Fetch time till hardLimit clears (#265)

* Fetch time till hardLimit clears

* Default to zero in case of negative numbers

lib/customers.js

@@ -6,6 +6,8 @@ const makeDir = require('make-dir')
 const path = require('path')
 const fs = require('fs')
 const util = require('util')
+const moment = require('moment')
+
 
 const db = require('./db')
 const BN = require('./bn')
@@ -115,17 +117,32 @@ function getById (id, userToken) {
  */
 function getDailyVolume (id) {
   return Promise.all([
-    db.one(`select coalesce(sum(fiat), 0) as total from cash_in_txs
+    db.one(`select coalesce(sum(fiat), 0) as total, max(created) as maxdate from cash_in_txs
            where customer_id=$1
            and created > now() - interval '1 day'`, [id]),
-    db.one(`select coalesce(sum(fiat), 0) as total from cash_out_txs
+    db.one(`select coalesce(sum(fiat), 0) as total, max(created) as maxdate from cash_out_txs
            where customer_id=$1
            and created > now() - interval '1 day'`, [id])
-  ]).then(([cashInTotal, cashOutTotal]) => {
-    return BN(cashInTotal.total).add(cashOutTotal.total)
+  ]).then(([cashIn, cashOut]) => {
+    const dailyVolume = BN(cashIn.total).add(cashOut.total)
+    const hoursTillLimitClear = getHoursTillLimitClear(cashIn.maxdate, cashOut.maxdate)
+    return { dailyVolume, hoursTillLimitClear }
   })
 }
 
+function getHoursTillLimitClear (cashInDate, cashOutDate) {
+  let startDate = moment()
+  startDate = startDate.subtract(1, 'days')
+
+  const cashInMoment = moment(cashInDate || startDate)
+  const cashOutMoment = moment(cashOutDate || startDate)
+
+  const cashInDuration = moment.duration(cashInMoment.diff(startDate)).asHours()
+  const cashOutDuration = moment.duration(cashOutMoment.diff(startDate)).asHours()
+
+  return _.ceil(_.max([cashInDuration, cashOutDuration, 0]))
+}
+
 /**
  * Camelize customer fields
  * Note: return null if customer is undefined
@@ -152,8 +169,9 @@ function camelize (customer) {
  */
 function populateDailyVolume (customer) {
   if (!customer) return
-  return getDailyVolume(customer.id).then(dailyVolume => {
-    return _.set('daily_volume', dailyVolume, customer)
+  return getDailyVolume(customer.id).then(({ dailyVolume, hoursTillLimitClear }) => {
+    let withHours = _.set('hours_till_limit_clear', hoursTillLimitClear, customer)
+    return _.set('daily_volume', dailyVolume, withHours)
   })
 }