStream));
	}

	@Override
	protected void parseContent(File file) throws Exception {
		parseContent(Document.loadDocument(file));
	}
}