const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
const { pool, initDb } = require('./db');
const { v4: uuidv4 } = require('uuid');
const nodemailer = require('nodemailer');

const app = express();
const PORT = process.env.PORT || 3001;
const JWT_SECRET = process.env.JWT_SECRET || 'dev_secret_key_123';

app.use(cors());
// Increased limit to support base64 file uploads for tickets
app.use(bodyParser.json({ limit: '50mb' }));
app.use(bodyParser.urlencoded({ limit: '50mb', extended: true }));

// --- EMAIL HELPERS ---

async function getTransporter() {
    const [settings] = await pool.query('SELECT smtp_config FROM settings WHERE id = 1');
    if (!settings.length || !settings[0].smtp_config) return null;

    const config = settings[0].smtp_config;
    if (!config.host || !config.user || !config.pass) return null;

    return {
        transporter: nodemailer.createTransport({
            host: config.host,
            port: config.port,
            secure: config.secure,
            auth: { user: config.user, pass: config.pass },
        }),
        from: config.fromEmail || config.user
    };
}

async function sendEmailToUsers(subject, body) {
  try {
    const setup = await getTransporter();
    if (!setup) return;

    const [users] = await pool.query('SELECT email FROM users WHERE receive_alerts = TRUE AND email IS NOT NULL AND email != ""');
    if (users.length === 0) return;
    const bccList = users.map(u => u.email).join(',');

    await setup.transporter.sendMail({
      from: setup.from,
      bcc: bccList,
      subject: subject,
      text: body,
    });
  } catch (error) { console.error('Email error:', error.message); }
}

async function sendDirectEmail(to, subject, body) {
    try {
        const setup = await getTransporter();
        if (!setup) return;
        
        await setup.transporter.sendMail({
            from: setup.from,
            to: to,
            subject: subject,
            text: body
        });
        console.log(`Direct email sent to ${to}`);
    } catch (error) { console.error('Direct Email error:', error.message); }
}

// --- MIDDLEWARE ---
const authenticateToken = (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];
  
  if (!token) return res.sendStatus(401);

  jwt.verify(token, JWT_SECRET, (err, user) => {
    // Return 401 for token errors (expired/invalid) to trigger frontend logout
    if (err) {
        console.error("Token verification failed:", err.message);
        return res.sendStatus(401); 
    }
    req.user = user;
    next();
  });
};

const requireAdmin = (req, res, next) => {
  if (req.user && req.user.role === 'admin') {
      next();
  } else {
      console.warn(`Access denied for user ${req.user?.email} with role ${req.user?.role}`);
      res.status(403).json({ message: 'Access denied: Admins only' });
  }
};

// --- AUTH ---
app.post('/api/auth/login', async (req, res) => {
  const { email, password } = req.body;
  try {
    const [users] = await pool.query('SELECT * FROM users WHERE email = ?', [email]);
    if (users.length === 0) return res.status(401).json({ message: 'Invalid credentials' });
    const user = users[0];
    const validPassword = await bcrypt.compare(password, user.password_hash);
    if (!validPassword) return res.status(401).json({ message: 'Invalid credentials' });

