from tht.mschema.models import Annotations, PhysicalSchema


def find_orphans(physical: PhysicalSchema, annotations: Annotations) -> list[str]:
    """Annotazioni che puntano a oggetti spariti dal fisico. Non le rimuove mai."""
    orphans: list[str] = []
    for table_name, table_ann in annotations.tables.items():
        table = physical.tables.get(table_name)
        if table is None:
            orphans.append(table_name)
            continue
        for column_name in table_ann.columns:
            if column_name not in table.columns:
                orphans.append(f"{table_name}.{column_name}")
        for fk in table_ann.foreign_keys:
            label = f"{table_name}.fk({','.join(fk.columns)})->{fk.ref_table}"
            ref = physical.tables.get(fk.ref_table)
            if ref is None:
                orphans.append(label)
                continue
            missing = [c for c in fk.columns if c not in table.columns]
            missing += [c for c in fk.ref_columns if c not in ref.columns]
            if missing:
                orphans.append(label)
    return orphans