import 'dotenv/config';
import express, { Request, Response, NextFunction } from 'express';
import path from 'path';
import { createServer as createViteServer } from 'vite';
import bcrypt from 'bcryptjs';
import jwt from 'jsonwebtoken';
import { ConfidentialClientApplication } from '@azure/msal-node';
import db, { getSetting, setSetting, getAllSettings } from './server-db';
import { Device, LabTemplate, Booking, LogEntry, User, QuickLink } from './src/types';

const uid = (prefix: string) => `${prefix}-${Date.now()}-${Math.random().toString(36).slice(2, 7)}`;

const JWT_SECRET = process.env.JWT_SECRET || 'ghostgrid-dev-secret-change-in-production';
const JWT_EXPIRY = '24h';

interface JwtPayload {
  userId: string;
  email: string;
}

declare global {
  namespace Express {
    interface Request {
      user?: JwtPayload;
    }
  }
}

function requireAuth(req: Request, res: Response, next: NextFunction) {
  const authHeader = req.headers['authorization'];
  const token = authHeader?.split(' ')[1];
  if (!token) {
    res.status(401).json({ error: 'Authentication required.' });
    return;
  }
  try {
    const payload = jwt.verify(token, JWT_SECRET) as JwtPayload;
    req.user = payload;
    next();
  } catch {
    res.status(401).json({ error: 'Invalid or expired token.' });
  }
}

function requireAdmin(req: Request, res: Response, next: NextFunction) {
  const row = db.prepare('SELECT role FROM users WHERE id = ?').get(req.user!.userId) as { role: string } | undefined;
  if (!row || row.role.toLowerCase() !== 'admin') {
    res.status(403).json({ error: 'Admin access required.' });
    return;
  }
  next();
}

function getMsalClient(): ConfidentialClientApplication | null {
  const clientId = getSetting('azure_client_id');
  const tenantId = getSetting('azure_tenant_id');
  const secret = getSetting('azure_client_secret');
  if (getSetting('azure_enabled') !== 'true' || !clientId || !tenantId || !secret) return null;
  return new ConfidentialClientApplication({
    auth: { clientId, authority: `https://login.microsoftonline.com/${tenantId}`, clientSecret: secret },
  });
}

const SECRET_KEYS = ['azure_client_secret', 'checkmk_api_secret'];

function maskSettings(raw: Record<string, string>): Record<string, string> {
  const out = { ...raw };
  for (const k of SECRET_KEYS) {
    if (out[k]) out[k] = '__SET__';
  }
  return out;
}

async function startServer() {
  const app = express();
  const PORT = Number(process.env.PORT) || 3000;

  app.use(express.json());

  // -------------------------------------------------------------
  // AUTH API
  // -------------------------------------------------------------
  app.post('/api/auth/register', (req, res) => {
    try {
      const { name, email, password } = req.body;
      if (!name || !email || !password) {
        return res.status(400).json({ error: 'Name, email and password are required.' });
      }
      if (password.length < 8) {
        return res.status(400).json({ error: 'Password must be at least 8 characters.' });
      }

      const existing = db.prepare('SELECT id FROM users WHERE email = ?').get(email);
      if (existing) {
        return res.status(409).json({ error: 'An account with this email already exists.' });
      }

      const passwordHash = bcrypt.hashSync(password, 10);
      const id = uid("u");

      db.prepare('INSERT INTO users (id, name, role, email, password_hash) VALUES (?, ?, ?, ?, ?)')
        .run(id, name, 'User', email, passwordHash);

      const user = db.prepare('SELECT id, name, role, email FROM users WHERE id = ?').get(id) as User;
      const token = jwt.sign({ userId: id, email }, JWT_SECRET, { expiresIn: JWT_EXPIRY });

      res.status(201).json({ token, user });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/auth/login', (req, res) => {
    try {
      const { email, password } = req.body;
      if (!email || !password) {
        return res.status(400).json({ error: 'Email and password are required.' });
      }

      const row = db.prepare('SELECT * FROM users WHERE email = ?').get(email) as (User & { password_hash: string }) | undefined;
      if (!row || !bcrypt.compareSync(password, row.password_hash)) {
        return res.status(401).json({ error: 'Invalid email or password.' });
      }

      const token = jwt.sign({ userId: row.id, email: row.email }, JWT_SECRET, { expiresIn: JWT_EXPIRY });
      const user: User = { id: row.id, name: row.name, role: row.role, email: row.email };

