const express = require('express');
const { Pool } = require('pg');
const path = require('path');
const puppeteer = require('puppeteer');
const fs = require('fs').promises;
const multer = require('multer');

const app = express();
const PORT = process.env.PORT || 3000;

// Global browser instance
let browser = null;

// Initialize browser on startup
async function initBrowser() {
    if (!browser) {
        console.log('[BROWSER] Launching persistent browser...');
        browser = await puppeteer.launch({
            headless: 'new',
            args: [
                '--no-sandbox',
                '--disable-setuid-sandbox',
                '--disable-dev-shm-usage',
                '--disable-gpu',
                '--disable-software-rasterizer',
                '--no-zygote',
                '--single-process'
            ],
            protocolTimeout: 180000,
            timeout: 180000
        });
        console.log('[BROWSER] Browser launched and ready');
        
        // Restart browser if it crashes
        browser.on('disconnected', () => {
            console.log('[BROWSER] Browser disconnected, restarting...');
            browser = null;
            initBrowser();
        });
    }
    return browser;
}

// Database connection
const pool = new Pool({
    user: process.env.DB_USER || 'postgres',
    host: process.env.DB_HOST || 'localhost',
    database: process.env.DB_NAME || 'quotes_db',
    password: process.env.DB_PASSWORD || 'postgres',
    port: process.env.DB_PORT || 5432,
});

// Middleware
app.use(express.json());
app.use(express.static('public'));

// Configure multer for logo upload
const storage = multer.diskStorage({
    destination: async (req, file, cb) => {
        const uploadDir = path.join(__dirname, 'public', 'uploads');
        try {
            await fs.mkdir(uploadDir, { recursive: true });
        } catch (err) {
            console.error('Error creating upload directory:', err);
        }
        cb(null, uploadDir);
    },
    filename: (req, file, cb) => {
        cb(null, 'company-logo.png');
    }
});

const upload = multer({
    storage: storage,
    limits: { fileSize: 5 * 1024 * 1024 },
    fileFilter: (req, file, cb) => {
        if (file.mimetype.startsWith('image/')) {
            cb(null, true);
        } else {
            cb(new Error('Only image files are allowed'));
        }
    }
});

// Helper functions
function formatDate(date) {
    const d = new Date(date);
    const month = String(d.getMonth() + 1).padStart(2, '0');
    const day = String(d.getDate()).padStart(2, '0');
    const year = d.getFullYear();
    return `${month}/${day}/${year}`;
}

async function getNextQuoteNumber() {
    const year = new Date().getFullYear();
    const result = await pool.query(
        'SELECT quote_number FROM quotes WHERE quote_number LIKE $1 ORDER BY quote_number DESC LIMIT 1',
        [`${year}-%`]
    );
    
    if (result.rows.length === 0) {
        return `${year}-001`;
    }
    
    const lastNumber = parseInt(result.rows[0].quote_number.split('-')[1]);
    const nextNumber = String(lastNumber + 1).padStart(3, '0');
    return `${year}-${nextNumber}`;
}

async function getNextInvoiceNumber() {
    const year = new Date().getFullYear();
    const result = await pool.query(
        'SELECT invoice_number FROM invoices WHERE invoice_number LIKE $1 ORDER BY invoice_number DESC LIMIT 1',
        [`${year}-%`]
    );
    
    if (result.rows.length === 0) {
        return `${year}-001`;
    }
    
    const lastNumber = parseInt(result.rows[0].invoice_number.split('-')[1]);
    const nextNumber = String(lastNumber + 1).padStart(3, '0');
    return `${year}-${nextNumber}`;
}

// Logo endpoints
app.get('/api/logo-info', async (req, res) => {
    try {
        const logoPath = path.join(__dirname, 'public', 'uploads', 'company-logo.png');
        try {
            await fs.access(logoPath);
            res.json({ hasLogo: true, logoPath: '/uploads/company-logo.png' });
        } catch {
            res.json({ hasLogo: false });
        }
    } catch (error) {
        console.error('Error checking logo:', error);
        res.status(500).json({ error: 'Error checking logo' });
    }
});

app.post('/api/upload-logo', upload.single('logo'), async (req, res) => {
    try {
        if (!req.file) {
            return res.status(400).json({ error: 'No file uploaded' });
        }
        res.json({ 
            message: 'Logo uploaded successfully',
            path: '/uploads/company-logo.png'
        });
    } catch (error) {
        console.error('Upload error:', error);
        res.status(500).json({ error: 'Error uploading logo' });
    }
});

