"""
Tests for content parsing, and form-overloaded content parsing.
"""
from __future__ import unicode_literals

import os.path
import tempfile

from django.conf.urls import url
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.models import User
from django.contrib.sessions.middleware import SessionMiddleware
from django.core.files.uploadedfile import SimpleUploadedFile
from django.test import TestCase, override_settings
from django.utils import six

from rest_framework import status
from rest_framework.authentication import SessionAuthentication
from rest_framework.parsers import BaseParser, FormParser, MultiPartParser
from rest_framework.request import Request
from rest_framework.response import Response
from rest_framework.test import APIClient, APIRequestFactory
from rest_framework.views import APIView

factory = APIRequestFactory()


class PlainTextParser(BaseParser):
    media_type = 'text/plain'

    def parse(self, stream, media_type=None, parser_context=None):
        """
        Returns a 2-tuple of `(data, files)`.

        `data` will simply be a string representing the body of the request.
        `files` will always be `None`.
        """
        return stream.read()


class TestContentParsing(TestCase):
    def test_standard_behaviour_determines_no_content_GET(self):
        """
        Ensure request.data returns empty QueryDict for GET request.
        """
        request = Request(factory.get('/'))
        assert request.data == {}

    def test_standard_behaviour_determines_no_content_HEAD(self):
        """
        Ensure request.data returns empty QueryDict for HEAD request.
        """
        request = Request(factory.head('/'))
        assert request.data == {}

    def test_request_DATA_with_form_content(self):
        """
        Ensure request.data returns content for POST request with form content.
        """
        data = {'qwerty': 'uiop'}
        request = Request(factory.post('/', data))
        request.parsers = (FormParser(), MultiPartParser())
        assert list(request.data.items()) == list(data.items())

    def test_request_DATA_with_text_content(self):
        """
        Ensure request.data returns content for POST request with
        non-form content.
        """
        content = six.b('qwerty')
        content_type = 'text/plain'
        request = Request(factory.post('/', content, content_type=content_type))
        request.parsers = (PlainTextParser(),)
        assert request.data == content

    def test_request_POST_with_form_content(self):
        """
        Ensure request.POST returns content for POST request with form content.
        """
        data = {'qwerty': 'uiop'}
        request = Request(factory.post('/', data))
        request.parsers = (FormParser(), MultiPartParser())
        assert list(request.POST.items()) == list(data.items())

    def test_request_POST_with_files(self):
        """
        Ensure request.POST returns no content for POST request with file content.
        """
        upload = SimpleUploadedFile("file.txt", b"file_content")
        request = Request(factory.post('/', {'upload': upload}))
        request.parsers = (FormParser(), MultiPartParser())
        assert list(request.POST.keys()) == []
        assert list(request.FILES.keys()) == ['upload']

    def test_standard_behaviour_determines_form_content_PUT(self):
        """
        Ensure request.data returns content for PUT request with form content.
        """
        data = {'qwerty': 'uiop'}
        request = Request(factory.put('/', data))
        request.parsers = (FormParser(), MultiPartParser())
        assert list(request.data.items()) == list(data.items())

    def test_standard_behaviour_determines_non_form_content_PUT(self):
        """
        Ensure request.data returns content for PUT request with
        non-form content.
        """
        content = six.b('qwerty')
        content_type = 'text/plain'
        request = Request(factory.put('/', content, content_type=content_type))
        request.parsers = (PlainTextParser(), )
        assert request.data == content


class MockView(APIView):
    authentication_classes = (SessionAuthentication,)

    def post(self, request):
        if request.POST.get('example') is not None:
            return Response(status=status.HTTP_200_OK)

        return Response(status=status.HTTP_500_INTERNAL_SERVER_ERROR)


class FileUploadView(APIView):
    def post(self, request):
        filenames = [file.temporary_file_path() for file in request.FILES.values()]

        for filename in filenames:
            assert os.path.exists(filename)

        return Response(status=status.HTTP_200_OK, data=filenames)


urlpatterns = [
    url(r'^$', MockView.as_view()),
    url(r'^upload/$', FileUploadView.as_view())
]


