from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse, Http404, HttpResponseRedirect
from django.core.urlresolvers import reverse
from django.views import generic
from django.utils import timezone
from .models import Question, Choice

# Create your views here.

class IndexView(generic.ListView):
    


class DetailView(generic.DetailView):
    model = Question
    template_name = 'polls/detail.html'

    def get_queryset(self):
        """

        :return: Only objects that have been published.
        """
        return Question.objects.filter(pub_date__lte = timezone.now())

class ResultsView(generic.DetailView):
    model = Question
    template_name = 'polls/results.html'

    def get_queryset(self):
        """

        :return: Objects published in the past.
        Add: Question.choice_set__ne = [] to conditions later.
        """
        return Question.objects.filter(pub_date__lte = timezone.now())


def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Render the voting form again.
        return render(request,
                      'polls/detail.html',
                      {
                          'question': question,
                          'error_message': "You didn't select a choice."
                      })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        return HttpResponseRedirect(reverse('polls:results', args=(question_id,)))

template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'
    def get_queryset(self):
        """
        Return the last 5 question by order published, not including those from the future.
        """
        return Question.objects.filter(
            pub_date__lte = timezone.now()).order_by('-pub_date')[:5]