from pathlib import Path
from unittest import mock

from django.conf import settings
from django.contrib.staticfiles.checks import check_finders
from django.contrib.staticfiles.finders import BaseFinder, get_finder
from django.core.checks import Error, Warning
from django.test import override_settings

from .cases import CollectionTestCase
from .settings import TEST_ROOT


class FindersCheckTests(CollectionTestCase):
    run_collectstatic_in_setUp = False

    def test_base_finder_check_not_implemented(self):
        finder = BaseFinder()
        msg = 'subclasses may provide a check() method to verify the finder is configured correctly.'
        with self.assertRaisesMessage(NotImplementedError, msg):
            finder.check()

    def test_check_finders(self):
        """check_finders() concatenates all errors."""
        error1 = Error('1')
        error2 = Error('2')
        error3 = Error('3')

        def get_finders():
            class Finder1(BaseFinder):
                def check(self, **kwargs):
                    return [error1]

            class Finder2(BaseFinder):
                def check(self, **kwargs):
                    return []

            class Finder3(BaseFinder):
                def check(self, **kwargs):
                    return [error2, error3]

            class Finder4(BaseFinder):
                pass

            return [Finder1(), Finder2(), Finder3(), Finder4()]

        with mock.patch('django.contrib.staticfiles.checks.get_finders', get_finders):
            errors = check_finders(None)
            self.assertEqual(errors, [error1, error2, error3])

    def test_no_errors_with_test_settings(self):
        self.assertEqual(check_finders(None), [])

    @override_settings(STATICFILES_DIRS='a string')
    def test_dirs_not_tuple_or_list(self):
        self.assertEqual(check_finders(None), [
            Error(
                'The STATICFILES_DIRS setting is not a tuple or list.',
                hint='Perhaps you forgot a trailing comma?',
                id='staticfiles.E001',
            )
        ])

    def test_dirs_contains_static_root(self):
        with self.settings(STATICFILES_DIRS=[settings.STATIC_ROOT]):
            self.assertEqual(check_finders(None), [
                Error(
                    'The STATICFILES_DIRS setting should not contain the '
                    'STATIC_ROOT setting.',
                    id='staticfiles.E002',
                )
            ])

    def test_dirs_contains_static_root_in_tuple(self):
        with self.settings(STATICFILES_DIRS=[('prefix', settings.STATIC_ROOT)]):
            self.assertEqual(check_finders(None), [
                Error(
                    'The STATICFILES_DIRS setting should not contain the '
                    'STATIC_ROOT setting.',
                    id='staticfiles.E002',
                )
            ])

    def test_prefix_contains_trailing_slash(self):
        static_dir = Path(TEST_ROOT) / 'project' / 'documents'
        with self.settings(STATICFILES_DIRS=[('prefix/', static_dir)]):
            self.assertEqual(check_finders(None), [
                Error(
                    "The prefix 'prefix/' in the STATICFILES_DIRS setting must "
                    "not end with a slash.",
                    id='staticfiles.E003',
                ),
            ])

    def test_nonexistent_directories(self):
        with self.settings(STATICFILES_DIRS=[
            '/fake/path',
            ('prefix', '/fake/prefixed/path'),
        ]):
            self.assertEqual(check_finders(None), [
                Warning(
                    "The directory '/fake/path' in the STATICFILES_DIRS "
                    "setting does not exist.",
                    id='staticfiles.W004',
                ),
                Warning(
                    "The directory '/fake/prefixed/path' in the "
                    "STATICFILES_DIRS setting does not exist.",
                    id='staticfiles.W004',
                ),
            ])
            # Nonexistent directories are skipped.
            finder = get_finder('django.contrib.staticfiles.finders.FileSystemFinder')
            self.assertEqual(list(finder.list(None)), [])
