EXTERNAL_SCOPE_FILTER = {
    "$or": [
        {"message_scope": "EXTERNAL"},
        {"message_scope": {"$exists": False}},
    ]
}


def apply_external_scope(entry_match: dict) -> dict:
    if "$and" in entry_match:
        entry_match["$and"].append(EXTERNAL_SCOPE_FILTER)
        return entry_match
    if "$or" in entry_match:
        existing = entry_match.pop("$or")
        entry_match["$and"] = [{"$or": existing}, EXTERNAL_SCOPE_FILTER]
        return entry_match
    entry_match.update(EXTERNAL_SCOPE_FILTER)
    return entry_match