from unittest.mock import MagicMock, patch

from app.notifications.emailer import EmailNotifier


def _notifier(**overrides) -> EmailNotifier:
    defaults = dict(
        host="smtp.example.com",
        port=587,
        username="user@example.com",
        password="secret",
        from_address="sync@example.com",
        use_tls=True,
    )
    defaults.update(overrides)
    return EmailNotifier(**defaults)


def test_unconfigured_notifier_is_not_configured() -> None:
    notifier = _notifier(host=None)
    assert notifier.configured is False


def test_configured_notifier_is_configured() -> None:
    assert _notifier().configured is True


def test_send_skips_silently_when_not_configured() -> None:
    notifier = _notifier(host=None)
    with patch("app.notifications.emailer.smtplib.SMTP") as smtp_cls:
        notifier.send(to_address="user@example.com", subject="s", body="b")
    smtp_cls.assert_not_called()


def test_send_uses_starttls_and_login_when_configured() -> None:
    notifier = _notifier()
    smtp_instance = MagicMock()
    smtp_instance.__enter__.return_value = smtp_instance
    with patch("app.notifications.emailer.smtplib.SMTP", return_value=smtp_instance) as smtp_cls:
        notifier.send(to_address="rider@example.com", subject="Action required", body="Check the dashboard")

    smtp_cls.assert_called_once_with("smtp.example.com", 587, timeout=10)
    smtp_instance.starttls.assert_called_once()
    smtp_instance.login.assert_called_once_with("user@example.com", "secret")
    assert smtp_instance.send_message.call_count == 1
    sent_message = smtp_instance.send_message.call_args[0][0]
    assert sent_message["To"] == "rider@example.com"
    assert sent_message["From"] == "sync@example.com"
    assert sent_message["Subject"] == "Action required"


def test_send_skips_login_without_credentials() -> None:
    notifier = _notifier(username=None, password=None)
    smtp_instance = MagicMock()
    smtp_instance.__enter__.return_value = smtp_instance
    with patch("app.notifications.emailer.smtplib.SMTP", return_value=smtp_instance):
        notifier.send(to_address="rider@example.com", subject="s", body="b")

    smtp_instance.login.assert_not_called()


def test_send_skips_starttls_when_disabled() -> None:
    notifier = _notifier(use_tls=False)
    smtp_instance = MagicMock()
    smtp_instance.__enter__.return_value = smtp_instance
    with patch("app.notifications.emailer.smtplib.SMTP", return_value=smtp_instance):
        notifier.send(to_address="rider@example.com", subject="s", body="b")

    smtp_instance.starttls.assert_not_called()