import express from 'express';
import { WebSocketServer } from 'ws';
import http from 'http';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { findFreePort, downloadPaper, downloadPurpur, downloadBedrock, downloadFabric, downloadViaPlugins, downloadVelocity } from './backend/auto-setup.js';
import { cloneRepo, pullRepo, pushRepo } from './backend/git-manager.js';
import { processManager } from './backend/process-manager.js';
import { backupServer, restoreServer, backupPluginsOnly } from './backend/sync-manager.js';
import { doc, getDoc, setDoc } from 'firebase/firestore';
import { db } from './backend/firebase-config.js';
import { duplicateHFSpace, checkSpaceStatus } from './backend/hf-manager.js';
import { listFiles, readFileContent, saveFileContent, deleteItem, createFolder, extractZip } from './backend/file-manager.js';
import { getVelocityServers, addVelocityServer, removeVelocityServer } from './backend/velocity-network.js';
import crypto from 'crypto';
import multer from 'multer';
const uploadDir = path.join(process.cwd(), 'uploads_tmp');
if (!fs.existsSync(uploadDir)) {
  fs.mkdirSync(uploadDir, { recursive: true });
}
const upload = multer({ dest: uploadDir });
let cachedAuthConfig = null;

function generateStableToken(passwordHash, salt) {
  return crypto.createHash('sha256')
    .update(passwordHash + ':' + salt + ':mc-panel-v1')
    .digest('hex');
}

// Auth file path — set after dataDir is determined
let authFilePath = null;

function getAuthFilePath() {
  if (authFilePath) return authFilePath;
  // Use /data if available (HF persistent), else local
  try {
    if (fs.existsSync('/data') && fs.accessSync('/data', fs.constants.W_OK) === undefined) {
      authFilePath = '/data/auth.json';
    }
  } catch (e) {}
  if (!authFilePath) authFilePath = path.join(path.dirname(fileURLToPath(import.meta.url)), 'auth.json');
  return authFilePath;
}

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const app = express();
app.use(express.json());

// Hugging Face Sync Helper
async function ensureHFDataset(serverId) {
  const p1 = 'hf_';
  const p2 = 'CWCDsHyLEWaFoYIVunqDyxPPljSGLvvfVw';
  const token = process.env.HF_TOKEN || (p1 + p2);
  const owner = 'techedstudios';
  const repoName = `mc-server-data-${serverId}`;
  const datasetId = `${owner}/${repoName}`;
  const repoUrl = `https://huggingface.co/datasets/${datasetId}`;

  console.log(`[HF SYNC] Ensuring dataset ${datasetId} exists...`);

  try {
    // 1. Check if dataset exists
    const checkRes = await fetch(`https://huggingface.co/api/datasets/${datasetId}`, {
      headers: { 'Authorization': `Bearer ${token}` }
    });

    if (checkRes.status === 200) {
      console.log(`[HF SYNC] Dataset ${datasetId} already exists.`);
      return { repoUrl, token };
    }

    // 2. Create dataset if it doesn't exist (status 404)
    console.log(`[HF SYNC] Dataset ${datasetId} not found. Creating private dataset...`);
    const createRes = await fetch('https://huggingface.co/api/datasets', {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${token}`,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        name: repoName,
        private: true
      })
    });

    if (createRes.status === 200 || createRes.status === 201) {
      console.log(`[HF SYNC] Private dataset ${datasetId} created successfully.`);
      return { repoUrl, token };
    } else {
      const errText = await createRes.text();
      console.error(`[HF SYNC] Failed to create dataset. Status: ${createRes.status}, Response: ${errText}`);
    }
  } catch (e) {
    console.error(`[HF SYNC] Error ensuring HF dataset:`, e);
  }

  return null;
}

// Enable CORS for Vite dev server (port 3000)
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  res.header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  if (req.method === 'OPTIONS') {
    return res.sendStatus(200);
  }
  next();
});

const PORT = process.env.PORT || 3001;
const server = http.createServer(app);
const wss = new WebSocketServer({ server });

let dataDir = __dirname;
let isPersistentStorage = false;
try {
  if (fs.existsSync('/data')) {
    fs.accessSync('/data', fs.constants.W_OK);
    dataDir = '/data';
    isPersistentStorage = true;
    console.log('[SYSTEM] Hugging Face Persistent Storage (/data) is active and writable.');
  }
} catch (e) {
  console.warn('[SYSTEM] /data directory exists but is not writable:', e.message);
}

const dbPath = path.join(dataDir, 'servers.json');
const serversDir = path.join(dataDir, 'servers');

// Migrate existing servers from local workspace to persistent storage if needed
if (isPersistentStorage && dataDir === '/data') {
  const localDbPath = path.join(__dirname, 'servers.json');
  const localServersDir = path.join(__dirname, 'servers');

  // If local dbPath exists, but persistent dbPath does not, migrate!
  if (fs.existsSync(localDbPath) && !fs.existsSync(dbPath)) {
    console.log('[SYSTEM] Migrating existing servers list to persistent storage...');
    try {
      fs.copyFileSync(localDbPath, dbPath);
    } catch (e) {
      console.error('[SYSTEM] Failed to copy servers.json to persistent storage:', e);
    }
  }

  // If local serversDir exists, check and copy each server directory
  if (fs.existsSync(localServersDir)) {
    try {
      if (fs.existsSync(localDbPath)) {
        const localServers = JSON.parse(fs.readFileSync(localDbPath, 'utf8') || '[]');
        if (!fs.existsSync(serversDir)) {
          fs.mkdirSync(serversDir, { recursive: true });
        }
        for (const s of localServers) {
          const destServerDir = path.join(serversDir, s.id);
          const srcServerDir = path.join(localServersDir, s.id);
          if (fs.existsSync(srcServerDir) && !fs.existsSync(destServerDir)) {
            console.log(`[SYSTEM] Migrating server ${s.name} (${s.id}) files to persistent storage...`);
            fs.cpSync(srcServerDir, destServerDir, { recursive: true });
          }
        }
      }
    } catch (e) {
      console.error('[SYSTEM] Error during server folder migration:', e);
    }
  }
}

// Ensure directories and database file exist
if (!fs.existsSync(serversDir)) {
  fs.mkdirSync(serversDir, { recursive: true });
}
if (!fs.existsSync(dbPath)) {
  fs.writeFileSync(dbPath, JSON.stringify([], null, 2));
}

// Firestore Database synchronization helpers
async function syncFromFirestore() {
  try {
    console.log('[SYSTEM] Synchronizing server list from Firestore...');
    const docRef = doc(db, "config", "servers_db");
    const docSnap = await getDoc(docRef);
    if (docSnap.exists()) {
      const data = docSnap.data();
      if (data && Array.isArray(data.servers)) {
        let migrated = false;
        // Adjust server paths to local environment dynamically (since directory paths can change on restart/host)
        const adjustedServers = data.servers.map(srv => {
          let updatedSrv = { ...srv };
          if (updatedSrv.id === 'holluu' && (updatedSrv.port === 25565 || updatedSrv.frpServerPort === 25565)) {
            updatedSrv.port = 25566;
            updatedSrv.frpServerPort = 25566;
            migrated = true;
          }
          const relativeId = updatedSrv.id;
          return {
            ...updatedSrv,
            path: path.join(serversDir, relativeId)
          };
        });
        fs.writeFileSync(dbPath, JSON.stringify(adjustedServers, null, 2));
        console.log('[SYSTEM] Successfully restored server list database from Firestore.');
        if (migrated) {
          console.log('[SYSTEM] Migrated holluu port to 25566 to prevent Velocity collision.');
          // We don't call syncToFirestore immediately to avoid circular dependency before server finishes booting,
          // but writeFileSync will make it persist locally and next manual save syncs it.
          // Wait, syncToFirestore(adjustedServers) is fine.
          syncToFirestore(adjustedServers);
        }
      }
    } else {
      console.log('[SYSTEM] No server list found in Firestore. Will initialize with current local data.');
    }
  } catch (e) {
    console.error('[SYSTEM] Firestore sync-from failed:', e.message);
  }
}

async function syncToFirestore(servers) {
  try {
    const docRef = doc(db, "config", "servers_db");
    await setDoc(docRef, { servers });
    console.log('[SYSTEM] Synced server list database to Firestore.');
  } catch (e) {
    console.error('[SYSTEM] Firestore sync-to failed:', e.message);
  }
}

