"""Definition of verify_child_access function."""

from fastapi import HTTPException
from baby_monitor.repositories.interfaces import (
    ChildRepositoryInterface,
)


def verify_child_access(
    child_repo: ChildRepositoryInterface, child_id: int, user_id: int
) -> None:
    """Verify that user has access to the child.

    Args:
        child_repo: Child repository instance
        child_id: ID of the child to verify access for
        user_id: ID of the user requesting access

    Raises:
        HTTPException: 404 if child not found, 403 if user is not a parent
    """
    child = child_repo.get_by_id(child_id)
    if not child:
        raise HTTPException(status_code=404, detail="Child not found")

    parent_ids = child_repo.get_parent_ids(child_id)
    if user_id not in parent_ids:
        raise HTTPException(status_code=403, detail="Access denied to this child")