text: # -*- coding: utf-8 -*-
  from django.db import models
  from django.utils import timezone
  from django.utils.translation import ugettext_lazy as _
  from cms.models.managers import TitleManager
  from cms.models.pagemodel import Page
  from cms.utils.helpers import reversion_register
  
  
  class Title(models.Model):
      language = models.CharField(_("language"), max_length=15, db_index=True)
      title = models.CharField(_("title"), max_length=255)
      page_title = models.CharField(_("title"), max_length=255, blank=True, null=True,
                                    help_text=_("overwrite the title (html title tag)"))
      menu_title = models.CharField(_("title"), max_length=255, blank=True, null=True,
                                    help_text=_("overwrite the title in the menu"))
      meta_description = models.TextField(_("description"), max_length=155, blank=True, null=True,
                                          help_text=_("The text displayed in search engines."))
      slug = models.SlugField(_("slug"), max_length=255, db_index=True, unique=False)
      path = models.CharField(_("Path"), max_length=255, db_index=True)
      has_url_overwrite = models.BooleanField(_("has url overwrite"), default=False, db_index=True, editable=False)
      application_urls = models.CharField(_('application'), max_length=200, blank=True, null=True, db_index=True)
      redirect = models.CharField(_("redirect"), max_length=255, blank=True, null=True)
      page = models.ForeignKey(Page, verbose_name=_("page"), related_name="title_set")
      creation_date = models.DateTimeField(_("creation date"), editable=False, default=timezone.now)
      objects = TitleManager()
  
      class Meta:
          unique_together = (('language', 'page'),)
          app_label = 'cms'
  
      def __unicode__(self):
          return u"%s (%s, %s)" % (self.title, self.slug, self.language)
  
      def update_path(self):
          # Build path from parent page's path and slug
          slug = u'%s' % self.slug
          if not self.has_url_overwrite:
              self.path = u'%s' % slug
              if self.page.parent_id:
                  parent_page = self.page.parent_id
  
                  parent_title = Title.objects.get_title(parent_page, language=self.language, language_fallback=True)
                  if parent_title:
                      self.path = u'%s/%s' % (parent_title.path, slug)
  
  
      @property
      def overwrite_url(self):
          """Return overwritten url, or None
          """
          if self.has_url_overwrite:
              return self.path
          return None
  
  
  class EmptyTitle(object):
      """Empty title object, can be returned from Page.get_title_obj() if required
      title object doesn't exists.
      """
      title = ""
      slug = ""
      path = ""
      meta_description = ""
      redirect = ""
      has_url_overwite = False
      application_urls = ""
      menu_title = ""
      page_title = ""
  
      @property
      def overwrite_url(self):
          return None
  
  
  reversion_register(Title)
  