#!/usr/bin/env node

require('dotenv').config();
const fs = require('fs');
const axios = require('axios');
const assert = require('assert');
const snarkjs = require('snarkjs');
const crypto = require('crypto');
const circomlib = require('circomlib');
const bigInt = snarkjs.bigInt;
const merkleTree = require('fixed-merkle-tree');
const Web3 = require('web3');
const Web3HttpProvider = require('web3-providers-http');
const buildGroth16 = require('websnark/src/groth16');
const websnarkUtils = require('websnark/src/utils');
const { toWei, fromWei, toBN, BN } = require('web3-utils');
const BigNumber = require('bignumber.js');
const config = require('./config');
const program = require('commander');
const { GasPriceOracle } = require('gas-price-oracle');
const { SocksProxyAgent } = require('socks-proxy-agent');
const is_ip_private = require('private-ip');
const readline = require('readline');

const prompt = readline.createInterface({ input: process.stdin, output: process.stdout });
const gasSpeedPreferences = ['instant', 'fast', 'standard', 'low'];

let web3,
  torPort,
  tornado,
  tornadoContract,
  tornadoInstance,
  circuit,
  proving_key,
  groth16,
  erc20,
  senderAccount,
  netId,
  netName,
  netSymbol,
  multiCall,
  subgraph;
let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, PRIVATE_KEY;

/** Command state parameters */
let preferenceSpeed = gasSpeedPreferences[0];
let isTestRPC,
  eipGasSupport = false;
let shouldPromptConfirmation = true;
let doNotSubmitTx, privateRpc;
/** ----------------------------------------- **/

/** Generate random number of specified byte length */
const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes));

/** Compute pedersen hash */
const pedersenHash = (data) => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0];

/** BigNumber to hex string of specified length */
function toHex(number, length = 32) {
  const str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16);
  return '0x' + str.padStart(length * 2, '0');
}

/** Remove Decimal without rounding with BigNumber */
function rmDecimalBN(bigNum, decimals = 6) {
  return new BigNumber(bigNum)
    .times(BigNumber(10).pow(decimals))
    .integerValue(BigNumber.ROUND_DOWN)
    .div(BigNumber(10).pow(decimals))
    .toNumber();
}

/** Use MultiCall Contract */
async function useMultiCall(queryArray) {
  const multiCallABI = require('./build/contracts/Multicall.abi.json');
  const multiCallContract = new web3.eth.Contract(multiCallABI, multiCall);
  const { returnData } = await multiCallContract.methods.aggregate(queryArray).call();
  return returnData;
}

/** Display ETH account balance */
async function printETHBalance({ address, name }) {
  const checkBalance = new BigNumber(await web3.eth.getBalance(address)).div(BigNumber(10).pow(18));
  console.log(`${name} balance is`, rmDecimalBN(checkBalance), `${netSymbol}`);
}

/** Display ERC20 account balance */
async function printERC20Balance({ address, name, tokenAddress }) {
  let tokenDecimals, tokenBalance, tokenName, tokenSymbol;
  const erc20ContractJson = require('./build/contracts/ERC20Mock.json');
  erc20 = tokenAddress ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : erc20;
  if (!isTestRPC && !multiCall) {
    const tokenCall = await useMultiCall([
      [tokenAddress, erc20.methods.balanceOf(address).encodeABI()],
      [tokenAddress, erc20.methods.decimals().encodeABI()],
      [tokenAddress, erc20.methods.name().encodeABI()],
      [tokenAddress, erc20.methods.symbol().encodeABI()]
    ]);
    tokenDecimals = parseInt(tokenCall[1]);
    tokenBalance = new BigNumber(tokenCall[0]).div(BigNumber(10).pow(tokenDecimals));
    tokenName = web3.eth.abi.decodeParameter('string', tokenCall[2]);
    tokenSymbol = web3.eth.abi.decodeParameter('string', tokenCall[3]);
  } else {
    tokenDecimals = await erc20.methods.decimals().call();
    tokenBalance = new BigNumber(await erc20.methods.balanceOf(address).call()).div(BigNumber(10).pow(tokenDecimals));
    tokenName = await erc20.methods.name().call();
    tokenSymbol = await erc20.methods.symbol().call();
  }
  console.log(`${name}`, tokenName, `Balance is`, rmDecimalBN(tokenBalance), tokenSymbol);
}

/**
 * Compute merkle tree and its root from array of cached deposit events
 * @param {Array} depositEvents Array of deposit event objects
 * @returns {Object} treeData
 * @returns {String[]} treeData.leaves Commitment hashes converted to decimals
 * @returns {@link MerkleTree} treeData.tree Builded merkle tree
 * @returns {String} treeData.root Merkle tree root
 */
function computeDepositEventsTree(depositEvents) {
  const leaves = depositEvents
    .sort((a, b) => a.leafIndex - b.leafIndex) // Sort events in chronological order
    .map((e) => toBN(e.commitment).toString(10)); // Leaf = commitment pedersen hash of deposit

  console.log('Computing deposit events merkle tree and its root');
  const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves);

  return { leaves, tree, root: tree.root() };
}

/**
 * Check validity of events merkle tree root via tornado contract
 * @async
 * @param {Array} depositEvents
 * @returns {boolean} True, if root is valid, else false
 * @throws {Error}
 */
async function isRootValid(depositEvents) {
  const { root } = computeDepositEventsTree(depositEvents);
  const isRootValid = await tornadoContract.methods.isKnownRoot(toHex(root)).call();

  return isRootValid;
}

async function submitTransaction(signedTX) {
  console.log('Submitting transaction to the remote node');
  await web3.eth
    .sendSignedTransaction(signedTX)
    .on('transactionHash', function (txHash) {
      console.log(`View transaction on block explorer https://${getExplorerLink()}/tx/${txHash}`);
    })
    .on('error', function (e) {
      console.error('on transactionHash error', e.message);
    });
}

async function generateTransaction(to, encodedData, value = 0) {
  const nonce = await web3.eth.getTransactionCount(senderAccount);
  let gasPrice = await fetchGasPrice();
  let gasLimit;

  async function estimateGas() {
    const fetchedGas = await web3.eth.estimateGas({
      from: senderAccount,
      to: to,
      value: value,
      nonce: nonce,
      data: encodedData
    });
    const bumped = Math.floor(fetchedGas * 1.3);
    return web3.utils.toHex(bumped);
  }

  if (encodedData) {
    gasLimit = await estimateGas();
  } else {
    gasLimit = web3.utils.toHex(23000);
  }

  const isNumRString = typeof value == 'string' || typeof value == 'number';
  const valueCost = isNumRString ? toBN(value) : value;
  const gasCosts = toBN(gasPrice).mul(toBN(gasLimit));
  const totalCosts = valueCost.add(gasCosts);

