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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.apache.commons.io.IOUtils;
import org.apache.poi.POIXMLProperties.CoreProperties;
import org.apache.poi.xssf.extractor.XSSFExcelExtractor;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

public class Xlsx 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", null);

	final protected static ParserField MODIFICATION_DATE = ParserField.newDate(
			"modification_date", null);

	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 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, LANG_DETECTION };

	public Xlsx() {
	}

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

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

	private void parseContent(XSSFWorkbook workbook) throws Exception {

		XSSFExcelExtractor excelExtractor = null;
		try {
			excelExtractor = new XSSFExcelExtractor(workbook);

			CoreProperties info = excelExtractor.getCoreProperties();
			if (info != null) {
				metas.add(TITLE, info.getTitle());
				metas.add(CREATOR, info.getCreator());
				metas.add(CREATION_DATE, info.getCreated());
				metas.add(MODIFICATION_DATE, info.getModified());
				metas.add(SUBJECT, info.getSubject());
				metas.add(DESCRIPTION, info.getDescription());
				metas.add(KEYWORDS, info.getKeywords());
			}

			ParserDocument result = getNewParserDocument();
			excelExtractor.setIncludeCellComments(true);
			excelExtractor.setIncludeHeadersFooters(true);
			excelExtractor.setIncludeSheetNames(true);
			result.add(CONTENT, excelExtractor.getText());
			result.add(LANG_DETECTION, languageDetection(CONTENT, 10000));

		} finally {
			if (excelExtractor != null)
				IOUtils.closeQuietly(excelExtractor);
		}

	}

	@Override
	protected void parseContent(InputStream inputStream) throws Exception {
		parseContent(new XSSFWorkbook(inputStream));
	}

	@Override
	protected void parseContent(File file) throws Exception {
		parseContent(new XSSFWorkbook(file));
	}
}