"""
Unit tests for the notes app.
"""

import json

from django.contrib.auth.models import User
from django.core.exceptions import ValidationError
from django.core.urlresolvers import reverse
from django.test import RequestFactory, TestCase
from django.test.client import Client
from mock import Mock, patch
from opaque_keys.edx.locations import SlashSeparatedCourseKey

from courseware.tabs import CourseTab, get_course_tab_list
from notes import api, models, utils
from student.tests.factories import CourseEnrollmentFactory, UserFactory
from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
from xmodule.modulestore.tests.factories import CourseFactory


class UtilsTest(ModuleStoreTestCase):
    """ Tests for the notes utils. """
    def setUp(self):
        '''
        Setup a dummy course-like object with a tabs field that can be
        accessed via attribute lookup.
        '''
        super(UtilsTest, self).setUp()
        self.course = CourseFactory.create()

    def test_notes_not_enabled(self):
        '''
        Tests that notes are disabled when the course tab configuration does NOT
        contain a tab with type "notes."
        '''
        self.assertFalse(utils.notes_enabled_for_course(self.course))

    def test_notes_enabled(self):
        '''
        Tests that notes are enabled when the course tab configuration contains
        a tab with type "notes."
        '''
        with self.settings(FEATURES={'ENABLE_STUDENT_NOTES': True}):
            self.course.advanced_modules = ["notes"]
            self.assertTrue(utils.notes_enabled_for_course(self.course))


class CourseTabTest(ModuleStoreTestCase):
    """
    Test that the course tab shows up the way we expect.
    """
    def setUp(self):
        '''
        Setup a dummy course-like object with a tabs field that can be
        accessed via attribute lookup.
        '''
        super(CourseTabTest, self).setUp()
        self.course = CourseFactory.create()
        self.user = UserFactory()
        CourseEnrollmentFactory.create(user=self.user, course_id=self.course.id)

    def enable_notes(self):
        """Enable notes and add the tab to the course."""
        self.course.tabs.append(CourseTab.load("notes"))
        self.course.advanced_modules = ["notes"]

    def has_notes_tab(self, course, user):
        """ Returns true if the current course and user have a notes tab, false otherwise. """
        request = RequestFactory().request()
        request.user = user
        all_tabs = get_course_tab_list(request, course)
        return any([tab.name == u'My Notes' for tab in all_tabs])

    def test_course_tab_not_visible(self):
        # module not enabled in the course
        self.assertFalse(self.has_notes_tab(self.course, self.user))

        with self.settings(FEATURES={'ENABLE_STUDENT_NOTES': False}):
            # setting not enabled and the module is not enabled
            self.assertFalse(self.has_notes_tab(self.course, self.user))

            # module is enabled and the setting is not enabled
            self.course.advanced_modules = ["notes"]
            self.assertFalse(self.has_notes_tab(self.course, self.user))

    def test_course_tab_visible(self):
        self.enable_notes()
        self.assertTrue(self.has_notes_tab(self.course, self.user))
        self.course.advanced_modules = []
        self.assertFalse(self.has_notes_tab(self.course, self.user))


class ApiTest(TestCase):

    def setUp(self):
        super(ApiTest, self).setUp()
        self.client = Client()

        # Mocks
        patcher = patch.object(api, 'api_enabled', Mock(return_value=True))
        patcher.start()
        self.addCleanup(patcher.stop)

        # Create two accounts
        self.password = 'abc'
        self.student = User.objects.create_user('student', 'student@test.com', self.password)
        self.student2 = User.objects.create_user('student2', 'student2@test.com', self.password)
        self.instructor = User.objects.create_user('instructor', 'instructor@test.com', self.password)
        self.course_key = SlashSeparatedCourseKey('HarvardX', 'CB22x', 'The_Ancient_Greek_Hero')
        self.note = {
            'user': self.student,
            'course_id': self.course_key,
            'uri': '/',
            'text': 'foo',
            'quote': 'bar',
            'range_start': 0,
            'range_start_offset': 0,
            'range_end': 100,
            'range_end_offset': 0,
            'tags': 'a,b,c'
        }

        # Make sure no note with this ID ever exists for testing purposes
        self.NOTE_ID_DOES_NOT_EXIST = 99999

    def login(self, as_student=None):
        username = None
        password = self.password

        if as_student is None:
            username = self.student.username
        else:
            username = as_student.username

        self.client.login(username=username, password=password)

    def url(self, name, args={}):
        args.update({'course_id': self.course_key.to_deprecated_string()})
        return reverse(name, kwargs=args)

    def create_notes(self, num_notes, create=True):
        notes = []
        for __ in range(num_notes):
            note = models.Note(**self.note)
            if create:
                note.save()
            notes.append(note)
        return notes

    def test_root(self):
        self.login()

        resp = self.client.get(self.url('notes_api_root'))
        self.assertEqual(resp.status_code, 200)
        self.assertNotEqual(resp.content, '')

        content = json.loads(resp.content)