  /** Transaction details */
  console.log('Gas price: ', web3.utils.hexToNumber(gasPrice));
  console.log('Gas limit: ', web3.utils.hexToNumber(gasLimit));
  console.log('Transaction fee: ', rmDecimalBN(fromWei(gasCosts), 12), `${netSymbol}`);
  console.log('Transaction cost: ', rmDecimalBN(fromWei(totalCosts), 12), `${netSymbol}`);
  /** ----------------------------------------- **/

  function txoptions() {
    // Generate EIP-1559 transaction
    if (netId == 1) {
      return {
        to: to,
        value: value,
        nonce: nonce,
        maxFeePerGas: gasPrice,
        maxPriorityFeePerGas: web3.utils.toHex(web3.utils.toWei('3', 'gwei')),
        gas: gasLimit,
        data: encodedData
      };
    } else if (netId == 5 || netId == 137 || netId == 43114) {
      return {
        to: to,
        value: value,
        nonce: nonce,
        maxFeePerGas: gasPrice,
        maxPriorityFeePerGas: gasPrice,
        gas: gasLimit,
        data: encodedData
      };
    } else {
      return {
        to: to,
        value: value,
        nonce: nonce,
        gasPrice: gasPrice,
        gas: gasLimit,
        data: encodedData
      };
    }
  }

  if (shouldPromptConfirmation) {
    await promptConfirmation();
  }

  const tx = txoptions();
  const signed = await web3.eth.accounts.signTransaction(tx, PRIVATE_KEY);

  if (!doNotSubmitTx) {
    await submitTransaction(signed.rawTransaction);
  } else {
    console.log('\n=============Raw TX=================', '\n');
    console.log(
      `Please submit this raw tx to https://${getExplorerLink()}/pushTx, or otherwise broadcast with node cli.js broadcast command.`,
      `\n`
    );
    console.log(signed.rawTransaction, `\n`);
    console.log('=====================================', '\n');
  }
}

/**
 * Create deposit object from secret and nullifier
 */
function createDeposit({ nullifier, secret }) {
  const deposit = { nullifier, secret };
  deposit.preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)]);
  deposit.commitment = pedersenHash(deposit.preimage);
  deposit.commitmentHex = toHex(deposit.commitment);
  deposit.nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31));
  deposit.nullifierHex = toHex(deposit.nullifierHash);
  return deposit;
}

async function backupNote({ currency, amount, netId, note, noteString }) {
  try {
    await fs.writeFileSync(`./backup-tornado-${currency}-${amount}-${netId}-${note.slice(0, 10)}.txt`, noteString, 'utf8');
    console.log('Backed up deposit note as', `./backup-tornado-${currency}-${amount}-${netId}-${note.slice(0, 10)}.txt`);
  } catch (e) {
    throw new Error('Writing backup note failed:', e);
  }
}

async function backupInvoice({ currency, amount, netId, commitmentNote, invoiceString }) {
  try {
    await fs.writeFileSync(
      `./backup-tornadoInvoice-${currency}-${amount}-${netId}-${commitmentNote.slice(0, 10)}.txt`,
      invoiceString,
      'utf8'
    );
    console.log(
      'Backed up invoice as',
      `./backup-tornadoInvoice-${currency}-${amount}-${netId}-${commitmentNote.slice(0, 10)}.txt`
    );
  } catch (e) {
    throw new Error('Writing backup invoice failed:', e);
  }
}

/**
 * create a deposit invoice.
 * @param currency Сurrency
 * @param amount Deposit amount
 */
async function createInvoice({ currency, amount, chainId }) {
  const deposit = createDeposit({
    nullifier: rbigint(31),
    secret: rbigint(31)
  });
  const note = toHex(deposit.preimage, 62);
  const noteString = `tornado-${currency}-${amount}-${chainId}-${note}`;
  console.log(`Your note: ${noteString}`);

  const commitmentNote = toHex(deposit.commitment);
  const invoiceString = `tornadoInvoice-${currency}-${amount}-${chainId}-${commitmentNote}`;
  console.log(`Your invoice for deposit: ${invoiceString}`);

  await backupNote({ currency, amount, netId: chainId, note, noteString });
  await backupInvoice({ currency, amount, netId: chainId, commitmentNote, invoiceString });

  return noteString, invoiceString;
}

/**
 * Make a deposit
 * @param currency Сurrency
 * @param amount Deposit amount
 */
async function deposit({ currency, amount, commitmentNote }) {
  assert(senderAccount != null, 'Error! PRIVATE_KEY not found. Please provide PRIVATE_KEY in .env file if you deposit');
  let commitment, noteString;
  if (!commitmentNote) {
    console.log('Creating new random deposit note');
    const deposit = createDeposit({
      nullifier: rbigint(31),
      secret: rbigint(31)
    });
    const note = toHex(deposit.preimage, 62);
    noteString = `tornado-${currency}-${amount}-${netId}-${note}`;
    console.log(`Your note: ${noteString}`);
    await backupNote({ currency, amount, netId, note, noteString });
    commitment = toHex(deposit.commitment);
  } else {
    console.log('Using supplied invoice for deposit');
    commitment = toHex(commitmentNote);
  }
  if (currency === netSymbol.toLowerCase()) {
    await printETHBalance({ address: tornadoContract._address, name: 'Tornado contract' });
    await printETHBalance({ address: senderAccount, name: 'Sender account' });
    const value = isTestRPC ? ETH_AMOUNT : fromDecimals({ amount, decimals: 18 });
    console.log('Submitting deposit transaction');
    await generateTransaction(contractAddress, tornado.methods.deposit(tornadoInstance, commitment, []).encodeABI(), value);
    await printETHBalance({ address: tornadoContract._address, name: 'Tornado contract' });
    await printETHBalance({ address: senderAccount, name: 'Sender account' });
  } else {
    // a token
    await printERC20Balance({ address: tornadoContract._address, name: 'Tornado contract' });
    await printERC20Balance({ address: senderAccount, name: 'Sender account' });
    const decimals = isTestRPC ? 18 : config.deployments[`netId${netId}`]['tokens'][currency].decimals;
    const tokenAmount = isTestRPC ? TOKEN_AMOUNT : fromDecimals({ amount, decimals });
    if (isTestRPC) {
      console.log('Minting some test tokens to deposit');
      await generateTransaction(erc20Address, erc20.methods.mint(senderAccount, tokenAmount).encodeABI());
    }

    const allowance = await erc20.methods.allowance(senderAccount, tornado._address).call({ from: senderAccount });
    console.log('Current allowance is', fromWei(allowance));
    if (toBN(allowance).lt(toBN(tokenAmount))) {
      console.log('Approving tokens for deposit');
      await generateTransaction(erc20Address, erc20.methods.approve(tornado._address, tokenAmount).encodeABI());
    }

    console.log('Submitting deposit transaction');
    await generateTransaction(contractAddress, tornado.methods.deposit(tornadoInstance, commitment, []).encodeABI());
    await printERC20Balance({ address: tornadoContract._address, name: 'Tornado contract' });
    await printERC20Balance({ address: senderAccount, name: 'Sender account' });
  }

  if (!commitmentNote) {
    return noteString;
  }
}

/**
 * Generate merkle tree for a deposit.
 * Download deposit events from the tornado, reconstructs merkle tree, finds our deposit leaf
 * in it and generates merkle proof
 * @param deposit Deposit object
 */
async function generateMerkleProof(deposit, currency, amount) {
  // Get all deposit events from smart contract and assemble merkle tree from them
  const cachedEvents = await fetchEvents({ type: 'deposit', currency, amount });
  const { tree, leaves, root } = computeDepositEventsTree(cachedEvents);

  // Validate that merkle tree is valid, deposit data is correct and note not spent.
  const leafIndex = leaves.findIndex((commitment) => toBN(deposit.commitmentHex).toString(10) === commitment);
  let isValidRoot, isSpent;
  if (!isTestRPC && !multiCall) {
    const callContract = await useMultiCall([
      [tornadoContract._address, tornadoContract.methods.isKnownRoot(toHex(root)).encodeABI()],
      [tornadoContract._address, tornadoContract.methods.isSpent(toHex(deposit.nullifierHash)).encodeABI()]
    ]);
    isValidRoot = web3.eth.abi.decodeParameter('bool', callContract[0]);
    isSpent = web3.eth.abi.decodeParameter('bool', callContract[1]);
  } else {
    isValidRoot = await tornadoContract.methods.isKnownRoot(toHex(root)).call();
    isSpent = await tornadoContract.methods.isSpent(toHex(deposit.nullifierHash)).call();
  }
  assert(isValidRoot === true, 'Merkle tree is corrupted');
  assert(isSpent === false, 'The note is already spent');
  assert(leafIndex >= 0, 'The deposit is not found in the tree');

