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* useLiveSessionControl Hook
*
* Real-time session control for live events via REST polling (Story 15.1).
* Mirrors the Watch app's session control functionality (W4.3) for the web.
*
* - Polls GET /events/{eventCode}/live-timing adaptively (3–5 s while a session is
* active, backing off when idle or the tab is hidden), sending If-None-Match so an
* unchanged snapshot costs a 304.
* - Exposes extend/delay actions identical to the Watch app (EXTEND_SESSION,
* DELAY_TO_PREVIOUS) via POST .../live-timing/actions.
* - Button visibility logic mirrors Watch: extend while active, delay in first 10 min.
*
* Auth: Cognito organizer JWT (apiClient adds it). The authenticated poll also refreshes
* server-side organizer presence. Replaces the previous STOMP/WebSocket implementation —
* no per-task in-memory state, so polls landing on different Fargate tasks are consistent.
*/
import { useState, useEffect, useRef, useCallback } from 'react';
import { liveTimingService } from '@/services/liveTimingService';
import type { components } from '@/types/generated/event-watch-api.types';
type WatchSessionDetail = components['schemas']['WatchSessionDetail'];
type LiveTimingActionRequest = components['schemas']['LiveTimingActionRequest'];
export type ConnectionStatus = 'connecting' | 'connected' | 'reconnecting' | 'offline';
/** Adaptive poll cadence (ms). */
const POLL_INTERVAL_ACTIVE = 4000;
const POLL_INTERVAL_IDLE = 15000;
const POLL_INTERVAL_HIDDEN = 30000;
export interface LiveSessionControlState {
sessions: WatchSessionDetail[];
activeSession: WatchSessionDetail | null;
nextSession: WatchSessionDetail | null;
remainingSeconds: number;
elapsedSeconds: number;
shouldShowExtend: boolean;
shouldShowDelay: boolean;
connectionStatus: ConnectionStatus;
sendExtend: (minutes: number) => void;
sendDelay: (minutes: number) => void;
isActionInFlight: boolean;
isLoadingInitial: boolean;
}
/**
* Derive session status from scheduled times for the web view.
*
* The Watch app uses an explicit state machine: sessions only become ACTIVE when the
* organizer manually advances them, so the snapshot can carry status:'SCHEDULED' for
* sessions that are live by the clock. The web live-control page uses a schedule-based
* view instead:
* - COMPLETED is respected from the server (explicit organizer end / actualEndTime)
* - ACTIVE / SCHEDULED are derived from the current time vs scheduled times so the page
* reflects what is happening right now regardless of watch state.
*/
function deriveStatus(
session: WatchSessionDetail,
now: number
): 'SCHEDULED' | 'ACTIVE' | 'COMPLETED' {
if (session.actualEndTime || session.status === 'COMPLETED') return 'COMPLETED';
const start = session.scheduledStartTime ? new Date(session.scheduledStartTime).getTime() : null;
const end = session.scheduledEndTime ? new Date(session.scheduledEndTime).getTime() : null;
if (start !== null && end !== null) {
if (now >= start && now < end) return 'ACTIVE';
Iif (now >= end) return 'COMPLETED';
}
return 'SCHEDULED';
}
function enrichSessions(sessions: WatchSessionDetail[], now: number): WatchSessionDetail[] {
return sessions.map((s) => ({ ...s, status: deriveStatus(s, now) }));
}
function sortSessions(sessions: WatchSessionDetail[]): WatchSessionDetail[] {
return [...sessions].sort((a, b) =>
(a.scheduledStartTime ?? '').localeCompare(b.scheduledStartTime ?? '')
);
}
export function useLiveSessionControl(eventCode: string | undefined): LiveSessionControlState {
const [sessions, setSessions] = useState<WatchSessionDetail[]>([]);
const [connectionStatus, setConnectionStatus] = useState<ConnectionStatus>('connecting');
const [isActionInFlight, setIsActionInFlight] = useState(false);
const [isLoadingInitial, setIsLoadingInitial] = useState(true);
const [currentTime, setCurrentTime] = useState(Date.now());
const etagRef = useRef<string | null>(null);
// Latest sessions, readable inside the polling loop without re-subscribing.
const sessionsRef = useRef<WatchSessionDetail[]>([]);
// Action queued while a POST failed (offline) — retried on the next successful poll.
const pendingActionRef = useRef<LiveTimingActionRequest | null>(null);
// Latest dispatch function, so the polling loop can flush a queued action.
const dispatchActionRef = useRef<
((payload: LiveTimingActionRequest) => Promise<void>) | undefined
>(undefined);
const applySnapshot = useCallback(
(next: WatchSessionDetail[] | undefined, etag: string | null) => {
etagRef.current = etag;
const sorted = sortSessions((next ?? []).filter((s) => s.scheduledStartTime != null));
sessionsRef.current = sorted;
setSessions(sorted);
},
[]
);
// 1-second ticker to drive countdown and re-derive statuses.
