import { HTTPError } from "ky";

export interface ApiError {
  /**
   * Client error response status code
   */
  status: number;
  /**
   * Error message
   */
  message: string;
}

/**
 * Helper function that calls Ky and manages its errors;
 * @returns A tuple [data, error] in Golang-like fashion
 */
export async function callApi<T>(
  fn: () => Promise<T>,
): Promise<[T, null] | [null, ApiError]> {
  try {
    const data = await fn();
    return [data, null];
  } catch (error) {
    if (error instanceof HTTPError) {
      const body = await error.response.json<{ message: string }>();
      return [null, { status: error.response.status, message: body.message }];
    }

    // re-throw unexpected errors
    throw error;
  }
}