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const express = require('express');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
const mongoose = require('mongoose');
const dotenv = require('dotenv');
const cors = require('cors');

dotenv.config();

const app = express();
app.use(express.json());
app.use(cors());

// MongoDB connection (replace with your MongoDB URI)
mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log('MongoDB connected'))
  .catch(err => console.log(err));

// User Schema
const userSchema = new mongoose.Schema({
  email: { type: String, required: true, unique: true },
  password: { type: String, required: true }
});

const User = mongoose.model('User', userSchema);

// Register API
app.post('/api/register', async (req, res) => {
  const { email, password } = req.body;

  try {
    // Check if the user already exists
    const existingUser = await User.findOne({ email });
    if (existingUser) {
      return res.status(400).json({ message: 'User already exists' });
    }

    // Hash the password
    const salt = await bcrypt.genSalt(10);
    const hashedPassword = await bcrypt.hash(password, salt);

    // Create a new user
    const newUser = new User({
      email,
      password: hashedPassword
    });

    await newUser.save();

    // Generate JWT
    const token = jwt.sign(
      { userId: newUser._id, email: newUser.email },
      process.env.JWT_SECRET,
      { expiresIn: '1h' }
    );

    res.status(201).json({ message: 'User registered successfully', token });
  } catch (err) {
    res.status(500).json({ message: 'Error registering user' });
  }
});

// Start the server
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(`Server running on port ${PORT}`));