        self.assertEqual(set(('name', 'version')), set(content.keys()))
        self.assertIsInstance(content['version'], int)
        self.assertEqual(content['name'], 'Notes API')

    def test_index_empty(self):
        self.login()

        resp = self.client.get(self.url('notes_api_notes'))
        self.assertEqual(resp.status_code, 200)
        self.assertNotEqual(resp.content, '')

        content = json.loads(resp.content)
        self.assertEqual(len(content), 0)

    def test_index_with_notes(self):
        num_notes = 3
        self.login()
        self.create_notes(num_notes)

        resp = self.client.get(self.url('notes_api_notes'))
        self.assertEqual(resp.status_code, 200)
        self.assertNotEqual(resp.content, '')

        content = json.loads(resp.content)
        self.assertIsInstance(content, list)
        self.assertEqual(len(content), num_notes)

    def test_index_max_notes(self):
        self.login()

        MAX_LIMIT = api.API_SETTINGS.get('MAX_NOTE_LIMIT')
        num_notes = MAX_LIMIT + 1
        self.create_notes(num_notes)

        resp = self.client.get(self.url('notes_api_notes'))
        self.assertEqual(resp.status_code, 200)
        self.assertNotEqual(resp.content, '')

        content = json.loads(resp.content)
        self.assertIsInstance(content, list)
        self.assertEqual(len(content), MAX_LIMIT)

    def test_create_note(self):
        self.login()

        notes = self.create_notes(1)
        self.assertEqual(len(notes), 1)

        note_dict = notes[0].as_dict()
        excluded_fields = ['id', 'user_id', 'created', 'updated']
        note = dict([(k, v) for k, v in note_dict.items() if k not in excluded_fields])

        resp = self.client.post(self.url('notes_api_notes'),
                                json.dumps(note),
                                content_type='application/json',
                                HTTP_X_REQUESTED_WITH='XMLHttpRequest')

        self.assertEqual(resp.status_code, 303)
        self.assertEqual(len(resp.content), 0)

    def test_create_empty_notes(self):
        self.login()

        for empty_test in [None, [], '']:
            resp = self.client.post(self.url('notes_api_notes'),
                                    json.dumps(empty_test),
                                    content_type='application/json',
                                    HTTP_X_REQUESTED_WITH='XMLHttpRequest')
            self.assertEqual(resp.status_code, 400)

    def test_create_note_missing_ranges(self):
        self.login()

        notes = self.create_notes(1)
        self.assertEqual(len(notes), 1)
        note_dict = notes[0].as_dict()

        excluded_fields = ['id', 'user_id', 'created', 'updated'] + ['ranges']
        note = dict([(k, v) for k, v in note_dict.items() if k not in excluded_fields])

        resp = self.client.post(self.url('notes_api_notes'),
                                json.dumps(note),
                                content_type='application/json',
                                HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(resp.status_code, 400)

    def test_read_note(self):
        self.login()

        notes = self.create_notes(3)
        self.assertEqual(len(notes), 3)

        for note in notes:
            resp = self.client.get(self.url('notes_api_note', {'note_id': note.pk}))
            self.assertEqual(resp.status_code, 200)
            self.assertNotEqual(resp.content, '')

            content = json.loads(resp.content)
            self.assertEqual(content['id'], note.pk)
            self.assertEqual(content['user_id'], note.user_id)

    def test_note_doesnt_exist_to_read(self):
        self.login()
        resp = self.client.get(self.url('notes_api_note', {
            'note_id': self.NOTE_ID_DOES_NOT_EXIST
        }))
        self.assertEqual(resp.status_code, 404)
        self.assertEqual(resp.content, '')

    def test_student_doesnt_have_permission_to_read_note(self):
        notes = self.create_notes(1)
        self.assertEqual(len(notes), 1)
        note = notes[0]

        # set the student id to a different student (not the one that created the notes)
        self.login(as_student=self.student2)
        resp = self.client.get(self.url('notes_api_note', {'note_id': note.pk}))
        self.assertEqual(resp.status_code, 403)
        self.assertEqual(resp.content, '')

    def test_delete_note(self):
        self.login()

        notes = self.create_notes(1)
        self.assertEqual(len(notes), 1)
        note = notes[0]

        resp = self.client.delete(self.url('notes_api_note', {
            'note_id': note.pk
        }))
        self.assertEqual(resp.status_code, 204)
        self.assertEqual(resp.content, '')

        with self.assertRaises(models.Note.DoesNotExist):
            models.Note.objects.get(pk=note.pk)

    def test_note_does_not_exist_to_delete(self):
        self.login()

        resp = self.client.delete(self.url('notes_api_note', {
            'note_id': self.NOTE_ID_DOES_NOT_EXIST
        }))
        self.assertEqual(resp.status_code, 404)
        self.assertEqual(resp.content, '')

    def test_student_doesnt_have_permission_to_delete_note(self):
        notes = self.create_notes(1)
        self.assertEqual(len(notes), 1)
        note = notes[0]

