text: const { User } = require('../models');
  const { AuthenticationError } = require('apollo-server-express');
  const { signToken } = require('../utils/auth');
  
  const resolvers = {
      Query: {
          me: async (parent, args, context) => {
              if (context.user) {
                  const userData = await User.findOne({ _id: context.user._id })
                      .select('-__v');
  
                      return userData;
              }
  
              throw new AuthenticationError('Not logged in');
          }
      },
      Mutation: {
          login: async (parent, { email, password }) => {
              const user = await User.findOne({ email });
  
              if (!user) {
                  throw new AuthenticationError('Incorrect credentials');
              }
  
              const correctPw = await user.isCorrectPassword(password);
  
              if (!correctPw) {
                  throw new AuthenticationError('Incorrect credentials');
              }
  
              const token = signToken(user)
              return { token, user };
          },
          addUser: async (parent, args) => {
              const user = await User.create(args);
              const token = signToken(user);
  
              return { token, user }
          },
          saveBook: async (parent, { input }, context) => {
              if (context.user) {
                  const updatedUser = await User.findOneAndUpdate(
                      { _id: context.user._id },
                      { $addToSet: { savedBooks: input } },
                      { new : true, runValidators: true }
                  );
                  return updatedUser;
              }
              throw new AuthenticationError('You will need to log in to save a book!');
          },
          removeBook: async(parent, { bookId }, context) => {
              if (context.user) {
                  const updatedUser = await User.findOneAndUpdate(
                      { _id: context.user._id },
                      { $pull: { savedBooks: { bookId } } },
                      { new: true }
                  );
                  return updatedUser;
              }
              throw new AuthenticationError("You will need to be logged in to remove a book!");
          }
      }
  };
  
  module.exports = resolvers;