    // Ensure role is captured correctly from DB
    const token = jwt.sign(
      { id: user.id, email: user.email, role: user.role, familyId: user.family_id },
      JWT_SECRET, { expiresIn: '24h' }
    );
    res.json({
      token,
      user: { id: user.id, email: user.email, name: user.name, role: user.role, familyId: user.family_id, receiveAlerts: !!user.receive_alerts }
    });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- PROFILE ---
app.put('/api/profile', authenticateToken, async (req, res) => {
    const userId = req.user.id;
    const { name, phone, password, receiveAlerts } = req.body;
    try {
        let query = 'UPDATE users SET name = ?, phone = ?, receive_alerts = ?';
        let params = [name, phone, receiveAlerts];
        if (password && password.trim() !== '') {
            const hashedPassword = await bcrypt.hash(password, 10);
            query += ', password_hash = ?';
            params.push(hashedPassword);
        }
        query += ' WHERE id = ?';
        params.push(userId);
        await pool.query(query, params);
        const [updatedUser] = await pool.query('SELECT id, email, name, role, phone, family_id, receive_alerts FROM users WHERE id = ?', [userId]);
        res.json({ success: true, user: { ...updatedUser[0], receiveAlerts: !!updatedUser[0].receive_alerts } });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- SETTINGS ---
app.get('/api/settings', authenticateToken, async (req, res) => {
  try {
    const [rows] = await pool.query('SELECT * FROM settings WHERE id = 1');
    if (rows.length > 0) {
      res.json({ 
          currentYear: rows[0].current_year, 
          smtpConfig: rows[0].smtp_config || {},
          features: rows[0].features || { multiCondo: true, tickets: true, payPal: true, notices: true }
      });
    } else { res.status(404).json({ message: 'Settings not found' }); }
  } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/settings', authenticateToken, requireAdmin, async (req, res) => {
  const { currentYear, smtpConfig, features } = req.body;
  try {
    await pool.query(
        'UPDATE settings SET current_year = ?, smtp_config = ?, features = ? WHERE id = 1', 
        [currentYear, JSON.stringify(smtpConfig), JSON.stringify(features)]
    );
    res.json({ success: true });
  } catch (e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/years', authenticateToken, async (req, res) => {
  try {
    const [rows] = await pool.query('SELECT DISTINCT for_year FROM payments ORDER BY for_year DESC');
    const [settings] = await pool.query('SELECT current_year FROM settings WHERE id = 1');
    const years = new Set(rows.map(r => r.for_year));
    if (settings.length > 0) years.add(settings[0].current_year);
    res.json(Array.from(years).sort((a, b) => b - a));
  } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- CONDOS ---
app.get('/api/condos', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT * FROM condos');
        res.json(rows.map(r => ({
            id: r.id, 
            name: r.name, 
            address: r.address,
            streetNumber: r.street_number,
            city: r.city,
            province: r.province,
            zipCode: r.zip_code,
            notes: r.notes,
            iban: r.iban,
            paypalClientId: r.paypal_client_id, // PayPal
            defaultMonthlyQuota: parseFloat(r.default_monthly_quota), 
            image: r.image
        })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/condos', authenticateToken, requireAdmin, async (req, res) => {
    const { name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId } = req.body;
    const id = uuidv4();
    try {
        await pool.query(
            'INSERT INTO condos (id, name, address, street_number, city, province, zip_code, notes, default_monthly_quota, paypal_client_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)', 
            [id, name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId]
        );
        res.json({ id, name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/condos/:id', authenticateToken, requireAdmin, async (req, res) => {
    const { name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId } = req.body;
    try {
        await pool.query(
            'UPDATE condos SET name = ?, address = ?, street_number = ?, city = ?, province = ?, zip_code = ?, notes = ?, default_monthly_quota = ?, paypal_client_id = ? WHERE id = ?', 
            [name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId, req.params.id]
        );
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/condos/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM condos WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- FAMILIES ---
app.get('/api/families', authenticateToken, async (req, res) => {
  const { condoId } = req.query;
  try {
    let query = `SELECT f.* FROM families f`;
    let params = [];
    
    // Authorization/Filtering logic
    if (req.user.role !== 'admin' && req.user.role !== 'poweruser') {
      // Regular user: can only see their own family
      if (!req.user.familyId) return res.json([]);
      query += ' WHERE f.id = ?';
      params.push(req.user.familyId);
    } else {
      // Admin: If condoId provided, filter by it.
      if (condoId) {
          query += ' WHERE f.condo_id = ?';
          params.push(condoId);
      }
    }

