from django.http import HttpResponse

from .models import Question


def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    output = ', '.join([q.question_text for q in latest_question_list])
    return HttpResponse(output)

from django.views import generic
#...

from .models import Question


class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'

    def get_queryset(self):
        """Return the last five published questions."""
        return Question.objects.order_by('-pub_date')[:5]

from django.conf.urls import url

from . import views

app_name = 'polls'
urlpatterns = [
    url(r'^$', views.IndexView.as_view(), name='index'),
    #...
]

def show_list(request, slug=None,
              template_name='podcast/show_list.html',
              page=0, paginate_by=25, mimetype=None):
    """
    Episode list
    ...
    """

    if slug:
        shows = Show.objects.filter(slug__exact=slug)
    else:
        shows = Show.objects.all()

    return object_list(
        request=request,
        queryset=shows,
        template_name=template_name,
        paginate_by=paginate_by,
        page=page)

def recipe_list(request, queryset, *args, **kwargs):
    recipes = queryset
    filter = None
    if request.GET:
        data = request.GET.copy()
        if data.has_key('categoria'):
            filter = Category.objects.get(slug=data.get('categoria'))
            recipes = recipes.filter(categories=filter)
        elif data.has_key('tipo'):
            filter = Meal.objects.get(slug=data.get('tipo'))
            recipes = recipes.filter(meals=filter)
    else:
        recipes = recipes.order_by('-id')[:12]

    return object_list(request,queryset=recipes,extra_context={'filter':filter})

class LectureSessionListView(DynamicCohortMixin, CurriculumBreadcrumbsMixin,
                             FrodoHeadlineMixin, generic.ListView):
    """List of all lecture sessions for a particular cohort."""

    template_name = "curriculum/lecturesession_list.html"
    headline = "Lectures"

    def get_queryset(self):
        """Get list of published lecture sessions for this semester."""
        cohort = self.get_cohort()

        return (LectureSession
                .published.filter(cohort=cohort)
                .select_related('lecture', 'cohort')
                .prefetch_related('staff').order_by('start_at')
                )

from django.conf.urls import url
from views import lectures

urlpatterns = [  #...
        url(r'^lectures/$', lectures.LectureSessionListView.as_view(),
            name='cohort_lectures'),   #...
]

class BreadcrumbsMixin(object):
"""Provide breadcrumbs to curriculum views.

Things that use this must also the the SetHeadlineMixin.
"""

#...

def get_context_data(self, **kwargs):
    context = super(BreadcrumbsMixin, self).get_context_data(**kwargs)

    context['breadcrumbs'] = (
        self.get_breadcrumbs_root()
        + self.get_breadcrumbs_parents()
        + [{'title': self.get_breadcrumb_headline()}]
    )

    return context

class NotebookCreateForm(forms.ModelForm):
    """A form to create a notebook and all the drawings in it."""

    class Meta:
        model = Notebook
        fields = ['title', 'description', 'id', 'drawn_at']
        widgets = {
            'drawn_at': widgets.MonthYearWidget(years=xrange(1980,2050)),
        }

class NotebookCreateView(generic.CreateView):
    """Add a notebook and all of its drawings in one go."""

    model = Notebook
    form_class = NotebookCreateForm
    template_name = 'drawings/notebook_create.html'
    headline = "Upload a Notebook"

    form_invalid_message = "Please correct the error(s)."
    form_valid_message = "Information saved."

    # "if everything worked out that should have"
    def form_valid(self, form):
        # can add addl logic here
        return super(NotebookCreateView, self).form_valid(form)