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

# Create your views here.
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
		UPDATE: not including questions to be set published in the future
		"""
		return Question.objects.filter(pub_date__lte=timezone.now()).order_by('-pub_date')[:5]

class DetailView(generic.DetailView):
	model = Question
	template_name = 'polls/detail.html'
	
	def get_queryset(self):
		"""
		Excludes any questions that aren't published yet
		"""
		return Question.objects.filter(pub_date__lte=timezone.now())

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


def vote(request, question_id):
	#return HttpResponse("You're voting on question {0}".format(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):
		# Display the question vote form
		return render(request, 'polls/detail.html', {
			'question': question,
			'error_message': 'You didn\'t select a choice.',
		})
	else:
		selected_choice.votes +=1
		selected_choice.save()
		# Always return an HttpResponseRedirect after successfully
		# dealing with POST data. (Prevents data from being POSTed
		# twice if a user hits the back button)
		return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

