"""Lógica de los datos fiscales del emisor.

Una empresa tiene, a lo más, una configuración vigente: el guardado es un upsert, no
un alta que pueda duplicar filas.
"""

from fastapi import HTTPException, status
from sqlalchemy.orm import Session

from ..catalogs.models import TaxRegime
from .dto import IssuerSettingsInput
from .models import IssuerSettings


def _find(db: Session, tenant_id: int, company_id: int) -> IssuerSettings | None:
    return db.query(IssuerSettings).filter(
        IssuerSettings.tenant_id == tenant_id,
        IssuerSettings.company_id == company_id,
        IssuerSettings.deleted_at.is_(None),
    ).first()


def get_issuer_settings(db: Session, tenant_id: int, company_id: int) -> IssuerSettings:
    obj = _find(db, tenant_id, company_id)
    if not obj:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="La empresa aún no tiene datos fiscales del emisor configurados",
        )
    return obj


def save_issuer_settings(
    db: Session,
    payload: IssuerSettingsInput,
    tenant_id: int,
    company_id: int,
    user_id: str | None = None,
) -> IssuerSettings:
    """Crea la configuración la primera vez y la actualiza en adelante."""
    if db.query(TaxRegime.id).filter(TaxRegime.id == payload.tax_regime_id).first() is None:
        raise HTTPException(
            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
            detail="El régimen fiscal indicado no existe en el catálogo del SAT",
        )

    obj = _find(db, tenant_id, company_id)
    data = payload.model_dump()
    if obj is None:
        obj = IssuerSettings(**data, tenant_id=tenant_id, company_id=company_id, updated_by=user_id)
        db.add(obj)
    else:
        for field, value in data.items():
            setattr(obj, field, value)
        obj.updated_by = user_id
    db.commit()
    db.refresh(obj)
    return obj