import { Just } from 'folktale/maybe';
import Tx from 'ethereumjs-tx';

import * as azimuth from 'azimuth-js';
import * as kg from 'urbit-key-generation/dist';
import * as wg from './walletgen';
import * as tank from './tank';

import JSZip from 'jszip';
import saveAs from 'file-saver';

import { sendSignedTransaction, hexify } from './txn';
import { attemptNetworkSeedDerivation } from './keys';
import { addHexPrefix, WALLET_TYPES } from './wallet';

const INVITE_STAGES = {
  INVITE_LOGIN: 'invite login',
  INVITE_WALLET: 'invite wallet',
  INVITE_VERIFY: 'invite verify',
  INVITE_TRANSACTIONS: 'invite transactions',
};

const WALLET_STATES = {
  UNLOCKING: 'Unlocking invite wallet',
  GENERATING: 'Generating your wallet',
  RENDERING: 'Creating paper collateral',
  PAPER_READY: 'Download your wallet',
  DOWNLOADED: 'Wallet downloaded',
  TRANSACTIONS: 'Sending transactions',
};

const TRANSACTION_STATES = {
  GENERATING: {
    label: 'Generating Transactions...',
    progress: 0.0,
  },
  SIGNING: {
    label: 'Signing Transactions...',
    progress: 0.15,
  },
  FUNDING_INVITE: {
    label: 'Funding Invite Wallet...',
    progress: 0.3,
  },
  CLAIMING: {
    label: 'Claiming Invite...',
    progress: 0.55,
  },
  FUNDING_RECIPIENT: {
    label: 'Funding Recipient Wallet...',
    progress: 0.65,
  },
  CONFIGURING: {
    label: 'Configuring Point...',
    progress: 0.85,
  },
  CLEANING: {
    label: 'Cleaning Up...',
    progress: 0.95,
  },
  DONE: {
    label: 'Done',
    progress: 1.0,
  },
};

async function generateWallet(point) {
  const ticket = await wg.makeTicket(point);
  const wallet = await wg.generateWallet(point, ticket);
  return wallet;
}

//TODO should be moved to lib/walletgen
async function downloadWallet(paper) {
  return new Promise((resolve, reject) => {
    const zip = new JSZip();
    //TODO the categories here aren't explained in bridge at all...

    const bin0 = paper.filter(item => item.bin === '0');
    const bin1 = paper.filter(item => item.bin === '1');
    const bin2 = paper.filter(item => item.bin === '2');
    const bin3 = paper.filter(item => item.bin === '3');
    const bin4 = paper.filter(item => item.bin === '4');

    const bin0Folder = zip.folder('0. Public');
    const bin1Folder = zip.folder('1. Very High Friction Custody');
    const bin2Folder = zip.folder('2. High Friction Custody');
    const bin3Folder = zip.folder('3. Medium Friction Custody');
    const bin4Folder = zip.folder('4. Low Friction Custody');

    bin0.forEach(item => bin0Folder.file(`${item.pageTitle}.png`, item.png));
    bin1.forEach(item => bin1Folder.file(`${item.pageTitle}.png`, item.png));
    bin2.forEach(item => bin2Folder.file(`${item.pageTitle}.png`, item.png));
    bin3.forEach(item => bin3Folder.file(`${item.pageTitle}.png`, item.png));
    bin4.forEach(item => bin4Folder.file(`${item.pageTitle}.png`, item.png));

    zip.generateAsync({ type: 'blob' }).then(content => {
      saveAs(content, 'urbit-wallet.zip');
      resolve(true);
    });
  });
}

async function claimPointFromInvite({
  inviteWallet,
  wallet,
  point,
  web3,
  contracts,
  onUpdate,
}) {
  const askForFunding = (address, minBalance, balance) =>
    onUpdate({
      type: 'askFunding',
      value: { address, minBalance, balance },
    });

  const gotFunding = () => onUpdate({ type: 'gotFunding' });
  const progress = state => onUpdate({ type: 'progress', state });

  const inviteAddress = inviteWallet.address;

  progress(TRANSACTION_STATES.GENERATING);

  // transfer from invite wallet to new wallet
  const transferTx = azimuth.ecliptic.transferPoint(
    contracts,
    point,
    wallet.ownership.keys.address
  );
  transferTx.gas = 500000; //TODO can maybe be lower?

