import os
from django.conf import settings
from django.contrib.auth.models import User
from django.test import TestCase, Client

class FlatpageCSRFTests(TestCase):
    fixtures = ['sample_flatpages']
    urls = 'django.contrib.flatpages.tests.urls'

    def setUp(self):
        self.client = Client(enforce_csrf_checks=True)
        self.old_MIDDLEWARE_CLASSES = settings.MIDDLEWARE_CLASSES
        flatpage_middleware_class = 'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware'
        csrf_middleware_class = 'django.middleware.csrf.CsrfViewMiddleware'
        if csrf_middleware_class not in settings.MIDDLEWARE_CLASSES:
            settings.MIDDLEWARE_CLASSES += (csrf_middleware_class,)
        if flatpage_middleware_class not in settings.MIDDLEWARE_CLASSES:
            settings.MIDDLEWARE_CLASSES += (flatpage_middleware_class,)
        self.old_TEMPLATE_DIRS = settings.TEMPLATE_DIRS
        settings.TEMPLATE_DIRS = (
            os.path.join(
                os.path.dirname(__file__),
                'templates'
            ),
        )
        self.old_LOGIN_URL = settings.LOGIN_URL
        settings.LOGIN_URL = '/accounts/login/'

    def tearDown(self):
        settings.MIDDLEWARE_CLASSES = self.old_MIDDLEWARE_CLASSES
        settings.TEMPLATE_DIRS = self.old_TEMPLATE_DIRS
        settings.LOGIN_URL = self.old_LOGIN_URL

    def test_view_flatpage(self):
        "A flatpage can be served through a view, even when the middleware is in use"
        response = self.client.get('/flatpage_root/flatpage/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "<p>Isn't it flat!</p>")

    def test_view_non_existent_flatpage(self):
        "A non-existent flatpage raises 404 when served through a view, even when the middleware is in use"
        response = self.client.get('/flatpage_root/no_such_flatpage/')
        self.assertEqual(response.status_code, 404)

    def test_view_authenticated_flatpage(self):
        "A flatpage served through a view can require authentication"
        response = self.client.get('/flatpage_root/sekrit/')
        self.assertRedirects(response, '/accounts/login/?next=/flatpage_root/sekrit/')
        User.objects.create_user('testuser', 'test@example.com', 's3krit')
        self.client.login(username='testuser',password='s3krit')
        response = self.client.get('/flatpage_root/sekrit/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "<p>Isn't it sekrit!</p>")

    def test_fallback_flatpage(self):
        "A flatpage can be served by the fallback middlware"
        response = self.client.get('/flatpage/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "<p>Isn't it flat!</p>")

    def test_fallback_non_existent_flatpage(self):
        "A non-existent flatpage raises a 404 when served by the fallback middlware"
        response = self.client.get('/no_such_flatpage/')
        self.assertEqual(response.status_code, 404)

    def test_post_view_flatpage(self):
        "POSTing to a flatpage served through a view will raise a CSRF error if no token is provided (Refs #14156)"
        response = self.client.post('/flatpage_root/flatpage/')
        self.assertEqual(response.status_code, 403)

    def test_post_fallback_flatpage(self):
        "POSTing to a flatpage served by the middleware will raise a CSRF error if no token is provided (Refs #14156)"
        response = self.client.post('/flatpage/')
        self.assertEqual(response.status_code, 403)

    def test_post_unknown_page(self):
        "POSTing to an unknown page isn't caught as a 403 CSRF error"
        response = self.client.post('/no_such_page/')
        self.assertEqual(response.status_code, 404)