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'system', `${row.name} logged in.`, null, row.id);

      res.json({ token, user });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.get('/api/auth/me', requireAuth, (req, res) => {
    try {
      const user = db.prepare('SELECT id, name, role, email FROM users WHERE id = ?').get(req.user!.userId) as User | undefined;
      if (!user) {
        return res.status(404).json({ error: 'User not found.' });
      }
      res.json(user);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // Public: frontend checks this before rendering the Azure login button
  app.get('/api/auth/config', (_req, res) => {
    const enabled = getSetting('azure_enabled') === 'true';
    const clientId = getSetting('azure_client_id');
    const tenantId = getSetting('azure_tenant_id');
    const secret = getSetting('azure_client_secret');
    const appUrl = process.env.APP_URL || `http://localhost:${PORT}`;
    const effectiveRedirectUri = getSetting('azure_redirect_uri') || `${appUrl}/api/auth/azure/callback`;
    res.json({
      azureEnabled: enabled && Boolean(clientId) && Boolean(tenantId) && Boolean(secret),
      effectiveRedirectUri,
      checkmkEnabled: getSetting('checkmk_enabled') === 'true',
    });
  });

  // Start Azure OAuth flow
  app.get('/api/auth/azure', async (_req, res) => {
    const msalClient = getMsalClient();
    if (!msalClient) {
      return res.redirect('/?auth_error=Azure+login+not+configured');
    }
    const appUrl = process.env.APP_URL || `http://localhost:${PORT}`;
    const redirectUri = getSetting('azure_redirect_uri') || `${appUrl}/api/auth/azure/callback`;
    try {
      const authCodeUrl = await msalClient.getAuthCodeUrl({
        scopes: ['openid', 'profile', 'email'],
        redirectUri,
      });
      res.redirect(authCodeUrl);
    } catch (err: any) {
      console.error('[Azure Auth] getAuthCodeUrl error:', err);
      res.redirect('/?auth_error=Failed+to+start+Microsoft+login');
    }
  });

