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/*
This file is part of GNU Taler
(C) 2021-2024 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,
TalerMerchantApi,
} from "@gnu-taler/taler-util";
/**
* 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: TalerMerchantApi.RefundDetails[],
cur: TalerMerchantApi.RefundDetails,
): TalerMerchantApi.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;
}
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