    const [rows] = await pool.query(query, params);
    res.json(rows.map(r => ({
      id: r.id, 
      condoId: r.condo_id, 
      name: r.name, 
      unitNumber: r.unit_number, 
      stair: r.stair, 
      floor: r.floor, 
      notes: r.notes, 
      contactEmail: r.contact_email, 
      customMonthlyQuota: r.custom_monthly_quota ? parseFloat(r.custom_monthly_quota) : undefined, 
      balance: 0
    })));
  } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/families', authenticateToken, requireAdmin, async (req, res) => {
  const { name, unitNumber, stair, floor, notes, contactEmail, condoId, customMonthlyQuota } = req.body;
  const id = uuidv4();
  try {
    await pool.query(
        'INSERT INTO families (id, condo_id, name, unit_number, stair, floor, notes, contact_email, custom_monthly_quota) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)', 
        [id, condoId, name, unitNumber, stair, floor, notes, contactEmail, customMonthlyQuota || null]
    );
    res.json({ id, condoId, name, unitNumber, stair, floor, notes, contactEmail, customMonthlyQuota });
  } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/families/:id', authenticateToken, requireAdmin, async (req, res) => {
  const { name, unitNumber, stair, floor, notes, contactEmail, customMonthlyQuota } = req.body;
  try {
    await pool.query(
        'UPDATE families SET name = ?, unit_number = ?, stair = ?, floor = ?, notes = ?, contact_email = ?, custom_monthly_quota = ? WHERE id = ?', 
        [name, unitNumber, stair, floor, notes, contactEmail, customMonthlyQuota || null, req.params.id]
    );
    res.json({ success: true });
  } catch (e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/families/:id', authenticateToken, requireAdmin, async (req, res) => {
  try {
    await pool.query('DELETE FROM families WHERE id = ?', [req.params.id]);
    res.json({ success: true });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- NOTICES ---
app.get('/api/notices', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        let query = 'SELECT * FROM notices';
        let params = [];
        if (condoId) {
            query += ' WHERE condo_id = ?';
            params.push(condoId);
        }
        query += ' ORDER BY date DESC';
        const [rows] = await pool.query(query, params);
        res.json(rows.map(r => ({ id: r.id, condoId: r.condo_id, title: r.title, content: r.content, type: r.type, link: r.link, date: r.date, active: !!r.active })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/notices', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId, title, content, type, link, active } = req.body;
    const id = uuidv4();
    try {
        await pool.query('INSERT INTO notices (id, condo_id, title, content, type, link, active, date) VALUES (?, ?, ?, ?, ?, ?, ?, NOW())', [id, condoId, title, content, type, link, active]);
        res.json({ id, condoId, title, content, type, link, active });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/notices/:id', authenticateToken, requireAdmin, async (req, res) => {
    const { title, content, type, link, active } = req.body;
    try {
        await pool.query('UPDATE notices SET title = ?, content = ?, type = ?, link = ?, active = ? WHERE id = ?', [title, content, type, link, active, req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/notices/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM notices WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/notices/:id/read', authenticateToken, async (req, res) => {
    const { userId } = req.body;
    try {
        await pool.query('INSERT IGNORE INTO notice_reads (user_id, notice_id, read_at) VALUES (?, ?, NOW())', [userId, req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/notices/:id/reads', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT * FROM notice_reads WHERE notice_id = ?', [req.params.id]);
        res.json(rows.map(r => ({ userId: r.user_id, noticeId: r.notice_id, readAt: r.read_at })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/notices/unread', authenticateToken, async (req, res) => {
    const { userId, condoId } = req.query;
    try {
        const [rows] = await pool.query(`
            SELECT n.* FROM notices n
            LEFT JOIN notice_reads nr ON n.id = nr.notice_id AND nr.user_id = ?
            WHERE n.condo_id = ? AND n.active = TRUE AND nr.read_at IS NULL
            ORDER BY n.date DESC
        `, [userId, condoId]);
        res.json(rows.map(r => ({ id: r.id, condoId: r.condo_id, title: r.title, content: r.content, type: r.type, link: r.link, date: r.date, active: !!r.active })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- PAYMENTS ---
app.get('/api/payments', authenticateToken, async (req, res) => {
  const { familyId } = req.query;
  try {
    const isPrivileged = req.user.role === 'admin' || req.user.role === 'poweruser';
    if (!isPrivileged) {
      if (familyId && familyId !== req.user.familyId) return res.status(403).json({ message: 'Forbidden' });
      if (!familyId) {
         const [rows] = await pool.query('SELECT * FROM payments WHERE family_id = ?', [req.user.familyId]);
         return res.json(rows.map(mapPaymentRow));
      }
    }
    let query = 'SELECT * FROM payments';
    let params = [];
    if (familyId) {
      query += ' WHERE family_id = ?';
      params.push(familyId);
    }
    const [rows] = await pool.query(query, params);
    res.json(rows.map(mapPaymentRow));
  } catch (e) { res.status(500).json({ error: e.message }); }
});
function mapPaymentRow(r) { return { id: r.id, familyId: r.family_id, amount: parseFloat(r.amount), datePaid: r.date_paid, forMonth: r.for_month, forYear: r.for_year, notes: r.notes }; }

