import { ClientConfig, get } from "../client";

/// This function is a helper for paginating using a function wrapping an API
export async function paginateWithCursor<Req extends Record<string, any>, Res extends any[]>(options: {
  url: string;
  endpoint?: string;
  body?: any;
  params?: Req;
  originMethod?: string;
  overrides?: ClientConfig;
}): Promise<Res> {
  const out = [];
  let cursor: string | undefined;
  const requestParams = options.params as Req & { start?: string };
  // eslint-disable-next-line no-constant-condition
  while (true) {
    requestParams.start = cursor;
    // eslint-disable-next-line no-await-in-loop
    const response = await get<Req, Res>({
      url: options.url,
      endpoint: options.endpoint,
      params: requestParams,
      originMethod: options.originMethod,
      overrides: options.overrides,
    });
    // eslint-disable-next-line no-underscore-dangle
    /**
     * the cursor is a "state key" from the API prespective. Client
     * should not need to "care" what it represents but just use it
     * to query the next chunck of data.
     */
    cursor = response.headers["x-aptos-cursor"];
    // Now that we have the cursor (if any), we remove the headers before
    // adding these to the output of this function.
    // eslint-disable-next-line no-underscore-dangle
    delete (response as any).headers;
    out.push(...response.data);
    if (cursor === null || cursor === undefined) {
      break;
    }
  }
  return out as any;
}