import datetime

from mock import patch
from nose.plugins.attrib import attr
import pytz
from django.test import RequestFactory

from course_modes.models import CourseMode
from course_modes.tests.factories import CourseModeFactory
from courseware.course_tools import VerifiedUpgradeTool
from courseware.models import DynamicUpgradeDeadlineConfiguration
from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
from openedx.core.djangoapps.schedules.config import CREATE_SCHEDULE_WAFFLE_FLAG
from openedx.core.djangoapps.site_configuration.tests.factories import SiteFactory
from openedx.core.djangoapps.waffle_utils.testutils import override_waffle_flag
from student.tests.factories import CourseEnrollmentFactory, UserFactory
from xmodule.modulestore.tests.django_utils import SharedModuleStoreTestCase
from xmodule.modulestore.tests.factories import CourseFactory


@attr(shard=3)
class VerifiedUpgradeToolTest(SharedModuleStoreTestCase):

    @classmethod
    def setUpClass(cls):
        super(VerifiedUpgradeToolTest, cls).setUpClass()
        cls.now = datetime.datetime.now(pytz.UTC)

        cls.course = CourseFactory.create(
            org='edX',
            number='test',
            display_name='Test Course',
            self_paced=True,
            start=cls.now - datetime.timedelta(days=30),
        )
        cls.course_overview = CourseOverview.get_from_id(cls.course.id)

    @override_waffle_flag(CREATE_SCHEDULE_WAFFLE_FLAG, True)
    def setUp(self):
        super(VerifiedUpgradeToolTest, self).setUp()

        self.course_verified_mode = CourseModeFactory(
            course_id=self.course.id,
            mode_slug=CourseMode.VERIFIED,
            expiration_datetime=self.now + datetime.timedelta(days=30),
        )

        patcher = patch('openedx.core.djangoapps.schedules.signals.get_current_site')
        mock_get_current_site = patcher.start()
        self.addCleanup(patcher.stop)
        mock_get_current_site.return_value = SiteFactory.create()

        DynamicUpgradeDeadlineConfiguration.objects.create(enabled=True)

        self.enrollment = CourseEnrollmentFactory(
            course_id=self.course.id,
            mode=CourseMode.AUDIT,
            course=self.course_overview,
        )
        self.request = RequestFactory().request()
        self.request.user = self.enrollment.user

    def test_tool_visible(self):
        self.assertTrue(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_no_enrollment_exists(self):
        self.enrollment.delete()

        request = RequestFactory().request()
        request.user = UserFactory()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_using_deadline_from_course_mode(self):
        DynamicUpgradeDeadlineConfiguration.objects.create(enabled=False)
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_enrollment_is_inactive(self):
        self.enrollment.is_active = False
        self.enrollment.save()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_already_verified(self):
        self.enrollment.mode = CourseMode.VERIFIED
        self.enrollment.save()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_no_verified_track(self):
        self.course_verified_mode.delete()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_course_deadline_has_passed(self):
        self.course_verified_mode.expiration_datetime = self.now - datetime.timedelta(days=1)
        self.course_verified_mode.save()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))

    def test_not_visible_when_course_mode_has_no_deadline(self):
        self.course_verified_mode.expiration_datetime = None
        self.course_verified_mode.save()
        self.assertFalse(VerifiedUpgradeTool().is_enabled(self.request, self.course.id))
