import datetime
from collections.abc import Iterator
from unittest import mock

from xsdata import __version__
from xsdata.codegen.exceptions import CodegenError
from xsdata.codegen.models import Class
from xsdata.formats.mixins import AbstractGenerator, GeneratorResult
from xsdata.models.config import GeneratorConfig
from xsdata.utils.testing import ClassFactory, FactoryTestCase


class NoneGenerator(AbstractGenerator):
    def render(self, classes: list[Class]) -> Iterator[GeneratorResult]:
        """Do nothing."""


class AbstractGeneratorTests(FactoryTestCase):
    def setUp(self) -> None:
        config = GeneratorConfig()
        self.generator = NoneGenerator(config)
        super().setUp()

    def test_module_name(self) -> None:
        self.assertEqual("a", self.generator.module_name("a"))

    def test_package_name(self) -> None:
        self.assertEqual("a", self.generator.package_name("a"))

    @mock.patch.object(NoneGenerator, "module_name", return_value="mod")
    @mock.patch.object(NoneGenerator, "package_name", return_value="pck")
    def test_normalize_packages(self, *args) -> None:
        classes = [
            ClassFactory.create(qname="{a}a", package="bar", module="mod"),
            ClassFactory.create(qname="{a}b", package="bar", module="mod"),
            ClassFactory.create(qname="b", package="bar", module="mod"),
        ]

        self.generator.normalize_packages(classes)
        self.assertEqual("pck", classes[0].package)
        self.assertEqual("pck", classes[1].package)
        self.assertEqual("pck", classes[2].package)

        self.assertEqual("mod", classes[0].module)
        self.assertEqual("mod", classes[1].module)
        self.assertEqual("mod", classes[2].module)

        with self.assertRaises(CodegenError):
            self.generator.normalize_packages(ClassFactory.list(1))

    @mock.patch("datetime.datetime", wraps=datetime.datetime)
    def test_render_header(self, mock_datetime) -> None:
        actual = self.generator.render_header()
        self.assertEqual("", actual)
        mock_datetime.now.return_value = datetime.datetime(
            year=2023, month=2, day=22, hour=10, minute=20, second=25
        )

        self.generator.config.output.include_header = True
        actual = self.generator.render_header()
        now_iso_format = "2023-02-22 10:20:25"
        expected = (
            f'"""This file was generated by xsdata, v{__version__}, on {now_iso_format}\n'
            "\n"
            "Generator: NoneGenerator\n"
            "See: https://xsdata.readthedocs.io/\n"
            '"""\n'
        )

        self.assertEqual(expected, actual)