@ledgerhq/coin-ton/lib-es/estimateMaxSpendable.js

Ton Coin integration

import { getMainAccount, isTokenAccount } from "@ledgerhq/coin-framework/account/index";
import { BigNumber } from "bignumber.js";
import { fetchAccountInfo } from "./bridge/bridgeHelpers/api";
import { buildTonTransaction, findSubAccountById, getTonEstimatedFees } from "./utils";
const estimateMaxSpendable = async ({ account, parentAccount, transaction, }) => {
    const mainAccount = getMainAccount(account, parentAccount);
    let balance = mainAccount.spendableBalance;
    if (balance.eq(0))
        return balance;
    const accountInfo = await fetchAccountInfo(mainAccount.freshAddress);
    const isTokenType = isTokenAccount(account);
    if (transaction && !transaction.subAccountId) {
        transaction.subAccountId = isTokenType ? account.id : null;
    }
    let tokenAccountTxn = false;
    let subAccount;
    if (isTokenType) {
        tokenAccountTxn = true;
        subAccount = account;
    }
    if (transaction?.subAccountId && !subAccount) {
        tokenAccountTxn = true;
        subAccount = findSubAccountById(mainAccount, transaction.subAccountId || "") ?? null;
    }
    if (tokenAccountTxn && subAccount) {
        return subAccount.spendableBalance;
    }
    let estimatedFees = BigNumber(0);
    if (transaction) {
        const tonTx = buildTonTransaction(transaction, accountInfo.seqno, mainAccount);
        estimatedFees = await getTonEstimatedFees(mainAccount, accountInfo.status === "uninit", tonTx);
    }
    if (balance.lte(estimatedFees))
        return new BigNumber(0);
    balance = balance.minus(estimatedFees);
    return balance;
};
export default estimateMaxSpendable;
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