import User from "../models/userModel.js";
import jwt from "jsonwebtoken";

// Generate JWT
const generateToken = (id) => {
  return jwt.sign({ id }, process.env.JWT_SECRET, {
    expiresIn: "30d",
  });
};

// @desc    Register a new user
// @route   POST /api/users
// @access  Public
const registerUser = async (req, res) => {
  const { name, email, password } = req.body;

  try {
    const userExists = await User.findOne({ email });

    if (userExists) {
      res.status(400).json({ msg: "User already exists" });
      return;
    }

    const user = await User.create({
      name,
      email,
      password,
    });

    if (user) {
      res.status(201).json({
        _id: user._id,
        name: user.name,
        email: user.email,
        token: generateToken(user._id),
      });
    } else {
      res.status(400).json({ msg: "Invalid user data" });
    }
  } catch (error) {
    res.status(500).json({ msg: error.message });
  }
};

// @desc    Auth user & get token (Login)
// @route   POST /api/users/login
// @access  Public
const loginUser = async (req, res) => {
  const { email, password } = req.body;

  try {
    const user = await User.findOne({ email });

    if (user && (await user.matchPassword(password))) {
      res.json({
        _id: user._id,
        name: user.name,
        email: user.email,
        token: generateToken(user._id),
      });
    } else {
      res.status(401).json({ msg: "Invalid email or password" });
    }
  } catch (error) {
    res.status(500).json({ msg: error.message });
  }
};

export { registerUser, loginUser };