from zope.publisher.browser import BrowserLanguages
from Products.iva.interfaces import IUserManager
from zope.component import getUtility
from AccessControl import getSecurityManager
from zope.component import ComponentLookupError

class UILanguage(BrowserLanguages):

    def getPreferredLanguages(self):
        langs = super(UILanguage, self).getPreferredLanguages()
        sm = getSecurityManager()
        if str(sm.getUser()) == 'Anonymous User':
            return langs
        um = None
        try:
            um = getUtility(IUserManager)
        except ComponentLookupError:
            return langs
        u = None
        try:
            u = um.get_user_info(str(sm.getUser()))
        except KeyError:
            pass
        if not u:
            return langs
        if not u.kasKeelBrauserist():
            ul = u.get_language()
            if ul:
                langs.insert(0, ul)
        return langs