const express = require('express');
const cors = require('cors');
const mysql = require('mysql2/promise');
const productsRouter = require('./routes/products');
const dashboardRouter = require('./routes/dashboard');
const ordersRouter = require('./routes/orders');
const csvRoutes = require('./routes/csv');

const app = express();

// Debug middleware to log all requests
app.use((req, res, next) => {
  console.log(`[App Debug] ${new Date().toISOString()} - ${req.method} ${req.path}`);
  next();
});

// Configure CORS with specific options
app.use(cors({
  origin: [
    'http://localhost:5173',           // Local development
    'https://inventory.kent.pw',       // Production frontend
    /\.kent\.pw$/                      // Any subdomain of kent.pw
  ],
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization'],
  credentials: true,
  optionsSuccessStatus: 200
}));

app.use(express.json());

// Database connection
const pool = mysql.createPool({
  host: process.env.DB_HOST || 'localhost',
  user: process.env.DB_USER || 'root',
  password: process.env.DB_PASSWORD || '',
  database: process.env.DB_NAME || 'inventory',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0
});

// Make db pool available in routes
app.locals.pool = pool;

// Debug endpoint to list all registered routes
app.get('/api/debug/routes', (req, res) => {
  console.log('Debug routes endpoint hit');
  const routes = [];
  app._router.stack.forEach(middleware => {
    if (middleware.route) {
      routes.push({
        path: middleware.route.path,
        methods: Object.keys(middleware.route.methods)
      });
    } else if (middleware.name === 'router') {
      middleware.handle.stack.forEach(handler => {
        if (handler.route) {
          const fullPath = (middleware.regexp.source === '^\\/?(?=\\/|$)' ? '' : middleware.regexp.source.replace(/\\\//g, '/').replace(/\^|\$/g, '')) + handler.route.path;
          routes.push({
            path: fullPath,
            methods: Object.keys(handler.route.methods)
          });
        }
      });
    }
  });
  res.json(routes);
});

// Test endpoint to verify server is running
app.get('/api/health', (req, res) => {
  res.json({ status: 'ok' });
});

// Mount all routes under /api
console.log('Mounting routes...');

console.log('Mounting products routes...');
app.use('/api/products', productsRouter);

console.log('Mounting dashboard routes...');
app.use('/api/dashboard', dashboardRouter);

console.log('Mounting orders routes...');
app.use('/api/orders', ordersRouter);

console.log('Mounting CSV routes...');
app.use('/api/csv', csvRoutes);
console.log('CSV routes mounted');

console.log('All routes mounted');

// Error handling middleware
app.use((err, req, res, next) => {
  console.error('Error:', err);
  res.status(500).json({ error: err.message });
});

// 404 handler
app.use((req, res) => {
  console.log('404 Not Found:', req.method, req.path);
  res.status(404).json({ error: 'Not Found' });
});

const PORT = process.env.PORT || 3010;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
  console.log('Available routes:');
  console.log('- GET  /api/health');
  console.log('- GET  /api/debug/routes');
  console.log('- GET  /api/csv/status');
  console.log('- GET  /api/csv/test');
  console.log('- POST /api/csv/update');
});