// Customer endpoints
app.get('/api/customers', async (req, res) => {
    try {
        const result = await pool.query('SELECT * FROM customers ORDER BY name');
        res.json(result.rows);
    } catch (error) {
        console.error('Error fetching customers:', error);
        res.status(500).json({ error: 'Error fetching customers' });
    }
});

app.post('/api/customers', async (req, res) => {
    const { name, street, city, state, zip_code, account_number } = req.body;
    try {
        const result = await pool.query(
            'INSERT INTO customers (name, street, city, state, zip_code, account_number) VALUES ($1, $2, $3, $4, $5, $6) RETURNING *',
            [name, street, city, state, zip_code, account_number]
        );
        res.json(result.rows[0]);
    } catch (error) {
        console.error('Error creating customer:', error);
        res.status(500).json({ error: 'Error creating customer' });
    }
});

app.put('/api/customers/:id', async (req, res) => {
    const { id } = req.params;
    const { name, street, city, state, zip_code, account_number } = req.body;
    try {
        const result = await pool.query(
            'UPDATE customers SET name = $1, street = $2, city = $3, state = $4, zip_code = $5, account_number = $6, updated_at = CURRENT_TIMESTAMP WHERE id = $7 RETURNING *',
            [name, street, city, state, zip_code, account_number, id]
        );
        res.json(result.rows[0]);
    } catch (error) {
        console.error('Error updating customer:', error);
        res.status(500).json({ error: 'Error updating customer' });
    }
});

app.delete('/api/customers/:id', async (req, res) => {
    const { id } = req.params;
    try {
        await pool.query('DELETE FROM customers WHERE id = $1', [id]);
        res.json({ success: true });
    } catch (error) {
        console.error('Error deleting customer:', error);
        res.status(500).json({ error: 'Error deleting customer' });
    }
});

// Quote endpoints
app.get('/api/quotes', async (req, res) => {
    try {
        const result = await pool.query(`
            SELECT q.*, c.name as customer_name
            FROM quotes q
            LEFT JOIN customers c ON q.customer_id = c.id
            ORDER BY q.created_at DESC
        `);
        res.json(result.rows);
    } catch (error) {
        console.error('Error fetching quotes:', error);
        res.status(500).json({ error: 'Error fetching quotes' });
    }
});

app.get('/api/quotes/:id', async (req, res) => {
    const { id } = req.params;
    try {
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM quotes q
            LEFT JOIN customers c ON q.customer_id = c.id
            WHERE q.id = $1
        `, [id]);
        
        if (quoteResult.rows.length === 0) {
            return res.status(404).json({ error: 'Quote not found' });
        }
        
        const itemsResult = await pool.query(
            'SELECT * FROM quote_items WHERE quote_id = $1 ORDER BY item_order',
            [id]
        );
        
        res.json({
            quote: quoteResult.rows[0],
            items: itemsResult.rows
        });
    } catch (error) {
        console.error('Error fetching quote:', error);
        res.status(500).json({ error: 'Error fetching quote' });
    }
});

app.post('/api/quotes', async (req, res) => {
    const { customer_id, quote_date, tax_exempt, items } = req.body;
    
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        const quote_number = await getNextQuoteNumber();
        
        let subtotal = 0;
        let has_tbd = false;
        
        for (const item of items) {
            if (item.rate.toUpperCase() === 'TBD' || item.amount.toUpperCase() === 'TBD') {
                has_tbd = true;
            } else {
                const amount = parseFloat(item.amount.replace(/[$,]/g, ''));
                if (!isNaN(amount)) {
                    subtotal += amount;
                }
            }
        }
        
        const tax_rate = 8.25;
        const tax_amount = tax_exempt ? 0 : (subtotal * tax_rate / 100);
        const total = subtotal + tax_amount;
        
        const quoteResult = await client.query(
            `INSERT INTO quotes (quote_number, customer_id, quote_date, tax_exempt, tax_rate, subtotal, tax_amount, total, has_tbd)
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9) RETURNING *`,
            [quote_number, customer_id, quote_date, tax_exempt, tax_rate, subtotal, tax_amount, total, has_tbd]
        );
        
        const quoteId = quoteResult.rows[0].id;
        
        for (let i = 0; i < items.length; i++) {
            await client.query(
                'INSERT INTO quote_items (quote_id, quantity, description, rate, amount, item_order) VALUES ($1, $2, $3, $4, $5, $6)',
                [quoteId, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i]
            );
        }
        
        await client.query('COMMIT');
        res.json(quoteResult.rows[0]);
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error creating quote:', error);
        res.status(500).json({ error: 'Error creating quote' });
    } finally {
        client.release();
    }
});

app.put('/api/quotes/:id', async (req, res) => {
    const { id } = req.params;
    const { customer_id, quote_date, tax_exempt, items } = req.body;
    
