src/routes/conversation/[id]/+page.server.ts

import type { PageServerLoad } from './$types';
import { collections } from '$lib/server/database';
import type { Conversation } from '$lib/types/Conversation';
import { ObjectId } from 'mongodb';
import { error } from '@sveltejs/kit';

export const load: PageServerLoad = async (event) => {
	// todo: add validation on params.id
	const conversation = await collections.conversations.findOne({
		_id: new ObjectId(event.params.id),
		sessionId: event.locals.sessionId
	});

	if (!conversation) {
		throw error(404, 'Conversation not found');
	}

	return {
		messages: conversation.messages
	};
};