SET search_path TO atlas, public;

-- 审核通过的规则只能由新版本替代；应用角色不能直接修改已经用于报价的运价。
CREATE FUNCTION guard_reviewed_logistics_mutation() RETURNS trigger LANGUAGE plpgsql SET search_path = atlas, public AS $$
DECLARE
    card_id UUID;
BEGIN
    IF TG_TABLE_NAME='logistics_rate_cards' THEN
        card_id := OLD.id;
    ELSIF TG_TABLE_NAME IN ('logistics_product_types','logistics_transport_methods') THEN
        IF TG_OP='DELETE' THEN card_id := OLD.rate_card_id;
        ELSE card_id := NEW.rate_card_id; END IF;
    ELSE
        IF TG_OP='DELETE' THEN
            SELECT rate_card_id INTO card_id FROM logistics_product_types WHERE id=OLD.product_type_id;
        ELSE
            SELECT rate_card_id INTO card_id FROM logistics_product_types WHERE id=NEW.product_type_id;
        END IF;
    END IF;
    IF card_id IS NOT NULL THEN
        PERFORM 1 FROM logistics_rate_cards WHERE id=card_id FOR SHARE;
        IF EXISTS (SELECT 1 FROM logistics_rate_card_reviews WHERE rate_card_id=card_id) THEN
            RAISE EXCEPTION '已审核的物流费率不可改写，请建立新版本' USING ERRCODE='23514';
        END IF;
    END IF;
    IF TG_OP='DELETE' THEN RETURN OLD; END IF;
    RETURN NEW;
END $$;

CREATE TRIGGER reviewed_card_immutable BEFORE UPDATE OR DELETE ON logistics_rate_cards
    FOR EACH ROW EXECUTE FUNCTION guard_reviewed_logistics_mutation();
CREATE TRIGGER reviewed_type_immutable BEFORE INSERT OR UPDATE OR DELETE ON logistics_product_types
    FOR EACH ROW EXECUTE FUNCTION guard_reviewed_logistics_mutation();
CREATE TRIGGER reviewed_method_immutable BEFORE INSERT OR UPDATE OR DELETE ON logistics_transport_methods
    FOR EACH ROW EXECUTE FUNCTION guard_reviewed_logistics_mutation();
CREATE TRIGGER reviewed_rule_immutable BEFORE INSERT OR UPDATE OR DELETE ON logistics_rate_rules
    FOR EACH ROW EXECUTE FUNCTION guard_reviewed_logistics_mutation();