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        let subtotal = 0;
        let has_tbd = false;
        
        for (const item of items) {
            if (item.rate.toUpperCase() === 'TBD' || item.amount.toUpperCase() === 'TBD') {
                has_tbd = true;
            } else {
                const amount = parseFloat(item.amount.replace(/[$,]/g, ''));
                if (!isNaN(amount)) {
                    subtotal += amount;
                }
            }
        }
        
        const tax_rate = 8.25;
        const tax_amount = tax_exempt ? 0 : (subtotal * tax_rate / 100);
        const total = subtotal + tax_amount;
        
        await client.query(
            `UPDATE quotes SET customer_id = $1, quote_date = $2, tax_exempt = $3, tax_rate = $4, 
             subtotal = $5, tax_amount = $6, total = $7, has_tbd = $8, updated_at = CURRENT_TIMESTAMP
             WHERE id = $9`,
            [customer_id, quote_date, tax_exempt, tax_rate, subtotal, tax_amount, total, has_tbd, id]
        );
        
        await client.query('DELETE FROM quote_items WHERE quote_id = $1', [id]);
        
        for (let i = 0; i < items.length; i++) {
            await client.query(
                'INSERT INTO quote_items (quote_id, quantity, description, rate, amount, item_order) VALUES ($1, $2, $3, $4, $5, $6)',
                [id, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i]
            );
        }
        
        await client.query('COMMIT');
        res.json({ success: true });
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error updating quote:', error);
        res.status(500).json({ error: 'Error updating quote' });
    } finally {
        client.release();
    }
});

app.delete('/api/quotes/:id', async (req, res) => {
    const { id } = req.params;
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        await client.query('DELETE FROM quote_items WHERE quote_id = $1', [id]);
        await client.query('DELETE FROM quotes WHERE id = $1', [id]);
        await client.query('COMMIT');
        res.json({ success: true });
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error deleting quote:', error);
        res.status(500).json({ error: 'Error deleting quote' });
    } finally {
        client.release();
    }
});

// Invoice endpoints
app.get('/api/invoices', async (req, res) => {
    try {
        const result = await pool.query(`
            SELECT i.*, c.name as customer_name
            FROM invoices i
            LEFT JOIN customers c ON i.customer_id = c.id
            ORDER BY i.created_at DESC
        `);
        res.json(result.rows);
    } catch (error) {
        console.error('Error fetching invoices:', error);
        res.status(500).json({ error: 'Error fetching invoices' });
    }
});

app.get('/api/invoices/:id', async (req, res) => {
    const { id } = req.params;
    try {
        const invoiceResult = await pool.query(`
            SELECT i.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM invoices i
            LEFT JOIN customers c ON i.customer_id = c.id
            WHERE i.id = $1
        `, [id]);
        
        if (invoiceResult.rows.length === 0) {
            return res.status(404).json({ error: 'Invoice not found' });
        }
        
        const itemsResult = await pool.query(
            'SELECT * FROM invoice_items WHERE invoice_id = $1 ORDER BY item_order',
            [id]
        );
        
        res.json({
            invoice: invoiceResult.rows[0],
            items: itemsResult.rows
        });
    } catch (error) {
        console.error('Error fetching invoice:', error);
        res.status(500).json({ error: 'Error fetching invoice' });
    }
});

app.post('/api/invoices', async (req, res) => {
    const { customer_id, invoice_date, terms, auth_code, tax_exempt, items, created_from_quote_id } = req.body;
    
