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import { useState } from "preact/hooks";
// FIX default import https://github.com/microsoft/TypeScript/issues/49189
import { OfficerAccount, OfficerId, OperationOk, TalerExchangeResultByMethod, TalerHttpError, decodeCrock, encodeCrock } from "@gnu-taler/taler-util";
import _useSWR, { SWRHook } from "swr";
import { useExchangeApiContext } from "../context/config.js";
import { AmlExchangeBackend } from "../utils/types.js";
import { useOfficer } from "./useOfficer.js";
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: AmlExchangeBackend.AmlState) {
const officer = useOfficer();
const session = officer.state === "ready" ? officer.account : undefined;
const { api } = useExchangeApiContext();
const [offset, setOffset] = useState<string>();
async function fetcher([officer, state, offset]: [OfficerAccount, AmlExchangeBackend.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);
},
};
}
function removeLastElement<T>(list: Array<T>): Array<T> {
if (list.length === 0) {
return list;
}
return list.slice(0, -1)
}
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