"""
Unit tests for the gating feature in Studio
"""
import json

from mock import patch
from xmodule.modulestore.tests.django_utils import TEST_DATA_SPLIT_MODULESTORE
from xmodule.modulestore.tests.factories import ItemFactory
from contentstore.tests.utils import CourseTestCase
from contentstore.utils import reverse_usage_url
from contentstore.views.item import VisibilityState
from openedx.core.lib.gating.api import GATING_NAMESPACE_QUALIFIER


class TestSubsectionGating(CourseTestCase):
    """
    Tests for the subsection gating feature
    """
    MODULESTORE = TEST_DATA_SPLIT_MODULESTORE
    ENABLED_SIGNALS = ['item_deleted']

    def setUp(self):
        """
        Initial data setup
        """
        super(TestSubsectionGating, self).setUp()

        # Enable subsection gating for the test course
        self.course.enable_subsection_gating = True
        self.save_course()

        # create a chapter
        self.chapter = ItemFactory.create(
            parent_location=self.course.location,
            category='chapter',
            display_name='untitled chapter'
        )

        # create 2 sequentials
        self.seq1 = ItemFactory.create(
            parent_location=self.chapter.location,
            category='sequential',
            display_name='untitled sequential 1'
        )
        self.seq1_url = reverse_usage_url('xblock_handler', self.seq1.location)

        self.seq2 = ItemFactory.create(
            parent_location=self.chapter.location,
            category='sequential',
            display_name='untitled sequential 2'
        )
        self.seq2_url = reverse_usage_url('xblock_handler', self.seq2.location)

    @patch('contentstore.views.item.gating_api.add_prerequisite')
    def test_add_prerequisite(self, mock_add_prereq):
        """
        Test adding a subsection as a prerequisite
        """

        self.client.ajax_post(
            self.seq1_url,
            data={'isPrereq': True}
        )
        mock_add_prereq.assert_called_with(self.course.id, self.seq1.location)

    @patch('contentstore.views.item.gating_api.remove_prerequisite')
    def test_remove_prerequisite(self, mock_remove_prereq):
        """
        Test removing a subsection as a prerequisite
        """

        self.client.ajax_post(
            self.seq1_url,
            data={'isPrereq': False}
        )
        mock_remove_prereq.assert_called_with(self.seq1.location)

    @patch('contentstore.views.item.gating_api.set_required_content')
    def test_add_gate(self, mock_set_required_content):
        """
        Test adding a gated subsection
        """

        self.client.ajax_post(
            self.seq2_url,
            data={'prereqUsageKey': unicode(self.seq1.location), 'prereqMinScore': '100'}
        )
        mock_set_required_content.assert_called_with(
            self.course.id,
            self.seq2.location,
            unicode(self.seq1.location),
            '100'
        )

    @patch('contentstore.views.item.gating_api.set_required_content')
    def test_remove_gate(self, mock_set_required_content):
        """
        Test removing a gated subsection
        """

        self.client.ajax_post(
            self.seq2_url,
            data={'prereqUsageKey': '', 'prereqMinScore': ''}
        )
        mock_set_required_content.assert_called_with(
            self.course.id,
            self.seq2.location,
            '',
            ''
        )

    @patch('contentstore.views.item.gating_api.get_prerequisites')
    @patch('contentstore.views.item.gating_api.get_required_content')
    @patch('contentstore.views.item.gating_api.is_prerequisite')
    def test_get_prerequisite(self, mock_is_prereq, mock_get_required_content, mock_get_prereqs):
        mock_is_prereq.return_value = True
        mock_get_required_content.return_value = unicode(self.seq1.location), 100
        mock_get_prereqs.return_value = [
            {'namespace': '{}{}'.format(unicode(self.seq1.location), GATING_NAMESPACE_QUALIFIER)},
            {'namespace': '{}{}'.format(unicode(self.seq2.location), GATING_NAMESPACE_QUALIFIER)}
        ]
        resp = json.loads(self.client.get_json(self.seq2_url).content)
        mock_is_prereq.assert_called_with(self.course.id, self.seq2.location)
        mock_get_required_content.assert_called_with(self.course.id, self.seq2.location)
        mock_get_prereqs.assert_called_with(self.course.id)
        self.assertTrue(resp['is_prereq'])
        self.assertEqual(resp['prereq'], unicode(self.seq1.location))
        self.assertEqual(resp['prereq_min_score'], 100)
        self.assertEqual(resp['visibility_state'], VisibilityState.gated)

    @patch('contentstore.signals.gating_api.set_required_content')
    @patch('contentstore.signals.gating_api.remove_prerequisite')
    def test_delete_item_signal_handler_called(self, mock_remove_prereq, mock_set_required):
        seq3 = ItemFactory.create(
            parent_location=self.chapter.location,
            category='sequential',
            display_name='untitled sequential 3'
        )
        self.client.delete(reverse_usage_url('xblock_handler', seq3.location))
        mock_remove_prereq.assert_called_with(seq3.location)
        mock_set_required.assert_called_with(seq3.location.course_key, seq3.location, None, None)
