code/self_healing_finetuning/approvals/policy.py

from __future__ import annotations


def required_approvals(env: str, risk_tier: str) -> set[str]:
    required: set[str] = set()
    if env in {"stage", "prod"}:
        required.add("engineering")
    if env == "prod":
        required.add("product_owner")
    if risk_tier in {"regulated_internal", "external_facing"}:
        required.add("compliance")
    if risk_tier == "external_facing":
        required.add("product_owner")
    return required


def validate_approvals(approvals: dict[str, str], *, env: str, risk_tier: str) -> list[str]:
    missing = [role for role in sorted(required_approvals(env, risk_tier)) if approvals.get(role) != "approved"]
    return [f"missing approval: {role}" for role in missing]