/**
 * Typed API error with automatic HTTP response conversion.
 * Mirrors `apps/interfaces/api/src/error.rs`.
 *
 * Each kind maps to a status code:
 * - BadRequest → 400
 * - Unauthorized → 401
 * - NotFound → 404
 * - Conflict → 409
 * - TooManyRequests → 429
 * - Internal → 500
 * - ChatProxy → 502
 */

export type ApiErrorKind =
  | "BadRequest"
  | "Unauthorized"
  | "NotFound"
  | "Conflict"
  | "TooManyRequests"
  | "Internal"
  | "ChatProxy";

export const HTTP_STATUS: Record<ApiErrorKind, number> = {
  BadRequest: 400,
  Unauthorized: 401,
  NotFound: 404,
  Conflict: 409,
  TooManyRequests: 429,
  Internal: 500,
  ChatProxy: 502,
};

export class ApiError extends Error {
  constructor(public kind: ApiErrorKind, message: string) {
    super(message);
    this.name = "ApiError";
  }

  get status(): number {
    return HTTP_STATUS[this.kind];
  }

  static badRequest(msg: string): ApiError {
    return new ApiError("BadRequest", msg);
  }
  static unauthorized(msg: string): ApiError {
    return new ApiError("Unauthorized", msg);
  }
  static notFound(msg: string): ApiError {
    return new ApiError("NotFound", msg);
  }
  static conflict(msg: string): ApiError {
    return new ApiError("Conflict", msg);
  }
  static tooManyRequests(msg: string): ApiError {
    return new ApiError("TooManyRequests", msg);
  }
  static internal(msg: string): ApiError {
    return new ApiError("Internal", msg);
  }
  static chatProxy(msg: string): ApiError {
    return new ApiError("ChatProxy", msg);
  }

  /** Whether an internal error's details should be hidden from the client. */
  get exposeDetails(): boolean {
    // Internal errors hide details; all others surface the message.
    return this.kind !== "Internal";
  }
}