import { NextRequest, NextResponse } from "next/server";
import { existsSync } from "fs";
import { join } from "path";
import { execSync, exec } from "child_process";
import { auth } from "@/lib/auth";
import { waitForServer } from "@/lib/mods";

export const dynamic = "force-dynamic";

const BACKUP_DIR = "/home/minecraft/server/backups";
const WORLD_DIR = "/home/minecraft/server/world";
const SERVER_DIR = "/home/minecraft/server";

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

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

  const filePath = join(BACKUP_DIR, name);
  if (!existsSync(filePath)) {
    return NextResponse.json({ error: "Backup not found" }, { status: 404 });
  }

  try {
    // Stop server
    execSync("sudo systemctl stop minecraft.service", { timeout: 30000 });

    // Wait for it to stop
    await new Promise((r) => setTimeout(r, 5000));

    // Remove current world
    execSync(`rm -rf ${WORLD_DIR}`);

    // Extract backup
    execSync(`tar xzf ${filePath} -C ${SERVER_DIR}`);

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

    const online = await waitForServer(90000);

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