/*!
 * lib/wallet/wallet-info.js
 * Copyright © 2019 – Katana Cryptographic Ltd. All Rights Reserved.
 */
'use strict'

const db = require('../db/mysql-db-wrapper')
const util = require('../util')
const rpcLatestBlock = require('../bitcoind-rpc/latest-block')
const addrService = require('../bitcoin/addresses-service')
const HdAccountInfo = require('./hd-account-info')
const AddressInfo = require('./address-info')


/**
 * A class storing information about a (full|partial) wallet
 * Provides a set of methods allowing to retrieve specific information
 */
class WalletInfo {

  /**
   * Constructor
   * @param {object} entities - wallet entities (hdaccounts, addresses, pubkeys)
   */
  constructor(entities) {
    // Initializes wallet properties
    this.entities = entities

    this.wallet = {
      finalBalance: 0
    }

    this.info = {
      latestBlock: {
        height: rpcLatestBlock.height,
        hash: rpcLatestBlock.hash,
        time: rpcLatestBlock.time,
      }
    }

    this.addresses = []
    this.txs = []
    this.unspentOutputs = []
    this.nTx = 0
  }


  /**
   * Ensure hd accounts exist in database
   * @returns {Promise} 
   */
  async ensureHdAccounts() {
    return util.seriesCall(this.entities.xpubs, async xpub => {
      const hdaInfo = new HdAccountInfo(xpub)
      return hdaInfo.ensureHdAccount()
    })
  }

  /**
   * Load information about the hd accounts
   * @returns {Promise}
   */
  async loadHdAccountsInfo() {
    return util.seriesCall(this.entities.xpubs, async xpub => {
      const hdaInfo = new HdAccountInfo(xpub)
      await hdaInfo.loadInfo()
      this.wallet.finalBalance += hdaInfo.finalBalance
      this.addresses.push(hdaInfo)
    })
  }

  /**
   * Ensure addresses exist in database
   * @returns {Promise}
   */
  async ensureAddresses() {
    const importAddrs = []
    
    const addrIdMap = await db.getAddressesIds(this.entities.addrs)

    for (let addr of this.entities.addrs) {
      if (!addrIdMap[addr])
        importAddrs.push(addr)
    }

    // Import new addresses
    return addrService.restoreAddresses(importAddrs, true)
  }

  /**
   * Filter addresses that belong to an active hd account
   * @returns {Promise}
   */
  async filterAddresses() {
    const res = await db.getXpubByAddresses(this.entities.addrs)

    for (let addr in res) {
      let xpub = res[addr]
      if (this.entities.xpubs.indexOf(xpub) > -1) {
        let i = this.entities.addrs.indexOf(addr)
        if (i > -1) {
          this.entities.addrs.splice(i, 1)
          this.entities.pubkeys.splice(i, 1)
        }
      }
    }
  }

  /**
   * Load information about the addresses
   * @returns {Promise}
   */
  async loadAddressesInfo() {
    return util.seriesCall(this.entities.addrs, async address => {
      const addrInfo = new AddressInfo(address)
      await addrInfo.loadInfo()
      this.wallet.finalBalance += addrInfo.finalBalance
      this.addresses.push(addrInfo)
    })
  }

  /**
   * Loads a partial list of transactions for this wallet
   * @param {integer} page - page index
   * @param {integer} count - number of transactions per page
   * @param {boolean} txBalance - True if past wallet balance 
   *    should be computed for each transaction
   * @returns {Promise}
   */
  async loadTransactions(page, count, txBalance) {
    this.txs = await db.getTxsByAddrAndXpubs(
      this.entities.addrs,
      this.entities.xpubs,
      page,
      count
    )

    if (txBalance) {
      // Computes wallet balance after each transaction
      let balance = this.wallet.finalBalance
      for (let i = 0; i < this.txs.length; i++) {
        this.txs[i].balance = balance
        balance -= this.txs[i].result
      }
    }
  }

  /**
   * Loads the number of transactions for this wallet
   * @returns {Promise}
   */
  async loadNbTransactions() {
    const nbTxs = await db.getAddrAndXpubsNbTransactions(
      this.entities.addrs,
      this.entities.xpubs
    )

    if (nbTxs !== null)
      this.nTx = nbTxs
  }

  /**
   * Loads the list of unspent outputs for this wallet
   * @returns {Promise}
   */
  async loadUtxos() {
    // Load the utxos for the hd accounts
    await util.seriesCall(this.entities.xpubs, async xpub => {
      const hdaInfo = new HdAccountInfo(xpub)
      const utxos = await hdaInfo.loadUtxos()
      for (let utxo of utxos)
        this.unspentOutputs.push(utxo)
    })