@override_settings(
    ROOT_URLCONF='tests.test_request',
    FILE_UPLOAD_HANDLERS=['django.core.files.uploadhandler.TemporaryFileUploadHandler'])
class FileUploadTests(TestCase):

    def test_fileuploads_closed_at_request_end(self):
        with tempfile.NamedTemporaryFile() as f:
            response = self.client.post('/upload/', {'file': f})

        # sanity check that file was processed
        assert len(response.data) == 1

        for file in response.data:
            assert not os.path.exists(file)


@override_settings(ROOT_URLCONF='tests.test_request')
class TestContentParsingWithAuthentication(TestCase):
    def setUp(self):
        self.csrf_client = APIClient(enforce_csrf_checks=True)
        self.username = 'john'
        self.email = 'lennon@thebeatles.com'
        self.password = 'password'
        self.user = User.objects.create_user(self.username, self.email, self.password)

    def test_user_logged_in_authentication_has_POST_when_not_logged_in(self):
        """
        Ensures request.POST exists after SessionAuthentication when user
        doesn't log in.
        """
        content = {'example': 'example'}

        response = self.client.post('/', content)
        assert status.HTTP_200_OK == response.status_code

        response = self.csrf_client.post('/', content)
        assert status.HTTP_200_OK == response.status_code


class TestUserSetter(TestCase):

    def setUp(self):
        # Pass request object through session middleware so session is
        # available to login and logout functions
        self.wrapped_request = factory.get('/')
        self.request = Request(self.wrapped_request)
        SessionMiddleware().process_request(self.request)

        User.objects.create_user('ringo', 'starr@thebeatles.com', 'yellow')
        self.user = authenticate(username='ringo', password='yellow')

    def test_user_can_be_set(self):
        self.request.user = self.user
        assert self.request.user == self.user

    def test_user_can_login(self):
        login(self.request, self.user)
        assert self.request.user == self.user

    def test_user_can_logout(self):
        self.request.user = self.user
        self.assertFalse(self.request.user.is_anonymous)
        logout(self.request)
        self.assertTrue(self.request.user.is_anonymous)

    def test_logged_in_user_is_set_on_wrapped_request(self):
        login(self.request, self.user)
        assert self.wrapped_request.user == self.user

    def test_calling_user_fails_when_attribute_error_is_raised(self):
        """
        This proves that when an AttributeError is raised inside of the request.user
        property, that we can handle this and report the true, underlying error.
        """
        class AuthRaisesAttributeError(object):
            def authenticate(self, request):
                import rest_framework
                rest_framework.MISSPELLED_NAME_THAT_DOESNT_EXIST

        self.request = Request(factory.get('/'), authenticators=(AuthRaisesAttributeError(),))
        SessionMiddleware().process_request(self.request)

        login(self.request, self.user)
        try:
            self.request.user
        except AttributeError as error:
            assert str(error) in (
                "'module' object has no attribute 'MISSPELLED_NAME_THAT_DOESNT_EXIST'",  # Python < 3.5
                "module 'rest_framework' has no attribute 'MISSPELLED_NAME_THAT_DOESNT_EXIST'",  # Python >= 3.5
            )
        else:
            assert False, 'AttributeError not raised'


class TestAuthSetter(TestCase):
    def test_auth_can_be_set(self):
        request = Request(factory.get('/'))
        request.auth = 'DUMMY'
        assert request.auth == 'DUMMY'


class TestSecure(TestCase):

    def test_default_secure_false(self):
        request = Request(factory.get('/', secure=False))
        assert request.scheme == 'http'

    def test_default_secure_true(self):
        request = Request(factory.get('/', secure=True))
        assert request.scheme == 'https'