export const AiErrorCodes = {
  AI_CONFIG_MISSING: 4501,
  AI_FUNC_NOT_FOUND: 4502,
  AI_INPUT_INVALID: 4503,
  AI_OUTPUT_INVALID: 4504,
  AI_UPSTREAM_ERROR: 4505,
  AI_UPSTREAM_TIMEOUT: 4506,
  AI_RATE_LIMITED: 4507,
  AI_KB_PATH_INVALID: 4511,
  AI_KB_NOT_FOUND: 4512,
  AI_CHAT_INPUT_INVALID: 4513,
  /** 助手工具声明/注册不合法:重名、越上限、坏 tool.yaml、执行体装载失败。 */
  AI_TOOL_DECL_INVALID: 4514,
} as const;

export type AiErrorCode = (typeof AiErrorCodes)[keyof typeof AiErrorCodes];

export class AiApiError extends Error {
  readonly code: AiErrorCode;

  constructor(code: AiErrorCode, message: string, options?: ErrorOptions) {
    super(message, options);
    this.name = 'AiApiError';
    this.code = code;
  }
}

export function isAbortError(error: unknown): boolean {
  return error instanceof Error && (error.name === 'AbortError' || error.name === 'TimeoutError');
}