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52 lines
1.8 KiB
TypeScript
52 lines
1.8 KiB
TypeScript
/**
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* Shared locale-aware time helpers for sidebar / session lists.
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*
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* Two pieces:
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*
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* 1. `getDayGroupKey(ts)` — returns a stable token (`today` / `yesterday` /
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* `last_7_days` / `earlier`) for grouping. Callers map that token to a
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* translated label via i18next so the same grouping logic works across
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* locales.
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*
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* 2. `formatRelativeTime(ts, locale)` — wraps `Intl.RelativeTimeFormat` with
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* the caller's active locale instead of the previously-hardcoded `"en"`.
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* Falls back to `"en"` on unsupported locales to match Intl's own
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* behaviour rather than throwing.
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*/
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export type DayGroupKey = "today" | "yesterday" | "last_7_days" | "earlier";
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export function getDayGroupKey(timestamp: number): DayGroupKey {
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const now = new Date();
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const date = new Date(timestamp * 1000);
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const startOfToday = new Date(
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now.getFullYear(),
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now.getMonth(),
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now.getDate(),
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).getTime();
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const startOfItemDay = new Date(
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date.getFullYear(),
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date.getMonth(),
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date.getDate(),
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).getTime();
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const diffDays = Math.floor((startOfToday - startOfItemDay) / 86400000);
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if (diffDays <= 0) return "today";
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if (diffDays === 1) return "yesterday";
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if (diffDays < 7) return "last_7_days";
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return "earlier";
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}
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export function formatRelativeTime(timestamp: number, locale: string): string {
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const diffSeconds = Math.round(timestamp - Date.now() / 1000);
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const formatter = new Intl.RelativeTimeFormat(locale || "en", {
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numeric: "auto",
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});
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const abs = Math.abs(diffSeconds);
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if (abs < 60) return formatter.format(diffSeconds, "second");
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if (abs < 3600)
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return formatter.format(Math.round(diffSeconds / 60), "minute");
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if (abs < 86400)
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return formatter.format(Math.round(diffSeconds / 3600), "hour");
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return formatter.format(Math.round(diffSeconds / 86400), "day");
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}
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