from django.db import models
from django.test import SimpleTestCase
from django.test.utils import isolate_apps


@isolate_apps('absolute_url_overrides')
class AbsoluteUrlOverrideTests(SimpleTestCase):

    def test_get_absolute_url(self):
        """
        get_absolute_url() functions as a normal method.
        """
        def get_absolute_url(o):
            return '/test-a/%s/' % o.pk
        TestA = self._create_model_class('TestA', get_absolute_url)

        self.assertTrue(hasattr(TestA, 'get_absolute_url'))
        obj = TestA(pk=1, name='Foo')
        self.assertEqual('/test-a/%s/' % obj.pk, obj.get_absolute_url())

    def test_override_get_absolute_url(self):
        """
        ABSOLUTE_URL_OVERRIDES should override get_absolute_url().
        """
        def get_absolute_url(o):
            return '/test-b/%s/' % o.pk
        with self.settings(
            ABSOLUTE_URL_OVERRIDES={
                'absolute_url_overrides.testb': lambda o: '/overridden-test-b/%s/' % o.pk,
            },
        ):
            TestB = self._create_model_class('TestB', get_absolute_url)
            obj = TestB(pk=1, name='Foo')
            self.assertEqual('/overridden-test-b/%s/' % obj.pk, obj.get_absolute_url())

    def test_insert_get_absolute_url(self):
        """
        ABSOLUTE_URL_OVERRIDES should work even if the model doesn't have a
        get_absolute_url() method.
        """
        with self.settings(
            ABSOLUTE_URL_OVERRIDES={
                'absolute_url_overrides.testc': lambda o: '/test-c/%s/' % o.pk,
            },
        ):
            TestC = self._create_model_class('TestC')
            obj = TestC(pk=1, name='Foo')
            self.assertEqual('/test-c/%s/' % obj.pk, obj.get_absolute_url())

    def _create_model_class(self, class_name, get_absolute_url_method=None):
        attrs = {
            'name': models.CharField(max_length=50),
            '__module__': 'absolute_url_overrides',
        }
        if get_absolute_url_method:
            attrs['get_absolute_url'] = get_absolute_url_method

        return type(class_name, (models.Model,), attrs)