app.post('/api/payments', authenticateToken, async (req, res) => {
  const { familyId, amount, datePaid, forMonth, forYear, notes } = req.body;
  
  // Security Check: 
  // Admin can post for anyone. 
  // Regular users can only post for their own family (e.g. PayPal automated callback)
  const isPrivileged = req.user.role === 'admin' || req.user.role === 'poweruser';
  if (!isPrivileged) {
      if (familyId !== req.user.familyId) {
          return res.status(403).json({message: "Forbidden: You can only record payments for your own family."});
      }
  }

  const id = uuidv4();
  try {
    await pool.query('INSERT INTO payments (id, family_id, amount, date_paid, for_month, for_year, notes) VALUES (?, ?, ?, ?, ?, ?, ?)', [id, familyId, amount, new Date(datePaid), forMonth, forYear, notes]);
    res.json({ id, familyId, amount, datePaid, forMonth, forYear, notes });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- USERS ---
app.get('/api/users', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId } = req.query;
    try {
        let query = 'SELECT u.id, u.email, u.name, u.role, u.phone, u.family_id, u.receive_alerts FROM users u';
        let params = [];
        
        // Filter users by condo. 
        // Logic: Users belong to families, families belong to condos.
        if (condoId) {
            query += ' LEFT JOIN families f ON u.family_id = f.id WHERE f.condo_id = ?';
            params.push(condoId);
        }
        
        const [rows] = await pool.query(query, params);
        res.json(rows.map(r => ({ id: r.id, email: r.email, name: r.name, role: r.role, phone: r.phone, familyId: r.family_id, receiveAlerts: !!r.receive_alerts })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/users', authenticateToken, requireAdmin, async (req, res) => {
    const { email, password, name, role, familyId, phone, receiveAlerts } = req.body;
    try {
        const hashedPassword = await bcrypt.hash(password, 10);
        const id = uuidv4();
        await pool.query('INSERT INTO users (id, email, password_hash, name, role, family_id, phone, receive_alerts) VALUES (?, ?, ?, ?, ?, ?, ?, ?)', [id, email, hashedPassword, name, role || 'user', familyId || null, phone, receiveAlerts]);
        res.json({ success: true, id });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/users/:id', authenticateToken, requireAdmin, async (req, res) => {
    const { email, role, familyId, name, phone, password, receiveAlerts } = req.body;
    try {
        let query = 'UPDATE users SET email = ?, role = ?, family_id = ?, name = ?, phone = ?, receive_alerts = ?';
        let params = [email, role, familyId || null, name, phone, receiveAlerts];
        if (password && password.trim() !== '') {
            const hashedPassword = await bcrypt.hash(password, 10);
            query += ', password_hash = ?';
            params.push(hashedPassword);
        }
        query += ' WHERE id = ?';
        params.push(req.params.id);
        await pool.query(query, params);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/users/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM users WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- ALERTS ---
app.get('/api/alerts', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId } = req.query;
    try {
        let query = 'SELECT * FROM alerts';
        let params = [];
        if (condoId) {
            query += ' WHERE condo_id = ?';
            params.push(condoId);
        }
        const [rows] = await pool.query(query, params);
        res.json(rows.map(r => ({ id: r.id, condoId: r.condo_id, subject: r.subject, body: r.body, daysOffset: r.days_offset, offsetType: r.offset_type, sendHour: r.send_hour, active: !!r.active, lastSent: r.last_sent })));
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/alerts', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId, subject, body, daysOffset, offsetType, sendHour, active } = req.body;
    const id = uuidv4();
    try {
        await pool.query('INSERT INTO alerts (id, condo_id, subject, body, days_offset, offset_type, send_hour, active) VALUES (?, ?, ?, ?, ?, ?, ?, ?)', [id, condoId, subject, body, daysOffset, offsetType, sendHour, active]);
        res.json({ id, condoId, subject, body, daysOffset, offsetType, sendHour, active });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.put('/api/alerts/:id', authenticateToken, requireAdmin, async (req, res) => {
    const { subject, body, daysOffset, offsetType, sendHour, active } = req.body;
    try {
        await pool.query('UPDATE alerts SET subject = ?, body = ?, days_offset = ?, offset_type = ?, send_hour = ?, active = ? WHERE id = ?', [subject, body, daysOffset, offsetType, sendHour, active, req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/alerts/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM alerts WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- TICKETS (SEGNALAZIONI) ---
app.get('/api/tickets', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    const userId = req.user.id;
    const isAdmin = req.user.role === 'admin' || req.user.role === 'poweruser';

