from django.contrib.auth.models import User
from django.test import TestCase
from django.urls import reverse

from polls.models import Vote, Poll, Option


class PollDetailsTests(
    TestCase,
):
    def fresh_user_logged_in(
            self,
    ):
        test_user = User.objects.create_user(
            "test",
            password="test",
        )
        self.client.force_login(
            test_user,
        )

        return test_user

    def create_poll_with_questions(
            self,
            questions=3,
    ):
        poll = Poll.objects.create(
            question="Testing Question",
        )
        for i in range(questions):
            Option.objects.create(
                poll=poll,
                text=f"Option #{i}",
            )
        return poll

    def test_shows_options_if_not_voted(
            self,
    ):
        """
        If test user has not yet voted, options should be shown
        """
        self.fresh_user_logged_in()
        poll = self.create_poll_with_questions()

        response = self.client.get(
            reverse(
                "poll-details",
                kwargs={
                    "poll_id": poll.pk,
                }
            ),
        )
        self.assertEqual(
            response.status_code,
            200,
        )
        self.assertContains(
            response,
            "Select from one of the following options:",
        )
        options = Option.objects.filter(
            poll=poll,
        )
        self.assertQuerySetEqual(
            response.context["options"],
            options,
        )

    def test_shows_results_if_voted(
            self,
    ):
        """
        If test user has already voted, results should be shown
        """
        test_user = self.fresh_user_logged_in()
        poll = self.create_poll_with_questions()
        options = Option.objects.filter(
            poll=poll,
        )

        Vote.objects.create(
            poll=poll,
            option=options[0],
            user=test_user,
        )

        response = self.client.get(
            reverse(
                "poll-details",
                kwargs={
                    "poll_id": poll.pk,
                }
            ),
        )
        self.assertEqual(
            response.status_code,
            200,
        )
        self.assertNotContains(
            response,
            "Select from one of the following options:",
        )
        self.assertContains(
            response,
            "Review the poll results below",
        )

    def test_re_voting_doesnt_change_votes(
            self,
    ):
        """
        If test user has already voted, voting again should not change anything
        """
        test_user = self.fresh_user_logged_in()
        poll = self.create_poll_with_questions()
        options = Option.objects.filter(
            poll=poll,
        )

        Vote.objects.create(
            poll=poll,
            option=options[0],
            user=test_user,
        )

        self.assertEqual(
            Vote.objects.count(),
            1,
        )
        response = self.client.post(
            reverse(
                "cast-vote",
                kwargs={
                    "poll_id": poll.pk,
                    "option_id": options[1].pk,
                }
            ),
        )
        self.assertEqual(
            response.status_code,
            200,
        )
        self.assertEqual(
            Vote.objects.count(),
            1,
        )

    def test_unauthenticated_user_cant_vote(
            self,
    ):
        """
        If an unauthenticated user tries to vote it should fail
        """
        poll = self.create_poll_with_questions()
        options = Option.objects.filter(
            poll=poll,
        )

        self.assertEqual(
            Vote.objects.count(),
            0,
        )

        response = self.client.post(
            reverse(
                "cast-vote",
                kwargs={
                    "poll_id": poll.pk,
                    "option_id": options[0].pk,
                }
            ),
        )
        self.assertNotEqual(
            response.status_code,
            200,
        )
        self.assertEqual(
            Vote.objects.count(),
            0,
        )