  // ping gas tank with txs if needed
  let inviteNonce = await web3.eth.getTransactionCount(inviteAddress);
  transferTx.nonce = inviteNonce++;
  transferTx.gasPrice = 20000000000; //NOTE we pay the premium for faster ux
  transferTx.from = inviteAddress;

  progress(TRANSACTION_STATES.SIGNING);
  // NOTE: using web3.eth.accounts.signTransaction is broken (1.0.0-beta51)
  const transferStx = new Tx(transferTx);
  transferStx.sign(inviteWallet.privateKey);
  const rawTransferStx = hexify(transferStx.serialize());
  const transferCost = transferTx.gas * transferTx.gasPrice;

  progress(TRANSACTION_STATES.FUNDING_INVITE);

  let usedTank = await tank.ensureFundsFor(
    web3,
    point,
    inviteAddress,
    transferCost,
    [rawTransferStx],
    askForFunding,
    gotFunding
  );

  progress(TRANSACTION_STATES.CLAIMING);

  // send transaction
  await sendAndAwaitConfirm(web3, [Just(transferStx)], usedTank);

  //
  // we're gonna be operating as the new wallet from here on out, so change
  // the relevant values
  //
  const newAddress = wallet.ownership.keys.address;

  // configure management proxy
  const managementTx = azimuth.ecliptic.setManagementProxy(
    contracts,
    point,
    wallet.management.keys.address
  );
  managementTx.gas = 200000;
  managementTx.nonce = 0;

  // configure networking public keys
  //TODO feels like more of this logic should live in a lib?
  const seed = await attemptNetworkSeedDerivation(true, {
    walletType: WALLET_TYPES.TICKET,
    urbitWallet: Just(wallet),
    pointCursor: Just(point),
    pointCache: { [point]: { keyRevisionNumber: 0 } },
  });

  const networkSeed = seed.matchWith({
    Nothing: () => {
      throw new Error('network seed not derived');
    },
    Just: p => p.value,
  });

  const networkKeys = kg.deriveNetworkKeys(networkSeed);

  let keysTx = azimuth.ecliptic.configureKeys(
    contracts,
    point,
    addHexPrefix(networkKeys.crypt.public),
    addHexPrefix(networkKeys.auth.public),
    1,
    false
  );
  keysTx.gas = 150000;
  keysTx.nonce = 1;

  //TODO  refactor this process into function
  let totalCost = 0;
  let txs = [managementTx, keysTx];
  txs = txs.map(tx => {
    tx.gasPrice = 20000000000;
    tx.from = newAddress;
    totalCost = totalCost + tx.gasPrice * tx.gas;
    return tx;
  });

  let txPairs = txs.map(tx => {
    let stx = new Tx(tx);
    stx.sign(Buffer.from(wallet.ownership.keys.private, 'hex'));
    return {
      raw: '0x' + stx.serialize().toString('hex'),
      signed: stx,
    };
  });

  progress(TRANSACTION_STATES.FUNDING_RECIPIENT);

  usedTank = await tank.ensureFundsFor(
    web3,
    point,
    newAddress,
    totalCost,
    txPairs.map(p => p.raw),
    askForFunding
  );

  progress(TRANSACTION_STATES.CONFIGURING);

  await sendAndAwaitConfirm(web3, txPairs.map(p => Just(p.signed)), usedTank);

  progress(TRANSACTION_STATES.CLEANING);

  // if non-trivial eth left in invite wallet, transfer to new ownership
  let balance = await web3.eth.getBalance(inviteAddress);
  const gasPrice = 20000000000;
  const gasLimit = 21000;
  const sendEthCost = gasPrice * gasLimit;
  if (balance > sendEthCost) {
    const value = balance - sendEthCost;
    console.log('sending', value);
    const tx = {
      to: newAddress,
      value: value,
      gasPrice: gasPrice,
      gas: gasLimit,
      nonce: inviteNonce++,
    };
    let stx = new Tx(tx);
    stx.sign(inviteWallet.privateKey);
    const rawTx = hexify(stx.serialize());
    web3.eth.sendSignedTransaction(rawTx).catch(err => {
      console.log('error sending value tx, who cares', err);
    });
    console.log('sent old balance');
  }

  progress(TRANSACTION_STATES.DONE);
}

async function sendAndAwaitConfirm(web3, signedTxs, usedTank) {
  await Promise.all(
    signedTxs.map(tx => {
      return new Promise((resolve, reject) => {
        sendSignedTransaction(web3, tx, usedTank, resolve);
      });
    })
  );
}

export {
  generateWallet,
  downloadWallet,
  claimPointFromInvite,
  INVITE_STAGES,
  WALLET_STATES,
  TRANSACTION_STATES,
};