  // Azure OAuth callback
  app.get('/api/auth/azure/callback', async (req, res) => {
    const { code, error, error_description } = req.query;
    if (error) {
      const msg = encodeURIComponent(String(error_description || error));
      return res.redirect(`/?auth_error=${msg}`);
    }
    if (!code) {
      return res.redirect('/?auth_error=No+authorization+code+received');
    }
    const msalClient = getMsalClient();
    if (!msalClient) {
      return res.redirect('/?auth_error=Azure+login+not+configured');
    }
    const appUrl = process.env.APP_URL || `http://localhost:${PORT}`;
    const redirectUri = getSetting('azure_redirect_uri') || `${appUrl}/api/auth/azure/callback`;
    try {
      const result = await msalClient.acquireTokenByCode({
        code: String(code),
        scopes: ['openid', 'profile', 'email'],
        redirectUri,
      });
      const email = (result.account?.username ?? '').toLowerCase();
      const name = result.account?.name || email;
      if (!email) {
        return res.redirect('/?auth_error=No+email+returned+by+Microsoft');
      }
      const allowedGroup = getSetting('azure_allowed_group');
      if (allowedGroup) {
        const claims = result.idTokenClaims as { groups?: string[] } | undefined;
        if (!claims?.groups?.includes(allowedGroup)) {
          return res.redirect('/?auth_error=Not+a+member+of+the+required+group');
        }
      }
      let user = db.prepare('SELECT id, name, role, email FROM users WHERE email = ?').get(email) as User | undefined;
      if (!user) {
        const id = uid("u");
        db.prepare('INSERT INTO users (id, name, role, email, password_hash) VALUES (?, ?, ?, ?, ?)')
          .run(id, name, 'User', email, '');
        user = db.prepare('SELECT id, name, role, email FROM users WHERE id = ?').get(id) as User;
      }
      const token = jwt.sign({ userId: user.id, email: user.email }, JWT_SECRET, { expiresIn: JWT_EXPIRY });
      res.redirect(`/?token=${encodeURIComponent(token)}`);
    } catch (err: any) {
      console.error('[Azure Auth] acquireTokenByCode error:', err);
      res.redirect('/?auth_error=Authentication+failed');
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Settings (admin only)
  // -------------------------------------------------------------
  app.get('/api/settings', requireAuth, (_req, res) => {
    try {
      res.json(maskSettings(getAllSettings()));
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/settings', requireAuth, (req, res) => {
    try {
      const allowed = ['azure_enabled', 'azure_client_id', 'azure_tenant_id', 'azure_client_secret',
        'azure_redirect_uri', 'checkmk_enabled', 'checkmk_api_url', 'checkmk_api_user', 'checkmk_api_secret', 'checkmk_sync_interval_ms'];
      const updates = req.body as Record<string, string>;
      for (const key of allowed) {
        if (key in updates && updates[key] !== '__SET__') {
          setSetting(key, String(updates[key]));
        }
      }
      res.json(maskSettings(getAllSettings()));
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Users
  // -------------------------------------------------------------
  app.get('/api/users', requireAuth, (_req, res) => {
    try {
      const users = db.prepare('SELECT id, name, role, email FROM users').all() as User[];
      res.json(users);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/users/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const { name, email } = req.body as { name?: string; email?: string };
      if (!name && !email) return res.status(400).json({ error: 'Nothing to update.' });
      const existing = db.prepare('SELECT id, name, email FROM users WHERE id = ?').get(id) as User | undefined;
      if (!existing) return res.status(404).json({ error: 'User not found.' });
      if (email && email !== existing.email) {
        const dupe = db.prepare('SELECT id FROM users WHERE email = ? AND id != ?').get(email, id);
        if (dupe) return res.status(409).json({ error: 'Email already in use.' });
      }
      db.prepare('UPDATE users SET name = COALESCE(?, name), email = COALESCE(?, email) WHERE id = ?')
        .run(name ?? null, email ?? null, id);
      const updated = db.prepare('SELECT id, name, role, email FROM users WHERE id = ?').get(id) as User;
      res.json(updated);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.delete('/api/users/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      if (id === req.user!.userId) return res.status(400).json({ error: 'You cannot delete your own account.' });
      const existing = db.prepare('SELECT id FROM users WHERE id = ?').get(id);
      if (!existing) return res.status(404).json({ error: 'User not found.' });
      const count = (db.prepare('SELECT COUNT(*) as n FROM users').get() as { n: number }).n;
      if (count <= 1) return res.status(400).json({ error: 'Cannot delete the last user.' });
      db.prepare('DELETE FROM users WHERE id = ?').run(id);
      res.json({ success: true });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Devices / Inventory
  // -------------------------------------------------------------
  app.get('/api/devices', requireAuth, (_req, res) => {
    try {
      const devices = db.prepare('SELECT * FROM devices').all() as Device[];
      res.json(devices);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/devices', requireAuth, (req, res) => {
    try {
      const { hostname, ip, location, notes, type, status, emergencySheet, lastCheckedAt } = req.body;
      if (!hostname || !ip || !type) {
        return res.status(400).json({ error: 'Missing required device specifications.' });
      }

      const id = uid("dev");
      db.prepare(`
        INSERT INTO devices (id, hostname, ip, location, notes, type, status, emergencySheet, lastCheckedAt)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
      `).run(id, hostname, ip, location || '', notes || '', type, status || 'unknown', emergencySheet || '', lastCheckedAt || null);

