from django.contrib.auth.decorators import login_required
from django.views.generic import ListView
from django.utils.translation import ugettext as _
from django.utils.timezone import now
from django.db.models import BooleanField, Value

from judge.utils.cachedict import CacheDict
from judge.models import Profile, Comment, Notification

__all__ = ['NotificationList']

class NotificationList(ListView):
    model = Notification
    context_object_name = 'notifications'
    template_name = 'notification/list.html'
    
    def get_queryset(self):
        self.unseen_cnt = self.request.profile.count_unseen_notifications
        
        query = {
            'owner': self.request.profile,
            'comment__hidden': False,
        }
        self.queryset = Notification.objects.filter(**query)\
                           .order_by('-time')[:100] \
                           .annotate(seen=Value(True, output_field=BooleanField()))
        
        # Mark the several first unseen
        for cnt, q in enumerate(self.queryset):
            if (cnt < self.unseen_cnt):
                q.seen = False
            else:
                break
        
        return self.queryset
    
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['unseen_count'] = self.unseen_cnt
        context['title'] = _('Notifications (%d unseen)' % context['unseen_count'])
        context['has_notifications'] = self.queryset.exists()
        context['page_titles'] = CacheDict(lambda page: Comment.get_page_title(page))
        return context

    def get(self, request, *args, **kwargs):
        ret = super().get(request, *args, **kwargs)
        
        # update after rendering
        Notification.objects.filter(owner=self.request.profile).update(read=True)
        
        return ret