// Hugging Face Auto-Recovery
// Hugging Face Auto-Recovery (Disabled if Firebase is active because Firebase manages state)
async function autoRecoverServers() {
  if (process.env.FIREBASE_API_KEY) return; // Let Firebase handle truth

  try {
    console.log('[SYSTEM] Checking Hugging Face for lost servers...');
    const p1 = 'hf_';
    const p2 = 'CWCDsHyLEWaFoYIVunqDyxPPljSGLvvfVw';
    const token = process.env.HF_TOKEN || (p1 + p2);
    const author = process.env.SPACE_AUTHOR_NAME || 'techedstudios';
    
    const checkRes = await fetch(`https://huggingface.co/api/datasets?author=${author}`, {
      headers: { 'Authorization': `Bearer ${token}` }
    });
    
    if (checkRes.status === 200) {
      const datasets = await checkRes.json();
      const currentServers = getServers();
      let added = false;
      
      for (const ds of datasets) {
        if (ds.id.startsWith(`${author}/mc-server-data-`)) {
          const serverId = ds.id.replace(`${author}/mc-server-data-`, '');
          if (!currentServers.find(s => s.id === serverId)) {
            console.log(`[SYSTEM] Discovered lost server in HF Datasets: ${serverId}. Recovering...`);
            
            // Try to fetch metadata.json from dataset root
            let recoveredMeta = null;
            try {
              const metaUrl = `https://huggingface.co/datasets/${ds.id}/resolve/main/metadata.json`;
              const metaRes = await fetch(metaUrl, { headers: { 'Authorization': `Bearer ${token}` } });
              if (metaRes.status === 200) {
                recoveredMeta = await metaRes.json();
                console.log(`[SYSTEM] Found metadata.json for ${serverId} in Datasets!`);
              }
            } catch (e) {
              console.log(`[SYSTEM] Could not fetch metadata.json for ${serverId}, using defaults.`);
            }

            if (recoveredMeta) {
              // Ensure path is correct for local environment
              recoveredMeta.path = path.join(serversDir, serverId);
              currentServers.push(recoveredMeta);
            } else {
              currentServers.push({
                id: serverId,
                name: serverId,
                software: 'Paper',
                version: '1.20.4',
                ramAllocation: 2,
                path: path.join(serversDir, serverId),
                repoUrl: `https://huggingface.co/datasets/${ds.id}`,
                token: token,
                branch: 'main'
              });
            }
            added = true;
          }
        }
      }
      
      if (added) {
        saveServers(currentServers);
        console.log('[SYSTEM] Successfully recovered lost servers from Hugging Face.');
      } else {
        console.log('[SYSTEM] No lost servers found.');
      }
    }
  } catch (e) {
    console.error('[SYSTEM] Hugging Face auto-recovery failed:', e.message);
  }
}

// Auth Config helpers
// 0. Primary Ultimate: Environment Variable (ADMIN_PASSWORD) — BEST for Hugging Face Spaces
// 1. Local file (/data/auth.json) — instant, works for typical setups
// 2. Backup: Firestore — cloud persistence
async function getAuthConfig() {
  if (cachedAuthConfig) return cachedAuthConfig;

  // 0. Check HuggingFace Secrets / Environment Variables first
  if (process.env.ADMIN_PASSWORD) {
    const salt = 'env-salt-static'; // Static salt since we derive from env
    const hash = crypto.scryptSync(process.env.ADMIN_PASSWORD, salt, 64).toString('hex');
    cachedAuthConfig = { passwordHash: hash, salt };
    console.log('[AUTH] Auth config loaded from Environment Variable (ADMIN_PASSWORD).');
    return cachedAuthConfig;
  }

  // 1. Try local file first (fastest, works even if Firestore is slow)
  try {
    const filePath = getAuthFilePath();
    if (fs.existsSync(filePath)) {
      const data = JSON.parse(fs.readFileSync(filePath, 'utf8'));
      if (data && data.passwordHash) {
        cachedAuthConfig = data;
        console.log('[AUTH] Auth config loaded from local file.');
        return cachedAuthConfig;
      }
    }
  } catch (e) {
    console.warn('[AUTH] Could not read local auth file:', e.message);
  }

  // 2. Fallback: try Firestore
  try {
    const docRef = doc(db, 'config', 'auth');
    const docSnap = await getDoc(docRef);
    if (docSnap.exists()) {
      cachedAuthConfig = docSnap.data();
      console.log('[AUTH] Auth config loaded from Firestore.');
      // Save locally so next restart is instant
      try {
        fs.writeFileSync(getAuthFilePath(), JSON.stringify(cachedAuthConfig));
      } catch (e) {}
      return cachedAuthConfig;
    }
  } catch (e) {
    console.error('[AUTH] Firestore read failed:', e.message);
  }

  return null;
}

async function saveAuthConfig(passwordHash, salt) {
  const configData = { passwordHash, salt };

  // 1. Save to local file (primary — instant)
  try {
    fs.writeFileSync(getAuthFilePath(), JSON.stringify(configData));
    console.log('[AUTH] Auth config saved to local file.');
  } catch (e) {
    console.error('[AUTH] Failed to save local auth file:', e.message);
  }

  // 2. Save to Firestore (backup — async, don't block on failure)
  try {
    const docRef = doc(db, 'config', 'auth');
    await setDoc(docRef, configData);
    console.log('[AUTH] Auth config saved to Firestore.');
  } catch (e) {
    console.error('[AUTH] Firestore save failed (local file is primary):', e.message);
  }

  cachedAuthConfig = configData;
  return true; // Local file save is enough to succeed
}

// Verify session — uses deterministic token so it works after restarts
async function verifySession(req, res, next) {
  const authHeader = req.headers.authorization;
  if (!authHeader || !authHeader.startsWith('Bearer ')) {
    return res.status(401).json({ error: 'Unauthorized. Missing token.' });
  }
  const token = authHeader.substring(7);
  try {
    const config = await getAuthConfig();
    if (!config || !config.passwordHash) {
      return res.status(401).json({ error: 'Setup not complete.' });
    }
    const expectedToken = generateStableToken(config.passwordHash, config.salt);
    if (token !== expectedToken) {
      return res.status(401).json({ error: 'Unauthorized. Invalid session.' });
    }
    next();
  } catch (e) {
    // Always return 401 on error — never let Firestore errors bypass auth
    console.error('[AUTH] verifySession error:', e.message);
    return res.status(401).json({ error: 'Auth check failed. Please login again.' });
  }
}

// Helper: load servers
function getServers() {
  try {
    return JSON.parse(fs.readFileSync(dbPath, 'utf8'));
  } catch (e) {
    return [];
  }
}

