server.js

require('dotenv').config();

const express = require('express');
const mongoose = require('mongoose');
const cors = require('cors');
const vehicleRoutes = require('./routes/vehicleRoutes');
const errorHandler = require('./middleware/errorHandler');

const app = express();

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

if (!MONGO_URI) {
  console.error('Missing MONGO_URI. Copy .env.example to .env before starting the server.');
  process.exit(1);
}

if (!process.env.JWT_SECRET) {
  console.warn('Warning: JWT_SECRET is not set. Copy .env.example to .env before starting the server.');
}

const allowedOrigins = ['http://localhost:5173', 'http://127.0.0.1:5173'];

const corsOptions = {
  origin: (origin, callback) => {
    if (!origin || allowedOrigins.includes(origin)) {
      return callback(null, true);
    }

    return callback(new Error(`CORS policy: origin ${origin} is not allowed`));
  },
  methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization'],
  credentials: true,
};

app.use(cors(corsOptions));
app.use(express.json());

app.use('/api/vehicles', vehicleRoutes);

app.use((req, res) => {
  res.status(404).json({ message: 'Route not found' });
});

app.use(errorHandler);

mongoose
  .connect(MONGO_URI)
  .then(() => {
    console.log('Successfully connected to MongoDB');

    app.listen(PORT, () => {
      console.log(`Server is running on port ${PORT}`);
    });
  })
  .catch((error) => {
    console.error('Database connection error:', error.message);
    process.exit(1);
  });

module.exports = app;