"""Conservative deterministic role, ST, and inbound scope resolution."""


def resolve_product_role(signals: dict) -> dict:
    if signals.get("recipe") and signals.get("production"):
        return {"value": "OWN_PRODUCTION", "status": "CONFIRMED", "evidence": ["recipe", "production"]}
    if signals.get("purchase") and signals.get("sale") and not signals.get("recipe"):
        return {"value": "RESALE", "status": "CONFIRMED", "evidence": ["purchase", "sale"]}
    if signals.get("input_consumed") and signals.get("recipe"):
        return {"value": "INPUT", "status": "CONFIRMED", "evidence": ["input_consumed", "recipe"]}
    if signals.get("service_flag") and signals.get("service_transactions"):
        return {"value": "SERVICE", "status": "CONFIRMED", "evidence": ["service_flag", "service_transactions"]}
    return {"value": None, "status": "PENDING_PRODUCT_ROLE", "evidence": []}


def resolve_st_status(signals: dict) -> dict:
    if not signals.get("official_cest"):
        return {"value": "NOT_SUBJECT_TO_ST", "status": "CONFIRMED", "evidence": []}
    if signals.get("purchase_retained") is True:
        return {"value": "ST_ALREADY_WITHHELD_IN_PURCHASE", "status": "CONFIRMED", "evidence": ["official_cest", "purchase_retained"]}
    if signals.get("purchase_retained") is False:
        return {"value": "PRODUCT_SUBJECT_TO_ST", "status": "CONFIRMED", "evidence": ["official_cest", "purchase_not_retained"]}
    return {"value": None, "status": "PENDING_ST_WITHHELD", "evidence": ["official_cest"]}


def resolve_entry_scope(supplier_ufs: list[str], company_uf: str) -> dict:
    observed = {str(uf).strip().upper() for uf in supplier_ufs if uf}
    if not observed:
        return {"value": None, "status": "PENDING_ENTRY_SCOPE", "evidence": []}
    if len(observed - {company_uf.upper()}) and company_uf.upper() in observed:
        value = "MIXED_OR_DYNAMIC"
    elif observed - {company_uf.upper()}:
        value = "INTER"
    else:
        value = "INTRA"
    return {"value": value, "status": "CONFIRMED", "evidence": sorted(observed)}