  // Compute merkle proof of our commitment
  const { pathElements, pathIndices } = tree.path(leafIndex);
  return { root, pathElements, pathIndices };
}

/**
 * Generate SNARK proof for withdrawal
 * @param deposit Deposit object
 * @param recipient Funds recipient
 * @param relayer Relayer address
 * @param fee Relayer fee
 * @param refund Receive ether for exchanged tokens
 */
async function generateProof({ deposit, currency, amount, recipient, relayerAddress = 0, fee = 0, refund = 0 }) {
  // Compute merkle proof of our commitment
  const { root, pathElements, pathIndices } = await generateMerkleProof(deposit, currency, amount);

  // Prepare circuit input
  const input = {
    // Public snark inputs
    root: root,
    nullifierHash: deposit.nullifierHash,
    recipient: bigInt(recipient),
    relayer: bigInt(relayerAddress),
    fee: bigInt(fee),
    refund: bigInt(refund),

    // Private snark inputs
    nullifier: deposit.nullifier,
    secret: deposit.secret,
    pathElements: pathElements,
    pathIndices: pathIndices
  };

  console.log('Generating SNARK proof');
  console.time('Proof time');
  const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key);
  const { proof } = websnarkUtils.toSolidityInput(proofData);
  console.timeEnd('Proof time');

  const args = [
    toHex(input.root),
    toHex(input.nullifierHash),
    toHex(input.recipient, 20),
    toHex(input.relayer, 20),
    toHex(input.fee),
    toHex(input.refund)
  ];

  return { proof, args };
}

/**
 * Do an ETH withdrawal
 * @param noteString Note to withdraw
 * @param recipient Recipient address
 */
async function withdraw({ deposit, currency, amount, recipient, relayerURL, refund = '0' }) {
  let options = {};
  if (currency === netSymbol.toLowerCase() && refund !== '0') {
    throw new Error('The ETH purchase is supposted to be 0 for ETH withdrawals');
  }
  refund = toWei(refund);
  if (relayerURL) {
    if (relayerURL.endsWith('.eth')) {
      throw new Error(
        'ENS name resolving is not supported. Please provide DNS name of the relayer. See instuctions in README.md'
      );
    }
    if (torPort) {
      options = {
        httpsAgent: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort),
        headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0' }
      };
    }
    const relayerStatus = await axios.get(relayerURL + '/status', options);

    const { rewardAccount, netId, ethPrices, tornadoServiceFee } = relayerStatus.data;
    assert(netId === (await web3.eth.net.getId()) || netId === '*', 'This relay is for different network');
    console.log('Relay address:', rewardAccount);

    const gasPrice = await fetchGasPrice();

    const decimals = isTestRPC ? 18 : config.deployments[`netId${netId}`]['tokens'][currency].decimals;
    const fee = calculateFee({
      currency,
      gasPrice,
      amount,
      refund,
      ethPrices,
      relayerServiceFee: tornadoServiceFee,
      decimals
    });
    if (fee.gt(fromDecimals({ amount, decimals }))) {
      throw new Error('Too high refund');
    }

    const { proof, args } = await generateProof({
      deposit,
      currency,
      amount,
      recipient,
      relayerAddress: rewardAccount,
      fee,
      refund
    });

    console.log('Sending withdraw transaction through relay');

    const gasCosts = toBN(gasPrice).mul(toBN(340000));
    const totalCosts = fee.add(gasCosts);

    /** Relayer fee details **/
    console.log('Transaction fee: ', rmDecimalBN(fromWei(gasCosts), 12), `${netSymbol}`);
    console.log('Relayer fee: ', rmDecimalBN(fromWei(fee), 12), `${netSymbol}`);
    console.log('Total fees: ', rmDecimalBN(fromWei(totalCosts), 12), `${netSymbol}`);
    /** -------------------- **/

    if (shouldPromptConfirmation) {
      await promptConfirmation();
    }

    try {
      const response = await axios.post(
        relayerURL + '/v1/tornadoWithdraw',
        {
          contract: tornadoInstance,
          proof,
          args
        },
        options
      );

      const { id } = response.data;

      const result = await getStatus(id, relayerURL, options);
      console.log('STATUS', result);
    } catch (e) {
      if (e.response) {
        console.error(e.response.data.error);
      } else {
        console.error(e.message);
      }
    }
  } else {
    // using private key

    // check if the address of recepient matches with the account of provided private key from environment to prevent accidental use of deposit address for withdrawal transaction.
    assert(
      recipient.toLowerCase() == senderAccount.toLowerCase(),
      'Withdrawal recepient mismatches with the account of provided private key from environment file'
    );
    const checkBalance = await web3.eth.getBalance(senderAccount);
    assert(checkBalance !== 0, 'You have 0 balance, make sure to fund account by withdrawing from tornado using relayer first');

    const { proof, args } = await generateProof({ deposit, currency, amount, recipient, refund });

    console.log('Submitting withdraw transaction');
    await generateTransaction(contractAddress, tornado.methods.withdraw(tornadoInstance, proof, ...args).encodeABI());
  }
  if (currency === netSymbol.toLowerCase()) {
    await printETHBalance({ address: recipient, name: 'Recipient' });
  } else {
    await printERC20Balance({ address: recipient, name: 'Recipient' });
  }
  console.log('Done withdrawal from Tornado Cash');
}

/**
 * Do an ETH / ERC20 send
 * @param address Recepient address
 * @param amount Amount to send
 * @param tokenAddress ERC20 token address
 */
async function send({ address, amount, tokenAddress }) {
  // using private key
  assert(senderAccount != null, 'Error! PRIVATE_KEY not found. Please provide PRIVATE_KEY in .env file if you send');
  if (tokenAddress) {
    const erc20ContractJson = require('./build/contracts/ERC20Mock.json');
    erc20 = new web3.eth.Contract(erc20ContractJson.abi, tokenAddress);
    let tokenBalance, tokenDecimals, tokenSymbol;
    if (!isTestRPC && !multiCall) {
      const callToken = await useMultiCall([
        [tokenAddress, erc20.methods.balanceOf(senderAccount).encodeABI()],
        [tokenAddress, erc20.methods.decimals().encodeABI()],
        [tokenAddress, erc20.methods.symbol().encodeABI()]
      ]);
      tokenBalance = new BigNumber(callToken[0]);
      tokenDecimals = parseInt(callToken[1]);
      tokenSymbol = web3.eth.abi.decodeParameter('string', callToken[2]);
    } else {
      tokenBalance = new BigNumber(await erc20.methods.balanceOf(senderAccount).call());
      tokenDecimals = await erc20.methods.decimals().call();
      tokenSymbol = await erc20.methods.symbol().call();
    }
    const toSend = new BigNumber(amount).times(BigNumber(10).pow(tokenDecimals));
    if (tokenBalance.lt(toSend)) {
      console.error(
        'You have',
        rmDecimalBN(tokenBalance.div(BigNumber(10).pow(tokenDecimals))),
        tokenSymbol,
        ", you can't send more than you have"
      );
      process.exit(1);
    }
    const encodeTransfer = erc20.methods.transfer(address, toSend).encodeABI();
    await generateTransaction(tokenAddress, encodeTransfer);
    console.log('Sent', amount, tokenSymbol, 'to', address);
  } else {
    const balance = new BigNumber(await web3.eth.getBalance(senderAccount));
    assert(balance.toNumber() !== 0, "You have 0 balance, can't send transaction");
    if (amount) {
      toSend = new BigNumber(amount).times(BigNumber(10).pow(18));
      if (balance.lt(toSend)) {
        console.error(
          'You have',
          rmDecimalBN(balance.div(BigNumber(10).pow(18))),
          netSymbol + ", you can't send more than you have."
        );
        process.exit(1);
      }
    } else {
      console.log('Amount not defined, sending all available amounts');
      const gasPrice = new BigNumber(await fetchGasPrice());
      const gasLimit = new BigNumber(21000);
      if (netId == 1) {
        const priorityFee = new BigNumber(await gasPrices(3));
        toSend = balance.minus(gasLimit.times(gasPrice.plus(priorityFee)));
      } else {
        toSend = balance.minus(gasLimit.times(gasPrice));
      }
    }
    await generateTransaction(address, null, toSend);
    console.log('Sent', rmDecimalBN(toSend.div(BigNumber(10).pow(18))), netSymbol, 'to', address);
  }
}

