import express from 'express';
import cors from 'cors';
import dotenv from 'dotenv';
import mongoose from 'mongoose';
import session from 'express-session';
import MongoStore from 'connect-mongo';
import authRoutes from './routes/auth.js';
import volunteerRoutes from './routes/volunteer.js';

dotenv.config();

const app = express();

// CORS configuration
app.use(cors({
  origin: ['http://localhost:5173', 'http://127.0.0.1:5173'],
  credentials: true,
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Accept', 'Authorization'],
}));

app.use(express.json());

// Connect to MongoDB Atlas
mongoose.connect(process.env.MONGODB_URI)
  .then(() => {
    console.log('Connected to MongoDB Atlas successfully');
  })
  .catch((err) => {
    console.error('MongoDB Atlas connection error:', err);
    process.exit(1);
  });

// Session configuration with MongoDB Atlas store
app.use(session({
  secret: process.env.SESSION_SECRET || 'your-secret-key',
  resave: false,
  saveUninitialized: false,
  store: MongoStore.create({
    mongoUrl: process.env.MONGODB_URI,
    ttl: 24 * 60 * 60, // 1 day
  }),
  cookie: {
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: 24 * 60 * 60 * 1000, // 1 day
    httpOnly: true,
  },
}));

// Middleware to attach user to request
app.use(async (req, res, next) => {
  if (req.session.userId) {
    try {
      const user = await mongoose.model('User').findById(req.session.userId);
      req.user = user;
    } catch (error) {
      console.error('Error fetching user:', error);
    }
  }
  next();
});

// Mount routes
app.use('/auth', authRoutes);
app.use('/volunteer', volunteerRoutes);

// Error handling middleware
app.use((err, req, res, next) => {
  console.error('Error:', err);
  res.status(500).json({ 
    error: 'Something went wrong!',
    message: process.env.NODE_ENV === 'development' ? err.message : undefined
  });
});

const PORT = process.env.PORT || 5000;

app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

mongoose.connection.on('error', (err) => {
  console.error('MongoDB connection error:', err);
});