41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
const BN = require('./bn')
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const configManager = require('./new-config-manager')
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const { utils } = require('lamassu-coins')
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function truncateCrypto (cryptoAtoms, cryptoCode) {
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const DECIMAL_PLACES = 3
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if (cryptoAtoms.eq(0)) return cryptoAtoms
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const scale = utils.getCryptoCurrency(cryptoCode).displayScale
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const scaleFactor = BN(10).pow(scale)
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return BN(cryptoAtoms).truncated().div(scaleFactor)
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.round(DECIMAL_PLACES).times(scaleFactor)
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}
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function fiatToCrypto (tx, rec, deviceId, config) {
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const usableFiat = rec.fiat - rec.cashInFee
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const commissions = configManager.getCommissions(tx.cryptoCode, deviceId, config)
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const tickerRate = BN(tx.rawTickerPrice)
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const discount = getDiscountRate(tx.discount, commissions[tx.direction])
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const rate = tickerRate.mul(discount).round(5)
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const unitScale = utils.getCryptoCurrency(tx.cryptoCode).unitScale
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const unitScaleFactor = BN(10).pow(unitScale)
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return truncateCrypto(BN(usableFiat).div(rate.div(unitScaleFactor)), tx.cryptoCode)
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}
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function getDiscountRate (discount, commission) {
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const bnDiscount = discount ? BN(discount) : BN(0)
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const bnCommission = BN(commission)
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const percentageDiscount = BN(1).sub(bnDiscount.div(100))
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const percentageCommission = bnCommission.div(100)
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return BN(1).add(percentageDiscount.mul(percentageCommission))
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}
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module.exports = {
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truncateCrypto,
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fiatToCrypto,
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getDiscountRate
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}
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