/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.tools.parameter;

import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
import java.util.Map.Entry;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.rapidminer.tools.FileSystemService;
import com.rapidminer.tools.Tools;

/**
 * A writer that will export the defined parameters that are preStart Parameters
 * to a config file in the user directory that is used by the exe start program
 * to set Environment Variables before actual JVM starts.
 * 
 * The format is line separated as follows:
 * - mode: Mode is either "append" or "overwrite". On Append the new value is appended ; separeted
 * - name: Name of the environment variable to set
 * - value: The value of the variable
 * 
 * @author Sebastian Land
 */
public class WindowsExeParameterWriter implements ParameterWriter {

    public static final String CONFIG_FILE_NAME = "config.win";

    private static final Logger LOGGER = Logger.getLogger(WindowsExeParameterWriter.class.getSimpleName());

    @Override
    public void writeParameters(Map<String, Parameter> parameters) {
        File configFile = new File(FileSystemService.getUserRapidMinerDir(), CONFIG_FILE_NAME);
        try {
            BufferedWriter writer = new BufferedWriter(new PrintWriter(configFile));

            for (Entry<String, Parameter> entry : parameters.entrySet()) {
                Parameter parameter = entry.getValue();
                if (parameter.getValue() != null) {
                    if (parameter.isDefined() && parameter.getScope().isPreStartParameter()) {
                        if (parameter.getScope().isModifyingPreStartParameter()) {
                            writer.append("append" + Tools.getLineSeparator());
                        } else {
                            writer.append("overwrite" + Tools.getLineSeparator());
                        }
                    }
                    writer.append(parameter.getScope().getPreStartName());
                    writer.append(parameter.getValue());
                }
            }
        } catch (IOException e) {
            LOGGER.log(Level.WARNING, "Could not write config file. Reason: ", e);
        }
    }
}