@ledgerhq/live-common/lib-es/exchange/swap/hooks/usePickDefaultCurrency.js

Common ground for the Ledger Live apps

import { useEffect } from "react";
import { currenciesByMarketcap } from "../../../currencies";
// Pick a default currency target if none are selected.
export const usePickDefaultCurrency = (currencies, currency, setCurrency) => {
    useEffect(() => {
        // Keep the same currency target if it is still valid.
        const isCurrencyValid = currency && currencies.indexOf(currency) >= 0;
        if (!currency || !isCurrencyValid) {
            const defaultCurrency = currencies.find(currency => currency.id === "ethereum" || currency.id === "bitcoin");
            if (defaultCurrency) {
                setCurrency(defaultCurrency);
            }
            else if (currencies.length > 0) {
                currenciesByMarketcap(currencies).then(sortedCurrencies => {
                    setCurrency(sortedCurrencies[0]);
                });
            }
        }
    }, [currency, currencies, setCurrency]);
};
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