        self.login(as_student=self.student2)
        resp = self.client.delete(self.url('notes_api_note', {
            'note_id': note.pk
        }))
        self.assertEqual(resp.status_code, 403)
        self.assertEqual(resp.content, '')

        try:
            models.Note.objects.get(pk=note.pk)
        except models.Note.DoesNotExist:
            self.fail('note should exist and not be deleted because the student does not have permission to do so')

    def test_update_note(self):
        notes = self.create_notes(1)
        note = notes[0]

        updated_dict = note.as_dict()
        updated_dict.update({
            'text': 'itchy and scratchy',
            'tags': ['simpsons', 'cartoons', 'animation']
        })

        self.login()
        resp = self.client.put(self.url('notes_api_note', {'note_id': note.pk}),
                               json.dumps(updated_dict),
                               content_type='application/json',
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
        self.assertEqual(resp.status_code, 303)
        self.assertEqual(resp.content, '')

        actual = models.Note.objects.get(pk=note.pk)
        actual_dict = actual.as_dict()
        for field in ['text', 'tags']:
            self.assertEqual(actual_dict[field], updated_dict[field])

    def test_search_note_params(self):
        self.login()

        total = 3
        notes = self.create_notes(total)
        invalid_uri = ''.join([note.uri for note in notes])

        tests = [{'limit': 0, 'offset': 0, 'expected_rows': total},
                 {'limit': 0, 'offset': 2, 'expected_rows': total - 2},
                 {'limit': 0, 'offset': total, 'expected_rows': 0},
                 {'limit': 1, 'offset': 0, 'expected_rows': 1},
                 {'limit': 2, 'offset': 0, 'expected_rows': 2},
                 {'limit': total, 'offset': 2, 'expected_rows': 1},
                 {'limit': total, 'offset': total, 'expected_rows': 0},
                 {'limit': total + 1, 'offset': total + 1, 'expected_rows': 0},
                 {'limit': total + 1, 'offset': 0, 'expected_rows': total},
                 {'limit': 0, 'offset': 0, 'uri': invalid_uri, 'expected_rows': 0, 'expected_total': 0}]

        for test in tests:
            params = dict([(k, str(test[k]))
                          for k in ('limit', 'offset', 'uri')
                          if k in test])
            resp = self.client.get(self.url('notes_api_search'),
                                   params,
                                   content_type='application/json',
                                   HTTP_X_REQUESTED_WITH='XMLHttpRequest')

            self.assertEqual(resp.status_code, 200)
            self.assertNotEqual(resp.content, '')

            content = json.loads(resp.content)

            for expected_key in ('total', 'rows'):
                self.assertIn(expected_key, content)

            if 'expected_total' in test:
                self.assertEqual(content['total'], test['expected_total'])
            else:
                self.assertEqual(content['total'], total)

            self.assertEqual(len(content['rows']), test['expected_rows'])

            for row in content['rows']:
                self.assertIn('id', row)


class NoteTest(TestCase):
    def setUp(self):
        super(NoteTest, self).setUp()

        self.password = 'abc'
        self.student = User.objects.create_user('student', 'student@test.com', self.password)
        self.course_key = SlashSeparatedCourseKey('HarvardX', 'CB22x', 'The_Ancient_Greek_Hero')
        self.note = {
            'user': self.student,
            'course_id': self.course_key,
            'uri': '/',
            'text': 'foo',
            'quote': 'bar',
            'range_start': 0,
            'range_start_offset': 0,
            'range_end': 100,
            'range_end_offset': 0,
            'tags': 'a,b,c'
        }

    def test_clean_valid_note(self):
        reference_note = models.Note(**self.note)
        body = reference_note.as_dict()

        note = models.Note(course_id=self.course_key, user=self.student)
        try:
            note.clean(json.dumps(body))
            self.assertEqual(note.uri, body['uri'])
            self.assertEqual(note.text, body['text'])
            self.assertEqual(note.quote, body['quote'])
            self.assertEqual(note.range_start, body['ranges'][0]['start'])
            self.assertEqual(note.range_start_offset, body['ranges'][0]['startOffset'])
            self.assertEqual(note.range_end, body['ranges'][0]['end'])
            self.assertEqual(note.range_end_offset, body['ranges'][0]['endOffset'])
            self.assertEqual(note.tags, ','.join(body['tags']))
        except ValidationError:
            self.fail('a valid note should not raise an exception')

    def test_clean_invalid_note(self):
        note = models.Note(course_id=self.course_key, user=self.student)
        for empty_type in (None, '', 0, []):
            with self.assertRaises(ValidationError):
                note.clean(None)

        with self.assertRaises(ValidationError):
            note.clean(json.dumps({
                'text': 'foo',
                'quote': 'bar',
                'ranges': [{} for __ in range(10)]  # too many ranges
            }))

    def test_as_dict(self):
        note = models.Note(course_id=self.course_key, user=self.student)
        d = note.as_dict()
        self.assertNotIsInstance(d, basestring)
        self.assertEqual(d['user_id'], self.student.id)
        self.assertNotIn('course_id', d)
