65 lines
2.4 KiB
TypeScript
65 lines
2.4 KiB
TypeScript
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/**
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* Derivations for the album header — what a whole album can honestly say about
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* itself. Server-side only by convention, but there is nothing here that needs
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* `fs`, so the unit tests import it directly.
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*/
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import type { ImmichAlbum } from './immich';
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/**
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* Extra detail for the album header — shooting date and camera/lens. Both are
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* rendered in their own spans and hidden by default; only presets that ask for
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* them show them, so the header keeps reading "86 photos" everywhere else.
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*
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* Both used to be read off the first asset that happened to carry EXIF, so an
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* album shot on three bodies advertised whichever one sorted first — and
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* changing the album's sort mode changed the camera it claimed (#509). The
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* header now only states what the whole album agrees on, and spans a date range
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* when the photos do.
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*/
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export function albumMetaDetail(
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album: ImmichAlbum,
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showGear: boolean,
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): { date?: string; gear?: string } {
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const dates = album.assets
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.map((a) => a.exifInfo?.dateTimeOriginal || a.fileCreatedAt)
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.filter((d): d is string => !!d)
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.map((d) => new Date(d).getTime())
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.filter((t) => !Number.isNaN(t))
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.sort((a, b) => a - b);
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const first = dates[0];
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const last = dates[dates.length - 1];
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const from = first !== undefined ? formatMonthYear(new Date(first).toISOString()) : undefined;
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const to = last !== undefined ? formatMonthYear(new Date(last).toISOString()) : undefined;
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const date = from && to ? (from === to ? from : `${from} – ${to}`) : from || to;
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return {
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...(date ? { date } : {}),
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...(showGear ? withGear(album) : {}),
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};
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}
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/**
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* The camera and lens, but only when every photo that names one names the same
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* one. A mixed album says nothing rather than picking a winner.
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*/
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function withGear(album: ImmichAlbum): { gear?: string } {
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const unique = (values: (string | null | undefined)[]): string | undefined => {
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const set = new Set(values.filter((v): v is string => !!v));
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return set.size === 1 ? [...set][0] : undefined;
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};
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const model = unique(album.assets.map((a) => a.exifInfo?.model));
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const lens = unique(album.assets.map((a) => a.exifInfo?.lensModel));
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const gear = [model, lens].filter(Boolean).join(' · ');
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return gear ? { gear } : {};
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}
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function formatMonthYear(iso: string): string | undefined {
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const d = new Date(iso);
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if (Number.isNaN(d.getTime())) return undefined;
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return `${String(d.getMonth() + 1).padStart(2, '0')}/${d.getFullYear()}`;
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}
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