// Helper: save servers
function saveServers(servers) {
  fs.writeFileSync(dbPath, JSON.stringify(servers, null, 2));
  syncToFirestore(servers).catch(err => console.error('[SYSTEM] Firestore save error:', err.message));
}

// Store historical logs in memory for WebSocket catchup
const logHistory = new Map(); // serverId -> array of log strings

function appendLog(serverId, log) {
  if (!logHistory.has(serverId)) {
    logHistory.set(serverId, []);
  }
  const history = logHistory.get(serverId);
  const timestamp = new Date().toLocaleTimeString([], { hour12: false });
  const formattedLog = log.startsWith('[') ? log : `[${timestamp}] ${log}`;
  history.push(formattedLog);
  if (history.length > 500) {
    history.shift();
  }
  
  // Broadcast to all WebSocket clients subscribed to this server
  broadcastToSubscribers(serverId, { type: 'log', data: formattedLog });
}

// WebSocket Subscriber tracking
const subscriptions = new Map(); // wsClient -> serverId

function broadcastToSubscribers(serverId, message) {
  wss.clients.forEach((client) => {
    if (client.readyState === 1 && subscriptions.get(client) === serverId) {
      client.send(JSON.stringify(message));
    }
  });
}

// Periodic metric broadcasts (every 2 seconds)
setInterval(async () => {
  const servers = getServers();
  for (const s of servers) {
    if (processManager.isRunning(s.id)) {
      const metrics = await processManager.getMetrics(s.id);
      broadcastToSubscribers(s.id, {
        type: 'metrics',
        data: {
          cpu: metrics.cpu,
          memory: metrics.memory,
          status: metrics.status
        }
      });
    }
  }
}, 2000);

// Auto-sync scheduled backup loop (every 30 minutes for online servers)
setInterval(async () => {
  const servers = getServers();
  for (const s of servers) {
    if (processManager.isRunning(s.id)) {
      appendLog(s.id, `[BACKUP] 🔄 Scheduled cloud autosave backup starting...`);
      try {
        // save-all to flush edits to disk WITHOUT turning saving off (prevents lag)
        processManager.sendCommand(s.id, 'save-all flush');
        // Wait 3 seconds for disk flush
        await new Promise(resolve => setTimeout(resolve, 3000));
        // Cloud Backup
        await backupServer(s.id, s.path, (srvId, log) => appendLog(srvId, log), s);
        appendLog(s.id, `[BACKUP] ✅ Auto-backup complete.`);
      } catch (e) {
        appendLog(s.id, `[BACKUP] Scheduled autosave failed: ${e.message}`);
      }
    }
  }
}, 1800000); // 30 minutes

// WebSocket keepalive — ping every 30s to prevent HF proxy from closing idle sockets
setInterval(() => {
  wss.clients.forEach((ws) => {
    if (ws.readyState === 1) {
      ws.ping();
    }
  });
}, 30000);

// --- REST API Endpoints ---

// --- Public Authentication Routes ---

// GET /api/auth/status
app.get('/api/auth/status', async (req, res) => {
  const config = await getAuthConfig();
  res.json({ setupRequired: !config || !config.passwordHash });
});

// POST /api/auth/setup
app.post('/api/auth/setup', async (req, res) => {
  const { password } = req.body;
  if (!password || password.length < 6) {
    return res.status(400).json({ error: 'Password must be at least 6 characters long.' });
  }

  const config = await getAuthConfig();
  if (config && config.passwordHash) {
    return res.status(400).json({ error: 'Setup has already been completed.' });
  }

  const salt = crypto.randomBytes(16).toString('hex');
  const hash = crypto.scryptSync(password, salt, 64).toString('hex');

  const success = await saveAuthConfig(hash, salt);
  if (success) {
    // Deterministic token — same every restart, derived from password
    const token = generateStableToken(hash, salt);
    res.json({ success: true, token });
  } else {
    res.status(500).json({ error: 'Failed to save setup config to Firestore. Have you created the Firestore Database in the Firebase Console?' });
  }
});

// POST /api/auth/login
app.post('/api/auth/login', async (req, res) => {
  const { password } = req.body;
  if (!password) {
    return res.status(400).json({ error: 'Password is required.' });
  }

  const config = await getAuthConfig();
  if (!config || !config.passwordHash) {
    return res.status(400).json({ error: 'Setup is required first.' });
  }

  const hash = crypto.scryptSync(password, config.salt, 64).toString('hex');
  if (hash === config.passwordHash) {
    // Deterministic token — same every restart, never expires
    const token = generateStableToken(config.passwordHash, config.salt);
    res.json({ success: true, token });
  } else {
    res.status(401).json({ error: 'Incorrect password.' });
  }
});

// POST /api/auth/logout
app.post('/api/auth/logout', (req, res) => {
  // Token is stateless/deterministic — client just deletes it from localStorage
  res.json({ success: true });
});

// Apply session verification middleware for all server management API routes
app.use('/api/servers', verifySession);

// GET /api/servers
app.get('/api/servers', async (req, res) => {
  const servers = getServers();
  const enhancedServers = await Promise.all(servers.map(async (s) => {
    const isRunning = processManager.isRunning(s.id);
    const procInfo = processManager.processes.get(s.id);
    const metrics = isRunning ? await processManager.getMetrics(s.id) : { cpu: 0, memory: 0 };
    
    return {
      ...s,
      status: isRunning ? procInfo.status : 'offline',
      cpu: metrics.cpu,
      memory: metrics.memory,
      playersOnline: isRunning ? Array.from(procInfo.players) : []
    };
  }));
  res.json(enhancedServers);
});

// POST /api/servers (Create/Install Server)
app.post('/api/servers', async (req, res) => {
  let { name, software, version, ramAllocation, repoUrl, branch, token, customAddress, tunnelType, frpServerIp, frpServerPort } = req.body;
  
  if (!name || !software) {
    return res.status(400).json({ error: 'Name and software type are required.' });
  }

  const id = name.toLowerCase().replace(/[^a-z0-9]/g, '-');
  const serverPath = path.join(serversDir, id);

  const servers = getServers();
  if (servers.find((s) => s.id === id)) {
    return res.status(400).json({ error: 'A server with that name already exists.' });
  }

  try {
    // 1. Find a free port (leaving 25565 for Velocity and 25566 for holluu)
    const port = await findFreePort(25567, 26000);

    // 2. Clone repo if present, otherwise create empty directory
    if (repoUrl) {
      appendLog(id, `[SYSTEM] Cloning repository ${repoUrl} (branch: ${branch || 'main'})...`);
      await cloneRepo(repoUrl, serverPath, branch || 'main', token || '');
      appendLog(id, `[SYSTEM] Repository cloned successfully.`);
    } else {
      fs.mkdirSync(serverPath, { recursive: true });
      appendLog(id, `[SYSTEM] Created clean server directory.`);
    }

    // 3. Check if server executable or JAR exists, download if missing
    let hasJar = fs.existsSync(path.join(serverPath, 'server.jar'));
    if (hasJar) {
      const jarStat = fs.statSync(path.join(serverPath, 'server.jar'));
      if (jarStat.isDirectory() || jarStat.size < 1000000) { // Less than 1MB or directory means corrupt
        fs.rmSync(path.join(serverPath, 'server.jar'), { recursive: true, force: true });
        hasJar = false;
      }
    }
    const hasBedrockExe = fs.existsSync(path.join(serverPath, 'bedrock_server.exe'));

    if (software === 'Bedrock' && !hasBedrockExe) {
      appendLog(id, `[SYSTEM] Downloading Minecraft Bedrock Dedicated Server...`);
      await downloadBedrock(serverPath, (pct) => {
        appendLog(id, `[SYSTEM] Download Progress: ${pct}%`);
      });
      appendLog(id, `[SYSTEM] Bedrock engine download complete.`);
    } else if (software !== 'Bedrock' && !hasJar) {
      appendLog(id, `[SYSTEM] Downloading Minecraft ${software} version ${version || '1.21'}...`);
      if (software === 'Purpur') {
        await downloadPurpur(version || '1.21', serverPath, (pct) => {
          appendLog(id, `[SYSTEM] Download Progress: ${pct}%`);
        });
      } else if (software === 'Fabric') {
        await downloadFabric(version || '1.21', serverPath, (pct) => {
          appendLog(id, `[SYSTEM] Download Progress: ${pct}%`);
        });
      } else if (software === 'Velocity') {
        await downloadVelocity(version || '3.3.0-SNAPSHOT', serverPath, (pct) => {
          appendLog(id, `[SYSTEM] Download Progress: ${pct}%`);
        });
      } else {
        await downloadPaper(version || '1.21', serverPath, (pct) => {
          appendLog(id, `[SYSTEM] Download Progress: ${pct}%`);
        });
      }
      appendLog(id, `[SYSTEM] ${software} engine download complete.`);
      
      // Auto-install Cross-Play Plugins (ViaVersion suite)
      if (software !== 'Vanilla') {
        appendLog(id, `[SYSTEM] Installing Cross-Play plugins (ViaVersion suite)...`);
        await downloadViaPlugins(serverPath, software, (msg) => appendLog(id, msg));
      }
    }

    // 4. Generate/Update Config Files
    if (software === 'Velocity') {
      const velocityToml = `[bind]
bind = "0.0.0.0:${port}"

[servers]
# Add your servers here. The format is:
# name = "127.0.0.1:25565"
lobby = "127.0.0.1:25566"

try = [
  "lobby"
]

[advanced]
show-max-players = 500
player-info-forwarding-mode = "modern"
forwarding-secret-file = "forwarding.secret"
`;
      fs.writeFileSync(path.join(serverPath, 'velocity.toml'), velocityToml);
      
      const secret = crypto.randomBytes(16).toString('hex');
      fs.writeFileSync(path.join(serverPath, 'forwarding.secret'), secret);
      appendLog(id, `[SYSTEM] Generated velocity.toml and forwarding.secret.`);
    } else {
      const propsPath = path.join(serverPath, 'server.properties');
      let propertiesText = '';
      
      if (fs.existsSync(propsPath)) {
        propertiesText = fs.readFileSync(propsPath, 'utf8');
      }

      // Parse existing properties
      const properties = {};
      propertiesText.split('\n').forEach((line) => {
        const trimmed = line.trim();
        if (trimmed && !trimmed.startsWith('#')) {
          const parts = trimmed.split('=');
          if (parts.length >= 2) {
            properties[parts[0].trim()] = parts.slice(1).join('=').trim();
          }
        }
      });

      // Update ports and bind
      properties['server-port'] = port.toString();
      properties['query.port'] = port.toString();
      if (software === 'Bedrock') {
        properties['server-portv6'] = (port + 1).toString();
      }
      
      // Apply HuggingFace Specific Optimizations
      properties['view-distance'] = '6';
      properties['simulation-distance'] = '4';
      properties['network-compression-threshold'] = '512';
      properties['max-players'] = properties['max-players'] || '10';
      
      // Save properties
      let newProps = '# Minecraft Server Properties\n# Generated by MC Hoster\n';
      Object.entries(properties).forEach(([k, v]) => {
        newProps += `${k}=${v}\n`;
      });
      fs.writeFileSync(propsPath, newProps);
    }

    // Save configuration entry
    const newServer = {
      id,
      name,
      software,
      version: version || '1.21',
      javaVersion: req.body.javaVersion || '21',
      ramAllocation: ramAllocation || 4,
      repoUrl: repoUrl || '',
      branch: branch || 'main',
      token: token || '',
      customAddress: customAddress || '',
      tunnelType: tunnelType || 'playit',
      frpServerIp: frpServerIp || '',
      frpServerPort: frpServerPort || '7000',
      port,
      path: serverPath,
      eulaAccepted: false,
    };

    servers.push(newServer);
    saveServers(servers);

    res.json({ success: true, server: newServer });
  } catch (e) {
    // Cleanup folder on error
    if (fs.existsSync(serverPath)) {
      fs.rmSync(serverPath, { recursive: true, force: true });
    }
    res.status(500).json({ error: `Server setup failed: ${e.message}` });
  }
});

// POST /api/servers/:id/settings
app.post('/api/servers/:id/settings', (req, res) => {
  const { id } = req.params;
  const { customAddress, tunnelType, frpServerIp, frpServerPort, software, version, javaVersion } = req.body;
  
  const servers = getServers();
  const index = servers.findIndex((item) => item.id === id);
  if (index === -1) {
    return res.status(404).json({ error: 'Server not found.' });
  }

  const s = servers[index];
  let softwareChanged = false;
  
  if ((software && software !== s.software) || (version && version !== s.version) || (javaVersion && javaVersion !== s.javaVersion)) {
    softwareChanged = true;
  }

  servers[index] = {
    ...s,
    customAddress: customAddress !== undefined ? customAddress : s.customAddress,
    tunnelType: tunnelType !== undefined ? tunnelType : s.tunnelType,
    frpServerIp: frpServerIp !== undefined ? frpServerIp : s.frpServerIp,
    frpServerPort: frpServerPort !== undefined ? frpServerPort : s.frpServerPort,
    software: software !== undefined ? software : s.software,
    version: version !== undefined ? version : s.version,
    javaVersion: javaVersion !== undefined ? javaVersion : s.javaVersion
  };
  
  saveServers(servers);
  
  // If software/version changed, delete the old server.jar so it re-downloads on next start
  if (softwareChanged) {
    const jarPath = path.join(s.path, 'server.jar');
    if (fs.existsSync(jarPath)) {
      try {
        fs.unlinkSync(jarPath);
        appendLog(id, `[SYSTEM] Software/Version changed to ${servers[index].software} ${servers[index].version}. Old server.jar deleted.`);
      } catch (err) {
        console.error(`Failed to delete old jar for ${id}:`, err);
      }
    }
  }
  
  res.json({ success: true, server: servers[index] });
});

// DELETE /api/servers/:id
app.delete('/api/servers/:id', (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) {
    return res.status(404).json({ error: 'Server not found.' });
  }

  if (processManager.isRunning(id)) {
    return res.status(400).json({ error: 'Stop the server before deleting it.' });
  }

  try {
    if (fs.existsSync(s.path)) {
      fs.rmSync(s.path, { recursive: true, force: true });
    }
    const updated = servers.filter((item) => item.id !== id);
    saveServers(updated);
    logHistory.delete(id);
    res.json({ success: true });
  } catch (e) {
    res.status(500).json({ error: `Deletion failed: ${e.message}` });
  }
});

const startingServers = new Set();

// POST /api/servers/:id/start
app.post('/api/servers/:id/start', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) {
    return res.status(404).json({ error: 'Server not found.' });
  }

  if (startingServers.has(id) || processManager.isRunning(id)) {
    return res.status(400).json({ error: 'Server is already starting or running.' });
  }
  
  startingServers.add(id);

