const _ = require('lodash/fp')
const pgp = require('pg-promise')()
const uuid = require('uuid')

const BN = require('./bn')
const db = require('./db')

function addTransactionToBatch (tx) {
  const sql = `SELECT * FROM transaction_batches WHERE crypto_code=$1 AND status='open' ORDER BY created_at DESC LIMIT 1`
  const sql2 = `UPDATE cash_in_txs SET batch_id=$1 WHERE id=$2`

  return db.oneOrNone(sql, [tx.cryptoCode])
    .then(batch => {
      if (_.isNil(batch)) {
        return db.tx(t => {
          const newBatchId = uuid.v4()
          const q1 = t.none(`INSERT INTO transaction_batches (id, crypto_code) VALUES ($1, $2)`, [newBatchId, tx.cryptoCode])
          const q2 = t.none(sql2, [newBatchId, tx.id])

          return t.batch([q1, q2])
        })
      }
      return db.none(sql2, [batch.id, tx.id])
    })
}

function closeTransactionBatch (batch) {
  const sql = `UPDATE transaction_batches SET status='ready', closed_at=now() WHERE id=$1`

  return db.none(sql, [batch.id])
}

function confirmSentBatch (batch, tx) {
  return db.tx(t => {
    const q1 = t.none(`UPDATE transaction_batches SET status='sent', error_message=NULL WHERE id=$1`, [batch.id])
    const q2 = t.none(`UPDATE cash_in_txs SET tx_hash=$1, fee=$2, send=true, send_confirmed=true, send_time=now(), send_pending=false, error=NULL, error_code=NULL WHERE batch_id=$3`, [tx.txid, tx.fee.toString(), batch.id])

    return t.batch([q1, q2])
  })
}

function setErroredBatch (batch, errorMsg) {
  const sql = `UPDATE transaction_batches SET status='failed', error_message=$1 WHERE id=$2`

  return db.none(sql, [errorMsg, batch.id])
}

function getBatchTransactions (batch) {
  const sql = `SELECT * FROM cash_in_txs WHERE batch_id=$1`
  return db.manyOrNone(sql, [batch.id])
    .then(res => _.map(_.mapKeys(_.camelCase), res))
}

function getBatchesByStatus (statuses) {
  const sql = `SELECT *, EXTRACT(EPOCH FROM (now() - created_at)) as time_elapsed FROM transaction_batches WHERE status in ($1^)`

  return db.manyOrNone(sql, [_.map(pgp.as.text, statuses).join(',')])
}

function getOpenBatchCryptoValue (cryptoCode) {
  const sql = `SELECT * FROM transaction_batches WHERE crypto_code=$1 AND status='open' ORDER BY created_at DESC LIMIT 1`

  return db.oneOrNone(sql, [cryptoCode])
    .then(batch => {
      if (_.isNil(batch)) return Promise.resolve([])
      return db.any(`SELECT * FROM cash_in_txs WHERE batch_id=$1`, [batch.id])
    })
    .then(txs => _.reduce((acc, tx) => acc.plus(tx.crypto_atoms), BN(0), txs))
}

module.exports = {
  addTransactionToBatch,
  closeTransactionBatch,
  confirmSentBatch,
  setErroredBatch,
  getBatchTransactions,
  getBatchesByStatus,
  getOpenBatchCryptoValue
}