import type { ProblemDetails } from "../../contracts/studio/contract.ts";

export class StudioGatewayError extends Error {
  readonly problem: ProblemDetails;
  readonly status: number;
  readonly code: ProblemDetails["code"];
  readonly retryable: boolean;

  constructor(problem: ProblemDetails, options?: ErrorOptions) {
    super(problem.detail, options);
    this.name = "StudioGatewayError";
    this.problem = problem;
    this.status = problem.status;
    this.code = problem.code;
    this.retryable = problem.retryable ?? false;
  }
}

export function isStudioGatewayError(value: unknown): value is StudioGatewayError {
  if (typeof value !== "object" || value === null) return false;
  const candidate = value as Partial<StudioGatewayError>;
  return (
    typeof candidate.message === "string" &&
    typeof candidate.status === "number" &&
    typeof candidate.code === "string" &&
    typeof candidate.retryable === "boolean" &&
    typeof candidate.problem === "object" &&
    candidate.problem !== null &&
    candidate.problem.status === candidate.status &&
    candidate.problem.code === candidate.code
  );
}