export type RedeemErrorCode =
  | "invalid_code"
  | "expired_code"
  | "already_redeemed"
  | "account_not_eligible"
  | "rate_limited"
  | "system_error";

export type RedeemErrorResponse = {
  status: number;
  message: string;
  code: RedeemErrorCode;
};

/**
 * Maps a redeem_code RPC error_code to a stable API error contract.
 * revoked_code is normalized to invalid_code (the stable code set has no
 * revoked variant). Unknown or system-side error codes collapse to
 * system_error. account_not_eligible is kept as a mapping only: there is no
 * account-eligibility restriction model, so no check is fabricated.
 */
export function redeemErrorResponse(errorCode: string): RedeemErrorResponse {
  switch (errorCode) {
    case "expired_code":
      return { status: 410, message: "兑换码已过期", code: "expired_code" };
    case "already_redeemed":
      return { status: 409, message: "兑换码已被使用", code: "already_redeemed" };
    case "account_not_eligible":
      return { status: 403, message: "该兑换码不适用于当前账户", code: "account_not_eligible" };
    case "rate_limited":
      return { status: 429, message: "请求过于频繁", code: "rate_limited" };
    case "revoked_code":
      return { status: 404, message: "兑换码已撤销", code: "invalid_code" };
    case "invalid_code":
      return { status: 404, message: "兑换码不存在", code: "invalid_code" };
    case "profile_missing":
      return { status: 500, message: "系统异常，请稍后重试", code: "system_error" };
    default:
      return { status: 500, message: "系统异常，请稍后重试", code: "system_error" };
  }
}

export function redeemInputErrorResponse(): RedeemErrorResponse {
  return { status: 400, message: "请输入有效兑换码", code: "invalid_code" };
}