/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egovernment.moa.id.configuration.helper;


import at.gv.egovernment.moa.id.config.webgui.exception.ConfigurationException;
import at.gv.egovernment.moa.id.configuration.Constants;
import at.gv.egovernment.moa.id.configuration.config.ConfigurationProvider;
import at.gv.egovernment.moa.util.MiscUtil;

import javax.servlet.http.HttpServletRequest;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.ResourceBundle;


import org.apache.log4j.Logger;


public class LanguageHelper {

	private static Logger log = Logger.getLogger(LanguageHelper.class);
	
    private static String errorLanguage(String code, Locale locale) {           
            return ResourceBundle.getBundle("applicationResources", locale).getString(code);
            
    }

    private static String guiLanguage(String code, Locale locale) {            
           return ResourceBundle.getBundle("applicationResources", locale).getString(code);            
            
    }

    public static String getGUIString(String code, HttpServletRequest request) {
        return guiLanguage(code, getLangFromRequest(request));
    }


    public static String getErrorString(String code, HttpServletRequest request) {
        return errorLanguage(code, getLangFromRequest(request));
    }

    public static String getGUIString(String code, String parameter, HttpServletRequest request) {
        return MessageFormat.format(getGUIString(code, request), parameter);
    }

    public static String getErrorString(String code, Object[] parameter, HttpServletRequest request) {

        return MessageFormat.format(getGUIString(code, request), parameter);
    }

    
    private static Locale getLangFromRequest(HttpServletRequest request) {
    	
    	Locale defaultLanguage = Locale.forLanguageTag("de");
    	
		try {
			ConfigurationProvider configurationProvider = ConfigurationProvider.getInstance();
			defaultLanguage = Locale.forLanguageTag(configurationProvider.getDefaultLanguage());
			
		} catch (ConfigurationException e) {
			log.error("Configuration exception while getting ConfigurationProvider instance", e);
		} 
    	
    	
    	if (request == null) {
    		return defaultLanguage;
    		
    	} else {
    		Object obj = request.getSession().getAttribute(Constants.SESSION_I18n);
    		
			if (obj != null && obj instanceof Locale) {    			
				return (Locale) obj;
				
			} else
    			return defaultLanguage;
    		
    	}
    	
    }
}