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const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
const { conversionUtil, multiplyCurrencies } = require('../../conversion-util')
const currencyFormatter = require('currency-formatter')
const currencies = require('currency-formatter/currencies')
const ethUtil = require('ethereumjs-util')
module.exports = CurrencyDisplay
inherits(CurrencyDisplay, Component)
function CurrencyDisplay () {
Component.call(this)
}
function toHexWei (value) {
return conversionUtil(value, {
fromNumericBase: 'dec',
toNumericBase: 'hex',
toDenomination: 'WEI',
})
}
CurrencyDisplay.prototype.componentWillMount = function () {
this.setState({
valueToRender: this.getValueToRender(this.props),
})
}
CurrencyDisplay.prototype.componentWillReceiveProps = function (nextProps) {
const currentValueToRender = this.getValueToRender(this.props)
const newValueToRender = this.getValueToRender(nextProps)
if (currentValueToRender !== newValueToRender) {
this.setState({
valueToRender: newValueToRender,
})
}
}
CurrencyDisplay.prototype.getAmount = function (value) {
const { selectedToken } = this.props
const { decimals } = selectedToken || {}
const multiplier = Math.pow(10, Number(decimals || 0))
const sendAmount = multiplyCurrencies(value || '0', multiplier, {toNumericBase: 'hex'})
return selectedToken
? sendAmount
: toHexWei(value)
}
CurrencyDisplay.prototype.getValueToRender = function ({ selectedToken, conversionRate, value, readOnly }) {
if (value === '0x0') return readOnly ? '0' : ''
const { decimals, symbol } = selectedToken || {}
const multiplier = Math.pow(10, Number(decimals || 0))
return selectedToken
? conversionUtil(ethUtil.addHexPrefix(value), {
fromNumericBase: 'hex',
toCurrency: symbol,
conversionRate: multiplier,
invertConversionRate: true,
})
: conversionUtil(ethUtil.addHexPrefix(value), {
fromNumericBase: 'hex',
toNumericBase: 'dec',
fromDenomination: 'WEI',
numberOfDecimals: 9,
conversionRate,
})
}
CurrencyDisplay.prototype.getConvertedValueToRender = function (nonFormattedValue) {
const { primaryCurrency, convertedCurrency, conversionRate } = this.props
let convertedValue = conversionUtil(nonFormattedValue, {
fromNumericBase: 'dec',
fromCurrency: primaryCurrency,
toCurrency: convertedCurrency,
numberOfDecimals: 2,
conversionRate,
})
convertedValue = Number(convertedValue).toFixed(2)
const upperCaseCurrencyCode = convertedCurrency.toUpperCase()
return currencies.find(currency => currency.code === upperCaseCurrencyCode)
? currencyFormatter.format(Number(convertedValue), {
code: upperCaseCurrencyCode,
})
: convertedValue
}
CurrencyDisplay.prototype.handleChange = function (newVal) {
this.setState({ valueToRender: newVal })
this.props.onChange(this.getAmount(newVal))
}
CurrencyDisplay.prototype.getInputWidth = function (valueToRender, readOnly) {
const valueString = String(valueToRender)
const valueLength = valueString.length || 1
const decimalPointDeficit = valueString.match(/\./) ? -0.5 : 0
return (valueLength + decimalPointDeficit + 0.75) + 'ch'
}
CurrencyDisplay.prototype.render = function () {
const {
className = 'currency-display',
primaryBalanceClassName = 'currency-display__input',
convertedBalanceClassName = 'currency-display__converted-value',
primaryCurrency,
convertedCurrency,
readOnly = false,
inError = false,
onBlur,
} = this.props
const { valueToRender } = this.state
const convertedValueToRender = this.getConvertedValueToRender(valueToRender)
return h('div', {
className,
style: {
borderColor: inError ? 'red' : null,
},
onClick: () => {
this.currencyInput && this.currencyInput.focus()
},
}, [
h('div.currency-display__primary-row', [
h('div.currency-display__input-wrapper', [
h('input', {
className: primaryBalanceClassName,
value: `${valueToRender}`,
placeholder: '0',
type: 'number',
readOnly,
...(!readOnly ? {
onChange: e => this.handleChange(e.target.value),
onBlur: () => onBlur(this.getAmount(valueToRender)),
} : {}),
ref: input => { this.currencyInput = input },
style: {
width: this.getInputWidth(valueToRender, readOnly),
},
min: 0,
}),
h('span.currency-display__currency-symbol', primaryCurrency),
]),
]),
h('div', {
className: convertedBalanceClassName,
}, `${convertedValueToRender} ${convertedCurrency.toUpperCase()}`),
])
}
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