import unittest

from django.db import NotSupportedError, connection

from django.db.models import CharField

from django.db.models.functions import SHA224

from django.test import TestCase

from django.test.utils import register_lookup

from ..models import Author

class SHA224Tests(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(

                sha224_alias=SHA224("alias"),

            )

            .values_list("sha224_alias", flat=True)

            .order_by("pk")

        )

        self.assertSequenceEqual(

            authors,

            [

                "a61303c220731168452cb6acf3759438b1523e768f464e3704e12f70",

                "2297904883e78183cb118fc3dc21a610d60daada7b6ebdbc85139f4d",

                "eba942746e5855121d9d8f79e27dfdebed81adc85b6bf41591203080",

                "d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f",

                "d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f"

                if connection.features.interprets_empty_strings_as_nulls

                else None,

            ],

        )

    def test_transform(self):

        with register_lookup(CharField, SHA224):

            authors = Author.objects.filter(

                alias__sha224=(

                    "a61303c220731168452cb6acf3759438b1523e768f464e3704e12f70"

                ),

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

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

    @unittest.skipUnless(

        connection.vendor == "oracle", "Oracle doesn't support SHA224."

    )

    def test_unsupported(self):

        msg = "SHA224 is not supported on Oracle."

        with self.assertRaisesMessage(NotSupportedError, msg):

            Author.objects.annotate(sha224_alias=SHA224("alias")).first()