import os

import re

from django.conf import settings

from django.contrib.auth import SESSION_KEY

from django.contrib.auth.forms import AuthenticationForm

from django.contrib.sites.models import Site, RequestSite

from django.contrib.auth.models import User

from django.test import TestCase

from django.core import mail

from django.core.urlresolvers import reverse

class AuthViewsTestCase(TestCase):

    """

    Helper base class for all the follow test cases.

    """

    fixtures = ['authtestdata.json']

    urls = 'django.contrib.auth.urls'

    def setUp(self):

        self.old_LANGUAGES = settings.LANGUAGES

        self.old_LANGUAGE_CODE = settings.LANGUAGE_CODE

        settings.LANGUAGES = (('en', 'English'),)

        settings.LANGUAGE_CODE = 'en'

        self.old_TEMPLATE_DIRS = settings.TEMPLATE_DIRS

        settings.TEMPLATE_DIRS = (

            os.path.join(

                os.path.dirname(__file__),

                'templates'

            )

        ,)

    def tearDown(self):

        settings.LANGUAGES = self.old_LANGUAGES

        settings.LANGUAGE_CODE = self.old_LANGUAGE_CODE

        settings.TEMPLATE_DIRS = self.old_TEMPLATE_DIRS

class PasswordResetTest(AuthViewsTestCase):

    def setUp(self):

        self.old_LANGUAGES = settings.LANGUAGES

        self.old_LANGUAGE_CODE = settings.LANGUAGE_CODE

        settings.LANGUAGES = (('en', 'English'),)

        settings.LANGUAGE_CODE = 'en'

    def tearDown(self):

        settings.LANGUAGES = self.old_LANGUAGES

        settings.LANGUAGE_CODE = self.old_LANGUAGE_CODE

    def test_email_not_found(self):

        "Error is raised if the provided email address isn't currently registered"

        response = self.client.get('/password_reset/')

        self.assertEquals(response.status_code, 200)

        response = self.client.post('/password_reset/', {'email': 'not_a_real_email@email.com'})

        self.assertContains(response, "That e-mail address doesn't have an associated user account")

        self.assertEquals(len(mail.outbox), 0)

    def test_email_found(self):

        "Email is sent if a valid email address is provided for password reset"

        response = self.client.post('/password_reset/', {'email': 'staffmember@example.com'})

        self.assertEquals(response.status_code, 302)

        self.assertEquals(len(mail.outbox), 1)

        self.assert_("http://" in mail.outbox[0].body)

    def _test_confirm_start(self):

        # Start by creating the email

        response = self.client.post('/password_reset/', {'email': 'staffmember@example.com'})

        self.assertEquals(response.status_code, 302)

        self.assertEquals(len(mail.outbox), 1)

        return self._read_signup_email(mail.outbox[0])

    def _read_signup_email(self, email):

        urlmatch = re.search(r"https?://[^/]*(/.*reset/\S*)", email.body)

        self.assert_(urlmatch is not None, "No URL found in sent email")

        return urlmatch.group(), urlmatch.groups()[0]

    def test_confirm_valid(self):

        url, path = self._test_confirm_start()

        response = self.client.get(path)

        # redirect to a 'complete' page:

        self.assertEquals(response.status_code, 200)

        self.assert_("Please enter your new password" in response.content)

    def test_confirm_invalid(self):

        url, path = self._test_confirm_start()

        # Let's munge the token in the path, but keep the same length,

        # in case the URLconf will reject a different length.

        path = path[:-5] + ("0"*4) + path[-1]

        response = self.client.get(path)

        self.assertEquals(response.status_code, 200)

        self.assert_("The password reset link was invalid" in response.content)

    def test_confirm_invalid_post(self):

        # Same as test_confirm_invalid, but trying

        # to do a POST instead.

        url, path = self._test_confirm_start()

        path = path[:-5] + ("0"*4) + path[-1]

        response = self.client.post(path, {'new_password1': 'anewpassword',

                                           'new_password2':' anewpassword'})

        # Check the password has not been changed

        u = User.objects.get(email='staffmember@example.com')

        self.assert_(not u.check_password("anewpassword"))

    def test_confirm_complete(self):

        url, path = self._test_confirm_start()

        response = self.client.post(path, {'new_password1': 'anewpassword',

                                           'new_password2': 'anewpassword'})

        # It redirects us to a 'complete' page:

        self.assertEquals(response.status_code, 302)

