import os
import unittest
from email.utils import formataddr

from django.core import mail
from django.test import SimpleTestCase, override_settings, tag

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

from .utils import AnymailTestMixin, sample_image_path

ANYMAIL_TEST_MANDRILL_API_KEY = os.getenv("ANYMAIL_TEST_MANDRILL_API_KEY")
ANYMAIL_TEST_MANDRILL_DOMAIN = os.getenv("ANYMAIL_TEST_MANDRILL_DOMAIN")


@tag("mandrill", "live")
@unittest.skipUnless(
    ANYMAIL_TEST_MANDRILL_API_KEY and ANYMAIL_TEST_MANDRILL_DOMAIN,
    "Set ANYMAIL_TEST_MANDRILL_API_KEY and ANYMAIL_TEST_MANDRILL_DOMAIN "
    "environment variables to run integration tests",
)
@override_settings(
    MANDRILL_API_KEY=ANYMAIL_TEST_MANDRILL_API_KEY,
    EMAIL_BACKEND="anymail.backends.mandrill.EmailBackend",
)
class MandrillBackendIntegrationTests(AnymailTestMixin, SimpleTestCase):
    """Mandrill API integration tests

    These tests run against the **live** Mandrill API, using the
    environment variable `ANYMAIL_TEST_MANDRILL_API_KEY` as the API key.
    If that variable is not set, these tests won't run.

    See https://mailchimp.com/developer/transactional/docs/fundamentals/#test-mode
    for info on Mandrill test keys.
    """

    def setUp(self):
        super().setUp()
        self.from_email = self.addr("from")
        self.message = mail.EmailMultiAlternatives(
            "Anymail Mandrill integration test",
            "Text content",
            self.from_email,
            [self.addr("test+to1")],
        )
        self.message.attach_alternative("<p>HTML content</p>", "text/html")

    def addr(self, username, display_name=None):
        """Construct test email address within our test domain"""
        # Because integration tests run within a Mandrill trial account,
        # both sender and recipient addresses must be within the test domain.
        # (Other recipient addresses will be rejected with 'recipient-domain-mismatch'.)
        email = "{username}@{domain}".format(
            username=username, domain=ANYMAIL_TEST_MANDRILL_DOMAIN
        )
        if display_name is not None:
            return formataddr((display_name, email))
        else:
            return email

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

        # noinspection PyUnresolvedReferences
        anymail_status = self.message.anymail_status
        to_email = self.message.to[0]  # test+to1@{ANYMAIL_TEST_MANDRILL_DOMAIN}
        sent_status = anymail_status.recipients[to_email].status
        message_id = anymail_status.recipients[to_email].message_id

        # successful send (could still bounce later):
        self.assertIn(sent_status, ["sent", "queued"])
        # don't know what it'll be, but it should exist:
        self.assertGreater(len(message_id), 0)

        # set of all recipient statuses:
        self.assertEqual(anymail_status.status, {sent_status})
        # because only a single recipient (else would be a set):
        self.assertEqual(anymail_status.message_id, message_id)

    def test_all_options(self):
        message = AnymailMessage(
            subject="Anymail Mandrill all-options integration test",
            body="This is the text body",
            from_email=self.addr("from", "Test From, with comma"),
            to=[self.addr("test+to1"), self.addr("test+to2", "Recipient 2")],
            cc=[self.addr("test+cc1"), self.addr("test+cc2", "Copy 2")],
            bcc=[self.addr("test+bcc1"), self.addr("test+bcc2", "Blind Copy 2")],
            reply_to=["reply1@example.com", "Reply 2 <reply2@example.com>"],
            headers={"X-Anymail-Test": "value"},
            # no metadata, send_at, track_clicks support
            tags=["tag 1"],  # max one tag
            track_opens=True,
        )
        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.assertTrue(message.anymail_status.status.issubset({"queued", "sent"}))

    def test_invalid_from(self):
        # Example of trying to send from an invalid address
        # Mandrill returns a 500 response (which raises a MandrillAPIError)
        self.message.from_email = (
            "webmaster@localhost"  # Django default DEFAULT_FROM_EMAIL
        )
        with self.assertRaises(AnymailAPIError) as cm:
            self.message.send()
        err = cm.exception
        self.assertEqual(err.status_code, 500)
        self.assertIn("email address is invalid", str(err))

    def test_invalid_to(self):
        # Example of detecting when a recipient is not a valid email address
        self.message.to = ["invalid@localhost"]
        try:
            self.message.send()
        except AnymailRecipientsRefused:
            # Mandrill refused to deliver the mail -- message.anymail_status
            # will tell you why:
            # noinspection PyUnresolvedReferences
            anymail_status = self.message.anymail_status
            self.assertEqual(
                anymail_status.recipients["invalid@localhost"].status, "invalid"
            )
            self.assertEqual(anymail_status.status, {"invalid"})
        else:
            # Sometimes Mandrill queues these test sends
            # noinspection PyUnresolvedReferences
            if self.message.anymail_status.status == {"queued"}:
                self.skipTest("Mandrill queued the send -- can't complete this test")
            else:
                self.fail(
                    "Anymail did not raise AnymailRecipientsRefused"
                    " for invalid recipient"
                )

    def test_rejected_to(self):
        # Example of detecting when a recipient is on Mandrill's rejection blacklist
        self.message.to = ["reject@test.mandrillapp.com"]
        try:
            self.message.send()
        except AnymailRecipientsRefused:
            # Mandrill refused to deliver the mail -- message.anymail_status will
            # tell you why:
            # noinspection PyUnresolvedReferences
            anymail_status = self.message.anymail_status
            self.assertEqual(
                anymail_status.recipients["reject@test.mandrillapp.com"].status,
                "rejected",
            )
            self.assertEqual(anymail_status.status, {"rejected"})
        else:
            # Sometimes Mandrill queues these test sends
            # noinspection PyUnresolvedReferences
            if self.message.anymail_status.status == {"queued"}:
                self.skipTest("Mandrill queued the send -- can't complete this test")
            else:
                self.fail(
                    "Anymail did not raise AnymailRecipientsRefused"
                    " for blacklist recipient"
                )

    @override_settings(MANDRILL_API_KEY="Hey, that's not an API key!")
    def test_invalid_api_key(self):
        # Example of trying to send with an invalid MANDRILL_API_KEY.
        # Mandrill responds either 401 or 500 status for this case (it varies),
        # but always seems to include the message "Invalid API key".
        # Either response should result in an AnymailAPIError.
        with self.assertRaisesMessage(AnymailAPIError, "Invalid API key"):
            self.message.send()