"""# Summary

Pets persistence ports — integer-id document and repository factory.
"""
from mongo_ops import BaseDocument
from pydantic import Field

from domain.pets.models import Pet
from infra.db.repos import create_repo


class PetDocument(Pet, BaseDocument):
    """Persisted pet document. The integer ``id`` shadows the ObjectId."""

    id: int | None = Field(default=None, validation_alias="_id")


def create_pet_repo():
    """Create the pet repository selected by ``settings.repo_backend``.

    Returns:
        IntIdMemoryRepository | IntIdMongoRepository: Repository wired to the
        ``pets`` collection/store.
    """
    return create_repo("pets", PetDocument)