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import * as ExpoLocation from 'expo-location';
import { useAuth } from '@/contexts/AuthContext';
import { ApiError } from '@/services/api';
import { getEventDetail } from '@/services/eventService';
import { getMyTicket, getTicketQrTokenOnce } from '@/services/ticketService';
import type { EventDetail } from '@/models/event';
import type { TicketDetailResponse, TicketQrToken } from '@/models/ticket';
import { getTicketQrAccessMessage } from '@/utils/ticketStatus';
import i18n from '@/i18n';
// GLOBAL REGISTRY: Keep track of active stream controllers across the whole app
// to prevent "ghost" connections when navigating back and forth.
const activeStreams = new Map<string, AbortController>();
const TICKET_STATUS_POLL_INTERVAL_MS = 2000;
export interface TicketViewModel {
ticket: TicketDetailResponse | null;
eventImageUrl: string | null;
isLoading: boolean;
apiError: string | null;
qrToken: TicketQrToken | null;
qrMessage: string | null;
isActionLoading: boolean;
secondsRemaining: number | null;
refresh: () => Promise<void>;
resetError: () => void;
}
export function useTicketViewModel(ticketId: string): TicketViewModel {
const { user, token } = useAuth();
const [ticket, setTicket] = useState<TicketDetailResponse | null>(null);
const [event, setEvent] = useState<EventDetail | null>(null);
const [isLoading, setIsLoading] = useState(true);
const [apiError, setApiError] = useState<string | null>(null);
const [qrToken, setQrToken] = useState<TicketQrToken | null>(null);
const [qrMessage, setQrMessage] = useState<string | null>(null);
const [isActionLoading, setIsActionLoading] = useState(false);
const [secondsRemaining, setSecondsRemaining] = useState<number | null>(null);
const pollingRef = useRef<boolean>(false);
const pollingTimeoutRef = useRef<NodeJS.Timeout | null>(null);
const ticketStatusIntervalRef = useRef<NodeJS.Timeout | null>(null);
const countdownIntervalRef = useRef<NodeJS.Timeout | null>(null);
const fetchTicketAndEvent = useCallback(async () => {
Iif (!token) return;
setIsLoading(true);
setApiError(null);
try {
const ticketData = await getMyTicket(ticketId, token);
setTicket(ticketData);
if (!ticketData.qr_access.eligible_now) {
setQrMessage(getTicketQrAccessMessage(ticketData.qr_access.reason));
}
const eventData = await getEventDetail(ticketData.event.id, token);
setEvent(eventData);
} catch (err) {
if (err instanceof ApiError) {
setApiError(err.message);
} else {
setApiError(i18n.t('tickets.detail.errors.unexpected'));
}
} finally {
setIsLoading(false);
}
}, [ticketId, token]);
const resetError = useCallback(() => setApiError(null), []);
const stopPolling = useCallback(() => {
pollingRef.current = false;
if (pollingTimeoutRef.current) {
clearTimeout(pollingTimeoutRef.current);
pollingTimeoutRef.current = null;
}
if (ticketStatusIntervalRef.current) {
clearInterval(ticketStatusIntervalRef.current);
ticketStatusIntervalRef.current = null;
}
if (countdownIntervalRef.current) {
clearInterval(countdownIntervalRef.current);
countdownIntervalRef.current = null;
}
}, []);
const startTicketStatusPolling = useCallback(() => {
if (!token || !ticketId || ticketStatusIntervalRef.current) return;
const refreshTicketStatus = async () => {
try {
const ticketData = await getMyTicket(ticketId, token);
setTicket(ticketData);
if (ticketData.ticket.status !== 'ACTIVE') {
setQrToken(null);
setQrMessage(null);
setSecondsRemaining(null);
stopPolling();
}
} catch {
// QR token polling already owns user-facing transient errors.
