/**
  * Parse error messages for a specific input.
  *
  * @param inputName string
  * @param allErrors Record<string, Array<string>>
  * @return string
  */
export function parseValidationErrors(
  allErrors: Record<string, Array<string>> = {}
): string | null {
  const errorList = Object.values(allErrors);
  if (!errorList.length) {
    return null;
  }
  return errorList
    .flat()
    .reduce(
      (oldInputString: string | null, inputString: string) =>
        (oldInputString ? `${oldInputString}, ` : "") +
                        inputString,
      null
    );
}

/**
  * Parse error messages for a specific input.
  *
  * @param inputName string
  * @param allErrors Record<string, Array<string>>
  * @return string
  */
export function parseValidationInput(
  inputName: string,
  allErrors: Record<string, Array<string>> = {}
): string | null {
  let errorList = [] as Array<string>;
  for (const value of Object.keys(allErrors)) {
    if (value == inputName) {
      errorList = allErrors[inputName];
    }
  }
  return errorList.length
    ? errorList.reduce((oldString: string | null, string) => {
      return (oldString ? `${oldString}, ` : "") + string;
    }, null)
    : null;
}