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'maintenance',
          `Provisioned a new host candidate "${hostname}" (${ip}) inside location ${location || 'Inventory'}.`,
          id, req.user!.userId);

      const device = db.prepare('SELECT * FROM devices WHERE id = ?').get(id) as Device;
      res.status(201).json(device);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/devices/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const { hostname, ip, location, notes, type, status, emergencySheet, lastCheckedAt, operatorName } = req.body;

      db.prepare(`
        UPDATE devices SET hostname = ?, ip = ?, location = ?, notes = ?, type = ?, status = ?, emergencySheet = ?, lastCheckedAt = ?
        WHERE id = ?
      `).run(hostname, ip, location, notes, type, status, emergencySheet, lastCheckedAt ?? null, id);

      const logId = uid("log");
      const operatorText = operatorName ? `${operatorName} finished ` : 'Updated ';
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'maintenance',
          `${operatorText}refining the device specifications for "${hostname}".`, id, req.user!.userId);

      const device = db.prepare('SELECT * FROM devices WHERE id = ?').get(id) as Device;
      res.json(device);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.delete('/api/devices/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const dev = db.prepare('SELECT * FROM devices WHERE id = ?').get(id) as Device;
      if (!dev) return res.status(404).json({ error: 'Device not found.' });

      db.prepare('DELETE FROM devices WHERE id = ?').run(id);

      const labs = db.prepare('SELECT * FROM labs').all() as any[];
      const updateLabStmt = db.prepare('UPDATE labs SET deviceIds = ?, topology = ? WHERE id = ?');
      for (const lab of labs) {
        const deviceIds: string[] = JSON.parse(lab.deviceIds);
        const topology: any[] = JSON.parse(lab.topology);
        updateLabStmt.run(
          JSON.stringify(deviceIds.filter(dId => dId !== id)),
          JSON.stringify(topology.filter(t => t.fromDevice !== id && t.toDevice !== id)),
          lab.id
        );
      }

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'maintenance',
          `Permanently removed the host device "${dev.hostname || id}" from the inventory records.`,
          null, req.user!.userId);

      res.json({ success: true, message: 'Device deleted successfully and cleaned from topologies.' });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Lab Templates
  // -------------------------------------------------------------
  app.get('/api/labs', requireAuth, (_req, res) => {
    try {
      const rows = db.prepare('SELECT * FROM labs').all() as any[];
      const labs: LabTemplate[] = rows.map(r => ({
        id: r.id, name: r.name, description: r.description,
        contactPerson: r.contactPerson, location: r.location,
        deviceIds: JSON.parse(r.deviceIds), topology: JSON.parse(r.topology)
      }));
      res.json(labs);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/labs', requireAuth, (req, res) => {
    try {
      const { name, description, contactPerson, location, deviceIds, topology } = req.body;
      if (!name || !deviceIds || !Array.isArray(deviceIds)) {
        return res.status(400).json({ error: 'Missing name or associated device configurations.' });
      }

      const id = uid("lab");
      db.prepare(`INSERT INTO labs (id, name, description, contactPerson, location, deviceIds, topology) VALUES (?, ?, ?, ?, ?, ?, ?)`)
        .run(id, name, description || '', contactPerson || '', location || '', JSON.stringify(deviceIds), JSON.stringify(topology || []));

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'maintenance',
          `Released a new lab template profile "${name}" (${location || 'Staging Area'}) for engineering teams.`,
          req.user!.userId);

      const r = db.prepare('SELECT * FROM labs WHERE id = ?').get(id) as any;
      res.status(201).json({ id: r.id, name: r.name, description: r.description, contactPerson: r.contactPerson, location: r.location, deviceIds: JSON.parse(r.deviceIds), topology: JSON.parse(r.topology) });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/labs/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const { name, description, contactPerson, location, deviceIds, topology } = req.body;

      db.prepare(`UPDATE labs SET name = ?, description = ?, contactPerson = ?, location = ?, deviceIds = ?, topology = ? WHERE id = ?`)
        .run(name, description, contactPerson, location, JSON.stringify(deviceIds), JSON.stringify(topology), id);

