import type { Person } from '$lib/types';

export type PersonEvent = {
	person: Person;
};

export function listenToPersonEvents(onPerson: (person: Person) => void) {
	let stopped = false;
	let source: EventSource | null = null;

	function connect() {
		if (stopped) return;
		source = new EventSource('/api/events');
		source.onmessage = (event) => {
			try {
				const data = JSON.parse(event.data) as PersonEvent;
				if (data.person) {
					onPerson(data.person);
				}
			} catch (err) {
				console.error('Failed to parse person event', err);
			}
		};

		source.onerror = () => {
			source?.close();
			source = null;
			if (stopped) return;
			setTimeout(connect, 2000);
		};
	}

	connect();

	return () => {
		stopped = true;
		source?.close();
		source = null;
	};
}