package de.intevation.gnv.action;

import de.intevation.gnv.action.sessionmodel.SessionModel;
import de.intevation.gnv.action.sessionmodel.SessionModelFactory;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * Toggle the current language used to create the user interface. Two
 * languages are available now - german and english.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class SwitchLanguageAction extends DescribeUIAction {

    public static Logger logger = Logger.getLogger(SwitchLanguageAction.class);

    @Override
    public ActionForward execute(
        ActionMapping       mapping,
        ActionForm          form,
        HttpServletRequest  request,
        HttpServletResponse response
    ) throws Exception
    {
        SessionModelFactory factory = SessionModelFactory.getInstance();
        SessionModel        sm      = factory.getSessionModel(request);

        sm.setCurrentLocale(switchLanguage(sm.getCurrentLocale()));

        return super.execute(mapping, form, request, response);
    }


    /**
     * This method toggles between german and english language.
     *
     * @param currentLocale The locale which is currently used.
     * @return an english locale, if the current locale is german - otherwise
     * a german locale.
     */
    protected Locale switchLanguage(Locale currentLocale) {
        if (currentLocale.getLanguage().equals(Locale.GERMAN.getLanguage())) {
            logger.info("Switch from german to english locale.");
            return Locale.ENGLISH;
        }
        else {
            logger.info("Switch from english to german locale.");
            return Locale.GERMAN;
        }
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :