import { CorporateUser, Group, Type, User } from "@/interfaces/user";
import { getGroupsForUser, getParticipantGroups, getUserGroups, getUsersGroups } from "./groups.be";
import { last, uniq, uniqBy } from "lodash";
import { getUserCodes } from "./codes.be";
import moment from "moment";
import client from "@/lib/mongodb";

const db = client.db(process.env.MONGODB_DB);

export async function getUsers() {
	return await db.collection("users").find<User>({}).toArray();
}

export async function getUser(id: string): Promise<User | undefined> {
	const user = await db.collection("users").findOne<User>({ id });
	return !!user ? user : undefined;
}

export async function getSpecificUsers(ids: string[]) {
	if (ids.length === 0) return [];

	return await db
		.collection("users")
		.find<User>({ id: { $in: ids } })
		.toArray();
}

export async function getLinkedUsers(
	userID?: string,
	userType?: Type,
	type?: Type,
	page?: number,
	size?: number,
	sort?: string,
	direction?: "asc" | "desc",
	searchTerm?: string | undefined,
) {
	const filters: any = {};

	if (type) {
		filters.type = type;
	}

	if (searchTerm) {
		filters.$or = [
			{ name: { $regex: searchTerm, $options: 'i' } },
			{ email: { $regex: searchTerm, $options: 'i' } },
			{ company: { $regex: searchTerm, $options: 'i' } },
		];
	}

	if (!userID || userType === "admin" || userType === "developer") {
		const users = await db
			.collection("users")
			.find<User>(filters)
			.sort(sort ? { [sort]: direction === "desc" ? -1 : 1 } : {})
			.skip(page && size ? page * size : 0)
			.limit(size || 0)
			.toArray();
		const total = await db.collection("users").countDocuments(filters);
		return { users, total };
	}

	const adminGroups = await getUserGroups(userID);
	const groups = await getUsersGroups(adminGroups.flatMap((x) => x.participants));
	const belongingGroups = await getParticipantGroups(userID);

	const participants = uniq([
		...adminGroups.flatMap((x) => x.participants),
		...(userType === "mastercorporate" ? groups.flat().flatMap((x) => x.participants) : []),
		...(userType === "teacher" ? belongingGroups.flatMap((x) => x.participants) : []),
	]);

	//  ⨯ [FirebaseError: Invalid Query. A non-empty array is required for 'in' filters.] {
	if (participants.length === 0) return { users: [], total: 0 };

	const users = await db
		.collection("users")
		.find<User>({ ...filters, id: { $in: participants } })
		.skip(page && size ? page * size : 0)
		.limit(size || 0)
		.toArray();
	const total = await db.collection("users").countDocuments({ ...filters, id: { $in: participants } });

	return { users, total };
}

export async function getUserBalance(user: User) {
	const codes = await getUserCodes(user.id);
	if (user.type !== "corporate" && user.type !== "mastercorporate") return codes.length;

	const groups = await getGroupsForUser(user.id);
	const participants = uniq(groups.flatMap((x) => x.participants));

	if (user.type === "corporate") return participants.length + codes.filter((x) => !participants.includes(x.userId || "")).length;

	const participantUsers = await Promise.all(participants.map(getUser));
	const corporateUsers = participantUsers.filter((x) => x?.type === "corporate") as CorporateUser[];

	return (
		corporateUsers.reduce((acc, curr) => acc + curr.corporateInformation?.companyInformation?.userAmount || 0, 0) +
		corporateUsers.length +
		codes.filter((x) => !participants.includes(x.userId || "") && !corporateUsers.map((u) => u.id).includes(x.userId || "")).length
	);
}