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'maintenance',
          `Modified the active topology mapping schema for the "${name}" lab template.`, req.user!.userId);

      const r = db.prepare('SELECT * FROM labs WHERE id = ?').get(id) as any;
      res.json({ id: r.id, name: r.name, description: r.description, contactPerson: r.contactPerson, location: r.location, deviceIds: JSON.parse(r.deviceIds), topology: JSON.parse(r.topology) });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.delete('/api/labs/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const lab = db.prepare('SELECT * FROM labs WHERE id = ?').get(id) as any;
      if (!lab) return res.status(404).json({ error: 'Lab template not found.' });

      db.prepare('DELETE FROM labs WHERE id = ?').run(id);
      db.prepare(`UPDATE bookings SET status = 'cancelled' WHERE labId = ? AND status = 'upcoming'`).run(id);

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'booking',
          `Withdrew the lab testing template "${lab.name || id}".`, req.user!.userId);

      res.json({ success: true, message: 'Lab template deleted and future reservations cancelled.' });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Bookings / Reservations
  // -------------------------------------------------------------
  app.get('/api/bookings', requireAuth, (_req, res) => {
    try {
      const rows = db.prepare('SELECT * FROM bookings').all() as any[];
      const bookings: Booking[] = rows.map(r => ({
        id: r.id, labId: r.labId, userId: r.userId,
        startDateTime: r.startDateTime, endDateTime: r.endDateTime,
        notes: r.notes || '', status: r.status as any,
        notified: r.notified === 1, emailSent: r.emailSent === 1
      }));
      res.json(bookings);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/bookings', requireAuth, (req, res) => {
    try {
      const { labId, userId, startDateTime, endDateTime, notes, status, operatorName } = req.body;
      if (!labId || !userId || !startDateTime || !endDateTime) {
        return res.status(400).json({ error: 'Missing reservation timestamps or laboratory ID.' });
      }

      const id = uid("book");
      db.prepare(`INSERT INTO bookings (id, labId, userId, startDateTime, endDateTime, notes, status, notified, emailSent) VALUES (?, ?, ?, ?, ?, ?, ?, 0, 1)`)
        .run(id, labId, userId, startDateTime, endDateTime, notes || '', status || 'upcoming');

      const lab = db.prepare('SELECT name FROM labs WHERE id = ?').get(labId) as { name: string } | undefined;
      const logId = uid("log");
      const operatorText = operatorName || 'An operator';
      const startF = new Date(startDateTime).toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit' });
      const endF = new Date(endDateTime).toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit' });

      db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'booking',
          `${operatorText} booked the lab template "${lab?.name || 'Unknown'}" from ${startF} to ${endF}.`, userId);

      const r = db.prepare('SELECT * FROM bookings WHERE id = ?').get(id) as any;
      res.status(201).json({
        booking: { id: r.id, labId: r.labId, userId: r.userId, startDateTime: r.startDateTime, endDateTime: r.endDateTime, notes: r.notes || '', status: r.status, notified: r.notified === 1, emailSent: r.emailSent === 1 },
        alertGenerated: `Reservation successfully approved: Lab "${lab?.name || 'Scenario'}" is reserved for your exclusive usage during this window.`
      });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/bookings/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const { status, operatorName } = req.body;

      const booking = db.prepare('SELECT * FROM bookings WHERE id = ?').get(id) as any;
      if (!booking) return res.status(404).json({ error: 'Reservation not found.' });

      db.prepare('UPDATE bookings SET status = ? WHERE id = ?').run(status, id);

