export type MessageSendErrorCode = "connection-unavailable" | "no-active-session";

export class MessageSendError extends Error {
  readonly code: MessageSendErrorCode;

  constructor(code: MessageSendErrorCode, message: string) {
    super(message);
    this.name = "MessageSendError";
    this.code = code;
  }
}

export function isMessageSendError(error: unknown): error is MessageSendError {
  if (!(error instanceof Error) || error.name !== "MessageSendError") return false;
  const code = (error as Error & { code?: unknown }).code;
  return code === "connection-unavailable" || code === "no-active-session";
}