import os
import unittest
import warnings
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


ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID = os.getenv("ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID")
ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY = os.getenv("ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY")
ANYMAIL_TEST_AMAZON_SES_REGION_NAME = os.getenv("ANYMAIL_TEST_AMAZON_SES_REGION_NAME", "us-east-1")
ANYMAIL_TEST_AMAZON_SES_DOMAIN = os.getenv("ANYMAIL_TEST_AMAZON_SES_DOMAIN")


@unittest.skipUnless(
    ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID
    and ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY
    and ANYMAIL_TEST_AMAZON_SES_DOMAIN,
    "Set ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID and ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY "
    "and ANYMAIL_TEST_AMAZON_SES_DOMAIN environment variables to run Amazon SES integration tests")
@override_settings(
    EMAIL_BACKEND="anymail.backends.amazon_ses.EmailBackend",
    ANYMAIL={
        "AMAZON_SES_CLIENT_PARAMS": {
            # This setting provides Anymail-specific AWS credentials to boto3.client(),
            # overriding any credentials in the environment or boto config. It's often
            # *not* the best approach -- see the Anymail and boto3 docs for other options.
            "aws_access_key_id": ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID,
            "aws_secret_access_key": ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY,
            "region_name": ANYMAIL_TEST_AMAZON_SES_REGION_NAME,
            # Can supply any other boto3.client params, including botocore.config.Config as dict
            "config": {"retries": {"max_attempts": 2}},
        },
        "AMAZON_SES_CONFIGURATION_SET_NAME": "TestConfigurationSet",  # actual config set in Anymail test account
    })
@tag('amazon_ses', 'live')
class AmazonSESBackendIntegrationTests(AnymailTestMixin, SimpleTestCase):
    """Amazon SES API integration tests

    These tests run against the **live** Amazon SES API, using the environment
    variables `ANYMAIL_TEST_AMAZON_SES_ACCESS_KEY_ID` and `ANYMAIL_TEST_AMAZON_SES_SECRET_ACCESS_KEY`
    as AWS credentials. If those variables are not set, these tests won't run.
    (You can also set the environment variable `ANYMAIL_TEST_AMAZON_SES_REGION_NAME`
    to test SES using a region other than the default "us-east-1".)

    Amazon SES doesn't offer a test mode -- it tries to send everything you ask.
    To avoid stacking up a pile of undeliverable @example.com
    emails, the tests use Amazon's @simulator.amazonses.com addresses.
    https://docs.aws.amazon.com/ses/latest/DeveloperGuide/mailbox-simulator.html
    """

    def setUp(self):
        super().setUp()
        self.from_email = 'test@%s' % ANYMAIL_TEST_AMAZON_SES_DOMAIN
        self.message = AnymailMessage('Anymail Amazon SES integration test', 'Text content',
                                      self.from_email, ['success@simulator.amazonses.com'])
        self.message.attach_alternative('<p>HTML content</p>', "text/html")

        # boto3 relies on GC to close connections. Python 3 warns about unclosed ssl.SSLSocket during cleanup.
        # We don't care. (It may be a false positive, or it may be a botocore problem, but it's not *our* problem.)
        # https://github.com/boto/boto3/issues/454#issuecomment-586033745
        # Filter in TestCase.setUp because unittest resets the warning filters for each test.
        # https://stackoverflow.com/a/26620811/647002
        warnings.filterwarnings("ignore", message=r"unclosed <ssl\.SSLSocket", category=ResourceWarning)

    def test_simple_send(self):
        # Example of getting the Amazon SES 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['success@simulator.amazonses.com'].status
        message_id = anymail_status.recipients['success@simulator.amazonses.com'].message_id

        self.assertEqual(sent_status, 'queued')  # Amazon SES always queues (or raises an error)
        self.assertRegex(message_id, r'[0-9a-f-]+')  # Amazon SES message ids are groups of hex chars
        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 Amazon SES all-options integration test",
            body="This is the text body",
            from_email=formataddr(("Test From, with comma", self.from_email)),
            to=["success+to1@simulator.amazonses.com", "Recipient 2 <success+to2@simulator.amazonses.com>"],
            cc=["success+cc1@simulator.amazonses.com", "Copy 2 <success+cc2@simulator.amazonses.com>"],
            bcc=["success+bcc1@simulator.amazonses.com", "Blind Copy 2 <success+bcc2@simulator.amazonses.com>"],
            reply_to=["reply1@example.com", "Reply 2 <reply2@example.com>"],
            headers={"X-Anymail-Test": "value"},
            metadata={"meta1": "simple_string", "meta2": 2},
            tags=["Re-engagement", "Cohort 12/2017"],
        )
        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.attach_alternative(
            "Amazon SES SendRawEmail actually supports multiple alternative parts",
            "text/x-note-for-email-geeks")

        message.send()
        self.assertEqual(message.anymail_status.status, {'queued'})

    def test_stored_template(self):
        # Using a template created like this:
        # boto3.client('ses').create_template(Template={
        #     "TemplateName": "TestTemplate",
        #     "SubjectPart": "Your order {{order}} shipped",
        #     "HtmlPart": "<h1>Dear {{name}}:</h1><p>Your order {{order}} shipped {{ship_date}}.</p>",
        #     "TextPart": "Dear {{name}}:\r\nYour order {{order}} shipped {{ship_date}}."
        # })
        message = AnymailMessage(
            template_id='TestTemplate',
            from_email=formataddr(("Test From", self.from_email)),
            to=["First Recipient <success+to1@simulator.amazonses.com>",
                "success+to2@simulator.amazonses.com"],
            merge_data={
                'success+to1@simulator.amazonses.com': {'order': 12345, 'name': "Test Recipient"},
                'success+to2@simulator.amazonses.com': {'order': 6789},
            },
            merge_global_data={
                'name': "Customer",  # default
                'ship_date': "today"
            },
        )
        message.send()
        recipient_status = message.anymail_status.recipients
        self.assertEqual(recipient_status['success+to1@simulator.amazonses.com'].status, 'queued')
        self.assertRegex(recipient_status['success+to1@simulator.amazonses.com'].message_id, r'[0-9a-f-]+')
        self.assertEqual(recipient_status['success+to2@simulator.amazonses.com'].status, 'queued')
        self.assertRegex(recipient_status['success+to2@simulator.amazonses.com'].message_id, r'[0-9a-f-]+')

    @override_settings(ANYMAIL={
        "AMAZON_SES_CLIENT_PARAMS": {
            "aws_access_key_id": "test-invalid-access-key-id",
            "aws_secret_access_key": "test-invalid-secret-access-key",
            "region_name": ANYMAIL_TEST_AMAZON_SES_REGION_NAME,
        }
    })
    def test_invalid_aws_credentials(self):
        # Make sure the exception message includes AWS's response:
        with self.assertRaisesMessage(
            AnymailAPIError,
            "The security token included in the request is invalid"
        ):
            self.message.send()