from django.core import mail
from django.core.management import CommandError, call_command
from django.test import SimpleTestCase, override_settings


@override_settings(
    ADMINS=["admin@example.com", "admin_and_manager@example.com"],
    MANAGERS=["manager@example.com", "admin_and_manager@example.com"],
)
class SendTestEmailManagementCommand(SimpleTestCase):
    """
    Test the sending of a test email using the `sendtestemail` command.
    """

    def test_single_receiver(self):
        """
        The mail is sent with the correct subject and recipient.
        """
        recipient = "joe@example.com"
        call_command("sendtestemail", recipient)
        self.assertEqual(len(mail.outbox), 1)
        mail_message = mail.outbox[0]
        self.assertEqual(mail_message.subject[0:15], "Test email from")
        self.assertEqual(mail_message.recipients(), [recipient])

    def test_multiple_receivers(self):
        """
        The mail may be sent with multiple recipients.
        """
        recipients = ["joe@example.com", "jane@example.com"]
        call_command("sendtestemail", recipients[0], recipients[1])
        self.assertEqual(len(mail.outbox), 1)
        mail_message = mail.outbox[0]
        self.assertEqual(mail_message.subject[0:15], "Test email from")
        self.assertEqual(
            sorted(mail_message.recipients()),
            [
                "jane@example.com",
                "joe@example.com",
            ],
        )

    def test_missing_receivers(self):
        """
        The command should complain if no receivers are given (and --admins or
        --managers are not set).
        """
        msg = (
            "You must specify some email recipients, or pass the --managers or "
            "--admin options."
        )
        with self.assertRaisesMessage(CommandError, msg):
            call_command("sendtestemail")

    def test_manager_receivers(self):
        """
        The mail should be sent to the email addresses specified in
        settings.MANAGERS.
        """
        call_command("sendtestemail", "--managers")
        self.assertEqual(len(mail.outbox), 1)
        mail_message = mail.outbox[0]
        self.assertEqual(
            sorted(mail_message.recipients()),
            [
                "admin_and_manager@example.com",
                "manager@example.com",
            ],
        )

    def test_admin_receivers(self):
        """
        The mail should be sent to the email addresses specified in
        settings.ADMIN.
        """
        call_command("sendtestemail", "--admins")
        self.assertEqual(len(mail.outbox), 1)
        mail_message = mail.outbox[0]
        self.assertEqual(
            sorted(mail_message.recipients()),
            [
                "admin@example.com",
                "admin_and_manager@example.com",
            ],
        )

    def test_manager_and_admin_receivers(self):
        """
        The mail should be sent to the email addresses specified in both
        settings.MANAGERS and settings.ADMINS.
        """
        call_command("sendtestemail", "--managers", "--admins")
        self.assertEqual(len(mail.outbox), 2)
        manager_mail = mail.outbox[0]
        self.assertEqual(
            sorted(manager_mail.recipients()),
            [
                "admin_and_manager@example.com",
                "manager@example.com",
            ],
        )
        admin_mail = mail.outbox[1]
        self.assertEqual(
            sorted(admin_mail.recipients()),
            [
                "admin@example.com",
                "admin_and_manager@example.com",
            ],
        )