    // Load the utxos for the addresses
    const utxos = await db.getUnspentOutputs(this.entities.addrs)

    for (let utxo of utxos) {
      const conf =
        (utxo.blockHeight == null)
        ? 0
        : (rpcLatestBlock.height - utxo.blockHeight + 1)

      const entry = {
        tx_hash: utxo.txnTxid,
        tx_output_n: utxo.outIndex,
        tx_version: utxo.txnVersion,
        tx_locktime: utxo.txnLocktime,
        value: utxo.outAmount,
        script: utxo.outScript,
        addr: utxo.addrAddress,
        confirmations: conf
      }

      this.unspentOutputs.push(entry)
    }

    // Order the utxos
    this.unspentOutputs.sort((a,b) => b.confirmations - a.confirmations)
  }

  /**
   * Post process addresses and public keys
   */
  postProcessAddresses() {
    for (let b = 0; b < this.entities.pubkeys.length; b++) {
      const pk = this.entities.pubkeys[b]

      if (pk) {
        const address = this.entities.addrs[b]

        // Add pubkeys in this.addresses
        for (let c = 0; c < this.addresses.length; c++) {
          if (address == this.addresses[c].address)
            this.addresses[c].pubkey = pk
        }

        // Add pubkeys in this.txs
        for (let d = 0; d < this.txs.length; d++) {
          // inputs
          for (let e = 0; e < this.txs[d].inputs.length; e++) {
            if (address == this.txs[d].inputs[e].prev_out.addr)
              this.txs[d].inputs[e].prev_out.pubkey = pk
          }
          // outputs
          for (let e = 0; e < this.txs[d].out.length; e++) {
            if (address == this.txs[d].out[e].addr)
              this.txs[d].out[e].pubkey = pk
          }
        }

        // Add pubkeys in this.unspentOutputs
        for (let f = 0; f < this.unspentOutputs.length; f++) {
          if (address == this.unspentOutputs[f].addr) {
            this.unspentOutputs[f].pubkey = pk
          }
        }
      }
    }
  }

  /**
   * Post process hd accounts (xpubs translations)
   */
  postProcessHdAccounts() {
    for (let b = 0; b < this.entities.xpubs.length; b++) {
      const entityXPub = this.entities.xpubs[b]
      const entityYPub = this.entities.ypubs[b]
      const entityZPub = this.entities.zpubs[b]

      if (entityYPub || entityZPub) {
        const tgtXPub = entityYPub ? entityYPub : entityZPub

        // Translate xpub => ypub/zpub in this.addresses
        for (let c = 0; c < this.addresses.length; c++) {
          if (entityXPub == this.addresses[c].address)
            this.addresses[c].address = tgtXPub
        }

        // Translate xpub => ypub/zpub in this.txs
        for (let d = 0; d < this.txs.length; d++) {
          // inputs
          for (let e = 0; e < this.txs[d].inputs.length; e++) {
            const xpub = this.txs[d].inputs[e].prev_out.xpub
            if (xpub && (xpub.m == entityXPub))
              this.txs[d].inputs[e].prev_out.xpub.m = tgtXPub
          }

          // outputs
          for (let e = 0; e < this.txs[d].out.length; e++) {
            const xpub = this.txs[d].out[e].xpub
            if (xpub && (xpub.m == entityXPub))
              this.txs[d].out[e].xpub.m = tgtXPub
          }
        }

        // Translate xpub => ypub/zpub in this.unspentOutputs
        for (let f = 0; f < this.unspentOutputs.length; f++) {
          const xpub = this.unspentOutputs[f].xpub
          if (xpub && (xpub.m == entityXPub)) {
            this.unspentOutputs[f].xpub.m = tgtXPub
          }
        }
      }
    }
  }

  /**
   * Return a plain old js object with wallet properties
   * @returns {object}
   */
  toPojo() {
    return {
      wallet: {
        final_balance: this.wallet.finalBalance
      },
      info: {
        latest_block: this.info.latestBlock
      },
      addresses: this.addresses.map(a => a.toPojo()),
      txs: this.txs,
      unspent_outputs: this.unspentOutputs,
      n_tx: this.nTx
    }
  }

}

module.exports = WalletInfo