from mock import patch
import sys

from django.conf import settings
from django.contrib import admin
from django.contrib.auth.models import User
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
from djrill.mail.backends.djrill import DjrillBackendHTTPError


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, content="{}"):
            self.status_code = status_code
            self.content = content

    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"

        # 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.assertFalse('from_name' in data['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'])

    def test_name_addr(self):
        """Make sure RFC2822 name-addr format (with display-name) is allowed

        (Test both sender and recipient addresses)
        """
        mail.send_mail('Subject', 'Message', 'From Name <from@example.com>',
            ['Recipient #1 <to1@example.com>', 'to2@example.com'])
        data = self.get_api_call_data()
        self.assertEqual(data['message']['from_name'], "From Name")
        self.assertEqual(data['message']['from_email'], "from@example.com")
        self.assertEqual(len(data['message']['to']), 2)
        self.assertEqual(data['message']['to'][0]['name'], "Recipient #1")
        self.assertEqual(data['message']['to'][0]['email'], "to1@example.com")
        self.assertEqual(data['message']['to'][1]['name'], "")
        self.assertEqual(data['message']['to'][1]['email'], "to2@example.com")

    def test_email_message(self):
        email = mail.EmailMessage('Subject', 'Body goes here',
            'from@example.com',
            ['to1@example.com', 'Also To <to2@example.com>'],
            bcc=['bcc1@example.com', 'Also BCC <bcc2@example.com>'],
            cc=['cc1@example.com', 'Also CC <cc2@example.com>'],
            headers={'Reply-To': 'another@example.com',
                     'X-MyHeader': 'my value'})
        email.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['subject'], "Subject")
        self.assertEqual(data['message']['text'], "Body goes here")
        self.assertEqual(data['message']['from_email'], "from@example.com")
        self.assertEqual(data['message']['headers'],
            { 'Reply-To': 'another@example.com', 'X-MyHeader': 'my value' })
        # Mandrill doesn't have a notion of cc, and only allows a single bcc.
        # Djrill just treats cc and bcc as though they were "to" addresses,
        # which may or may not be what you want.
        self.assertEqual(len(data['message']['to']), 6)
        self.assertEqual(data['message']['to'][0]['email'], "to1@example.com")
        self.assertEqual(data['message']['to'][1]['email'], "to2@example.com")
        self.assertEqual(data['message']['to'][2]['email'], "cc1@example.com")
        self.assertEqual(data['message']['to'][3]['email'], "cc2@example.com")
        self.assertEqual(data['message']['to'][4]['email'], "bcc1@example.com")
        self.assertEqual(data['message']['to'][5]['email'], "bcc2@example.com")

    def test_html_message(self):
        text_content = 'This is an important message.'
        html_content = '<p>This is an <strong>important</strong> message.</p>'
        email = mail.EmailMultiAlternatives('Subject', text_content,
            'from@example.com', ['to@example.com'])
        email.attach_alternative(html_content, "text/html")
        email.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['text'], text_content)
        self.assertEqual(data['message']['html'], html_content)

    def test_extra_header_errors(self):
        email = mail.EmailMessage('Subject', 'Body', 'from@example.com',
            ['to@example.com'],
            headers={'Non-X-Non-Reply-To-Header': 'not permitted'})
        with self.assertRaises(ValueError):
            email.send()

        # Make sure fail_silently is respected
        email = mail.EmailMessage('Subject', 'Body', 'from@example.com',
            ['to@example.com'],
            headers={'Non-X-Non-Reply-To-Header': 'not permitted'})
        sent = email.send(fail_silently=True)
        self.assertFalse(self.mock_post.called,
            msg="Mandrill API should not be called when send fails silently")
        self.assertEqual(sent, 0)

    def test_alternative_errors(self):
        # Multiple alternatives not allowed
        email = mail.EmailMultiAlternatives('Subject', 'Body',
            'from@example.com', ['to@example.com'])
        email.attach_alternative("<p>First html is OK</p>", "text/html")
        email.attach_alternative("<p>But not second html</p>", "text/html")
        with self.assertRaises(ValueError):
            email.send()

