from mock import MagicMock
import datetime

from django.test import TestCase
from django.http import Http404
from django.conf import settings
from django.test.utils import override_settings
from django.contrib.auth.models import User
from django.test.client import RequestFactory

from student.models import CourseEnrollment
from xmodule.modulestore.django import modulestore

import courseware.views as views
from xmodule.modulestore import Location


class Stub():
    pass


# This part is required for modulestore() to work properly
def xml_store_config(data_dir):
    return {
        'default': {
            'ENGINE': 'xmodule.modulestore.xml.XMLModuleStore',
            'OPTIONS': {
                'data_dir': data_dir,
                'default_class': 'xmodule.hidden_module.HiddenDescriptor',
            }
        }
    }

TEST_DATA_DIR = settings.COMMON_TEST_DATA_ROOT
TEST_DATA_XML_MODULESTORE = xml_store_config(TEST_DATA_DIR)


@override_settings(MODULESTORE=TEST_DATA_XML_MODULESTORE)
class TestJumpTo(TestCase):
    """Check the jumpto link for a course"""
    def setUp(self):
        self._MODULESTORES = {}

        # Toy courses should be loaded
        self.course_name = 'edX/toy/2012_Fall'
        self.toy_course = modulestore().get_course('edX/toy/2012_Fall')

    def test_jumpto_invalid_location(self):
        location = Location('i4x', 'edX', 'toy', 'NoSuchPlace', None)
        jumpto_url = '%s/%s/jump_to/%s' % ('/courses', self.course_name, location)
        response = self.client.get(jumpto_url)
        self.assertEqual(response.status_code, 404)

    def test_jumpto_from_chapter(self):
        location = Location('i4x', 'edX', 'toy', 'chapter', 'Overview')
        jumpto_url = '%s/%s/jump_to/%s' % ('/courses', self.course_name, location)
        expected = 'courses/edX/toy/2012_Fall/courseware/Overview/'
        response = self.client.get(jumpto_url)
        self.assertRedirects(response, expected, status_code=302, target_status_code=302)


class ViewsTestCase(TestCase):
    def setUp(self):
        self.user = User.objects.create(username='dummy', password='123456',
                                        email='test@mit.edu')
        self.date = datetime.datetime(2013, 1, 22)
        self.course_id = 'edX/toy/2012_Fall'
        self.enrollment = CourseEnrollment.objects.get_or_create(user=self.user,
                                                  course_id=self.course_id,
                                                  created=self.date)[0]
        self.location = ['tag', 'org', 'course', 'category', 'name']
        self._MODULESTORES = {}
        # This is a CourseDescriptor object
        self.toy_course = modulestore().get_course('edX/toy/2012_Fall')
        self.request_factory = RequestFactory()
        chapter = 'Overview'
        self.chapter_url = '%s/%s/%s' % ('/courses', self.course_id, chapter)

    def test_user_groups(self):
        # depreciated function
        mock_user = MagicMock()
        mock_user.is_authenticated.return_value = False
        self.assertEquals(views.user_groups(mock_user), [])

    def test_get_current_child(self):
        self.assertIsNone(views.get_current_child(Stub()))
        mock_xmodule = MagicMock()
        mock_xmodule.position = -1
        mock_xmodule.get_display_items.return_value = ['one', 'two']
        self.assertEquals(views.get_current_child(mock_xmodule), 'one')
        mock_xmodule_2 = MagicMock()
        mock_xmodule_2.position = 3
        mock_xmodule_2.get_display_items.return_value = []
        self.assertIsNone(views.get_current_child(mock_xmodule_2))

    def test_redirect_to_course_position(self):
        mock_module = MagicMock()
        mock_module.descriptor.id = 'Underwater Basketweaving'
        mock_module.position = 3
        mock_module.get_display_items.return_value = []
        self.assertRaises(Http404, views.redirect_to_course_position,
                          mock_module)

    def test_registered_for_course(self):
        self.assertFalse(views.registered_for_course('Basketweaving', None))
        mock_user = MagicMock()
        mock_user.is_authenticated.return_value = False
        self.assertFalse(views.registered_for_course('dummy', mock_user))
        mock_course = MagicMock()
        mock_course.id = self.course_id
        self.assertTrue(views.registered_for_course(mock_course, self.user))

    def test_jump_to_invalid(self):
        request = self.request_factory.get(self.chapter_url)
        self.assertRaisesRegexp(Http404, 'Invalid location', views.jump_to,
                                request, 'bar', ())
        self.assertRaisesRegexp(Http404, 'No data*', views.jump_to, request,
                                'dummy', self.location)

    def test_no_end_on_about_page(self):
        # Toy course has no course end date or about/end_date blob
        self.verify_end_date(self.course_id)

    def test_no_end_about_blob(self):
        # test_end has a course end date, no end_date HTML blob
        self.verify_end_date("edX/test_end/2012_Fall", "Sep 17, 2015")

    def test_about_blob_end_date(self):
        # test_about_blob_end_date has both a course end date and an end_date HTML blob.
        # HTML blob wins
        self.verify_end_date("edX/test_about_blob_end_date/2012_Fall", "Learning never ends")

    def verify_end_date(self, course_id, expected_end_text=None):
        request = self.request_factory.get("foo")
        request.user = self.user
        result = views.course_about(request, course_id)
        if expected_end_text is not None:
            self.assertContains(result, "Classes End")
            self.assertContains(result, expected_end_text)
        else:
            self.assertNotContains(result, "Classes End")