from unittest.mock import patch
from django.test import SimpleTestCase, override_settings
from django.urls import NoReverseMatch

from ..views import RootView


class DummyModuleMeta:
    def __init__(self, package, url_namespace=None):
        self.package = package
        self.url_namespace = url_namespace

    @property
    def url_name(self):
        if self.url_namespace:
            return self.url_namespace + ':root'
        else:
            return 'root'

class DummyModuleConfig:
    def __init__(self, modules):
        # modules: dict-like mapping name -> DummyMeta
        self._modules = modules

    @property
    def modules(self):
        return self._modules


class ViewsTestCase(SimpleTestCase):
    def test_root(self):
        modules = {
            'module1': DummyModuleMeta('pkg1', url_namespace='ns1'),
            'module2': DummyModuleMeta('pkg2'),
            'moduleC': DummyModuleMeta('pkgC', url_namespace='nsC'),
            'moduleD': DummyModuleMeta('pkgD', url_namespace='nsD'),
        }
        expected_root_urls = [
            ('pkg1', 'ns1:root'), ('pkg2', 'root'), ('pkgD', 'nsD:root')
        ]

        def fake_reverse(name):
            if name == 'nsC:root':
                raise NoReverseMatch()
            return '/'

        with override_settings(MODULE_CONFIG=DummyModuleConfig(modules)):
            with patch('dav_base.views.reverse', side_effect=fake_reverse) as mocked_reverse:
                view = RootView()
                template_names = view.get_template_names()
                self.assertEqual(len(template_names), 1)
                self.assertIn('dav_base/root.html', template_names)
                context = view.get_context_data()
                self.assertIn('root_urls', context)
                self.assertIsInstance(context['root_urls'], list)
                self.assertEqual(context['root_urls'], expected_root_urls)
                called_names = [call.args[0] for call in mocked_reverse.call_args_list]
                self.assertEqual(len(called_names), len(modules))
                for m in modules.values():
                    self.assertIn(m.url_name, called_names)

    def test_integrated_root(self):
        with override_settings(MODULE_CONFIG=DummyModuleConfig({})):
            response = self.client.get('/')
            self.assertTemplateUsed(response, 'dav_base/root.html')
            self.assertIn('root_urls', response.context, '\'root_urls\' not in context of root view')
            self.assertIsInstance(response.context['root_urls'], list)
            self.assertEqual(response.context['root_urls'], [])