Use ArmaEvents API for event display

[NeutraleNull]

This PR updates the frontend part of the HP to use the arma events instead of the our old forum.

I didn't touch any old stuff and mocked the output of AE to resemble the same format as before so the old code can work with it "out of the box".

[DerZade]

Thanks a lot for this.

You adjusted the frontend to access arma.events.
Instead we should keep the frontend implementation and just update the HP API to access arma.events instead of the forum.

See here:

gruppe-adler.de/api/src/utils/EventsService.ts

Lines 51 to 89 in a3ed07d

	private async fetchEvents (): Promise<ArmaEvent[]> {
	const response = await fetch(`${ArmaEventsService.FORUM_URI}/api/events/cid-3`);
	if (!response.ok) {
	throw new Error(`Error while trying to fetch events. Forum API responded with status code ${response.status}.`);
	}
	const { topics } = await response.json() as { topics: Array<{ slug: string, titleRaw: string, tid: number, deleted: 1 | 0, timestamp: number }> };
	const rawEvents: Array<Omit<ArmaEvent, 'attendance'> & { tid: number }> = [];
	for (const topic of topics) {
	if (topic.timestamp < ArmaEventsService.ATTENDANCE_PLUGIN_INTRODUCTION) continue;
	if (topic.deleted === 1) {
	console.warn(`Skipping topic ${topic.titleRaw} (ID: ${topic.tid}), because it was deleted`);
	continue;
	}
	if (!ArmaEventsService.TOPIC_TITLE_REGEX.test(topic.titleRaw)) {
	console.warn(`Skipping topic ${topic.titleRaw} (ID: ${topic.tid}), because its title did not match the required pattern.`);
	continue;
	}
	rawEvents.push({
	date: new Date(topic.titleRaw.substr(0, 10)),
	title: topic.titleRaw.replace(ArmaEventsService.TOPIC_TITLE_REGEX, ''),
	url: `${ArmaEventsService.FORUM_URI}/topic/${topic.slug}`,
	tid: topic.tid
	});
	}
	// events sorted with event furthest back in past as first item
	const sortedEvents = rawEvents.sort((a, b) => a.date.getTime() - b.date.getTime());
	// we only want one future event and a max of 10 events;
	// if there is no future event we just want the 10 most recent events
	const firstFutureEvent = sortedEvents.findIndex(e => ArmaEventsService.isInFuture(e.date)) + 1;
	const filteredEvents = sortedEvents.slice(0, firstFutureEvent > 0 ? firstFutureEvent : sortedEvents.length).reverse().slice(0, 10);
	const promises = filteredEvents.map(async ({ tid, ...rest }) => await ArmaEventsService.fetchAttendance(tid).then((attendance): ArmaEvent => ({ ...rest, attendance })));
	return await Promise.all(promises);
	}

This ensures that we don’t send unnecessary requests to arma.events and therefore improves performance for the user :)