import express from 'express';
import path from 'path';
import { fileURLToPath } from 'url';
import seoMiddleware from './seo-middleware.js';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

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

// Configure MIME types for JSX files
app.use((req, res, next) => {
  if (req.path.endsWith('.jsx')) {
    res.setHeader('Content-Type', 'application/javascript');
  }
  next();
});

// Serve static assets FIRST (CSS, JS, images, fonts) - these MUST work
// CRITICAL: These must be BEFORE SEO middleware to prevent JS/CSS from being intercepted

// Block /src files in production - they should never be requested
// If requested, return 404 immediately to prevent SEO middleware from intercepting
app.use('/src', (req, res) => {
  res.status(404).setHeader('Content-Type', 'text/plain').send('Source files not available in production');
});

// Serve /assets (built files) - BOTH /assets and /home/assets
app.use('/assets', express.static(path.join(__dirname, '../dist/assets')));
app.use('/home/assets', express.static(path.join(__dirname, '../dist/assets')));

// Serve /og images - BOTH /og and /home/og
app.use('/og', express.static(path.join(__dirname, '../dist/og')));
app.use('/home/og', express.static(path.join(__dirname, '../dist/og')));

// Serve favicon and other root files for /home/ paths
app.use('/home/PozoAppFavicon.png', express.static(path.join(__dirname, '../dist/PozoAppFavicon.png')));
app.use('/home/fav.ico', express.static(path.join(__dirname, '../dist/fav.ico')));
app.use('/home/manifest.json', express.static(path.join(__dirname, '../dist/manifest.json')));

// Serve all other static files from dist (but NOT index.html)
app.use(express.static(path.join(__dirname, '../dist'), {
  index: false, // Don't serve index.html automatically
  setHeaders: (res, filePath) => {
    // Set correct MIME types
    if (filePath.endsWith('.css')) {
      res.setHeader('Content-Type', 'text/css');
    } else if (filePath.endsWith('.js')) {
      res.setHeader('Content-Type', 'application/javascript');
    } else if (filePath.endsWith('.html')) {
      res.status(404).end();
      return;
    }
  }
}));

// CRITICAL: Explicit handler for /src/ requests - prevent them from reaching SEO middleware
// If static middleware didn't serve it, return 404 instead of falling through
app.use('/src', (req, res, next) => {
  // If we reach here, the static middleware didn't find the file
  // Return 404 instead of letting it fall through to SEO middleware
  res.status(404).setHeader('Content-Type', 'text/plain').send('File not found');
});

// 301 Redirects Middleware - SAFE ADDITION (no removal)
// Handles duplicate URLs, trailing slashes, and old URL redirects
app.use((req, res, next) => {
  const url = req.url;
  const host = req.headers.host || '';
  
  // Force HTTPS redirect (if not already HTTPS)
  if (req.protocol !== 'https' && process.env.NODE_ENV === 'production') {
    return res.redirect(301, `https://${host}${url}`);
  }
  
  // Remove trailing slash (except for root and directories)
  if (url.length > 1 && url.endsWith('/') && !url.includes('.')) {
    return res.redirect(301, url.slice(0, -1));
  }
  
  // Normalize /home/* to /* (if needed after migration)
  // Commented out for now - uncomment when ready to remove /home prefix
  // if (url.startsWith('/home/') && url !== '/home/') {
  //   return res.redirect(301, url.replace('/home', ''));
  // }
  
  // Old URL redirects (add more as needed)
  const redirectMap = {
    '/pricing-pozoapp': '/pricing',
    '/home/pricing-pozoapp': '/pricing',
    '/home/pricing-pozoapp/': '/pricing',
  };
  
  if (redirectMap[url]) {
    return res.redirect(301, redirectMap[url]);
  }
  
  next();
});

// CRITICAL: Apply SEO middleware AFTER static files and redirects
// This ensures HTML requests go through SEO middleware
// But static assets are served first
app.use(seoMiddleware);

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
  console.log('Dynamic SEO enabled!');
});

export default app;