// Load environment variables
require('dotenv').config();

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

// Route handlers
const departuresRouter = require('./server/routes/departures');
const sitesRouter = require('./server/routes/sites');
const configRouter = require('./server/routes/config');

const PORT = process.env.PORT || 3002;

// Default configuration
let config = {
  sites: [
    {
      id: '1411',
      name: 'Ambassaderna',
      enabled: true
    }
  ]
};

// Function to load configuration from file
function loadSitesConfig() {
  try {
    const fs = require('fs');
    const configPath = path.join('config', 'sites.json');
    if (fs.existsSync(configPath)) {
      const configData = fs.readFileSync(configPath, 'utf8');
      const loadedConfig = JSON.parse(configData);
      
      // Handle old format (array of sites)
      if (Array.isArray(loadedConfig)) {
        config.sites = loadedConfig;
      } else {
        config = loadedConfig;
      }
      
      console.log('Loaded configuration:', config);
    }
  } catch (error) {
    console.error('Error loading configuration:', error);
  }
}

// Load configuration on startup
loadSitesConfig();

// Create HTTP server
const server = http.createServer(async (req, res) => {
  const parsedUrl = new URL(req.url, `http://${req.headers.host || 'localhost'}`);
  
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
  
  if (req.method === 'OPTIONS') {
    res.writeHead(204);
    res.end();
    return;
  }

  // Handle API endpoints - use route handlers
  if (parsedUrl.pathname === '/api/departures') {
    await departuresRouter.handleDepartures(req, res, config);
  }
  else if (parsedUrl.pathname === '/api/sites/search') {
    sitesRouter.handleSiteSearch(req, res, parsedUrl);
  }
  else if (parsedUrl.pathname === '/api/sites/nearby') {
    await sitesRouter.handleNearbySites(req, res, parsedUrl);
  }
  else if (parsedUrl.pathname === '/api/config') {
    configRouter.handleGetConfig(req, res, config);
  }
  else if (parsedUrl.pathname === '/api/config/update' && req.method === 'POST') {
    configRouter.handleUpdateConfig(req, res, config);
  }
  else if (parsedUrl.pathname === '/api/config/client') {
    configRouter.handleClientConfig(req, res);
  }
  // Serve static files
  else if (parsedUrl.pathname === '/' || parsedUrl.pathname === '/index.html') {
    fs.readFile('index.html', 'utf8', (err, data) => {
      if (err) {
        res.writeHead(500, { 'Content-Type': 'text/plain' });
        res.end('Error loading index.html');
        return;
      }
      // Always inject API key and config into HTML (even if empty, so window vars exist)
      const apiKey = process.env.OPENWEATHERMAP_API_KEY || '';
      if (!data.includes('window.OPENWEATHERMAP_API_KEY')) {
        // Inject before closing </head> tag
        const configScript = `
    <script>
        window.OPENWEATHERMAP_API_KEY = '${apiKey.replace(/'/g, "\\'")}';
        window.DEFAULT_LOCATION = {
            latitude: ${parseFloat(process.env.DEFAULT_LATITUDE) || 59.3293},
            longitude: ${parseFloat(process.env.DEFAULT_LONGITUDE) || 18.0686},
            name: '${(process.env.DEFAULT_LOCATION_NAME || 'Stockholm').replace(/'/g, "\\'")}'
        };
    </script>`;
        data = data.replace('</head>', configScript + '\n</head>');
      }
      res.writeHead(200, { 'Content-Type': 'text/html' });
      res.end(data);
    });
  }
  // Serve static files from public directory or root
  else if (/\.(js|css|png|jpg|jpeg|gif|ico|svg|json)$/.test(parsedUrl.pathname)) {
    let filePath = parsedUrl.pathname.substring(1); // Remove leading /
    
    // Try public directory first, then root directory for backward compatibility
    const publicPath = path.join('public', filePath);
    const rootPath = filePath;
    
    // Check if file exists in public directory first
    fs.access(publicPath, fs.constants.F_OK, (publicErr) => {
      const targetPath = publicErr ? rootPath : publicPath;
      
      fs.readFile(targetPath, (err, data) => {
        if (err) {
          res.writeHead(404, { 'Content-Type': 'text/plain' });
          res.end('File not found');
          return;
        }
        
        const ext = parsedUrl.pathname.split('.').pop();
        const contentType = {
          'js': 'text/javascript',
          'css': 'text/css',
          'png': 'image/png',
          'jpg': 'image/jpeg',
          'jpeg': 'image/jpeg',
          'gif': 'image/gif',
          'ico': 'image/x-icon',
          'svg': 'image/svg+xml',
          'json': 'application/json'
        }[ext] || 'text/plain';
        
        res.writeHead(200, { 'Content-Type': contentType });
        res.end(data);
      });
    });
  }
  else {
    res.writeHead(404, { 'Content-Type': 'text/plain' });
    res.end('Not Found');
  }
});

// Start the server
server.listen(PORT, () => {
  console.log(`Server running at http://localhost:${PORT}/`);
});