const fs = require('fs')
const path = require('path')
const _ = require('lodash/fp')
const { COINS, utils } = require('@lamassu/coins')
const { default: PQueue } = require('p-queue')

const BN = require('../../../bn')
const E = require('../../../error')
const logger = require('../../../logger')
const jsonRpc = require('../../common/json-rpc')

const BLOCKCHAIN_DIR = process.env.BLOCKCHAIN_DIR

const cryptoRec = utils.getCryptoCurrency(COINS.XMR)
const configPath = utils.configPath(cryptoRec, BLOCKCHAIN_DIR)
const walletDir = path.resolve(
  utils.cryptoDir(cryptoRec, BLOCKCHAIN_DIR),
  'wallets',
)

const DIGEST_QUEUE = new PQueue({
  concurrency: 1,
  interval: 150,
})

function createDigestRequest(account = {}, method, params = []) {
  return DIGEST_QUEUE.add(() =>
    jsonRpc.fetchDigest(account, method, params).then(res => {
      const r = JSON.parse(res)
      if (r.error) throw r.error
      return r.result
    }),
  )
}

function rpcConfig() {
  try {
    const config = jsonRpc.parseConf(configPath)
    return {
      username: config['rpc-login'].split(':')[0],
      password: config['rpc-login'].split(':')[1],
      port: cryptoRec.walletPort || cryptoRec.defaultPort,
    }
  } catch (err) {
    logger.error(`Wallet is currently not installed! ${err}`)
    return {
      username: '',
      password: '',
      port: cryptoRec.walletPort || cryptoRec.defaultPort,
    }
  }
}

function fetch(method, params) {
  return createDigestRequest(rpcConfig(), method, params)
}

function handleError(error, method) {
  switch (error.code) {
    case -13: {
      if (
        fs.existsSync(path.resolve(walletDir, 'Wallet')) &&
        fs.existsSync(path.resolve(walletDir, 'Wallet.keys'))
      ) {
        logger.debug('Found wallet! Opening wallet...')
        return openWallet()
      }
      logger.debug("Couldn't find wallet! Creating...")
      return createWallet()
    }
    case -21:
      throw new Error('Wallet already exists!')
    case -22:
      try {
        return openWalletWithPassword()
      } catch {
        throw new Error('Invalid wallet password!')
      }
    case -17:
      throw new E.InsufficientFundsError()
    case -37:
      throw new E.InsufficientFundsError()
    default:
      throw new Error(
        _.join(' ', [
          `json-rpc::${method} error:`,
          JSON.stringify(_.get('message', error, '')),
          JSON.stringify(_.get('response.data.error', error, '')),
        ]),
      )
  }
}

function openWallet() {
  return fetch('open_wallet', { filename: 'Wallet' }).catch(() =>
    openWalletWithPassword(),
  )
}

function openWalletWithPassword() {
  return fetch('open_wallet', {
    filename: 'Wallet',
    password: rpcConfig().password,
  })
}

function createWallet() {
  return fetch('create_wallet', { filename: 'Wallet', language: 'English' })
    .then(() => new Promise(() => setTimeout(() => openWallet(), 3000)))
    .then(() => fetch('auto_refresh'))
}

function checkCryptoCode(cryptoCode) {
  if (cryptoCode !== 'XMR')
    return Promise.reject(new Error('Unsupported crypto: ' + cryptoCode))
  return Promise.resolve()
}

function refreshWallet() {
  return fetch('refresh').catch(err => handleError(err, 'refreshWallet'))
}

function accountBalance(cryptoCode) {
  return checkCryptoCode(cryptoCode)
    .then(() => refreshWallet())
    .then(() =>
      fetch('get_balance', { account_index: 0, address_indices: [0] }),
    )
    .then(res => {
      return BN(res.unlocked_balance).decimalPlaces(0)
    })
    .catch(err => handleError(err, 'accountBalance'))
}

function balance(account, cryptoCode) {
  return accountBalance(cryptoCode)
}

function sendCoins(account, tx) {
  const { toAddress, cryptoAtoms, cryptoCode } = tx
  return checkCryptoCode(cryptoCode)
    .then(() => refreshWallet())
    .then(() =>
      fetch('transfer_split', {
        destinations: [{ amount: cryptoAtoms, address: toAddress }],
        account_index: 0,
        subaddr_indices: [],
        priority: 0,
        mixin: 6,
        ring_size: 7,
        unlock_time: 0,
        get_tx_hex: false,
        new_algorithm: false,
        get_tx_metadata: false,
      }),
    )
    .then(res => ({
      fee: BN(res.fee_list[0]).abs(),
      txid: res.tx_hash_list[0],
    }))
    .catch(err => handleError(err, 'sendCoins'))
}

