"""Resolves a NotificationType to a concrete provider. Console is always
available and never costs anything; email/SMS are only meaningfully
configured when their settings are present (callers gate on
NOTIFICATION_SMS_ENABLED before ever routing to SMS - see alert_service.py).

SMS has two interchangeable vendor providers (`SMS_PROVIDER=twilio|telnyx`),
same pattern as LLM_PROVIDER/SEARCH_PROVIDER elsewhere in the app - swapping
the setting changes which class this returns and nothing else has to change.
"""

from __future__ import annotations

from app.core.config import Settings
from app.models.enums import NotificationType
from app.notifications.base import NotificationProvider
from app.notifications.console import ConsoleProvider
from app.notifications.smtp_email import SmtpEmailProvider
from app.notifications.telnyx_sms import TelnyxSmsProvider
from app.notifications.twilio_sms import TwilioSmsProvider


def get_notification_provider(
    notification_type: NotificationType, settings: Settings
) -> NotificationProvider:
    if notification_type == NotificationType.EMAIL:
        return SmtpEmailProvider(settings)
    if notification_type == NotificationType.SMS:
        if settings.sms_provider == "telnyx":
            return TelnyxSmsProvider(settings)
        return TwilioSmsProvider(settings)
    return ConsoleProvider()