/**
 * Structured ACME protocol error with RFC 8555 fields.
 * Provides type URN, subproblems, Retry-After, and retryability classification.
 */
export class AcmeError extends Error {
  public readonly status: number;
  public readonly type: string;
  public readonly detail: string;
  public readonly subproblems: Array<{ type: string; detail: string; identifier?: { type: string; value: string } }>;
  public readonly url: string;
  public readonly retryAfter: number;

  constructor(options: {
    message?: string;
    status: number;
    type?: string;
    detail?: string;
    subproblems?: Array<{ type: string; detail: string; identifier?: { type: string; value: string } }>;
    url?: string;
    retryAfter?: number;
  }) {
    const type = options.type || '';
    const detail = options.detail || '';
    const url = options.url || '';
    const msg =
      options.message ||
      `ACME error: ${type || 'unknown'} (HTTP ${options.status}) at ${url || 'unknown'} - ${detail || 'no detail'}`;
    super(msg);
    this.name = 'AcmeError';
    this.status = options.status;
    this.type = type;
    this.detail = detail;
    this.subproblems = options.subproblems || [];
    this.url = url;
    this.retryAfter = options.retryAfter || 0;
  }

  /**
   * True for HTTP 429 or ACME rateLimited type URN
   */
  get isRateLimited(): boolean {
    return this.status === 429 || this.type === 'urn:ietf:params:acme:error:rateLimited';
  }

  /**
   * True for transient/retryable errors: 429, 503, 5xx, badNonce.
   * False for definitive client errors: 400 (non-badNonce), 403, 404, 409.
   */
  get isRetryable(): boolean {
    if (this.type === 'urn:ietf:params:acme:error:badNonce') return true;
    if (this.status === 429 || this.status === 503) return true;
    if (this.status >= 500) return true;
    return false;
  }
}