const express = require('express');
const path = require('path');
const fs = require('fs');

const app = express();
const PORT = process.env.PORT || 8888;

// Aggressive caching middleware for static assets
app.use((req, res, next) => {
    // Set cache headers based on file type
    const ext = path.extname(req.path).toLowerCase();
    
    // Images - cache for 1 year
    if (['.jpg', '.jpeg', '.png', '.gif', '.webp', '.svg', '.ico'].includes(ext)) {
        res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
    }
    // CSS/JS - cache for 1 month with revalidation
    else if (['.css', '.js'].includes(ext) && !req.path.includes('animations.js')) {
        res.setHeader('Cache-Control', 'public, max-age=2592000, must-revalidate');
    }
    // HTML - cache for 1 hour with revalidation
    else if (ext === '.html' || req.path === '/') {
        res.setHeader('Cache-Control', 'public, max-age=3600, must-revalidate');
        res.setHeader('X-Content-Type-Options', 'nosniff');
    }
    // Fonts - cache for 1 year
    else if (['.woff', '.woff2', '.ttf', '.eot'].includes(ext)) {
        res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
    }
    
    // Add performance headers
    res.setHeader('X-Frame-Options', 'SAMEORIGIN');
    res.setHeader('X-XSS-Protection', '1; mode=block');
    
    next();
});

// Enable compression (install compression middleware: npm install compression)
// const compression = require('compression');
// app.use(compression());

// Serve static files from the current directory
app.use(express.static(__dirname, {
    etag: true,
    lastModified: true,
    setHeaders: (res, filePath) => {
        // Additional headers for specific files
        if (filePath.endsWith('.html')) {
            res.setHeader('X-Powered-By', 'Odoo Expertos');
        }
    }
}));

// Special handling for root route
app.get('/', (req, res) => {
    res.sendFile(path.join(__dirname, 'index.html'));
});

// Handle directory routes - serve the index.html file or directory listing
app.get('*', (req, res) => {
    const requestedPath = path.join(__dirname, req.path);
    
    // First check if the exact file exists (for static files)
    if (fs.existsSync(requestedPath) && fs.statSync(requestedPath).isFile()) {
        res.sendFile(requestedPath);
        return;
    }
    
    // Check if it's a directory
    if (fs.existsSync(requestedPath) && fs.statSync(requestedPath).isDirectory()) {
        const indexPath = path.join(requestedPath, 'index.html');
        if (fs.existsSync(indexPath)) {
            res.sendFile(indexPath);
        } else {
            res.status(404).send('Directory index not found');
        }
    } else {
        // Try to serve 404.html if it exists
        const notFoundPath = path.join(__dirname, '404.html');
        if (fs.existsSync(notFoundPath)) {
            res.status(404).sendFile(notFoundPath);
        } else {
            res.status(404).send('Page not found');
        }
    }
});

app.listen(PORT, () => {
    console.log(`
╔════════════════════════════════════════════════════════════╗
║                                                            ║
║   🚀 Odoo Expertos OPTIMIZED Server Running!              ║
║                                                            ║
║   Local URL: http://localhost:${PORT}                       ║
║                                                            ║
║   ✅ Caching enabled for static assets                     ║
║   ✅ Performance headers active                            ║
║                                                            ║
║   Press Ctrl+C to stop the server                          ║
║                                                            ║
╚════════════════════════════════════════════════════════════╝
    `);
    
    // Open browser automatically
    const opener = require('opener');
    opener(`http://localhost:${PORT}`);
});