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22 lines
613 B
JavaScript
22 lines
613 B
JavaScript
import ethUtil from 'ethereumjs-util'
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import {
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multiplyCurrencies,
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subtractCurrencies,
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} from '../../../../../helpers/utils/conversion-util'
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export function calcMaxAmount({ balance, gasTotal, sendToken, tokenBalance }) {
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const { decimals } = sendToken || {}
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const multiplier = Math.pow(10, Number(decimals || 0))
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return sendToken
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? multiplyCurrencies(tokenBalance, multiplier, {
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toNumericBase: 'hex',
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multiplicandBase: 16,
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})
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: subtractCurrencies(
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ethUtil.addHexPrefix(balance),
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ethUtil.addHexPrefix(gasTotal),
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{ toNumericBase: 'hex' },
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)
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}
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