from django.db import connection

from django.db.models import CharField

from django.db.models.functions import SHA256

from django.test import TestCase

from django.test.utils import register_lookup

from ..models import Author

class SHA256Tests(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(

                sha256_alias=SHA256("alias"),

            )

            .values_list("sha256_alias", flat=True)

            .order_by("pk")

        )

        self.assertSequenceEqual(

            authors,

            [

                "ef61a579c907bbed674c0dbcbcf7f7af8f851538eef7b8e58c5bee0b8cfdac4a",

                "6e4cce20cd83fc7c202f21a8b2452a68509cf24d1c272a045b5e0cfc43f0d94e",

                "3ad2039e3ec0c88973ae1c0fce5a3dbafdd5a1627da0a92312c54ebfcf43988e",

                "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",

                "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"

                if connection.features.interprets_empty_strings_as_nulls

                else None,

            ],

        )

    def test_transform(self):

        with register_lookup(CharField, SHA256):

            authors = Author.objects.filter(

                alias__sha256=(

                    "ef61a579c907bbed674c0dbcbcf7f7af8f851538eef7b8e58c5bee0b8cfdac4a"

                ),

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

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