/**
 * Datacenter Designer Server
 * Express application with modular routes
 */

const express = require('express');
const path = require('path');
const config = require('./config');
const db = require('./db');
const { errorHandler, notFoundHandler } = require('./lib/errorHandler');

// Import route modules
const projectsRouter = require('./routes/projects');
const racksRouter = require('./routes/racks');
const devicesRouter = require('./routes/devices');
const connectionsRouter = require('./routes/connections');

// Initialize Express app
const app = express();

// Middleware
app.use(express.json({ limit: config.api.jsonLimit }));
app.use(express.static(path.join(__dirname, '../public')));

// Optional: Request logging (development)
if (config.logging.enabled && config.server.env === 'development') {
  app.use((req, res, next) => {
    console.log(`${req.method} ${req.path}`);
    next();
  });
}

// API Routes
app.use('/api/projects', projectsRouter);
app.use('/api/racks', racksRouter);
app.use('/api/devices', devicesRouter);
app.use('/api/device-types', devicesRouter); // Mounted under /devices/types
app.use('/api/connections', connectionsRouter);

// Health check endpoint
app.get('/api/health', (req, res) => {
  const stats = db.getStats();
  res.json({
    status: 'ok',
    version: '1.0.0',
    database: stats
  });
});

// 404 handler - must be after all other routes
app.use(notFoundHandler);

// Error handler - must be last
app.use(errorHandler);

// Initialize database and start server
db.init();

app.listen(config.server.port, () => {
  console.log(`
╔═══════════════════════════════════════════════════════════╗
║                                                           ║
║        Datacenter Designer Server                         ║
║                                                           ║
║        Running on: http://${config.server.host}:${config.server.port}                  ║
║        Environment: ${config.server.env}                          ║
║                                                           ║
╚═══════════════════════════════════════════════════════════╝
  `);
});

// Graceful shutdown
process.on('SIGTERM', () => {
  console.log('SIGTERM signal received: closing HTTP server');
  db.close();
  process.exit(0);
});

process.on('SIGINT', () => {
  console.log('SIGINT signal received: closing HTTP server');
  db.close();
  process.exit(0);
});