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

import json
from io import BytesIO

import django
import pytest
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.handlers.wsgi import WSGIRequest
from django.test import TestCase
from django.utils import six

from rest_framework import status
from rest_framework.authentication import SessionAuthentication
from rest_framework.parsers import (
    BaseParser, FormParser, JSONParser, MultiPartParser
)
from rest_framework.request import Empty, Request
from rest_framework.response import Response
from rest_framework.settings import api_settings
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 TestMethodOverloading(TestCase):
    def test_method(self):
        """
        Request methods should be same as underlying request.
        """
        request = Request(factory.get('/'))
        self.assertEqual(request.method, 'GET')
        request = Request(factory.post('/'))
        self.assertEqual(request.method, 'POST')

    def test_overloaded_method(self):
        """
        POST requests can be overloaded to another method by setting a
        reserved form field
        """
        request = Request(factory.post('/', {api_settings.FORM_METHOD_OVERRIDE: 'DELETE'}))
        self.assertEqual(request.method, 'DELETE')

    def test_x_http_method_override_header(self):
        """
        POST requests can also be overloaded to another method by setting
        the X-HTTP-Method-Override header.
        """
        request = Request(factory.post('/', {'foo': 'bar'}, HTTP_X_HTTP_METHOD_OVERRIDE='DELETE'))
        self.assertEqual(request.method, 'DELETE')

        request = Request(factory.get('/', {'foo': 'bar'}, HTTP_X_HTTP_METHOD_OVERRIDE='DELETE'))
        self.assertEqual(request.method, 'DELETE')


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('/'))
        self.assertEqual(request.DATA, {})

    def test_standard_behaviour_determines_no_content_HEAD(self):
        """
        Ensure request.DATA returns empty QueryDict for HEAD request.
        """
        request = Request(factory.head('/'))
        self.assertEqual(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())
        self.assertEqual(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(),)
        self.assertEqual(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())
        self.assertEqual(list(request.POST.items()), list(data.items()))

    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())
        self.assertEqual(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(), )
        self.assertEqual(request.DATA, content)

    def test_overloaded_behaviour_allows_content_tunnelling(self):
        """
        Ensure request.DATA returns content for overloaded POST request.
        """
        json_data = {'foobar': 'qwerty'}
        content = json.dumps(json_data)
        content_type = 'application/json'
        form_data = {
            api_settings.FORM_CONTENT_OVERRIDE: content,
            api_settings.FORM_CONTENTTYPE_OVERRIDE: content_type
        }
        request = Request(factory.post('/', form_data))
        request.parsers = (JSONParser(), )
        self.assertEqual(request.DATA, json_data)

    def test_form_POST_unicode(self):
        """
        JSON POST via default web interface with unicode data
        """
        # Note: environ and other variables here have simplified content compared to real Request
        CONTENT = b'_content_type=application%2Fjson&_content=%7B%22request%22%3A+4%2C+%22firm%22%3A+1%2C+%22text%22%3A+%22%D0%9F%D1%80%D0%B8%D0%B2%D0%B5%D1%82%21%22%7D'
        environ = {
            'REQUEST_METHOD': 'POST',
            'CONTENT_TYPE': 'application/x-www-form-urlencoded',
            'CONTENT_LENGTH': len(CONTENT),
            'wsgi.input': BytesIO(CONTENT),
        }
        wsgi_request = WSGIRequest(environ=environ)
        wsgi_request._load_post_and_files()
        parsers = (JSONParser(), FormParser(), MultiPartParser())
        parser_context = {
            'encoding': 'utf-8',
            'kwargs': {},
            'args': (),
        }
        request = Request(wsgi_request, parsers=parsers, parser_context=parser_context)
        method = request.method
        self.assertEqual(method, 'POST')
        self.assertEqual(request._content_type, 'application/json')
        self.assertEqual(request._stream.getvalue(), b'{"request": 4, "firm": 1, "text": "\xd0\x9f\xd1\x80\xd0\xb8\xd0\xb2\xd0\xb5\xd1\x82!"}')
        self.assertEqual(request._data, Empty)
        self.assertEqual(request._files, Empty)


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)

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


class TestContentParsingWithAuthentication(TestCase):
    urls = 'tests.test_request'

    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)
        self.assertEqual(status.HTTP_200_OK, response.status_code)

        response = self.csrf_client.post('/', content)
        self.assertEqual(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
        self.assertEqual(self.request.user, self.user)

    def test_user_can_login(self):
        login(self.request, self.user)
        self.assertEqual(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)
        self.assertEqual(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:
            self.assertEqual(str(error), "'module' object has no attribute 'MISSPELLED_NAME_THAT_DOESNT_EXIST'")
        else:
            assert False, 'AttributeError not raised'


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


@pytest.mark.skipif(django.VERSION < (1, 7),
                    reason='secure argument is only available for django1.7+')
class TestSecure(TestCase):

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

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