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const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
const Identicon = require('../identicon')
const { conversionUtil } = require('../../conversion-util')
module.exports = CurrencyDisplay
inherits(CurrencyDisplay, Component)
function CurrencyDisplay () {
Component.call(this)
this.state = {
value: null,
}
}
function isValidInput (text) {
const re = /^([1-9]\d*|0)(\.|\.\d*)?$/
return re.test(text)
}
function resetCaretIfPastEnd (value, event) {
const caretPosition = event.target.selectionStart
if (caretPosition > value.length) {
event.target.setSelectionRange(value.length, value.length)
}
}
function toHexWei (value) {
return conversionUtil(value, {
fromNumericBase: 'dec',
toNumericBase: 'hex',
toDenomination: 'WEI',
})
}
CurrencyDisplay.prototype.getAmount = function (value) {
const { selectedToken } = this.props
const { decimals } = selectedToken || {}
const multiplier = Math.pow(10, Number(decimals || 0))
const sendAmount = '0x' + Number(value * multiplier).toString(16)
return selectedToken
? sendAmount
: toHexWei(value)
}
CurrencyDisplay.prototype.render = function () {
const {
className = 'currency-display',
primaryBalanceClassName = 'currency-display__input',
convertedBalanceClassName = 'currency-display__converted-value',
conversionRate,
primaryCurrency,
convertedCurrency,
convertedPrefix = '',
placeholder = '0',
readOnly = false,
inError = false,
value: initValue,
handleChange,
validate,
} = this.props
const { value } = this.state
const initValueToRender = conversionUtil(initValue, {
fromNumericBase: 'hex',
toNumericBase: 'dec',
fromDenomination: 'WEI',
numberOfDecimals: 6,
conversionRate,
})
const convertedValue = conversionUtil(value || initValueToRender, {
fromNumericBase: 'dec',
fromCurrency: primaryCurrency,
toCurrency: convertedCurrency,
numberOfDecimals: 2,
conversionRate,
})
return h('div', {
className,
style: {
borderColor: inError ? 'red' : null,
},
}, [
h('div.currency-display__primary-row', [
h('div.currency-display__input-wrapper', [
h('input', {
className: primaryBalanceClassName,
value: `${value || initValueToRender} ${primaryCurrency}`,
placeholder: `${0} ${primaryCurrency}`,
readOnly,
onChange: (event) => {
let newValue = event.target.value.split(' ')[0]
if (newValue === '') {
this.setState({ value: '0' })
}
else if (newValue.match(/^0[1-9]$/)) {
this.setState({ value: newValue.match(/[1-9]/)[0] })
}
else if (newValue && !isValidInput(newValue)) {
event.preventDefault()
}
else {
this.setState({ value: newValue })
}
},
onBlur: event => !readOnly && handleChange(this.getAmount(event.target.value.split(' ')[0])),
onKeyUp: event => {
if (!readOnly) {
validate(toHexWei(value || initValueToRender))
resetCaretIfPastEnd(value || initValueToRender, event)
}
},
onClick: event => !readOnly && resetCaretIfPastEnd(value || initValueToRender, event),
}),
]),
]),
h('div', {
className: convertedBalanceClassName,
}, `${convertedValue} ${convertedCurrency.toUpperCase()}`),
])
}
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