Accounting for AC in NTP widget contrib totals

Fixes brave/brave-browser#6740

components/brave_new_tab_ui/rewards-utils.ts

@@ -1,17 +1,31 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
-import { tipsTotal } from '../brave_rewards/resources/page/utils'
 
-export const getTotalContributions = (reports: Record<string, NewTab.RewardsReport>) => {
+import BigNumber from 'bignumber.js'
+
+const getReportIndex = () => {
   const currentTime = new Date()
   const year = currentTime.getFullYear()
   const month = (currentTime.getMonth() + 1)
-  const report: NewTab.RewardsReport = reports[`${year}_${month}`]
 
-  if (!report) {
+  return `${year}_${month}`
+}
+
+export const getTotalContributions = (reports: Record<string, NewTab.RewardsReport>) => {
+  const reportIndex = getReportIndex()
+
+  if (!reports.hasOwnProperty(reportIndex)) {
     return '0.0'
   }
 
-  return tipsTotal(report)
+  const report = reports[reportIndex]
+  const tips = new BigNumber(report.tips)
+  const contribute = new BigNumber(report.contribute)
+
+  return new BigNumber(report.donation)
+    .plus(tips)
+    .plus(contribute)
+    .dividedBy('1e18')
+    .toFixed(1, BigNumber.ROUND_DOWN)
 }