import json

import ddt
from django.conf import settings
from django.contrib.auth.models import User
from django.test import TestCase
from django.test.client import Client
from mock import patch, Mock
from opaque_keys.edx.locations import SlashSeparatedCourseKey
from opaque_keys.edx.locator import CourseLocator

from django_comment_common.models import (
    Role, FORUM_ROLE_ADMINISTRATOR, FORUM_ROLE_MODERATOR, FORUM_ROLE_STUDENT
)
from django_comment_common.utils import seed_permissions_roles
from student.models import anonymous_id_for_user, CourseAccessRole, CourseEnrollment, UserProfile
from util.testing import UrlResetMixin


class AutoAuthTestCase(UrlResetMixin, TestCase):
    """
    Base class for AutoAuth Tests that properly resets the urls.py
    """
    URLCONF_MODULES = ['student.urls']


@ddt.ddt
class AutoAuthEnabledTestCase(AutoAuthTestCase):
    """
    Tests for the Auto auth view that we have for load testing.
    """
    COURSE_ID_MONGO = 'edX/Test101/2014_Spring'
    COURSE_ID_SPLIT = 'course-v1:edX+Test101+2014_Spring'
    COURSE_IDS_DDT = (
        (COURSE_ID_MONGO, SlashSeparatedCourseKey.from_deprecated_string(COURSE_ID_MONGO)),
        (COURSE_ID_SPLIT, SlashSeparatedCourseKey.from_deprecated_string(COURSE_ID_SPLIT)),
        (COURSE_ID_MONGO, CourseLocator.from_string(COURSE_ID_MONGO)),
        (COURSE_ID_SPLIT, CourseLocator.from_string(COURSE_ID_SPLIT)),
    )

    @patch.dict("django.conf.settings.FEATURES", {"AUTOMATIC_AUTH_FOR_TESTING": True})
    def setUp(self):
        # Patching the settings.FEATURES['AUTOMATIC_AUTH_FOR_TESTING']
        # value affects the contents of urls.py,
        # so we need to call super.setUp() which reloads urls.py (because
        # of the UrlResetMixin)
        super(AutoAuthEnabledTestCase, self).setUp()
        self.url = '/auto_auth'
        self.client = Client()

    def test_create_user(self):
        """
        Test that user gets created when visiting the page.
        """
        self._auto_auth()
        self.assertEqual(User.objects.count(), 1)
        user = User.objects.all()[0]
        self.assertTrue(user.is_active)
        self.assertFalse(user.profile.requires_parental_consent())

    def test_create_same_user(self):
        self._auto_auth({'username': 'test'})
        self._auto_auth({'username': 'test'})
        self.assertEqual(User.objects.count(), 1)

    def test_create_multiple_users(self):
        """
        Test to make sure multiple users are created.
        """
        self._auto_auth()
        self.client.logout()
        self._auto_auth()
        self.assertEqual(User.objects.all().count(), 2)

    def test_create_defined_user(self):
        """
        Test that the user gets created with the correct attributes
        when they are passed as parameters on the auto-auth page.
        """
        self._auto_auth({
            'username': 'robot', 'password': 'test',
            'email': 'robot@edx.org', 'full_name': "Robot Name"
        })

        # Check that the user has the correct info
        user = User.objects.get(username='robot')
        self.assertEqual(user.username, 'robot')
        self.assertTrue(user.check_password('test'))
        self.assertEqual(user.email, 'robot@edx.org')

        # Check that the user has a profile
        user_profile = UserProfile.objects.get(user=user)
        self.assertEqual(user_profile.name, "Robot Name")

        # By default, the user should not be global staff
        self.assertFalse(user.is_staff)

    def test_create_staff_user(self):

        # Create a staff user
        self._auto_auth({'username': 'test', 'staff': 'true'})
        user = User.objects.get(username='test')
        self.assertTrue(user.is_staff)

