from django.db import connection

from django.db.models import CharField

from django.db.models.functions import MD5

from django.test import TestCase

from django.test.utils import register_lookup

from ..models import Author

class MD5Tests(TestCase):

    @classmethod

    def setUpTestData(cls):

        Author.objects.bulk_create(

            [

                Author(alias="John Smith"),

                Author(alias="Jordan Élena"),

                Author(alias="皇帝"),

                Author(alias=""),

                Author(alias=None),

            ]

        )

    def test_basic(self):

        authors = (

            Author.objects.annotate(

                md5_alias=MD5("alias"),

            )

            .values_list("md5_alias", flat=True)

            .order_by("pk")

        )

        self.assertSequenceEqual(

            authors,

            [

                "6117323d2cabbc17d44c2b44587f682c",

                "ca6d48f6772000141e66591aee49d56c",

                "bf2c13bc1154e3d2e7df848cbc8be73d",

                "d41d8cd98f00b204e9800998ecf8427e",

                "d41d8cd98f00b204e9800998ecf8427e"

                if connection.features.interprets_empty_strings_as_nulls

                else None,

            ],

        )

    def test_transform(self):

        with register_lookup(CharField, MD5):

            authors = Author.objects.filter(

                alias__md5="6117323d2cabbc17d44c2b44587f682c",

            ).values_list("alias", flat=True)

            self.assertSequenceEqual(authors, ["John Smith"])