import { User } from "@models/user";
let authorSingleton: {
	lastRefreshed: number;
	data: {
		username: string;
		_id: number;
		numStories: number;
	}[];
} = {
	data: [],
	lastRefreshed: Date.now(),
};

const threshold = 60 * 60 * 1000;
export default cachedEventHandler(
	async (ev) => {
		if (Date.now() - authorSingleton.lastRefreshed >= threshold || authorSingleton.data.length < 1)
			authorSingleton.data = await User.aggregate([
				{ $project: { username: true, _id: true } },
				{
					$lookup: {
						from: "stories",
						localField: "_id",
						foreignField: "author",
						as: "stories",
					},
				},
				{ $set: { numStories: { $size: "$stories" } } },
				{ $unset: "stories" },
				{
					$match: {
						numStories: { $gte: 1 },
						_id: { $nin: ev.context.currentUser?.hiddenAuthors || [] },
					},
				},
			]);
		authorSingleton.data.sort((a, b) => {
			if (a.username.toLocaleUpperCase() > b.username.toLocaleUpperCase()) return 1;
			else if (a.username.toLocaleUpperCase() < b.username.toLocaleUpperCase()) return -1;
			return 0;
		});
		return authorSingleton.data;
	},
	{ maxAge: 60 * 60 * 3 },
);