/*
 This file is part of TALER
 (C) 2016 GNUnet e.V.

 TALER is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 TALER is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */
import { ExchangesListRespose } from "@gnu-taler/taler-util";
import { useEffect, useState } from "preact/hooks";
import * as wxApi from "../wxApi";

interface HookOk<T> {
  hasError: false;
  response: T;
}

interface HookError {
  hasError: true;
  message: string;
}

export type HookResponse<T> = HookOk<T> | HookError | undefined;

export function useAsyncAsHook<T> (fn: (() => Promise<T>)): HookResponse<T> {
  const [result, setHookResponse] = useState<HookResponse<T>>(undefined);
  useEffect(() => {
    async function doAsync() {
      try {
        const response = await fn();
        setHookResponse({ hasError: false, response });
      } catch (e) {
        if (e instanceof Error) {
          setHookResponse({ hasError: true, message: e.message });
        }
      }
    }
    doAsync()
  }, []);
  return result;
}