49 lines
1.5 KiB
TypeScript
49 lines
1.5 KiB
TypeScript
import type { AssetResponseDto } from '@immich/sdk';
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import { DateTime } from 'luxon';
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export const yearMonthOf = (asset: AssetResponseDto) => {
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const date = DateTime.fromISO(asset.fileCreatedAt, { zone: 'utc' });
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return `${date.year}-${date.month}`;
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};
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export const yearMonthsOf = (assets: AssetResponseDto[]) => [...new Set(assets.map((asset) => yearMonthOf(asset)))];
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export const adjacentYearMonths = (yearMonth: string) => {
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const [year, month] = yearMonth.split('-', 2).map(Number);
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return [-1, 0, 1].map((offset) => {
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const date = DateTime.utc(year, month).plus({ months: offset });
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return `${date.year}-${date.month}`;
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});
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};
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const samePeriod = (a: DateTime, b: DateTime, unit: 'day' | 'month' | 'year') => {
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switch (unit) {
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case 'day': {
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return a.hasSame(b, 'day');
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}
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case 'month': {
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return a.hasSame(b, 'month');
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}
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default: {
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return a.hasSame(b, 'year');
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}
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}
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};
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export const adjacentAsset = (
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assets: AssetResponseDto[],
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asset: AssetResponseDto,
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direction: 'next' | 'previous',
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unit: 'day' | 'month' | 'year',
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) => {
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const current = DateTime.fromISO(asset.fileCreatedAt, { zone: 'utc' });
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const index = assets.findIndex(({ id }) => id === asset.id);
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const step = direction === 'next' ? 1 : -1;
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for (let cursor = index + step; cursor >= 0 && cursor < assets.length; cursor += step) {
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const candidate = assets[cursor];
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if (!samePeriod(DateTime.fromISO(candidate.fileCreatedAt, { zone: 'utc' }), current, unit)) {
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return candidate;
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}
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}
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};
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