import { NextResponse } from "next/server";
import { status } from "minecraft-server-util";
import { execSync } from "child_process";
import { MC_SERVER_IP, MC_SERVER_PORT } from "@/lib/constants";
import { sendCommand } from "@/lib/rcon";

export const dynamic = "force-dynamic";

export async function GET() {
  // Tier 1: MC protocol ping (fastest, gives player/version info)
  try {
    const result = await status(MC_SERVER_IP, MC_SERVER_PORT, {
      timeout: 5000,
    });
    return NextResponse.json({
      online: true,
      players: { online: result.players.online, max: result.players.max },
      version: result.version.name,
      motd: result.motd.clean,
    });
  } catch {}

  // Tier 2: RCON (server is online but protocol ping failed)
  try {
    const response = await sendCommand("list");
    const match = response.match(/There are (\d+) of a max of (\d+) players/);
    return NextResponse.json({
      online: true,
      players: {
        online: match ? parseInt(match[1], 10) : 0,
        max: match ? parseInt(match[2], 10) : 20,
      },
    });
  } catch {}

  // Tier 3: systemctl (process alive but not yet accepting connections)
  let starting = false;
  try {
    const out = execSync("systemctl is-active minecraft.service", {
      encoding: "utf8",
    }).trim();
    starting = out === "active" || out === "activating";
  } catch {}

  return NextResponse.json({
    online: false,
    starting,
    players: { online: 0, max: 0 },
  });
}