      if (status === 'cancelled') {
        const lab = db.prepare('SELECT name FROM labs WHERE id = ?').get(booking.labId) as { name: string } | undefined;
        const logId = uid("log");
        db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
          .run(logId, new Date().toISOString(), 'booking',
            `${operatorName || 'An operator'} canceled the reservation for lab template "${lab?.name || 'Unknown'}" and released associated nodes back into the pool.`,
            req.user!.userId);
      }

      const r = db.prepare('SELECT * FROM bookings WHERE id = ?').get(id) as any;
      res.json({ id: r.id, labId: r.labId, userId: r.userId, startDateTime: r.startDateTime, endDateTime: r.endDateTime, notes: r.notes || '', status: r.status, notified: r.notified === 1, emailSent: r.emailSent === 1 });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.delete('/api/bookings/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const booking = db.prepare('SELECT * FROM bookings WHERE id = ?').get(id) as any;
      if (!booking) return res.status(404).json({ error: 'Reservation not found.' });

      db.prepare('DELETE FROM bookings WHERE id = ?').run(id);
      const lab = db.prepare('SELECT name FROM labs WHERE id = ?').get(booking.labId) as { name: string } | undefined;

      const logId = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, userId) VALUES (?, ?, ?, ?, ?)`)
        .run(logId, new Date().toISOString(), 'booking',
          `Permanently deleted the reservation records for lab "${lab?.name || 'Unknown'}".`, req.user!.userId);

      res.json({ success: true, message: 'Reservation and its logs have been resolved correctly.' });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Logs
  // -------------------------------------------------------------
  app.get('/api/logs', requireAuth, (_req, res) => {
    try {
      const logs = db.prepare('SELECT * FROM logs ORDER BY timestamp DESC').all() as LogEntry[];
      res.json(logs);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/logs', requireAuth, (req, res) => {
    try {
      const { type, message, deviceId, userId } = req.body;
      if (!message || !type) {
        return res.status(400).json({ error: 'Missing log message or classification type.' });
      }

      const id = uid("log");
      db.prepare(`INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)`)
        .run(id, new Date().toISOString(), type, message, deviceId || null, userId || null);

      const log = db.prepare('SELECT * FROM logs WHERE id = ?').get(id) as LogEntry;
      res.status(201).json(log);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // RESTFUL API: Quick Links (shared link dashboard)
  // -------------------------------------------------------------
  app.get('/api/links', requireAuth, (_req, res) => {
    try {
      const links = db.prepare('SELECT * FROM links ORDER BY category ASC, title ASC').all() as QuickLink[];
      res.json(links);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.post('/api/links', requireAuth, (req, res) => {
    try {
      const { title, url, description, category, color } = req.body;
      if (!title || !url) {
        return res.status(400).json({ error: 'A title and a URL are required.' });
      }

      const id = uid("link");
      const createdAt = new Date().toISOString();
      db.prepare(`INSERT INTO links (id, title, url, description, category, color, createdBy, createdAt) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`)
        .run(id, title, url, description || '', category || '', color || 'emerald', req.user!.userId, createdAt);

      const link = db.prepare('SELECT * FROM links WHERE id = ?').get(id) as QuickLink;
      res.status(201).json(link);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.put('/api/links/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const { title, url, description, category, color } = req.body;
      const existing = db.prepare('SELECT id FROM links WHERE id = ?').get(id);
      if (!existing) return res.status(404).json({ error: 'Link not found.' });

      db.prepare(`UPDATE links SET title = ?, url = ?, description = ?, category = ?, color = ? WHERE id = ?`)
        .run(title, url, description || '', category || '', color || 'emerald', id);

      const link = db.prepare('SELECT * FROM links WHERE id = ?').get(id) as QuickLink;
      res.json(link);
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.delete('/api/links/:id', requireAuth, (req, res) => {
    try {
      const id = req.params.id;
      const existing = db.prepare('SELECT id FROM links WHERE id = ?').get(id);
      if (!existing) return res.status(404).json({ error: 'Link not found.' });