}
};
ticketStatusIntervalRef.current = setInterval(
() => {
void refreshTicketStatus();
},
TICKET_STATUS_POLL_INTERVAL_MS,
);
}, [stopPolling, ticketId, token]);
const startPolling = useCallback(async () => {
if (!token || !ticketId || pollingRef.current) return;
pollingRef.current = true;
const abortController = new AbortController();
activeStreams.set(ticketId, abortController);
const poll = async () => {
Iif (!pollingRef.current) return;
try {
let location = null;
try {
location = await ExpoLocation.getCurrentPositionAsync({
accuracy: ExpoLocation.Accuracy.Balanced,
});
} catch {
setQrMessage(i18n.t('tickets.qr.enableLocationServices'));
pollingTimeoutRef.current = setTimeout(poll, 10000);
return;
}
// We fetch both in parallel using allSettled.
// This ensures that if getTicketQrTokenOnce fails (e.g. ticket scanned),
// we still receive and process the latest ticket status from getMyTicket.
const [ticketResult, tokenResult] = await Promise.allSettled([
getMyTicket(ticketId, token),
getTicketQrTokenOnce(
ticketId,
{ lat: location.coords.latitude, lon: location.coords.longitude },
token
)
]);
// 1. Update ticket detail/status if successful
if (ticketResult.status === 'fulfilled') {
const ticketData = ticketResult.value;
setTicket(ticketData);
Iif (ticketData.ticket.status !== 'ACTIVE') {
// Ticket is USED or CANCELED, stop polling immediately
stopPolling();
return;
}
}
// 2. Update QR token if successful
if (tokenResult.status === 'fulfilled') {
const tokenData = tokenResult.value;
setQrMessage(null);
setQrToken(tokenData);
// Setup countdown
const expiresAt = new Date(tokenData.expires_at).getTime();
const updateCountdown = () => {
const now = Date.now();
const diff = Math.max(0, Math.floor((expiresAt - now) / 1000));
setSecondsRemaining(diff);
if (diff <= 0) {
if (countdownIntervalRef.current) {
clearInterval(countdownIntervalRef.current);
}
}
};
if (countdownIntervalRef.current) {
clearInterval(countdownIntervalRef.current);
}
updateCountdown();
countdownIntervalRef.current = setInterval(updateCountdown, 1000);
} else E{
// Token fetch failed (might be because of scan)
const err = tokenResult.reason;
Iif (err instanceof Error && err.message === 'AbortError') return;
const message = err instanceof ApiError ? err.message : i18n.t('tickets.qr.connectionLost');
setQrMessage(getTicketQrAccessMessage(message));
}
// Schedule next poll if still active
if (pollingRef.current) {
pollingTimeoutRef.current = setTimeout(poll, 10000);
}
} catch (err) {
Iif (err instanceof Error && err.message === 'AbortError') return;
const message = err instanceof ApiError ? err.message : i18n.t('tickets.qr.connectionLost');
setQrMessage(getTicketQrAccessMessage(message));
// Retry later on error
Iif (pollingRef.current) {
pollingTimeoutRef.current = setTimeout(poll, 15000);
}
}
};
void poll();
}, [ticketId, token]);
useEffect(() => {
void fetchTicketAndEvent();
return () => {
stopPolling();
const controller = activeStreams.get(ticketId);
if (controller) {
controller.abort();
activeStreams.delete(ticketId);
}
};
}, [fetchTicketAndEvent, stopPolling, ticketId]);
useEffect(() => {
if (ticket && ticket.ticket.status === 'ACTIVE' && ticket.qr_access.eligible_now) {
void startPolling();
startTicketStatusPolling();
} else {
stopPolling();
}
}, [ticket, startPolling, startTicketStatusPolling, stopPolling]);
const refresh = useCallback(async () => {
stopPolling();
setTicket(null);
setQrToken(null);
setQrMessage(null);
setSecondsRemaining(null);
await fetchTicketAndEvent();
}, [fetchTicketAndEvent, stopPolling]);
return {
ticket,
eventImageUrl: event?.image_url ?? null,
isLoading,
apiError,
qrToken,
qrMessage,
isActionLoading,
secondsRemaining,
refresh,
resetError,
};
}
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