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/*
This file is part of GNU Taler
(C) 2022-2024 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/>
*/
import { useState } from "preact/hooks";
// FIX default import https://github.com/microsoft/TypeScript/issues/49189
import {
OfficerAccount,
OperationOk,
TalerExchangeApi,
TalerExchangeResultByMethod,
TalerHttpError,
} from "@gnu-taler/taler-util";
import _useSWR, { SWRHook } from "swr";
import { useOfficer } from "./officer.js";
import { useExchangeApiContext } from "@gnu-taler/web-util/browser";
const useSWR = _useSWR as unknown as SWRHook;
export const PAGINATED_LIST_SIZE = 10;
// when doing paginated request, ask for one more
// and use it to know if there are more to request
export const PAGINATED_LIST_REQUEST = PAGINATED_LIST_SIZE + 1;
/**
* FIXME: mutate result when balance change (transaction )
* @param account
* @param args
* @returns
*/
export function useCases(state: TalerExchangeApi.AmlState) {
const officer = useOfficer();
const session = officer.state === "ready" ? officer.account : undefined;
const {
lib: { exchange: api },
} = useExchangeApiContext();
const [offset, setOffset] = useState<string>();
async function fetcher([officer, state, offset]: [
OfficerAccount,
TalerExchangeApi.AmlState,
string | undefined,
]) {
return await api.getDecisionsByState(officer, state, {
order: "asc",
offset,
limit: PAGINATED_LIST_REQUEST,
});
}
const { data, error } = useSWR<
TalerExchangeResultByMethod<"getDecisionsByState">,
TalerHttpError
>(
!session ? undefined : [session, state, offset, "getDecisionsByState"],
fetcher,
);
if (error) return error;
if (data === undefined) return undefined;
if (data.type !== "ok") return data;
return buildPaginatedResult(data.body.records, offset, setOffset, (d) =>
String(d.rowid),
);
}
type PaginatedResult<T> = OperationOk<T> & {
isLastPage: boolean;
isFirstPage: boolean;
loadNext(): void;
loadFirst(): void;
};
//TODO: consider sending this to web-util
export function buildPaginatedResult<R, OffId>(
data: R[],
offset: OffId | undefined,
setOffset: (o: OffId | undefined) => void,
getId: (r: R) => OffId,
): PaginatedResult<R[]> {
const isLastPage = data.length < PAGINATED_LIST_REQUEST;
const isFirstPage = offset === undefined;
const result = structuredClone(data);
if (result.length == PAGINATED_LIST_REQUEST) {
result.pop();
}
return {
type: "ok",
body: result,
isLastPage,
isFirstPage,
loadNext: () => {
if (!result.length) return;
const id = getId(result[result.length - 1]);
setOffset(id);
},
loadFirst: () => {
setOffset(undefined);
},
};
}
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