      db.prepare('DELETE FROM links WHERE id = ?').run(id);
      res.json({ success: true, message: 'Link removed from the shared dashboard.' });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  // -------------------------------------------------------------
  // VITE / STATIC SERVING
  // -------------------------------------------------------------
  if (process.env.NODE_ENV !== 'production') {
    const vite = await createViteServer({
      server: { middlewareMode: true },
      appType: 'spa',
    });
    app.use(vite.middlewares);
  } else {
    const distPath = path.join(process.cwd(), 'dist');
    app.use(express.static(distPath));
    app.get('*', (_req, res) => {
      res.sendFile(path.join(distPath, 'index.html'));
    });
  }

  // -------------------------------------------------------------
  // CYCLIC CHECKMK STATUS SYNC
  // Looks up each device by IP address in CheckMK's host_config collection,
  // then fetches the monitoring state. Devices not found in CheckMK are reset
  // to 'unknown'. Runs on a self-scheduling setTimeout so that interval changes
  // in Settings take effect on the next cycle without a server restart.
  // -------------------------------------------------------------
  function checkmkHttpHint(status: number): string {
    if (status === 401) return 'HTTP 401 Unauthorized — wrong automation user or secret (check Settings → CheckMK)';
    if (status === 403) return 'HTTP 403 Forbidden — automation user lacks permission in CheckMK';
    if (status === 404) return 'HTTP 404 Not Found — API URL incorrect or site name wrong';
    return `HTTP ${status}`;
  }

  async function syncCheckMkStatuses() {
    const now = new Date().toISOString();

    if (getSetting('checkmk_enabled') !== 'true') return;

    const CHECKMK_API_URL = getSetting('checkmk_api_url') || process.env.CHECKMK_API_URL;
    const CHECKMK_API_USER = getSetting('checkmk_api_user') || process.env.CHECKMK_API_USER || 'automation';
    const CHECKMK_API_SECRET = getSetting('checkmk_api_secret') || process.env.CHECKMK_API_SECRET;

    if (!CHECKMK_API_URL || !CHECKMK_API_SECRET) {
      db.prepare('INSERT INTO logs (id, timestamp, type, message) VALUES (?, ?, ?, ?)')
        .run(uid('log'), now, 'system', 'CheckMK sync skipped — API URL or secret not configured. Check Settings.');
      return;
    }

    const authHeader = `Bearer ${CHECKMK_API_USER} ${CHECKMK_API_SECRET}`;
    const headers = { Authorization: authHeader, Accept: 'application/json' };

    // Step 1: build IP → hostname map from host configuration
    // Checks both attributes (explicitly set) and effective_attributes (inherited).
    let ipToHostname: Map<string, string>;
    try {
      const cfgRes = await fetch(
        `${CHECKMK_API_URL}/domain-types/host_config/collections/all`,
        { headers }
      );
      if (!cfgRes.ok) throw new Error(checkmkHttpHint(cfgRes.status));
      const cfgData = await cfgRes.json();
      ipToHostname = new Map<string, string>();
      for (const host of cfgData?.value ?? []) {
        const ext = host?.extensions;
        const ip: string | undefined =
          ext?.attributes?.ipaddress || ext?.effective_attributes?.ipaddress;
        const name: string | undefined = host?.id;
        if (ip && name) ipToHostname.set(ip, name);
      }
    } catch (err: any) {
      const msg = `CheckMK sync failed — could not fetch host list: ${err?.message ?? err}`;
      console.error('[CheckMK]', msg);
      db.prepare('INSERT INTO logs (id, timestamp, type, message) VALUES (?, ?, ?, ?)')
        .run(uid('log'), now, 'system', msg);
      return;
    }