function newAddress(account, info) {
  return checkCryptoCode(info.cryptoCode)
    .then(() => fetch('create_address', { account_index: 0 }))
    .then(res => res.address)
    .catch(err => handleError(err, 'newAddress'))
}

function getStatus(account, tx, requested) {
  const { toAddress, cryptoCode } = tx
  return checkCryptoCode(cryptoCode)
    .then(() => refreshWallet())
    .then(() => fetch('get_address_index', { address: toAddress }))
    .then(addressRes =>
      fetch('get_transfers', {
        in: true,
        pool: true,
        account_index: addressRes.index.major,
        subaddr_indices: [addressRes.index.minor],
      }),
    )
    .then(transferRes => {
      const confirmedToAddress = _.filter(
        it => it.address === toAddress,
        transferRes.in ?? [],
      )
      const pendingToAddress = _.filter(
        it => it.address === toAddress,
        transferRes.pool ?? [],
      )
      const confirmed = _.reduce(
        (acc, value) => acc.plus(value.amount),
        BN(0),
        confirmedToAddress,
      )
      const pending = _.reduce(
        (acc, value) => acc.plus(value.amount),
        BN(0),
        pendingToAddress,
      )

      if (confirmed.gte(requested))
        return { receivedCryptoAtoms: confirmed, status: 'confirmed' }
      if (pending.gte(requested))
        return { receivedCryptoAtoms: pending, status: 'authorized' }
      if (pending.gt(0))
        return { receivedCryptoAtoms: pending, status: 'insufficientFunds' }
      return { receivedCryptoAtoms: pending, status: 'notSeen' }
    })
    .catch(err => handleError(err, 'getStatus'))
}

function newFunding(account, cryptoCode) {
  return checkCryptoCode(cryptoCode)
    .then(() => refreshWallet())
    .then(() =>
      Promise.all([
        fetch('get_balance', { account_index: 0, address_indices: [0] }),
        fetch('create_address', { account_index: 0 }),
        fetch('get_transfers', { pool: true, account_index: 0 }),
      ]),
    )
    .then(([balanceRes, addressRes, transferRes]) => {
      const memPoolBalance = _.reduce(
        (acc, value) => acc.plus(value.amount),
        BN(0),
        transferRes.pool,
      )
      return {
        fundingPendingBalance: BN(balanceRes.balance)
          .minus(balanceRes.unlocked_balance)
          .plus(memPoolBalance),
        fundingConfirmedBalance: BN(balanceRes.unlocked_balance),
        fundingAddress: addressRes.address,
      }
    })
    .catch(err => handleError(err, 'newFunding'))
}

function cryptoNetwork(account, cryptoCode) {
  return checkCryptoCode(cryptoCode).then(() => {
    switch (parseInt(rpcConfig().port, 10)) {
      case 18082:
        return 'main'
      case 28082:
        return 'test'
      case 38083:
        return 'stage'
      default:
        return ''
    }
  })
}

function checkBlockchainStatus(cryptoCode) {
  return checkCryptoCode(cryptoCode).then(() => {
    try {
      const config = jsonRpc.parseConf(configPath)

      // Daemon uses a different connection of the wallet
      const rpcConfig = {
        username: config['rpc-login'].split(':')[0],
        password: config['rpc-login'].split(':')[1],
        port: cryptoRec.defaultPort,
      }

      return jsonRpc
        .fetchDigest(rpcConfig, 'get_info')
        .then(res => (res.synchronized ? 'ready' : 'syncing'))
    } catch (err) {
      throw new Error(`XMR daemon is currently not installed. ${err}`)
    }
  })
}

function getTxHashesByAddress(cryptoCode, address) {
  checkCryptoCode(cryptoCode)
    .then(() => refreshWallet())
    .then(() => fetch('get_address_index', { address: address }))
    .then(addressRes =>
      fetch('get_transfers', {
        in: true,
        pool: true,
        pending: true,
        account_index: addressRes.index.major,
        subaddr_indices: [addressRes.index.minor],
      }),
    )
    .then(_.map(({ txid }) => txid))
}

module.exports = {
  balance,
  sendCoins,
  newAddress,
  getStatus,
  newFunding,
  cryptoNetwork,
  checkBlockchainStatus,
  getTxHashesByAddress,
}