/*
 * Copyright (C) 2017 Lukas Zaruba, lukas.zaruba@gmail.com
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */
package org.xhtmlrenderer.fop.nbsp;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Lukas Zaruba, lukas.zaruba@gmail.com
 */
public class NonBreakPointsLoaderImpl implements NonBreakPointsLoader {
	
	@Override
	public List<String> loadNBSP(String lang) {
		if (lang == null || lang.isEmpty()) {
			throw new IllegalArgumentException("Lang must be filled to search for file!");
		}
		List<String> result = loadForKey(lang);
		if (result == null) {
			int index = lang.indexOf('_');
			if (index < 0) return null; // cannot split key
			result = loadForKey(lang.substring(0, index));
		}
		return result;
	}
	
	private List<String> loadForKey(String lang) {
		String path = "non-break-spaces/" + lang + ".nbsp";
		InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(path);
		if (is == null) return null;
		try {
			BufferedReader r = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
			List<String> result = new ArrayList<String>();
			String line = null;
			while ((line = r.readLine()) != null) {
				if (line.isEmpty() || line.startsWith("#")) continue;
				result.add(line);
			}
			return result;
		} catch (IOException e) {
			throw new RuntimeException("Error while loading nbsp file from path " + path, e);
		} finally {
			try {
				is.close();
			} catch (IOException e1) {
				// ignore
			}
		}
	}

}