    // Step 2: for each device, look up its CheckMK hostname by IP, then query the
    // individual monitoring object at /objects/host/{name} for the live state.
    // The collection endpoint (/domain-types/host/collections/all) only returns
    // minimal fields without state, so per-host calls are required.
    const rows = db.prepare('SELECT id, hostname, ip, status FROM devices').all() as { id: string; hostname: string; ip: string; status: string }[];
    const counts = { online: 0, offline: 0, unknown: 0 };
    let loggedFirstExtensions = false;

    for (const dev of rows) {
      const cmkHost = ipToHostname.get(dev.ip);
      if (!cmkHost) {
        if (dev.status !== 'unknown') {
          db.prepare('UPDATE devices SET status = ?, lastCheckedAt = ? WHERE id = ?').run('unknown', now, dev.id);
          db.prepare('INSERT INTO logs (id, timestamp, type, message, deviceId) VALUES (?, ?, ?, ?, ?)')
            .run(uid('log'), now, 'status', `CheckMK: ${dev.hostname} (${dev.ip}) not found in monitoring — status set to unknown.`, dev.id);
        }
        counts.unknown++;
        continue;
      }
      try {
        const hostRes = await fetch(
          `${CHECKMK_API_URL}/objects/host/${encodeURIComponent(cmkHost)}`,
          { headers }
        );
        if (!hostRes.ok) throw new Error(checkmkHttpHint(hostRes.status));
        const hostData = await hostRes.json();

        // Log raw extensions once so the state field path can be verified.
        if (!loggedFirstExtensions) {
          loggedFirstExtensions = true;
          db.prepare('INSERT INTO logs (id, timestamp, type, message) VALUES (?, ?, ?, ?)')
            .run(uid('log'), now, 'system',
              `CheckMK per-host raw extensions for "${cmkHost}": ${JSON.stringify(hostData?.extensions ?? hostData).substring(0, 400)}`);
        }

        const state: number = hostData?.extensions?.state ?? -1;
        const newStatus = state === 0 ? 'online' : state === 1 || state === 2 ? 'offline' : 'unknown';
        db.prepare('UPDATE devices SET status = ?, lastCheckedAt = ? WHERE id = ?').run(newStatus, now, dev.id);
        if (dev.status !== newStatus) {
          db.prepare('INSERT INTO logs (id, timestamp, type, message, deviceId) VALUES (?, ?, ?, ?, ?)')
            .run(uid('log'), now, 'status', `CheckMK: ${dev.hostname} (${dev.ip}) status changed to ${newStatus} (was: ${dev.status}).`, dev.id);
        }
        counts[newStatus as 'online' | 'offline' | 'unknown']++;
      } catch (err: any) {
        const msg = `CheckMK: status sync failed for ${dev.hostname} (${dev.ip}) — ${err?.message ?? err}`;
        console.error('[CheckMK]', msg);
        db.prepare('INSERT INTO logs (id, timestamp, type, message, deviceId) VALUES (?, ?, ?, ?, ?)')
          .run(uid('log'), now, 'system', msg, dev.id);
        counts.unknown++;
      }
    }

    db.prepare('INSERT INTO logs (id, timestamp, type, message) VALUES (?, ?, ?, ?)')
      .run(uid('log'), now, 'system',
        `CheckMK sync completed — ${counts.online} online, ${counts.offline} offline, ${counts.unknown} unknown (${rows.length} devices total).`);
  }

  async function scheduleSync() {
    await syncCheckMkStatuses();
    const ms = Number(getSetting('checkmk_sync_interval_ms')) || 60_000;
    setTimeout(scheduleSync, ms);
  }
  scheduleSync();

  app.post('/api/checkmk/sync', requireAuth, async (_req, res) => {
    try {
      await syncCheckMkStatuses();
      res.json({ ok: true });
    } catch (err: any) {
      res.status(500).json({ error: err.message });
    }
  });

  app.listen(PORT, '0.0.0.0', () => {
    console.log(`[Server] Core Server running at http://0.0.0.0:${PORT}`);
  });
}

startServer().catch(err => {
  console.error('[Server] Critical Crash during bootstrap:', err);
});