const _ = require('lodash/fp')

const kraken = require('../exchange/kraken')
const bitstamp = require('../exchange/bitstamp')
const itbit = require('../exchange/itbit')
const binanceus = require('../exchange/binanceus')
const cex = require('../exchange/cex')
const bitpay = require('../ticker/bitpay')
const binance = require('../exchange/binance')
const bitfinex = require('../exchange/bitfinex')

const ALL = {
  cex: cex,
  binanceus: binanceus,
  kraken: kraken,
  bitstamp: bitstamp,
  itbit: itbit,
  bitpay: bitpay,
  binance: binance,
  bitfinex: bitfinex,
}

function buildMarket(fiatCode, cryptoCode, serviceName) {
  if (!_.includes(cryptoCode, ALL[serviceName].CRYPTO)) {
    throw new Error('Unsupported crypto: ' + cryptoCode)
  }

  if (_.isNil(fiatCode))
    throw new Error('Market pair building failed: Missing fiat code')
  return cryptoCode + '/' + fiatCode
}

function verifyFiatSupport(fiatCode, serviceName) {
  const fiat = ALL[serviceName].FIAT
  return fiat === 'ALL_CURRENCIES' ? true : _.includes(fiatCode, fiat)
}

function isConfigValid(config, fields) {
  const values = _.map(it => _.get(it)(config))(fields)
  return _.every(it => it || it === 0)(values)
}

function defaultFiatMarket(serviceName) {
  return ALL[serviceName].DEFAULT_FIAT_MARKET
}

module.exports = {
  buildMarket,
  ALL,
  verifyFiatSupport,
  isConfigValid,
  defaultFiatMarket,
}