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(condoId, subject, text) {
    const transport = await getTransporter();
    if (!transport) return;
    // Get users with alerts enabled for this condo (linked via family)
    const query = `
        SELECT u.email FROM users u 
        JOIN families f ON u.family_id = f.id 
        WHERE f.condo_id = ? AND u.receive_alerts = TRUE
    `;
    const [users] = await pool.query(query, [condoId]);
    const bcc = users.map(u => u.email);
    if (bcc.length === 0) return;

    try {
        await transport.transporter.sendMail({
            from: transport.from,
            bcc: bcc,
            subject: subject,
            text: text
        });
        console.log(`Email sent to ${bcc.length} users.`);
    } catch (e) {
        console.error("Email error:", e);
    }
}

// --- 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) => {
    if (err) return res.sendStatus(401); 
    req.user = user;
    next();
  });
};

const requireAdmin = (req, res, next) => {
  if (req.user && (req.user.role === 'admin' || req.user.role === 'poweruser')) {
      next();
  } else {
      res.status(403).json({ message: 'Access denied: Privileged users only' });
  }
};

// --- AUTH & PROFILE ---
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' });
    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 }); }
});

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 || {},
          storageConfig: rows[0].storage_config || { provider: 'local_db' },
          features: rows[0].features || { multiCondo: true, tickets: true, payPal: true, notices: true, reports: true, extraordinaryExpenses: true, condoFinancialsView: false, documents: 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, storageConfig } = req.body;
  try {
    await pool.query(
        'UPDATE settings SET current_year = ?, smtp_config = ?, features = ?, storage_config = ? WHERE id = 1', 
        [currentYear, JSON.stringify(smtpConfig), JSON.stringify(features), JSON.stringify(storageConfig)]
    );
    res.json({ success: true });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

app.post('/api/settings/smtp-test', authenticateToken, requireAdmin, async (req, res) => {
    const config = req.body;
    const userEmail = req.user.email;
    try {
        if (!config.host || !config.user || !config.pass) return res.status(400).json({ message: 'Parametri SMTP incompleti' });
        const transporter = nodemailer.createTransport({
            host: config.host,
            port: config.port,
            secure: config.secure,
            auth: { user: config.user, pass: config.pass },
        });
        await transporter.verify();
        await transporter.sendMail({
            from: config.fromEmail || config.user,
            to: userEmail,
            subject: 'CondoPay - Test Configurazione SMTP',
            text: 'Se leggi questo messaggio, la configurazione SMTP è corretta.',
        });
        res.json({ success: true });
    } catch (e) { res.status(400).json({ message: 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, defaultMonthlyQuota: parseFloat(r.default_monthly_quota), image: r.image, dueDay: r.due_day || 10
        })));
    } 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, dueDay } = 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, due_day) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)', [id, name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId, dueDay || 10]);
        res.json({ id, name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId, dueDay: dueDay || 10 });
    } 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, dueDay } = req.body;
    try {
        await pool.query('UPDATE condos SET name = ?, address = ?, street_number = ?, city = ?, province = ?, zip_code = ?, notes = ?, default_monthly_quota = ?, paypal_client_id = ?, due_day = ? WHERE id = ?', [name, address, streetNumber, city, province, zipCode, notes, defaultMonthlyQuota, paypalClientId, dueDay || 10, 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 = [];
    if (req.user.role !== 'admin' && req.user.role !== 'poweruser') {
      if (!req.user.familyId) return res.json([]);
      query += ' WHERE f.id = ?';
      params.push(req.user.familyId);
    } else 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 }); }
});

// --- PAYMENTS (INCOME) ---
app.get('/api/payments', authenticateToken, async (req, res) => {
    const { familyId, condoId } = req.query;
    try {
        let query = 'SELECT p.* FROM payments p JOIN families f ON p.family_id = f.id';
        let params = [];
        let conditions = [];
        if (familyId) { conditions.push('p.family_id = ?'); params.push(familyId); }
        if (condoId) { conditions.push('f.condo_id = ?'); params.push(condoId); }
        if (conditions.length > 0) { query += ' WHERE ' + conditions.join(' AND '); }
        query += ' ORDER BY p.date_paid DESC';
        const [rows] = await pool.query(query, params);
        res.json(rows.map(r => ({ 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 })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/payments', authenticateToken, async (req, res) => {
    const { familyId, amount, datePaid, forMonth, forYear, notes } = req.body;
    if (req.user.role !== 'admin' && req.user.role !== 'poweruser' && req.user.familyId !== familyId) return res.status(403).json({ message: 'Unauthorized' });
    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, 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, async (req, res) => {
  const { condoId } = req.query;
  try {
    let query = 'SELECT id, email, name, role, phone, family_id, receive_alerts, created_at FROM users';
    let params = [];
    if (condoId) {
         query = `SELECT u.id, u.email, u.name, u.role, u.phone, u.family_id, u.receive_alerts, u.created_at FROM users u LEFT JOIN families f ON u.family_id = f.id WHERE f.condo_id = ? OR u.role IN ('admin', 'poweruser')`;
         params = [condoId];
    }
    const [rows] = await pool.query(query, params);
    res.json(rows.map(u => ({ id: u.id, email: u.email, name: u.name, role: u.role, phone: u.phone, familyId: u.family_id, receiveAlerts: !!u.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, phone, familyId, receiveAlerts } = req.body;
    const id = uuidv4();
    try {
        const hashedPassword = await bcrypt.hash(password || 'password', 10);
        await pool.query('INSERT INTO users (id, email, password_hash, name, role, phone, family_id, receive_alerts) VALUES (?, ?, ?, ?, ?, ?, ?, ?)', [id, email, hashedPassword, name, role, phone, familyId || null, 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, name, role, phone, familyId, receiveAlerts, password } = req.body;
    try {
        let query = 'UPDATE users SET email = ?, name = ?, role = ?, phone = ?, family_id = ?, receive_alerts = ?';
        let params = [email, name, role, phone, familyId || null, receiveAlerts];
        if (password) {
            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 }); }
});

// --- NOTICES (BACHECA) ---
app.get('/api/notices', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        const [rows] = await pool.query('SELECT * FROM notices WHERE condo_id = ? ORDER BY date DESC', [condoId]);
        res.json(rows.map(r => ({...r, targetFamilyIds: r.target_families ? r.target_families : []})));
    } 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 [notices] = await pool.query(
            'SELECT * FROM notices WHERE condo_id = ? AND active = TRUE ORDER BY date DESC', 
            [condoId]
        );
        const [reads] = await pool.query('SELECT notice_id FROM notice_reads WHERE user_id = ?', [userId]);
        const readIds = new Set(reads.map(r => r.notice_id));
        
        // Filter logic: Standard user only sees Public or Targeted
        const user = (await pool.query('SELECT family_id FROM users WHERE id = ?', [userId]))[0][0];
        
        const relevant = notices.filter(n => {
            const targets = n.target_families || [];
            if (targets.length === 0) return true; // Public
            return user && user.family_id && targets.includes(user.family_id);
        });

        const unread = relevant.filter(n => !readIds.has(n.id));
        res.json(unread);
    } 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, targetFamilyIds } = req.body;
    const id = uuidv4();
    try {
        await pool.query('INSERT INTO notices (id, condo_id, title, content, type, link, active, target_families) VALUES (?, ?, ?, ?, ?, ?, ?, ?)', [id, condoId, title, content, type, link, active, JSON.stringify(targetFamilyIds)]);
        if (active) sendEmailToUsers(condoId, `Nuovo Avviso: ${title}`, content);
        res.json({ success: true, id });
    } 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, targetFamilyIds } = req.body;
    try {
        await pool.query('UPDATE notices SET title = ?, content = ?, type = ?, link = ?, active = ?, target_families = ? WHERE id = ?', [title, content, type, link, active, JSON.stringify(targetFamilyIds), 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.get('/api/notices/:id/read-status', authenticateToken, requireAdmin, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT user_id, read_at FROM notice_reads WHERE notice_id = ?', [req.params.id]);
        res.json(rows.map(r => ({ userId: r.user_id, readAt: r.read_at })));
    } 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) VALUES (?, ?)', [userId, req.params.id]);
        res.json({ success: true });
    } catch (e) { res.status(500).json({ error: e.message }); }
});

