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import { useEffect } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { connect } from 'react-redux';
import { positionsActions, devicesActions, sessionActions } from './store';
import { useHistory } from 'react-router-dom';
const displayNotifications = events => {
if ("Notification" in window) {
if (Notification.permission === "granted") {
for (const event of events) {
const notification = new Notification(`Event: ${event.type}`);
setTimeout(notification.close.bind(notification), 4 * 1000);
}
} else if (Notification.permission !== "denied") {
Notification.requestPermission(permission => {
if (permission === "granted") {
displayNotifications(events);
}
});
}
}
};
const SocketController = () => {
const dispatch = useDispatch();
const history = useHistory();
const authenticated = useSelector(state => state.session.authenticated);
const connectSocket = () => {
const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
const socket = new WebSocket(protocol + '//' + window.location.host + '/api/socket');
socket.onclose = () => {
setTimeout(() => connectSocket(), 60 * 1000);
};
socket.onmessage = (event) => {
const data = JSON.parse(event.data);
if (data.devices) {
dispatch(devicesActions.update(data.devices));
}
if (data.positions) {
dispatch(positionsActions.update(data.positions));
}
if (data.events) {
displayNotifications(data.events);
}
};
}
useEffect(() => {
if (authenticated) {
fetch('/api/devices').then(response => {
if (response.ok) {
response.json().then(devices => {
dispatch(devicesActions.update(devices));
});
}
connectSocket();
});
} else {
fetch('/api/session').then(response => {
if (response.ok) {
dispatch(sessionActions.authenticated(true));
} else {
history.push('/login');
}
});
}
}, [authenticated]);
return null;
}
export default connect()(SocketController);
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