        # Revoke staff privileges
        self._auto_auth({'username': 'test', 'staff': 'false'})
        user = User.objects.get(username='test')
        self.assertFalse(user.is_staff)

    @ddt.data(*COURSE_IDS_DDT)
    @ddt.unpack
    def test_course_enrollment(self, course_id, course_key):

        # Create a user and enroll in a course
        self._auto_auth({'username': 'test', 'course_id': course_id})

        # Check that a course enrollment was created for the user
        self.assertEqual(CourseEnrollment.objects.count(), 1)
        enrollment = CourseEnrollment.objects.get(course_id=course_key)
        self.assertEqual(enrollment.user.username, "test")

    @ddt.data(*COURSE_IDS_DDT)
    @ddt.unpack
    def test_double_enrollment(self, course_id, course_key):

        # Create a user and enroll in a course
        self._auto_auth({'username': 'test', 'course_id': course_id})

        # Make the same call again, re-enrolling the student in the same course
        self._auto_auth({'username': 'test', 'course_id': course_id})

        # Check that only one course enrollment was created for the user
        self.assertEqual(CourseEnrollment.objects.count(), 1)
        enrollment = CourseEnrollment.objects.get(course_id=course_key)
        self.assertEqual(enrollment.user.username, "test")

    @ddt.data(*COURSE_IDS_DDT)
    @ddt.unpack
    def test_set_roles(self, course_id, course_key):
        seed_permissions_roles(course_key)
        course_roles = dict((r.name, r) for r in Role.objects.filter(course_id=course_key))
        self.assertEqual(len(course_roles), 4)  # sanity check

        # Student role is assigned by default on course enrollment.
        self._auto_auth({'username': 'a_student', 'course_id': course_id})
        user = User.objects.get(username='a_student')
        user_roles = user.roles.all()
        self.assertEqual(len(user_roles), 1)
        self.assertEqual(user_roles[0], course_roles[FORUM_ROLE_STUDENT])

        self.client.logout()
        self._auto_auth({'username': 'a_moderator', 'course_id': course_id, 'roles': 'Moderator'})
        user = User.objects.get(username='a_moderator')
        user_roles = user.roles.all()
        self.assertEqual(
            set(user_roles),
            set([course_roles[FORUM_ROLE_STUDENT],
                course_roles[FORUM_ROLE_MODERATOR]]))

        # check multiple roles work.
        self.client.logout()
        self._auto_auth({
            'username': 'an_admin', 'course_id': course_id,
            'roles': '{},{}'.format(FORUM_ROLE_MODERATOR, FORUM_ROLE_ADMINISTRATOR)
        })
        user = User.objects.get(username='an_admin')
        user_roles = user.roles.all()
        self.assertEqual(
            set(user_roles),
            set([course_roles[FORUM_ROLE_STUDENT],
                course_roles[FORUM_ROLE_MODERATOR],
                course_roles[FORUM_ROLE_ADMINISTRATOR]]))

    def test_json_response(self):
        """ The view should return JSON. """
        response = self._auto_auth()
        response_data = json.loads(response.content)
        for key in ['created_status', 'username', 'email', 'password', 'user_id', 'anonymous_id']:
            self.assertIn(key, response_data)
        user = User.objects.get(username=response_data['username'])
        self.assertDictContainsSubset(
            {
                'created_status': 'Logged in',
                'anonymous_id': anonymous_id_for_user(user, None),
            },
            response_data
        )

    @ddt.data(*COURSE_IDS_DDT)
    @ddt.unpack
    def test_redirect_to_course(self, course_id, course_key):
        # Create a user and enroll in a course
        response = self._auto_auth({
            'username': 'test',
            'course_id': course_id,
            'redirect': True,
            'staff': 'true',
        }, status_code=302)

        # Check that a course enrollment was created for the user
        self.assertEqual(CourseEnrollment.objects.count(), 1)
        enrollment = CourseEnrollment.objects.get(course_id=course_key)
        self.assertEqual(enrollment.user.username, "test")

