const _ = require('lodash/fp')
const BN = require('../../bn')
const settingsLoader = require('../../new-settings-loader')
const configManager = require('../../new-config-manager')
const wallet = require('../../wallet')
const ticker = require('../../ticker')
const txBatching = require('../../tx-batching')
const { utils: coinUtils } = require('@lamassu/coins')

function computeCrypto (cryptoCode, _balance) {
  const cryptoRec = coinUtils.getCryptoCurrency(cryptoCode)
  const unitScale = cryptoRec.unitScale

  return new BN(_balance).shiftedBy(-unitScale).decimalPlaces(5)
}

function computeFiat (rate, cryptoCode, _balance) {
  const cryptoRec = coinUtils.getCryptoCurrency(cryptoCode)
  const unitScale = cryptoRec.unitScale

  return new BN(_balance).shiftedBy(-unitScale).times(rate).decimalPlaces(5)
}

function getSingleCoinFunding (settings, fiatCode, cryptoCode) {
  const promises = [
    wallet.newFunding(settings, cryptoCode),
    ticker.getRates(settings, fiatCode, cryptoCode),
    txBatching.getOpenBatchCryptoValue(cryptoCode)
  ]

  return Promise.all(promises)
    .then(([fundingRec, ratesRec, batchRec]) => {
      const rates = ratesRec.rates
      const rate = (rates.ask.plus(rates.bid)).div(2)
      const fundingConfirmedBalance = fundingRec.fundingConfirmedBalance
      const fiatConfirmedBalance = computeFiat(rate, cryptoCode, fundingConfirmedBalance)
      const pending = fundingRec.fundingPendingBalance.minus(batchRec)
      const fiatPending = computeFiat(rate, cryptoCode, pending)
      const fundingAddress = fundingRec.fundingAddress
      const fundingAddressUrl = coinUtils.buildUrl(cryptoCode, fundingAddress)

      return {
        cryptoCode,
        fundingAddress,
        fundingAddressUrl,
        confirmedBalance: computeCrypto(cryptoCode, fundingConfirmedBalance).toFormat(5),
        pending: computeCrypto(cryptoCode, pending).toFormat(5),
        fiatConfirmedBalance: fiatConfirmedBalance,
        fiatPending: fiatPending,
        fiatCode
      }
    })
}

// Promise.allSettled not running on current version of node
const reflect = p => p.then(value => ({ value, status: 'fulfilled' }), error => ({ error: error.toString(), status: 'rejected' }))

function getFunding () {
  return settingsLoader.loadLatest().then(settings => {
    const cryptoCodes = configManager.getAllCryptoCurrencies(settings.config)
    const fiatCode = configManager.getGlobalLocale(settings.config).fiatCurrency
    const pareCoins = c => _.includes(c.cryptoCode, cryptoCodes)
    const cryptoCurrencies = coinUtils.cryptoCurrencies()
    const cryptoDisplays = _.filter(pareCoins, cryptoCurrencies)

    const promises = cryptoDisplays.map(it => getSingleCoinFunding(settings, fiatCode, it.cryptoCode))
    return Promise.all(promises.map(reflect))
      .then((response) => {
        const mapped = response.map(it => _.merge({ errorMsg: it.error }, it.value))
        return _.toArray(_.merge(mapped, cryptoDisplays))
      })
  })
}

module.exports = { getFunding }