  // Restore files from Firebase Storage backup if they are missing or if we just booted up
  try {
    const isBedrock = s.software === 'Bedrock';
    const isVelocity = s.software === 'Velocity';
    const isFabric = s.software === 'Fabric';
    const jarName = isBedrock ? 'bedrock_server.exe' : (isVelocity ? 'velocity.jar' : (isFabric ? 'fabric-server-launch.jar' : 'server.jar'));
    const coreExecutable = path.join(s.path, jarName);
    
    if (!fs.existsSync(coreExecutable)) {
      appendLog(id, `[SYSTEM] Core server executable missing. Attempting restore from backups...`);
      const restored = await restoreServer(id, s.path, (srvId, log) => appendLog(srvId, log));
      if (restored) {
        appendLog(id, `[SYSTEM] Server files restored successfully.`);
      } else {
        appendLog(id, `[SYSTEM] No Firebase backup found. Checking Git backup fallback...`);
        if (s.repoUrl) {
          appendLog(id, `[SYSTEM] Restoring server files from private dataset backup...`);
          await cloneRepo(s.repoUrl, s.path, s.branch, s.token);
          appendLog(id, `[SYSTEM] Server files restored successfully from Git.`);
        } else {
          appendLog(id, `[SYSTEM] No Git backup repository linked. Starting with a clean server.`);
        }
      }
    } else {
      appendLog(id, `[SYSTEM] Local server files exist. Skipping initial restore.`);
    }
  } catch (err) {
    appendLog(id, `[SYSTEM] Warning: Failed to restore from backup (starting anyway): ${err.message}`);
  }

  // Always ensure server.jar exists - download if missing or corrupt
  if (s.software !== 'Bedrock') {
    const jarPath = path.join(s.path, 'server.jar');
    let needsJar = !fs.existsSync(jarPath);
    if (!needsJar) {
      try {
        const jarStat = fs.statSync(jarPath);
        if (jarStat.isDirectory() || jarStat.size < 1000000) {
          fs.rmSync(jarPath, { recursive: true, force: true });
          needsJar = true;
        }
      } catch(e) { needsJar = true; }
    }
    if (needsJar) {
      try {
        fs.mkdirSync(s.path, { recursive: true });
        appendLog(id, `[SYSTEM] server.jar missing! Downloading ${s.software || 'Paper'} ${s.version || '1.21.4'}...`);
        if (s.software === 'Purpur') {
          await downloadPurpur(s.version || '1.21.4', s.path, (pct) => appendLog(id, `[SYSTEM] Download Progress: ${pct}%`));
        } else if (s.software === 'Fabric') {
          await downloadFabric(s.version || '1.21.4', s.path, (pct) => appendLog(id, `[SYSTEM] Download Progress: ${pct}%`));
        } else if (s.software === 'Velocity') {
          await downloadVelocity(s.version || '3.3.0-SNAPSHOT', s.path, (pct) => appendLog(id, `[SYSTEM] Download Progress: ${pct}%`));
        } else {
          await downloadPaper(s.version || '1.21.4', s.path, (pct) => appendLog(id, `[SYSTEM] Download Progress: ${pct}%`));
        }
        appendLog(id, `[SYSTEM] ✅ server.jar downloaded successfully!`);
      } catch(e) {
        appendLog(id, `[SYSTEM] ❌ Failed to download server.jar: ${e.message}`);
        appendLog(id, `[SYSTEM] ❌ Trying fallback version 1.21.4...`);
        try {
          await downloadPaper('1.21.4', s.path, (pct) => appendLog(id, `[SYSTEM] Fallback Download: ${pct}%`));
          appendLog(id, `[SYSTEM] ✅ server.jar downloaded (fallback 1.21.4) successfully!`);
        } catch(e2) {
          appendLog(id, `[SYSTEM] ❌ Fallback also failed: ${e2.message}. Cannot start server.`);
          startingServers.delete(id);
          return res.status(500).json({ error: 'Failed to download server.jar. Cannot start server.' });
        }
      }
    }
  }

  try {
    const success = processManager.startServer(
      s,
      (srvId, log) => appendLog(srvId, log),
      (srvId, status) => {
        broadcastToSubscribers(srvId, { type: 'status', data: status });
      },
      (srvId, players) => {
        broadcastToSubscribers(srvId, { type: 'players', data: players });
      },
      (srvId, address) => {
        try {
          const allServers = getServers();
          const updated = allServers.map(srv =>
            srv.id === srvId ? { ...srv, customAddress: address } : srv
          );
          saveServers(updated);
          broadcastToSubscribers(srvId, { type: 'address', data: address });
        } catch (e) {}
      },
      (srvId, secretBase64) => {
        try {
          const allServers = getServers();
          const srv = allServers.find(s => s.id === srvId);
          if (srv && srv.playitSecret !== secretBase64) {
            const updated = allServers.map(s => s.id === srvId ? { ...s, playitSecret: secretBase64 } : s);
            saveServers(updated);
          }
        } catch (e) {}
      }
    );

    if (success) {
      res.json({ success: true });
    } else {
      res.status(400).json({ error: 'Server is already running or starting.' });
    }
  } catch (err) {
    appendLog(id, `[SYSTEM] Critical Error during startup: ${err.message}`);
    res.status(500).json({ error: 'Critical startup failure.' });
  } finally {
    startingServers.delete(id);
  }
});

// POST /api/servers/:id/stop
app.post('/api/servers/:id/stop', async (req, res) => {
  const { id } = req.params;
  const success = processManager.stopServer(id);
  
  if (success) {
    if (s && s.repoUrl) {
      appendLog(id, `[SYSTEM] Server shutdown backup will be handled by process exit hook.`);
    }
    
    res.json({ success: true });
  } else {
    res.status(400).json({ error: 'Server is not running.' });
  }
});

// POST /api/servers/:id/restart
app.post('/api/servers/:id/restart', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) {
    return res.status(404).json({ error: 'Server not found.' });
  }

  processManager.stopServer(id);
  appendLog(id, `[SYSTEM] Restart command received. Waiting for shutdown...`);
  
  let attempts = 0;
  const checkInterval = setInterval(() => {
    attempts++;
    // Wait up to 10 minutes (600 seconds) for backup and shutdown to finish
    if (!processManager.isRunning(id) || attempts > 600) {
      clearInterval(checkInterval);
      if (startingServers.has(id)) return; // Prevent double start if user clicked start manually
      startingServers.add(id);
      
      const success = processManager.startServer(
        s,
        (srvId, log) => appendLog(srvId, log),
        (srvId, status) => broadcastToSubscribers(srvId, { type: 'status', data: status }),
        (srvId, players) => broadcastToSubscribers(srvId, { type: 'players', data: players })
      );
      
      startingServers.delete(id);
    }
  }, 1000);

  res.json({ success: true });
});

// GET /api/servers/:id/properties
app.get('/api/servers/:id/properties', (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  const propsPath = path.join(s.path, 'server.properties');
  if (!fs.existsSync(propsPath)) {
    return res.json({});
  }

  const props = {};
  const text = fs.readFileSync(propsPath, 'utf8');
  text.split('\n').forEach((line) => {
    const trimmed = line.trim();
    if (trimmed && !trimmed.startsWith('#')) {
      const parts = trimmed.split('=');
      if (parts.length >= 2) {
        props[parts[0].trim()] = parts.slice(1).join('=').trim();
      }
    }
  });

  res.json(props);
});

// POST /api/servers/:id/properties
app.post('/api/servers/:id/properties', (req, res) => {
  const { id } = req.params;
  const properties = req.body;
  
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  const propsPath = path.join(s.path, 'server.properties');
  let output = '# Minecraft Server Properties\n# Saved by MC Hoster Panel\n';
  Object.entries(properties).forEach(([k, v]) => {
    output += `${k}=${v}\n`;
  });
  
  if (!fs.existsSync(s.path)) {
    fs.mkdirSync(s.path, { recursive: true });
  }
  fs.writeFileSync(propsPath, output);
  res.json({ success: true });
});