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        const invoice_number = await getNextInvoiceNumber();
        
        let subtotal = 0;
        
        for (const item of items) {
            const amount = parseFloat(item.amount.replace(/[$,]/g, ''));
            if (!isNaN(amount)) {
                subtotal += amount;
            }
        }
        
        const tax_rate = 8.25;
        const tax_amount = tax_exempt ? 0 : (subtotal * tax_rate / 100);
        const total = subtotal + tax_amount;
        
        const invoiceResult = await client.query(
            `INSERT INTO invoices (invoice_number, customer_id, invoice_date, terms, auth_code, tax_exempt, tax_rate, subtotal, tax_amount, total, created_from_quote_id)
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) RETURNING *`,
            [invoice_number, customer_id, invoice_date, terms, auth_code, tax_exempt, tax_rate, subtotal, tax_amount, total, created_from_quote_id]
        );
        
        const invoiceId = invoiceResult.rows[0].id;
        
        for (let i = 0; i < items.length; i++) {
            await client.query(
                'INSERT INTO invoice_items (invoice_id, quantity, description, rate, amount, item_order) VALUES ($1, $2, $3, $4, $5, $6)',
                [invoiceId, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i]
            );
        }
        
        await client.query('COMMIT');
        res.json(invoiceResult.rows[0]);
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error creating invoice:', error);
        res.status(500).json({ error: 'Error creating invoice' });
    } finally {
        client.release();
    }
});

app.post('/api/quotes/:id/convert-to-invoice', async (req, res) => {
    const { id } = req.params;
    
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM quotes q
            LEFT JOIN customers c ON q.customer_id = c.id
            WHERE q.id = $1
        `, [id]);
        
        if (quoteResult.rows.length === 0) {
            await client.query('ROLLBACK');
            return res.status(404).json({ error: 'Quote not found' });
        }
        
        const quote = quoteResult.rows[0];
        
        const itemsResult = await pool.query(
            'SELECT * FROM quote_items WHERE quote_id = $1 ORDER BY item_order',
            [id]
        );
        
        const hasTBD = itemsResult.rows.some(item => 
            item.rate.toUpperCase() === 'TBD' || item.amount.toUpperCase() === 'TBD'
        );
        
        if (hasTBD) {
            await client.query('ROLLBACK');
            return res.status(400).json({ error: 'Cannot convert quote with TBD items to invoice. Please update all TBD items first.' });
        }
        
        const invoice_number = await getNextInvoiceNumber();
        const invoiceDate = new Date().toISOString().split('T')[0];
        
        const invoiceResult = await client.query(
            `INSERT INTO invoices (invoice_number, customer_id, invoice_date, terms, auth_code, tax_exempt, tax_rate, subtotal, tax_amount, total, created_from_quote_id)
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11) RETURNING *`,
            [invoice_number, quote.customer_id, invoiceDate, 'Net 30', '', quote.tax_exempt, quote.tax_rate, quote.subtotal, quote.tax_amount, quote.total, id]
        );
        
        const invoiceId = invoiceResult.rows[0].id;
        
        for (let i = 0; i < itemsResult.rows.length; i++) {
            const item = itemsResult.rows[i];
            await client.query(
                'INSERT INTO invoice_items (invoice_id, quantity, description, rate, amount, item_order) VALUES ($1, $2, $3, $4, $5, $6)',
                [invoiceId, item.quantity, item.description, item.rate, item.amount, i]
            );
        }
        
        await client.query('COMMIT');
        res.json(invoiceResult.rows[0]);
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error converting quote to invoice:', error);
        res.status(500).json({ error: 'Error converting quote to invoice' });
    } finally {
        client.release();
    }
});

app.put('/api/invoices/:id', async (req, res) => {
    const { id } = req.params;
    const { customer_id, invoice_date, terms, auth_code, tax_exempt, items } = req.body;
    
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        let subtotal = 0;
        
        for (const item of items) {
            const amount = parseFloat(item.amount.replace(/[$,]/g, ''));
            if (!isNaN(amount)) {
                subtotal += amount;
            }
        }
        
        const tax_rate = 8.25;
        const tax_amount = tax_exempt ? 0 : (subtotal * tax_rate / 100);
        const total = subtotal + tax_amount;
        
        await client.query(
            `UPDATE invoices SET customer_id = $1, invoice_date = $2, terms = $3, auth_code = $4, tax_exempt = $5, 
             tax_rate = $6, subtotal = $7, tax_amount = $8, total = $9, updated_at = CURRENT_TIMESTAMP
             WHERE id = $10`,
            [customer_id, invoice_date, terms, auth_code, tax_exempt, tax_rate, subtotal, tax_amount, total, id]
        );
        
        await client.query('DELETE FROM invoice_items WHERE invoice_id = $1', [id]);
        
