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const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
const ethUtil = require('ethereumjs-util')
const BN = ethUtil.BN
const extend = require('xtend')
module.exports = BnAsDecimalInput
inherits(BnAsDecimalInput, Component)
function BnAsDecimalInput () {
this.state = { invalid: null }
Component.call(this)
}
/* Bn as Decimal Input
*
* A component for allowing easy, decimal editing
* of a passed in bn string value.
*
* On change, calls back its `onChange` function parameter
* and passes it an updated bn string.
*/
BnAsDecimalInput.prototype.render = function () {
const props = this.props
const state = this.state
const { value, scale, precision, onChange, min, max } = props
const suffix = props.suffix
const style = props.style
const valueString = value.toString(10)
const newValue = this.downsize(valueString, scale, precision)
return (
h('.flex-column', [
h('.flex-row', {
style: {
alignItems: 'flex-end',
lineHeight: '13px',
fontFamily: 'Montserrat Light',
textRendering: 'geometricPrecision',
},
}, [
h('input.hex-input', {
type: 'number',
step: 'any',
required: true,
min: min,
max: max,
style: extend({
display: 'block',
textAlign: 'right',
backgroundColor: 'transparent',
border: '1px solid #bdbdbd',
}, style),
value: newValue,
onBlur: (event) => {
this.updateValidity(event)
},
onChange: (event) => {
this.updateValidity(event)
const value = (event.target.value === '') ? '' : event.target.value
const scaledNumber = this.upsize(value, scale, precision)
const precisionBN = new BN(scaledNumber, 10)
onChange(precisionBN)
},
onInvalid: (event) => {
const msg = this.constructWarning()
if (msg === state.invalid) {
return
}
this.setState({ invalid: msg })
event.preventDefault()
return false
},
}),
h('div', {
style: {
color: ' #AEAEAE',
fontSize: '12px',
marginLeft: '5px',
marginRight: '6px',
width: '20px',
},
}, suffix),
]),
state.invalid ? h('span.error', {
style: {
position: 'absolute',
right: '0px',
textAlign: 'right',
transform: 'translateY(26px)',
padding: '3px',
background: 'rgba(255,255,255,0.85)',
zIndex: '1',
textTransform: 'capitalize',
border: '2px solid #E20202',
},
}, state.invalid) : null,
])
)
}
BnAsDecimalInput.prototype.setValid = function (message) {
this.setState({ invalid: null })
}
BnAsDecimalInput.prototype.updateValidity = function (event) {
const target = event.target
const value = this.props.value
const newValue = target.value
if (value === newValue) {
return
}
const valid = target.checkValidity()
if (valid) {
this.setState({ invalid: null })
}
}
BnAsDecimalInput.prototype.constructWarning = function () {
const { name, min, max } = this.props
let message = name ? name + ' ' : ''
if (min && max) {
message += `must be greater than or equal to ${min} and less than or equal to ${max}.`
} else if (min) {
message += `must be greater than or equal to ${min}.`
} else if (max) {
message += `must be less than or equal to ${max}.`
} else {
message += 'Invalid input.'
}
return message
}
BnAsDecimalInput.prototype.downsize = function (number, scale, precision) {
// if there is no scaling, simply return the number
if (scale === 0) {
return Number(number)
} else {
// if the scale is the same as the precision, account for this edge case.
var decimals = (scale === precision) ? -1 : scale - precision
return Number(number.slice(0, -scale) + '.' + number.slice(-scale, decimals))
}
}
BnAsDecimalInput.prototype.upsize = function (number, scale, precision) {
var stringArray = number.toString().split('.')
var decimalLength = stringArray[1] ? stringArray[1].length : 0
var newString = stringArray[0]
// If there is scaling and decimal parts exist, integrate them in.
if ((scale !== 0) && (decimalLength !== 0)) {
newString += stringArray[1].slice(0, precision)
}
// Add 0s to account for the upscaling.
for (var i = decimalLength; i < scale; i++) {
newString += '0'
}
return newString
}
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