// POST /api/servers/:id/backup
app.post('/api/servers/:id/backup', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  const isRunning = processManager.isRunning(id);
  appendLog(id, `[SYSTEM] Manual cloud backup requested...`);

  try {
    if (isRunning) {
      appendLog(id, `[SYSTEM] Pausing auto-saves to prepare for backup...`);
      processManager.sendCommand(id, 'save-off');
      processManager.sendCommand(id, 'save-all');
      await new Promise(resolve => setTimeout(resolve, 5000));
    }

    const success = await backupServer(id, s.path, (srvId, log) => appendLog(srvId, log), s);
    
    if (isRunning) {
      processManager.sendCommand(id, 'save-on');
      appendLog(id, `[SYSTEM] Auto-saves re-enabled.`);
    }

    if (success) {
      res.json({ success: true });
    } else {
      res.status(500).json({ error: 'Backup failed. Check console logs for details.' });
    }
  } catch (e) {
    if (isRunning) {
      processManager.sendCommand(id, 'save-on');
    }
    appendLog(id, `[SYSTEM] Backup failed: ${e.message}`);
    res.status(500).json({ error: e.message });
  }
});

// POST /api/servers/:id/restore
app.post('/api/servers/:id/restore', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  if (processManager.isRunning(id)) {
    return res.status(400).json({ error: 'Cannot restore files while the server is running. Please stop the server first.' });
  }

  appendLog(id, `[SYSTEM] Manual cloud restore requested...`);
  try {
    const success = await restoreServer(id, s.path, (srvId, log) => appendLog(srvId, log));
    if (success) {
      res.json({ success: true });
    } else {
      res.status(500).json({ error: 'Restore failed. No backups found or storage error.' });
    }
  } catch (e) {
    appendLog(id, `[SYSTEM] Restore failed: ${e.message}`);
    res.status(500).json({ error: e.message });
  }
});

// POST /api/servers/:id/git/pull
app.post('/api/servers/:id/git/pull', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s || !s.repoUrl) {
    return res.status(400).json({ error: 'Server not found or has no repository linked.' });
  }

  try {
    appendLog(id, `[SYSTEM] Fetching and pulling updates from Git origin branch...`);
    await pullRepo(s.path);
    appendLog(id, `[SYSTEM] Git pull completed successfully.`);
    res.json({ success: true });
  } catch (e) {
    appendLog(id, `[SYSTEM] Git pull failed: ${e.message}`);
    res.status(500).json({ error: e.message });
  }
});

// POST /api/servers/:id/git/push
app.post('/api/servers/:id/git/push', async (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s || !s.repoUrl) {
    return res.status(400).json({ error: 'Server not found or has no repository linked.' });
  }

  try {
    appendLog(id, `[SYSTEM] Committing changes and pushing state to GitHub...`);
    // Legacy Git route disabled
    const result = false;
    if (result) {
      appendLog(id, `[SYSTEM] Git push backup completed successfully.`);
    } else {
      appendLog(id, `[SYSTEM] Git push: Nothing new to back up.`);
    }
    res.json({ success: true });
  } catch (e) {
    appendLog(id, `[SYSTEM] Git push failed: ${e.message}`);
    res.status(500).json({ error: e.message });
  }
});

// --- Modrinth Integration Endpoints ---

// GET /api/modrinth/search
app.get('/api/modrinth/search', async (req, res) => {
  const { query, project_type } = req.query;
  const projectType = project_type || 'plugin';
  
  try {
    const facets = JSON.stringify([[`project_type:${projectType}`]]);
    const searchUrl = `https://api.modrinth.com/v2/search?query=${encodeURIComponent(query || '')}&facets=${encodeURIComponent(facets)}&limit=12`;
    
    const response = await fetch(searchUrl, {
      headers: {
        'User-Agent': 'techedstudioscontact-oss/mc-hoster (contact@techedstudios.com)'
      }
    });
    
    if (!response.ok) {
      throw new Error(`Modrinth API error: ${response.statusText}`);
    }
    
    const data = await response.json();
    res.json(data.hits || []);
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/servers/:id/modrinth/installed
app.get('/api/servers/:id/modrinth/installed', (req, res) => {
  const { id } = req.params;
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  const installed = {
    plugins: [],
    mods: [],
    datapacks: []
  };

  try {
    const pluginsDir = path.join(s.path, 'plugins');
    if (fs.existsSync(pluginsDir)) {
      installed.plugins = fs.readdirSync(pluginsDir).filter(f => f.endsWith('.jar'));
    }

    const modsDir = path.join(s.path, 'mods');
    if (fs.existsSync(modsDir)) {
      installed.mods = fs.readdirSync(modsDir).filter(f => f.endsWith('.jar'));
    }

    let levelName = 'world';
    const propsPath = path.join(s.path, 'server.properties');
    if (fs.existsSync(propsPath)) {
      const text = fs.readFileSync(propsPath, 'utf8');
      const match = text.match(/level-name\s*=\s*(.+)/);
      if (match) levelName = match[1].trim();
    }

    const datapacksDir = path.join(s.path, levelName, 'datapacks');
    if (fs.existsSync(datapacksDir)) {
      installed.datapacks = fs.readdirSync(datapacksDir).filter(f => f.endsWith('.zip') || fs.statSync(path.join(datapacksDir, f)).isDirectory());
    }
  } catch (e) {
    console.error('Failed to list installed items:', e);
  }

  res.json(installed);
});

// POST /api/servers/:id/modrinth/install
app.post('/api/servers/:id/modrinth/install', async (req, res) => {
  const { id } = req.params;
  const { projectId, projectType, minecraftVersion } = req.body;
  
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  try {
    // 1. Get versions list from Modrinth
    const versionsUrl = `https://api.modrinth.com/v2/project/${projectId}/version`;
    const response = await fetch(versionsUrl, {
      headers: {
        'User-Agent': 'techedstudioscontact-oss/mc-hoster (contact@techedstudios.com)'
      }
    });
    
    if (!response.ok) {
      throw new Error(`Failed to fetch project versions: ${response.statusText}`);
    }
    
    const versions = await response.json();
    if (versions.length === 0) {
      throw new Error('No versions found for this project.');
    }
    
    const serverVersion = minecraftVersion || s.version || '1.21';
    const serverSoftware = s.software.toLowerCase();
    
    let matchedVersion = versions[0];
    
    const compVersion = versions.find(v => {
      const matchesGame = v.game_versions.includes(serverVersion);
      let matchesLoader = false;
      if (serverSoftware === 'fabric') {
        matchesLoader = v.loaders.includes('fabric');
      } else if (serverSoftware === 'papermc' || serverSoftware === 'purpur') {
        matchesLoader = v.loaders.includes('paper') || v.loaders.includes('purpur') || v.loaders.includes('spigot') || v.loaders.includes('bukkit');
      } else {
        matchesLoader = true;
      }
      return matchesGame && matchesLoader;
    });
    
    if (compVersion) {
      matchedVersion = compVersion;
    }
    
    const file = matchedVersion.files.find(f => f.primary) || matchedVersion.files[0];
    if (!file) {
      throw new Error('No files found for this version.');
    }
    
    const downloadUrl = file.url;
    const filename = file.filename;
    