function getStatus(id, relayerURL, options) {
  return new Promise((resolve) => {
    async function getRelayerStatus() {
      const responseStatus = await axios.get(relayerURL + '/v1/jobs/' + id, options);

      if (responseStatus.status === 200) {
        const { txHash, status, confirmations, failedReason } = responseStatus.data;

        console.log(`Current job status ${status}, confirmations: ${confirmations}`);

        if (status === 'FAILED') {
          throw new Error(status + ' failed reason:' + failedReason);
        }

        if (status === 'CONFIRMED') {
          const receipt = await waitForTxReceipt({ txHash });
          console.log(
            `Transaction submitted through the relay. View transaction on block explorer https://${getExplorerLink()}/tx/${txHash}`
          );
          console.log('Transaction mined in block', receipt.blockNumber);
          resolve(status);
        }
      }

      setTimeout(() => {
        getRelayerStatus(id, relayerURL);
      }, 3000);
    }

    getRelayerStatus();
  });
}

function capitalizeFirstLetter(string) {
  return string.charAt(0).toUpperCase() + string.slice(1);
}

function fromDecimals({ amount, decimals }) {
  amount = amount.toString();
  let ether = amount.toString();
  const base = new BN('10').pow(new BN(decimals));
  const baseLength = base.toString(10).length - 1 || 1;

  const negative = ether.substring(0, 1) === '-';
  if (negative) {
    ether = ether.substring(1);
  }

  if (ether === '.') {
    throw new Error('[ethjs-unit] while converting number ' + amount + ' to wei, invalid value');
  }

  // Split it into a whole and fractional part
  const comps = ether.split('.');
  if (comps.length > 2) {
    throw new Error('[ethjs-unit] while converting number ' + amount + ' to wei,  too many decimal points');
  }

  let whole = comps[0];
  let fraction = comps[1];

  if (!whole) {
    whole = '0';
  }
  if (!fraction) {
    fraction = '0';
  }
  if (fraction.length > baseLength) {
    throw new Error('[ethjs-unit] while converting number ' + amount + ' to wei, too many decimal places');
  }

  while (fraction.length < baseLength) {
    fraction += '0';
  }

  whole = new BN(whole);
  fraction = new BN(fraction);
  let wei = whole.mul(base).add(fraction);

  if (negative) {
    wei = wei.mul(negative);
  }

  return new BN(wei.toString(10), 10);
}

function toDecimals(value, decimals, fixed) {
  const zero = new BN(0);
  const negative1 = new BN(-1);
  decimals = decimals || 18;
  fixed = fixed || 7;

  value = new BN(value);
  const negative = value.lt(zero);
  const base = new BN('10').pow(new BN(decimals));
  const baseLength = base.toString(10).length - 1 || 1;

  if (negative) {
    value = value.mul(negative1);
  }

  let fraction = value.mod(base).toString(10);
  while (fraction.length < baseLength) {
    fraction = `0${fraction}`;
  }
  fraction = fraction.match(/^([0-9]*[1-9]|0)(0*)/)[1];

  const whole = value.div(base).toString(10);
  value = `${whole}${fraction === '0' ? '' : `.${fraction}`}`;

  if (negative) {
    value = `-${value}`;
  }

  if (fixed) {
    value = value.slice(0, fixed);
  }

  return value;
}

// List fetched from https://github.com/ethereum-lists/chains/blob/master/_data/chains
function getExplorerLink() {
  switch (netId) {
    case 56:
      return 'bscscan.com';
    case 100:
      return 'blockscout.com/poa/xdai';
    case 137:
      return 'polygonscan.com';
    case 42161:
      return 'arbiscan.io';
    case 43114:
      return 'snowtrace.io';
    case 5:
      return 'goerli.etherscan.io';
    case 42:
      return 'kovan.etherscan.io';
    case 10:
      return 'optimistic.etherscan.io';
    default:
      return 'etherscan.io';
  }
}

// List fetched from https://github.com/trustwallet/assets/tree/master/blockchains
function getCurrentNetworkName() {
  switch (netId) {
    case 1:
      return 'Ethereum';
    case 56:
      return 'BinanceSmartChain';
    case 100:
      return 'GnosisChain';
    case 137:
      return 'Polygon';
    case 42161:
      return 'Arbitrum';
    case 43114:
      return 'Avalanche';
    case 5:
      return 'Goerli';
    case 42:
      return 'Kovan';
    case 10:
      return 'Optimism';
    default:
      return 'testRPC';
  }
}

function getCurrentNetworkSymbol() {
  switch (netId) {
    case 56:
      return 'BNB';
    case 100:
      return 'xDAI';
    case 137:
      return 'MATIC';
    case 43114:
      return 'AVAX';
    default:
      return 'ETH';
  }
}

function gasPricesETH(value = 80) {
  const tenPercent = (Number(value) * 5) / 100;
  const max = Math.max(tenPercent, 3);
  const bumped = Math.floor(Number(value) + max);
  return toHex(toWei(bumped.toString(), 'gwei'));
}

function gasPrices(value = 5) {
  return toHex(toWei(value.toString(), 'gwei'));
}

async function fetchGasPrice() {
  try {
    /** Gas preferences **/
    console.log('Gas speed preference: ', preferenceSpeed);
    /** ----------------------------------------------- **/

    try {
      const isLegacy = !eipGasSupport;
      const oracleOptions = { chainId: netId, defaultRpc: web3.currentProvider.host };
      const oracle = new GasPriceOracle(oracleOptions);
      const gas = await oracle.gasPrices({ isLegacy });

      if (netId === 1) {
        return gasPricesETH(gas[preferenceSpeed]);
      } else {
        return gasPrices(gas[preferenceSpeed]);
      }
    } catch (e) {
      const wei = await web3.eth.getGasPrice();
      return wei / web3.utils.unitMap.gwei;
    }
  } catch (err) {
    throw new Error(`Method fetchGasPrice has error ${err.message}`);
  }
}

function calculateFee({ currency, gasPrice, amount, refund, ethPrices, relayerServiceFee, decimals }) {
  const decimalsPoint =
    Math.floor(relayerServiceFee) === Number(relayerServiceFee) ? 0 : relayerServiceFee.toString().split('.')[1].length;
  const roundDecimal = 10 ** decimalsPoint;
  const total = toBN(fromDecimals({ amount, decimals }));
  const feePercent = total.mul(toBN(relayerServiceFee * roundDecimal)).div(toBN(roundDecimal * 100));
  const expense = toBN(gasPrice).mul(toBN(5e5));
  let desiredFee;
  switch (currency) {
    case netSymbol.toLowerCase(): {
      desiredFee = expense.add(feePercent);
      break;
    }
    default: {
      desiredFee = expense
        .add(toBN(refund))
        .mul(toBN(10 ** decimals))
        .div(toBN(ethPrices[currency]));
      desiredFee = desiredFee.add(feePercent);
      break;
    }
  }
  return desiredFee;
}

