import datetime
from django.test import TestCase
from django.utils import timezone
from django.core.urlresolvers import reverse

from .models import Question


def create_question(question_text, days):
	"""
	Creates a question with the given `question_text` 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 QuestionViewTests(TestCase):
	def test_index_view_with_no_questions(self):
		"""
		If no questions exist, an appropriate message should be 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_index_view_with_a_past_question(self):
		"""
		Questions with a pub_date in the past should be displayed on the
		index page.
		"""
		create_question(question_text="Past question.", days=-30)
		response = self.client.get(reverse('polls:index'))
		self.assertQuerysetEqual(
			response.context['latest_question_list'],
			['<Question: Past question.>']
		)

	def test_index_view_with_a_future_question(self):
		"""
		Questions with a pub_date in the future should not be 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.",
							status_code=200)
		self.assertQuerysetEqual(response.context['latest_question_list'], [])

	def test_index_view_with_future_question_and_past_question(self):
		"""
		Even if both past and future questions exist, only past questions
		should be displayed.
		"""
		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: Past question.>']
		)

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


class QuestionMethodTests(TestCase):
	def test_was_published_recently_with_future_question(self):
		"""
		was_publis_recently() should return False for questions whore pub_date
		is in the future
		"""
		time = timezone.now() + datetime.timedelta(days=30)
		future_question = Question(pub_date=time)
		self.assertEqual(future_question.was_published_recently(), False)

	def test_was_published_recently_with_old_question(self):
		"""
		was_published_recently() should return False for questions whose
		pub_date is older than 1 day.
		"""
		time = timezone.now() - datetime.timedelta(days=30)
		old_question = Question(pub_date=time)
		self.assertEqual(old_question.was_published_recently(), False)

	def test_was_published_recently_with_recent_question(self):
		"""
		was_published_recently() should return False for questions whose
		pub_date is within the last day.
		"""
		time = timezone.now() - datetime.timedelta(hours=1)
		recent_question = Question(pub_date=time)
		self.assertEqual(recent_question.was_published_recently(), True)


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

	def test_detail_view_with_a_past_question(self):
		"""
		The detail view of a question with a pub_date in the past should
		display the question's text.
		"""
		past_question = create_question(question_text='Past Question.', days=-5)
		response = self.client.get(reverse('polls:detail', args=(past_question.id,)))
		self.assertContains(response, past_question.question_text, status_code=200)