        for (let i = 0; i < items.length; i++) {
            await client.query(
                'INSERT INTO invoice_items (invoice_id, quantity, description, rate, amount, item_order) VALUES ($1, $2, $3, $4, $5, $6)',
                [id, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i]
            );
        }
        
        await client.query('COMMIT');
        res.json({ success: true });
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error updating invoice:', error);
        res.status(500).json({ error: 'Error updating invoice' });
    } finally {
        client.release();
    }
});

app.delete('/api/invoices/:id', async (req, res) => {
    const { id } = req.params;
    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        await client.query('DELETE FROM invoice_items WHERE invoice_id = $1', [id]);
        await client.query('DELETE FROM invoices WHERE id = $1', [id]);
        await client.query('COMMIT');
        res.json({ success: true });
    } catch (error) {
        await client.query('ROLLBACK');
        console.error('Error deleting invoice:', error);
        res.status(500).json({ error: 'Error deleting invoice' });
    } finally {
        client.release();
    }
});

// PDF Generation using templates and persistent browser
app.get('/api/quotes/:id/pdf', async (req, res) => {
    const { id } = req.params;
    
    console.log(`[PDF] Starting quote PDF generation for ID: ${id}`);
    
    try {
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM quotes q
            LEFT JOIN customers c ON q.customer_id = c.id
            WHERE q.id = $1
        `, [id]);
        
        if (quoteResult.rows.length === 0) {
            return res.status(404).json({ error: 'Quote not found' });
        }
        
        const quote = quoteResult.rows[0];
        const itemsResult = await pool.query(
            'SELECT * FROM quote_items WHERE quote_id = $1 ORDER BY item_order',
            [id]
        );
        
        // Load template and replace placeholders
        const templatePath = path.join(__dirname, 'templates', 'quote-template.html');
        let html = await fs.readFile(templatePath, 'utf-8');
        
        // Get logo
        let logoHTML = '';
        try {
            const logoPath = path.join(__dirname, 'public', 'uploads', 'company-logo.png');
            const logoData = await fs.readFile(logoPath);
            const logoBase64 = logoData.toString('base64');
            logoHTML = `<img src="data:image/png;base64,${logoBase64}" alt="Company Logo" class="logo logo-size">`;
        } catch (err) {
            // No logo
        }
        
        // Generate items HTML
        let itemsHTML = itemsResult.rows.map(item => {
            let rateFormatted = item.rate;
            if (item.rate.toUpperCase() !== 'TBD' && !item.rate.includes('/')) {
                const rateNum = parseFloat(item.rate.replace(/[^0-9.]/g, ''));
                if (!isNaN(rateNum)) {
                    rateFormatted = rateNum.toFixed(2);
                }
            }
            return `
            <tr>
                <td class="qty">${item.quantity}</td>
                <td class="description">${item.description}</td>
                <td class="rate">${rateFormatted}</td>
                <td class="amount">${item.amount}</td>
            </tr>
            `;
        }).join('');
        
        // Add totals
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Subtotal:</td>
                <td class="total-amount">$${parseFloat(quote.subtotal).toFixed(2)}</td>
            </tr>`;
        
        if (!quote.tax_exempt) {
            itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Tax (${quote.tax_rate}%):</td>
                <td class="total-amount">$${parseFloat(quote.tax_amount).toFixed(2)}</td>
            </tr>`;
        }
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">TOTAL:</td>
                <td class="total-amount">$${parseFloat(quote.total).toFixed(2)}</td>
            </tr>
            <tr class="footer-row">
                <td colspan="4" class="thank-you">Thank you for your business!</td>
            </tr>`;
        
        let tbdNote = '';
        if (quote.has_tbd) {
            tbdNote = '<p style="font-size: 12px; margin-top: 20px;"><em>* Note: This quote contains items marked as "TBD" (To Be Determined). The final total may vary once all details are finalized.</em></p>';
        }
        
        // Replace placeholders
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', quote.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', quote.street || '')
            .replace('{{CUSTOMER_CITY}}', quote.city || '')
            .replace('{{CUSTOMER_STATE}}', quote.state || '')
            .replace('{{CUSTOMER_ZIP}}', quote.zip_code || '')
            .replace('{{QUOTE_NUMBER}}', quote.quote_number)
            .replace('{{ACCOUNT_NUMBER}}', quote.account_number || '')
            .replace('{{QUOTE_DATE}}', formatDate(quote.quote_date))
            .replace('{{ITEMS}}', itemsHTML)
            .replace('{{TBD_NOTE}}', tbdNote);
        
