from django.http import HttpResponse, Http404, HttpResponseRedirect
from django.template import RequestContext, loader
from django.shortcuts import render, get_object_or_404
from django.core.urlresolvers import reverse
from .models import Question, Choice


def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    context = {
        'latest_question_list': latest_question_list,
    }
    return render(request, 'polls/index.html', context)


def detail(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, 'polls/detail.html', {'question': question})


def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    # choice = get_object_or_404(Choice, pk=choice_id)
    # return render(request, 'polls/result.html', {'choice': choice, 'question': question})
    return render(request, 'polls/result.html', {'question': question})


def vote(request, question_id):
    
p = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = p.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(request, 'polls/detail.html', {
            'question': p,
            '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. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))