/* FeatureIDE - An IDE to support feature-oriented software development
 * Copyright (C) 2005-2009  FeatureIDE Team, University of Magdeburg
 *
 * 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 2 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/.
 *
 * See http://www.fosd.de/featureide/ for further information.
 */
package featureide.fm.core.configuration;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;

public class ConfigurationReader {
	
	private Configuration configuration;
	
	private LinkedList<String> warnings = new LinkedList<String>();

	public ConfigurationReader(Configuration configuration) {
		this.configuration = configuration;
	}
	
	public boolean readFromFile(IFile file) throws CoreException, IOException {
		String fileName = file.getRawLocation().toOSString();		
        InputStream inputStream = new FileInputStream(fileName);
        return readFromInputStream(inputStream);
 	}

	public boolean readFromString(String text) {
        InputStream inputStream = new ByteArrayInputStream(text.getBytes());
        try {
			return readFromInputStream(inputStream);
		} catch (IOException e) {
		}
		return false;
 	}
	
	private boolean readFromInputStream(InputStream inputStream) throws IOException {
		configuration.resetValues();
		
		BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
		String line = null;
		boolean successful = true;
		//TODO #30: add line numbers to warnings in configuration files
		while ((line = reader.readLine()) != null) {
			if (line.startsWith("#"))
				continue;
			String name = line.trim();
			try {
				configuration.setManual(name, Selection.SELECTED);
			} catch (FeatureNotFoundException e) {
				successful = false;
				warnings.add("Feature " + name + " does not exist anymore");
			} catch (SelectionNotPossibleException e) {
				successful = false;
				warnings.add("Feature " + name + " cannot be selected anymore");
			}
		}
		reader.close();
		
		return successful;
	}

	public List<String> getWarnings() {
		return Collections.unmodifiableList(warnings);
	}

}