const reverse = require("buffer-reverse");
const zmq = require("zeromq");
const { Op } = require("sequelize");
const bitcoin = require("elementsjs-lib");

const zmqRawBlock = zmq.socket("sub");
zmqRawBlock.connect(config.liquid.zmqrawblock);
zmqRawBlock.subscribe("rawblock");

const zmqRawTx = zmq.socket("sub");
zmqRawTx.connect("tcp://127.0.0.1:18603");
zmqRawTx.subscribe("rawtx");

const asset = 'LBTC';

zmqRawTx.on("message", async (topic, message, sequence) => {
  const hex = message.toString("hex");
  const unblinded = await lq.unblindRawTransaction(hex);
  const tx = await lq.decodeRawTransaction(unblinded.hex);
  const blinded = await lq.decodeRawTransaction(hex);
  if (payments.includes(blinded.txid)) return;

  Promise.all(
    tx.vout.map(async o => {
      if (!o.asset || o.asset !== config.liquid.btcasset) return;
      if (!(o.scriptPubKey && o.scriptPubKey.addresses)) return;

      const value = toSats(o.value);
      const address = o.scriptPubKey.addresses[0];

      if (Object.keys(addresses).includes(address)) {
        let user = await db.User.findOne({
          where: {
            username: addresses[address]
          }
        });

        const invoice = await db.Invoice.findOne({
          where: {
            user_id: user.id,
            asset,
          },
          order: [ [ 'id', 'DESC' ]]
        });

        const currency = invoice ? invoice.currency : user.currency;
        const rate = invoice ? invoice.rate : app.get("rates")[user.currency];
        const tip = invoice ? invoice.tip : null;

        let confirmed = 0;

        user.pending += value;
        user.confidential = await lq.getNewAddress();
        user.liquid = (await lq.getAddressInfo(user.confidential)).unconfidential;

        await user.save();
        emit(user.username, "user", user);

        addresses[user.liquid] = user.username;

        const payment = await db.Payment.create({
          user_id: user.id,
          hash: blinded.txid,
          amount: value - tip,
          currency,
          rate,
          received: true,
          tip,
          confirmed,
          address,
          asset,
        });
        payments.push(blinded.txid);

        l.info("liquid detected", user.username, value);
        emit(user.username, "payment", payment);
      }
    })
  );
});

let queue = {};

zmqRawBlock.on("message", async (topic, message, sequence) => {
  const payments = await db.Payment.findAll({
    where: { confirmed: 0 }
  });

  const hashes = payments.map(p => p.hash);

  const block = bitcoin.Block.fromHex(message.toString("hex"), true);
  const hash = await lq.getBlockHash(block.height);
  const json = await lq.getBlock(hash, 2);

  json.tx.map(tx => {
    if (hashes.includes(tx.txid)) queue[tx.txid] = 1;
  });
});

setInterval(async () => {
  let arr = Object.keys(queue);

  for (let i = 0; i < arr.length; i++) {
    let hash = arr[i];

    let p = await db.Payment.findOne({
      include: [{ model: db.User, as: "user" }],
      where: { hash, confirmed: 0, received: 1 }
    })

    p.confirmed = 1;

    let user = await p.getUser();
    user.balance += p.amount + p.tip;
    user.pending -= Math.min(user.pending, p.amount + p.tip);
    l.info("liquid confirmed", user.username, p.amount, p.tip);
    emit(user.username, "user", user);

    await user.save();
    await p.save();

    let payments = await db.Payment.findAll({
      where: { 
        user_id: user.id,
        received: { 
          [Op.ne]: null
        },
      },
      order: [['id', 'DESC']],
      limit: 12
    });

    emit(user.username, "payments", payments);
    delete queue[hash];
  }
}, 1000);