import datetime

from django.test import TestCase
from django.urls import reverse
from django.utils import timezone

from .models import Question

# Create your tests here.

class QuestionModelTests(TestCase):
  def test_was_published_recently_with_future_question(self):
    """
    was_published_recently() returns False for questions
    whose pub_date is in the future.
    """
    time = timezone.now() + datetime.timedelta(days=30)
    future_question = Question(pub_date=time)
    self.assertIs(future_question.was_published_recently(), False)
  def test_was_published_recently_with_old_question(self):
    """
    was_published_recently() returns False for questions whose pub_date
    is older than 1 day.
    """
    time = timezone.now() - datetime.timedelta(days=1, seconds=1)
    old_question = Question(pub_date=time)
    self.assertIs(old_question.was_published_recently(), False)

  def test_was_published_recently_with_recent_question(self):
    """
    was_published_recently() returns True for questions whose pub_date
    is within the last day.
    """
    time = timezone.now() - datetime.timedelta(hours=23, minutes=59, seconds=59)
    recent_question = Question(pub_date=time)
    self.assertIs(recent_question.was_published_recently(), True)



def create_question(question_text, days):
  """
  Create a question with the given `question_text` and published the
  given number of `days` offset to now (negative for questions published
  in the past, positive for questions that have yet to be published).
  """
  time = timezone.now() + datetime.timedelta(days=days)
  return Question.objects.create(question_text=question_text, pub_date=time)


class QuestionIndexViewTests(TestCase):
  def test_no_questions(self):
    """
    If no questions exist, an appropriate message is displayed.
    """
    response = self.client.get(reverse('polls:index'))
    self.assertEqual(response.status_code, 200)
    self.assertContains(response, "No polls are available.")
    self.assertQuerysetEqual(response.context['latest_question_list'], [])

  def test_past_question(self):
    """
    Questions with a pub_date in the past are displayed on the
    index page.
    """
    question = create_question(question_text="Past question.", days=-30)
    response = self.client.get(reverse('polls:index'))
    self.assertQuerysetEqual(
        response.context['latest_question_list'],
        [question],
    )

  def test_future_question(self):
    """
    Questions with a pub_date in the future aren't displayed on
    the index page.
    """
    create_question(question_text="Future question.", days=30)
    response = self.client.get(reverse('polls:index'))
    self.assertContains(response, "No polls are available.")
    self.assertQuerysetEqual(response.context['latest_question_list'], [])

  def test_future_question_and_past_question(self):
    """
    Even if both past and future questions exist, only past questions
    are displayed.
    """
    question = create_question(question_text="Past question.", days=-30)
    create_question(question_text="Future question.", days=30)
    response = self.client.get(reverse('polls:index'))
    self.assertQuerysetEqual(
        response.context['latest_question_list'],
        [question],
    )

  def test_two_past_questions(self):
    """
    The questions index page may display multiple questions.
    """
    question1 = create_question(question_text="Past question 1.", days=-30)
    question2 = create_question(question_text="Past question 2.", days=-5)
    response = self.client.get(reverse('polls:index'))
    self.assertQuerysetEqual(
        response.context['latest_question_list'],
        [question2, question1],
    )


class QuestionDetailViewTests(TestCase):
  def test_future_question(self):
    """
    The detail view of a question with a pub_date in the future
    returns a 404 not found.
    """
    future_question = create_question(question_text='Future question.', days=5)
    url = reverse('polls:detail', args=(future_question.id,))
    response = self.client.get(url)
    self.assertEqual(response.status_code, 404)

  def test_past_question(self):
    """
    The detail view of a question with a pub_date in the past
    displays the question's text.
    """
    past_question = create_question(question_text='Past Question.', days=-5)
    url = reverse('polls:detail', args=(past_question.id,))
    response = self.client.get(url)
    self.assertContains(response, past_question.question_text)
