import { base64FromArrayBuffer } from "../base64.js";
import { stringToBytes } from "../taler-crypto.js";
import { AccessToken, TalerAuthentication } from "./types.js";

/**
 * Helper function to generate the "Authorization" HTTP header.
 */
export function makeBasicAuthHeader(username: string, password: string): string {
  const auth = `${username}:${password}`;
  const authEncoded: string = base64FromArrayBuffer(stringToBytes(auth));
  return `Basic ${authEncoded}`;
}

/**
 * rfc8959
 * @param token 
 * @returns 
 */
export function makeBearerTokenAuthHeader(token: AccessToken): string {
  return `Bearer secret-token:${token}`;
}

/**
 * https://bugs.gnunet.org/view.php?id=7949
 */
export function addPaginationParams(url: URL, pagination?: PaginationParams) {
  if (!pagination) return;
  if (pagination.timoutMs) {
    url.searchParams.set("long_poll_ms", String(pagination.timoutMs))
  }
  if (pagination.offset) {
    url.searchParams.set("start", pagination.offset)
  }
  if (pagination.limit) {
    url.searchParams.set("delta", String(pagination.limit))
  }
}

export type UserAndPassword = {
  username: string,
  password: string,
}

export type UserAndToken = {
  username: string,
  token: AccessToken,
}

export type PaginationParams = {
  /**
   * row identifier as the starting point of the query
   */
  offset?: string,
  /**
   * max number of element in the result response
   */
  limit?: number,
  /**
   * milliseconds the server should wait for at least one result to be shown
   */
  timoutMs?: number,
}