/**
 * Waits for transaction to be mined
 * @param txHash Hash of transaction
 * @param attempts
 * @param delay
 */
function waitForTxReceipt({ txHash, attempts = 60, delay = 1000 }) {
  return new Promise((resolve, reject) => {
    const checkForTx = async (txHash, retryAttempt = 0) => {
      const result = await web3.eth.getTransactionReceipt(txHash);
      if (!result || !result.blockNumber) {
        if (retryAttempt <= attempts) {
          setTimeout(() => checkForTx(txHash, retryAttempt + 1), delay);
        } else {
          reject(new Error('tx was not mined'));
        }
      } else {
        resolve(result);
      }
    };
    checkForTx(txHash);
  });
}

function initJson(file) {
  return new Promise((resolve, reject) => {
    fs.readFile(file, 'utf8', (error, data) => {
      if (error) {
        resolve([]);
      }
      try {
        resolve(JSON.parse(data));
      } catch (error) {
        resolve([]);
      }
    });
  });
}

/**
 * Erase all zero events from events tree array
 * @param events Events tree array
 */
function filterZeroEvents(events) {
  return events.filter((event) => event.transactionHash !== null);
}

function loadCachedEvents({ type, currency, amount }) {
  try {
    const module = require(`./cache/${netName.toLowerCase()}/${type}s_${currency}_${amount}.json`);

    if (module) {
      const events = module;

      return {
        events: filterZeroEvents(events),
        lastBlock: events[events.length - 1].blockNumber
      };
    }
  } catch (err) {
    console.log('Error fetching cached files, syncing from block', deployedBlockNumber);
    return {
      events: [],
      lastBlock: deployedBlockNumber
    };
  }
}

async function fetchEvents({ type, currency, amount, filterEvents }) {
  if (type === 'withdraw') {
    type = 'withdrawal';
  }
  if (filterEvents === undefined) filterEvents = true;

  const cachedEvents = loadCachedEvents({ type, currency, amount });
  const startBlock = cachedEvents.lastBlock + 1;

  console.log('Loaded cached', amount, currency.toUpperCase(), type, 'events for', startBlock, 'block');
  console.log('Fetching', amount, currency.toUpperCase(), type, 'events for', netName, 'network');

  async function updateCache(fetchedEvents) {
    try {
      const fileName = `./cache/${netName.toLowerCase()}/${type}s_${currency}_${amount}.json`;
      const localEvents = await initJson(fileName);
      const events = filterZeroEvents(localEvents).concat(fetchedEvents);
      await fs.writeFileSync(fileName, JSON.stringify(events, null, 2), 'utf8');
    } catch (error) {
      throw new Error('Writing cache file failed:', error);
    }
  }

  /**
   * Adds an zero (empty) event to the end of the events list
   * If tornado transactions on the selected currency/amount are rare and the last one was much earlier than the current block,
   * it helps to quickly synchronize the events tree
   * @param blockNumber Latest block number on selected chain
   */
  async function addZeroEvent(blockNumber) {
    const zeroEvent = { blockNumber, transactionHash: null };
    await updateCache([zeroEvent]);

    console.log('Added', amount, currency.toUpperCase(), type, 'zero event to block:', blockNumber);
  }

  async function syncEvents() {
    try {
      let targetBlock = await web3.eth.getBlockNumber();
      let chunks = 1000;
      console.log('Querying latest events from RPC');

      for (let i = startBlock; i < targetBlock; i += chunks) {
        let fetchedEvents = [];

        function mapDepositEvents() {
          fetchedEvents = fetchedEvents.map(({ blockNumber, transactionHash, returnValues }) => {
            const { commitment, leafIndex, timestamp } = returnValues;
            return {
              blockNumber,
              transactionHash,
              commitment,
              leafIndex: Number(leafIndex),
              timestamp
            };
          });
        }

        function mapWithdrawEvents() {
          fetchedEvents = fetchedEvents.map(({ blockNumber, transactionHash, returnValues }) => {
            const { nullifierHash, to, fee } = returnValues;
            return {
              blockNumber,
              transactionHash,
              nullifierHash,
              to,
              fee
            };
          });
        }

        function mapLatestEvents() {
          if (type === 'deposit') {
            mapDepositEvents();
          } else {
            mapWithdrawEvents();
          }
        }

        async function fetchWeb3Events(i) {
          let j;
          if (i + chunks - 1 > targetBlock) {
            j = targetBlock;
          } else {
            j = i + chunks - 1;
          }
          await tornadoContract
            .getPastEvents(capitalizeFirstLetter(type), {
              fromBlock: i,
              toBlock: j
            })
            .then(
              (r) => {
                fetchedEvents = fetchedEvents.concat(r);
                console.log('Fetched', amount, currency.toUpperCase(), type, 'events to block:', j);
              },
              (err) => {
                console.error(i + ' failed fetching', type, 'events from node', err);
                process.exit(1);
              }
            )
            .catch(console.log);

          mapLatestEvents();
        }

        await fetchWeb3Events(i);
        await updateCache(fetchedEvents);
      }

      await addZeroEvent(targetBlock);
    } catch (error) {
      console.log(error);
      throw new Error('Error while updating cache');
    }
  }

  async function syncGraphEvents() {
    let options = {};
    if (torPort) {
      options = {
        httpsAgent: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort),
        headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0' }
      };
    }

    async function queryLatestTimestamp() {
      try {
        const variables = {
          currency: currency.toString(),
          amount: amount.toString()
        };
        if (type === 'deposit') {
          const query = {
            query: `
            query($currency: String, $amount: String){
              deposits(first: 1, orderBy: timestamp, orderDirection: desc, where: {currency: $currency, amount: $amount}) {
                timestamp
              }
            }
            `,
            variables
          };
          const querySubgraph = await axios.post(subgraph, query, options);
          const queryResult = querySubgraph.data.data.deposits;
          const result = queryResult[0].timestamp;
          return Number(result);
        } else {
          const query = {
            query: `
            query($currency: String, $amount: String){
              withdrawals(first: 1, orderBy: timestamp, orderDirection: desc, where: {currency: $currency, amount: $amount}) {
                timestamp
              }
            }
            `,
            variables
          };
          const querySubgraph = await axios.post(subgraph, query, options);
          const queryResult = querySubgraph.data.data.withdrawals;
          const result = queryResult[0].timestamp;
          return Number(result);
        }
      } catch (error) {
        console.error('Failed to fetch latest event from thegraph');
      }
    }

