/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | 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, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

package de.ilias.services.settings;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.util.prefs.Preferences;

import org.apache.log4j.Logger;
import org.ini4j.Ini;
import org.ini4j.IniPreferences;

/**
 * Parser for ini files.
 * Stores ini values in ServerSettings and ClientSettings
 *
 * @author Stefan Meyer <smeyer.ilias@gmx.de>
 * @version $Id$
 */
public class IniFileParser {

	Logger logger = Logger.getLogger(IniFileParser.class);
	
	/**
	 * 
	 */
	public IniFileParser() {

	}

	/**
	 * 
	 * @param path
	 * @throws ConfigurationException
	 */
	public void parseServerSettings(String path, boolean parseClientSettings) throws ConfigurationException {
		
		Ini prefs;
		ServerSettings serverSettings = ServerSettings.getInstance();
		ClientSettings clientSettings;
		try {

			prefs = new Ini(new FileReader(path));
			for(Ini.Section section : prefs.values()) {
				
				if(section.getName().equals("Server")) {
					if(section.containsKey("IpAddress"))
						serverSettings.setHost(purgeString(section.get("IpAddress")));
					if(section.containsKey("Port"))
						serverSettings.setPort(purgeString(section.get("Port")));
					if(section.containsKey("IndexPath"))
						serverSettings.setIndexPath(purgeString(section.get("IndexPath")));
					if(section.containsKey("LogLevel"))
						serverSettings.setLogFile(purgeString(section.get("LogFile")));
					if(section.containsKey("LogLevel"))
						serverSettings.setLogLevel(purgeString(section.get("LogLevel")));
					serverSettings.initLogger();
					if(section.containsKey("NumThreads"))
						serverSettings.setThreadNumber(purgeString(section.get("NumThreads")));
					if(section.containsKey("RAMBufferSize"))
						serverSettings.setRAMSize(purgeString(section.get("RAMBufferSize")));
					if(section.containsKey("IndexMaxFileSizeMB"))
						serverSettings.setMaxFileSizeMB(purgeString(section.get("IndexMaxFileSizeMB")));
				}
				if(section.getName().startsWith("Client") && parseClientSettings) {
					if(section.containsKey("ClientId")) {
						String client = purgeString(section.get("ClientId"));
						String nic;
						if(section.containsKey("NicId")) 
							nic = purgeString(section.get("NicId"));
						else
							nic = "0"; 
						clientSettings = ClientSettings.getInstance(client, nic);
						if(section.containsKey("IliasIniPath")) {
							clientSettings.setIliasIniFile(purgeString(section.get("IliasIniPath")));
							
							// Now parse the ilias.ini file
							parseClientData(clientSettings);
						}
					}
					else {
						logger.error("No ClientId given for section: " + section.getName());
						throw new ConfigurationException("No ClientId given for section: " + section.getName());
					}
				}
			}

		} 
		catch (ConfigurationException e) {
			logger.error("Cannot parse server settings: " + e.getMessage());
			throw new ConfigurationException(e);
		} 
		catch (IOException e) {
			logger.error("Cannot parse server settings: " + e.getMessage());
			throw new ConfigurationException(e);
		}
	}
	
	/**
	 * @param clientSettings
	 * @throws ConfigurationException 
	 */
	public void parseClientData(ClientSettings clientSettings) throws ConfigurationException {

		Preferences prefs;
		try {
			// parse ilias.ini.php
			prefs = new IniPreferences(convertIniFile(clientSettings.getIliasIniFile()));
			clientSettings.setDataDirectory(purgeString(prefs.node("clients").get("datadir",""),true));
			clientSettings.setAbsolutePath(purgeString(prefs.node("server").get("absolute_path",""),true));
			
			String dataName = purgeString(prefs.node("clients").get("path", ""),true);
			String iniFileName = purgeString(prefs.node("clients").get("inifile",""),true);
			
			clientSettings.setClientIniFile(clientSettings.getAbsolutePath().getCanonicalPath() + 
					System.getProperty("file.separator") +
					dataName + System.getProperty("file.separator") +
					clientSettings.getClient() + System.getProperty("file.separator") +
					iniFileName);
			clientSettings.setIndexPath(ServerSettings.getInstance().getIndexPath() +
					System.getProperty("file.separator") +
					clientSettings.getClientKey());
			// now parse client.ini.php
			prefs = new IniPreferences(convertIniFile(clientSettings.getClientIniFile()));
			
			clientSettings.setDbType(purgeString(prefs.node("db").get("type",""),true));
			clientSettings.setDbHost(purgeString(prefs.node("db").get("host",""),true));
			clientSettings.setDbPort(purgeString(prefs.node("db").get("port",""),true));
			clientSettings.setDbUser(purgeString(prefs.node("db").get("user",""),true));
			clientSettings.setDbPass(purgeString(prefs.node("db").get("pass",""),true));
			clientSettings.setDbName(purgeString(prefs.node("db").get("name",""),true));
			
			logger.debug("Client ID: " + clientSettings.getClient());
			logger.debug("DB Type: " + clientSettings.getDbType());
			logger.debug("DB Host: " +clientSettings.getDbHost());
			logger.debug("DB Port: " + clientSettings.getDbPort());
			logger.debug("DB Name: " +clientSettings.getDbName());
			logger.debug("DB User: " +clientSettings.getDbUser());
			logger.debug("DB Pass: " +clientSettings.getDbPass());
			
		} 
		catch (IOException e) {
			logger.error("Caught IOException when trying to parse client data: " + e.getMessage());
			throw new ConfigurationException(e);
		} 
		catch (ConfigurationException e) {
			logger.error("Caught ConfigurationException when trying to parse client data.");
			throw e;
		}
		
	}

	/**
	 * 
	 * @param dirty
	 * @param replaceQuotes
	 * @return
	 */
	public String purgeString(String dirty,boolean replaceQuotes) {
		
		if(replaceQuotes) {
			return dirty.replace('"',' ').trim();
		}
		else {
			return dirty.trim();
		}
	}
	
	/**
	 * 
	 * @param dirty
	 * @return
	 */
	public String purgeString(String dirty) {
		
		return purgeString(dirty,false);
	}
	
	/**
	 * 
	 * @return
	 * @throws ConfigurationException 
	 */
	private StringReader convertIniFile(File iniFile) throws ConfigurationException {
		
		try {
			String output;
			InputStreamReader reader = new InputStreamReader(new FileInputStream(iniFile));
			
			int c;
			StringBuilder builder = new StringBuilder();
			
			while((c = reader.read())!=-1){
				builder.append((char)c);
		    }
			output = builder.toString();
			output = output.replaceFirst("<\\?php /\\*","");
			output = output.replaceFirst("\\*/ \\?>","");
			return new StringReader(output);
		} 
		catch (FileNotFoundException e) {
			logger.fatal("Cannot find ini file: " + e.getMessage());
			throw new ConfigurationException(e);
		} 
		catch (IOException e) {
			logger.error("Caught IOException when trying to convert ini file: " + e.getMessage());
			throw new ConfigurationException(e);
		}
	}
	
	
}