@ledgerhq/coin-hedera/lib-es/bridge/estimateMaxSpendable.js

Ledger Hedera Coin integration

import { isTokenAccount } from "@ledgerhq/ledger-wallet-framework/account/helpers";
import { getMainAccount } from "@ledgerhq/ledger-wallet-framework/account/index";
import BigNumber from "bignumber.js";
import { HEDERA_OPERATION_TYPES } from "../constants";
import { estimateFees } from "../logic/estimateFees";
export const estimateMaxSpendable = async ({ account, parentAccount, }) => {
    const mainAccount = getMainAccount(account, parentAccount);
    const isTokenTransaction = isTokenAccount(account);
    const balance = account.balance;
    if (isTokenTransaction) {
        return Promise.resolve(balance);
    }
    const estimatedFees = await estimateFees({
        currency: mainAccount.currency,
        operationType: HEDERA_OPERATION_TYPES.CryptoTransfer,
    });
    let maxSpendable = balance.minus(estimatedFees.tinybars);
    // set max spendable to 0 if negative
    // for cases where the user's account balance is smaller than the estimated fee
    if (maxSpendable.isLessThan(0)) {
        maxSpendable = new BigNumber(0);
    }
    return Promise.resolve(maxSpendable);
};
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