    async function queryFromGraph(timestamp) {
      try {
        const variables = {
          currency: currency.toString(),
          amount: amount.toString(),
          timestamp: timestamp
        };
        if (type === 'deposit') {
          const query = {
            query: `
            query($currency: String, $amount: String, $timestamp: Int){
              deposits(orderBy: timestamp, first: 1000, where: {currency: $currency, amount: $amount, timestamp_gt: $timestamp}) {
                blockNumber
                transactionHash
                commitment
                index
                timestamp
              }
            }
            `,
            variables
          };
          const querySubgraph = await axios.post(subgraph, query, options);
          const queryResult = querySubgraph.data.data.deposits;
          const mapResult = queryResult.map(({ blockNumber, transactionHash, commitment, index, timestamp }) => {
            return {
              blockNumber: Number(blockNumber),
              transactionHash,
              commitment,
              leafIndex: Number(index),
              timestamp
            };
          });
          return mapResult;
        } else {
          const query = {
            query: `
            query($currency: String, $amount: String, $timestamp: Int){
              withdrawals(orderBy: timestamp, first: 1000, where: {currency: $currency, amount: $amount, timestamp_gt: $timestamp}) {
                blockNumber
                transactionHash
                nullifier
                to
                fee
              }
            }
            `,
            variables
          };
          const querySubgraph = await axios.post(subgraph, query, options);
          const queryResult = querySubgraph.data.data.withdrawals;
          const mapResult = queryResult.map(({ blockNumber, transactionHash, nullifier, to, fee }) => {
            return {
              blockNumber: Number(blockNumber),
              transactionHash,
              nullifierHash: nullifier,
              to,
              fee
            };
          });
          return mapResult;
        }
      } catch (error) {
        console.error(error);
      }
    }

    async function fetchGraphEvents() {
      console.log('Querying latest events from TheGraph');
      const latestTimestamp = await queryLatestTimestamp();
      if (latestTimestamp) {
        const getCachedBlock = await web3.eth.getBlock(startBlock);
        const cachedTimestamp = getCachedBlock.timestamp;
        for (let i = cachedTimestamp; i < latestTimestamp; ) {
          const result = await queryFromGraph(i);
          if (Object.keys(result).length === 0) {
            i = latestTimestamp;
          } else {
            if (type === 'deposit') {
              const resultBlock = result[result.length - 1].blockNumber;
              const resultTimestamp = result[result.length - 1].timestamp;
              await updateCache(result);
              i = resultTimestamp;
              console.log('Fetched', amount, currency.toUpperCase(), type, 'events to block:', Number(resultBlock));
            } else {
              const resultBlock = result[result.length - 1].blockNumber;
              const getResultBlock = await web3.eth.getBlock(resultBlock);
              const resultTimestamp = getResultBlock.timestamp;
              await updateCache(result);
              i = resultTimestamp;
              console.log('Fetched', amount, currency.toUpperCase(), type, 'events to block:', Number(resultBlock));
            }
          }
        }
      } else {
        console.log('Fallback to web3 events');
        await syncEvents();
      }
    }
    await fetchGraphEvents();
  }
  if (!privateRpc && !subgraph && !isTestRPC) {
    await syncGraphEvents();
  } else {
    await syncEvents();
  }

  async function loadUpdatedEvents() {
    const fileName = `./cache/${netName.toLowerCase()}/${type}s_${currency}_${amount}.json`;
    const updatedEvents = await initJson(fileName);
    const updatedBlock = updatedEvents[updatedEvents.length - 1].blockNumber;
    console.log('Cache updated for Tornado', type, amount, currency, 'instance to block', updatedBlock, 'successfully');
    console.log(`Total ${type}s:`, updatedEvents.length);
    return updatedEvents;
  }
  const events = await loadUpdatedEvents();
  return filterEvents ? filterZeroEvents(events) : events;
}

/**
 * Parses Tornado.cash note
 * @param noteString the note
 */
function parseNote(noteString) {
  const noteRegex = /tornado-(?<currency>\w+)-(?<amount>[\d.]+)-(?<netId>\d+)-0x(?<note>[0-9a-fA-F]{124})/g;
  const match = noteRegex.exec(noteString);
  if (!match) {
    throw new Error('The note has invalid format');
  }

  const buf = Buffer.from(match.groups.note, 'hex');
  const nullifier = bigInt.leBuff2int(buf.slice(0, 31));
  const secret = bigInt.leBuff2int(buf.slice(31, 62));
  const deposit = createDeposit({ nullifier, secret });
  const netId = Number(match.groups.netId);

  return {
    currency: match.groups.currency,
    amount: match.groups.amount,
    netId,
    deposit
  };
}

/**
 * Parses Tornado.cash deposit invoice
 * @param invoiceString the note
 */
function parseInvoice(invoiceString) {
  const noteRegex = /tornadoInvoice-(?<currency>\w+)-(?<amount>[\d.]+)-(?<netId>\d+)-0x(?<commitmentNote>[0-9a-fA-F]{64})/g;
  const match = noteRegex.exec(invoiceString);
  if (!match) {
    throw new Error('The note has invalid format');
  }

  const netId = Number(match.groups.netId);
  const buf = Buffer.from(match.groups.commitmentNote, 'hex');
  const commitmentNote = toHex(buf.slice(0, 32));

  return {
    currency: match.groups.currency,
    amount: match.groups.amount,
    netId,
    commitmentNote
  };
}

async function loadDepositData({ amount, currency, deposit }) {
  try {
    const cachedEvents = await fetchEvents({ type: 'deposit', currency, amount });
    const eventWhenHappened = await cachedEvents.filter(function (event) {
      return event.commitment === deposit.commitmentHex;
    })[0];

    if (eventWhenHappened.length === 0) {
      throw new Error('There is no related deposit, the note is invalid');
    }

    const timestamp = eventWhenHappened.timestamp;
    const txHash = eventWhenHappened.transactionHash;
    const isSpent = await tornadoContract.methods.isSpent(deposit.nullifierHex).call();
    const receipt = await web3.eth.getTransactionReceipt(txHash);

    return {
      timestamp,
      txHash,
      isSpent,
      from: receipt.from,
      commitment: deposit.commitmentHex
    };
  } catch (e) {
    console.error('loadDepositData', e);
  }
  return {};
}
async function loadWithdrawalData({ amount, currency, deposit }) {
  try {
    const cachedEvents = await fetchEvents({ type: 'withdrawal', currency, amount });

    const withdrawEvent = cachedEvents.filter((event) => {
      return event.nullifierHash === deposit.nullifierHex;
    })[0];

    const fee = withdrawEvent.fee;
    const decimals = config.deployments[`netId${netId}`]['tokens'][currency].decimals;
    const withdrawalAmount = toBN(fromDecimals({ amount, decimals })).sub(toBN(fee));
    const { timestamp } = await web3.eth.getBlock(withdrawEvent.blockNumber);
    return {
      amount: toDecimals(withdrawalAmount, decimals, 9),
      txHash: withdrawEvent.transactionHash,
      to: withdrawEvent.to,
      timestamp,
      nullifier: deposit.nullifierHex,
      fee: toDecimals(fee, decimals, 9)
    };
  } catch (e) {
    console.error('loadWithdrawalData', e);
  }
}

function statePreferences(program) {
  const isPref = gasSpeedPreferences.includes(program.gas_speed);

  if (program.gas_speed && !isPref) {
    throw new Error('Invalid gas speed preference');
  } else if (program.gas_speed) {
    preferenceSpeed = program.gas_speed;
  }

  if (program.noconfirmation) {
    shouldPromptConfirmation = false;
  }
  if (program.onlyRpc) {
    privateRpc = true;
  }
  if (program.tor) {
    torPort = program.tor;
  }
}

async function promptConfirmation() {
  const query = 'Confirm the transaction [Y/n] ';
  const confirmation = await new Promise((resolve) => prompt.question(query, resolve));

  if (confirmation.toUpperCase() !== 'Y') {
    throw new Error('Transaction rejected');
  }
}

