import unittest

import django
from django.contrib.auth.models import User
from django.http import HttpRequest
from django.test import override_settings
from django.urls import include, path

from rest_framework import status
from rest_framework.authentication import TokenAuthentication
from rest_framework.authtoken.models import Token
from rest_framework.decorators import action, api_view
from rest_framework.request import is_form_media_type
from rest_framework.response import Response
from rest_framework.routers import SimpleRouter
from rest_framework.test import APITestCase
from rest_framework.views import APIView
from rest_framework.viewsets import GenericViewSet


class PostView(APIView):
    def post(self, request):
        return Response(data=request.data, status=200)


class GetAPIView(APIView):
    def get(self, request):
        return Response(data="OK", status=200)


@api_view(['GET'])
def get_func_view(request):
    return Response(data="OK", status=200)


class ListViewSet(GenericViewSet):

    def list(self, request, *args, **kwargs):
        response = Response()
        response.view = self
        return response

    @action(detail=False, url_path='list-action')
    def list_action(self, request, *args, **kwargs):
        response = Response()
        response.view = self
        return response


router = SimpleRouter()
router.register(r'view-set', ListViewSet, basename='view_set')

urlpatterns = [
    path('auth', APIView.as_view(authentication_classes=(TokenAuthentication,))),
    path('post', PostView.as_view()),
    path('get', GetAPIView.as_view()),
    path('get-func', get_func_view),
    path('api/', include(router.urls)),
]


class RequestUserMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        response = self.get_response(request)
        assert hasattr(request, 'user'), '`user` is not set on request'
        assert request.user.is_authenticated, '`user` is not authenticated'

        return response


class RequestPOSTMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        assert isinstance(request, HttpRequest)

        # Parse body with underlying Django request
        request.body

        # Process request with DRF view
        response = self.get_response(request)

        # Ensure request.POST is set as appropriate
        if is_form_media_type(request.content_type):
            assert request.POST == {'foo': ['bar']}
        else:
            assert request.POST == {}

        return response


@override_settings(ROOT_URLCONF='tests.test_middleware')
class TestMiddleware(APITestCase):

    @override_settings(MIDDLEWARE=('tests.test_middleware.RequestUserMiddleware',))
    def test_middleware_can_access_user_when_processing_response(self):
        user = User.objects.create_user('john', 'john@example.com', 'password')
        key = 'abcd1234'
        Token.objects.create(key=key, user=user)

        self.client.get('/auth', HTTP_AUTHORIZATION='Token %s' % key)

    @override_settings(MIDDLEWARE=('tests.test_middleware.RequestPOSTMiddleware',))
    def test_middleware_can_access_request_post_when_processing_response(self):
        response = self.client.post('/post', {'foo': 'bar'})
        assert response.status_code == 200

        response = self.client.post('/post', {'foo': 'bar'}, format='json')
        assert response.status_code == 200


@unittest.skipUnless(django.VERSION >= (5, 1), 'Only for Django 5.1+')
@override_settings(
    ROOT_URLCONF='tests.test_middleware',
    MIDDLEWARE=(
        # Needed for AuthenticationMiddleware
        'django.contrib.sessions.middleware.SessionMiddleware',
        # Needed for LoginRequiredMiddleware
        'django.contrib.auth.middleware.AuthenticationMiddleware',
        'django.contrib.auth.middleware.LoginRequiredMiddleware',
    ),
)
class TestLoginRequiredMiddlewareCompat(APITestCase):
    """
    Django's 5.1+ LoginRequiredMiddleware should NOT apply to DRF views.

    Instead, users should put IsAuthenticated in their
    DEFAULT_PERMISSION_CLASSES setting.
    """
    def test_class_based_view(self):
        response = self.client.get('/get')
        assert response.status_code == status.HTTP_200_OK

    def test_function_based_view(self):
        response = self.client.get('/get-func')
        assert response.status_code == status.HTTP_200_OK

    def test_viewset_list(self):
        response = self.client.get('/api/view-set/')
        assert response.status_code == status.HTTP_200_OK

    def test_viewset_list_action(self):
        response = self.client.get('/api/view-set/list-action/')
        assert response.status_code == status.HTTP_200_OK