    try {
        let query = `
            SELECT t.*, u.name as user_name, u.email as user_email 
            FROM tickets t 
            JOIN users u ON t.user_id = u.id
            WHERE t.condo_id = ?
        `;
        let params = [condoId];

        // If not admin, restrict to own tickets
        if (!isAdmin) {
            query += ' AND t.user_id = ?';
            params.push(userId);
        }
        
        query += ' ORDER BY t.created_at DESC';

        const [rows] = await pool.query(query, params);
        
        // Fetch attachments for these tickets
        const ticketIds = rows.map(r => r.id);
        let attachmentsMap = {};
        
        if (ticketIds.length > 0) {
            const placeholders = ticketIds.map(() => '?').join(',');
            // Exclude 'data' column to keep listing light
            const [attRows] = await pool.query(`SELECT id, ticket_id, file_name, file_type FROM ticket_attachments WHERE ticket_id IN (${placeholders})`, ticketIds);
            
            attRows.forEach(a => {
                if (!attachmentsMap[a.ticket_id]) attachmentsMap[a.ticket_id] = [];
                attachmentsMap[a.ticket_id].push({ id: a.id, fileName: a.file_name, fileType: a.file_type });
            });
        }

        const result = rows.map(r => ({
            id: r.id,
            condoId: r.condo_id,
            userId: r.user_id,
            title: r.title,
            description: r.description,
            status: r.status,
            priority: r.priority,
            category: r.category,
            createdAt: r.created_at,
            updatedAt: r.updated_at,
            userName: r.user_name,
            userEmail: r.user_email,
            attachments: attachmentsMap[r.id] || []
        }));

        res.json(result);

    } catch (e) { res.status(500).json({ error: e.message }); }
});

app.get('/api/tickets/:id/attachments/:attachmentId', authenticateToken, async (req, res) => {
    // Serve file content
    try {
        const [rows] = await pool.query('SELECT * FROM ticket_attachments WHERE id = ? AND ticket_id = ?', [req.params.attachmentId, req.params.id]);
        if (rows.length === 0) return res.status(404).json({ message: 'File not found' });
        
        const file = rows[0];
        res.json({ 
            id: file.id, 
            fileName: file.file_name, 
            fileType: file.file_type, 
            data: file.data 
        });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

app.post('/api/tickets', authenticateToken, async (req, res) => {
    const { condoId, title, description, category, priority, attachments } = req.body;
    const userId = req.user.id;
    const ticketId = uuidv4();
    