/**
 * Init web3, contracts, and snark
 */
async function init({ rpc, noteNetId, currency = 'dai', amount = '100', balanceCheck, localMode, privateKey }) {
  let contractJson, instanceJson, erc20ContractJson, erc20tornadoJson, tornadoAddress, tokenAddress;
  let ipOptions = {};

  if (torPort && rpc.includes('https')) {
    console.log('Using tor network');
    web3Options = { agent: { https: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort) }, timeout: 60000 };
    // Use forked web3-providers-http from local file to modify user-agent header value which improves privacy.
    web3 = new Web3(new Web3HttpProvider(rpc, web3Options), null, { transactionConfirmationBlocks: 1 });
    ipOptions = {
      httpsAgent: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort),
      headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0' }
    };
  } else if (torPort && rpc.includes('http')) {
    console.log('Using tor network');
    web3Options = { agent: { http: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort) }, timeout: 60000 };
    // Use forked web3-providers-http from local file to modify user-agent header value which improves privacy.
    web3 = new Web3(new Web3HttpProvider(rpc, web3Options), null, { transactionConfirmationBlocks: 1 });
    ipOptions = {
      httpsAgent: new SocksProxyAgent('socks5h://127.0.0.1:' + torPort),
      headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0' }
    };
  } else if (rpc.includes('ipc')) {
    console.log('Using ipc connection');
    web3 = new Web3(new Web3.providers.IpcProvider(rpc, net), null, { transactionConfirmationBlocks: 1 });
  } else if (rpc.includes('ws') || rpc.includes('wss')) {
    console.log('Using websocket connection (Note: Tor is not supported for Websocket providers)');
    web3Options = {
      clientConfig: { keepalive: true, keepaliveInterval: -1 },
      reconnect: { auto: true, delay: 1000, maxAttempts: 10, onTimeout: false }
    };
    web3 = new Web3(new Web3.providers.WebsocketProvider(rpc, web3Options), net, { transactionConfirmationBlocks: 1 });
  } else {
    console.log('Connecting to remote node');
    web3 = new Web3(rpc, null, { transactionConfirmationBlocks: 1 });
  }

  const rpcHost = new URL(rpc).hostname;
  const isIpPrivate = is_ip_private(rpcHost);

  if (!isIpPrivate && !rpc.includes('localhost') && !privateRpc) {
    try {
      const fetchRemoteIP = await axios.get('https://ip.tornado.cash', ipOptions);
      const { country, ip } = fetchRemoteIP.data;
      console.log('Your remote IP address is', ip, 'from', country + '.');
    } catch (error) {
      console.error('Could not fetch remote IP from ip.tornado.cash, use VPN if the problem repeats.');
    }
  } else if (isIpPrivate || rpc.includes('localhost')) {
    console.log('Local RPC detected');
    privateRpc = true;
  }

  contractJson = require('./build/contracts/TornadoProxy.abi.json');
  instanceJson = require('./build/contracts/Instance.abi.json');
  circuit = require('./build/circuits/tornado.json');
  proving_key = fs.readFileSync('build/circuits/tornadoProvingKey.bin').buffer;
  MERKLE_TREE_HEIGHT = process.env.MERKLE_TREE_HEIGHT || 20;
  ETH_AMOUNT = process.env.ETH_AMOUNT;
  TOKEN_AMOUNT = process.env.TOKEN_AMOUNT;
  const privKey = privateKey || process.env.PRIVATE_KEY;

  if (privKey) {
    if (privKey.startsWith('0x')) {
      PRIVATE_KEY = privKey.substring(2);
    } else {
      PRIVATE_KEY = privKey;
    }
  }
  if (PRIVATE_KEY) {
    const account = web3.eth.accounts.privateKeyToAccount('0x' + PRIVATE_KEY);
    web3.eth.accounts.wallet.add('0x' + PRIVATE_KEY);
    web3.eth.defaultAccount = account.address;
    senderAccount = account.address;
  }

  erc20ContractJson = require('./build/contracts/ERC20Mock.json');
  erc20tornadoJson = require('./build/contracts/ERC20Tornado.json');
  // groth16 initialises a lot of Promises that will never be resolved, that's why we need to use process.exit to terminate the CLI
  groth16 = await buildGroth16();
  netId = await web3.eth.net.getId();
  netName = getCurrentNetworkName();
  netSymbol = getCurrentNetworkSymbol();

  if (noteNetId && Number(noteNetId) !== netId) {
    throw new Error('This note is for a different network. Specify the --rpc option explicitly');
  }
  if (netName === 'testRPC') {
    isTestRPC = true;
  }
  if (localMode) {
    console.log('Local mode detected: will not submit signed TX to remote node');
    doNotSubmitTx = true;
  }

  if (isTestRPC) {
    tornadoAddress =
      currency === netSymbol.toLowerCase() ? contractJson.networks[netId].address : erc20tornadoJson.networks[netId].address;
    tokenAddress = currency !== netSymbol.toLowerCase() ? erc20ContractJson.networks[netId].address : null;
    deployedBlockNumber = 0;
    senderAccount = (await web3.eth.getAccounts())[0];
  } else {
    try {
      if (balanceCheck) {
        currency = netSymbol.toLowerCase();
        amount = Object.keys(config.deployments[`netId${netId}`][currency].instanceAddress)[0];
      }
      tornadoAddress = config.deployments[`netId${netId}`].proxy;
      multiCall = config.deployments[`netId${netId}`].multicall;
      subgraph = config.deployments[`netId${netId}`].subgraph;
      tornadoInstance = config.deployments[`netId${netId}`]['tokens'][currency].instanceAddress[amount];
      deployedBlockNumber = config.deployments[`netId${netId}`]['tokens'][currency].deployedBlockNumber[amount];

      if (!tornadoAddress) {
        throw new Error();
      }
      tokenAddress =
        currency !== netSymbol.toLowerCase() ? config.deployments[`netId${netId}`]['tokens'][currency].tokenAddress : null;
    } catch (e) {
      console.error('There is no such tornado instance, check the currency and amount you provide', e);
      process.exit(1);
    }
  }
  tornado = new web3.eth.Contract(contractJson, tornadoAddress);
  tornadoContract = new web3.eth.Contract(instanceJson, tornadoInstance);
  contractAddress = tornadoAddress;
  erc20 = currency !== netSymbol.toLowerCase() ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : {};
  erc20Address = tokenAddress;
}

async function main() {
  program
    .option('-r, --rpc <URL>', 'The RPC that CLI should interact with', 'http://localhost:8545')
    .option('-R, --relayer <URL>', 'Withdraw via relayer')
    .option('-T, --tor <PORT>', 'Optional tor port')
    .option('-p, --private-key <KEY>', "Wallet private key - If you didn't add it to .env file and it is needed for operation")
    .option('-S --gas-speed <SPEED>', 'Gas speed preference [ instant, fast, standard, low ]')
    .option('-N --noconfirmation', 'No confirmation mode - Does not query confirmation ')
    .option('-L, --local-rpc', 'Local node mode - Does not submit signed transaction to the node')
    .option('-o, --only-rpc', 'Only rpc mode - Does not enable thegraph api nor remote ip detection');
  program
    .command('createNote <currency> <amount> <chainId>')
    .description(
      'Create deposit note and invoice, allows generating private key like deposit notes from secure, offline environment. The currency is one of (ETH|DAI|cDAI|USDC|cUSDC|USDT). The amount depends on currency, see config.js file or visit https://tornado.cash.'
    )
    .action(async (currency, amount, chainId) => {
      currency = currency.toLowerCase();
      await createInvoice({ currency, amount, chainId });
    });
  program
    .command('depositInvoice <invoice>')
    .description('Submit a deposit of invoice from default eth account and return the resulting note.')
    .action(async (invoice) => {
      statePreferences(program);

