"""Resolve the phone selector once, keeping the backend credential server-side."""

import httpx
from pydantic import ValidationError

from vocero_api.core import config as settings
from vocero_api.models.mcp import BackendLogin, IntegrationError


async def login(phone_number: str) -> BackendLogin:
    if not settings.S2S_LOGIN_BY_PHONE:
        raise IntegrationError(503, "El acceso por teléfono no está configurado.")
    try:
        async with httpx.AsyncClient(timeout=10, follow_redirects=False) as client:
            response = await client.post(settings.S2S_LOGIN_BY_PHONE, json={"phoneNumber": phone_number})
        if response.status_code in {401, 403, 404, 422}:
            raise IntegrationError(401, "No se pudo iniciar sesión con este número de teléfono.")
        response.raise_for_status()
        return BackendLogin.model_validate(response.json())
    except (httpx.HTTPError, ValidationError, ValueError) as exc:
        raise IntegrationError(502, "No se pudo validar la sesión con AquaPortal.") from exc