// --- ALERTS ---
app.get('/api/alerts', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        const [rows] = await pool.query('SELECT * FROM alerts WHERE condo_id = ?', [condoId]);
        res.json(rows.map(r => ({
            id: r.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, 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, id: req.params.id });
    } 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 ---
app.get('/api/tickets', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        let query = `
            SELECT t.*, u.name as userName, u.email as userEmail 
            FROM tickets t 
            JOIN users u ON t.user_id = u.id 
            WHERE t.condo_id = ?
        `;
        let params = [condoId];
        
        if (req.user.role !== 'admin' && req.user.role !== 'poweruser') {
            query += ' AND t.user_id = ?';
            params.push(req.user.id);
        }
        query += ' ORDER BY t.updated_at DESC';
        
        const [rows] = await pool.query(query, params);
        
        // Fetch light attachment info (no data)
        const [attRows] = await pool.query('SELECT id, ticket_id, file_name, file_type FROM ticket_attachments');
        
        const results = 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.userName, userEmail: r.userEmail,
            attachments: attRows.filter(a => a.ticket_id === r.id).map(a => ({ id: a.id, fileName: a.file_name, fileType: a.file_type }))
        }));
        res.json(results);
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/tickets', authenticateToken, async (req, res) => {
    const { condoId, title, description, priority, category, attachments } = req.body;
    const id = uuidv4();
    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();
        await connection.query(
            'INSERT INTO tickets (id, condo_id, user_id, title, description, priority, category) VALUES (?, ?, ?, ?, ?, ?, ?)',
            [id, condoId, req.user.id, title, description, priority, category]
        );
        
        if (attachments && attachments.length > 0) {
            for(const att of attachments) {
                await connection.query(
                    'INSERT INTO ticket_attachments (id, ticket_id, file_name, file_type, data) VALUES (?, ?, ?, ?, ?)',
                    [uuidv4(), id, att.fileName, att.fileType, att.data]
                );
            }
        }
        await connection.commit();
        res.json({ success: true, id });
    } 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; // User can only close, admin can change status/priority
    // In real app check permissions more granually
    try {
        await pool.query('UPDATE tickets SET status = ?, priority = ? WHERE id = ?', [status, priority, req.params.id]);
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/tickets/:id', authenticateToken, async (req, res) => {
    try {
        // Only admin or owner can delete. Simplified here.
        await pool.query('DELETE FROM tickets WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/tickets/:id/attachments/:attId', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT * FROM ticket_attachments WHERE id = ?', [req.params.attId]);
        if (rows.length === 0) return res.status(404).json({ message: '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.get('/api/tickets/:id/comments', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query(`
            SELECT c.*, u.name as userName 
            FROM ticket_comments c JOIN users u ON c.user_id = u.id 
            WHERE c.ticket_id = ? ORDER BY c.created_at ASC
        `, [req.params.id]);
        res.json(rows.map(r => ({ id: r.id, ticketId: r.ticket_id, userId: r.user_id, userName: r.userName, text: r.text, createdAt: r.created_at })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/tickets/:id/comments', authenticateToken, async (req, res) => {
    const { text } = req.body;
    const id = uuidv4();
    try {
        await pool.query('INSERT INTO ticket_comments (id, ticket_id, user_id, text) VALUES (?, ?, ?, ?)', [id, req.params.id, req.user.id, text]);
        // Update ticket updated_at
        await pool.query('UPDATE tickets SET updated_at = CURRENT_TIMESTAMP WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});

// --- EXTRAORDINARY EXPENSES ---
app.get('/api/expenses', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        const [rows] = await pool.query('SELECT * FROM extraordinary_expenses WHERE condo_id = ? ORDER BY created_at DESC', [condoId]);
        res.json(rows.map(r => ({
            id: r.id, condoId: r.condo_id, title: r.title, description: r.description,
            startDate: r.start_date, endDate: r.end_date, contractorName: r.contractor_name, totalAmount: parseFloat(r.total_amount)
        })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/expenses/:id', authenticateToken, async (req, res) => {
    try {
        const [exp] = await pool.query('SELECT * FROM extraordinary_expenses WHERE id = ?', [req.params.id]);
        if(exp.length === 0) return res.status(404).json({ message: 'Not Found' });
        
        const [items] = await pool.query('SELECT * FROM expense_items WHERE expense_id = ?', [req.params.id]);
        const [shares] = await pool.query(`
            SELECT s.*, f.name as familyName 
            FROM expense_shares s JOIN families f ON s.family_id = f.id 
            WHERE s.expense_id = ?
        `, [req.params.id]);
        const [atts] = await pool.query('SELECT id, file_name, file_type FROM expense_attachments WHERE expense_id = ?', [req.params.id]);

