"""Telnyx SMS provider via Telnyx's Programmable Messaging REST API (no SDK
dependency - just a Bearer-authenticated POST), mirroring twilio_sms.py's
shape. No-ops with a clear error if Telnyx 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_URL = "https://api.telnyx.com/v2/messages"


class TelnyxSmsProvider:
    provider_name = "telnyx_sms"

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

    async def send(self, message: NotificationMessage) -> DeliveryResult:
        settings = self._settings
        if not (settings.telnyx_api_key and settings.telnyx_from_number):
            return DeliveryResult(success=False, error="Telnyx is not configured")

        try:
            async with httpx.AsyncClient(timeout=15) as client:
                response = await client.post(
                    _API_URL,
                    headers={"Authorization": f"Bearer {settings.telnyx_api_key}"},
                    json={
                        "from": settings.telnyx_from_number,
                        "to": message.destination_value,
                        "text": message.body_text,
                    },
                )
        except httpx.HTTPError as exc:
            return DeliveryResult(success=False, error=str(exc))

        data = response.json()
        if response.status_code >= 400:
            errors = data.get("errors") or []
            detail = errors[0].get("detail") if errors else response.text[:200]
            return DeliveryResult(
                success=False, error=f"Telnyx error {response.status_code}: {detail}"
            )
        return DeliveryResult(success=True, external_message_id=data.get("data", {}).get("id"))