/**
 * 
 * Copyright 2010 Paul Scherrer Institute. All rights reserved.
 * 
 * This code 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 3 of the License, or
 * (at your option) any later version.
 * 
 * This code 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 code. If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package ch.psi.cdump;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author ebner
 *
 */
public class CdumpConfiguration {
	
	private static final CdumpConfiguration instance = new CdumpConfiguration();
	
	private String dataChannel;
	private int nelements = 65536;
	private String controlChannel;
	private String samplingRateChannel;
	private String filePrefix = "${yyyy_MM}/${yyyyMMdd}/${yyyyMMddHHmmss}_${name}/${yyyyMMddHHmm}_";
	private String dataDirectory;

	/**
	 * Singleton - Private constructor
	 */
	private CdumpConfiguration(){
		loadConfiguration();
	}
	
	public static CdumpConfiguration getInstance(){
		return instance;
	}

	private void loadConfiguration() {
		String config = System.getProperty(CdumpService.APP_HOME);
		
		if(config == null){
			throw new RuntimeException("No configuration file specified via -D"+CdumpService.APP_HOME+"=...");
		}
		
		Properties properties = new Properties();
		try {
			properties.load(new FileReader(config+"/config/cdump.properties"));
		} catch (FileNotFoundException e) {
			throw new RuntimeException("Configuration file "+config+" not found", e);
		} catch (IOException e) {
			throw new RuntimeException("Cannot read configuration file "+config, e);
		}
		
		dataChannel = properties.getProperty(CdumpConfiguration.class.getPackage().getName()+".dataChannel", "");
		controlChannel = properties.getProperty(CdumpConfiguration.class.getPackage().getName()+".controlChannel", "");
		samplingRateChannel = properties.getProperty(CdumpConfiguration.class.getPackage().getName()+".samplingRateChannel", "");
		dataDirectory = config+"/data";
		
	}
	
	/**
	 * @return the dataChannel
	 */
	public String getDataChannel() {
		return dataChannel;
	}
	/**
	 * @param dataChannel the dataChannel to set
	 */
	public void setDataChannel(String dataChannel) {
		this.dataChannel = dataChannel;
	}
	/**
	 * @return the controlChannel
	 */
	public String getControlChannel() {
		return controlChannel;
	}
	/**
	 * @param controlChannel the controlChannel to set
	 */
	public void setControlChannel(String controlChannel) {
		this.controlChannel = controlChannel;
	}
	/**
	 * @return the samplingRateChannel
	 */
	public String getSamplingRateChannel() {
		return samplingRateChannel;
	}
	/**
	 * @param samplingRateChannel the samplingRateChannel to set
	 */
	public void setSamplingRateChannel(String samplingRateChannel) {
		this.samplingRateChannel = samplingRateChannel;
	}

	/**
	 * @return the nelements
	 */
	public int getNelements() {
		return nelements;
	}
	
	/**
	 * @return the filePrefix
	 */
	public String getFilePrefix() {
		return filePrefix;
	}
	
	/**
	 * @return the dataDirectory
	 */
	public String getDataDirectory() {
		return dataDirectory;
	}

	public String replaceMacros(String string, Date date, String name){
		String newString = string;
		
		// Replace scan name macros
		newString = newString.replaceAll("\\$\\{name\\}", name);
		
		
		// Replace date macros
		Pattern pattern = Pattern.compile("\\$\\{[a-z,A-Z,-,_,:]*\\}");
        Matcher matcher = pattern.matcher(newString);
        while(matcher.find()){
        	String datePattern = matcher.group();
        	datePattern = datePattern.replaceAll("\\$\\{", "");
        	datePattern = datePattern.replaceAll("\\}", "");
        	SimpleDateFormat datef = new SimpleDateFormat(datePattern);
        	newString = matcher.replaceFirst(datef.format(date));
        	matcher = pattern.matcher(newString);
        }
		return newString;
	}
}