''' testing models '''
from io import BytesIO
from collections import namedtuple
import pathlib
import re

from PIL import Image
import responses

from django.core.exceptions import ValidationError
from django.core.files.base import ContentFile
from django.db import models
from django.test import TestCase
from django.utils import timezone

from bookwyrm.models import fields, User
from bookwyrm.settings import DOMAIN

class ActivitypubFields(TestCase):
    def test_validate_remote_id(self):
        self.assertIsNone(fields.validate_remote_id(
            'http://www.example.com'
        ))
        self.assertIsNone(fields.validate_remote_id(
            'https://www.example.com'
        ))
        self.assertIsNone(fields.validate_remote_id(
            'http://example.com/dlfjg-23/x'
        ))
        self.assertRaises(
            ValidationError, fields.validate_remote_id,
            'http:/example.com/dlfjg-23/x'
        )
        self.assertRaises(
            ValidationError, fields.validate_remote_id,
            'www.example.com/dlfjg-23/x'
        )
        self.assertRaises(
            ValidationError, fields.validate_remote_id,
            'http://www.example.com/dlfjg 23/x'
        )

    def test_activitypub_field_mixin(self):
        instance = fields.ActivitypubFieldMixin()
        self.assertEqual(instance.field_to_activity('fish'), 'fish')
        self.assertEqual(instance.field_from_activity('fish'), 'fish')

        instance = fields.ActivitypubFieldMixin(
            activitypub_wrapper='endpoints', activitypub_field='outbox'
        )
        self.assertEqual(
            instance.field_to_activity('fish'),
            {'outbox': 'fish'}
        )
        self.assertEqual(
            instance.field_from_activity({'outbox': 'fish'}),
            'fish'
        )
        self.assertEqual(instance.get_activitypub_field(), 'endpoints')

        instance = fields.ActivitypubFieldMixin()
        instance.name = 'snake_case_name'
        self.assertEqual(instance.get_activitypub_field(), 'snakeCaseName')

    def test_remote_id_field(self):
        instance = fields.RemoteIdField()
        self.assertEqual(instance.max_length, 255)

        with self.assertRaises(ValidationError):
            instance.run_validators('http://www.example.com/dlfjg 23/x')

    def test_username_field(self):
        instance = fields.UsernameField()
        self.assertEqual(instance.activitypub_field, 'preferredUsername')
        self.assertEqual(instance.max_length, 150)
        self.assertEqual(instance.unique, True)
        with self.assertRaises(ValidationError):
            instance.run_validators('one two')
            instance.run_validators('a*&')
            instance.run_validators('trailingwhite ')
        self.assertIsNone(instance.run_validators('aksdhf'))

        self.assertEqual(instance.field_to_activity('test@example.com'), 'test')

    def test_foreign_key(self):
        instance = fields.ForeignKey('User', on_delete=models.CASCADE)
        Serializable = namedtuple('Serializable', ('to_activity', 'remote_id'))
        item = Serializable(lambda: {'a': 'b'}, 'https://e.b/c')
        self.assertEqual(instance.field_to_activity(item), 'https://e.b/c')

    def test_one_to_one_field(self):
        instance = fields.OneToOneField('User', on_delete=models.CASCADE)
        Serializable = namedtuple('Serializable', ('to_activity', 'remote_id'))
        item = Serializable(lambda: {'a': 'b'}, 'https://e.b/c')
        self.assertEqual(instance.field_to_activity(item), {'a': 'b'})

    def test_many_to_many_field(self):
        instance = fields.ManyToManyField('User')

        Serializable = namedtuple('Serializable', ('to_activity', 'remote_id'))
        Queryset = namedtuple('Queryset', ('all', 'instance'))
        item = Serializable(lambda: {'a': 'b'}, 'https://e.b/c')
        another_item = Serializable(lambda: {}, 'example.com')

        items = Queryset(lambda: [item], another_item)

        self.assertEqual(instance.field_to_activity(items), ['https://e.b/c'])

        instance = fields.ManyToManyField('User', link_only=True)
        instance.name = 'snake_case'
        self.assertEqual(
            instance.field_to_activity(items),
            'example.com/snake_case'
        )

    def test_tag_field(self):
        instance = fields.TagField('User')

        Serializable = namedtuple(
            'Serializable',
            ('to_activity', 'remote_id', 'name_field', 'name')
        )
        Queryset = namedtuple('Queryset', ('all', 'instance'))
        item = Serializable(
            lambda: {'a': 'b'}, 'https://e.b/c', 'name', 'Name')
        another_item = Serializable(
            lambda: {}, 'example.com', '', '')
        items = Queryset(lambda: [item], another_item)

        result = instance.field_to_activity(items)
        self.assertIsInstance(result, list)
        self.assertEqual(len(result), 1)
        self.assertEqual(result[0].href, 'https://e.b/c')
        self.assertEqual(result[0].name, 'Name')
        self.assertEqual(result[0].type, 'Serializable')


    @responses.activate
    def test_image_field(self):
        user = User.objects.create_user(
            'mouse', 'mouse@mouse.mouse', 'mouseword', local=True)
        image_file = pathlib.Path(__file__).parent.joinpath(
            '../../static/images/default_avi.jpg')
        image = Image.open(image_file)
        output = BytesIO()
        image.save(output, format=image.format)
        user.avatar.save(
            'test.jpg',
            ContentFile(output.getvalue())
        )

        output = fields.image_serializer(user.avatar)
        self.assertIsNotNone(
            re.match(
                r'https://%s/images/avatars/test_.*\.jpg' % DOMAIN,
                output.url,
            )
        )
        self.assertEqual(output.type, 'Image')

        instance = fields.ImageField()

        self.assertEqual(instance.field_to_activity(user.avatar), output)

        responses.add(
            responses.GET,
            'http://www.example.com/image.jpg',
            body=user.avatar.file.read(),
            status=200)
        loaded_image = instance.field_from_activity(
            'http://www.example.com/image.jpg')
        self.assertIsInstance(loaded_image, list)
        self.assertIsNotNone(re.match(r'.*\.jpg', loaded_image[0]))
        self.assertIsInstance(loaded_image[1], ContentFile)


    def test_datetime_field(self):
        instance = fields.DateTimeField()
        now = timezone.now()
        self.assertEqual(instance.field_to_activity(now), now.isoformat())
        self.assertEqual(
            instance.field_from_activity(now.isoformat()), now
        )
        self.assertEqual(instance.field_from_activity('bip'), None)


    def test_array_field(self):
        instance = fields.ArrayField(fields.IntegerField)
        self.assertEqual(instance.field_to_activity([0, 1]), ['0', '1'])