import os
import unittest
from email.utils import formataddr

from django.test import SimpleTestCase, override_settings, tag

from anymail.exceptions import AnymailAPIError
from anymail.message import AnymailMessage

from .utils import AnymailTestMixin, sample_image_path


# For most integration tests, Postmark's sandboxed "POSTMARK_API_TEST" token is used.
# But to test template sends, a real Postmark server token and template id are needed:
ANYMAIL_TEST_POSTMARK_SERVER_TOKEN = os.getenv('ANYMAIL_TEST_POSTMARK_SERVER_TOKEN')
ANYMAIL_TEST_POSTMARK_TEMPLATE_ID = os.getenv('ANYMAIL_TEST_POSTMARK_TEMPLATE_ID')
ANYMAIL_TEST_POSTMARK_DOMAIN = os.getenv('ANYMAIL_TEST_POSTMARK_DOMAIN')


@tag('postmark', 'live')
@unittest.skipUnless(ANYMAIL_TEST_POSTMARK_DOMAIN,
                     "Set ANYMAIL_TEST_POSTMARK_DOMAIN environment variable "
                     "to run Postmark template integration tests")
@override_settings(ANYMAIL_POSTMARK_SERVER_TOKEN="POSTMARK_API_TEST",
                   EMAIL_BACKEND="anymail.backends.postmark.EmailBackend")
class PostmarkBackendIntegrationTests(AnymailTestMixin, SimpleTestCase):
    """Postmark API integration tests

    These tests run against the **live** Postmark API, but using a
    test key that's not capable of sending actual email.
    """

    def setUp(self):
        super().setUp()
        self.from_email = 'from@%s' % ANYMAIL_TEST_POSTMARK_DOMAIN
        self.message = AnymailMessage('Anymail Postmark integration test', 'Text content',
                                      self.from_email, ['test+to1@anymail.dev'])
        self.message.attach_alternative('<p>HTML content</p>', "text/html")

    def test_simple_send(self):
        # Example of getting the Postmark send status and message id from the message
        sent_count = self.message.send()
        self.assertEqual(sent_count, 1)

        anymail_status = self.message.anymail_status
        sent_status = anymail_status.recipients['test+to1@anymail.dev'].status
        message_id = anymail_status.recipients['test+to1@anymail.dev'].message_id

        self.assertEqual(sent_status, 'sent')
        self.assertGreater(len(message_id), 0)  # non-empty string
        self.assertEqual(anymail_status.status, {sent_status})  # set of all recipient statuses
        self.assertEqual(anymail_status.message_id, message_id)

    def test_all_options(self):
        message = AnymailMessage(
            subject="Anymail Postmark all-options integration test",
            body="This is the text body",
            from_email=formataddr(("Test From, with comma", self.from_email)),
            to=["test+to1@anymail.dev", "Recipient 2 <test+to2@anymail.dev>"],
            cc=["test+cc1@anymail.dev", "Copy 2 <test+cc2@anymail.dev>"],
            bcc=["test+bcc1@anymail.dev", "Blind Copy 2 <test+bcc2@anymail.dev>"],
            reply_to=["reply1@example.com", "Reply 2 <reply2@example.com>"],
            headers={"X-Anymail-Test": "value"},

            # no send_at support
            metadata={"meta1": "simple string", "meta2": 2},
            tags=["tag 1"],  # max one tag
            track_opens=True,
            track_clicks=True,
            merge_data={},  # force batch send (distinct message for each `to`)
        )
        message.attach("attachment1.txt", "Here is some\ntext for you", "text/plain")
        message.attach("attachment2.csv", "ID,Name\n1,Amy Lina", "text/csv")
        cid = message.attach_inline_image_file(sample_image_path())
        message.attach_alternative(
            "<p><b>HTML:</b> with <a href='http://example.com'>link</a>"
            "and image: <img src='cid:%s'></div>" % cid,
            "text/html")

        message.send()
        self.assertEqual(message.anymail_status.status, {'sent'})
        self.assertEqual(message.anymail_status.recipients['test+to1@anymail.dev'].status, 'sent')
        self.assertEqual(message.anymail_status.recipients['test+to2@anymail.dev'].status, 'sent')
        # distinct messages should have different message_ids:
        self.assertNotEqual(message.anymail_status.recipients['test+to1@anymail.dev'].message_id,
                            message.anymail_status.recipients['test+to2@anymail.dev'].message_id)

    def test_invalid_from(self):
        self.message.from_email = 'webmaster@localhost'  # Django's default From
        with self.assertRaises(AnymailAPIError) as cm:
            self.message.send()
        err = cm.exception
        self.assertEqual(err.status_code, 422)
        self.assertIn("Invalid 'From' address", str(err))

    @unittest.skipUnless(
        ANYMAIL_TEST_POSTMARK_SERVER_TOKEN
        and ANYMAIL_TEST_POSTMARK_TEMPLATE_ID
        and ANYMAIL_TEST_POSTMARK_DOMAIN,
        "Set ANYMAIL_TEST_POSTMARK_SERVER_TOKEN and ANYMAIL_TEST_POSTMARK_TEMPLATE_ID "
        "and ANYMAIL_TEST_POSTMARK_DOMAIN environment variables to run Postmark template integration tests")
    @override_settings(ANYMAIL_POSTMARK_SERVER_TOKEN=ANYMAIL_TEST_POSTMARK_SERVER_TOKEN)
    def test_template(self):
        message = AnymailMessage(
            from_email=self.from_email,
            to=["test+to1@anymail.dev", "Second Recipient <test+to2@anymail.dev>"],
            template_id=ANYMAIL_TEST_POSTMARK_TEMPLATE_ID,
            merge_data={
                "test+to1@anymail.dev": {"name": "Recipient 1", "order_no": "12345"},
                "test+to2@anymail.dev": {"order_no": "6789"},
            },
            merge_global_data={"name": "Valued Customer"},
        )
        message.send()
        self.assertEqual(message.anymail_status.status, {'sent'})

    @override_settings(ANYMAIL_POSTMARK_SERVER_TOKEN="Hey, that's not a server token!")
    def test_invalid_server_token(self):
        with self.assertRaises(AnymailAPIError) as cm:
            self.message.send()
        err = cm.exception
        self.assertEqual(err.status_code, 401)
        # Make sure the exception message includes Postmark's response:
        self.assertIn("Please verify that you are using a valid token", str(err))