const asyncHandler = require("express-async-handler");
const bcrypt = require("bcryptjs");
const jwt = require("jsonwebtoken");
const User = require("../models/userModel");

// @desc Register a new user
// @route /api/users
// @access Public
const registerUser = asyncHandler(async (req, res) => {
  const { name, email, password } = req.body;
  if (!name || !email || !password) {
    res.status(400);
    throw new Error("Please include all fields");
  }
  const userExists = await User.findOne({ email });

  if (userExists) {
    res.status(400);
    throw new Error("User already exists");
  }
  const salt = await bcrypt.genSalt(10);
  const hashedPassword = await bcrypt.hash(password, salt);
  const user = await User.create({
    name,
    email,
    password: hashedPassword,
  });

  if (user) {
    res.status(201).json({
      _id: user._id,
      name: user.name,
      email: user.email,
      token: generateToken(user._id),
    });
  } else {
    res.status(400);
    throw new error("Inavalid user data");
  }
});

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

  const user = await User.findOne({ email });
  if (user && (await bcrypt.compare(password, user.password))) {
    res.status(200).json({
      _id: user._id,
      name: user.name,
      email: user.email,
      token: generateToken(user._id),
    });
  } else {
    res.status(401);
    throw new Error("Inavalid credentials");
  }
});
// @desc Get current user
// @route /api/users/me
// @access Private
const getMe = asyncHandler(async (req, res) => {
  const user = {
    id:req.user._id,
    email:req.user.email,
    name:req.user.name
  }
  res.status(200).json(user)
});
const generateToken = (id) => {
  return jwt.sign({ id }, process.env.JWT_SECRET, {
    expiresIn: "30d",
  });
};

module.exports = { registerUser, getMe, loginUser };