const _ = require('lodash/fp')
const devMode = require('minimist')(process.argv.slice(2)).dev

const currencies = require('../../currencies.json')
const languageRec = require('../../languages.json')
const countries = require('../../countries.json')
const settingsLoader = require('../settings-loader')

const db = require('../db')
const configManager = require('../config-manager')
const configValidate = require('../config-validate')
const machineLoader = require('../machine-loader')
const jsonSchema = require('../../lamassu-schema.json')

function fetchSchema () {
  return _.cloneDeep(jsonSchema)
}

function fetchConfig () {
  const sql = `select data from user_config where type=$1 and schema_version=$2
  order by id desc limit 1`

  return db.oneOrNone(sql, ['config', configValidate.SETTINGS_LOADER_SCHEMA_VERSION])
    .then(row => row ? row.data.config : [])
}

function allScopes (cryptoScopes, machineScopes) {
  const scopes = []
  cryptoScopes.forEach(c => {
    machineScopes.forEach(m => scopes.push([c, m]))
  })

  return scopes
}

function allMachineScopes (machineList, machineScope) {
  const machineScopes = []

  if (machineScope === 'global' || machineScope === 'both') machineScopes.push('global')
  if (machineScope === 'specific' || machineScope === 'both') machineList.forEach(r => machineScopes.push(r))

  return machineScopes
}

function getCryptos (config, machineList) {
  const scopes = allScopes(['global'], allMachineScopes(machineList, 'both'))
  const scoped = scope => configManager.scopedValue(scope[0], scope[1], 'cryptoCurrencies', config)
  return scopes.reduce((acc, scope) => _.union(acc, scoped(scope)), [])
}

function getGroup (schema, fieldCode) {
  return schema.groups.find(group => group.fields.find(_.isEqual(fieldCode)))
}

function getField (schema, group, fieldCode) {
  if (!group) group = getGroup(schema, fieldCode)
  const field = schema.fields.find(r => r.code === fieldCode)
  return _.merge(_.pick(['cryptoScope', 'machineScope'], group), field)
}

const fetchMachines = () => machineLoader.getMachines()
  .then(machineList => machineList.map(r => r.deviceId))

function validateCurrentConfig () {
  return fetchConfig()
    .then(configValidate.validateRequires)
}

const decorateEnabledIf = _.curry((schemaFields, schemaField) => {
  const code = schemaField.fieldLocator.code
  const field = _.find(f => f.code === code, schemaFields)

  return _.assign(schemaField, {
    fieldEnabledIfAny: field.enabledIfAny || [],
    fieldEnabledIfAll: field.enabledIfAll || []
  })
})

function fetchConfigGroup (code) {
  const fieldLocatorCodeEq = _.matchesProperty(['fieldLocator', 'code'])
  return Promise.all([fetchSchema(), fetchData(), fetchConfig(), fetchMachines()])
    .then(([schema, data, config, machineList]) => {
      const groupSchema = schema.groups.find(r => r.code === code)

      if (!groupSchema) throw new Error('No such group schema: ' + code)

      const schemaFields = groupSchema.fields
        .map(_.curry(getField)(schema, groupSchema))
        .map(f => _.assign(f, {
          fieldEnabledIfAny: f.enabledIfAny || [],
          fieldEnabledIfAll: f.enabledIfAll || []
        }))

      const candidateFields = [
        schemaFields.map(_.get('requiredIf')),
        schemaFields.map(_.get('enabledIfAny')),
        schemaFields.map(_.get('enabledIfAll')),
        groupSchema.fields,
        'fiatCurrency'
      ]

      const smush = _.flow(_.flattenDeep, _.compact, _.uniq)
      const configFields = smush(candidateFields)

      // Expand this to check against full schema
      const fieldValidator = field => !_.isNil(_.get('fieldLocator.fieldScope.crypto', field))

      const reducer = (acc, configField) => {
        return acc.concat(config.filter(fieldLocatorCodeEq(configField)))
      }

      const reducedFields = _.filter(fieldValidator, configFields.reduce(reducer, []))
      const values = _.map(decorateEnabledIf(schema.fields), reducedFields)

      groupSchema.fields = undefined
      groupSchema.entries = schemaFields

      const selectedCryptos = _.defaultTo([], getCryptos(config, machineList))

      return {
        schema: groupSchema,
        values,
        selectedCryptos,
        data
      }
    })
}

function massageCurrencies (currencies) {
  const convert = r => ({
    code: r['Alphabetic Code'],
    display: r['Currency']
  })
  const top5Codes = ['USD', 'EUR', 'GBP', 'CAD', 'AUD']
  const mapped = _.map(convert, currencies)
  const codeToRec = code => _.find(_.matchesProperty('code', code), mapped)
  const top5 = _.map(codeToRec, top5Codes)
  const raw = _.uniqBy(_.get('code'), _.concat(top5, mapped))
  return raw.filter(r => r.code[0] !== 'X' && r.display.indexOf('(') === -1)
}

const mapLanguage = lang => {
  const arr = lang.split('-')
  const code = arr[0]
  const country = arr[1]
  const langNameArr = languageRec.lang[code]
  if (!langNameArr) return null
  const langName = langNameArr[0]
  if (!country) return {code: lang, display: langName}
  return {code: lang, display: `${langName} [${country}]`}
}

