import type { ObjectWithRequiredFields } from "@/types/object-with-required-fields";

type KeyValue = Record<string, unknown>;
type Keys<T> = Array<keyof T>;
type ValidateEmptyFields<T extends KeyValue> = [ObjectWithRequiredFields<T> | undefined, Error | null];

export const validateEmptyFields = <T extends KeyValue>(record: T, keys: Keys<T> = []): ValidateEmptyFields<T> => {
  for (const key of keys) {
    if (!record[key]) {
      return [undefined, new Error(`field <${key as string}> is empty`)];
    }
  }

  return [record as ObjectWithRequiredFields<T>, null];
};