/**
 * Quote Routes
 * Handles quote CRUD operations and PDF generation
 */
const express = require('express');
const router = express.Router();
const path = require('path');
const fs = require('fs').promises;
const { pool } = require('../config/database');
const { getNextQuoteNumber } = require('../utils/numberGenerators');
const { formatDate, formatMoney } = require('../utils/helpers');
const { getBrowser, generatePdfFromHtml, getLogoHtml, renderQuoteItems, formatAddressLines } = require('../services/pdf-service');

// GET all quotes
router.get('/', 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' });
    }
});

// GET single quote
router.get('/:id', async (req, res) => {
    const { id } = req.params;
    try {
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.line1, c.line2, c.line3, c.line4, 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' });
    }
});

// POST create quote
router.post('/', 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, qbo_item_id) VALUES ($1, $2, $3, $4, $5, $6, $7)',
                [quoteId, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i, items[i].qbo_item_id || '9']
            );
        }
        
        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();
    }
});

// PUT update quote
router.put('/: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, qbo_item_id) VALUES ($1, $2, $3, $4, $5, $6, $7)',
                [id, items[i].quantity, items[i].description, items[i].rate, items[i].amount, i, items[i].qbo_item_id || '9']
            );
        }
        
        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();
    }
});

// DELETE quote
router.delete('/: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();
    }
});

// GET quote PDF
router.get('/: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.line1, c.line2, c.line3, c.line4, 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');
        
        const logoHTML = await getLogoHtml();
        const itemsHTML = renderQuoteItems(itemsResult.rows, quote);
        
        let tbdNote = quote.has_tbd ? '<p style="font-size: 12px; margin-top: 20px;"><em>* Note: This quote contains items marked as "TBD". The final total may vary.</em></p>' : '';
        
        const streetBlock = formatAddressLines(quote.line1, quote.line2, quote.line3, quote.line4, quote.customer_name);
        
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', quote.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', streetBlock)
            .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);

        const pdf = await generatePdfFromHtml(html);
        
        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 });
    }
});

// GET quote HTML (debug)
router.get('/:id/html', async (req, res) => {
    const { id } = req.params;
    
    try {
        const quoteResult = await pool.query(`
            SELECT q.*, c.name as customer_name, c.line1, c.line2, c.line3, c.line4, 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');
        
        const logoHTML = await getLogoHtml();
        const itemsHTML = renderQuoteItems(itemsResult.rows, quote);
        
        let tbdNote = quote.has_tbd ? '<p style="font-size: 12px; margin-top: 20px;"><em>* Note: This quote contains items marked as "TBD". The final total may vary.</em></p>' : '';
        
        const streetBlock = formatAddressLines(quote.line1, quote.line2, quote.line3, quote.line4, quote.customer_name);
        
        html = html
            .replace('{{LOGO_HTML}}', logoHTML)
            .replace('{{CUSTOMER_NAME}}', quote.customer_name || '')
            .replace('{{CUSTOMER_STREET}}', streetBlock)
            .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' });
    }
});

// POST convert quote to invoice
router.post('/: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.line1, c.line2, c.line3, c.line4, 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 = null; 
        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, qbo_item_id) VALUES ($1, $2, $3, $4, $5, $6, $7)',
                [invoiceId, item.quantity, item.description, item.rate, item.amount, i, item.qbo_item_id || '9']
            );
        }
        
        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();
    }
});

module.exports = router;