from datetime import datetime

from django.conf.urls import include, url

from ..staff.models import Person
from .models import Entry, EntryTag
from .views import (
    BlogDateDetailView,
    BlogDayArchiveView,
    BlogMonthArchiveView,
    BlogYearArchiveView,
    custom_index,
    last_name,
    query,
)

extra_context = {}

info_dict = {
    'queryset': Entry.objects.all(),
    'date_field': 'pub_date',
    'extra_context': extra_context,
}

urlpatterns = [
    url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/(?P<day>\w{1,2})/(?P<slug>[-\w]+)/$', BlogDateDetailView.as_view(**info_dict)),
    url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/(?P<day>\w{1,2})/$', BlogDayArchiveView.as_view(**info_dict)),
    url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/$', BlogMonthArchiveView.as_view(**info_dict)),
    url(r'^(?P<year>\d{4})/$', BlogYearArchiveView.as_view(**info_dict)),
    url(r'^$', custom_index, dict(info_dict, paginate_by=4)),
    url(r'^query/$', query),
]

# Code to display authors and tags on each blog page

def all_tags_by_use_amount():
    """Returns all tags with an added 'cnt' attribute (how many times used)

    Also sorts the tags so most-used tags appear first.
    """

    # tally use amount
    retval = []
    current = None
    for obj in EntryTag.objects.filter(entry__pub_date__lte=datetime.now(),
                                       entry__isnull=False).order_by('label'):
        if current is not None and obj.id == current.id:
            current.cnt += 1
        else:
            if current is not None:
                retval.append(current)
            current = obj
            current.cnt = 1
    if current is not None:
        retval.append(current)

    # sort and return
    retval.sort(key=lambda x: -x.cnt)
    return retval

def all_authors():
    return sorted(Person.objects.filter(entry__isnull=False).distinct(),
                  key=last_name)

def all_year_list():
    return Entry.objects.dates('pub_date', 'year')

# The functions are passed to the context uncalled so they will be
# called for each web request.  If we want to only make these database
# queries a single time when a web server process begins, call both
# functions below (i.e. make both lines below end in '()')

extra_context['all_authors'] = all_authors
extra_context['all_tags'] = all_tags_by_use_amount
extra_context['all_year_list'] = all_year_list