import os
from django.utils import unittest
from django.test import RequestFactory
from django.conf import settings
import django.template.context
from django.template import Template, Context, RequestContext
from django.template.response import (TemplateResponse, SimpleTemplateResponse,
                                      ContentNotRenderedError)

def test_processor(request):
    return {'processors': 'yes'}
test_processor_name = 'regressiontests.templates.response.test_processor'

class BaseTemplateResponseTest(unittest.TestCase):
    # tests rely on fact that global context
    # processors should only work when RequestContext is used.

    def setUp(self):
        self.factory = RequestFactory()
        self._old_processors = settings.TEMPLATE_CONTEXT_PROCESSORS
        self._old_TEMPLATE_DIRS = settings.TEMPLATE_DIRS
        settings.TEMPLATE_CONTEXT_PROCESSORS = [test_processor_name]
        settings.TEMPLATE_DIRS = (
            os.path.join(
                os.path.dirname(__file__),
                'templates'
            ),
        )
        # Force re-evaluation of the contex processor list
        django.template.context._standard_context_processors = None

    def tearDown(self):
        settings.TEMPLATE_DIRS = self._old_TEMPLATE_DIRS
        settings.TEMPLATE_CONTEXT_PROCESSORS = self._old_processors
        # Force re-evaluation of the contex processor list
        django.template.context._standard_context_processors = None


class SimpleTemplateResponseTest(BaseTemplateResponseTest):

    def _response(self, template='foo', *args, **kwargs):
        return SimpleTemplateResponse(Template(template), *args, **kwargs)

    def test_template_resolving(self):
        response = SimpleTemplateResponse('first/test.html')
        response.render()
        self.assertEqual('First template\n', response.content)

        templates = ['foo.html', 'second/test.html', 'first/test.html']
        response = SimpleTemplateResponse(templates)
        response.render()
        self.assertEqual('Second template\n', response.content)

        response = self._response()
        response.render()
        self.assertEqual(response.content, 'foo')

    def test_explicit_baking(self):
        # explicit baking
        response = self._response()
        self.assertFalse(response.is_rendered)
        response.render()
        self.assertTrue(response.is_rendered)

    def test_render(self):
        # response is not re-rendered without the render call
        response = self._response().render()
        self.assertEqual(response.content, 'foo')

        # rebaking doesn't change the rendered content
        response.template_name = Template('bar{{ baz }}')
        response.render()
        self.assertEqual(response.content, 'foo')

        # but rendered content can be overridden by manually
        # setting content
        response.content = 'bar'
        self.assertEqual(response.content, 'bar')

    def test_iteration_unrendered(self):
        # unrendered response raises an exception on iteration
        response = self._response()
        self.assertFalse(response.is_rendered)

        def iteration():
            for x in response:
                pass
        self.assertRaises(ContentNotRenderedError, iteration)
        self.assertFalse(response.is_rendered)

    def test_iteration_rendered(self):
        # iteration works for rendered responses
        response = self._response().render()
        res = [x for x in response]
        self.assertEqual(res, ['foo'])

    def test_content_access_unrendered(self):
        # unrendered response raises an exception when content is accessed
        response = self._response()
        self.assertFalse(response.is_rendered)
        self.assertRaises(ContentNotRenderedError, lambda: response.content)
        self.assertFalse(response.is_rendered)

    def test_content_access_rendered(self):
        # rendered response content can be accessed
        response = self._response().render()
        self.assertEqual(response.content, 'foo')

    def test_set_content(self):
        # content can be overriden
        response = self._response()
        self.assertFalse(response.is_rendered)
        response.content = 'spam'
        self.assertTrue(response.is_rendered)
        self.assertEqual(response.content, 'spam')
        response.content = 'baz'
        self.assertEqual(response.content, 'baz')

    def test_dict_context(self):
        response = self._response('{{ foo }}{{ processors }}',
                                  {'foo': 'bar'})
        self.assertEqual(response.context_data, {'foo': 'bar'})
        response.render()
        self.assertEqual(response.content, 'bar')

    def test_context_instance(self):
        response = self._response('{{ foo }}{{ processors }}',
                                  Context({'foo': 'bar'}))
        self.assertEqual(response.context_data.__class__, Context)
        response.render()
        self.assertEqual(response.content, 'bar')

    def test_kwargs(self):
        response = self._response(content_type = 'application/json', status=504)
        self.assertEqual(response['content-type'], 'application/json')
        self.assertEqual(response.status_code, 504)

    def test_args(self):
        response = SimpleTemplateResponse('', {}, 'application/json', 504)
        self.assertEqual(response['content-type'], 'application/json')
        self.assertEqual(response.status_code, 504)


class TemplateResponseTest(BaseTemplateResponseTest):

    def _response(self, template='foo', *args, **kwargs):
        return TemplateResponse(self.factory.get('/'), Template(template),
                                *args, **kwargs)

    def test_render(self):
        response = self._response('{{ foo }}{{ processors }}').render()
        self.assertEqual(response.content, 'yes')

    def test_render_with_requestcontext(self):
        response = self._response('{{ foo }}{{ processors }}',
                                  {'foo': 'bar'}).render()
        self.assertEqual(response.content, 'baryes')

    def test_render_with_context(self):
        response = self._response('{{ foo }}{{ processors }}',
                                  Context({'foo': 'bar'})).render()
        self.assertEqual(response.content, 'bar')

    def test_kwargs(self):
        response = self._response(content_type = 'application/json',
                                  status=504)
        self.assertEqual(response['content-type'], 'application/json')
        self.assertEqual(response.status_code, 504)

    def test_args(self):
        response = TemplateResponse(self.factory.get('/'), '', {},
                                    'application/json', 504)
        self.assertEqual(response['content-type'], 'application/json')
        self.assertEqual(response.status_code, 504)