    // Begin transaction
    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();

        await connection.query(
            'INSERT INTO tickets (id, condo_id, user_id, title, description, category, priority, status) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
            [ticketId, condoId, userId, title, description, category, priority || 'MEDIUM', 'OPEN']
        );

        if (attachments && Array.isArray(attachments)) {
            for (const att of attachments) {
                const attId = uuidv4();
                await connection.query(
                    'INSERT INTO ticket_attachments (id, ticket_id, file_name, file_type, data) VALUES (?, ?, ?, ?, ?)',
                    [attId, ticketId, att.fileName, att.fileType, att.data]
                );
            }
        }

        await connection.commit();
        
        // --- EMAIL NOTIFICATION TO ADMINS ---
        // Find Admins/PowerUsers for this condo (or global) who want alerts
        const [admins] = await connection.query(`
            SELECT u.email FROM users u
            LEFT JOIN families f ON u.family_id = f.id
            WHERE (u.role = 'admin' OR u.role = 'poweruser')
            AND (f.condo_id = ? OR u.family_id IS NULL)
            AND u.receive_alerts = TRUE
        `, [condoId]);

        const adminEmails = admins.map(a => a.email).filter(e => e);
        if (adminEmails.length > 0) {
            // Fetch user name for clearer email
            const [uRows] = await connection.query('SELECT name FROM users WHERE id = ?', [userId]);
            const userName = uRows[0]?.name || 'Un condomino';
            
            const subject = `Nuova Segnalazione: ${title}`;
            const body = `Salve,\n\n${userName} ha aperto una nuova segnalazione.\n\nOggetto: ${title}\nCategoria: ${category}\nPriorità: ${priority || 'MEDIUM'}\n\nDescrizione:\n${description}\n\nAccedi alla piattaforma per gestire il ticket.`;
            
            // Loop to send individually or use BCC
            for(const email of adminEmails) {
                sendDirectEmail(email, subject, body);
            }
        }
        
        res.json({ success: true, id: ticketId });

    } catch (e) {
        await connection.rollback();
        res.status(500).json({ error: e.message });
    } finally {
        connection.release();
    }
});

app.put('/api/tickets/:id', authenticateToken, async (req, res) => {
    const { status, priority } = req.body;
    const isAdmin = req.user.role === 'admin' || req.user.role === 'poweruser';
    
    // Only admins/powerusers can change status/priority for now
    if (!isAdmin) return res.status(403).json({ message: 'Forbidden' });

    try {
        await pool.query(
            'UPDATE tickets SET status = ?, priority = ? WHERE id = ?', 
            [status, priority, req.params.id]
        );

        // --- EMAIL NOTIFICATION TO USER ---
        const [tRows] = await pool.query('SELECT t.title, t.user_id, u.email, u.receive_alerts FROM tickets t JOIN users u ON t.user_id = u.id WHERE t.id = ?', [req.params.id]);
        if (tRows.length > 0) {
            const ticket = tRows[0];
            if (ticket.email && ticket.receive_alerts) {
                const subject = `Aggiornamento Ticket: ${ticket.title}`;
                const body = `Salve,\n\nIl tuo ticket "${ticket.title}" è stato aggiornato.\n\nNuovo Stato: ${status}\nPriorità: ${priority}\n\nAccedi alla piattaforma per i dettagli.`;
                sendDirectEmail(ticket.email, subject, body);
            }
        }

        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

app.delete('/api/tickets/:id', authenticateToken, async (req, res) => {
    // Only delete own ticket if open, or admin can delete any
    const isAdmin = req.user.role === 'admin' || req.user.role === 'poweruser';
    const userId = req.user.id;

    try {
        let query = 'DELETE FROM tickets WHERE id = ?';
        let params = [req.params.id];
        
        if (!isAdmin) {
            query += ' AND user_id = ? AND status = "OPEN"'; // Users can only delete their own OPEN tickets
            params.push(userId);
        }

        const [result] = await pool.query(query, params);
        if (result.affectedRows === 0) {
             return res.status(403).json({ message: 'Cannot delete ticket (Permission denied or not found)' });
        }

        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});


initDb().then(() => {
  app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
  });
});