import net from "node:net";
import { NextResponse } from "next/server";
import { env } from "@/env";
import { withAdmin } from "@/lib/api-handler";
import { PERMS } from "@/lib/permissions";
import { prisma } from "@/lib/prisma";

function checkRcon(): Promise<boolean> {
  return new Promise((resolve) => {
    const host = env.RCON_HOST;
    const port = env.RCON_PORT;

    const socket = new net.Socket();
    const timeout = setTimeout(() => {
      socket.destroy();
      resolve(false);
    }, 3000);

    socket.connect(port, host, () => {
      clearTimeout(timeout);
      socket.destroy();
      resolve(true);
    });

    socket.on("error", () => {
      clearTimeout(timeout);
      socket.destroy();
      resolve(false);
    });
  });
}

export const GET = withAdmin({ permission: PERMS.DEVOPS_VIEW }, async () => {
  // DB health
  let dbOk = false;
  let dbLatency = 0;
  try {
    const start = Date.now();
    await prisma.$queryRaw`SELECT 1`;
    dbLatency = Date.now() - start;
    dbOk = true;
  } catch {
    dbOk = false;
  }

  // Emulator health (RCON TCP check)
  const emulator = await checkRcon();

  // Online users
  const onlineUsers = await prisma.user.count({ where: { online: "1" } });

  return NextResponse.json({
    database: dbOk,
    dbLatency,
    emulator,
    onlineUsers,
    timestamp: new Date().toISOString(),
  });
});