from __future__ import unicode_literals

from django.test import TestCase

from rest_framework.negotiation import DefaultContentNegotiation
from rest_framework.renderers import BaseRenderer
from rest_framework.request import Request
from rest_framework.test import APIRequestFactory

factory = APIRequestFactory()


class MockOpenAPIRenderer(BaseRenderer):
    media_type = 'application/openapi+json;version=2.0'
    format = 'swagger'


class MockJSONRenderer(BaseRenderer):
    media_type = 'application/json'


class MockHTMLRenderer(BaseRenderer):
    media_type = 'text/html'


class NoCharsetSpecifiedRenderer(BaseRenderer):
    media_type = 'my/media'


class TestAcceptedMediaType(TestCase):
    def setUp(self):
        self.renderers = [MockJSONRenderer(), MockHTMLRenderer(), MockOpenAPIRenderer()]
        self.negotiator = DefaultContentNegotiation()

    def select_renderer(self, request):
        return self.negotiator.select_renderer(request, self.renderers)

    def test_client_without_accept_use_renderer(self):
        request = Request(factory.get('/'))
        accepted_renderer, accepted_media_type = self.select_renderer(request)
        self.assertEqual(accepted_media_type, 'application/json')

    def test_client_underspecifies_accept_use_renderer(self):
        request = Request(factory.get('/', HTTP_ACCEPT='*/*'))
        accepted_renderer, accepted_media_type = self.select_renderer(request)
        self.assertEqual(accepted_media_type, 'application/json')

    def test_client_overspecifies_accept_use_client(self):
        request = Request(factory.get('/', HTTP_ACCEPT='application/json; indent=8'))
        accepted_renderer, accepted_media_type = self.select_renderer(request)
        self.assertEqual(accepted_media_type, 'application/json; indent=8')

    def test_client_specifies_parameter(self):
        request = Request(factory.get('/', HTTP_ACCEPT='application/openapi+json;version=2.0'))
        accepted_renderer, accepted_media_type = self.select_renderer(request)
        self.assertEqual(accepted_media_type, 'application/openapi+json;version=2.0')
        self.assertEqual(accepted_renderer.format, 'swagger')