SET search_path TO atlas, public;

-- 更新规则归属时同时检查原费率卡和目标费率卡，避免把已审核规则移出后改写。
CREATE OR REPLACE FUNCTION guard_reviewed_logistics_mutation() RETURNS trigger LANGUAGE plpgsql SET search_path = atlas, public AS $$
DECLARE
    old_card_id UUID;
    new_card_id UUID;
    current_card_id UUID;
BEGIN
    IF TG_TABLE_NAME='logistics_rate_cards' THEN
        old_card_id := OLD.id;
    ELSIF TG_TABLE_NAME IN ('logistics_product_types','logistics_transport_methods') THEN
        IF TG_OP<>'INSERT' THEN old_card_id := OLD.rate_card_id; END IF;
        IF TG_OP<>'DELETE' THEN new_card_id := NEW.rate_card_id; END IF;
    ELSE
        IF TG_OP<>'INSERT' THEN
            SELECT rate_card_id INTO old_card_id FROM logistics_product_types WHERE id=OLD.product_type_id;
        END IF;
        IF TG_OP<>'DELETE' THEN
            SELECT rate_card_id INTO new_card_id FROM logistics_product_types WHERE id=NEW.product_type_id;
        END IF;
    END IF;
    FOR current_card_id IN SELECT DISTINCT id FROM (VALUES(old_card_id),(new_card_id)) AS ids(id) WHERE id IS NOT NULL LOOP
        PERFORM 1 FROM logistics_rate_cards WHERE id=current_card_id FOR SHARE;
        IF EXISTS (SELECT 1 FROM logistics_rate_card_reviews WHERE rate_card_id=current_card_id) THEN
            RAISE EXCEPTION '已审核的物流费率不可改写，请建立新版本' USING ERRCODE='23514';
        END IF;
    END LOOP;
    IF TG_OP='DELETE' THEN RETURN OLD; END IF;
    RETURN NEW;
END $$;