from django.contrib.sitemaps import Sitemap
from forum.models import Question
from django.conf import settings

class QuestionsSitemap(Sitemap):
    changefreq = 'daily'
    priority = 0.5
    def items(self):
        return Question.objects.filter_state(deleted=False)

    def lastmod(self, obj):
        return obj.last_activity_at

    def location(self, obj):
        return obj.get_absolute_url()

    def __get(self, name, obj, default=None):
        try:
            attr = getattr(self, name)
        except AttributeError:
            return default
        if callable(attr):
            return attr(obj)
        return attr

    def get_urls(self, page=1):
        urls = []
        for item in self.paginator.page(page).object_list:
            loc = "%s%s" % (settings.APP_URL, self.__get('location', item))
            url_info = {
                'location':   loc,
                'lastmod':    self.__get('lastmod', item, None),
                'changefreq': self.__get('changefreq', item, None),
                'priority':   self.__get('priority', item, None)
            }
            urls.append(url_info)
        return urls