"use server";

import { requirePermission } from "@/lib/admin/guard";
import { PERMS } from "@/lib/permissions";
import { prisma } from "@/lib/prisma";

export interface MultiAccountCluster {
	key: string;
	label: string;
	accountCount: number;
	accounts: Array<{
		id: number;
		username: string;
		rank: number;
		online: string;
	}>;
}

export async function detectMultiAccounts({
	minAccounts,
	limit,
}: {
	minAccounts: number;
	limit: number;
}) {
	await requirePermission(PERMS.USERS_VIEW);
	const clusters: MultiAccountCluster[] = [];

	const ipGroups = await prisma.user.groupBy({
		by: ["ipCurrent"],
		where: { ipCurrent: { not: "" } },
		_count: { id: true },
		having: { id: { _count: { gte: minAccounts } } },
		orderBy: { _count: { id: "desc" } },
		take: limit,
	});

	for (const group of ipGroups) {
		const users = await prisma.user.findMany({
			where: { ipCurrent: group.ipCurrent },
			select: { id: true, username: true, rank: true, online: true },
			orderBy: { id: "asc" },
		});
		clusters.push({
			key: group.ipCurrent,
			label: `IP: ${group.ipCurrent}`,
			accountCount: group._count.id,
			accounts: users.map((u) => ({
				id: u.id,
				username: u.username,
				rank: u.rank,
				online: u.online,
			})),
		});
	}

	return { ok: true as const, data: { clusters } };
}