useEffect(() => {
const id = setInterval(() => setCurrentTime(Date.now()), 1000);
return () => clearInterval(id);
}, []);
// Dispatch a timing action over REST; queue + flag reconnecting if it fails.
const dispatchAction = useCallback(
async (payload: LiveTimingActionRequest) => {
Iif (!eventCode) return;
try {
const result = await liveTimingService.postLiveTimingAction(eventCode, payload);
applySnapshot(result.data.sessions, result.etag);
setConnectionStatus('connected');
setIsActionInFlight(false);
} catch {
// Offline / transient — queue for the next successful poll to retry.
pendingActionRef.current = payload;
setConnectionStatus('reconnecting');
}
},
[eventCode, applySnapshot]
);
dispatchActionRef.current = dispatchAction;
// Adaptive REST polling loop (replaces the STOMP subscription).
useEffect(() => {
if (!eventCode) return;
let cancelled = false;
let timeoutId: ReturnType<typeof setTimeout> | null = null;
const computeInterval = (): number => {
Iif (typeof document !== 'undefined' && document.hidden) return POLL_INTERVAL_HIDDEN;
const now = Date.now();
const hasActive = sessionsRef.current.some((s) => deriveStatus(s, now) === 'ACTIVE');
return hasActive ? POLL_INTERVAL_ACTIVE : POLL_INTERVAL_IDLE;
};
const poll = async () => {
Iif (cancelled) return;
try {
const result = await liveTimingService.getLiveTiming(eventCode, etagRef.current);
Iif (cancelled) return;
if (result.status === 200 && result.data) {
applySnapshot(result.data.sessions, result.etag);
} else E{
// 304 — unchanged; keep the etag for the next conditional poll.
etagRef.current = result.etag;
}
setConnectionStatus('connected');
// Flush a queued action now that connectivity is back.
Iif (pendingActionRef.current) {
const queued = pendingActionRef.current;
pendingActionRef.current = null;
await dispatchActionRef.current?.(queued);
}
} catch {
Eif (!cancelled) setConnectionStatus('reconnecting');
} finally {
Eif (!cancelled) {
setIsLoadingInitial(false);
timeoutId = setTimeout(poll, computeInterval());
}
}
};
void poll();
return () => {
cancelled = true;
Eif (timeoutId) clearTimeout(timeoutId);
};
}, [eventCode, applySnapshot]);
// Derived timing state — recomputed every second via currentTime.
const enriched = enrichSessions(sessions, currentTime);
const activeSession = enriched.find((s) => s.status === 'ACTIVE') ?? null;
const nextSession =
enriched.find((s) => s.status === 'SCHEDULED' && s.scheduledStartTime != null) ?? null;
let remainingSeconds = 0;
let elapsedSeconds = 0;
if (activeSession) {
Eif (activeSession.scheduledEndTime) {
remainingSeconds = Math.max(
0,
Math.floor((new Date(activeSession.scheduledEndTime).getTime() - currentTime) / 1000)
);
}
const effectiveStart = activeSession.actualStartTime ?? activeSession.scheduledStartTime;
Eif (effectiveStart) {
elapsedSeconds = Math.max(
0,
Math.floor((currentTime - new Date(effectiveStart).getTime()) / 1000)
);
}
}
// Extend/reduce button: always visible when a session is active.
const shouldShowExtend = activeSession !== null;
// Delay button: first 10 minutes of session (mirrors Watch W4.3).
const shouldShowDelay = activeSession !== null && elapsedSeconds < 600;
const sendExtend = useCallback(
(minutes: number) => {
if (!activeSession) return;
// No isActionInFlight for extend/reduce — user can adjust repeatedly.
void dispatchAction({
type: 'EXTEND_SESSION',
sessionSlug: activeSession.sessionSlug,
minutes,
});
},
[activeSession, dispatchAction]
);
const sendDelay = useCallback(
(minutes: number) => {
if (!activeSession) return;
setIsActionInFlight(true);
// Safety reset: re-enable if the action does not resolve within 5 s.
setTimeout(() => setIsActionInFlight(false), 5000);
void dispatchAction({
type: 'DELAY_TO_PREVIOUS',
sessionSlug: activeSession.sessionSlug,
minutes,
});
},
[activeSession, dispatchAction]
);
return {
sessions: enriched,
activeSession,
nextSession,
remainingSeconds,
elapsedSeconds,
shouldShowExtend,
shouldShowDelay,
connectionStatus,
sendExtend,
sendDelay,
isActionInFlight,
isLoadingInitial,
};
}
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