Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license

apps/desktop/src/components/assistant-ui/thread/timestamp.ts

@@ -0,0 +1,68 @@
+import { fmtClock, fmtDayTime } from '@/lib/time'
+
+const fmtTimelineClock = new Intl.DateTimeFormat(undefined, {
+  fractionalSecondDigits: 3,
+  hour: 'numeric',
+  minute: '2-digit',
+  second: '2-digit'
+})
+
+const timelineDate = (seconds: number | undefined): Date | null => {
+  if (typeof seconds !== 'number' || !Number.isFinite(seconds) || seconds <= 0) {
+    return null
+  }
+
+  const date = new Date(seconds * 1000)
+
+  return Number.isNaN(date.getTime()) ? null : date
+}
+
+/** Millisecond-precise local clock for transcript activity boundaries. */
+export function formatTimelineTimestamp(seconds: number | undefined): string {
+  const date = timelineDate(seconds)
+
+  return date ? fmtTimelineClock.format(date) : ''
+}
+
+export function formatTimelineRange(start: number | undefined, end: number | undefined): string {
+  const from = formatTimelineTimestamp(start)
+
+  if (!from) {
+    return ''
+  }
+
+  const to = formatTimelineTimestamp(end)
+
+  return to ? `${from} → ${to}` : from
+}
+
+function startOfDay(d: Date): number {
+  return new Date(d.getFullYear(), d.getMonth(), d.getDate()).getTime()
+}
+
+export function formatMessageTimestamp(
+  value: Date | string | number | undefined,
+  labels: { today: (time: string) => string; yesterday: (time: string) => string }
+): string {
+  if (!value) {
+    return ''
+  }
+
+  const date = value instanceof Date ? value : new Date(value)
+
+  if (Number.isNaN(date.getTime())) {
+    return ''
+  }
+
+  const dayDelta = Math.round((startOfDay(new Date()) - startOfDay(date)) / 86_400_000)
+
+  if (dayDelta === 0) {
+    return labels.today(fmtClock.format(date))
+  }
+
+  if (dayDelta === 1) {
+    return labels.yesterday(fmtClock.format(date))
+  }
+
+  return fmtDayTime.format(date)
+}