from django.test import TestCase, RequestFactory
from graphene.test import Client
from graphql_relay import to_global_id, from_global_id

from api.schema import schema
from books.factories import ModuleFactory, ChapterFactory, ContentBlockFactory
from users.models import User, SchoolClass
from users.services import create_users

MODULE_QUERY = """
query ModulesQuery($slug: String!) {
  module(slug: $slug) {
      id
      title
      chapters {
        edges {
            node {
                id
                contentBlocks {
                    edges {
                        node {
                            id
                            visibleFor {
                                edges {
                                    node {
                                        name
                                    }
                                }
                            }
                            hiddenFor {
                                edges {
                                    node {
                                        name
                                    }   
                                }
                            }
                        }
                    }
                }
            }
        }
      }
  }  
}
"""

CREATE_SNAPSHOT_MUTATION = """
mutation CreateSnapshot($input: CreateSnapshotInput!) {
    createSnapshot(input: $input) {
        snapshot {
            id
            chapters {
                edges {
                    node {
                        id
                        descriptionHidden
                        titleHidden
                        title
                        description
                        contentBlocks {
                            edges {
                                node {
                                    id
                                    title
                                }
                            }
                        }
                    }
                }
            }
        }
        success
    }
}
"""


def edges_to_array(entity):
    return [edge['node'] for edge in entity.get('edges')]


class CreateSnapshotTestCase(TestCase):
    def setUp(self):
        create_users()
        self.skillbox_class = SchoolClass.objects.get(name='skillbox')
        second_class = SchoolClass.objects.get(name='second_class')
        # teacher will create snapshot
        self.teacher = User.objects.get(username='teacher')
        self.module = ModuleFactory(slug='some-module')
        # module M has a chapter
        self.chapter = ChapterFactory(parent=self.module, slug='some-chapter')
        # chapter has some content blocks a, b, c
        self.title_visible = 'visible'
        self.title_hidden = 'hidden'
        self.title_custom = 'custom'
        self.visible_content_block = ContentBlockFactory(parent=self.chapter, module=self.module,
                                                         title=self.title_visible, slug='cb-a')
        self.hidden_content_block = ContentBlockFactory(parent=self.chapter, module=self.module, title=self.title_hidden, slug='cb-b')
        # content block c is user created
        self.custom_content_block = ContentBlockFactory(parent=self.chapter, owner=self.teacher, user_created=True,
                                                        module=self.module, title=self.title_custom,
                                                        slug='cb-c')
        # content block a and c are visible to school class X
        self.hidden_content_block.hidden_for.add(self.skillbox_class)
        self.custom_content_block.visible_for.add(self.skillbox_class)

        # chapter description is hidden for school class X
        self.chapter.title_hidden_for.add(self.skillbox_class)

        request = RequestFactory().get('/')
        request.user = self.teacher
        self.client = Client(schema=schema, context_value=request)

        # we make a snapshot S of the module M
        # snapshot S looks like module M for school class X

    def test_setup(self):
        # make sure everything is setup correctly
        result = self.client.execute(MODULE_QUERY, variables={
            'slug': self.module.slug
        })
        self.assertIsNone(result.get('errors'))
        module = result.get('data').get('module')
        chapter = edges_to_array(module.get('chapters'))[0]
        self.assertIsNotNone(chapter)
        content_blocks = edges_to_array(chapter.get('contentBlocks'))
        content_block_ids = [node['id'] for node in content_blocks]
        self.assertTrue(to_global_id('ContentBlockNode', self.visible_content_block.id) in content_block_ids)
        self.assertTrue(to_global_id('ContentBlockNode', self.hidden_content_block.id) in content_block_ids)
        self.assertTrue(to_global_id('ContentBlockNode', self.custom_content_block.id) in content_block_ids)
        b = [node for node in content_blocks if
             node['id'] == to_global_id('ContentBlockNode', self.hidden_content_block.id)][0]
        c = [node for node in content_blocks if
             node['id'] == to_global_id('ContentBlockNode', self.custom_content_block.id)][0]
        self.assertTrue('skillbox' in [school_class['name'] for school_class in edges_to_array(b.get('hiddenFor'))])
        self.assertTrue('skillbox' in [school_class['name'] for school_class in edges_to_array(c.get('visibleFor'))])

    def test_create_snapshot(self):
        result = self.client.execute(CREATE_SNAPSHOT_MUTATION, variables={
            'input': {
                'module': to_global_id('ContentBlockNode', self.module.pk),
                'selectedClass': to_global_id('SchoolClassNode', self.skillbox_class.pk),
            }
        })
        self.assertIsNone(result.get('errors'))
        snapshot = result.get('data').get('createSnapshot').get('snapshot')
        chapter = snapshot.get('chapters').get('edges')[0]['node']
        self.assertTrue(chapter['titleHidden'])
        self.assertFalse(chapter['descriptionHidden'])
        _, chapter_id = from_global_id(chapter['id'])
        self.assertEqual(int(chapter_id), self.chapter.id)
        content_blocks = [edge['node'] for edge in chapter['contentBlocks']['edges']]
        self.assertEqual(len(content_blocks), 2)
        self.assertEqual(content_blocks[0]['title'], self.title_visible)
        self.assertEqual(content_blocks[1]['title'], self.title_custom)