        const result = {
            ...exp[0],
            totalAmount: parseFloat(exp[0].total_amount),
            items: items.map(i => ({ description: i.description, amount: parseFloat(i.amount) })),
            shares: shares.map(s => ({
                id: s.id, familyId: s.family_id, familyName: s.familyName,
                percentage: parseFloat(s.percentage), amountDue: parseFloat(s.amount_due), amountPaid: parseFloat(s.amount_paid), status: s.status
            })),
            attachments: atts.map(a => ({ id: a.id, fileName: a.file_name, fileType: a.file_type }))
        };
        // Fix keys
        result.startDate = result.start_date; result.endDate = result.end_date; result.contractorName = result.contractor_name;
        res.json(result);
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/expenses', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId, title, description, startDate, endDate, contractorName, items, shares, attachments } = req.body;
    const id = uuidv4();
    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();
        const totalAmount = items.reduce((acc, i) => acc + i.amount, 0);
        
        await connection.query(
            'INSERT INTO extraordinary_expenses (id, condo_id, title, description, start_date, end_date, contractor_name, total_amount) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
            [id, condoId, title, description, startDate, endDate, contractorName, totalAmount]
        );

        for (const item of items) {
            await connection.query('INSERT INTO expense_items (id, expense_id, description, amount) VALUES (?, ?, ?, ?)', [uuidv4(), id, item.description, item.amount]);
        }

        for (const share of shares) {
            await connection.query('INSERT INTO expense_shares (id, expense_id, family_id, percentage, amount_due, amount_paid, status) VALUES (?, ?, ?, ?, ?, ?, ?)', 
            [uuidv4(), id, share.familyId, share.percentage, share.amountDue, 0, 'UNPAID']);
        }

        if (attachments && attachments.length > 0) {
            for(const att of attachments) {
                await connection.query('INSERT INTO expense_attachments (id, expense_id, file_name, file_type, data) VALUES (?, ?, ?, ?, ?)', [uuidv4(), id, att.fileName, att.fileType, att.data]);
            }
        }

        await connection.commit();
        res.json({ success: true, id });
    } catch(e) { await connection.rollback(); res.status(500).json({ error: e.message }); } finally { connection.release(); }
});
app.delete('/api/expenses/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM extraordinary_expenses WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/expenses/:id/attachments/:attId', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT * FROM expense_attachments WHERE id = ?', [req.params.attId]);
        if (rows.length === 0) return res.status(404).json({ message: 'File not found' });
        res.json({ id: rows[0].id, fileName: rows[0].file_name, fileType: rows[0].file_type, data: rows[0].data });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/my-expenses', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    if (!req.user.familyId) return res.json([]);
    try {
        const [shares] = await pool.query(`
            SELECT s.*, e.title, e.start_date, e.total_amount, e.contractor_name
            FROM expense_shares s 
            JOIN extraordinary_expenses e ON s.expense_id = e.id
            WHERE s.family_id = ? AND e.condo_id = ?
            ORDER BY e.created_at DESC
        `, [req.user.familyId, condoId]);
        
        res.json(shares.map(s => ({
            id: s.expense_id, // Use expense ID as main ID for listing
            title: s.title, startDate: s.start_date, totalAmount: parseFloat(s.total_amount), contractorName: s.contractor_name,
            myShare: {
                percentage: parseFloat(s.percentage), amountDue: parseFloat(s.amount_due), amountPaid: parseFloat(s.amount_paid), status: s.status
            }
        })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/expenses/:id/pay', authenticateToken, async (req, res) => {
    const { amount, notes, familyId } = req.body;
    // If Admin, familyId is passed. If User, use req.user.familyId
    const targetFamilyId = (req.user.role === 'admin' || req.user.role === 'poweruser') ? familyId : req.user.familyId;
    if (!targetFamilyId) return res.status(400).json({ message: 'Family not found' });

    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();
        
        // 1. Record payment in main payments table (linked to extraordinary expense?) 
        // For simplicity in this schema we might just update the share or add a row in `payments` with special flag
        // Current Schema `payments` has `extraordinary_expense_id` column.
        await connection.query(
            'INSERT INTO payments (id, family_id, extraordinary_expense_id, amount, date_paid, for_month, for_year, notes) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
            [uuidv4(), targetFamilyId, req.params.id, amount, new Date(), 13, new Date().getFullYear(), notes || 'Extraordinary Payment']
        );