        // Use persistent browser
        const browserInstance = await initBrowser();
        const page = await browserInstance.newPage();
        
        await page.setContent(html, { waitUntil: 'networkidle0', timeout: 60000 });
        
        const pdf = await page.pdf({
            format: 'Letter',
            printBackground: true,
            margin: { top: '0.5in', right: '0.5in', bottom: '0.5in', left: '0.5in' },
            timeout: 60000
        });
        
        await page.close(); // Close page, not browser
        
        res.set({
            'Content-Type': 'application/pdf',
            'Content-Length': pdf.length,
            'Content-Disposition': `attachment; filename="Quote-${quote.quote_number}.pdf"`
        });
        res.end(pdf, 'binary');
        console.log('[PDF] Quote PDF sent successfully');
        
    } catch (error) {
        console.error('[PDF] ERROR:', error);
        res.status(500).json({ error: 'Error generating PDF', details: error.message });
    }
});

app.get('/api/invoices/:id/pdf', async (req, res) => {
    const { id } = req.params;
    
    console.log(`[INVOICE-PDF] Starting invoice PDF generation for ID: ${id}`);
    
    try {
        const invoiceResult = await pool.query(`
            SELECT i.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM invoices i
            LEFT JOIN customers c ON i.customer_id = c.id
            WHERE i.id = $1
        `, [id]);
        
        if (invoiceResult.rows.length === 0) {
            return res.status(404).json({ error: 'Invoice not found' });
        }
        
        const invoice = invoiceResult.rows[0];
        const itemsResult = await pool.query(
            'SELECT * FROM invoice_items WHERE invoice_id = $1 ORDER BY item_order',
            [id]
        );
        
        // Load template
        const templatePath = path.join(__dirname, 'templates', 'invoice-template.html');
        let html = await fs.readFile(templatePath, 'utf-8');
        
        // Get logo
        let logoHTML = '';
        try {
            const logoPath = path.join(__dirname, 'public', 'uploads', 'company-logo.png');
            const logoData = await fs.readFile(logoPath);
            const logoBase64 = logoData.toString('base64');
            logoHTML = `<img src="data:image/png;base64,${logoBase64}" alt="Company Logo" class="logo logo-size">`;
        } catch (err) {
            // No logo
        }
        
        // Generate items HTML
        let itemsHTML = itemsResult.rows.map(item => {
            let rateFormatted = item.rate;
            if (item.rate.toUpperCase() !== 'TBD' && !item.rate.includes('/')) {
                const rateNum = parseFloat(item.rate.replace(/[^0-9.]/g, ''));
                if (!isNaN(rateNum)) {
                    rateFormatted = rateNum.toFixed(2);
                }
            }
            return `
            <tr>
                <td class="qty">${item.quantity}</td>
                <td class="description">${item.description}</td>
                <td class="rate">${rateFormatted}</td>
                <td class="amount">${item.amount}</td>
            </tr>
            `;
        }).join('');
        
        // Add totals
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Subtotal:</td>
                <td class="total-amount">$${parseFloat(invoice.subtotal).toFixed(2)}</td>
            </tr>`;
        
        if (!invoice.tax_exempt) {
            itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Tax (${invoice.tax_rate}%):</td>
                <td class="total-amount">$${parseFloat(invoice.tax_amount).toFixed(2)}</td>
            </tr>`;
        }
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">TOTAL:</td>
                <td class="total-amount">$${parseFloat(invoice.total).toFixed(2)}</td>
            </tr>
            <tr class="footer-row">
                <td colspan="4" class="thank-you">Thank you for your business!</td>
            </tr>`;
        
        // Authorization field
        const authHTML = invoice.auth_code ? 
            `<p style="margin-bottom: 20px; font-size: 13px;"><strong>Authorization:</strong> ${invoice.auth_code}</p>` : '';
        
        // Replace placeholders
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', invoice.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', invoice.street || '')
            .replace('{{CUSTOMER_CITY}}', invoice.city || '')
            .replace('{{CUSTOMER_STATE}}', invoice.state || '')
            .replace('{{CUSTOMER_ZIP}}', invoice.zip_code || '')
            .replace('{{INVOICE_NUMBER}}', invoice.invoice_number)
            .replace('{{ACCOUNT_NUMBER}}', invoice.account_number || '')
            .replace('{{INVOICE_DATE}}', formatDate(invoice.invoice_date))
            .replace('{{TERMS}}', invoice.terms)
            .replace('{{AUTHORIZATION}}', authHTML)
            .replace('{{ITEMS}}', itemsHTML);
        
