package net.sourceforge.fenixedu.presentationTier.Action.publico;

import java.util.Locale;

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

import net.sourceforge.fenixedu.presentationTier.Action.base.FenixAction;
import net.sourceforge.fenixedu.presentationTier.servlets.filters.ContentInjectionRewriter;

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

import pt.ist.fenixWebFramework.servlets.filters.I18NFilter;

public class ChangeLocale extends FenixAction {

    public ActionForward execute(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	final Locale locale = constructNewLocale(request);
	I18NFilter.setLocale(request, request.getSession(true), locale);

	// HACK: remove locale parameter if present
	String windowLocation = filterLocaleFromLocation(request.getParameter("windowLocation"));
	return forward(windowLocation);
    }

    private String filterLocaleFromLocation(String parameter) {
	if (parameter == null) {
	    return parameter;
	}

	return parameter.replaceAll("&locale=[\\p{Alpha}-]*", "").replaceAll("\\?locale=[\\p{Alpha}-]*", "");
    }

    private Locale constructNewLocale(HttpServletRequest request) {
	final String newLanguage = request.getParameter("newLanguage");
	final String newCountry = request.getParameter("newCountry");
	final String newVariant = request.getParameter("newVariant");
	return newVariant == null ? new Locale(newLanguage, newCountry) : new Locale(newLanguage, newCountry, newVariant);
    }

    private ActionForward forward(final String windowLocation) {
	final ActionForward actionForward = new ActionForward();
	actionForward.setName(windowLocation);
	actionForward.setPath(windowLocation);
	actionForward.setRedirect(true);
	return actionForward;
    }

}