from copy import copy, deepcopy

from django.core.checks import Error
from django.core.checks.templates import (
    E001, E002, E003, check_for_template_tags_with_the_same_name,
    check_setting_app_dirs_loaders, check_string_if_invalid_is_string,
)
from django.test import SimpleTestCase
from django.test.utils import override_settings


class CheckTemplateSettingsAppDirsTest(SimpleTestCase):
    TEMPLATES_APP_DIRS_AND_LOADERS = [
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'APP_DIRS': True,
            'OPTIONS': {
                'loaders': ['django.template.loaders.filesystem.Loader'],
            },
        },
    ]

    @override_settings(TEMPLATES=TEMPLATES_APP_DIRS_AND_LOADERS)
    def test_app_dirs_and_loaders(self):
        """
        Error if template loaders are specified and APP_DIRS is True.
        """
        self.assertEqual(check_setting_app_dirs_loaders(None), [E001])

    def test_app_dirs_removed(self):
        TEMPLATES = deepcopy(self.TEMPLATES_APP_DIRS_AND_LOADERS)
        del TEMPLATES[0]['APP_DIRS']
        with self.settings(TEMPLATES=TEMPLATES):
            self.assertEqual(check_setting_app_dirs_loaders(None), [])

    def test_loaders_removed(self):
        TEMPLATES = deepcopy(self.TEMPLATES_APP_DIRS_AND_LOADERS)
        del TEMPLATES[0]['OPTIONS']['loaders']
        with self.settings(TEMPLATES=TEMPLATES):
            self.assertEqual(check_setting_app_dirs_loaders(None), [])


class CheckTemplateStringIfInvalidTest(SimpleTestCase):
    TEMPLATES_STRING_IF_INVALID = [
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'OPTIONS': {
                'string_if_invalid': False,
            },
        },
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'OPTIONS': {
                'string_if_invalid': 42,
            },
        },
    ]

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.error1 = copy(E002)
        cls.error2 = copy(E002)
        string_if_invalid1 = cls.TEMPLATES_STRING_IF_INVALID[0]['OPTIONS']['string_if_invalid']
        string_if_invalid2 = cls.TEMPLATES_STRING_IF_INVALID[1]['OPTIONS']['string_if_invalid']
        cls.error1.msg = cls.error1.msg.format(string_if_invalid1, type(string_if_invalid1).__name__)
        cls.error2.msg = cls.error2.msg.format(string_if_invalid2, type(string_if_invalid2).__name__)

    @override_settings(TEMPLATES=TEMPLATES_STRING_IF_INVALID)
    def test_string_if_invalid_not_string(self):
        self.assertEqual(check_string_if_invalid_is_string(None), [self.error1, self.error2])

    def test_string_if_invalid_first_is_string(self):
        TEMPLATES = deepcopy(self.TEMPLATES_STRING_IF_INVALID)
        TEMPLATES[0]['OPTIONS']['string_if_invalid'] = 'test'
        with self.settings(TEMPLATES=TEMPLATES):
            self.assertEqual(check_string_if_invalid_is_string(None), [self.error2])

    def test_string_if_invalid_both_are_strings(self):
        TEMPLATES = deepcopy(self.TEMPLATES_STRING_IF_INVALID)
        TEMPLATES[0]['OPTIONS']['string_if_invalid'] = 'test'
        TEMPLATES[1]['OPTIONS']['string_if_invalid'] = 'test'
        with self.settings(TEMPLATES=TEMPLATES):
            self.assertEqual(check_string_if_invalid_is_string(None), [])

    def test_string_if_invalid_not_specified(self):
        TEMPLATES = deepcopy(self.TEMPLATES_STRING_IF_INVALID)
        del TEMPLATES[1]['OPTIONS']['string_if_invalid']
        with self.settings(TEMPLATES=TEMPLATES):
            self.assertEqual(check_string_if_invalid_is_string(None), [self.error1])


class CheckTemplateTagLibrariesWithSameName(SimpleTestCase):
    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        cls.error_same_tags = Error(
            E003.msg.format(
                "'same_tags'",
                "'check_framework.template_test_apps.same_tags_app_1."
                "templatetags.same_tags', "
                "'check_framework.template_test_apps.same_tags_app_2."
                "templatetags.same_tags'",
            ),
            id=E003.id,
        )

    @staticmethod
    def get_settings(module_name, module_path):
        return {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'OPTIONS': {
                'libraries': {
                    module_name: f'check_framework.template_test_apps.{module_path}',
                },
            },
        }

    @override_settings(INSTALLED_APPS=[
        'check_framework.template_test_apps.same_tags_app_1',
        'check_framework.template_test_apps.same_tags_app_2',
    ])
    def test_template_tags_with_same_name(self):
        self.assertEqual(
            check_for_template_tags_with_the_same_name(None),
            [self.error_same_tags],
        )

    def test_template_tags_with_same_library_name(self):
        with self.settings(TEMPLATES=[
            self.get_settings('same_tags', 'same_tags_app_1.templatetags.same_tags'),
            self.get_settings('same_tags', 'same_tags_app_2.templatetags.same_tags'),
        ]):
            self.assertEqual(
                check_for_template_tags_with_the_same_name(None),
                [self.error_same_tags],
            )

    @override_settings(INSTALLED_APPS=[
        'check_framework.template_test_apps.same_tags_app_1'
    ])
    def test_template_tags_with_same_library_name_and_module_name(self):
        with self.settings(TEMPLATES=[
            self.get_settings(
                'same_tags',
                'different_tags_app.templatetags.different_tags',
            ),
        ]):
            self.assertEqual(check_for_template_tags_with_the_same_name(None), [Error(
                E003.msg.format(
                    "'same_tags'",
                    "'check_framework.template_test_apps.different_tags_app."
                    "templatetags.different_tags', "
                    "'check_framework.template_test_apps.same_tags_app_1."
                    "templatetags.same_tags'",
                ),
                id=E003.id,
            )])

    def test_template_tags_with_different_library_name(self):
        with self.settings(TEMPLATES=[
            self.get_settings('same_tags', 'same_tags_app_1.templatetags.same_tags'),
            self.get_settings('not_same_tags', 'same_tags_app_2.templatetags.same_tags'),
        ]):
            self.assertEqual(check_for_template_tags_with_the_same_name(None), [])

    @override_settings(INSTALLED_APPS=[
        'check_framework.template_test_apps.same_tags_app_1',
        'check_framework.template_test_apps.different_tags_app',
    ])
    def test_template_tags_with_different_name(self):
        self.assertEqual(check_for_template_tags_with_the_same_name(None), [])