import os
import unittest
from datetime import datetime, timedelta
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_SPARKPOST_API_KEY = os.getenv("ANYMAIL_TEST_SPARKPOST_API_KEY")
ANYMAIL_TEST_SPARKPOST_DOMAIN = os.getenv("ANYMAIL_TEST_SPARKPOST_DOMAIN")


@tag("sparkpost", "live")
@unittest.skipUnless(
    ANYMAIL_TEST_SPARKPOST_API_KEY and ANYMAIL_TEST_SPARKPOST_DOMAIN,
    "Set ANYMAIL_TEST_SPARKPOST_API_KEY and ANYMAIL_TEST_SPARKPOST_DOMAIN "
    "environment variables to run SparkPost integration tests",
)
@override_settings(
    ANYMAIL_SPARKPOST_API_KEY=ANYMAIL_TEST_SPARKPOST_API_KEY,
    EMAIL_BACKEND="anymail.backends.sparkpost.EmailBackend",
)
class SparkPostBackendIntegrationTests(AnymailTestMixin, SimpleTestCase):
    """SparkPost API integration tests

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

    SparkPost 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 SparkPost's "sink domain" @*.sink.sparkpostmail.com.
    https://www.sparkpost.com/docs/faq/using-sink-server/
    """

    def setUp(self):
        super().setUp()
        self.from_email = "test@%s" % ANYMAIL_TEST_SPARKPOST_DOMAIN
        self.message = AnymailMessage(
            "Anymail SparkPost integration test",
            "Text content",
            self.from_email,
            ["to@test.sink.sparkpostmail.com"],
        )
        self.message.attach_alternative("<p>HTML content</p>", "text/html")

    def test_simple_send(self):
        # Example of getting the SparkPost send status
        # and transmission 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["to@test.sink.sparkpostmail.com"].status
        message_id = anymail_status.recipients[
            "to@test.sink.sparkpostmail.com"
        ].message_id

        self.assertEqual(sent_status, "queued")  # SparkPost always queues
        # this is actually the transmission_id; should be non-blank:
        self.assertRegex(message_id, r".+")
        # set of all recipient statuses:
        self.assertEqual(anymail_status.status, {sent_status})
        self.assertEqual(anymail_status.message_id, message_id)

    def test_all_options(self):
        send_at = datetime.now() + timedelta(minutes=2)
        message = AnymailMessage(
            subject="Anymail all-options integration test",
            body="This is the text body",
            from_email=formataddr(("Test From, with comma", self.from_email)),
            to=[
                "to1@test.sink.sparkpostmail.com",
                "Recipient 2 <to2@test.sink.sparkpostmail.com>",
            ],
            # Limit the live b/cc's to avoid running through our small monthly
            # allowance:
            cc=["Copy To <cc@test.sink.sparkpostmail.com>"],
            reply_to=["reply1@example.com", "Reply 2 <reply2@example.com>"],
            headers={"X-Anymail-Test": "value"},
            metadata={"meta1": "simple string", "meta2": 2},
            send_at=send_at,
            tags=["tag 1"],  # SparkPost only supports single tags
            track_clicks=True,
            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()
        # SparkPost always queues:
        self.assertEqual(message.anymail_status.status, {"queued"})

    def test_merge_data(self):
        message = AnymailMessage(
            subject="Anymail merge_data test: {{ value }}",
            body="This body includes merge data: {{ value }}\n"
            "And global merge data: {{ global }}",
            from_email=formataddr(("Test From", self.from_email)),
            to=[
                "to1@test.sink.sparkpostmail.com",
                "Recipient 2 <to2@test.sink.sparkpostmail.com>",
            ],
            merge_data={
                "to1@test.sink.sparkpostmail.com": {"value": "one"},
                "to2@test.sink.sparkpostmail.com": {"value": "two"},
            },
            merge_global_data={"global": "global_value"},
            merge_metadata={
                "to1@test.sink.sparkpostmail.com": {"meta1": "one"},
                "to2@test.sink.sparkpostmail.com": {"meta1": "two"},
            },
            headers={
                "X-Custom": "custom header default",
            },
            merge_headers={
                # (Note that SparkPost doesn't support custom List-Unsubscribe headers)
                "to1@test.sink.sparkpostmail.com": {
                    "X-Custom": "custom header one",
                },
            },
        )
        message.send()
        recipient_status = message.anymail_status.recipients
        self.assertEqual(
            recipient_status["to1@test.sink.sparkpostmail.com"].status, "queued"
        )
        self.assertEqual(
            recipient_status["to2@test.sink.sparkpostmail.com"].status, "queued"
        )

    def test_stored_template(self):
        message = AnymailMessage(
            # a real template in our SparkPost test account:
            template_id="test-template",
            to=["to1@test.sink.sparkpostmail.com"],
            merge_data={
                "to1@test.sink.sparkpostmail.com": {
                    "name": "Test Recipient",
                }
            },
            merge_global_data={
                "order": "12345",
            },
        )
        message.from_email = None  # from_email must come from stored template
        message.send()
        recipient_status = message.anymail_status.recipients
        self.assertEqual(
            recipient_status["to1@test.sink.sparkpostmail.com"].status, "queued"
        )

    @override_settings(ANYMAIL_SPARKPOST_API_KEY="Hey, that's not an API key!")
    def test_invalid_api_key(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 SparkPost's response:
        self.assertIn("Unauthorized", str(err))