AI Implementation feature(857): Authenticated Shell: Header, Quick Tabs and Change Password (#14)

frontend/src/app/core/services/event-status.pure.ts

@@ -0,0 +1,38 @@
+export type EventState = 'running' | 'countdown' | 'stopped' | 'unconfigured';
+
+export interface EventStatePayload {
+  state: EventState;
+  serverNowUtc: string;
+  eventStartUtc: string | null;
+  eventEndUtc: string | null;
+  secondsToStart: number | null;
+  secondsToEnd: number | null;
+}
+
+export interface EventSourceLike {
+  addEventListener(type: 'open' | 'message' | 'error', listener: (ev: MessageEvent | Event) => void): void;
+  close(): void;
+}
+
+export function formatDdHhMm(totalSeconds: number): string {
+  if (!Number.isFinite(totalSeconds) || totalSeconds < 0) return '00:00:00';
+  const s = Math.floor(totalSeconds);
+  const days = Math.floor(s / 86400);
+  const hours = Math.floor((s % 86400) / 3600);
+  const minutes = Math.floor((s % 3600) / 60);
+  const pad = (n: number) => n.toString().padStart(2, '0');
+  return `${pad(days)}:${pad(hours)}:${pad(minutes)}`;
+}
+
+export function deriveCountdownText(
+  state: EventState,
+  secondsToStart: number | null,
+  secondsToEnd: number | null,
+): string {
+  if (state === 'unconfigured') return '';
+  if (state === 'stopped') return 'Event ended';
+  if (state === 'countdown') {
+    return secondsToStart == null ? '00:00:00' : formatDdHhMm(secondsToStart);
+  }
+  return secondsToEnd == null ? '00:00:00' : formatDdHhMm(secondsToEnd);
+}