from django.template import loader
from django.http import HttpResponse, HttpResponseRedirect
from .models import Question, Choice
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from django.views import generic
import matplotlib.pyplot as plt
import mpld3
import numpy as np

def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    choices = question.choice_set.all()
    for choice in choices:
        print(choice.choice_text, choice.votes)

    fig, ax = plt.subplots()
    sizes = np.array([choice.votes for choice in choices])
    ax.pie([choice.votes for choice in choices],
            labels=[choice.choice_text for choice in choices],
            autopct=lambda val: (val/100.*sizes.sum()).astype(int),
            shadow=True, startangle=90)
    ax.axis('equal')
    g = mpld3.fig_to_html(fig)
    return render(request, 'polls/results_graph.html', context={'g': g})

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

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

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


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


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

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):
        # Redisplay the question voting 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. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))