        # Check the password has been changed

        u = User.objects.get(email='staffmember@example.com')

        self.assert_(u.check_password("anewpassword"))

        # Check we can't use the link again

        response = self.client.get(path)

        self.assertEquals(response.status_code, 200)

        self.assert_("The password reset link was invalid" in response.content)

    def test_confirm_different_passwords(self):

        url, path = self._test_confirm_start()

        response = self.client.post(path, {'new_password1': 'anewpassword',

                                           'new_password2':' x'})

        self.assertEquals(response.status_code, 200)

        self.assert_("The two password fields didn't match" in response.content)

class ChangePasswordTest(AuthViewsTestCase):

    def login(self, password='password'):

        response = self.client.post('/login/', {

            'username': 'testclient',

            'password': password

            }

        )

        self.assertEquals(response.status_code, 302)

        self.assert_(response['Location'].endswith(settings.LOGIN_REDIRECT_URL))

    def fail_login(self, password='password'):

        response = self.client.post('/login/', {

            'username': 'testclient',

            'password': password

            }

        )

        self.assertEquals(response.status_code, 200)

        self.assert_("Please enter a correct username and password. Note that both fields are case-sensitive." in response.content)

    def logout(self):

        response = self.client.get('/logout/')

    def test_password_change_fails_with_invalid_old_password(self):

        self.login()

        response = self.client.post('/password_change/', {

            'old_password': 'donuts',

            'new_password1': 'password1',

            'new_password2': 'password1',

            }

        )

        self.assertEquals(response.status_code, 200)

        self.assert_("Your old password was entered incorrectly. Please enter it again." in response.content)

    def test_password_change_fails_with_mismatched_passwords(self):

        self.login()

        response = self.client.post('/password_change/', {

            'old_password': 'password',

            'new_password1': 'password1',

            'new_password2': 'donuts',

            }

        )

        self.assertEquals(response.status_code, 200)

        self.assert_("The two password fields didn't match." in response.content)

    def test_password_change_succeeds(self):

        self.login()

        response = self.client.post('/password_change/', {

            'old_password': 'password',

            'new_password1': 'password1',

            'new_password2': 'password1',

            }

        )

        self.assertEquals(response.status_code, 302)

        self.assert_(response['Location'].endswith('/password_change/done/'))

        self.fail_login()

        self.login(password='password1')

class LoginTest(AuthViewsTestCase):

    def test_current_site_in_context_after_login(self):

        response = self.client.get(reverse('django.contrib.auth.views.login'))

        self.assertEquals(response.status_code, 200)

        site = Site.objects.get_current()

        self.assertEquals(response.context['site'], site)

        self.assertEquals(response.context['site_name'], site.name)

        self.assert_(isinstance(response.context['form'], AuthenticationForm), 

                     'Login form is not an AuthenticationForm')

class LogoutTest(AuthViewsTestCase):

    urls = 'django.contrib.auth.tests.urls'

    def login(self, password='password'):

        response = self.client.post('/login/', {

            'username': 'testclient',

            'password': password

            }

        )

        self.assertEquals(response.status_code, 302)

        self.assert_(response['Location'].endswith(settings.LOGIN_REDIRECT_URL))

        self.assert_(SESSION_KEY in self.client.session)

    def confirm_logged_out(self):

        self.assert_(SESSION_KEY not in self.client.session)

    def test_logout_default(self):

        "Logout without next_page option renders the default template"

        self.login()

        response = self.client.get('/logout/')

        self.assertEquals(200, response.status_code)

        self.assert_('Logged out' in response.content)

        self.confirm_logged_out()

    def test_logout_with_next_page_specified(self): 

        "Logout with next_page option given redirects to specified resource"

        self.login()

        response = self.client.get('/logout/next_page/')

        self.assertEqual(response.status_code, 302)

        self.assert_(response['Location'].endswith('/somewhere/'))

        self.confirm_logged_out()

    def test_logout_with_redirect_argument(self):

        "Logout with query string redirects to specified resource"

        self.login()

        response = self.client.get('/logout/?next=/login/')

        self.assertEqual(response.status_code, 302)

        self.assert_(response['Location'].endswith('/login/'))

        self.confirm_logged_out()

    def test_logout_with_custom_redirect_argument(self):

        "Logout with custom query string redirects to specified resource"

        self.login()

        response = self.client.get('/logout/custom_query/?follow=/somewhere/')

        self.assertEqual(response.status_code, 302)

        self.assert_(response['Location'].endswith('/somewhere/'))

        self.confirm_logged_out()