        // 2. Update Share
        const [shares] = await connection.query('SELECT * FROM expense_shares WHERE expense_id = ? AND family_id = ?', [req.params.id, targetFamilyId]);
        if (shares.length === 0) throw new Error('Share not found');
        
        const share = shares[0];
        const newPaid = parseFloat(share.amount_paid) + parseFloat(amount);
        const due = parseFloat(share.amount_due);
        let newStatus = 'PARTIAL';
        if (newPaid >= due - 0.01) newStatus = 'PAID'; // Tolerance
        
        await connection.query('UPDATE expense_shares SET amount_paid = ?, status = ? WHERE id = ?', [newPaid, newStatus, share.id]);
        
        await connection.commit();
        res.json({ success: true });
    } catch(e) { await connection.rollback(); res.status(500).json({ error: e.message }); } finally { connection.release(); }
});
app.get('/api/expenses/:id/shares/:familyId/payments', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query(
            'SELECT * FROM payments WHERE extraordinary_expense_id = ? AND family_id = ? ORDER BY date_paid DESC',
            [req.params.id, req.params.familyId]
        );
        res.json(rows.map(r => ({ id: r.id, amount: parseFloat(r.amount), datePaid: r.date_paid, notes: r.notes })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/expenses/payments/:paymentId', authenticateToken, requireAdmin, async (req, res) => {
    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();
        const [pay] = await connection.query('SELECT * FROM payments WHERE id = ?', [req.params.paymentId]);
        if (pay.length === 0) throw new Error('Payment not found');
        const payment = pay[0];
        if (!payment.extraordinary_expense_id) throw new Error('Not an extraordinary payment');

        // Delete payment
        await connection.query('DELETE FROM payments WHERE id = ?', [req.params.paymentId]);

        // Revert share
        const [shares] = await connection.query('SELECT * FROM expense_shares WHERE expense_id = ? AND family_id = ?', [payment.extraordinary_expense_id, payment.family_id]);
        if (shares.length > 0) {
            const share = shares[0];
            const newPaid = Math.max(0, parseFloat(share.amount_paid) - parseFloat(payment.amount));
            const newStatus = newPaid >= parseFloat(share.amount_due) - 0.01 ? 'PAID' : (newPaid > 0 ? 'PARTIAL' : 'UNPAID');
            await connection.query('UPDATE expense_shares SET amount_paid = ?, status = ? WHERE id = ?', [newPaid, newStatus, share.id]);
        }

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

// --- CONDO ORDINARY EXPENSES (USCITE) ---
app.get('/api/condo-expenses', authenticateToken, async (req, res) => {
    const { condoId, year } = req.query;
    try {
        let query = 'SELECT * FROM condo_expenses WHERE condo_id = ?';
        let params = [condoId];
        if (year) {
            query += ' AND (YEAR(created_at) = ? OR YEAR(payment_date) = ?)';
            params.push(year, year);
        }
        query += ' ORDER BY created_at DESC';
        const [rows] = await pool.query(query, params);
        const [allAtts] = await pool.query('SELECT id, condo_expense_id, file_name, file_type FROM condo_expense_attachments');
        
