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metamask-extension/ui/app/hooks/useEthFiatAmount.js

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2020-10-06 20:28:38 +02:00
import { useMemo } from 'react'
import { useSelector } from 'react-redux'
import { getConversionRate, getCurrentCurrency, getShouldShowFiat } from '../selectors'
import { decEthToConvertedCurrency } from '../helpers/utils/conversions.util'
import { formatCurrency } from '../helpers/utils/confirm-tx.util'
/**
* Get an Eth amount converted to fiat and formatted for display
*
* @param {string} [tokenAmount] - The eth amount to convert
* @param {object} [overrides] - A configuration object that allows the called to explicitly
* ensure fiat is shown even if the property is not set in state.
* @param {boolean} [overrides.showFiat] - If truthy, ensures the fiat value is shown even if the showFiat value from state is falsey
* @param {boolean} hideCurrencySymbol Indicates whether the returned formatted amount should include the trailing currency symbol
* @return {string} - The formatted token amount in the user's chosen fiat currency
*/
export function useEthFiatAmount (ethAmount, overrides = {}, hideCurrencySymbol) {
const conversionRate = useSelector(getConversionRate)
const currentCurrency = useSelector(getCurrentCurrency)
const userPrefersShownFiat = useSelector(getShouldShowFiat)
const showFiat = overrides.showFiat ?? userPrefersShownFiat
const formattedFiat = useMemo(
() => decEthToConvertedCurrency(ethAmount, currentCurrency, conversionRate),
[conversionRate, currentCurrency, ethAmount],
)
if (!showFiat || currentCurrency.toUpperCase() === 'ETH' || conversionRate <= 0 || ethAmount === undefined) {
return undefined
}
return hideCurrencySymbol
? formatCurrency(formattedFiat, currentCurrency)
: `${formatCurrency(formattedFiat, currentCurrency)} ${currentCurrency.toUpperCase()}`
}