1 files changed, 71 insertions, 0 deletions
diff --git a/packages/auditor-backoffice-ui/src/utils/amount.ts b/packages/auditor-backoffice-ui/src/utils/amount.ts
new file mode 100644
index 000000000..475489d3e
--- /dev/null
+++ b/packages/auditor-backoffice-ui/src/utils/amount.ts
@@ -0,0 +1,71 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021-2023 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+import {
+  amountFractionalBase,
+  AmountJson,
+  Amounts,
+} from "@gnu-taler/taler-util";
+import { MerchantBackend } from "../declaration.js";
+
+/**
+ * merge refund with the same description and a difference less than one minute
+ * @param prev list of refunds that will hold the merged refunds
+ * @param cur new refund to add to the list
+ * @returns list with the new refund, may be merged with the last
+ */
+export function mergeRefunds(
+  prev: MerchantBackend.Orders.RefundDetails[],
+  cur: MerchantBackend.Orders.RefundDetails,
+): MerchantBackend.Orders.RefundDetails[] {
+  let tail;
+
+  if (
+    prev.length === 0 || //empty list
+    cur.timestamp.t_s === "never" || //current does not have timestamp
+    (tail = prev[prev.length - 1]).timestamp.t_s === "never" || // last does not have timestamp
+    cur.reason !== tail.reason || //different reason
+    cur.pending !== tail.pending || //different pending state
+    Math.abs(cur.timestamp.t_s - tail.timestamp.t_s) > 1000 * 60
+  ) {
+    //more than 1 minute difference
+
+    //can't merge refunds, they are different or to distant in time
+    prev.push(cur);
+    return prev;
+  }
+
+  const a = Amounts.parseOrThrow(tail.amount);
+  const b = Amounts.parseOrThrow(cur.amount);
+  const r = Amounts.add(a, b).amount;
+
+  prev[prev.length - 1] = {
+    ...tail,
+    amount: Amounts.stringify(r),
+  };
+
+  return prev;
+}
+
+export function rate(a: AmountJson, b: AmountJson): number {
+  const af = toFloat(a);
+  const bf = toFloat(b);
+  if (bf === 0) return 0;
+  return af / bf;
+}
+
+function toFloat(amount: AmountJson): number {
+  return amount.value + amount.fraction / amountFractionalBase;
+}