        # Only html alternatives allowed
        email = mail.EmailMultiAlternatives('Subject', 'Body',
            'from@example.com', ['to@example.com'])
        email.attach_alternative("{'not': 'allowed'}", "application/json")
        with self.assertRaises(ValueError):
            email.send()

        # Make sure fail_silently is respected
        email = mail.EmailMultiAlternatives('Subject', 'Body',
            'from@example.com', ['to@example.com'])
        email.attach_alternative("{'not': 'allowed'}", "application/json")
        sent = email.send(fail_silently=True)
        self.assertFalse(self.mock_post.called,
            msg="Mandrill API should not be called when send fails silently")
        self.assertEqual(sent, 0)

    def test_mandrill_api_failure(self):
        self.mock_post.return_value = self.MockResponse(status_code=400)
        with self.assertRaises(DjrillBackendHTTPError):
            sent = mail.send_mail('Subject', 'Body', 'from@example.com',
                ['to@example.com'])
            self.assertEqual(sent, 0)

        # Make sure fail_silently is respected
        self.mock_post.return_value = self.MockResponse(status_code=400)
        sent = mail.send_mail('Subject', 'Body', 'from@example.com',
            ['to@example.com'], fail_silently=True)
        self.assertEqual(sent, 0)


class DjrillMandrillFeatureTests(DjrillBackendMockAPITestCase):
    """Test Djrill backend support for Mandrill-specific features"""

    def setUp(self):
        super(DjrillMandrillFeatureTests, self).setUp()
        self.message = mail.EmailMessage('Subject', 'Text Body',
            'from@example.com', ['to@example.com'])

    def test_tracking(self):
        # First make sure we're not setting the API param if the track_click
        # attr isn't there. (The Mandrill account option of True for html,
        # False for plaintext can't be communicated through the API, other than
        # by omitting the track_clicks API param to use your account default.)
        self.message.send()
        data = self.get_api_call_data()
        self.assertFalse('track_clicks' in data['message'])
        # Now re-send with the params set
        self.message.track_opens = True
        self.message.track_clicks = True
        self.message.url_strip_qs = True
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['track_opens'], True)
        self.assertEqual(data['message']['track_clicks'], True)
        self.assertEqual(data['message']['url_strip_qs'], True)

    def test_message_options(self):
        self.message.auto_text = True
        self.message.preserve_recipients = True
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['auto_text'], True)
        self.assertEqual(data['message']['preserve_recipients'], True)

    def test_merge(self):
        # Djrill expands simple python dicts into the more-verbose name/value
        # structures the Mandrill API uses
        self.message.global_merge_vars = { 'GREETING': "Hello",
                                           'ACCOUNT_TYPE': "Basic" }
        self.message.merge_vars = {
            "customer@example.com": { 'GREETING': "Dear Customer",
                                      'ACCOUNT_TYPE': "Premium" },
            "guest@example.com": { 'GREETING': "Dear Guest" },
        }
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['global_merge_vars'],
            [ {'name': 'ACCOUNT_TYPE', 'value': "Basic"},
              {'name': "GREETING", 'value': "Hello"} ])
        self.assertEqual(data['message']['merge_vars'],
            [ { 'rcpt': "customer@example.com",
                'vars': [{ 'name': 'ACCOUNT_TYPE', 'value': "Premium" },
                         { 'name': "GREETING", 'value': "Dear Customer"}] },
              { 'rcpt': "guest@example.com",
                'vars': [{ 'name': "GREETING", 'value': "Dear Guest"}] }
            ])

    def test_tags(self):
        self.message.tags = ["receipt", "repeat-user"]
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['tags'], ["receipt", "repeat-user"])

