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import { AppState, AppStateStatus } from 'react-native';
import { getAuth, getIdToken } from '@react-native-firebase/auth';
import { FLASH_WS_URL } from '@/constants/apis';
type WSStatus = 'idle' | 'connecting' | 'connected' | 'reconnecting' | 'closed';
const MAX_RECONNECT_DELAY = 30_000;
export const useWebSocketListener = () => {
const wsRef = useRef<WebSocket | null>(null);
const reconnectTimerRef = useRef<NodeJS.Timeout | null>(null);
const reconnectAttemptRef = useRef(0);
const shouldReconnectRef = useRef(true);
const appStateRef = useRef<AppStateStatus>('active');
const connectRef = useRef<() => Promise<void>>(async () => {});
const [status, setStatus] = useState<WSStatus>('idle');
const [lastMessage, setLastMessage] = useState<any>(null);
const clearReconnectTimer = () => {
Iif (reconnectTimerRef.current) {
clearTimeout(reconnectTimerRef.current);
reconnectTimerRef.current = null;
}
};
const scheduleReconnect = useCallback(() => {
if (!shouldReconnectRef.current) return;
if (appStateRef.current !== 'active') return;
reconnectAttemptRef.current += 1;
const delay = Math.min(1000 * Math.pow(2, reconnectAttemptRef.current), MAX_RECONNECT_DELAY);
setStatus('reconnecting');
reconnectTimerRef.current = setTimeout(() => {
connectRef.current();
}, delay);
}, []);
const disconnect = useCallback(() => {
shouldReconnectRef.current = false;
clearReconnectTimer();
if (wsRef.current) {
wsRef.current.close();
wsRef.current = null;
}
setStatus('closed');
}, []);
connectRef.current = async () => {
try {
const auth = getAuth();
const user = auth.currentUser;
Iif (!user) {
console.warn('[WS] No Firebase user, skip connect');
return;
}
setStatus(prev => (prev === 'connected' ? prev : 'connecting'));
const token = await getIdToken(user);
Iif (!shouldReconnectRef.current) return;
const ws = new WebSocket(`${FLASH_WS_URL}?token=${encodeURIComponent(token)}`);
wsRef.current = ws;
ws.onopen = () => {
reconnectAttemptRef.current = 0;
setStatus('connected');
};
ws.onmessage = event => {
try {
const data = JSON.parse(event.data);
setLastMessage(data);
} catch {
console.warn('[WS] Non-JSON message:', event.data);
}
};
ws.onerror = e => {
console.warn('[WS] Error', e);
};
ws.onclose = () => {
wsRef.current = null;
setStatus('closed');
scheduleReconnect();
};
} catch (err) {
console.error('[WS] Connect error', err);
scheduleReconnect();
}
};
useEffect(() => {
const sub = AppState.addEventListener('change', nextState => {
appStateRef.current = nextState;
Iif (nextState === 'active') {
if (!wsRef.current && shouldReconnectRef.current) {
connectRef.current();
}
}
Eif (nextState === 'background') {
wsRef.current?.close();
}
});
return () => sub.remove();
}, []);
useEffect(() => {
shouldReconnectRef.current = true;
connectRef.current();
return () => {
disconnect();
};
}, [disconnect]);
return {
status,
connected: status === 'connected',
lastMessage,
send: (data: any) => {
if (wsRef.current?.readyState === WebSocket.OPEN) {
wsRef.current.send(JSON.stringify(data));
}
},
disconnect,
};
};
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