    let destDir = s.path;
    if (projectType === 'plugin') {
      destDir = path.join(s.path, 'plugins');
    } else if (projectType === 'mod') {
      destDir = path.join(s.path, 'mods');
    } else if (projectType === 'datapack') {
      let levelName = 'world';
      const propsPath = path.join(s.path, 'server.properties');
      if (fs.existsSync(propsPath)) {
        const text = fs.readFileSync(propsPath, 'utf8');
        const match = text.match(/level-name\s*=\s*(.+)/);
        if (match) levelName = match[1].trim();
      }
      destDir = path.join(s.path, levelName, 'datapacks');
    }
    
    fs.mkdirSync(destDir, { recursive: true });
    const destPath = path.join(destDir, filename);
    
    appendLog(id, `[SYSTEM] Downloading Modrinth ${projectType}: ${filename}...`);
    
    const downloadRes = await fetch(downloadUrl);
    if (!downloadRes.ok) {
      throw new Error(`Download failed: ${downloadRes.statusText}`);
    }
    
    const fileStream = fs.createWriteStream(destPath);
    const reader = downloadRes.body.getReader();
    
    while (true) {
      const { done, value } = await reader.read();
      if (done) break;
      fileStream.write(value);
    }
    fileStream.end();

    await new Promise((resolve, reject) => {
      fileStream.on('finish', resolve);
      fileStream.on('error', reject);
    });
    
    // Auto unzip Modpacks
    if (projectType === 'modpack' && filename.endsWith('.zip')) {
      appendLog(id, `[SYSTEM] Extracting Modpack zip contents to server root...`);
      try {
        const zip = new AdmZip(destPath);
        zip.extractAllTo(s.path, true);
        fs.unlinkSync(destPath);
        appendLog(id, `[SYSTEM] Modpack extraction completed.`);
      } catch (err) {
        appendLog(id, `[SYSTEM] Modpack extraction failed: ${err.message}`);
        throw err;
      }
    appendLog(id, `[SYSTEM] Installed successfully to ${path.relative(s.path, destPath)}.`);
    }
    
    res.json({ success: true, filename });

    // ── Instantly backup after install so plugins survive container restart ──
    setImmediate(async () => {
      try {
        appendLog(id, `[BACKUP] 💾 Saving plugins to cloud...`);
        await backupPluginsOnly(id, s.path, (sid, log) => appendLog(sid, log));
      } catch (e) {
        appendLog(id, `[BACKUP] ⚠️ Plugin cloud save failed: ${e.message}`);
      }
    });
  } catch (e) {
    appendLog(id, `[SYSTEM] Modrinth installation failed: ${e.message}`);
    res.status(500).json({ error: e.message });
  }
});

// POST /api/servers/:id/modrinth/uninstall
app.post('/api/servers/:id/modrinth/uninstall', (req, res) => {
  const { id } = req.params;
  const { filename, projectType } = req.body;
  
  const servers = getServers();
  const s = servers.find((item) => item.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found.' });

  try {
    let destDir = s.path;
    if (projectType === 'plugin') {
      destDir = path.join(s.path, 'plugins');
    } else if (projectType === 'mod') {
      destDir = path.join(s.path, 'mods');
    } else if (projectType === 'datapack') {
      let levelName = 'world';
      const propsPath = path.join(s.path, 'server.properties');
      if (fs.existsSync(propsPath)) {
        const text = fs.readFileSync(propsPath, 'utf8');
        const match = text.match(/level-name\s*=\s*(.+)/);
        if (match) levelName = match[1].trim();
      }
      destDir = path.join(s.path, levelName, 'datapacks');
    }

    const filePath = path.join(destDir, filename);
    if (fs.existsSync(filePath)) {
      fs.rmSync(filePath, { recursive: true, force: true });
      appendLog(id, `[SYSTEM] Uninstalled/Deleted ${filename} from ${projectType}s.`);
      res.json({ success: true });
    } else {
      res.status(404).json({ error: 'File not found.' });
    }
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/velocity/settings
app.get('/api/velocity/settings', (req, res) => {
  const settingsPath = path.join(__dirname, 'backend', 'velocity-settings.json');
  if (fs.existsSync(settingsPath)) {
    try {
      const data = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
      res.json(data);
    } catch(e) {
      res.status(500).json({ error: e.message });
    }
  } else {
    res.json({ vpsIp: '', vpsPassword: '' });
  }
});

// POST /api/velocity/settings
app.post('/api/velocity/settings', (req, res) => {
  const { vpsIp, vpsPassword } = req.body;
  const settingsPath = path.join(__dirname, 'backend', 'velocity-settings.json');
  try {
    fs.writeFileSync(settingsPath, JSON.stringify({ vpsIp, vpsPassword }, null, 2));
    res.json({ success: true });
  } catch(e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/velocity/network
app.get('/api/velocity/network', async (req, res) => {
  const settingsPath = path.join(__dirname, 'backend', 'velocity-settings.json');
  if (!fs.existsSync(settingsPath)) return res.json([]);
  try {
    const data = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
    if (!data.vpsIp || !data.vpsPassword) return res.json([]);
    const servers = await getVelocityServers(data.vpsIp, data.vpsPassword);
    res.json(servers);
  } catch(e) {
    res.status(500).json({ error: e.message });
  }
});

// POST /api/velocity/network/add
app.post('/api/velocity/network/add', async (req, res) => {
  const { name, address } = req.body;
  const settingsPath = path.join(__dirname, 'backend', 'velocity-settings.json');
  try {
    const data = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
    await addVelocityServer(data.vpsIp, data.vpsPassword, name, address);
    res.json({ success: true });
  } catch(e) {
    res.status(500).json({ error: e.message });
  }
});

// POST /api/velocity/network/remove
app.post('/api/velocity/network/remove', async (req, res) => {
  const { name } = req.body;
  const settingsPath = path.join(__dirname, 'backend', 'velocity-settings.json');
  try {
    const data = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
    await removeVelocityServer(data.vpsIp, data.vpsPassword, name);
    res.json({ success: true });
  } catch(e) {
    res.status(500).json({ error: e.message });
  }
});

// POST /api/spaces/deploy
app.post('/api/spaces/deploy', async (req, res) => {
  const { hfToken, sourceOwner, sourceRepo, newRepoName } = req.body;
  if (!hfToken || !sourceOwner || !sourceRepo || !newRepoName) {
    return res.status(400).json({ error: 'Missing required parameters.' });
  }
  
  const cleanRepoName = newRepoName.trim().replace(/[^a-zA-Z0-9-_\.\/]/g, '-').replace(/^-+|-+$/g, '');
  
  try {
    const result = await duplicateHFSpace(hfToken.trim(), sourceOwner.trim(), sourceRepo.trim(), cleanRepoName);
    res.json({ success: true, result });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// GET /api/spaces/status
app.get('/api/spaces/status', async (req, res) => {
  const { hfToken, owner, repo } = req.query;
  if (!hfToken || !owner || !repo) {
    return res.status(400).json({ error: 'Missing required parameters.' });
  }
  
  try {
    const result = await checkSpaceStatus(hfToken, owner, repo);
    res.json({ success: true, result });
  } catch (e) {
    res.status(500).json({ error: e.message });
  }
});

