import { NextRequest, NextResponse } from "next/server";
import { exec } from "child_process";
import { auth } from "@/lib/auth";
import { restoreSnapshot } from "@/lib/snapshots";
import { rebuildModpack, waitForServer } from "@/lib/mods";

export async function POST(req: NextRequest) {
  const session = await auth();
  if (!session) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 403 });
  }

  const { dirName } = await req.json();
  if (!dirName || dirName.includes("/") || dirName.includes("..")) {
    return NextResponse.json({ error: "Invalid snapshot" }, { status: 400 });
  }

  try {
    restoreSnapshot(dirName);

    await new Promise<void>((resolve, reject) => {
      exec("sudo systemctl restart minecraft.service", (err) => {
        if (err) reject(err);
        else resolve();
      });
    });

    const online = await waitForServer(90000);

    try {
      rebuildModpack();
    } catch {}

    return NextResponse.json({
      success: true,
      online,
      message: online
        ? "Snapshot restored. Server is online."
        : "Snapshot restored. Server is starting...",
    });
  } catch (e) {
    return NextResponse.json(
      { success: false, message: (e as Error).message },
      { status: 500 }
    );
  }
}