text: const { AuthenticationError } = require('apollo-server-express');
  const { User, Book } = require('../models');
  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 -password')
  
        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.findByIdAndUpdate(
            { _id: context.user._id },
            { $addToSet: { savedBooks: input } },
            { new: true }
          );
          return updatedUser;
        }
        throw new AuthenticationError('You need to be logged in!')
      },
  
      removeBook: async (parent, args, context) => {
        if (context.user) {
          const updatedUser = await User.findOneAndUpdate(
            { _id: context.user._id },
            { $pull: { savedBooks: { bookId: args.bookId } } },
            { new: true }
          );
          return updatedUser;
        }
        throw new AuthenticationError('You need to be logged in!')
      }
    }
  };
  
  module.exports = resolvers;