        // Use persistent browser
        const browserInstance = await initBrowser();
        const page = await browserInstance.newPage();
        
        await page.setContent(html, { waitUntil: 'networkidle0', timeout: 60000 });
        
        const pdf = await page.pdf({
            format: 'Letter',
            printBackground: true,
            margin: { top: '0.5in', right: '0.5in', bottom: '0.5in', left: '0.5in' },
            timeout: 60000
        });
        
        await page.close(); // Close page, not browser
        
        res.set({
            'Content-Type': 'application/pdf',
            'Content-Length': pdf.length,
            'Content-Disposition': `attachment; filename="Invoice-${invoice.invoice_number}.pdf"`
        });
        res.end(pdf, 'binary');
        console.log('[INVOICE-PDF] Invoice PDF sent successfully');
        
    } catch (error) {
        console.error('[INVOICE-PDF] ERROR:', error);
        res.status(500).json({ error: 'Error generating PDF', details: error.message });
    }
});


// Nach den PDF-Endpoints, vor "Start server", einfügen:

// HTML Debug Endpoints
app.get('/api/quotes/:id/html', async (req, res) => {
    const { id } = req.params;
    
    try {
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM quotes q
            LEFT JOIN customers c ON q.customer_id = c.id
            WHERE q.id = $1
        `, [id]);
        
        if (quoteResult.rows.length === 0) {
            return res.status(404).json({ error: 'Quote not found' });
        }
        
        const quote = quoteResult.rows[0];
        const itemsResult = await pool.query(
            'SELECT * FROM quote_items WHERE quote_id = $1 ORDER BY item_order',
            [id]
        );
        
        const templatePath = path.join(__dirname, 'templates', 'quote-template.html');
        let html = await fs.readFile(templatePath, 'utf-8');
        
        let logoHTML = '';
        try {
            const logoPath = path.join(__dirname, 'public', 'uploads', 'company-logo.png');
            const logoData = await fs.readFile(logoPath);
            const logoBase64 = logoData.toString('base64');
            logoHTML = `<img src="data:image/png;base64,${logoBase64}" alt="Company Logo" class="logo logo-size">`;
        } catch (err) {}
        
        let itemsHTML = itemsResult.rows.map(item => {
            let rateFormatted = item.rate;
            if (item.rate.toUpperCase() !== 'TBD' && !item.rate.includes('/')) {
                const rateNum = parseFloat(item.rate.replace(/[^0-9.]/g, ''));
                if (!isNaN(rateNum)) {
                    rateFormatted = rateNum.toFixed(2);
                }
            }
            return `
            <tr>
                <td class="qty">${item.quantity}</td>
                <td class="description">${item.description}</td>
                <td class="rate">${rateFormatted}</td>
                <td class="amount">${item.amount}</td>
            </tr>
            `;
        }).join('');
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Subtotal:</td>
                <td class="total-amount">$${parseFloat(quote.subtotal).toFixed(2)}</td>
            </tr>`;
        
        if (!quote.tax_exempt) {
            itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Tax (${quote.tax_rate}%):</td>
                <td class="total-amount">$${parseFloat(quote.tax_amount).toFixed(2)}</td>
            </tr>`;
        }
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">TOTAL:</td>
                <td class="total-amount">$${parseFloat(quote.total).toFixed(2)}</td>
            </tr>
            <tr class="footer-row">
                <td colspan="4" class="thank-you">Thank you for your business!</td>
            </tr>`;
        
        let tbdNote = '';
        if (quote.has_tbd) {
            tbdNote = '<p style="font-size: 12px; margin-top: 20px;"><em>* Note: This quote contains items marked as "TBD" (To Be Determined). The final total may vary once all details are finalized.</em></p>';
        }
        
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', quote.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', quote.street || '')
            .replace('{{CUSTOMER_CITY}}', quote.city || '')
            .replace('{{CUSTOMER_STATE}}', quote.state || '')
            .replace('{{CUSTOMER_ZIP}}', quote.zip_code || '')
            .replace('{{QUOTE_NUMBER}}', quote.quote_number)
            .replace('{{ACCOUNT_NUMBER}}', quote.account_number || '')
            .replace('{{QUOTE_DATE}}', formatDate(quote.quote_date))
            .replace('{{ITEMS}}', itemsHTML)
            .replace('{{TBD_NOTE}}', tbdNote);
        
        res.setHeader('Content-Type', 'text/html');
        res.send(html);
        
