40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
import type { Money } from '#src/common/money.types';
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import { DECIMAL_RADIX, decimalFromString, formatDecimal } from '#src/common/decimal';
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export const ZERO_KOPECKS = 0n;
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const RUB_DECIMAL_PLACES = 2;
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const MIN_KOPECKS = -9_223_372_036_854_775_808n;
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const MAX_KOPECKS = 9_223_372_036_854_775_807n;
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export function parseRubMoney(money: Money, positive = false): bigint {
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if (
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money?.currency !== 'RUB' ||
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typeof money.value !== 'string' ||
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money.value !== money.value.trim()
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) {
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throw new TypeError('Expected RUB money with a decimal string');
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}
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const amount = decimalFromString(money.value);
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if (amount.scale > RUB_DECIMAL_PLACES) {
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throw new RangeError('RUB money supports at most two decimal places');
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}
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const kopecks = amount.value * DECIMAL_RADIX ** BigInt(RUB_DECIMAL_PLACES - amount.scale);
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if (kopecks < MIN_KOPECKS || kopecks > MAX_KOPECKS) {
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throw new RangeError('RUB money is outside the signed 64-bit range');
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}
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if (positive && kopecks <= ZERO_KOPECKS) {
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throw new RangeError('Operation amount must be positive');
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}
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return kopecks;
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}
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export function rubMoney(kopecks: bigint): Money {
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return {
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currency: 'RUB',
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value: formatDecimal({ value: kopecks, scale: RUB_DECIMAL_PLACES }),
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};
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}
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