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Diffstat (limited to 'packages/taler-wallet-webextension/src/hooks/useSelectedExchange.ts')
-rw-r--r-- | packages/taler-wallet-webextension/src/hooks/useSelectedExchange.ts | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/packages/taler-wallet-webextension/src/hooks/useSelectedExchange.ts b/packages/taler-wallet-webextension/src/hooks/useSelectedExchange.ts new file mode 100644 index 000000000..d9085153e --- /dev/null +++ b/packages/taler-wallet-webextension/src/hooks/useSelectedExchange.ts @@ -0,0 +1,125 @@ +/* + 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 + } +} |