from unittest import mock

from django.conf import settings
from django.core import mail
from django.core.mail import EmailMessage, get_connection
from django.test import TestCase

from desecapi import mail_backends


@mock.patch.dict(
    mail_backends.TASKS,
    {
        key: type(
            "obj", (object,), {"delay": mail_backends.MultiLaneEmailBackend._run_task}
        )
        for key in mail_backends.TASKS
    },
)
class MultiLaneEmailBackendTestCase(TestCase):
    test_backend = settings.EMAIL_BACKEND

    def test_lanes(self):
        debug_params = {"foo": "bar"}
        debug_params_orig = debug_params.copy()

        with self.settings(
            EMAIL_BACKEND="desecapi.mail_backends.MultiLaneEmailBackend"
        ):
            for lane in ["email_slow_lane", "email_fast_lane", None]:
                subject = f"Test subject for lane {lane}"
                connection = get_connection(
                    lane=lane, backbackend=self.test_backend, debug=debug_params
                )
                EmailMessage(
                    subject=subject, to=["to@test.invalid"], connection=connection
                ).send()
                self.assertEqual(
                    mail.outbox[-1].connection.task_kwargs["debug"],
                    {"lane": lane or "email_slow_lane", **debug_params},
                )
                self.assertEqual(mail.outbox[-1].subject, subject)

        # Check that the backend hasn't modified the dict we passed
        self.assertEqual(debug_params, debug_params_orig)