const supportedLanguages = languageRec.supported
const languages = supportedLanguages.map(mapLanguage).filter(r => r)
const ALL_CRYPTOS = ['BTC', 'ETH', 'LTC', 'DASH', 'ZEC', 'BCH']

const filterAccounts = (data, isDevMode) => {
  const notAllowed = ['mock-ticker', 'mock-wallet', 'mock-exchange', 'mock-sms', 'mock-id-verify', 'mock-zero-conf']
  const filterOut = o => _.includes(o.code, notAllowed)
  return isDevMode ? data : {...data, accounts: _.filter(a => !filterOut(a), data.accounts)}
}

function fetchData () {
  return machineLoader.getMachineNames()
    .then(machineList => ({
      currencies: massageCurrencies(currencies),
      cryptoCurrencies: [
        {crypto: 'BTC', display: 'Bitcoin'},
        {crypto: 'ETH', display: 'Ethereum'},
        {crypto: 'LTC', display: 'Litecoin'},
        {crypto: 'DASH', display: 'Dash'},
        {crypto: 'ZEC', display: 'Zcash'},
        {crypto: 'BCH', display: 'Bitcoin Cash'}
      ],
      languages: languages,
      countries,
      accounts: [
        {code: 'bitpay', display: 'Bitpay', class: 'ticker', cryptos: ['BTC', 'BCH']},
        {code: 'kraken', display: 'Kraken', class: 'ticker', cryptos: ['BTC', 'ETH', 'LTC', 'DASH', 'ZEC', 'BCH']},
        {code: 'bitstamp', display: 'Bitstamp', class: 'ticker', cryptos: ['BTC', 'ETH', 'LTC', 'BCH']},
        {code: 'coinbase', display: 'Coinbase', class: 'ticker', cryptos: ['BTC', 'ETH', 'LTC', 'BCH', 'ZEC', 'DASH']},
        {code: 'itbit', display: 'itBit', class: 'ticker', cryptos: ['BTC', 'ETH']},
        {code: 'mock-ticker', display: 'Mock (Caution!)', class: 'ticker', cryptos: ALL_CRYPTOS},
        {code: 'bitcoind', display: 'bitcoind', class: 'wallet', cryptos: ['BTC']},
        {code: 'no-layer2', display: 'No Layer 2', class: 'layer2', cryptos: ALL_CRYPTOS},
        {code: 'infura', display: 'Infura', class: 'wallet', cryptos: ['ETH']},
        {code: 'geth', display: 'geth', class: 'wallet', cryptos: ['ETH']},
        {code: 'zcashd', display: 'zcashd', class: 'wallet', cryptos: ['ZEC']},
        {code: 'litecoind', display: 'litecoind', class: 'wallet', cryptos: ['LTC']},
        {code: 'dashd', display: 'dashd', class: 'wallet', cryptos: ['DASH']},
        {code: 'bitcoincashd', display: 'bitcoincashd', class: 'wallet', cryptos: ['BCH']},
        {code: 'bitgo', display: 'BitGo', class: 'wallet', cryptos: ['BTC', 'ZEC', 'LTC', 'BCH', 'DASH']},
        {code: 'bitstamp', display: 'Bitstamp', class: 'exchange', cryptos: ['BTC', 'ETH', 'LTC', 'BCH']},
        {code: 'itbit', display: 'itBit', class: 'exchange', cryptos: ['BTC', 'ETH']},
        {code: 'kraken', display: 'Kraken', class: 'exchange', cryptos: ['BTC', 'ETH', 'LTC', 'DASH', 'ZEC', 'BCH']},
        {code: 'mock-wallet', display: 'Mock (Caution!)', class: 'wallet', cryptos: ALL_CRYPTOS},
        {code: 'no-exchange', display: 'No exchange', class: 'exchange', cryptos: ALL_CRYPTOS},
        {code: 'mock-exchange', display: 'Mock exchange', class: 'exchange', cryptos: ALL_CRYPTOS},
        {code: 'mock-sms', display: 'Mock SMS', class: 'sms'},
        {code: 'mock-id-verify', display: 'Mock ID verifier', class: 'idVerifier'},
        {code: 'twilio', display: 'Twilio', class: 'sms'},
        {code: 'mailgun', display: 'Mailgun', class: 'email'},
        {code: 'all-zero-conf', display: 'Always 0-conf', class: 'zeroConf', cryptos: ['BTC', 'ZEC', 'LTC', 'DASH', 'BCH']},
        {code: 'no-zero-conf', display: 'Always 1-conf', class: 'zeroConf', cryptos: ALL_CRYPTOS},
        {code: 'blockcypher', display: 'Blockcypher', class: 'zeroConf', cryptos: ['BTC']},
        {code: 'mock-zero-conf', display: 'Mock 0-conf', class: 'zeroConf', cryptos: ['BTC', 'ZEC', 'LTC', 'DASH', 'BCH', 'ETH']}
      ],
      machines: machineList.map(machine => ({machine: machine.deviceId, display: machine.name}))
    }))
    .then((data) => {
      return filterAccounts(data, devMode)
    })
}

function saveConfigGroup (results) {
  if (results.values.length === 0) return fetchConfigGroup(results.groupCode)

  return settingsLoader.modifyConfig(results.values)
    .then(() => fetchConfigGroup(results.groupCode))
}

module.exports = {
  fetchConfigGroup,
  saveConfigGroup,
  validateCurrentConfig,
  fetchConfig,
  filterAccounts
}