from mock import patch

from django.conf import settings
from django.core import mail
from django.core.exceptions import ImproperlyConfigured
from django.test import TestCase
from django.utils import simplejson as json

from djrill.mail import DjrillMessage

class DjrillBackendMockAPITestCase(TestCase):
    """TestCase that uses Djrill EmailBackend with a mocked Mandrill API"""

    class MockResponse:
        """requests.post return value mock sufficient for DjrillBackend"""
        def __init__(self, status_code=200):
            self.status_code = status_code

    def setUp(self):
        self.patch = patch('requests.post')
        self.mock_post = self.patch.start()
        self.mock_post.return_value = self.MockResponse()

        settings.MANDRILL_API_KEY = "FAKE_API_KEY_FOR_TESTING"
        settings.MANDRILL_API_URL = "http://mandrillapp.com/api/1.0"

        # Django TestCase sets up locmem EmailBackend; override it here
        self.original_email_backend = settings.EMAIL_BACKEND
        settings.EMAIL_BACKEND = "djrill.mail.backends.djrill.DjrillBackend"

    def tearDown(self):
        self.patch.stop()
        settings.EMAIL_BACKEND = self.original_email_backend

    def get_api_call_data(self):
        """Returns the data posted to the Mandrill API.

        Fails test if API wasn't called.
        """
        if self.mock_post.call_args is None:
            raise AssertionError("Mandrill API was not called")
        (args, kwargs) = self.mock_post.call_args
        if 'data' not in kwargs:
            raise AssertionError("requests.post was called without data kwarg "
                "-- Maybe tests need to be updated for backend changes?")
        return json.loads(kwargs['data'])


class DjrillBackendTests(DjrillBackendMockAPITestCase):
    """Test Djrill's support for Django mail wrappers"""

    def test_send_mail(self):
        mail.send_mail('Subject here', 'Here is the message.',
            'from@example.com', ['to@example.com'], fail_silently=False)
        data = self.get_api_call_data()
        self.assertEqual(data['message']['subject'], "Subject here")
        self.assertEqual(data['message']['text'], "Here is the message.")
        self.assertEqual(data['message']['from_email'], "from@example.com")
        self.assertEqual(len(data['message']['to']), 1)
        self.assertEqual(data['message']['to'][0]['email'], "to@example.com")

    def test_missing_api_key(self):
        del settings.MANDRILL_API_KEY
        with self.assertRaises(ImproperlyConfigured):
            mail.send_mail('Subject', 'Message', 'from@example.com',
                ['to@example.com'])


class DjrillMessageTests(TestCase):
    def setUp(self):
        self.subject = "Djrill baby djrill."
        self.from_name = "Tarzan"
        self.from_email = "test@example"
        self.to = ["King Kong <kingkong@example.com>",
            "Cheetah <cheetah@example.com", "bubbles@example.com"]
        self.text_content = "Wonderful fallback text content."
        self.html_content = "<h1>That's a nice HTML email right there.</h1>"
        self.headers = {"Reply-To": "tarzan@example.com"}
        self.tags = ["track", "this"]

    def test_djrill_message_success(self):
        msg = DjrillMessage(self.subject, self.text_content, self.from_email,
            self.to, tags=self.tags, headers=self.headers,
            from_name=self.from_name)

        self.assertIsInstance(msg, DjrillMessage)
        self.assertEqual(msg.body, self.text_content)
        self.assertEqual(msg.recipients(), self.to)
        self.assertEqual(msg.tags, self.tags)
        self.assertEqual(msg.extra_headers, self.headers)
        self.assertEqual(msg.from_name, self.from_name)

    def test_djrill_message_html_success(self):
        msg = DjrillMessage(self.subject, self.text_content, self.from_email,
            self.to, tags=self.tags)
        msg.attach_alternative(self.html_content, "text/html")

        self.assertEqual(msg.alternatives[0][0], self.html_content)

    def test_djrill_message_tag_failure(self):
        with self.assertRaises(ImproperlyConfigured):
            DjrillMessage(self.subject, self.text_content, self.from_email,
                self.to, tags=["_fail"])

    def test_djrill_message_tag_skip(self):
        """
        Test that tags over 50 chars are not included in the tags list.
        """
        tags = ["works", "awesomesauce",
         "iwilltestmycodeiwilltestmycodeiwilltestmycodeiwilltestmycode"]
        msg = DjrillMessage(self.subject, self.text_content, self.from_email,
            self.to, tags=tags)

        self.assertIsInstance(msg, DjrillMessage)
        self.assertIn(tags[0], msg.tags)
        self.assertIn(tags[1], msg.tags)
        self.assertNotIn(tags[2], msg.tags)