const axios = require('axios')
const _ = require('lodash/fp')

const logger = require('../../../logger')

const NAME = 'CipherTrace'
const SUPPORTED_COINS = ['BTC', 'ETH', 'BCH', 'LTC', 'BNB', 'RSK']

function getClient (account) {
  if (_.isNil(account) || !account.enabled) return null

  const [ctv1, username, secretKey] = account.authorizationValue.split(':')
  if (_.isNil(ctv1) || _.isNil(username) || _.isNil(secretKey)) {
    throw new Error('Invalid CipherTrace configuration')
  }

  const apiVersion = ctv1.slice(-2)
  const authHeader = {
    'Authorization': account.authorizationValue
  }
  return { apiVersion, authHeader }
}

function rateWallet (account, cryptoCode, address) {
  const client = getClient(account)
  if (!_.includes(_.toUpper(cryptoCode), SUPPORTED_COINS) || _.isNil(client)) return Promise.resolve(null)

  const { apiVersion, authHeader } = client
  const threshold = account.scoreThreshold

  console.log(`** DEBUG ** rateWallet ENDPOINT: https://rest.ciphertrace.com/aml/${apiVersion}/${_.toLower(cryptoCode)}/risk?address=${address}`)

  return axios.get(`https://rest.ciphertrace.com/aml/${apiVersion}/${_.toLower(cryptoCode)}/risk?address=${address}`, {
    headers: authHeader
  })
    .then(res => ({ address, score: res.data.risk, isValid: res.data.risk < threshold }))
    .then(result => {
      console.log('** DEBUG ** rateWallet RETURN:', result)
      return result
    })
    .catch(err => {
      console.log(`** DEBUG ** rateWallet ERROR: ${err.message}`)
      throw err
    })
}

function isValidWalletScore (account, score) {
  const client = getClient(account)
  if (_.isNil(client)) return Promise.resolve(true)

  const threshold = account.scoreThreshold
  return _.isNil(account) ? Promise.resolve(true) : Promise.resolve(score < threshold)
}

function getAddressTransactionsHashes (receivingAddress, cryptoCode, client, wallet) {
  const { apiVersion, authHeader } = client
  console.log(`** DEBUG ** getTransactionHash ENDPOINT: https://rest.ciphertrace.com/api/${apiVersion}/${_.toLower(cryptoCode) !== 'btc' ? `${_.toLower(cryptoCode)}_` : ``}address/search?features=tx&address=${receivingAddress}&mempool=true`)

  return axios.get(`https://rest.ciphertrace.com/api/${apiVersion}/${_.toLower(cryptoCode) !== 'btc' ? `${_.toLower(cryptoCode)}_` : ``}address/search?features=tx&address=${receivingAddress}&mempool=true`, {
    headers: authHeader
  })
    .then(_.flow(
      _.get(['data', 'txHistory']),
      _.map(_.get(['txHash']))
    ))
    .catch(err => {
      console.log(`** DEBUG ** getTransactionHash ERROR: ${err}`)
      console.log(`** DEBUG ** Fetching transactions hashes via wallet node...`)
      return wallet.getTxHashesByAddress(cryptoCode, receivingAddress)
    })
}

function getTransactionHash (account, cryptoCode, receivingAddress, wallet) {
  const client = getClient(account)
  if (!_.includes(_.toUpper(cryptoCode), SUPPORTED_COINS) || _.isNil(client)) return Promise.resolve(null)
  return getAddressTransactionsHashes(receivingAddress, cryptoCode, client, wallet)
    .then(txHashes => {
      if (_.size(txHashes) > 1) {
        logger.warn('An address generated by this wallet was used in more than one transaction')
      }
      console.log('** DEBUG ** getTransactionHash RETURN: ', _.join(', ', txHashes))
      return txHashes
    })
    .catch(err => {
      console.log('** DEBUG ** getTransactionHash from wallet node ERROR: ', err)
      throw err
    })
}

function getInputAddresses (account, cryptoCode, txHashes) {
  const client = getClient(account)
  if (_.isEmpty(txHashes) || !_.includes(_.toUpper(cryptoCode), SUPPORTED_COINS) || _.isNil(client))
    return Promise.resolve([])

  /* NOTE: The API accepts at most 10 hashes, and for us here more than 1 is already an exception, not the norm. */
  if (_.size(txHashes) > 10)
    return Promise.reject(new Error("Too many tx hashes -- shouldn't happen!"))

  const { apiVersion, authHeader } = client

  cryptoCode = _.toLower(cryptoCode)
  const lastPathComp = cryptoCode !== 'btc' ? cryptoCode + '_tx' : 'tx'

  txHashes = _(txHashes).take(10).join(',')

  const url = `https://rest.ciphertrace.com/api/${apiVersion}/${lastPathComp}?txhashes=${txHashes}`
  console.log('** DEBUG ** getInputAddresses ENDPOINT: ', url)

  return axios.get(url, { headers: authHeader })
    .then(res => {
      const data = res.data
      if (_.size(data.transactions) > 1) {
        logger.warn('An address generated by this wallet was used in more than one transaction')
      }

      const transactionInputs = _.flatMap(it => it.inputs, data.transactions)
      const inputAddresses = _.map(it => it.address, transactionInputs)

      console.log(`** DEBUG ** getInputAddresses RETURN: ${inputAddresses}`)

      return inputAddresses
    })
    .catch(err => {
      console.log(`** DEBUG ** getInputAddresses ERROR: ${err.message}`)
      throw err
    })
}

function isWalletScoringEnabled (account, cryptoCode) {
  if (!SUPPORTED_COINS.includes(cryptoCode)) {
    return Promise.reject(new Error('Unsupported crypto: ' + cryptoCode))
  }

  return Promise.resolve(!_.isNil(account) && account.enabled)
}

module.exports = {
  NAME,
  rateWallet,
  isValidWalletScore,
  getTransactionHash,
  getInputAddresses,
  isWalletScoringEnabled
}