        # Check that the redirect was to the course info/outline page
        if settings.ROOT_URLCONF == 'lms.urls':
            url_pattern = '/info'
        else:
            url_pattern = '/course/{}'.format(unicode(course_key))

        self.assertTrue(response.url.endswith(url_pattern))  # pylint: disable=no-member

    def test_redirect_to_main(self):
        # Create user and redirect to 'home' (cms) or 'dashboard' (lms)
        response = self._auto_auth({
            'username': 'test',
            'redirect': True,
            'staff': 'true',
        }, status_code=302)

        # Check that the redirect was to either /dashboard or /home
        if settings.ROOT_URLCONF == 'lms.urls':
            url_pattern = '/dashboard'
        else:
            url_pattern = '/home'

        self.assertTrue(response.url.endswith(url_pattern))  # pylint: disable=no-member

    def test_redirect_to_specified(self):
        # Create user and redirect to specified url
        url_pattern = '/u/test#about_me'
        response = self._auto_auth({
            'username': 'test',
            'redirect_to': url_pattern,
            'staff': 'true',
        }, status_code=302)

        self.assertTrue(response.url.endswith(url_pattern))  # pylint: disable=no-member

    def _auto_auth(self, params=None, status_code=200, **kwargs):
        """
        Make a request to the auto-auth end-point and check
        that the response is successful.

        Arguments:
            params (dict): Dict of params to pass to the auto_auth view
            status_code (int): Expected response status code
            kwargs: Passed directly to the test client's get method.

        Returns:
            Response: The response object for the auto_auth page.
        """
        params = params or {}
        response = self.client.get(self.url, params, **kwargs)

        self.assertEqual(response.status_code, status_code)

        # Check that session and CSRF are set in the response
        for cookie in ['csrftoken', 'sessionid']:
            self.assertIn(cookie, response.cookies)  # pylint: disable=maybe-no-member
            self.assertTrue(response.cookies[cookie].value)  # pylint: disable=maybe-no-member

        return response

    @patch("openedx.core.djangoapps.site_configuration.helpers.get_value", Mock(return_value=False))
    def test_create_account_not_allowed(self):
        """
        Test case to check user creation is forbidden when ALLOW_PUBLIC_ACCOUNT_CREATION feature flag is turned off
        """
        response = self.client.get(self.url)
        self.assertEqual(response.status_code, 403)

    def test_course_access_roles(self):
        """ Passing role names via the course_access_roles query string parameter should create CourseAccessRole
        objects associated with the user.
        """
        expected_roles = ['finance_admin', 'sales_admin']
        course_key = CourseLocator.from_string(self.COURSE_ID_SPLIT)
        params = {
            'course_id': str(course_key),
            'course_access_roles': ','.join(expected_roles)
        }
        response = self._auto_auth(params)
        user_info = json.loads(response.content)

        for role in expected_roles:
            self.assertTrue(
                CourseAccessRole.objects.filter(
                    user__id=user_info['user_id'], course_id=course_key, org=course_key.org, role=role
                ).exists()
            )


class AutoAuthDisabledTestCase(AutoAuthTestCase):
    """
    Test that the page is inaccessible with default settings
    """

    @patch.dict("django.conf.settings.FEATURES", {"AUTOMATIC_AUTH_FOR_TESTING": False})
    def setUp(self):
        # Patching the settings.FEATURES['AUTOMATIC_AUTH_FOR_TESTING']
        # value affects the contents of urls.py,
        # so we need to call super.setUp() which reloads urls.py (because
        # of the UrlResetMixin)
        super(AutoAuthDisabledTestCase, self).setUp()
        self.url = '/auto_auth'
        self.client = Client()

    def test_auto_auth_disabled(self):
        """
        Make sure automatic authentication is disabled.
        """
        response = self.client.get(self.url)
        self.assertEqual(response.status_code, 404)
