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import currencyFormatter from 'currency-formatter'
import currencies from 'currency-formatter/currencies'
import abi from 'human-standard-token-abi'
import abiDecoder from 'abi-decoder'
import ethUtil from 'ethereumjs-util'
import BigNumber from 'bignumber.js'
abiDecoder.addABI(abi)
import MethodRegistry from 'eth-method-registry'
const registry = new MethodRegistry({ provider: global.ethereumProvider })
import {
conversionUtil,
addCurrencies,
multiplyCurrencies,
conversionGreaterThan,
} from '../../conversion-util'
import { unconfirmedTransactionsCountSelector } from '../../selectors/confirm-transaction'
export function getTokenData (data = {}) {
return abiDecoder.decodeMethod(data)
}
export async function getMethodData (data = {}) {
const prefixedData = ethUtil.addHexPrefix(data)
const fourBytePrefix = prefixedData.slice(0, 10)
const sig = await registry.lookup(fourBytePrefix)
const parsedResult = registry.parse(sig)
return {
name: parsedResult.name,
params: parsedResult.args,
}
}
export function increaseLastGasPrice (lastGasPrice) {
return ethUtil.addHexPrefix(multiplyCurrencies(lastGasPrice, 1.1, {
multiplicandBase: 16,
multiplierBase: 10,
toNumericBase: 'hex',
}))
}
export function hexGreaterThan (a, b) {
return conversionGreaterThan(
{ value: a, fromNumericBase: 'hex' },
{ value: b, fromNumericBase: 'hex' },
)
}
export function getHexGasTotal ({ gasLimit, gasPrice }) {
return ethUtil.addHexPrefix(multiplyCurrencies(gasLimit, gasPrice, {
toNumericBase: 'hex',
multiplicandBase: 16,
multiplierBase: 16,
}))
}
export function addEth (...args) {
return args.reduce((acc, base) => {
return addCurrencies(acc, base, {
toNumericBase: 'dec',
numberOfDecimals: 6,
})
})
}
export function addFiat (...args) {
return args.reduce((acc, base) => {
return addCurrencies(acc, base, {
toNumericBase: 'dec',
numberOfDecimals: 2,
})
})
}
export function getTransactionAmount ({
value,
toCurrency,
conversionRate,
numberOfDecimals,
}) {
return conversionUtil(value, {
fromNumericBase: 'hex',
toNumericBase: 'dec',
fromCurrency: 'ETH',
toCurrency,
numberOfDecimals,
fromDenomination: 'WEI',
conversionRate,
})
}
export function getTransactionFee ({
value,
toCurrency,
conversionRate,
numberOfDecimals,
}) {
return conversionUtil(value, {
fromNumericBase: 'BN',
toNumericBase: 'dec',
fromDenomination: 'WEI',
fromCurrency: 'ETH',
toCurrency,
numberOfDecimals,
conversionRate,
})
}
export function formatCurrency (value, currencyCode) {
const upperCaseCurrencyCode = currencyCode.toUpperCase()
return currencies.find(currency => currency.code === upperCaseCurrencyCode)
? currencyFormatter.format(Number(value), { code: upperCaseCurrencyCode })
: value
}
export function convertTokenToFiat ({
value,
toCurrency,
conversionRate,
contractExchangeRate,
}) {
const totalExchangeRate = conversionRate * contractExchangeRate
return conversionUtil(value, {
fromNumericBase: 'dec',
toNumericBase: 'dec',
toCurrency,
numberOfDecimals: 2,
conversionRate: totalExchangeRate,
})
}
export function hasUnconfirmedTransactions (state) {
return unconfirmedTransactionsCountSelector(state) > 0
}
export function roundExponential (value) {
const PRECISION = 4
const bigNumberValue = new BigNumber(String(value))
// In JS, numbers with exponentials greater than 20 get displayed as an exponential.
return bigNumberValue.e > 20 ? Number(bigNumberValue.toPrecision(PRECISION)) : value
}
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