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/*
This file is part of GNU Taler
(C) 2022 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 { ExchangeListItem } from "@gnu-taler/taler-util";
import { useState } from "preact/hooks";
import { ButtonHandler } from "../mui/handlers.js";
type State = State.Ready | State.NoExchange | State.Selecting;
export namespace State {
export interface NoExchange {
status: "no-exchange"
error: undefined;
}
export interface Ready {
status: "ready",
doSelect: ButtonHandler,
selected: ExchangeListItem;
}
export interface Selecting {
status: "selecting-exchange",
error: undefined,
onSelection: (url: string) => Promise<void>;
onCancel: () => Promise<void>;
list: ExchangeListItem[],
currency: string;
currentExchange: string;
}
}
interface Props {
currency: string;
//there is a preference for the default at the initial state
defaultExchange?: string,
//list of exchanges
list: ExchangeListItem[],
}
export function useSelectedExchange({ currency, defaultExchange, list }: Props): State {
const [isSelecting, setIsSelecting] = useState(false);
const [selectedExchange, setSelectedExchange] = useState<string | undefined>(undefined);
if (!list.length) {
return {
status: "no-exchange",
error: undefined,
}
}
const firstByCurrency = list.find((e) => e.currency === currency)
if (!firstByCurrency) {
// there should be at least one exchange for this currency
return {
status: "no-exchange",
error: undefined,
}
}
if (isSelecting) {
const currentExchange = selectedExchange ?? defaultExchange ?? firstByCurrency.exchangeBaseUrl;
return {
status: "selecting-exchange",
error: undefined,
list,
currency,
currentExchange: currentExchange,
onSelection: async (exchangeBaseUrl: string) => {
setIsSelecting(false);
setSelectedExchange(exchangeBaseUrl)
},
onCancel: async () => {
setIsSelecting(false);
}
}
}
{
const found = !selectedExchange ? undefined : list.find(
(e) => e.exchangeBaseUrl === selectedExchange,
)
if (found) return {
status: "ready",
doSelect: {
onClick: async () => setIsSelecting(true)
},
selected: found
};
}
{
const found = !defaultExchange ? undefined : list.find(
(e) => e.exchangeBaseUrl === defaultExchange,
)
if (found) return {
status: "ready",
doSelect: {
onClick: async () => setIsSelecting(true)
},
selected: found
};
}
return {
status: "ready",
doSelect: {
onClick: async () => setIsSelecting(true)
},
selected: firstByCurrency
}
}
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