/*
 This file is part of GNU Taler
 (C) 2021 Taler Systems S.A.

 GNU 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.

 GNU 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
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/
import { useState } from "preact/hooks";
import { cancelPendingRequest } from "./backend.js";

export interface Options {
  slowTolerance: number,
}

export interface AsyncOperationApi<T> {
  request: (...a: any) => void,
  cancel: () => void,
  data: T | undefined,
  isSlow: boolean,
  isLoading: boolean,
  error: string | undefined
}

export function useAsync<T>(fn?: (...args: any) => Promise<T>, { slowTolerance: tooLong }: Options = { slowTolerance: 1000 }): AsyncOperationApi<T> {
  const [data, setData] = useState<T | undefined>(undefined);
  const [isLoading, setLoading] = useState<boolean>(false);
  const [error, setError] = useState<any>(undefined);
  const [isSlow, setSlow] = useState(false)

  const request = async (...args: any) => {
    if (!fn) return;
    setLoading(true);

    const handler = setTimeout(() => {
      setSlow(true)
    }, tooLong)

    try {
      const result = await fn(...args);
      setData(result);
    } catch (error) {
      setError(error);
    }
    setLoading(false);
    setSlow(false)
    clearTimeout(handler)
  };

  function cancel() {
    cancelPendingRequest()
    setLoading(false);
    setSlow(false)
  }

  return {
    request,
    cancel,
    data,
    isSlow,
    isLoading,
    error
  };
}