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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);
+ },
+ };
+}