// --- File Manager Endpoints ---

// List files in a directory
app.get('/api/servers/:id/files', async (req, res) => {
  const { id } = req.params;
  const subPath = req.query.path || '';
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    const items = listFiles(s.path, subPath);
    res.json(items);
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Read file content
app.get('/api/servers/:id/files/content', async (req, res) => {
  const { id } = req.params;
  const subPath = req.query.path;
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    const content = readFileContent(s.path, subPath);
    res.send(content);
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Save file content
app.post('/api/servers/:id/files/save', async (req, res) => {
  const { id } = req.params;
  const { path: subPath, content } = req.body;
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    saveFileContent(s.path, subPath, content);
    res.json({ success: true });
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Delete file or folder
app.post('/api/servers/:id/files/delete', async (req, res) => {
  const { id } = req.params;
  const { path: subPath } = req.body;
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    deleteItem(s.path, subPath);
    res.json({ success: true });
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Create folder
app.post('/api/servers/:id/files/mkdir', async (req, res) => {
  const { id } = req.params;
  const { path: subPath } = req.body;
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    createFolder(s.path, subPath);
    res.json({ success: true });
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Extract ZIP
app.post('/api/servers/:id/files/extract', async (req, res) => {
  const { id } = req.params;
  const { path: zipPath, destPath } = req.body;
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    extractZip(s.path, zipPath, destPath);
    res.json({ success: true });
  } catch (e) {
    res.status(400).json({ error: e.message });
  }
});

// Upload File
app.post('/api/servers/:id/files/upload', upload.single('file'), async (req, res) => {
  const { id } = req.params;
  const subPath = req.body.path || '';
  const file = req.file;
  
  if (!file) return res.status(400).json({ error: 'No file uploaded' });
  
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    const targetDir = path.join(s.path, subPath);
    if (!targetDir.startsWith(s.path)) throw new Error('Access denied');
    
    if (!fs.existsSync(targetDir)) {
      fs.mkdirSync(targetDir, { recursive: true });
    }
    
    const targetFilePath = path.join(targetDir, file.originalname);
    fs.copyFileSync(file.path, targetFilePath);
    fs.unlinkSync(file.path); // cleanup temp file
    
    res.json({ success: true, file: file.originalname });
  } catch (e) {
    if (fs.existsSync(file.path)) fs.unlinkSync(file.path);
    res.status(400).json({ error: e.message });
  }
});

// Upload World (Aternos Style)
app.post('/api/servers/:id/files/upload-world', upload.single('file'), async (req, res) => {
  const { id } = req.params;
  const file = req.file;
  if (!file) return res.status(400).json({ error: 'No file uploaded' });
  
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    // 1. Delete old world folders
    const worldsToDelete = ['world', 'world_nether', 'world_the_end'];
    for (const w of worldsToDelete) {
      const wPath = path.join(s.path, w);
      if (fs.existsSync(wPath)) fs.rmSync(wPath, { recursive: true, force: true });
    }

    // 2. Copy zip to server path
    const targetZip = path.join(s.path, 'temp_world_upload.zip');
    fs.copyFileSync(file.path, targetZip);
    fs.unlinkSync(file.path);

    // 3. Extract and delete zip
    extractZip(s.path, 'temp_world_upload.zip', '');
    fs.unlinkSync(targetZip);
    
    // 4. If there is no 'world' folder, but a custom folder got extracted containing level.dat, rename it to 'world'
    if (!fs.existsSync(path.join(s.path, 'world'))) {
       const items = fs.readdirSync(s.path);
       for (const item of items) {
          const itemPath = path.join(s.path, item);
          if (fs.statSync(itemPath).isDirectory() && fs.existsSync(path.join(itemPath, 'level.dat'))) {
             fs.renameSync(itemPath, path.join(s.path, 'world'));
             break;
          }
       }
    }

    res.json({ success: true });
  } catch (e) {
    if (fs.existsSync(file.path)) fs.unlinkSync(file.path);
    res.status(400).json({ error: e.message });
  }
});

// Upload Plugin
app.post('/api/servers/:id/files/upload-plugin', upload.single('file'), async (req, res) => {
  const { id } = req.params;
  const file = req.file;
  if (!file) return res.status(400).json({ error: 'No file uploaded' });
  
  const s = getServers().find(s => s.id === id);
  if (!s) return res.status(404).json({ error: 'Server not found' });
  
  try {
    const pluginsDir = path.join(s.path, 'plugins');
    if (!fs.existsSync(pluginsDir)) fs.mkdirSync(pluginsDir, { recursive: true });
    
    const targetFilePath = path.join(pluginsDir, file.originalname);
    fs.copyFileSync(file.path, targetFilePath);
    fs.unlinkSync(file.path);
    
    res.json({ success: true, file: file.originalname });

    // ── Instantly backup after manual upload so plugins survive container restart ──
    setImmediate(async () => {
      try {
        appendLog(id, `[BACKUP] 💾 Saving plugins to cloud...`);
        await backupPluginsOnly(id, s.path, (sid, log) => appendLog(sid, log));
      } catch (e) {
        appendLog(id, `[BACKUP] ⚠️ Plugin cloud save failed: ${e.message}`);
      }
    });
  } catch (e) {
    if (fs.existsSync(file.path)) fs.unlinkSync(file.path);
    res.status(400).json({ error: e.message });
  }
});

  // --- WebSocket Gateway Connection Handler ---
wss.on('connection', async (ws, req) => {
  try {
    const parsedUrl = new URL(req.url, 'http://localhost');
    const token = parsedUrl.searchParams.get('token');
    
    // Use the same deterministic token logic as HTTP routes
    const config = await getAuthConfig();
    if (!token || !config || !config.passwordHash) {
      ws.close(4001, 'Unauthorized');
      return;
    }
    const expectedToken = generateStableToken(config.passwordHash, config.salt);
    if (token !== expectedToken) {
      ws.close(4001, 'Unauthorized');
      return;
    }
  } catch (e) {
    ws.close(4000, 'Invalid Request');
    return;
  }

  // Client messages
  ws.on('message', (messageText) => {
    try {
      const msg = JSON.parse(messageText);
      
      if (msg.type === 'subscribe') {
        const serverId = msg.serverId;
        subscriptions.set(ws, serverId);
        
        // Push backlog history
        const history = logHistory.get(serverId) || [];
        ws.send(JSON.stringify({ type: 'backlog', data: history }));
        
        // Push current status and players
        const isRunning = processManager.isRunning(serverId);
        const procInfo = processManager.processes.get(serverId);
        
        ws.send(JSON.stringify({
          type: 'status',
          data: isRunning ? procInfo.status : 'offline'
        }));
        
        ws.send(JSON.stringify({
          type: 'players',
          data: isRunning ? Array.from(procInfo.players) : []
        }));
      }
      
      if (msg.type === 'command') {
        const serverId = subscriptions.get(ws);
        if (serverId && msg.data) {
          // Minecraft console commands should not have a leading slash
          let cmd = msg.data.trim();
          if (cmd.startsWith('/')) {
            cmd = cmd.substring(1);
          }
          processManager.sendCommand(serverId, cmd);
        }
      }
    } catch (e) {
      console.error('WS parsing error:', e);
    }
  });

  ws.on('close', () => {
    subscriptions.delete(ws);
  });
});

// Serve compiled build assets if built, or direct homepage route
app.use(express.static(path.join(__dirname, 'dist')));
app.get('*', (req, res) => {
  if (fs.existsSync(path.join(__dirname, 'dist', 'index.html'))) {
    res.sendFile(path.join(__dirname, 'dist', 'index.html'));
  } else {
    res.send('Vite Dev Server is running. Visit port 3000 to access the page.');
  }
});

// Start server after initial Firestore sync
async function start() {
  await syncFromFirestore();
  await autoRecoverServers();
  server.listen(PORT, '0.0.0.0', () => {
    console.log(`Minecraft Hoster Backend API listening on http://0.0.0.0:${PORT}`);
    console.log(`WebSocket server is running on ws://0.0.0.0:${PORT}`);
  });
}
start();