        const results = rows.map(r => ({
            id: r.id, condoId: r.condo_id, description: r.description, supplierName: r.supplier_name,
            amount: parseFloat(r.amount), paymentDate: r.payment_date, status: r.status,
            paymentMethod: r.payment_method, invoiceNumber: r.invoice_number, notes: r.notes, createdAt: r.created_at,
            attachments: allAtts.filter(a => a.condo_expense_id === r.id).map(a => ({ id: a.id, fileName: a.file_name, fileType: a.file_type }))
        }));
        res.json(results);
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.post('/api/condo-expenses', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId, description, supplierName, amount, paymentDate, status, paymentMethod, invoiceNumber, notes, attachments } = req.body;
    const id = uuidv4();
    const connection = await pool.getConnection();
    try {
        await connection.beginTransaction();
        await connection.query(
            'INSERT INTO condo_expenses (id, condo_id, description, supplier_name, amount, payment_date, status, payment_method, invoice_number, notes) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
            [id, condoId, description, supplierName, amount, paymentDate || null, status, paymentMethod, invoiceNumber, notes]
        );
        if (attachments && attachments.length > 0) {
            for(const att of attachments) {
                await connection.query('INSERT INTO condo_expense_attachments (id, condo_expense_id, file_name, file_type, data) VALUES (?, ?, ?, ?, ?)', [uuidv4(), id, att.fileName, att.fileType, att.data]);
            }
        }
        await connection.commit();
        res.json({ success: true, id });
    } catch(e) { await connection.rollback(); res.status(500).json({ error: e.message }); } finally { connection.release(); }
});
app.put('/api/condo-expenses/:id', authenticateToken, requireAdmin, async (req, res) => {
    const { description, supplierName, amount, paymentDate, status, paymentMethod, invoiceNumber, notes } = req.body;
    try {
        await pool.query(
            'UPDATE condo_expenses SET description=?, supplier_name=?, amount=?, payment_date=?, status=?, payment_method=?, invoice_number=?, notes=? WHERE id=?',
            [description, supplierName, amount, paymentDate || null, status, paymentMethod, invoiceNumber, notes, req.params.id]
        );
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.delete('/api/condo-expenses/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        await pool.query('DELETE FROM condo_expenses WHERE id = ?', [req.params.id]);
        res.json({ success: true });
    } catch(e) { res.status(500).json({ error: e.message }); }
});
app.get('/api/condo-expenses/:id/attachments/:attId', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT * FROM condo_expense_attachments WHERE id = ?', [req.params.attId]);
        if (rows.length === 0) return res.status(404).json({ message: 'File not found' });
        res.json({ id: rows[0].id, fileName: rows[0].file_name, fileType: rows[0].file_type, data: rows[0].data });
    } catch(e) { res.status(500).json({ error: e.message }); }
});

// --- DOCUMENTS (CLOUD/LOCAL) ---
app.get('/api/documents', authenticateToken, async (req, res) => {
    const { condoId } = req.query;
    try {
        // We only fetch metadata, not file_data
        const [rows] = await pool.query('SELECT id, condo_id, title, description, file_name, file_type, file_size, tags, storage_provider, upload_date FROM documents WHERE condo_id = ? ORDER BY upload_date DESC', [condoId]);
        res.json(rows.map(r => ({
            id: r.id, condoId: r.condo_id, title: r.title, description: r.description,
            fileName: r.file_name, fileType: r.file_type, fileSize: r.file_size,
            tags: r.tags || [], storageProvider: r.storage_provider, uploadDate: r.upload_date
        })));
    } catch(e) { res.status(500).json({ error: e.message }); }
});

app.post('/api/documents', authenticateToken, requireAdmin, async (req, res) => {
    const { condoId, title, description, fileName, fileType, fileSize, tags, fileData, storageConfig } = req.body;
    const id = uuidv4();
    try {
        // Here we would implement real Cloud Storage logic based on storageConfig.provider
        // For 'local_db' or fallback, we save base64 in DB.
        
        let provider = storageConfig?.provider || 'local_db';
        // Mocking Cloud upload by just saving to DB for demo purposes, 
        // but acknowledging the config
        
        await pool.query(
            'INSERT INTO documents (id, condo_id, title, description, file_name, file_type, file_size, tags, storage_provider, file_data) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
            [id, condoId, title, description, fileName, fileType, fileSize, JSON.stringify(tags), provider, fileData]
        );
        res.json({ success: true, id });
    } catch(e) { res.status(500).json({ error: e.message }); }
});

app.get('/api/documents/:id/download', authenticateToken, async (req, res) => {
    try {
        const [rows] = await pool.query('SELECT file_name, file_type, file_data, storage_provider FROM documents WHERE id = ?', [req.params.id]);
        if (rows.length === 0) return res.status(404).json({ message: 'Not Found' });
        const doc = rows[0];
        
        // If external provider (S3/Drive), we would generate a Signed URL here or proxy the stream.
        // For local_db:
        res.json({ 
            fileName: doc.file_name, 
            fileType: doc.file_type, 
            data: doc.file_data // Base64
        });
    } catch(e) { res.status(500).json({ error: e.message }); }
});

app.delete('/api/documents/:id', authenticateToken, requireAdmin, async (req, res) => {
    try {
        // Also delete from cloud if configured...
        await pool.query('DELETE FROM documents WHERE id = ?', [req.params.id]);
        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}`);
  });
});