      const { currency, amount, netId, commitmentNote } = parseInvoice(invoice);
      await init({
        rpc: program.rpc,
        currency,
        amount,
        localMode: program.localRpc,
        privateKey: program.privateKey,
        noteNetId: netId
      });
      console.log('Creating', currency.toUpperCase(), amount, 'deposit for', netName, 'Tornado Cash Instance');
      await deposit({ currency, amount, commitmentNote });
    });
  program
    .command('deposit <currency> <amount>')
    .description(
      'Submit a deposit of specified currency and amount from default eth account and return the resulting note. The currency is one of (ETH|DAI|cDAI|USDC|cUSDC|USDT). The amount depends on currency, see config.js file or visit https://tornado.cash.'
    )
    .action(async (currency, amount) => {
      currency = currency.toLowerCase();

      statePreferences(program);

      await init({ rpc: program.rpc, currency, amount, localMode: program.localRpc, privateKey: program.privateKey });
      await deposit({ currency, amount });
    });
  program
    .command('withdraw <note> <recipient> [ETH_purchase]')
    .description(
      'Withdraw a note to a recipient account using relayer or specified private key. You can exchange some of your deposit`s tokens to ETH during the withdrawal by specifing ETH_purchase (e.g. 0.01) to pay for gas in future transactions. Also see the --relayer option.'
    )
    .action(async (noteString, recipient, refund) => {
      statePreferences(program);

      const { currency, amount, netId, deposit } = parseNote(noteString);

      await init({
        rpc: program.rpc,
        noteNetId: netId,
        currency,
        amount,
        localMode: program.localRpc,
        privateKey: program.privateKey
      });
      await withdraw({
        deposit,
        currency,
        amount,
        recipient,
        refund,
        relayerURL: program.relayer
      });
    });
  program
    .command('balance [address] [token_address]')
    .description('Check ETH and ERC20 balance')
    .action(async (address, tokenAddress) => {
      statePreferences(program);

      await init({ rpc: program.rpc, balanceCheck: true });
      if (!address && senderAccount) {
        console.log('Using address', senderAccount, 'from private key');
        address = senderAccount;
      }
      await printETHBalance({ address, name: 'Account' });
      if (tokenAddress) {
        await printERC20Balance({ address, name: 'Account', tokenAddress });
      }
    });
  program
    .command('send <address> [amount] [token_address]')
    .description('Send ETH or ERC to address')
    .action(async (address, amount, tokenAddress) => {
      statePreferences(program);

      await init({ rpc: program.rpc, balanceCheck: true, localMode: program.localRpc, privateKey: program.privateKey });
      await send({ address, amount, tokenAddress });
    });
  program
    .command('broadcast <signedTX>')
    .description('Submit signed TX to the remote node')
    .action(async (signedTX) => {
      statePreferences(program);

      await init({ rpc: program.rpc, balanceCheck: true });
      await submitTransaction(signedTX);
    });
  program
    .command('compliance <note>')
    .description(
      'Shows the deposit and withdrawal of the provided note. This might be necessary to show the origin of assets held in your withdrawal address.'
    )
    .action(async (noteString) => {
      statePreferences(program);

      const { currency, amount, netId, deposit } = parseNote(noteString);

      await init({ rpc: program.rpc, noteNetId: netId, currency, amount });
      const depositInfo = await loadDepositData({ amount, currency, deposit });
      const depositDate = new Date(depositInfo.timestamp * 1000);
      console.log('\n=============Deposit=================');
      console.log('Deposit     :', amount, currency.toUpperCase());
      console.log('Date        :', depositDate.toLocaleDateString(), depositDate.toLocaleTimeString());
      console.log('From        :', `https://${getExplorerLink()}/address/${depositInfo.from}`);
      console.log('Transaction :', `https://${getExplorerLink()}/tx/${depositInfo.txHash}`);
      console.log('Commitment  :', depositInfo.commitment);
      console.log('Spent       :', depositInfo.isSpent);
      if (!depositInfo.isSpent) {
        console.log('The note was not spent');
        return;
      }
      console.log('=====================================', '\n');
      const withdrawInfo = await loadWithdrawalData({ amount, currency, deposit });
      const withdrawalDate = new Date(withdrawInfo.timestamp * 1000);
      console.log('\n=============Withdrawal==============');
      console.log('Withdrawal  :', withdrawInfo.amount, currency);
      console.log('Relayer Fee :', withdrawInfo.fee, currency);
      console.log('Date        :', withdrawalDate.toLocaleDateString(), withdrawalDate.toLocaleTimeString());
      console.log('To          :', `https://${getExplorerLink()}/address/${withdrawInfo.to}`);
      console.log('Transaction :', `https://${getExplorerLink()}/tx/${withdrawInfo.txHash}`);
      console.log('Nullifier   :', withdrawInfo.nullifier);
      console.log('=====================================', '\n');
    });
  program
    .command('syncEvents <type> <currency> <amount>')
    .description('Sync the local cache file of deposit / withdrawal events for specific currency.')
    .action(async (type, currency, amount) => {
      currency = currency.toLowerCase();

      statePreferences(program);
      console.log('Starting event sync command');

      await init({ rpc: program.rpc, type, currency, amount });
      const cachedEvents = await fetchEvents({ type, currency, amount, filterEvents: false });
      console.log(
        'Synced event for',
        type,
        amount,
        currency.toUpperCase(),
        netName,
        'Tornado instance to block',
        cachedEvents[cachedEvents.length - 1].blockNumber
      );
    });
  program
    .command('checkCacheValidity <currency> <amount>')
    .description('Check cache file of deposit events for specific currency for validity of the root.')
    .action(async (currency, amount) => {
      statePreferences(program);

      const type = 'deposit';

      await init({ rpc: program.rpc, type, currency: currency.toLowerCase(), amount });
      const depositCachedEvents = await fetchEvents({ type, currency, amount });
      const isValidRoot = await isRootValid(depositCachedEvents);

      console.log(
        '\nDeposit events tree for',
        amount,
        currency.toUpperCase(),
        'on',
        netName,
        'chain',
        isValidRoot ? 'has valid root' : 'is invalid, unknown root. You need to reset cache to zero array or to latest git state'
      );
    });
  program.command('parseNote <note>').action(async (noteString) => {
    const parse = parseNote(noteString);

    netId = parse.netId;
    netName = getCurrentNetworkName();

    console.log('\n=============Note=================');
    console.log('Network:', netName);
    console.log('Denomination:', parse.amount, parse.currency.toUpperCase());
    console.log('Commitment: ', parse.deposit.commitmentHex);
    console.log('Nullifier Hash: ', parse.deposit.nullifierHex);
    console.log('=====================================', '\n');
  });
  program
    .command('test')
    .description('Perform an automated test. It deposits and withdraws one ETH and one ERC20 note. Uses ganache.')
    .action(async () => {
      privateRpc = true;
      console.log('Start performing ETH deposit-withdraw test');
      let currency = 'eth';
      let amount = '0.1';
      await init({ rpc: program.rpc, currency, amount, privateKey: program.privateKey });
      let noteString = await deposit({ currency, amount });
      let parsedNote = parseNote(noteString);
      await withdraw({
        deposit: parsedNote.deposit,
        currency,
        amount,
        recipient: senderAccount,
        relayerURL: program.relayer
      });

      console.log('\nStart performing DAI deposit-withdraw test');
      currency = 'dai';
      amount = '100';
      await init({ rpc: program.rpc, currency, amount });
      noteString = await deposit({ currency, amount });
      parsedNote = parseNote(noteString);
      await withdraw({
        deposit: parsedNote.deposit,
        currency,
        amount,
        recipient: senderAccount,
        refund: '0.02',
        relayerURL: program.relayer
      });
    });
  try {
    await program.parseAsync(process.argv);
    process.exit(0);
  } catch (e) {
    console.log('Error:', e);
    process.exit(1);
  }
}

main();