    } catch (error) {
        console.error('[HTML] ERROR:', error);
        res.status(500).json({ error: 'Error generating HTML' });
    }
});

app.get('/api/invoices/:id/html', async (req, res) => {
    const { id } = req.params;
    
    try {
        const invoiceResult = await pool.query(`
            SELECT i.*, c.name as customer_name, c.street, c.city, c.state, c.zip_code, c.account_number
            FROM invoices i
            LEFT JOIN customers c ON i.customer_id = c.id
            WHERE i.id = $1
        `, [id]);
        
        if (invoiceResult.rows.length === 0) {
            return res.status(404).json({ error: 'Invoice not found' });
        }
        
        const invoice = invoiceResult.rows[0];
        const itemsResult = await pool.query(
            'SELECT * FROM invoice_items WHERE invoice_id = $1 ORDER BY item_order',
            [id]
        );
        
        const templatePath = path.join(__dirname, 'templates', 'invoice-template.html');
        let html = await fs.readFile(templatePath, 'utf-8');
        
        let logoHTML = '';
        try {
            const logoPath = path.join(__dirname, 'public', 'uploads', 'company-logo.png');
            const logoData = await fs.readFile(logoPath);
            const logoBase64 = logoData.toString('base64');
            logoHTML = `<img src="data:image/png;base64,${logoBase64}" alt="Company Logo" class="logo logo-size">`;
        } catch (err) {}
        
        let itemsHTML = itemsResult.rows.map(item => {
            let rateFormatted = item.rate;
            if (item.rate.toUpperCase() !== 'TBD' && !item.rate.includes('/')) {
                const rateNum = parseFloat(item.rate.replace(/[^0-9.]/g, ''));
                if (!isNaN(rateNum)) {
                    rateFormatted = rateNum.toFixed(2);
                }
            }
            return `
            <tr>
                <td class="qty">${item.quantity}</td>
                <td class="description">${item.description}</td>
                <td class="rate">${rateFormatted}</td>
                <td class="amount">${item.amount}</td>
            </tr>
            `;
        }).join('');
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Subtotal:</td>
                <td class="total-amount">$${parseFloat(invoice.subtotal).toFixed(2)}</td>
            </tr>`;
        
        if (!invoice.tax_exempt) {
            itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">Tax (${invoice.tax_rate}%):</td>
                <td class="total-amount">$${parseFloat(invoice.tax_amount).toFixed(2)}</td>
            </tr>`;
        }
        
        itemsHTML += `
            <tr class="footer-row">
                <td colspan="3" class="total-label">TOTAL:</td>
                <td class="total-amount">$${parseFloat(invoice.total).toFixed(2)}</td>
            </tr>
            <tr class="footer-row">
                <td colspan="4" class="thank-you">Thank you for your business!</td>
            </tr>`;
        
        const authHTML = invoice.auth_code ? 
            `<p style="margin-bottom: 20px; font-size: 13px;"><strong>Authorization:</strong> ${invoice.auth_code}</p>` : '';
        
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', invoice.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', invoice.street || '')
            .replace('{{CUSTOMER_CITY}}', invoice.city || '')
            .replace('{{CUSTOMER_STATE}}', invoice.state || '')
            .replace('{{CUSTOMER_ZIP}}', invoice.zip_code || '')
            .replace('{{INVOICE_NUMBER}}', invoice.invoice_number)
            .replace('{{ACCOUNT_NUMBER}}', invoice.account_number || '')
            .replace('{{INVOICE_DATE}}', formatDate(invoice.invoice_date))
            .replace('{{TERMS}}', invoice.terms)
            .replace('{{AUTHORIZATION}}', authHTML)
            .replace('{{ITEMS}}', itemsHTML);
        
        res.setHeader('Content-Type', 'text/html');
        res.send(html);
        
    } catch (error) {
        console.error('[HTML] ERROR:', error);
        res.status(500).json({ error: 'Error generating HTML' });
    }
});


// Start server and browser
async function startServer() {
    await initBrowser();
    
    app.listen(PORT, () => {
        console.log(`Quote System running on port ${PORT}`);
    });
}

startServer();

// Graceful shutdown
process.on('SIGTERM', async () => {
    if (browser) {
        await browser.close();
    }
    await pool.end();
    process.exit(0);
});