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import React, { PureComponent } from 'react'
import PropTypes from 'prop-types'
import UnitInput from '../unit-input'
import CurrencyDisplay from '../currency-display'
import { getValueFromWeiHex, getWeiHexFromDecimalValue } from '../../helpers/conversions.util'
import { ETH } from '../../constants/common'
/**
* Component that allows user to enter currency values as a number, and props receive a converted
* hex value in WEI. props.value, used as a default or forced value, should be a hex value, which
* gets converted into a decimal value depending on the currency (ETH or Fiat).
*/
export default class CurrencyInput extends PureComponent {
static contextTypes = {
t: PropTypes.func,
}
static propTypes = {
conversionRate: PropTypes.number,
currentCurrency: PropTypes.string,
nativeCurrency: PropTypes.string,
onChange: PropTypes.func,
onBlur: PropTypes.func,
useFiat: PropTypes.bool,
hideFiat: PropTypes.bool,
value: PropTypes.string,
fiatSuffix: PropTypes.string,
nativeSuffix: PropTypes.string,
}
constructor (props) {
super(props)
const { value: hexValue } = props
const decimalValue = hexValue ? this.getDecimalValue(props) : 0
this.state = {
decimalValue,
hexValue,
isSwapped: false,
}
}
componentDidUpdate (prevProps) {
const { value: prevPropsHexValue } = prevProps
const { value: propsHexValue } = this.props
const { hexValue: stateHexValue } = this.state
if (prevPropsHexValue !== propsHexValue && propsHexValue !== stateHexValue) {
const decimalValue = this.getDecimalValue(this.props)
this.setState({ hexValue: propsHexValue, decimalValue })
}
}
getDecimalValue (props) {
const { value: hexValue, currentCurrency, conversionRate } = props
const decimalValueString = this.shouldUseFiat()
? getValueFromWeiHex({
value: hexValue, toCurrency: currentCurrency, conversionRate, numberOfDecimals: 2,
})
: getValueFromWeiHex({
value: hexValue, toCurrency: ETH, numberOfDecimals: 6,
})
return Number(decimalValueString) || 0
}
shouldUseFiat = () => {
const { useFiat, hideFiat } = this.props
const { isSwapped } = this.state || {}
if (hideFiat) {
return false
}
return isSwapped ? !useFiat : useFiat
}
swap = () => {
const { isSwapped, decimalValue } = this.state
this.setState({isSwapped: !isSwapped}, () => {
this.handleChange(decimalValue)
})
}
handleChange = decimalValue => {
const { currentCurrency: fromCurrency, conversionRate, onChange } = this.props
const hexValue = this.shouldUseFiat()
? getWeiHexFromDecimalValue({
value: decimalValue, fromCurrency, conversionRate, invertConversionRate: true,
})
: getWeiHexFromDecimalValue({
value: decimalValue, fromCurrency: ETH, fromDenomination: ETH, conversionRate,
})
this.setState({ hexValue, decimalValue })
onChange(hexValue)
}
handleBlur = () => {
this.props.onBlur(this.state.hexValue)
}
renderConversionComponent () {
const { currentCurrency, nativeCurrency, hideFiat } = this.props
const { hexValue } = this.state
let currency, numberOfDecimals
if (hideFiat) {
return (
<div className="currency-input__conversion-component">
{ this.context.t('noConversionRateAvailable') }
</div>
)
}
if (this.shouldUseFiat()) {
// Display ETH
currency = nativeCurrency || ETH
numberOfDecimals = 6
} else {
// Display Fiat
currency = currentCurrency
numberOfDecimals = 2
}
return (
<CurrencyDisplay
className="currency-input__conversion-component"
currency={currency}
value={hexValue}
numberOfDecimals={numberOfDecimals}
/>
)
}
render () {
const { fiatSuffix, nativeSuffix, ...restProps } = this.props
const { decimalValue } = this.state
return (
<UnitInput
{...restProps}
suffix={this.shouldUseFiat() ? fiatSuffix : nativeSuffix}
onChange={this.handleChange}
onBlur={this.handleBlur}
value={decimalValue}
actionComponent={(
<div
className="currency-input__swap-component"
onClick={this.swap}
/>
)}
>
{ this.renderConversionComponent() }
</UnitInput>
)
}
}
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