    def test_google_analytics(self):
        self.message.google_analytics_domains = ["example.com"]
        self.message.google_analytics_campaign = "Email Receipts"
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['google_analytics_domains'],
            ["example.com"])
        self.assertEqual(data['message']['google_analytics_campaign'],
            "Email Receipts")

    def test_metadata(self):
        self.message.metadata = { 'batch_num': "12345", 'type': "Receipts" }
        self.message.recipient_metadata = {
            # Djrill expands simple python dicts into the more-verbose
            # name/value structures the Mandrill API uses
            "customer@example.com": { 'cust_id': "67890", 'order_id': "54321" },
            "guest@example.com": { 'cust_id': "94107", 'order_id': "43215" }
        }
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['message']['metadata'], { 'batch_num': "12345",
                                                        'type': "Receipts" })
        self.assertEqual(data['message']['recipient_metadata'],
            [ { 'rcpt': "customer@example.com",
                'values': { 'cust_id': "67890", 'order_id': "54321" } },
              { 'rcpt': "guest@example.com",
                'values': { 'cust_id': "94107", 'order_id': "43215" } }
            ])

    def test_default_omits_options(self):
        """Make sure by default we don't send any Mandrill-specific options.

        Options not specified by the caller should be omitted entirely from
        the Mandrill API call (*not* sent as False or empty). This ensures
        that your Mandrill account settings apply by default.
        """
        self.message.send()
        data = self.get_api_call_data()
        self.assertFalse('from_name' in data['message'])
        self.assertFalse('track_opens' in data['message'])
        self.assertFalse('track_clicks' in data['message'])
        self.assertFalse('auto_text' in data['message'])
        self.assertFalse('url_strip_qs' in data['message'])
        self.assertFalse('tags' in data['message'])
        self.assertFalse('preserve_recipients' in data['message'])
        self.assertFalse('google_analytics_domains' in data['message'])
        self.assertFalse('google_analytics_campaign' in data['message'])
        self.assertFalse('metadata' in data['message'])
        self.assertFalse('global_merge_vars' in data['message'])
        self.assertFalse('merge_vars' in data['message'])
        self.assertFalse('recipient_metadata' in data['message'])


def reset_admin_site():
    """Return the Django admin globals to their original state"""
    admin.site = admin.AdminSite() # restore default
    if 'djrill.admin' in sys.modules:
        del sys.modules['djrill.admin'] # force autodiscover to re-import


class DjrillAdminTests(DjrillBackendMockAPITestCase):
    """Test the Djrill admin site"""

    # These tests currently just verify that the admin site pages load
    # without error -- they don't test any Mandrill-supplied content.
    # (Future improvements could mock the Mandrill responses.)

    # These urls set up the DjrillAdminSite as suggested in the readme
    urls = 'djrill.test_admin_urls'

    @classmethod
    def setUpClass(cls):
        # Other test cases may muck with the Django admin site globals,
        # so return it to the default state before loading test_admin_urls
        reset_admin_site()

    def setUp(self):
        super(DjrillAdminTests, self).setUp()
        # Must be authenticated staff to access admin site...
        admin = User.objects.create_user('admin', 'admin@example.com', 'secret')
        admin.is_staff = True
        admin.save()
        self.client.login(username='admin', password='secret')

    def test_admin_senders(self):
        response = self.client.get('/admin/djrill/senders/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Senders")

    def test_admin_status(self):
        response = self.client.get('/admin/djrill/status/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Status")

    def test_admin_tags(self):
        response = self.client.get('/admin/djrill/tags/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Tags")

    def test_admin_urls(self):
        response = self.client.get('/admin/djrill/urls/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "URLs")

    def test_admin_index(self):
        """Make sure Djrill section is included in the admin index page"""
        response = self.client.get('/admin/')
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, "Djrill")


class DjrillNoAdminTests(TestCase):
    def test_admin_autodiscover_without_djrill(self):
        """Make sure autodiscover doesn't die without DjrillAdminSite"""
        reset_admin_site()
        admin.autodiscover() # test: this shouldn't error


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)