from django.db import connection
from django.db.models import CharField
from django.db.models.functions import SHA1
from django.test import TestCase
from django.test.utils import register_lookup

from ..models import Author


class SHA1Tests(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(
            sha1_alias=SHA1('alias'),
        ).values_list('sha1_alias', flat=True).order_by('pk')
        self.assertSequenceEqual(
            authors,
            [
                'e61a3587b3f7a142b8c7b9263c82f8119398ecb7',
                '0781e0745a2503e6ded05ed5bc554c421d781b0c',
                '198d15ea139de04060caf95bc3e0ec5883cba881',
                'da39a3ee5e6b4b0d3255bfef95601890afd80709',
                'da39a3ee5e6b4b0d3255bfef95601890afd80709'
                if connection.features.interprets_empty_strings_as_nulls else None,
            ],
        )

    def test_transform(self):
        with register_lookup(CharField, SHA1):
            authors = Author.objects.filter(
                alias__sha1='e61a3587b3f7a142b8c7b9263c82f8119398ecb7',
            ).values_list('alias', flat=True)
            self.assertSequenceEqual(authors, ['John Smith'])