"""
Unit tests for course import and export Celery tasks
"""


import copy
import json
from uuid import uuid4

import mock
from django.conf import settings
from django.contrib.auth.models import User
from django.test.utils import override_settings
from opaque_keys.edx.locator import CourseLocator
from organizations.models import OrganizationCourse
from organizations.tests.factories import OrganizationFactory
from user_tasks.models import UserTaskArtifact, UserTaskStatus

from contentstore.tasks import export_olx, rerun_course
from contentstore.tests.test_libraries import LibraryTestCase
from contentstore.tests.utils import CourseTestCase
from course_action_state.models import CourseRerunState
from openedx.core.djangoapps.embargo.models import Country, CountryAccessRule, RestrictedCourse
from xmodule.modulestore.django import modulestore

TEST_DATA_CONTENTSTORE = copy.deepcopy(settings.CONTENTSTORE)
TEST_DATA_CONTENTSTORE['DOC_STORE_CONFIG']['db'] = 'test_xcontent_%s' % uuid4().hex


def side_effect_exception(*args, **kwargs):  # pylint: disable=unused-argument
    """
    Side effect for mocking which raises an exception
    """
    raise Exception('Boom!')


@override_settings(CONTENTSTORE=TEST_DATA_CONTENTSTORE)
class ExportCourseTestCase(CourseTestCase):
    """
    Tests of the export_olx task applied to courses
    """

    def test_success(self):
        """
        Verify that a routine course export task succeeds
        """
        key = str(self.course.location.course_key)
        result = export_olx.delay(self.user.id, key, u'en')
        status = UserTaskStatus.objects.get(task_id=result.id)
        self.assertEqual(status.state, UserTaskStatus.SUCCEEDED)
        artifacts = UserTaskArtifact.objects.filter(status=status)
        self.assertEqual(len(artifacts), 1)
        output = artifacts[0]
        self.assertEqual(output.name, 'Output')

    @mock.patch('contentstore.tasks.export_course_to_xml', side_effect=side_effect_exception)
    def test_exception(self, mock_export):  # pylint: disable=unused-argument
        """
        The export task should fail gracefully if an exception is thrown
        """
        key = str(self.course.location.course_key)
        result = export_olx.delay(self.user.id, key, u'en')
        self._assert_failed(result, json.dumps({u'raw_error_msg': u'Boom!'}))

    def test_invalid_user_id(self):
        """
        Verify that attempts to export a course as an invalid user fail
        """
        user_id = User.objects.order_by(u'-id').first().pk + 100
        key = str(self.course.location.course_key)
        result = export_olx.delay(user_id, key, u'en')
        self._assert_failed(result, u'Unknown User ID: {}'.format(user_id))

    def test_non_course_author(self):
        """
        Verify that users who aren't authors of the course are unable to export it
        """
        _, nonstaff_user = self.create_non_staff_authed_user_client()
        key = str(self.course.location.course_key)
        result = export_olx.delay(nonstaff_user.id, key, u'en')
        self._assert_failed(result, u'Permission denied')

    def _assert_failed(self, task_result, error_message):
        """
        Verify that a task failed with the specified error message
        """
        status = UserTaskStatus.objects.get(task_id=task_result.id)
        self.assertEqual(status.state, UserTaskStatus.FAILED)
        artifacts = UserTaskArtifact.objects.filter(status=status)
        self.assertEqual(len(artifacts), 1)
        error = artifacts[0]
        self.assertEqual(error.name, u'Error')
        self.assertEqual(error.text, error_message)


@override_settings(CONTENTSTORE=TEST_DATA_CONTENTSTORE)
class ExportLibraryTestCase(LibraryTestCase):
    """
    Tests of the export_olx task applied to libraries
    """

    def test_success(self):
        """
        Verify that a routine library export task succeeds
        """
        key = str(self.lib_key)
        result = export_olx.delay(self.user.id, key, u'en')
        status = UserTaskStatus.objects.get(task_id=result.id)
        self.assertEqual(status.state, UserTaskStatus.SUCCEEDED)
        artifacts = UserTaskArtifact.objects.filter(status=status)
        self.assertEqual(len(artifacts), 1)
        output = artifacts[0]
        self.assertEqual(output.name, 'Output')


@override_settings(CONTENTSTORE=TEST_DATA_CONTENTSTORE)
class RerunCourseTaskTestCase(CourseTestCase):
    def _rerun_course(self, old_course_key, new_course_key):
        CourseRerunState.objects.initiated(old_course_key, new_course_key, self.user, 'Test Re-run')
        rerun_course(str(old_course_key), str(new_course_key), self.user.id)

    def test_success(self):
        """ The task should clone the OrganizationCourse and RestrictedCourse data. """
        old_course_key = self.course.id
        new_course_key = CourseLocator(org=old_course_key.org, course=old_course_key.course, run='rerun')

        old_course_id = str(old_course_key)
        new_course_id = str(new_course_key)

        organization = OrganizationFactory()
        OrganizationCourse.objects.create(course_id=old_course_id, organization=organization)

        restricted_course = RestrictedCourse.objects.create(course_key=self.course.id)
        restricted_country = Country.objects.create(country='US')

        CountryAccessRule.objects.create(
            rule_type=CountryAccessRule.BLACKLIST_RULE,
            restricted_course=restricted_course,
            country=restricted_country
        )

        # Run the task!
        self._rerun_course(old_course_key, new_course_key)

        # Verify the new course run exists
        course = modulestore().get_course(new_course_key)
        self.assertIsNotNone(course)

        # Verify the OrganizationCourse is cloned
        self.assertEqual(OrganizationCourse.objects.count(), 2)
        # This will raise an error if the OrganizationCourse object was not cloned
        OrganizationCourse.objects.get(course_id=new_course_id, organization=organization)

        # Verify the RestrictedCourse and related objects are cloned
        self.assertEqual(RestrictedCourse.objects.count(), 2)
        restricted_course = RestrictedCourse.objects.get(course_key=new_course_key)

        self.assertEqual(CountryAccessRule.objects.count(), 2)
        CountryAccessRule.objects.get(
            rule_type=CountryAccessRule.BLACKLIST_RULE,
            restricted_course=restricted_course,
            country=restricted_country
        )