// schema -> property name -> display name
type Mapping = Record<string, Record<string, string>>;

const proxySymbol = Symbol("proxy");
export function ProxyFactory(map: Mapping) {
  const make = <T>(record: T) => {
    if (typeof record !== "object" || record === null) {
      return record;
    }
    if (record[proxySymbol]) {
      return record;
    }
    const kind = record["__typename"];
    if (!kind) return record;
    const fields = map[kind];
    if (!fields) return record;
    return new Proxy(record, {
      get(target, prop, receiver) {
        if (prop === proxySymbol) {
          return true;
        }
        if (prop in fields) {
          const key = fields[prop as string];
          return target[key];
        }
        const v = Reflect.get(target, prop, receiver);
        return make(v);
      },
    }) as T;
  };
  return make;
}