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import {GET} from '../modules/fetch.ts';
import {toggleElem, createElementFromHTML} from '../utils/dom.ts';
import {logoutFromWorker} from '../modules/worker.ts';
const {appSubUrl, notificationSettings, assetVersionEncoded} = window.config;
let notificationSequenceNumber = 0;
async function receiveUpdateCount(event: MessageEvent<{type: string, data: string}>) {
try {
const data = JSON.parse(event.data.data);
for (const count of document.querySelectorAll('.notification_count')) {
count.classList.toggle('tw-hidden', data.Count === 0);
count.textContent = `${data.Count}`;
}
await updateNotificationTable();
} catch (error) {
console.error(error, event);
}
}
export function initNotificationCount() {
if (!document.querySelector('.notification_count')) return;
let usingPeriodicPoller = false;
const startPeriodicPoller = (timeout: number, lastCount?: number) => {
if (timeout <= 0 || !Number.isFinite(timeout)) return;
usingPeriodicPoller = true;
lastCount = lastCount ?? getCurrentCount();
setTimeout(async () => {
await updateNotificationCountWithCallback(startPeriodicPoller, timeout, lastCount);
}, timeout);
};
if (notificationSettings.EventSourceUpdateTime > 0 && window.EventSource && window.SharedWorker) {
// Try to connect to the event source via the shared worker first
const worker = new SharedWorker(`${__webpack_public_path__}js/eventsource.sharedworker.js?v=${assetVersionEncoded}`, 'notification-worker');
worker.addEventListener('error', (event) => {
console.error('worker error', event);
});
worker.port.addEventListener('messageerror', () => {
console.error('unable to deserialize message');
});
worker.port.postMessage({
type: 'start',
url: `${window.location.origin}${appSubUrl}/user/events`,
});
worker.port.addEventListener('message', (event: MessageEvent<{type: string, data: string}>) => {
if (!event.data || !event.data.type) {
console.error('unknown worker message event', event);
return;
}
if (event.data.type === 'notification-count') {
receiveUpdateCount(event); // no await
} else if (event.data.type === 'no-event-source') {
// browser doesn't support EventSource, falling back to periodic poller
if (!usingPeriodicPoller) startPeriodicPoller(notificationSettings.MinTimeout);
} else if (event.data.type === 'error') {
console.error('worker port event error', event.data);
} else if (event.data.type === 'logout') {
if (event.data.data !== 'here') {
return;
}
worker.port.postMessage({
type: 'close',
});
worker.port.close();
logoutFromWorker();
} else if (event.data.type === 'close') {
worker.port.postMessage({
type: 'close',
});
worker.port.close();
}
});
worker.port.addEventListener('error', (e) => {
console.error('worker port error', e);
});
worker.port.start();
window.addEventListener('beforeunload', () => {
worker.port.postMessage({
type: 'close',
});
worker.port.close();
});
return;
}
startPeriodicPoller(notificationSettings.MinTimeout);
}
function getCurrentCount() {
return Number(document.querySelector('.notification_count').textContent ?? '0');
}
async function updateNotificationCountWithCallback(callback: (timeout: number, newCount: number) => void, timeout: number, lastCount: number) {
const currentCount = getCurrentCount();
if (lastCount !== currentCount) {
callback(notificationSettings.MinTimeout, currentCount);
return;
}
const newCount = await updateNotificationCount();
let needsUpdate = false;
if (lastCount !== newCount) {
needsUpdate = true;
timeout = notificationSettings.MinTimeout;
} else if (timeout < notificationSettings.MaxTimeout) {
timeout += notificationSettings.TimeoutStep;
}
callback(timeout, newCount);
if (needsUpdate) {
await updateNotificationTable();
}
}
async function updateNotificationTable() {
let notificationDiv = document.querySelector('#notification_div');
if (notificationDiv) {
try {
const params = new URLSearchParams(window.location.search);
params.set('div-only', 'true');
params.set('sequence-number', String(++notificationSequenceNumber));
const response = await GET(`${appSubUrl}/notifications?${params.toString()}`);
if (!response.ok) {
throw new Error('Failed to fetch notification table');
}
const data = await response.text();
const el = createElementFromHTML(data);
if (parseInt(el.getAttribute('data-sequence-number')) === notificationSequenceNumber) {
notificationDiv.outerHTML = data;
notificationDiv = document.querySelector('#notification_div');
window.htmx.process(notificationDiv); // when using htmx, we must always remember to process the new content changed by us
}
} catch (error) {
console.error(error);
}
}
}
async function updateNotificationCount(): Promise<number> {
try {
const response = await GET(`${appSubUrl}/notifications/new`);
if (!response.ok) {
throw new Error('Failed to fetch notification count');
}
const data = await response.json();
toggleElem('.notification_count', data.new !== 0);
for (const el of document.querySelectorAll('.notification_count')) {
el.textContent = `${data.new}`;
}
return data.new as number;
} catch (error) {
console.error(error);
return 0;
}
}
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