# from django.views.generic.list_detail import object_list

from django.views.generic import ListView

from django.views.generic.dates import YearArchiveView, MonthArchiveView, DayArchiveView, DateDetailView

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

from conservancy.apps.staff.models import Person

from django.shortcuts import get_object_or_404, render_to_response

from datetime import datetime

def OR_filter(field_name, objs):

    from django.db.models import Q

    return reduce(lambda x, y: x | y,

                  [Q(**{field_name: x.id}) for x in objs])

def last_name(person):

    return person.formal_name.rpartition(' ')[2]

def custom_index(request, queryset, *args, **kwargs):

    """Blog list view that allows scrolling and also shows an index by

    year.

    """

    kwargs = kwargs.copy()

    kwargs['extra_context'] = kwargs.get('extra_context', {}).copy()

    extra_context = kwargs['extra_context']

    date_field = kwargs['date_field']

    del kwargs['date_field']

    if not kwargs.get('allow_future', False):

        queryset = queryset.filter(**{'%s__lte' % date_field: datetime.now()})

    authors = []

    if 'author' in request.GET:

        authors = [get_object_or_404(Person, username=author)

                   for author in request.GET.getlist('author')]

        extra_context['authors'] = authors

        queryset = queryset.filter(OR_filter('author', authors))

    tags = []

    if 'tag' in request.GET:

        tags = [get_object_or_404(EntryTag, slug=tag)

                for tag in request.GET.getlist('tag')]

        extra_context['tags'] = tags

        queryset = queryset.filter(OR_filter('tags', tags))

    if authors or tags:

        query_string = '&'.join(['author=%s' % a.username for a in authors]

                                + ['tag=%s' % t.slug for t in tags])