"""Twilio SMS provider via Twilio's plain REST API (no SDK dependency -
just an authenticated POST). No-ops with a clear error if Twilio isn't
configured; the caller (alert_service) is what additionally gates on
`NOTIFICATION_SMS_ENABLED` before ever constructing this provider.
"""

from __future__ import annotations

import httpx

from app.core.config import Settings
from app.notifications.base import DeliveryResult, NotificationMessage

_API_BASE = "https://api.twilio.com/2010-04-01"


class TwilioSmsProvider:
    provider_name = "twilio_sms"

    def __init__(self, settings: Settings) -> None:
        self._settings = settings

    async def send(self, message: NotificationMessage) -> DeliveryResult:
        settings = self._settings
        if not (
            settings.twilio_account_sid
            and settings.twilio_auth_token
            and settings.twilio_from_number
        ):
            return DeliveryResult(success=False, error="Twilio is not configured")

        url = f"{_API_BASE}/Accounts/{settings.twilio_account_sid}/Messages.json"
        try:
            async with httpx.AsyncClient(timeout=15) as client:
                response = await client.post(
                    url,
                    auth=(settings.twilio_account_sid, settings.twilio_auth_token),
                    data={
                        "From": settings.twilio_from_number,
                        "To": message.destination_value,
                        "Body": message.body_text,
                    },
                )
        except httpx.HTTPError as exc:
            return DeliveryResult(success=False, error=str(exc))

        if response.status_code >= 400:
            return DeliveryResult(
                success=False, error=f"Twilio error {response.status_code}: {response.text[:200]}"
            )
        data = response.json()
        return DeliveryResult(success=True, external_message_id=data.get("sid"))